widget/gtk/nsWindow.cpp
author Doug Turner <doug.turner@gmail.com>
Tue, 03 Feb 2015 17:00:00 +0100
changeset 243715 840987c23fc597bdaad4567c2387ba1aa06c65d0
parent 243621 e32f606d51e3b6556750ab3e42edaa86d4d18f54
permissions -rw-r--r--
Bug 1045229 - Beacons are not associated with windows. The current window based filtering that the network monitor does will skip requests that come from sendBeacon(). Here we explictly look to see if the network channel is from beacon by looking at the loadinfo. r=dcamp, a=sledru

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:expandtab:shiftwidth=4:tabstop=4:
 */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/ArrayUtils.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/TextEvents.h"
#include <algorithm>

#include "prlink.h"
#include "nsGTKToolkit.h"
#include "nsIRollupListener.h"
#include "nsIDOMNode.h"

#include "nsWidgetsCID.h"
#include "nsDragService.h"
#include "nsIWidgetListener.h"

#include "nsGtkKeyUtils.h"
#include "nsGtkCursors.h"

#include <gtk/gtk.h>
#if (MOZ_WIDGET_GTK == 3)
#include <gtk/gtkx.h>
#endif
#ifdef MOZ_X11
#include <gdk/gdkx.h>
#include <X11/Xatom.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/shape.h>
#if (MOZ_WIDGET_GTK == 3)
#include <gdk/gdkkeysyms-compat.h>
#endif

#ifdef AIX
#include <X11/keysym.h>
#else
#include <X11/XF86keysym.h>
#endif

#if (MOZ_WIDGET_GTK == 2)
#include "gtk2xtbin.h"
#endif
#endif /* MOZ_X11 */
#include <gdk/gdkkeysyms.h>
#if (MOZ_WIDGET_GTK == 2)
#include <gtk/gtkprivate.h>
#endif

#include "nsGkAtoms.h"

#ifdef MOZ_ENABLE_STARTUP_NOTIFICATION
#define SN_API_NOT_YET_FROZEN
#include <startup-notification-1.0/libsn/sn.h>
#endif

#include "mozilla/Assertions.h"
#include "mozilla/Likely.h"
#include "mozilla/Preferences.h"
#include "nsIPrefService.h"
#include "nsIGConfService.h"
#include "nsIServiceManager.h"
#include "nsIStringBundle.h"
#include "nsGfxCIID.h"
#include "nsGtkUtils.h"
#include "nsIObserverService.h"
#include "mozilla/layers/LayersTypes.h"
#include "nsIIdleServiceInternal.h"
#include "nsIPropertyBag2.h"
#include "GLContext.h"
#include "gfx2DGlue.h"

#ifdef ACCESSIBILITY
#include "mozilla/a11y/Accessible.h"
#include "mozilla/a11y/Platform.h"
#include "nsAccessibilityService.h"

using namespace mozilla;
using namespace mozilla::widget;
#endif

/* For SetIcon */
#include "nsAppDirectoryServiceDefs.h"
#include "nsXPIDLString.h"
#include "nsIFile.h"

/* SetCursor(imgIContainer*) */
#include <gdk/gdk.h>
#include <wchar.h>
#include "imgIContainer.h"
#include "nsGfxCIID.h"
#include "nsImageToPixbuf.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsAutoPtr.h"
#include "ClientLayerManager.h"

extern "C" {
#define PIXMAN_DONT_DEFINE_STDINT
#include "pixman.h"
}
#include "gfxPlatformGtk.h"
#include "gfxContext.h"
#include "gfxImageSurface.h"
#include "gfxUtils.h"
#include "Layers.h"
#include "GLContextProvider.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/layers/CompositorParent.h"

#ifdef MOZ_X11
#include "gfxXlibSurface.h"
#include "cairo-xlib.h"
#endif
  
#include "nsShmImage.h"

#include "nsIDOMWheelEvent.h"

#include "NativeKeyBindings.h"
#include "nsWindow.h"

using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::widget;
using namespace mozilla::layers;
using mozilla::gl::GLContext;

// Don't put more than this many rects in the dirty region, just fluff
// out to the bounding-box if there are more
#define MAX_RECTS_IN_REGION 100

const gint kEvents = GDK_EXPOSURE_MASK | GDK_STRUCTURE_MASK |
                     GDK_VISIBILITY_NOTIFY_MASK |
                     GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK |
                     GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
#if GTK_CHECK_VERSION(3,4,0)
                     GDK_SMOOTH_SCROLL_MASK |
#endif
                     GDK_SCROLL_MASK |
                     GDK_POINTER_MOTION_MASK;

/* utility functions */
static bool       is_mouse_in_window(GdkWindow* aWindow,
                                     gdouble aMouseX, gdouble aMouseY);
static nsWindow  *get_window_for_gtk_widget(GtkWidget *widget);
static nsWindow  *get_window_for_gdk_window(GdkWindow *window);
static GtkWidget *get_gtk_widget_for_gdk_window(GdkWindow *window);
static GdkCursor *get_gtk_cursor(nsCursor aCursor);

static GdkWindow *get_inner_gdk_window (GdkWindow *aWindow,
                                        gint x, gint y,
                                        gint *retx, gint *rety);

static inline bool is_context_menu_key(const WidgetKeyboardEvent& inKeyEvent);

static int    is_parent_ungrab_enter(GdkEventCrossing *aEvent);
static int    is_parent_grab_leave(GdkEventCrossing *aEvent);

static void GetBrandName(nsXPIDLString& brandName);

/* callbacks from widgets */
#if (MOZ_WIDGET_GTK == 2)
static gboolean expose_event_cb           (GtkWidget *widget,
                                           GdkEventExpose *event);
#else
static gboolean expose_event_cb           (GtkWidget *widget,
                                           cairo_t *rect);
#endif
static gboolean configure_event_cb        (GtkWidget *widget,
                                           GdkEventConfigure *event);
static void     container_unrealize_cb    (GtkWidget *widget);
static void     size_allocate_cb          (GtkWidget *widget,
                                           GtkAllocation *allocation);
static gboolean delete_event_cb           (GtkWidget *widget,
                                           GdkEventAny *event);
static gboolean enter_notify_event_cb     (GtkWidget *widget,
                                           GdkEventCrossing *event);
static gboolean leave_notify_event_cb     (GtkWidget *widget,
                                           GdkEventCrossing *event);
static gboolean motion_notify_event_cb    (GtkWidget *widget,
                                           GdkEventMotion *event);
static gboolean button_press_event_cb     (GtkWidget *widget,
                                           GdkEventButton *event);
static gboolean button_release_event_cb   (GtkWidget *widget,
                                           GdkEventButton *event);
static gboolean focus_in_event_cb         (GtkWidget *widget,
                                           GdkEventFocus *event);
static gboolean focus_out_event_cb        (GtkWidget *widget,
                                           GdkEventFocus *event);
static gboolean key_press_event_cb        (GtkWidget *widget,
                                           GdkEventKey *event);
static gboolean key_release_event_cb      (GtkWidget *widget,
                                           GdkEventKey *event);
static gboolean scroll_event_cb           (GtkWidget *widget,
                                           GdkEventScroll *event);
static gboolean visibility_notify_event_cb(GtkWidget *widget,
                                           GdkEventVisibility *event);
static void     hierarchy_changed_cb      (GtkWidget *widget,
                                           GtkWidget *previous_toplevel);
static gboolean window_state_event_cb     (GtkWidget *widget,
                                           GdkEventWindowState *event);
static void     theme_changed_cb          (GtkSettings *settings,
                                           GParamSpec *pspec,
                                           nsWindow *data);
static nsWindow* GetFirstNSWindowForGDKWindow (GdkWindow *aGdkWindow);

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#ifdef MOZ_X11
static GdkFilterReturn popup_take_focus_filter (GdkXEvent *gdk_xevent,
                                                GdkEvent *event,
                                                gpointer data);
static GdkFilterReturn plugin_window_filter_func (GdkXEvent *gdk_xevent,
                                                  GdkEvent *event,
                                                  gpointer data);
static GdkFilterReturn plugin_client_message_filter (GdkXEvent *xevent,
                                                     GdkEvent *event,
                                                     gpointer data);
#endif /* MOZ_X11 */
#ifdef __cplusplus
}
#endif /* __cplusplus */

static gboolean drag_motion_event_cb      (GtkWidget *aWidget,
                                           GdkDragContext *aDragContext,
                                           gint aX,
                                           gint aY,
                                           guint aTime,
                                           gpointer aData);
static void     drag_leave_event_cb       (GtkWidget *aWidget,
                                           GdkDragContext *aDragContext,
                                           guint aTime,
                                           gpointer aData);
static gboolean drag_drop_event_cb        (GtkWidget *aWidget,
                                           GdkDragContext *aDragContext,
                                           gint aX,
                                           gint aY,
                                           guint aTime,
                                           gpointer aData);
static void    drag_data_received_event_cb(GtkWidget *aWidget,
                                           GdkDragContext *aDragContext,
                                           gint aX,
                                           gint aY,
                                           GtkSelectionData  *aSelectionData,
                                           guint aInfo,
                                           guint32 aTime,
                                           gpointer aData);

/* initialization static functions */
static nsresult    initialize_prefs        (void);

static guint32 sLastUserInputTime = GDK_CURRENT_TIME;
static guint32 sRetryGrabTime;

static NS_DEFINE_IID(kCDragServiceCID,  NS_DRAGSERVICE_CID);

// The window from which the focus manager asks us to dispatch key events.
static nsWindow         *gFocusWindow          = nullptr;
static bool              gBlockActivateEvent   = false;
static bool              gGlobalsInitialized   = false;
static bool              gRaiseWindows         = true;
static nsWindow         *gPluginFocusWindow    = nullptr;


#define NS_WINDOW_TITLE_MAX_LENGTH 4095

// If after selecting profile window, the startup fail, please refer to
// http://bugzilla.gnome.org/show_bug.cgi?id=88940

// needed for imgIContainer cursors
// GdkDisplay* was added in 2.2
typedef struct _GdkDisplay GdkDisplay;

#define kWindowPositionSlop 20

// cursor cache
static GdkCursor *gCursorCache[eCursorCount];

static GtkWidget *gInvisibleContainer = nullptr;

// Sometimes this actually also includes the state of the modifier keys, but
// only the button state bits are used.
static guint gButtonState;

// nsAutoRef<pixman_region32> uses nsSimpleRef<> to know how to automatically
// destroy regions.
template <>
class nsSimpleRef<pixman_region32> : public pixman_region32 {
protected:
    typedef pixman_region32 RawRef;

    nsSimpleRef() { data = nullptr; }
    explicit nsSimpleRef(const RawRef &aRawRef) : pixman_region32(aRawRef) { }

    static void Release(pixman_region32& region) {
        pixman_region32_fini(&region);
    }
    // Whether this needs to be released:
    bool HaveResource() const { return data != nullptr; }

    pixman_region32& get() { return *this; }
};

static inline int32_t
GetBitmapStride(int32_t width)
{
#if defined(MOZ_X11) || (MOZ_WIDGET_GTK == 2)
  return (width+7)/8;
#else
  return cairo_format_stride_for_width(CAIRO_FORMAT_A1, width);
#endif
}

static inline bool TimestampIsNewerThan(guint32 a, guint32 b)
{
    // Timestamps are just the least significant bits of a monotonically
    // increasing function, and so the use of unsigned overflow arithmetic.
    return a - b <= G_MAXUINT32/2;
}

static void
UpdateLastInputEventTime(void *aGdkEvent)
{
    nsCOMPtr<nsIIdleServiceInternal> idleService =
        do_GetService("@mozilla.org/widget/idleservice;1");
    if (idleService) {
        idleService->ResetIdleTimeOut(0);
    }

    guint timestamp = gdk_event_get_time(static_cast<GdkEvent*>(aGdkEvent));
    if (timestamp == GDK_CURRENT_TIME)
        return;

    sLastUserInputTime = timestamp;
}

nsWindow::nsWindow()
{
    mIsTopLevel       = false;
    mIsDestroyed      = false;
    mNeedsResize      = false;
    mNeedsMove        = false;
    mListenForResizes = false;
    mIsShown          = false;
    mNeedsShow        = false;
    mEnabled          = true;
    mCreated          = false;

    mContainer           = nullptr;
    mGdkWindow           = nullptr;
    mShell               = nullptr;
    mHasMappedToplevel   = false;
    mIsFullyObscured     = false;
    mRetryPointerGrab    = false;
    mWindowType          = eWindowType_child;
    mSizeState           = nsSizeMode_Normal;
    mLastSizeMode        = nsSizeMode_Normal;
    mSizeConstraints.mMaxSize = GetSafeWindowSize(mSizeConstraints.mMaxSize);

#ifdef MOZ_X11
    mOldFocusWindow      = 0;
#endif /* MOZ_X11 */
    mPluginType          = PluginType_NONE;

    if (!gGlobalsInitialized) {
        gGlobalsInitialized = true;

        // It's OK if either of these fail, but it may not be one day.
        initialize_prefs();
    }

    mLastMotionPressure = 0;

#ifdef ACCESSIBILITY
    mRootAccessible  = nullptr;
#endif

    mIsTransparent = false;
    mTransparencyBitmap = nullptr;

    mTransparencyBitmapWidth  = 0;
    mTransparencyBitmapHeight = 0;

#if GTK_CHECK_VERSION(3,4,0)
    mLastScrollEventTime = GDK_CURRENT_TIME;
#endif
}

nsWindow::~nsWindow()
{
    LOG(("nsWindow::~nsWindow() [%p]\n", (void *)this));

    delete[] mTransparencyBitmap;
    mTransparencyBitmap = nullptr;

    Destroy();
}

/* static */ void
nsWindow::ReleaseGlobals()
{
  for (uint32_t i = 0; i < ArrayLength(gCursorCache); ++i) {
    if (gCursorCache[i]) {
#if (MOZ_WIDGET_GTK == 3)
      g_object_unref(gCursorCache[i]);
#else
      gdk_cursor_unref(gCursorCache[i]);
#endif
      gCursorCache[i] = nullptr;
    }
  }
}

NS_IMPL_ISUPPORTS_INHERITED(nsWindow, nsBaseWidget,
                            nsISupportsWeakReference)

void
nsWindow::CommonCreate(nsIWidget *aParent, bool aListenForResizes)
{
    mParent = aParent;
    mListenForResizes = aListenForResizes;
    mCreated = true;
}

void
nsWindow::DispatchActivateEvent(void)
{
    NS_ASSERTION(mContainer || mIsDestroyed,
                 "DispatchActivateEvent only intended for container windows");

#ifdef ACCESSIBILITY
    DispatchActivateEventAccessible();
#endif //ACCESSIBILITY

    if (mWidgetListener)
      mWidgetListener->WindowActivated();
}

void
nsWindow::DispatchDeactivateEvent(void)
{
    if (mWidgetListener)
      mWidgetListener->WindowDeactivated();

#ifdef ACCESSIBILITY
    DispatchDeactivateEventAccessible();
#endif //ACCESSIBILITY
}

void
nsWindow::DispatchResized(int32_t aWidth, int32_t aHeight)
{
    nsIWidgetListener *listeners[] =
        { mWidgetListener, mAttachedWidgetListener };
    for (size_t i = 0; i < ArrayLength(listeners); ++i) {
        if (listeners[i]) {
            listeners[i]->WindowResized(this, aWidth, aHeight);
        }
    }
}

nsresult
nsWindow::DispatchEvent(WidgetGUIEvent* aEvent, nsEventStatus& aStatus)
{
#ifdef DEBUG
    debug_DumpEvent(stdout, aEvent->widget, aEvent,
                    nsAutoCString("something"), 0);
#endif

    aStatus = nsEventStatus_eIgnore;
    nsIWidgetListener* listener =
        mAttachedWidgetListener ? mAttachedWidgetListener : mWidgetListener;
    if (listener) {
      aStatus = listener->HandleEvent(aEvent, mUseAttachedEvents);
    }

    return NS_OK;
}

void
nsWindow::OnDestroy(void)
{
    if (mOnDestroyCalled)
        return;

    mOnDestroyCalled = true;
    
    // Prevent deletion.
    nsCOMPtr<nsIWidget> kungFuDeathGrip = this;

    // release references to children, device context, toolkit + app shell
    nsBaseWidget::OnDestroy(); 
    
    // Remove association between this object and its parent and siblings.
    nsBaseWidget::Destroy();
    mParent = nullptr;

    NotifyWindowDestroyed();
}

bool
nsWindow::AreBoundsSane(void)
{
    if (mBounds.width > 0 && mBounds.height > 0)
        return true;

    return false;
}

static GtkWidget*
EnsureInvisibleContainer()
{
    if (!gInvisibleContainer) {
        // GtkWidgets need to be anchored to a GtkWindow to be realized (to
        // have a window).  Using GTK_WINDOW_POPUP rather than
        // GTK_WINDOW_TOPLEVEL in the hope that POPUP results in less
        // initialization and window manager interaction.
        GtkWidget* window = gtk_window_new(GTK_WINDOW_POPUP);
        gInvisibleContainer = moz_container_new();
        gtk_container_add(GTK_CONTAINER(window), gInvisibleContainer);
        gtk_widget_realize(gInvisibleContainer);

    }
    return gInvisibleContainer;
}

static void
CheckDestroyInvisibleContainer()
{
    NS_PRECONDITION(gInvisibleContainer, "oh, no");

    if (!gdk_window_peek_children(gtk_widget_get_window(gInvisibleContainer))) {
        // No children, so not in use.
        // Make sure to destroy the GtkWindow also.
        gtk_widget_destroy(gtk_widget_get_parent(gInvisibleContainer));
        gInvisibleContainer = nullptr;
    }
}

// Change the containing GtkWidget on a sub-hierarchy of GdkWindows belonging
// to aOldWidget and rooted at aWindow, and reparent any child GtkWidgets of
// the GdkWindow hierarchy to aNewWidget.
static void
SetWidgetForHierarchy(GdkWindow *aWindow,
                      GtkWidget *aOldWidget,
                      GtkWidget *aNewWidget)
{
    gpointer data;
    gdk_window_get_user_data(aWindow, &data);

    if (data != aOldWidget) {
        if (!GTK_IS_WIDGET(data))
            return;

        GtkWidget* widget = static_cast<GtkWidget*>(data);
        if (gtk_widget_get_parent(widget) != aOldWidget)
            return;

        // This window belongs to a child widget, which will no longer be a
        // child of aOldWidget.
        gtk_widget_reparent(widget, aNewWidget);

        return;
    }

    GList *children = gdk_window_get_children(aWindow);
    for(GList *list = children; list; list = list->next) {
        SetWidgetForHierarchy(GDK_WINDOW(list->data), aOldWidget, aNewWidget);
    }
    g_list_free(children);

    gdk_window_set_user_data(aWindow, aNewWidget);
}

// Walk the list of child windows and call destroy on them.
void
nsWindow::DestroyChildWindows()
{
    if (!mGdkWindow)
        return;

    while (GList *children = gdk_window_peek_children(mGdkWindow)) {
        GdkWindow *child = GDK_WINDOW(children->data);
        nsWindow *kid = get_window_for_gdk_window(child);
        if (kid) {
            kid->Destroy();
        } else {
            // This child is not an nsWindow.
            // Destroy the child GtkWidget.
            gpointer data;
            gdk_window_get_user_data(child, &data);
            if (GTK_IS_WIDGET(data)) {
                gtk_widget_destroy(static_cast<GtkWidget*>(data));
            }
        }
    }
}

NS_IMETHODIMP
nsWindow::Destroy(void)
{
    if (mIsDestroyed || !mCreated)
        return NS_OK;

    LOG(("nsWindow::Destroy [%p]\n", (void *)this));
    mIsDestroyed = true;
    mCreated = false;

    /** Need to clean our LayerManager up while still alive */
    if (mLayerManager) {
        mLayerManager->Destroy();
    }
    mLayerManager = nullptr;

    // It is safe to call DestroyeCompositor several times (here and 
    // in the parent class) since it will take effect only once.
    // The reason we call it here is because on gtk platforms we need 
    // to destroy the compositor before we destroy the gdk window (which
    // destroys the the gl context attached to it).
    DestroyCompositor();

    ClearCachedResources();

    g_signal_handlers_disconnect_by_func(gtk_settings_get_default(),
                                         FuncToGpointer(theme_changed_cb),
                                         this);

    nsIRollupListener* rollupListener = nsBaseWidget::GetActiveRollupListener();
    if (rollupListener) {
        nsCOMPtr<nsIWidget> rollupWidget = rollupListener->GetRollupWidget();
        if (static_cast<nsIWidget *>(this) == rollupWidget) {
            rollupListener->Rollup(0, nullptr, nullptr);
        }
    }

    // dragService will be null after shutdown of the service manager.
    nsDragService *dragService = nsDragService::GetInstance();
    if (dragService && this == dragService->GetMostRecentDestWindow()) {
        dragService->ScheduleLeaveEvent();
    }

    NativeShow(false);

    if (mIMModule) {
        mIMModule->OnDestroyWindow(this);
    }

    // make sure that we remove ourself as the focus window
    if (gFocusWindow == this) {
        LOGFOCUS(("automatically losing focus...\n"));
        gFocusWindow = nullptr;
    }

#if (MOZ_WIDGET_GTK == 2) && defined(MOZ_X11)
    // make sure that we remove ourself as the plugin focus window
    if (gPluginFocusWindow == this) {
        gPluginFocusWindow->LoseNonXEmbedPluginFocus();
    }
#endif /* MOZ_X11 && MOZ_WIDGET_GTK2 */
  
    // Destroy thebes surface now. Badness can happen if we destroy
    // the surface after its X Window.
    mThebesSurface = nullptr;

    GtkWidget *owningWidget = GetMozContainerWidget();
    if (mShell) {
        gtk_widget_destroy(mShell);
        mShell = nullptr;
        mContainer = nullptr;
        NS_ABORT_IF_FALSE(!mGdkWindow,
                          "mGdkWindow should be NULL when mContainer is destroyed");
    }
    else if (mContainer) {
        gtk_widget_destroy(GTK_WIDGET(mContainer));
        mContainer = nullptr;
        NS_ABORT_IF_FALSE(!mGdkWindow,
                          "mGdkWindow should be NULL when mContainer is destroyed");
    }
    else if (mGdkWindow) {
        // Destroy child windows to ensure that their mThebesSurfaces are
        // released and to remove references from GdkWindows back to their
        // container widget.  (OnContainerUnrealize() does this when the
        // MozContainer widget is destroyed.)
        DestroyChildWindows();

        gdk_window_set_user_data(mGdkWindow, nullptr);
        g_object_set_data(G_OBJECT(mGdkWindow), "nsWindow", nullptr);
        gdk_window_destroy(mGdkWindow);
        mGdkWindow = nullptr;
    }

    if (gInvisibleContainer && owningWidget == gInvisibleContainer) {
        CheckDestroyInvisibleContainer();
    }

#ifdef ACCESSIBILITY
     if (mRootAccessible) {
         mRootAccessible = nullptr;
     }
#endif

    // Save until last because OnDestroy() may cause us to be deleted.
    OnDestroy();

    return NS_OK;
}

nsIWidget *
nsWindow::GetParent(void)
{
    return mParent;
}

float
nsWindow::GetDPI()
{
    Display *dpy = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
    int defaultScreen = DefaultScreen(dpy);
    double heightInches = DisplayHeightMM(dpy, defaultScreen)/MM_PER_INCH_FLOAT;
    if (heightInches < 0.25) {
        // Something's broken, but we'd better not crash.
        return 96.0f;
    }
    return float(DisplayHeight(dpy, defaultScreen)/heightInches);
}

NS_IMETHODIMP
nsWindow::SetParent(nsIWidget *aNewParent)
{
    if (mContainer || !mGdkWindow) {
        NS_NOTREACHED("nsWindow::SetParent called illegally");
        return NS_ERROR_NOT_IMPLEMENTED;
    }

    nsCOMPtr<nsIWidget> kungFuDeathGrip = this;
    if (mParent) {
        mParent->RemoveChild(this);
    }

    mParent = aNewParent;

    GtkWidget* oldContainer = GetMozContainerWidget();
    if (!oldContainer) {
        // The GdkWindows have been destroyed so there is nothing else to
        // reparent.
        NS_ABORT_IF_FALSE(gdk_window_is_destroyed(mGdkWindow),
                          "live GdkWindow with no widget");
        return NS_OK;
    }

    if (aNewParent) {
        aNewParent->AddChild(this);
        ReparentNativeWidget(aNewParent);
    } else {
        // aNewParent is nullptr, but reparent to a hidden window to avoid
        // destroying the GdkWindow and its descendants.
        // An invisible container widget is needed to hold descendant
        // GtkWidgets.
        GtkWidget* newContainer = EnsureInvisibleContainer();
        GdkWindow* newParentWindow = gtk_widget_get_window(newContainer);
        ReparentNativeWidgetInternal(aNewParent, newContainer, newParentWindow,
                                     oldContainer);
    }
    return NS_OK;
}

NS_IMETHODIMP
nsWindow::ReparentNativeWidget(nsIWidget* aNewParent)
{
    NS_PRECONDITION(aNewParent, "");
    NS_ASSERTION(!mIsDestroyed, "");
    NS_ASSERTION(!static_cast<nsWindow*>(aNewParent)->mIsDestroyed, "");

    GtkWidget* oldContainer = GetMozContainerWidget();
    if (!oldContainer) {
        // The GdkWindows have been destroyed so there is nothing else to
        // reparent.
        NS_ABORT_IF_FALSE(gdk_window_is_destroyed(mGdkWindow),
                          "live GdkWindow with no widget");
        return NS_OK;
    }
    NS_ABORT_IF_FALSE(!gdk_window_is_destroyed(mGdkWindow),
                      "destroyed GdkWindow with widget");
    
    nsWindow* newParent = static_cast<nsWindow*>(aNewParent);
    GdkWindow* newParentWindow = newParent->mGdkWindow;
    GtkWidget* newContainer = newParent->GetMozContainerWidget();
    GtkWindow* shell = GTK_WINDOW(mShell);

    if (shell && gtk_window_get_transient_for(shell)) {
      GtkWindow* topLevelParent =
          GTK_WINDOW(gtk_widget_get_toplevel(newContainer));
      gtk_window_set_transient_for(shell, topLevelParent);
    }

    ReparentNativeWidgetInternal(aNewParent, newContainer, newParentWindow,
                                 oldContainer);
    return NS_OK;
}

void
nsWindow::ReparentNativeWidgetInternal(nsIWidget* aNewParent,
                                       GtkWidget* aNewContainer,
                                       GdkWindow* aNewParentWindow,
                                       GtkWidget* aOldContainer)
{
    if (!aNewContainer) {
        // The new parent GdkWindow has been destroyed.
        NS_ABORT_IF_FALSE(!aNewParentWindow ||
                          gdk_window_is_destroyed(aNewParentWindow),
                          "live GdkWindow with no widget");
        Destroy();
    } else {
        if (aNewContainer != aOldContainer) {
            NS_ABORT_IF_FALSE(!gdk_window_is_destroyed(aNewParentWindow),
                              "destroyed GdkWindow with widget");
            SetWidgetForHierarchy(mGdkWindow, aOldContainer, aNewContainer);

            if (aOldContainer == gInvisibleContainer) {
                CheckDestroyInvisibleContainer();
            }
        }

        if (!mIsTopLevel) {
            gdk_window_reparent(mGdkWindow, aNewParentWindow, mBounds.x,
                                mBounds.y);
        }
    }

    nsWindow* newParent = static_cast<nsWindow*>(aNewParent);
    bool parentHasMappedToplevel =
        newParent && newParent->mHasMappedToplevel;
    if (mHasMappedToplevel != parentHasMappedToplevel) {
        SetHasMappedToplevel(parentHasMappedToplevel);
    }
}

NS_IMETHODIMP
nsWindow::SetModal(bool aModal)
{
    LOG(("nsWindow::SetModal [%p] %d\n", (void *)this, aModal));
    if (mIsDestroyed)
        return aModal ? NS_ERROR_NOT_AVAILABLE : NS_OK;
    if (!mIsTopLevel || !mShell)
        return NS_ERROR_FAILURE;
    gtk_window_set_modal(GTK_WINDOW(mShell), aModal ? TRUE : FALSE);
    return NS_OK;
}

// nsIWidget method, which means IsShown.
bool
nsWindow::IsVisible() const
{
    return mIsShown;
}

NS_IMETHODIMP
nsWindow::ConstrainPosition(bool aAllowSlop, int32_t *aX, int32_t *aY)
{
    if (mIsTopLevel && mShell) {
        int32_t screenWidth = gdk_screen_width();
        int32_t screenHeight = gdk_screen_height();
        if (aAllowSlop) {
            if (*aX < (kWindowPositionSlop - mBounds.width))
                *aX = kWindowPositionSlop - mBounds.width;
            if (*aX > (screenWidth - kWindowPositionSlop))
                *aX = screenWidth - kWindowPositionSlop;
            if (*aY < (kWindowPositionSlop - mBounds.height))
                *aY = kWindowPositionSlop - mBounds.height;
            if (*aY > (screenHeight - kWindowPositionSlop))
                *aY = screenHeight - kWindowPositionSlop;
        } else {
            if (*aX < 0)
                *aX = 0;
            if (*aX > (screenWidth - mBounds.width))
                *aX = screenWidth - mBounds.width;
            if (*aY < 0)
                *aY = 0;
            if (*aY > (screenHeight - mBounds.height))
                *aY = screenHeight - mBounds.height;
        }
    }
    return NS_OK;
}

void nsWindow::SetSizeConstraints(const SizeConstraints& aConstraints)
{
    mSizeConstraints.mMinSize = GetSafeWindowSize(aConstraints.mMinSize);
    mSizeConstraints.mMaxSize = GetSafeWindowSize(aConstraints.mMaxSize);

    if (mShell) {
        GdkGeometry geometry;
        geometry.min_width = mSizeConstraints.mMinSize.width;
        geometry.min_height = mSizeConstraints.mMinSize.height;
        geometry.max_width = mSizeConstraints.mMaxSize.width;
        geometry.max_height = mSizeConstraints.mMaxSize.height;

        uint32_t hints = GDK_HINT_MIN_SIZE | GDK_HINT_MAX_SIZE;
        gtk_window_set_geometry_hints(GTK_WINDOW(mShell), nullptr,
                                      &geometry, GdkWindowHints(hints));
    }
}

NS_IMETHODIMP
nsWindow::Show(bool aState)
{
    if (aState == mIsShown)
        return NS_OK;

    // Clear our cached resources when the window is hidden.
    if (mIsShown && !aState) {
        ClearCachedResources();
    }

    mIsShown = aState;

    LOG(("nsWindow::Show [%p] state %d\n", (void *)this, aState));

    if (aState) {
        // Now that this window is shown, mHasMappedToplevel needs to be
        // tracked on viewable descendants.
        SetHasMappedToplevel(mHasMappedToplevel);
    }

    // Ok, someone called show on a window that isn't sized to a sane
    // value.  Mark this window as needing to have Show() called on it
    // and return.
    if ((aState && !AreBoundsSane()) || !mCreated) {
        LOG(("\tbounds are insane or window hasn't been created yet\n"));
        mNeedsShow = true;
        return NS_OK;
    }

    // If someone is hiding this widget, clear any needing show flag.
    if (!aState)
        mNeedsShow = false;

    // If someone is showing this window and it needs a resize then
    // resize the widget.
    if (aState) {
        if (mNeedsMove) {
            NativeResize(mBounds.x, mBounds.y, mBounds.width, mBounds.height,
                         false);
        } else if (mNeedsResize) {
            NativeResize(mBounds.width, mBounds.height, false);
        }
    }

#ifdef ACCESSIBILITY
    if (aState && a11y::ShouldA11yBeEnabled())
        CreateRootAccessible();
#endif

    NativeShow(aState);

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::Resize(double aWidth, double aHeight, bool aRepaint)
{
    CSSToLayoutDeviceScale scale = BoundsUseDisplayPixels() ? GetDefaultScale()
                                    : CSSToLayoutDeviceScale(1.0);
    int32_t width = NSToIntRound(scale.scale * aWidth);
    int32_t height = NSToIntRound(scale.scale * aHeight);
    ConstrainSize(&width, &height);

    // For top-level windows, aWidth and aHeight should possibly be
    // interpreted as frame bounds, but NativeResize treats these as window
    // bounds (Bug 581866).

    mBounds.SizeTo(width, height);

    if (!mCreated)
        return NS_OK;

    // There are several cases here that we need to handle, based on a
    // matrix of the visibility of the widget, the sanity of this resize
    // and whether or not the widget was previously sane.

    // Has this widget been set to visible?
    if (mIsShown) {
        // Are the bounds sane?
        if (AreBoundsSane()) {
            // Yep?  Resize the window
            //Maybe, the toplevel has moved

            // Note that if the widget needs to be positioned because its
            // size was previously insane in Resize(x,y,w,h), then we need
            // to set the x and y here too, because the widget wasn't
            // moved back then
            if (mNeedsMove)
                NativeResize(mBounds.x, mBounds.y,
                             mBounds.width, mBounds.height, aRepaint);
            else
                NativeResize(mBounds.width, mBounds.height, aRepaint);

            // Does it need to be shown because it was previously insane?
            if (mNeedsShow)
                NativeShow(true);
        }
        else {
            // If someone has set this so that the needs show flag is false
            // and it needs to be hidden, update the flag and hide the
            // window.  This flag will be cleared the next time someone
            // hides the window or shows it.  It also prevents us from
            // calling NativeShow(false) excessively on the window which
            // causes unneeded X traffic.
            if (!mNeedsShow) {
                mNeedsShow = true;
                NativeShow(false);
            }
        }
    }
    // If the widget hasn't been shown, mark the widget as needing to be
    // resized before it is shown.
    else {
        if (AreBoundsSane() && mListenForResizes) {
            // For widgets that we listen for resizes for (widgets created
            // with native parents) we apparently _always_ have to resize.  I
            // dunno why, but apparently we're lame like that.
            NativeResize(width, height, aRepaint);
        }
        else {
            mNeedsResize = true;
        }
    }

    NotifyRollupGeometryChange();

    // send a resize notification if this is a toplevel
    if (mIsTopLevel || mListenForResizes) {
        DispatchResized(width, height);
    }

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::Resize(double aX, double aY, double aWidth, double aHeight,
                 bool aRepaint)
{
    CSSToLayoutDeviceScale scale = BoundsUseDisplayPixels() ? GetDefaultScale()
                                    : CSSToLayoutDeviceScale(1.0);
    int32_t width = NSToIntRound(scale.scale * aWidth);
    int32_t height = NSToIntRound(scale.scale * aHeight);
    ConstrainSize(&width, &height);

    int32_t x = NSToIntRound(scale.scale * aX);
    int32_t y = NSToIntRound(scale.scale * aY);
    mBounds.x = x;
    mBounds.y = y;
    mBounds.SizeTo(width, height);

    mNeedsMove = true;

    if (!mCreated)
        return NS_OK;

    // There are several cases here that we need to handle, based on a
    // matrix of the visibility of the widget, the sanity of this resize
    // and whether or not the widget was previously sane.

    // Has this widget been set to visible?
    if (mIsShown) {
        // Are the bounds sane?
        if (AreBoundsSane()) {
            // Yep?  Resize the window
            NativeResize(x, y, width, height, aRepaint);
            // Does it need to be shown because it was previously insane?
            if (mNeedsShow)
                NativeShow(true);
        }
        else {
            // If someone has set this so that the needs show flag is false
            // and it needs to be hidden, update the flag and hide the
            // window.  This flag will be cleared the next time someone
            // hides the window or shows it.  It also prevents us from
            // calling NativeShow(false) excessively on the window which
            // causes unneeded X traffic.
            if (!mNeedsShow) {
                mNeedsShow = true;
                NativeShow(false);
            }
        }
    }
    // If the widget hasn't been shown, mark the widget as needing to be
    // resized before it is shown
    else {
        if (AreBoundsSane() && mListenForResizes){
            // For widgets that we listen for resizes for (widgets created
            // with native parents) we apparently _always_ have to resize.  I
            // dunno why, but apparently we're lame like that.
            NativeResize(x, y, width, height, aRepaint);
        }
        else {
            mNeedsResize = true;
        }
    }

    NotifyRollupGeometryChange();

    if (mIsTopLevel || mListenForResizes) {
        DispatchResized(width, height);
    }

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::Enable(bool aState)
{
    mEnabled = aState;

    return NS_OK;
}

bool
nsWindow::IsEnabled() const
{
    return mEnabled;
}



NS_IMETHODIMP
nsWindow::Move(double aX, double aY)
{
    LOG(("nsWindow::Move [%p] %f %f\n", (void *)this,
         aX, aY));

    CSSToLayoutDeviceScale scale = BoundsUseDisplayPixels() ? GetDefaultScale()
                                   : CSSToLayoutDeviceScale(1.0);
    int32_t x = NSToIntRound(aX * scale.scale);
    int32_t y = NSToIntRound(aY * scale.scale);

    if (mWindowType == eWindowType_toplevel ||
        mWindowType == eWindowType_dialog) {
        SetSizeMode(nsSizeMode_Normal);
    }

    // Since a popup window's x/y coordinates are in relation to to
    // the parent, the parent might have moved so we always move a
    // popup window.
    if (x == mBounds.x && y == mBounds.y &&
        mWindowType != eWindowType_popup)
        return NS_OK;

    // XXX Should we do some AreBoundsSane check here?

    mBounds.x = x;
    mBounds.y = y;

    if (!mCreated)
        return NS_OK;

    mNeedsMove = false;

    if (mIsTopLevel) {
        gtk_window_move(GTK_WINDOW(mShell), x, y);
    }
    else if (mGdkWindow) {
        gdk_window_move(mGdkWindow, x, y);
    }

    NotifyRollupGeometryChange();
    return NS_OK;
}

NS_IMETHODIMP
nsWindow::PlaceBehind(nsTopLevelWidgetZPlacement  aPlacement,
                      nsIWidget                  *aWidget,
                      bool                        aActivate)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

void
nsWindow::SetZIndex(int32_t aZIndex)
{
    nsIWidget* oldPrev = GetPrevSibling();

    nsBaseWidget::SetZIndex(aZIndex);

    if (GetPrevSibling() == oldPrev) {
        return;
    }

    NS_ASSERTION(!mContainer, "Expected Mozilla child widget");

    // We skip the nsWindows that don't have mGdkWindows.
    // These are probably in the process of being destroyed.

    if (!GetNextSibling()) {
        // We're to be on top.
        if (mGdkWindow)
            gdk_window_raise(mGdkWindow);
    } else {
        // All the siblings before us need to be below our widget.
        for (nsWindow* w = this; w;
             w = static_cast<nsWindow*>(w->GetPrevSibling())) {
            if (w->mGdkWindow)
                gdk_window_lower(w->mGdkWindow);
        }
    }
}

NS_IMETHODIMP
nsWindow::SetSizeMode(int32_t aMode)
{
    nsresult rv;

    LOG(("nsWindow::SetSizeMode [%p] %d\n", (void *)this, aMode));

    // Save the requested state.
    rv = nsBaseWidget::SetSizeMode(aMode);

    // return if there's no shell or our current state is the same as
    // the mode we were just set to.
    if (!mShell || mSizeState == mSizeMode) {
        return rv;
    }

    switch (aMode) {
    case nsSizeMode_Maximized:
        gtk_window_maximize(GTK_WINDOW(mShell));
        break;
    case nsSizeMode_Minimized:
        gtk_window_iconify(GTK_WINDOW(mShell));
        break;
    case nsSizeMode_Fullscreen:
        MakeFullScreen(true);
        break;

    default:
        // nsSizeMode_Normal, really.
        if (mSizeState == nsSizeMode_Minimized)
            gtk_window_deiconify(GTK_WINDOW(mShell));
        else if (mSizeState == nsSizeMode_Maximized)
            gtk_window_unmaximize(GTK_WINDOW(mShell));
        break;
    }

    mSizeState = mSizeMode;

    return rv;
}

typedef void (* SetUserTimeFunc)(GdkWindow* aWindow, guint32 aTimestamp);

// This will become obsolete when new GTK APIs are widely supported,
// as described here: http://bugzilla.gnome.org/show_bug.cgi?id=347375
static void
SetUserTimeAndStartupIDForActivatedWindow(GtkWidget* aWindow)
{
    nsGTKToolkit* GTKToolkit = nsGTKToolkit::GetToolkit();
    if (!GTKToolkit)
        return;

    nsAutoCString desktopStartupID;
    GTKToolkit->GetDesktopStartupID(&desktopStartupID);
    if (desktopStartupID.IsEmpty()) {
        // We don't have the data we need. Fall back to an
        // approximation ... using the timestamp of the remote command
        // being received as a guess for the timestamp of the user event
        // that triggered it.
        uint32_t timestamp = GTKToolkit->GetFocusTimestamp();
        if (timestamp) {
            gdk_window_focus(gtk_widget_get_window(aWindow), timestamp);
            GTKToolkit->SetFocusTimestamp(0);
        }
        return;
    }

#if defined(MOZ_ENABLE_STARTUP_NOTIFICATION)
    GdkWindow* gdkWindow = gtk_widget_get_window(aWindow);
  
    GdkScreen* screen = gdk_window_get_screen(gdkWindow);
    SnDisplay* snd =
        sn_display_new(gdk_x11_display_get_xdisplay(gdk_window_get_display(gdkWindow)), 
                       nullptr, nullptr);
    if (!snd)
        return;
    SnLauncheeContext* ctx =
        sn_launchee_context_new(snd, gdk_screen_get_number(screen),
                                desktopStartupID.get());
    if (!ctx) {
        sn_display_unref(snd);
        return;
    }

    if (sn_launchee_context_get_id_has_timestamp(ctx)) {
        gdk_x11_window_set_user_time(gdkWindow, sn_launchee_context_get_timestamp(ctx));
    }

    sn_launchee_context_setup_window(ctx, gdk_x11_window_get_xid(gdkWindow));
    sn_launchee_context_complete(ctx);

    sn_launchee_context_unref(ctx);
    sn_display_unref(snd);
#endif

    // If we used the startup ID, that already contains the focus timestamp;
    // we don't want to reuse the timestamp next time we raise the window
    GTKToolkit->SetFocusTimestamp(0);
    GTKToolkit->SetDesktopStartupID(EmptyCString());
}

/* static */ guint32
nsWindow::GetLastUserInputTime()
{
    // gdk_x11_display_get_user_time tracks button and key presses,
    // DESKTOP_STARTUP_ID used to start the app, drop events from external
    // drags, WM_DELETE_WINDOW delete events, but not usually mouse motion nor
    // button and key releases.  Therefore use the most recent of
    // gdk_x11_display_get_user_time and the last time that we have seen.
    guint32 timestamp =
            gdk_x11_display_get_user_time(gdk_display_get_default());
    if (sLastUserInputTime != GDK_CURRENT_TIME &&
        TimestampIsNewerThan(sLastUserInputTime, timestamp)) {
        return sLastUserInputTime;
    }       

    return timestamp;
}

NS_IMETHODIMP
nsWindow::SetFocus(bool aRaise)
{
    // Make sure that our owning widget has focus.  If it doesn't try to
    // grab it.  Note that we don't set our focus flag in this case.

    LOGFOCUS(("  SetFocus %d [%p]\n", aRaise, (void *)this));

    GtkWidget *owningWidget = GetMozContainerWidget();
    if (!owningWidget)
        return NS_ERROR_FAILURE;

    // Raise the window if someone passed in true and the prefs are
    // set properly.
    GtkWidget *toplevelWidget = gtk_widget_get_toplevel(owningWidget);

    if (gRaiseWindows && aRaise && toplevelWidget &&
        !gtk_widget_has_focus(owningWidget) &&
        !gtk_widget_has_focus(toplevelWidget)) {
        GtkWidget* top_window = GetToplevelWidget();
        if (top_window && (gtk_widget_get_visible(top_window)))
        {
            gdk_window_show_unraised(gtk_widget_get_window(top_window));
            // Unset the urgency hint if possible.
            SetUrgencyHint(top_window, false);
        }
    }

    nsRefPtr<nsWindow> owningWindow = get_window_for_gtk_widget(owningWidget);
    if (!owningWindow)
        return NS_ERROR_FAILURE;

    if (aRaise) {
        // aRaise == true means request toplevel activation.

        // This is asynchronous.
        // If and when the window manager accepts the request, then the focus
        // widget will get a focus-in-event signal.
        if (gRaiseWindows && owningWindow->mIsShown && owningWindow->mShell &&
            !gtk_window_is_active(GTK_WINDOW(owningWindow->mShell))) {

            uint32_t timestamp = GDK_CURRENT_TIME;

            nsGTKToolkit* GTKToolkit = nsGTKToolkit::GetToolkit();
            if (GTKToolkit)
                timestamp = GTKToolkit->GetFocusTimestamp();

            LOGFOCUS(("  requesting toplevel activation [%p]\n", (void *)this));
            NS_ASSERTION(owningWindow->mWindowType != eWindowType_popup
                         || mParent,
                         "Presenting an override-redirect window");
            gtk_window_present_with_time(GTK_WINDOW(owningWindow->mShell), timestamp);

            if (GTKToolkit)
                GTKToolkit->SetFocusTimestamp(0);
        }

        return NS_OK;
    }

    // aRaise == false means that keyboard events should be dispatched
    // from this widget.

    // Ensure owningWidget is the focused GtkWidget within its toplevel window.
    //
    // For eWindowType_popup, this GtkWidget may not actually be the one that
    // receives the key events as it may be the parent window that is active.
    if (!gtk_widget_is_focus(owningWidget)) {
        // This is synchronous.  It takes focus from a plugin or from a widget
        // in an embedder.  The focus manager already knows that this window
        // is active so gBlockActivateEvent avoids another (unnecessary)
        // activate notification.
        gBlockActivateEvent = true;
        gtk_widget_grab_focus(owningWidget);
        gBlockActivateEvent = false;
    }

    // If this is the widget that already has focus, return.
    if (gFocusWindow == this) {
        LOGFOCUS(("  already have focus [%p]\n", (void *)this));
        return NS_OK;
    }

    // Set this window to be the focused child window
    gFocusWindow = this;

    if (mIMModule) {
        mIMModule->OnFocusWindow(this);
    }

    LOGFOCUS(("  widget now has focus in SetFocus() [%p]\n",
              (void *)this));

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::GetScreenBounds(nsIntRect &aRect)
{
    if (mIsTopLevel && mContainer) {
        // use the point including window decorations
        gint x, y;
        gdk_window_get_root_origin(gtk_widget_get_window(GTK_WIDGET(mContainer)), &x, &y);
        aRect.MoveTo(x, y);
    }
    else {
        aRect.MoveTo(WidgetToScreenOffset());
    }
    // mBounds.Size() is the window bounds, not the window-manager frame
    // bounds (bug 581863).  gdk_window_get_frame_extents would give the
    // frame bounds, but mBounds.Size() is returned here for consistency
    // with Resize.
    aRect.SizeTo(mBounds.Size());
    LOG(("GetScreenBounds %d,%d | %dx%d\n",
         aRect.x, aRect.y, aRect.width, aRect.height));
    return NS_OK;
}

NS_IMETHODIMP
nsWindow::GetClientBounds(nsIntRect &aRect)
{
    // GetBounds returns a rect whose top left represents the top left of the
    // outer bounds, but whose width/height represent the size of the inner
    // bounds (which is messed up).
    GetBounds(aRect);
    aRect.MoveBy(GetClientOffset());

    return NS_OK;
}

nsIntPoint
nsWindow::GetClientOffset()
{
    if (!mIsTopLevel) {
        return nsIntPoint(0, 0);
    }

    GdkAtom cardinal_atom = gdk_x11_xatom_to_atom(XA_CARDINAL);

    GdkAtom type_returned;
    int format_returned;
    int length_returned;
    long *frame_extents;
    GdkWindow* window;

    if (!mShell || !(window = gtk_widget_get_window(mShell)) ||
        !gdk_property_get(window,
                          gdk_atom_intern ("_NET_FRAME_EXTENTS", FALSE),
                          cardinal_atom,
                          0, // offset
                          4*4, // length
                          FALSE, // delete
                          &type_returned,
                          &format_returned,
                          &length_returned,
                          (guchar **) &frame_extents) ||
        length_returned/sizeof(glong) != 4) {

        return nsIntPoint(0, 0);
    }

    // data returned is in the order left, right, top, bottom
    int32_t left = int32_t(frame_extents[0]);
    int32_t top = int32_t(frame_extents[2]);

    g_free(frame_extents);

    return nsIntPoint(left, top);
}

NS_IMETHODIMP
nsWindow::SetCursor(nsCursor aCursor)
{
    // if we're not the toplevel window pass up the cursor request to
    // the toplevel window to handle it.
    if (!mContainer && mGdkWindow) {
        nsWindow *window = GetContainerWindow();
        if (!window)
            return NS_ERROR_FAILURE;

        return window->SetCursor(aCursor);
    }

    // Only change cursor if it's actually been changed
    if (aCursor != mCursor || mUpdateCursor) {
        GdkCursor *newCursor = nullptr;
        mUpdateCursor = false;

        newCursor = get_gtk_cursor(aCursor);

        if (nullptr != newCursor) {
            mCursor = aCursor;

            if (!mContainer)
                return NS_OK;

            gdk_window_set_cursor(gtk_widget_get_window(GTK_WIDGET(mContainer)), newCursor);
        }
    }

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::SetCursor(imgIContainer* aCursor,
                    uint32_t aHotspotX, uint32_t aHotspotY)
{
    // if we're not the toplevel window pass up the cursor request to
    // the toplevel window to handle it.
    if (!mContainer && mGdkWindow) {
        nsWindow *window = GetContainerWindow();
        if (!window)
            return NS_ERROR_FAILURE;

        return window->SetCursor(aCursor, aHotspotX, aHotspotY);
    }

    mCursor = nsCursor(-1);

    // Get the image's current frame
    GdkPixbuf* pixbuf = nsImageToPixbuf::ImageToPixbuf(aCursor);
    if (!pixbuf)
        return NS_ERROR_NOT_AVAILABLE;

    int width = gdk_pixbuf_get_width(pixbuf);
    int height = gdk_pixbuf_get_height(pixbuf);
    // Reject cursors greater than 128 pixels in some direction, to prevent
    // spoofing.
    // XXX ideally we should rescale. Also, we could modify the API to
    // allow trusted content to set larger cursors.
    if (width > 128 || height > 128) {
        g_object_unref(pixbuf);
        return NS_ERROR_NOT_AVAILABLE;
    }

    // Looks like all cursors need an alpha channel (tested on Gtk 2.4.4). This
    // is of course not documented anywhere...
    // So add one if there isn't one yet
    if (!gdk_pixbuf_get_has_alpha(pixbuf)) {
        GdkPixbuf* alphaBuf = gdk_pixbuf_add_alpha(pixbuf, FALSE, 0, 0, 0);
        g_object_unref(pixbuf);
        if (!alphaBuf) {
            return NS_ERROR_OUT_OF_MEMORY;
        }
        pixbuf = alphaBuf;
    }

    GdkCursor* cursor = gdk_cursor_new_from_pixbuf(gdk_display_get_default(),
                                                   pixbuf,
                                                   aHotspotX, aHotspotY);
    g_object_unref(pixbuf);
    nsresult rv = NS_ERROR_OUT_OF_MEMORY;
    if (cursor) {
        if (mContainer) {
            gdk_window_set_cursor(gtk_widget_get_window(GTK_WIDGET(mContainer)), cursor);
            rv = NS_OK;
        }
#if (MOZ_WIDGET_GTK == 3)
        g_object_unref(cursor);
#else
        gdk_cursor_unref(cursor);
#endif
    }

    return rv;
}

NS_IMETHODIMP
nsWindow::Invalidate(const nsIntRect &aRect)
{
    if (!mGdkWindow)
        return NS_OK;

    GdkRectangle rect;
    rect.x = aRect.x;
    rect.y = aRect.y;
    rect.width = aRect.width;
    rect.height = aRect.height;

    LOGDRAW(("Invalidate (rect) [%p]: %d %d %d %d\n", (void *)this,
             rect.x, rect.y, rect.width, rect.height));

    gdk_window_invalidate_rect(mGdkWindow, &rect, FALSE);

    return NS_OK;
}

void*
nsWindow::GetNativeData(uint32_t aDataType)
{
    switch (aDataType) {
    case NS_NATIVE_WINDOW:
    case NS_NATIVE_WIDGET: {
        if (!mGdkWindow)
            return nullptr;

        return mGdkWindow;
        break;
    }

    case NS_NATIVE_PLUGIN_PORT:
        return SetupPluginPort();
        break;

    case NS_NATIVE_DISPLAY:
#ifdef MOZ_X11
        return GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
#else
        return nullptr;
#endif /* MOZ_X11 */
        break;

    case NS_NATIVE_SHELLWIDGET:
        return GetToplevelWidget();

    case NS_NATIVE_SHAREABLE_WINDOW:
        return (void *) GDK_WINDOW_XID(gdk_window_get_toplevel(mGdkWindow));

    default:
        NS_WARNING("nsWindow::GetNativeData called with bad value");
        return nullptr;
    }
}

NS_IMETHODIMP
nsWindow::SetTitle(const nsAString& aTitle)
{
    if (!mShell)
        return NS_OK;

    // convert the string into utf8 and set the title.
#define UTF8_FOLLOWBYTE(ch) (((ch) & 0xC0) == 0x80)
    NS_ConvertUTF16toUTF8 titleUTF8(aTitle);
    if (titleUTF8.Length() > NS_WINDOW_TITLE_MAX_LENGTH) {
        // Truncate overlong titles (bug 167315). Make sure we chop after a
        // complete sequence by making sure the next char isn't a follow-byte.
        uint32_t len = NS_WINDOW_TITLE_MAX_LENGTH;
        while(UTF8_FOLLOWBYTE(titleUTF8[len]))
            --len;
        titleUTF8.Truncate(len);
    }
    gtk_window_set_title(GTK_WINDOW(mShell), (const char *)titleUTF8.get());

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::SetIcon(const nsAString& aIconSpec)
{
    if (!mShell)
        return NS_OK;

    nsAutoCString iconName;
    
    if (aIconSpec.EqualsLiteral("default")) {
        nsXPIDLString brandName;
        GetBrandName(brandName);
        AppendUTF16toUTF8(brandName, iconName);
        ToLowerCase(iconName);
    } else {
        AppendUTF16toUTF8(aIconSpec, iconName);
    }
    
    nsCOMPtr<nsIFile> iconFile;
    nsAutoCString path;

    gint *iconSizes =
        gtk_icon_theme_get_icon_sizes(gtk_icon_theme_get_default(),
                                      iconName.get());
    bool foundIcon = (iconSizes[0] != 0);
    g_free(iconSizes);

    if (!foundIcon) {
        // Look for icons with the following suffixes appended to the base name
        // The last two entries (for the old XPM format) will be ignored unless
        // no icons are found using other suffixes. XPM icons are deprecated.

        const char extensions[6][7] = { ".png", "16.png", "32.png", "48.png",
                                    ".xpm", "16.xpm" };

        for (uint32_t i = 0; i < ArrayLength(extensions); i++) {
            // Don't bother looking for XPM versions if we found a PNG.
            if (i == ArrayLength(extensions) - 2 && foundIcon)
                break;

            nsAutoString extension;
            extension.AppendASCII(extensions[i]);

            ResolveIconName(aIconSpec, extension, getter_AddRefs(iconFile));
            if (iconFile) {
                iconFile->GetNativePath(path);
                GdkPixbuf *icon = gdk_pixbuf_new_from_file(path.get(), nullptr);
                if (icon) {
                    gtk_icon_theme_add_builtin_icon(iconName.get(),
                                                    gdk_pixbuf_get_height(icon),
                                                    icon);
                    g_object_unref(icon);
                    foundIcon = true;
                }
            }
        }
    }

    // leave the default icon intact if no matching icons were found
    if (foundIcon) {
        gtk_window_set_icon_name(GTK_WINDOW(mShell), iconName.get());
    }

    return NS_OK;
}


nsIntPoint
nsWindow::WidgetToScreenOffset()
{
    gint x = 0, y = 0;

    if (mGdkWindow) {
        gdk_window_get_origin(mGdkWindow, &x, &y);
    }

    return nsIntPoint(x, y);
}

NS_IMETHODIMP
nsWindow::EnableDragDrop(bool aEnable)
{
    return NS_OK;
}

NS_IMETHODIMP
nsWindow::CaptureMouse(bool aCapture)
{
    LOG(("CaptureMouse %p\n", (void *)this));

    if (!mGdkWindow)
        return NS_OK;

    if (!mShell)
        return NS_ERROR_FAILURE;

    if (aCapture) {
        gtk_grab_add(mShell);
        GrabPointer(GetLastUserInputTime());
    }
    else {
        ReleaseGrabs();
        gtk_grab_remove(mShell);
    }

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::CaptureRollupEvents(nsIRollupListener *aListener,
                              bool               aDoCapture)
{
    if (!mGdkWindow)
        return NS_OK;

    if (!mShell)
        return NS_ERROR_FAILURE;

    LOG(("CaptureRollupEvents %p %i\n", this, int(aDoCapture)));

    if (aDoCapture) {
        gRollupListener = aListener;
        // real grab is only done when there is no dragging
        if (!nsWindow::DragInProgress()) {
            // This widget grab ensures that a Gecko GtkWidget receives mouse
            // events even when embedded in non-Gecko-owned GtkWidgets.
            // The grab is placed on the toplevel GtkWindow instead of the
            // MozContainer to avoid double dispatch of keyboard events
            // (bug 707623).
            gtk_grab_add(mShell);
            GrabPointer(GetLastUserInputTime());
        }
    }
    else {
        if (!nsWindow::DragInProgress()) {
            ReleaseGrabs();
        }
        // There may not have been a drag in process when aDoCapture was set,
        // so make sure to remove any added grab.  This is a no-op if the grab
        // was not added to this widget.
        gtk_grab_remove(mShell);
        gRollupListener = nullptr;
    }

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::GetAttention(int32_t aCycleCount)
{
    LOG(("nsWindow::GetAttention [%p]\n", (void *)this));

    GtkWidget* top_window = GetToplevelWidget();
    GtkWidget* top_focused_window =
        gFocusWindow ? gFocusWindow->GetToplevelWidget() : nullptr;

    // Don't get attention if the window is focused anyway.
    if (top_window && (gtk_widget_get_visible(top_window)) &&
        top_window != top_focused_window) {
        SetUrgencyHint(top_window, true);
    }

    return NS_OK;
}

bool
nsWindow::HasPendingInputEvent()
{
    // This sucks, but gtk/gdk has no way to answer the question we want while
    // excluding paint events, and there's no X API that will let us peek
    // without blocking or removing.  To prevent event reordering, peek
    // anything except expose events.  Reordering expose and others should be
    // ok, hopefully.
    bool haveEvent;
#ifdef MOZ_X11
    XEvent ev;
    Display *display = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
    haveEvent =
        XCheckMaskEvent(display,
                        KeyPressMask | KeyReleaseMask | ButtonPressMask |
                        ButtonReleaseMask | EnterWindowMask | LeaveWindowMask |
                        PointerMotionMask | PointerMotionHintMask |
                        Button1MotionMask | Button2MotionMask |
                        Button3MotionMask | Button4MotionMask |
                        Button5MotionMask | ButtonMotionMask | KeymapStateMask |
                        VisibilityChangeMask | StructureNotifyMask |
                        ResizeRedirectMask | SubstructureNotifyMask |
                        SubstructureRedirectMask | FocusChangeMask |
                        PropertyChangeMask | ColormapChangeMask |
                        OwnerGrabButtonMask, &ev);
    if (haveEvent) {
        XPutBackEvent(display, &ev);
    }
#else
    haveEvent = false;
#endif
    return haveEvent;
}

#if 0
#ifdef DEBUG
// Paint flashing code (disabled for cairo - see below)

#define CAPS_LOCK_IS_ON \
(KeymapWrapper::AreModifiersCurrentlyActive(KeymapWrapper::CAPS_LOCK))

#define WANT_PAINT_FLASHING \
(debug_WantPaintFlashing() && CAPS_LOCK_IS_ON)

#ifdef MOZ_X11
static void
gdk_window_flash(GdkWindow *    aGdkWindow,
                 unsigned int   aTimes,
                 unsigned int   aInterval,  // Milliseconds
                 GdkRegion *    aRegion)
{
  gint         x;
  gint         y;
  gint         width;
  gint         height;
  guint        i;
  GdkGC *      gc = 0;
  GdkColor     white;

#if (MOZ_WIDGET_GTK == 2)
  gdk_window_get_geometry(aGdkWindow,nullptr,nullptr,&width,&height,nullptr);
#else
  gdk_window_get_geometry(aGdkWindow,nullptr,nullptr,&width,&height);
#endif

  gdk_window_get_origin (aGdkWindow,
                         &x,
                         &y);

  gc = gdk_gc_new(gdk_get_default_root_window());

  white.pixel = WhitePixel(gdk_display,DefaultScreen(gdk_display));

  gdk_gc_set_foreground(gc,&white);
  gdk_gc_set_function(gc,GDK_XOR);
  gdk_gc_set_subwindow(gc,GDK_INCLUDE_INFERIORS);

  gdk_region_offset(aRegion, x, y);
  gdk_gc_set_clip_region(gc, aRegion);

  /*
   * Need to do this twice so that the XOR effect can replace
   * the original window contents.
   */
  for (i = 0; i < aTimes * 2; i++)
  {
    gdk_draw_rectangle(gdk_get_default_root_window(),
                       gc,
                       TRUE,
                       x,
                       y,
                       width,
                       height);

    gdk_flush();

    PR_Sleep(PR_MillisecondsToInterval(aInterval));
  }

  gdk_gc_destroy(gc);

  gdk_region_offset(aRegion, -x, -y);
}
#endif /* MOZ_X11 */
#endif // DEBUG
#endif

struct ExposeRegion
{
    nsIntRegion mRegion;

#if (MOZ_WIDGET_GTK == 2)
    GdkRectangle *mRects;
    GdkRectangle *mRectsEnd;

    ExposeRegion() : mRects(nullptr)
    {
    }
    ~ExposeRegion()
    {
        g_free(mRects);
    }
    bool Init(GdkEventExpose *aEvent)
    {
        gint nrects;
        gdk_region_get_rectangles(aEvent->region, &mRects, &nrects);

        if (nrects > MAX_RECTS_IN_REGION) {
            // Just use the bounding box
            mRects[0] = aEvent->area;
            nrects = 1;
        }

        mRectsEnd = mRects + nrects;

        for (GdkRectangle *r = mRects; r < mRectsEnd; r++) {
            mRegion.Or(mRegion, nsIntRect(r->x, r->y, r->width, r->height));
            LOGDRAW(("\t%d %d %d %d\n", r->x, r->y, r->width, r->height));
        }
        return true;
    }

#else
# ifdef cairo_copy_clip_rectangle_list
#  error "Looks like we're including Mozilla's cairo instead of system cairo"
# endif
    cairo_rectangle_list_t *mRects;

    ExposeRegion() : mRects(nullptr)
    {
    }
    ~ExposeRegion()
    {
        cairo_rectangle_list_destroy(mRects);
    }
    bool Init(cairo_t* cr)
    {
        mRects = cairo_copy_clip_rectangle_list(cr);
        if (mRects->status != CAIRO_STATUS_SUCCESS) {
            NS_WARNING("Failed to obtain cairo rectangle list.");
            return false;
        }

        for (int i = 0; i < mRects->num_rectangles; i++)  {
            const cairo_rectangle_t& r = mRects->rectangles[i];
            mRegion.Or(mRegion, nsIntRect(r.x, r.y, r.width, r.height));
            LOGDRAW(("\t%d %d %d %d\n", r.x, r.y, r.width, r.height));
        }
        return true;
    }
#endif
};

#if (MOZ_WIDGET_GTK == 2)
gboolean
nsWindow::OnExposeEvent(GdkEventExpose *aEvent)
#else
gboolean
nsWindow::OnExposeEvent(cairo_t *cr)
#endif
{
    if (mIsDestroyed) {
        return FALSE;
    }

    // Windows that are not visible will be painted after they become visible.
    if (!mGdkWindow || mIsFullyObscured || !mHasMappedToplevel)
        return FALSE;

    nsIWidgetListener *listener =
        mAttachedWidgetListener ? mAttachedWidgetListener : mWidgetListener;
    if (!listener)
        return FALSE;

    ExposeRegion exposeRegion;
#if (MOZ_WIDGET_GTK == 2)
    if (!exposeRegion.Init(aEvent)) {
#else
    if (!exposeRegion.Init(cr)) {
#endif
        return FALSE;
    }

    nsIntRegion &region = exposeRegion.mRegion;

    ClientLayerManager *clientLayers =
        (GetLayerManager()->GetBackendType() == LayersBackend::LAYERS_CLIENT)
        ? static_cast<ClientLayerManager*>(GetLayerManager())
        : nullptr;

    if (clientLayers && mCompositorParent) {
        // We need to paint to the screen even if nothing changed, since if we
        // don't have a compositing window manager, our pixels could be stale.
        clientLayers->SetNeedsComposite(true);
        clientLayers->SendInvalidRegion(region);
    }

    // Dispatch WillPaintWindow notification to allow scripts etc. to run
    // before we paint
    {
        listener->WillPaintWindow(this);

        // If the window has been destroyed during the will paint notification,
        // there is nothing left to do.
        if (!mGdkWindow)
            return TRUE;

        // Re-get the listener since the will paint notification might have
        // killed it.
        listener =
            mAttachedWidgetListener ? mAttachedWidgetListener : mWidgetListener;
        if (!listener)
            return FALSE;
    }

    if (clientLayers && mCompositorParent && clientLayers->NeedsComposite()) {
        mCompositorParent->ScheduleRenderOnCompositorThread();
        clientLayers->SetNeedsComposite(false);
    }

    LOGDRAW(("sending expose event [%p] %p 0x%lx (rects follow):\n",
             (void *)this, (void *)mGdkWindow,
             gdk_x11_window_get_xid(mGdkWindow)));

    // Our bounds may have changed after calling WillPaintWindow.  Clip
    // to the new bounds here.  The region is relative to this
    // window.
    region.And(region, nsIntRect(0, 0, mBounds.width, mBounds.height));

    bool shaped = false;
    if (eTransparencyTransparent == GetTransparencyMode()) {
        GdkScreen *screen = gdk_window_get_screen(mGdkWindow);
        if (gdk_screen_is_composited(screen) &&
            gdk_window_get_visual(mGdkWindow) ==
            gdk_screen_get_rgba_visual(screen)) {
            // Remove possible shape mask from when window manger was not
            // previously compositing.
            static_cast<nsWindow*>(GetTopLevelWidget())->
                ClearTransparencyBitmap();
        } else {
            shaped = true;
        }
    }

    if (!shaped) {
        GList *children =
            gdk_window_peek_children(mGdkWindow);
        while (children) {
            GdkWindow *gdkWin = GDK_WINDOW(children->data);
            nsWindow *kid = get_window_for_gdk_window(gdkWin);
            if (kid && gdk_window_is_visible(gdkWin)) {
                nsAutoTArray<nsIntRect,1> clipRects;
                kid->GetWindowClipRegion(&clipRects);
                nsIntRect bounds;
                kid->GetBounds(bounds);
                for (uint32_t i = 0; i < clipRects.Length(); ++i) {
                    nsIntRect r = clipRects[i] + bounds.TopLeft();
                    region.Sub(region, r);
                }
            }
            children = children->next;
        }
    }

    if (region.IsEmpty()) {
        return TRUE;
    }

    // If this widget uses OMTC...
    if (GetLayerManager()->GetBackendType() == LayersBackend::LAYERS_CLIENT) {
        listener->PaintWindow(this, region);
        listener->DidPaintWindow();
        return TRUE;
    }

    gfxASurface* surf;
#if (MOZ_WIDGET_GTK == 2)
    surf = GetThebesSurface();
#else
    surf = GetThebesSurface(cr);
#endif

    nsRefPtr<gfxContext> ctx;
    if (gfxPlatform::GetPlatform()->
            SupportsAzureContentForType(BackendType::CAIRO)) {
        IntSize intSize(surf->GetSize().width, surf->GetSize().height);
        RefPtr<DrawTarget> dt =
          gfxPlatform::GetPlatform()->CreateDrawTargetForSurface(surf, intSize);
        ctx = new gfxContext(dt);
    } else if (gfxPlatform::GetPlatform()->
                   SupportsAzureContentForType(BackendType::SKIA) &&
               surf->GetType() == gfxSurfaceType::Image) {
       gfxImageSurface* imgSurf = static_cast<gfxImageSurface*>(surf);
       SurfaceFormat format = ImageFormatToSurfaceFormat(imgSurf->Format());
       IntSize intSize(surf->GetSize().width, surf->GetSize().height);
       RefPtr<DrawTarget> dt =
         gfxPlatform::GetPlatform()->CreateDrawTargetForData(
                        imgSurf->Data(), intSize, imgSurf->Stride(), format);
       ctx = new gfxContext(dt);
    } else {
        MOZ_CRASH("Unexpected content type");
    }

#ifdef MOZ_X11
    nsIntRect boundsRect; // for shaped only

    ctx->NewPath();
    if (shaped) {
        // Collapse update area to the bounding box. This is so we only have to
        // call UpdateTranslucentWindowAlpha once. After we have dropped
        // support for non-Thebes graphics, UpdateTranslucentWindowAlpha will be
        // our private interface so we can rework things to avoid this.
        boundsRect = region.GetBounds();
        ctx->Rectangle(gfxRect(boundsRect.x, boundsRect.y,
                               boundsRect.width, boundsRect.height));
    } else {
        gfxUtils::PathFromRegion(ctx, region);
    }
    ctx->Clip();

    BufferMode layerBuffering;
    if (shaped) {
        // The double buffering is done here to extract the shape mask.
        // (The shape mask won't be necessary when a visual with an alpha
        // channel is used on compositing window managers.)
        layerBuffering = mozilla::layers::BufferMode::BUFFER_NONE;
        ctx->PushGroup(gfxContentType::COLOR_ALPHA);
#ifdef MOZ_HAVE_SHMIMAGE
    } else if (nsShmImage::UseShm()) {
        // We're using an xshm mapping as a back buffer.
        layerBuffering = mozilla::layers::BufferMode::BUFFER_NONE;
#endif // MOZ_HAVE_SHMIMAGE
    } else {
        // Get the layer manager to do double buffering (if necessary).
        layerBuffering = mozilla::layers::BufferMode::BUFFERED;
    }

#if 0
    // NOTE: Paint flashing region would be wrong for cairo, since
    // cairo inflates the update region, etc.  So don't paint flash
    // for cairo.
#ifdef DEBUG
    // XXX aEvent->region may refer to a newly-invalid area.  FIXME
    if (0 && WANT_PAINT_FLASHING && gtk_widget_get_window(aEvent))
        gdk_window_flash(mGdkWindow, 1, 100, aEvent->region);
#endif
#endif

#endif // MOZ_X11

    bool painted = false;
    {
      if (GetLayerManager()->GetBackendType() == LayersBackend::LAYERS_BASIC) {
        AutoLayerManagerSetup setupLayerManager(this, ctx, layerBuffering);
        painted = listener->PaintWindow(this, region);
      }
    }

#ifdef MOZ_X11
    // PaintWindow can Destroy us (bug 378273), avoid doing any paint
    // operations below if that happened - it will lead to XError and exit().
    if (shaped) {
        if (MOZ_LIKELY(!mIsDestroyed)) {
            if (painted) {
                nsRefPtr<gfxPattern> pattern = ctx->PopGroup();

                UpdateAlpha(pattern, boundsRect);

                ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
                ctx->SetPattern(pattern);
                ctx->Paint();
            }
        }
    }
#  ifdef MOZ_HAVE_SHMIMAGE
    if (mShmImage && MOZ_LIKELY(!mIsDestroyed)) {
#if (MOZ_WIDGET_GTK == 2)
        mShmImage->Put(mGdkWindow, exposeRegion.mRects, exposeRegion.mRectsEnd);
#else
        mShmImage->Put(mGdkWindow, exposeRegion.mRects);
#endif
    }
#  endif  // MOZ_HAVE_SHMIMAGE
#endif // MOZ_X11

    listener->DidPaintWindow();

    // Synchronously flush any new dirty areas
#if (MOZ_WIDGET_GTK == 2)
    GdkRegion* dirtyArea = gdk_window_get_update_area(mGdkWindow);
#else
    cairo_region_t* dirtyArea = gdk_window_get_update_area(mGdkWindow);
#endif

    if (dirtyArea) {
        gdk_window_invalidate_region(mGdkWindow, dirtyArea, false);
#if (MOZ_WIDGET_GTK == 2)
        gdk_region_destroy(dirtyArea);
#else
        cairo_region_destroy(dirtyArea);
#endif
        gdk_window_process_updates(mGdkWindow, false);
    }

    // check the return value!
    return TRUE;
}

void
nsWindow::UpdateAlpha(gfxPattern* aPattern, nsIntRect aBoundsRect)
{
    // We need to create our own buffer to force the stride to match the
    // expected stride.
    int32_t stride = GetAlignedStride<4>(BytesPerPixel(SurfaceFormat::A8) *
                                         aBoundsRect.width);
    int32_t bufferSize = stride * aBoundsRect.height;
    nsAutoArrayPtr<uint8_t> imageBuffer(new (std::nothrow) uint8_t[bufferSize]);
    RefPtr<DrawTarget> drawTarget = gfxPlatform::GetPlatform()->
        CreateDrawTargetForData(imageBuffer, ToIntSize(aBoundsRect.Size()),
                                stride, SurfaceFormat::A8);

    if (drawTarget) {
        Matrix transform = Matrix::Translation(-aBoundsRect.x, -aBoundsRect.y);
        drawTarget->SetTransform(transform);

        drawTarget->FillRect(Rect(aBoundsRect.x, aBoundsRect.y, aBoundsRect.width, aBoundsRect.height),
                             *aPattern->GetPattern(drawTarget),
                             DrawOptions(1.0, CompositionOp::OP_SOURCE));
    }
    UpdateTranslucentWindowAlphaInternal(aBoundsRect, imageBuffer, stride);
}

gboolean
nsWindow::OnConfigureEvent(GtkWidget *aWidget, GdkEventConfigure *aEvent)
{
    // These events are only received on toplevel windows.
    //
    // GDK ensures that the coordinates are the client window top-left wrt the
    // root window.
    //
    //   GDK calculates the cordinates for real ConfigureNotify events on
    //   managed windows (that would normally be relative to the parent
    //   window).
    //
    //   Synthetic ConfigureNotify events are from the window manager and
    //   already relative to the root window.  GDK creates all X windows with
    //   border_width = 0, so synthetic events also indicate the top-left of
    //   the client window.
    //
    //   Override-redirect windows are children of the root window so parent
    //   coordinates are root coordinates.

    LOG(("configure event [%p] %d %d %d %d\n", (void *)this,
         aEvent->x, aEvent->y, aEvent->width, aEvent->height));

    nsIntRect screenBounds;
    GetScreenBounds(screenBounds);

    if (mWindowType == eWindowType_toplevel || mWindowType == eWindowType_dialog) {
        // This check avoids unwanted rollup on spurious configure events from
        // Cygwin/X (bug 672103).
        if (mBounds.x != screenBounds.x ||
            mBounds.y != screenBounds.y) {
            CheckForRollup(0, 0, false, true);
        }
    }

    // This event indicates that the window position may have changed.
    // mBounds.Size() is updated in OnSizeAllocate().

    // (The gtk_window_get_window_type() function is only available from
    // version 2.20.)
    NS_ASSERTION(GTK_IS_WINDOW(aWidget),
                 "Configure event on widget that is not a GtkWindow");
    gint type;
    g_object_get(aWidget, "type", &type, nullptr);
    if (type == GTK_WINDOW_POPUP) {
        // Override-redirect window
        //
        // These windows should not be moved by the window manager, and so any
        // change in position is a result of our direction.  mBounds has
        // already been set in Move() or Resize(), and that is more
        // up-to-date than the position in the ConfigureNotify event if the
        // event is from an earlier window move.
        //
        // Skipping the WindowMoved call saves context menus from an infinite
        // loop when nsXULPopupManager::PopupMoved moves the window to the new
        // position and nsMenuPopupFrame::SetPopupPosition adds
        // offsetForContextMenu on each iteration.
        return FALSE;
    }

    mBounds.MoveTo(screenBounds.TopLeft());

    // XXX mozilla will invalidate the entire window after this move
    // complete.  wtf?
    NotifyWindowMoved(mBounds.x, mBounds.y);

    return FALSE;
}

void
nsWindow::OnContainerUnrealize()
{
    // The GdkWindows are about to be destroyed (but not deleted), so remove
    // their references back to their container widget while the GdkWindow
    // hierarchy is still available.

    if (mGdkWindow) {
        DestroyChildWindows();

        g_object_set_data(G_OBJECT(mGdkWindow), "nsWindow", nullptr);
        mGdkWindow = nullptr;
    }
}

void
nsWindow::OnSizeAllocate(GtkAllocation *aAllocation)
{
    LOG(("size_allocate [%p] %d %d %d %d\n",
         (void *)this, aAllocation->x, aAllocation->y,
         aAllocation->width, aAllocation->height));

    nsIntSize size(aAllocation->width, aAllocation->height);
    if (mBounds.Size() == size)
        return;

    // Invalidate the new part of the window now for the pending paint to
    // minimize background flashes (GDK does not do this for external resizes
    // of toplevels.)
    if (mBounds.width < size.width) {
        GdkRectangle rect =
            { mBounds.width, 0, size.width - mBounds.width, size.height };
        gdk_window_invalidate_rect(mGdkWindow, &rect, FALSE);
    }
    if (mBounds.height < size.height) {
        GdkRectangle rect =
            { 0, mBounds.height, size.width, size.height - mBounds.height };
        gdk_window_invalidate_rect(mGdkWindow, &rect, FALSE);
    }

    mBounds.SizeTo(size);

    if (!mGdkWindow)
        return;

    DispatchResized(size.width, size.height);
}

void
nsWindow::OnDeleteEvent()
{
    if (mWidgetListener)
        mWidgetListener->RequestWindowClose(this);
}

void
nsWindow::OnEnterNotifyEvent(GdkEventCrossing *aEvent)
{
    // This skips NotifyVirtual and NotifyNonlinearVirtual enter notify events
    // when the pointer enters a child window.  If the destination window is a
    // Gecko window then we'll catch the corresponding event on that window,
    // but we won't notice when the pointer directly enters a foreign (plugin)
    // child window without passing over a visible portion of a Gecko window.
    if (aEvent->subwindow != nullptr)
        return;

    // Check before is_parent_ungrab_enter() as the button state may have
    // changed while a non-Gecko ancestor window had a pointer grab.
    DispatchMissedButtonReleases(aEvent);

    if (is_parent_ungrab_enter(aEvent))
        return;

    WidgetMouseEvent event(true, NS_MOUSE_ENTER, this, WidgetMouseEvent::eReal);

    event.refPoint.x = nscoord(aEvent->x);
    event.refPoint.y = nscoord(aEvent->y);

    event.time = aEvent->time;

    LOG(("OnEnterNotify: %p\n", (void *)this));

    nsEventStatus status;
    DispatchEvent(&event, status);
}

// XXX Is this the right test for embedding cases?
static bool
is_top_level_mouse_exit(GdkWindow* aWindow, GdkEventCrossing *aEvent)
{
    gint x = gint(aEvent->x_root);
    gint y = gint(aEvent->y_root);
    GdkDisplay* display = gdk_window_get_display(aWindow);
    GdkWindow* winAtPt = gdk_display_get_window_at_pointer(display, &x, &y);
    if (!winAtPt)
        return true;
    GdkWindow* topLevelAtPt = gdk_window_get_toplevel(winAtPt);
    GdkWindow* topLevelWidget = gdk_window_get_toplevel(aWindow);
    return topLevelAtPt != topLevelWidget;
}

void
nsWindow::OnLeaveNotifyEvent(GdkEventCrossing *aEvent)
{
    // This ignores NotifyVirtual and NotifyNonlinearVirtual leave notify
    // events when the pointer leaves a child window.  If the destination
    // window is a Gecko window then we'll catch the corresponding event on
    // that window.
    //
    // XXXkt However, we will miss toplevel exits when the pointer directly
    // leaves a foreign (plugin) child window without passing over a visible
    // portion of a Gecko window.
    if (aEvent->subwindow != nullptr)
        return;

    WidgetMouseEvent event(true, NS_MOUSE_EXIT, this, WidgetMouseEvent::eReal);

    event.refPoint.x = nscoord(aEvent->x);
    event.refPoint.y = nscoord(aEvent->y);

    event.time = aEvent->time;

    event.exit = is_top_level_mouse_exit(mGdkWindow, aEvent)
        ? WidgetMouseEvent::eTopLevel : WidgetMouseEvent::eChild;

    LOG(("OnLeaveNotify: %p\n", (void *)this));

    nsEventStatus status;
    DispatchEvent(&event, status);
}

void
nsWindow::OnMotionNotifyEvent(GdkEventMotion *aEvent)
{
    // see if we can compress this event
    // XXXldb Why skip every other motion event when we have multiple,
    // but not more than that?
    bool synthEvent = false;
#ifdef MOZ_X11
    XEvent xevent;

    while (XPending (GDK_WINDOW_XDISPLAY(aEvent->window))) {
        XEvent peeked;
        XPeekEvent (GDK_WINDOW_XDISPLAY(aEvent->window), &peeked);
        if (peeked.xany.window != gdk_x11_window_get_xid(aEvent->window)
            || peeked.type != MotionNotify)
            break;

        synthEvent = true;
        XNextEvent (GDK_WINDOW_XDISPLAY(aEvent->window), &xevent);
    }
#if (MOZ_WIDGET_GTK == 2)
    // if plugins still keeps the focus, get it back
    if (gPluginFocusWindow && gPluginFocusWindow != this) {
        nsRefPtr<nsWindow> kungFuDeathGrip = gPluginFocusWindow;
        gPluginFocusWindow->LoseNonXEmbedPluginFocus();
    }
#endif /* MOZ_WIDGET_GTK2 */
#endif /* MOZ_X11 */

    WidgetMouseEvent event(true, NS_MOUSE_MOVE, this, WidgetMouseEvent::eReal);

    gdouble pressure = 0;
    gdk_event_get_axis ((GdkEvent*)aEvent, GDK_AXIS_PRESSURE, &pressure);
    // Sometime gdk generate 0 pressure value between normal values
    // We have to ignore that and use last valid value
    if (pressure)
      mLastMotionPressure = pressure;
    event.pressure = mLastMotionPressure;

    guint modifierState;
    if (synthEvent) {
#ifdef MOZ_X11
        event.refPoint.x = nscoord(xevent.xmotion.x);
        event.refPoint.y = nscoord(xevent.xmotion.y);

        modifierState = xevent.xmotion.state;

        event.time = xevent.xmotion.time;
#else
        event.refPoint.x = nscoord(aEvent->x);
        event.refPoint.y = nscoord(aEvent->y);

        modifierState = aEvent->state;

        event.time = aEvent->time;
#endif /* MOZ_X11 */
    }
    else {
        // XXX see OnScrollEvent()
        if (aEvent->window == mGdkWindow) {
            event.refPoint.x = nscoord(aEvent->x);
            event.refPoint.y = nscoord(aEvent->y);
        } else {
            LayoutDeviceIntPoint point(NSToIntFloor(aEvent->x_root),
                                       NSToIntFloor(aEvent->y_root));
            event.refPoint = point -
                LayoutDeviceIntPoint::FromUntyped(WidgetToScreenOffset());
        }

        modifierState = aEvent->state;

        event.time = aEvent->time;
    }

    KeymapWrapper::InitInputEvent(event, modifierState);

    nsEventStatus status;
    DispatchEvent(&event, status);
}

// If the automatic pointer grab on ButtonPress has deactivated before
// ButtonRelease, and the mouse button is released while the pointer is not
// over any a Gecko window, then the ButtonRelease event will not be received.
// (A similar situation exists when the pointer is grabbed with owner_events
// True as the ButtonRelease may be received on a foreign [plugin] window).
// Use this method to check for released buttons when the pointer returns to a
// Gecko window.
void
nsWindow::DispatchMissedButtonReleases(GdkEventCrossing *aGdkEvent)
{
    guint changed = aGdkEvent->state ^ gButtonState;
    // Only consider button releases.
    // (Ignore button presses that occurred outside Gecko.)
    guint released = changed & gButtonState;
    gButtonState = aGdkEvent->state;

    // Loop over each button, excluding mouse wheel buttons 4 and 5 for which
    // GDK ignores releases.
    for (guint buttonMask = GDK_BUTTON1_MASK;
         buttonMask <= GDK_BUTTON3_MASK;
         buttonMask <<= 1) {

        if (released & buttonMask) {
            int16_t buttonType;
            switch (buttonMask) {
            case GDK_BUTTON1_MASK:
                buttonType = WidgetMouseEvent::eLeftButton;
                break;
            case GDK_BUTTON2_MASK:
                buttonType = WidgetMouseEvent::eMiddleButton;
                break;
            default:
                NS_ASSERTION(buttonMask == GDK_BUTTON3_MASK,
                             "Unexpected button mask");
                buttonType = WidgetMouseEvent::eRightButton;
            }

            LOG(("Synthesized button %u release on %p\n",
                 guint(buttonType + 1), (void *)this));

            // Dispatch a synthesized button up event to tell Gecko about the
            // change in state.  This event is marked as synthesized so that
            // it is not dispatched as a DOM event, because we don't know the
            // position, widget, modifiers, or time/order.
            WidgetMouseEvent synthEvent(true, NS_MOUSE_BUTTON_UP, this,
                                        WidgetMouseEvent::eSynthesized);
            synthEvent.button = buttonType;
            nsEventStatus status;
            DispatchEvent(&synthEvent, status);
        }
    }
}

void
nsWindow::InitButtonEvent(WidgetMouseEvent& aEvent,
                          GdkEventButton* aGdkEvent)
{
    // XXX see OnScrollEvent()
    if (aGdkEvent->window == mGdkWindow) {
        aEvent.refPoint.x = nscoord(aGdkEvent->x);
        aEvent.refPoint.y = nscoord(aGdkEvent->y);
    } else {
        LayoutDeviceIntPoint point(NSToIntFloor(aGdkEvent->x_root),
                                   NSToIntFloor(aGdkEvent->y_root));
        aEvent.refPoint = point -
            LayoutDeviceIntPoint::FromUntyped(WidgetToScreenOffset());
    }

    guint modifierState = aGdkEvent->state;
    // aEvent's state doesn't include this event's information.  Therefore,
    // if aEvent is mouse button down event, we need to set it manually.
    // Note that we cannot do same thing for NS_MOUSE_BUTTON_UP because
    // system may have two or more mice and same button of another mouse
    // may be still pressed.
    if (aGdkEvent->type != GDK_BUTTON_RELEASE) {
        switch (aGdkEvent->button) {
            case 1:
                modifierState |= GDK_BUTTON1_MASK;
                break;
            case 2:
                modifierState |= GDK_BUTTON2_MASK;
                break;
            case 3:
                modifierState |= GDK_BUTTON3_MASK;
                break;
        }
    }

    KeymapWrapper::InitInputEvent(aEvent, modifierState);

    aEvent.time = aGdkEvent->time;

    switch (aGdkEvent->type) {
    case GDK_2BUTTON_PRESS:
        aEvent.clickCount = 2;
        break;
    case GDK_3BUTTON_PRESS:
        aEvent.clickCount = 3;
        break;
        // default is one click
    default:
        aEvent.clickCount = 1;
    }
}

static guint ButtonMaskFromGDKButton(guint button)
{
    return GDK_BUTTON1_MASK << (button - 1);
}

void
nsWindow::OnButtonPressEvent(GdkEventButton *aEvent)
{
    LOG(("Button %u press on %p\n", aEvent->button, (void *)this));

    nsEventStatus status;

    // If you double click in GDK, it will actually generate a second
    // GDK_BUTTON_PRESS before sending the GDK_2BUTTON_PRESS, and this is
    // different than the DOM spec.  GDK puts this in the queue
    // programatically, so it's safe to assume that if there's a
    // double click in the queue, it was generated so we can just drop
    // this click.
    GdkEvent *peekedEvent = gdk_event_peek();
    if (peekedEvent) {
        GdkEventType type = peekedEvent->any.type;
        gdk_event_free(peekedEvent);
        if (type == GDK_2BUTTON_PRESS || type == GDK_3BUTTON_PRESS)
            return;
    }

    nsWindow *containerWindow = GetContainerWindow();
    if (!gFocusWindow && containerWindow) {
        containerWindow->DispatchActivateEvent();
    }

    // check to see if we should rollup
    if (CheckForRollup(aEvent->x_root, aEvent->y_root, false, false))
        return;

    gdouble pressure = 0;
    gdk_event_get_axis ((GdkEvent*)aEvent, GDK_AXIS_PRESSURE, &pressure);
    mLastMotionPressure = pressure;

    uint16_t domButton;
    switch (aEvent->button) {
    case 1:
        domButton = WidgetMouseEvent::eLeftButton;
        break;
    case 2:
        domButton = WidgetMouseEvent::eMiddleButton;
        break;
    case 3:
        domButton = WidgetMouseEvent::eRightButton;
        break;
    // These are mapped to horizontal scroll
    case 6:
    case 7:
        NS_WARNING("We're not supporting legacy horizontal scroll event");
        return;
    // Map buttons 8-9 to back/forward
    case 8:
        DispatchCommandEvent(nsGkAtoms::Back);
        return;
    case 9:
        DispatchCommandEvent(nsGkAtoms::Forward);
        return;
    default:
        return;
    }

    gButtonState |= ButtonMaskFromGDKButton(aEvent->button);

    WidgetMouseEvent event(true, NS_MOUSE_BUTTON_DOWN, this,
                           WidgetMouseEvent::eReal);
    event.button = domButton;
    InitButtonEvent(event, aEvent);
    event.pressure = mLastMotionPressure;

    DispatchEvent(&event, status);

    // right menu click on linux should also pop up a context menu
    if (domButton == WidgetMouseEvent::eRightButton &&
        MOZ_LIKELY(!mIsDestroyed)) {
        WidgetMouseEvent contextMenuEvent(true, NS_CONTEXTMENU, this,
                                          WidgetMouseEvent::eReal);
        InitButtonEvent(contextMenuEvent, aEvent);
        contextMenuEvent.pressure = mLastMotionPressure;
        DispatchEvent(&contextMenuEvent, status);
    }
}

void
nsWindow::OnButtonReleaseEvent(GdkEventButton *aEvent)
{
    LOG(("Button %u release on %p\n", aEvent->button, (void *)this));

    uint16_t domButton;
    switch (aEvent->button) {
    case 1:
        domButton = WidgetMouseEvent::eLeftButton;
        break;
    case 2:
        domButton = WidgetMouseEvent::eMiddleButton;
        break;
    case 3:
        domButton = WidgetMouseEvent::eRightButton;
        break;
    default:
        return;
    }

    gButtonState &= ~ButtonMaskFromGDKButton(aEvent->button);

    WidgetMouseEvent event(true, NS_MOUSE_BUTTON_UP, this,
                           WidgetMouseEvent::eReal);
    event.button = domButton;
    InitButtonEvent(event, aEvent);
    gdouble pressure = 0;
    gdk_event_get_axis ((GdkEvent*)aEvent, GDK_AXIS_PRESSURE, &pressure);
    event.pressure = pressure ? pressure : mLastMotionPressure;

    nsEventStatus status;
    DispatchEvent(&event, status);
    mLastMotionPressure = pressure;
}

void
nsWindow::OnContainerFocusInEvent(GdkEventFocus *aEvent)
{
    LOGFOCUS(("OnContainerFocusInEvent [%p]\n", (void *)this));

    // Unset the urgency hint, if possible
    GtkWidget* top_window = GetToplevelWidget();
    if (top_window && (gtk_widget_get_visible(top_window)))
        SetUrgencyHint(top_window, false);

    // Return if being called within SetFocus because the focus manager
    // already knows that the window is active.
    if (gBlockActivateEvent) {
        LOGFOCUS(("activated notification is blocked [%p]\n", (void *)this));
        return;
    }

    // If keyboard input will be accepted, the focus manager will call
    // SetFocus to set the correct window.
    gFocusWindow = nullptr;

    DispatchActivateEvent();

    if (!gFocusWindow) {
        // We don't really have a window for dispatching key events, but
        // setting a non-nullptr value here prevents OnButtonPressEvent() from
        // dispatching an activation notification if the widget is already
        // active.
        gFocusWindow = this;
    }

    LOGFOCUS(("Events sent from focus in event [%p]\n", (void *)this));
}

void
nsWindow::OnContainerFocusOutEvent(GdkEventFocus *aEvent)
{
    LOGFOCUS(("OnContainerFocusOutEvent [%p]\n", (void *)this));

    if (mWindowType == eWindowType_toplevel || mWindowType == eWindowType_dialog) {
        nsCOMPtr<nsIDragService> dragService = do_GetService(kCDragServiceCID);
        nsCOMPtr<nsIDragSession> dragSession;
        dragService->GetCurrentSession(getter_AddRefs(dragSession));

        // Rollup popups when a window is focused out unless a drag is occurring.
        // This check is because drags grab the keyboard and cause a focus out on
        // versions of GTK before 2.18.
        bool shouldRollup = !dragSession;
        if (!shouldRollup) {
            // we also roll up when a drag is from a different application
            nsCOMPtr<nsIDOMNode> sourceNode;
            dragSession->GetSourceNode(getter_AddRefs(sourceNode));
            shouldRollup = (sourceNode == nullptr);
        }

        if (shouldRollup) {
            CheckForRollup(0, 0, false, true);
        }
    }

#if (MOZ_WIDGET_GTK == 2) && defined(MOZ_X11)
    // plugin lose focus
    if (gPluginFocusWindow) {
        nsRefPtr<nsWindow> kungFuDeathGrip = gPluginFocusWindow;
        gPluginFocusWindow->LoseNonXEmbedPluginFocus();
    }
#endif /* MOZ_X11 && MOZ_WIDGET_GTK2 */

    if (gFocusWindow) {
        nsRefPtr<nsWindow> kungFuDeathGrip = gFocusWindow;
        if (gFocusWindow->mIMModule) {
            gFocusWindow->mIMModule->OnBlurWindow(gFocusWindow);
        }
        gFocusWindow = nullptr;
    }

    DispatchDeactivateEvent();

    LOGFOCUS(("Done with container focus out [%p]\n", (void *)this));
}

bool
nsWindow::DispatchCommandEvent(nsIAtom* aCommand)
{
    nsEventStatus status;
    WidgetCommandEvent event(true, nsGkAtoms::onAppCommand, aCommand, this);
    DispatchEvent(&event, status);
    return TRUE;
}

bool
nsWindow::DispatchContentCommandEvent(int32_t aMsg)
{
  nsEventStatus status;
  WidgetContentCommandEvent event(true, aMsg, this);
  DispatchEvent(&event, status);
  return TRUE;
}

static bool
IsCtrlAltTab(GdkEventKey *aEvent)
{
    return aEvent->keyval == GDK_Tab &&
        KeymapWrapper::AreModifiersActive(
            KeymapWrapper::CTRL | KeymapWrapper::ALT, aEvent->state);
}

bool
nsWindow::DispatchKeyDownEvent(GdkEventKey *aEvent, bool *aCancelled)
{
    NS_PRECONDITION(aCancelled, "aCancelled must not be null");

    *aCancelled = false;

    if (IsCtrlAltTab(aEvent)) {
        return false;
    }

    // send the key down event
    nsEventStatus status;
    WidgetKeyboardEvent downEvent(true, NS_KEY_DOWN, this);
    KeymapWrapper::InitKeyEvent(downEvent, aEvent);
    DispatchEvent(&downEvent, status);
    *aCancelled = (status == nsEventStatus_eConsumeNoDefault);
    return true;
}

gboolean
nsWindow::OnKeyPressEvent(GdkEventKey *aEvent)
{
    LOGFOCUS(("OnKeyPressEvent [%p]\n", (void *)this));

    // if we are in the middle of composing text, XIM gets to see it
    // before mozilla does.
    bool IMEWasEnabled = false;
    if (mIMModule) {
        IMEWasEnabled = mIMModule->IsEnabled();
        if (mIMModule->OnKeyEvent(this, aEvent)) {
            return TRUE;
        }
    }

    nsEventStatus status;

    // work around for annoying things.
    if (IsCtrlAltTab(aEvent)) {
        return TRUE;
    }

    nsCOMPtr<nsIWidget> kungFuDeathGrip = this;

    // Dispatch keydown event always.  At auto repeating, we should send
    // KEYDOWN -> KEYPRESS -> KEYDOWN -> KEYPRESS ... -> KEYUP
    // However, old distributions (e.g., Ubuntu 9.10) sent native key
    // release event, so, on such platform, the DOM events will be:
    // KEYDOWN -> KEYPRESS -> KEYUP -> KEYDOWN -> KEYPRESS -> KEYUP...

    bool isKeyDownCancelled = false;
    if (DispatchKeyDownEvent(aEvent, &isKeyDownCancelled) &&
        (MOZ_UNLIKELY(mIsDestroyed) || isKeyDownCancelled)) {
        return TRUE;
    }

    // If a keydown event handler causes to enable IME, i.e., it moves
    // focus from IME unusable content to IME usable editor, we should
    // send the native key event to IME for the first input on the editor.
    if (!IMEWasEnabled && mIMModule && mIMModule->IsEnabled()) {
        // Notice our keydown event was already dispatched.  This prevents
        // unnecessary DOM keydown event in the editor.
        if (mIMModule->OnKeyEvent(this, aEvent, true)) {
            return TRUE;
        }
    }

    // Don't pass modifiers as NS_KEY_PRESS events.
    // TODO: Instead of selectively excluding some keys from NS_KEY_PRESS events,
    //       we should instead selectively include (as per MSDN spec; no official
    //       spec covers KeyPress events).
    if (!KeymapWrapper::IsKeyPressEventNecessary(aEvent)) {
        return TRUE;
    }

#ifdef MOZ_X11
#if ! defined AIX // no XFree86 on AIX 5L
    // Look for specialized app-command keys
    switch (aEvent->keyval) {
        case XF86XK_Back:
            return DispatchCommandEvent(nsGkAtoms::Back);
        case XF86XK_Forward:
            return DispatchCommandEvent(nsGkAtoms::Forward);
        case XF86XK_Refresh:
            return DispatchCommandEvent(nsGkAtoms::Reload);
        case XF86XK_Stop:
            return DispatchCommandEvent(nsGkAtoms::Stop);
        case XF86XK_Search:
            return DispatchCommandEvent(nsGkAtoms::Search);
        case XF86XK_Favorites:
            return DispatchCommandEvent(nsGkAtoms::Bookmarks);
        case XF86XK_HomePage:
            return DispatchCommandEvent(nsGkAtoms::Home);
        case XF86XK_Copy:
        case GDK_F16:  // F16, F20, F18, F14 are old keysyms for Copy Cut Paste Undo
            return DispatchContentCommandEvent(NS_CONTENT_COMMAND_COPY);
        case XF86XK_Cut:
        case GDK_F20:
            return DispatchContentCommandEvent(NS_CONTENT_COMMAND_CUT);
        case XF86XK_Paste:
        case GDK_F18:
            return DispatchContentCommandEvent(NS_CONTENT_COMMAND_PASTE);
        case GDK_Redo:
            return DispatchContentCommandEvent(NS_CONTENT_COMMAND_REDO);
        case GDK_Undo:
        case GDK_F14:
            return DispatchContentCommandEvent(NS_CONTENT_COMMAND_UNDO);
    }
#endif /* ! AIX */
#endif /* MOZ_X11 */

    WidgetKeyboardEvent event(true, NS_KEY_PRESS, this);
    KeymapWrapper::InitKeyEvent(event, aEvent);

    // before we dispatch a key, check if it's the context menu key.
    // If so, send a context menu key event instead.
    if (is_context_menu_key(event)) {
        WidgetMouseEvent contextMenuEvent(true, NS_CONTEXTMENU, this,
                                          WidgetMouseEvent::eReal,
                                          WidgetMouseEvent::eContextMenuKey);

        contextMenuEvent.refPoint = LayoutDeviceIntPoint(0, 0);
        contextMenuEvent.time = aEvent->time;
        contextMenuEvent.clickCount = 1;
        KeymapWrapper::InitInputEvent(contextMenuEvent, aEvent->state);
        DispatchEvent(&contextMenuEvent, status);
    }
    else {
        // If the character code is in the BMP, send the key press event.
        // Otherwise, send a compositionchange event with the equivalent UTF-16
        // string.
        if (IS_IN_BMP(event.charCode)) {
            DispatchEvent(&event, status);
        }
        else {
            WidgetCompositionEvent compositionChangeEvent(
                                     true, NS_COMPOSITION_CHANGE, this);
            char16_t textString[3];
            textString[0] = H_SURROGATE(event.charCode);
            textString[1] = L_SURROGATE(event.charCode);
            textString[2] = 0;
            compositionChangeEvent.mData = textString;
            compositionChangeEvent.time = event.time;
            DispatchEvent(&compositionChangeEvent, status);
        }
    }

    // If the event was consumed, return.
    if (status == nsEventStatus_eConsumeNoDefault) {
        return TRUE;
    }

    return FALSE;
}

gboolean
nsWindow::OnKeyReleaseEvent(GdkEventKey *aEvent)
{
    LOGFOCUS(("OnKeyReleaseEvent [%p]\n", (void *)this));

    if (mIMModule && mIMModule->OnKeyEvent(this, aEvent)) {
        return TRUE;
    }

    // send the key event as a key up event
    WidgetKeyboardEvent event(true, NS_KEY_UP, this);
    KeymapWrapper::InitKeyEvent(event, aEvent);

    nsEventStatus status;
    DispatchEvent(&event, status);

    // If the event was consumed, return.
    if (status == nsEventStatus_eConsumeNoDefault) {
        return TRUE;
    }

    return FALSE;
}

void
nsWindow::OnScrollEvent(GdkEventScroll *aEvent)
{
    // check to see if we should rollup
    if (CheckForRollup(aEvent->x_root, aEvent->y_root, true, false))
        return;
#if GTK_CHECK_VERSION(3,4,0)
    // check for duplicate legacy scroll event, see GNOME bug 726878
    if (mLastScrollEventTime == aEvent->time)
        return; 
#endif
    WidgetWheelEvent wheelEvent(true, NS_WHEEL_WHEEL, this);
    wheelEvent.deltaMode = nsIDOMWheelEvent::DOM_DELTA_LINE;
    switch (aEvent->direction) {
#if GTK_CHECK_VERSION(3,4,0)
    case GDK_SCROLL_SMOOTH:
    {
        // As of GTK 3.4, all directional scroll events are provided by
        // the GDK_SCROLL_SMOOTH direction on XInput2 devices.
        mLastScrollEventTime = aEvent->time;
        // TODO - use a more appropriate scrolling unit than lines.
        // Multiply event deltas by 3 to emulate legacy behaviour.
        wheelEvent.deltaX = aEvent->delta_x * 3;
        wheelEvent.deltaY = aEvent->delta_y * 3;
        wheelEvent.mIsNoLineOrPageDelta = true;
        // This next step manually unsets smooth scrolling for touch devices 
        // that trigger GDK_SCROLL_SMOOTH. We use the slave device, which 
        // represents the actual input.
        GdkDevice *device = gdk_event_get_source_device((GdkEvent*)aEvent);
        GdkInputSource source = gdk_device_get_source(device);
        if (source == GDK_SOURCE_TOUCHSCREEN ||
            source == GDK_SOURCE_TOUCHPAD) {
            wheelEvent.scrollType = WidgetWheelEvent::SCROLL_ASYNCHRONOUSELY;
        }
        break;
    }
#endif
    case GDK_SCROLL_UP:
        wheelEvent.deltaY = wheelEvent.lineOrPageDeltaY = -3;
        break;
    case GDK_SCROLL_DOWN:
        wheelEvent.deltaY = wheelEvent.lineOrPageDeltaY = 3;
        break;
    case GDK_SCROLL_LEFT:
        wheelEvent.deltaX = wheelEvent.lineOrPageDeltaX = -1;
        break;
    case GDK_SCROLL_RIGHT:
        wheelEvent.deltaX = wheelEvent.lineOrPageDeltaX = 1;
        break;
    }

    NS_ASSERTION(wheelEvent.deltaX || wheelEvent.deltaY,
                 "deltaX or deltaY must be non-zero");

    if (aEvent->window == mGdkWindow) {
        // we are the window that the event happened on so no need for expensive WidgetToScreenOffset
        wheelEvent.refPoint.x = nscoord(aEvent->x);
        wheelEvent.refPoint.y = nscoord(aEvent->y);
    } else {
        // XXX we're never quite sure which GdkWindow the event came from due to our custom bubbling
        // in scroll_event_cb(), so use ScreenToWidget to translate the screen root coordinates into
        // coordinates relative to this widget.
        LayoutDeviceIntPoint point(NSToIntFloor(aEvent->x_root),
                                   NSToIntFloor(aEvent->y_root));
        wheelEvent.refPoint = point -
            LayoutDeviceIntPoint::FromUntyped(WidgetToScreenOffset());
    }

    KeymapWrapper::InitInputEvent(wheelEvent, aEvent->state);

    wheelEvent.time = aEvent->time;

    nsEventStatus status;
    DispatchEvent(&wheelEvent, status);
}

void
nsWindow::OnVisibilityNotifyEvent(GdkEventVisibility *aEvent)
{
    LOGDRAW(("Visibility event %i on [%p] %p\n",
             aEvent->state, this, aEvent->window));

    if (!mGdkWindow)
        return;

    switch (aEvent->state) {
    case GDK_VISIBILITY_UNOBSCURED:
    case GDK_VISIBILITY_PARTIAL:
        if (mIsFullyObscured && mHasMappedToplevel) {
            // GDK_EXPOSE events have been ignored, so make sure GDK
            // doesn't think that the window has already been painted.
            gdk_window_invalidate_rect(mGdkWindow, nullptr, FALSE);
        }

        mIsFullyObscured = false;

        // if we have to retry the grab, retry it.
        EnsureGrabs();
        break;
    default: // includes GDK_VISIBILITY_FULLY_OBSCURED
        mIsFullyObscured = true;
        break;
    }
}

void
nsWindow::OnWindowStateEvent(GtkWidget *aWidget, GdkEventWindowState *aEvent)
{
    LOG(("nsWindow::OnWindowStateEvent [%p] changed %d new_window_state %d\n",
         (void *)this, aEvent->changed_mask, aEvent->new_window_state));

    if (IS_MOZ_CONTAINER(aWidget)) {
        // This event is notifying the container widget of changes to the
        // toplevel window.  Just detect changes affecting whether windows are
        // viewable.
        //
        // (A visibility notify event is sent to each window that becomes
        // viewable when the toplevel is mapped, but we can't rely on that for
        // setting mHasMappedToplevel because these toplevel window state
        // events are asynchronous.  The windows in the hierarchy now may not
        // be the same windows as when the toplevel was mapped, so they may
        // not get VisibilityNotify events.)
        bool mapped =
            !(aEvent->new_window_state &
              (GDK_WINDOW_STATE_ICONIFIED|GDK_WINDOW_STATE_WITHDRAWN));
        if (mHasMappedToplevel != mapped) {
            SetHasMappedToplevel(mapped);
        }
        return;
    }
    // else the widget is a shell widget.

    // We don't care about anything but changes in the maximized/icon/fullscreen
    // states
    if ((aEvent->changed_mask
         & (GDK_WINDOW_STATE_ICONIFIED |
            GDK_WINDOW_STATE_MAXIMIZED |
            GDK_WINDOW_STATE_FULLSCREEN)) == 0) {
        return;
    }

    if (aEvent->new_window_state & GDK_WINDOW_STATE_ICONIFIED) {
        LOG(("\tIconified\n"));
        mSizeState = nsSizeMode_Minimized;
#ifdef ACCESSIBILITY
        DispatchMinimizeEventAccessible();
#endif //ACCESSIBILITY
    }
    else if (aEvent->new_window_state & GDK_WINDOW_STATE_FULLSCREEN) {
        LOG(("\tFullscreen\n"));
        mSizeState = nsSizeMode_Fullscreen;
    }
    else if (aEvent->new_window_state & GDK_WINDOW_STATE_MAXIMIZED) {
        LOG(("\tMaximized\n"));
        mSizeState = nsSizeMode_Maximized;
#ifdef ACCESSIBILITY
        DispatchMaximizeEventAccessible();
#endif //ACCESSIBILITY
    }
    else {
        LOG(("\tNormal\n"));
        mSizeState = nsSizeMode_Normal;
#ifdef ACCESSIBILITY
        DispatchRestoreEventAccessible();
#endif //ACCESSIBILITY
    }

    if (mWidgetListener)
      mWidgetListener->SizeModeChanged(mSizeState);
}

void
nsWindow::ThemeChanged()
{
    NotifyThemeChanged();

    if (!mGdkWindow || MOZ_UNLIKELY(mIsDestroyed))
        return;

    // Dispatch theme change notification to all child windows
    GList *children =
        gdk_window_peek_children(mGdkWindow);
    while (children) {
        GdkWindow *gdkWin = GDK_WINDOW(children->data);

        nsWindow *win = (nsWindow*) g_object_get_data(G_OBJECT(gdkWin),
                                                      "nsWindow");

        if (win && win != this) { // guard against infinite recursion
            nsRefPtr<nsWindow> kungFuDeathGrip = win;
            win->ThemeChanged();
        }

        children = children->next;
    }
}

void
nsWindow::DispatchDragEvent(uint32_t aMsg, const nsIntPoint& aRefPoint,
                            guint aTime)
{
    WidgetDragEvent event(true, aMsg, this);

    if (aMsg == NS_DRAGDROP_OVER) {
        InitDragEvent(event);
    }

    event.refPoint = LayoutDeviceIntPoint::FromUntyped(aRefPoint);
    event.time = aTime;

    nsEventStatus status;
    DispatchEvent(&event, status);
}

void
nsWindow::OnDragDataReceivedEvent(GtkWidget *aWidget,
                                  GdkDragContext *aDragContext,
                                  gint aX,
                                  gint aY,
                                  GtkSelectionData  *aSelectionData,
                                  guint aInfo,
                                  guint aTime,
                                  gpointer aData)
{
    LOGDRAG(("nsWindow::OnDragDataReceived(%p)\n", (void*)this));

    nsDragService::GetInstance()->
        TargetDataReceived(aWidget, aDragContext, aX, aY,
                           aSelectionData, aInfo, aTime);
}

static void
GetBrandName(nsXPIDLString& brandName)
{
    nsCOMPtr<nsIStringBundleService> bundleService =
        do_GetService(NS_STRINGBUNDLE_CONTRACTID);

    nsCOMPtr<nsIStringBundle> bundle;
    if (bundleService)
        bundleService->CreateBundle(
            "chrome://branding/locale/brand.properties",
            getter_AddRefs(bundle));

    if (bundle)
        bundle->GetStringFromName(
            MOZ_UTF16("brandShortName"),
            getter_Copies(brandName));

    if (brandName.IsEmpty())
        brandName.AssignLiteral(MOZ_UTF16("Mozilla"));
}

static GdkWindow *
CreateGdkWindow(GdkWindow *parent, GtkWidget *widget)
{
    GdkWindowAttr attributes;
    gint          attributes_mask = GDK_WA_VISUAL;

    attributes.event_mask = kEvents;

    attributes.width = 1;
    attributes.height = 1;
    attributes.wclass = GDK_INPUT_OUTPUT;
    attributes.visual = gtk_widget_get_visual(widget);
    attributes.window_type = GDK_WINDOW_CHILD;

#if (MOZ_WIDGET_GTK == 2)
    attributes_mask |= GDK_WA_COLORMAP;
    attributes.colormap = gtk_widget_get_colormap(widget);
#endif

    GdkWindow *window = gdk_window_new(parent, &attributes, attributes_mask);
    gdk_window_set_user_data(window, widget);

// GTK3 TODO?
#if (MOZ_WIDGET_GTK == 2)
    /* set the default pixmap to None so that you don't end up with the
       gtk default which is BlackPixel. */
    gdk_window_set_back_pixmap(window, nullptr, FALSE);
#endif

    return window;
}

nsresult
nsWindow::Create(nsIWidget        *aParent,
                 nsNativeWidget    aNativeParent,
                 const nsIntRect  &aRect,
                 nsDeviceContext *aContext,
                 nsWidgetInitData *aInitData)
{
    // only set the base parent if we're going to be a dialog or a
    // toplevel
    nsIWidget *baseParent = aInitData &&
        (aInitData->mWindowType == eWindowType_dialog ||
         aInitData->mWindowType == eWindowType_toplevel ||
         aInitData->mWindowType == eWindowType_invisible) ?
        nullptr : aParent;

#ifdef ACCESSIBILITY
    // Send a DBus message to check whether a11y is enabled
    a11y::PreInit();
#endif

    // Ensure that the toolkit is created.
    nsGTKToolkit::GetToolkit();

    // initialize all the common bits of this class
    BaseCreate(baseParent, aRect, aContext, aInitData);

    // Do we need to listen for resizes?
    bool listenForResizes = false;;
    if (aNativeParent || (aInitData && aInitData->mListenForResizes))
        listenForResizes = true;

    // and do our common creation
    CommonCreate(aParent, listenForResizes);

    // save our bounds
    mBounds = aRect;
    ConstrainSize(&mBounds.width, &mBounds.height);

    // figure out our parent window
    GtkWidget      *parentMozContainer = nullptr;
    GtkContainer   *parentGtkContainer = nullptr;
    GdkWindow      *parentGdkWindow = nullptr;
    GtkWindow      *topLevelParent = nullptr;
    nsWindow       *parentnsWindow = nullptr;
    GtkWidget      *eventWidget = nullptr;

    if (aParent) {
        parentnsWindow = static_cast<nsWindow*>(aParent);
        parentGdkWindow = parentnsWindow->mGdkWindow;
    } else if (aNativeParent && GDK_IS_WINDOW(aNativeParent)) {
        parentGdkWindow = GDK_WINDOW(aNativeParent);
        parentnsWindow = get_window_for_gdk_window(parentGdkWindow);
        if (!parentnsWindow)
            return NS_ERROR_FAILURE;

    } else if (aNativeParent && GTK_IS_CONTAINER(aNativeParent)) {
        parentGtkContainer = GTK_CONTAINER(aNativeParent);
    }

    if (parentGdkWindow) {
        // get the widget for the window - it should be a moz container
        parentMozContainer = parentnsWindow->GetMozContainerWidget();
        if (!parentMozContainer)
            return NS_ERROR_FAILURE;

        // get the toplevel window just in case someone needs to use it
        // for setting transients or whatever.
        topLevelParent =
            GTK_WINDOW(gtk_widget_get_toplevel(parentMozContainer));
    }

    // ok, create our windows
    switch (mWindowType) {
    case eWindowType_dialog:
    case eWindowType_popup:
    case eWindowType_toplevel:
    case eWindowType_invisible: {
        mIsTopLevel = true;

        // We only move a general managed toplevel window if someone has
        // actually placed the window somewhere.  If no placement has taken
        // place, we just let the window manager Do The Right Thing.
        //
        // Indicate that if we're shown, we at least need to have our size set.
        // If we get explicitly moved, the position will also be set.
        mNeedsResize = true;

        if (mWindowType == eWindowType_dialog) {
            mShell = gtk_window_new(GTK_WINDOW_TOPLEVEL);
            SetDefaultIcon();
            gtk_window_set_wmclass(GTK_WINDOW(mShell), "Dialog", 
                                   gdk_get_program_class());
            gtk_window_set_type_hint(GTK_WINDOW(mShell),
                                     GDK_WINDOW_TYPE_HINT_DIALOG);
            gtk_window_set_transient_for(GTK_WINDOW(mShell),
                                         topLevelParent);
        }
        else if (mWindowType == eWindowType_popup) {
            // With popup windows, we want to control their position, so don't
            // wait for the window manager to place them (which wouldn't
            // happen with override-redirect windows anyway).
            mNeedsMove = true;

            // Popups that are not noautohide are only temporary. The are used
            // for menus and the like and disappear when another window is used.
            // For most popups, use the standard GtkWindowType GTK_WINDOW_POPUP,
            // which will use a Window with the override-redirect attribute
            // (for temporary windows).
            // For long-lived windows, their stacking order is managed by the
            // window manager, as indicated by GTK_WINDOW_TOPLEVEL ...
            GtkWindowType type = aInitData->mNoAutoHide ?
                                     GTK_WINDOW_TOPLEVEL : GTK_WINDOW_POPUP;
            mShell = gtk_window_new(type);
            gtk_window_set_wmclass(GTK_WINDOW(mShell), "Popup",
                                   gdk_get_program_class());

            if (aInitData->mSupportTranslucency) {
                // We need to select an ARGB visual here instead of in
                // SetTransparencyMode() because it has to be done before the
                // widget is realized.  An ARGB visual is only useful if we
                // are on a compositing window manager.
                GdkScreen *screen = gtk_widget_get_screen(mShell);
                if (gdk_screen_is_composited(screen)) {
#if (MOZ_WIDGET_GTK == 2)
                    GdkColormap *colormap =
                        gdk_screen_get_rgba_colormap(screen);
                    gtk_widget_set_colormap(mShell, colormap);
#else
                    GdkVisual *visual = gdk_screen_get_rgba_visual(screen);
                    gtk_widget_set_visual(mShell, visual);
#endif
                }
            }
            if (aInitData->mNoAutoHide) {
                // ... but the window manager does not decorate this window,
                // nor provide a separate taskbar icon.
                if (mBorderStyle == eBorderStyle_default) {
                  gtk_window_set_decorated(GTK_WINDOW(mShell), FALSE);
                }
                else {
                  bool decorate = mBorderStyle & eBorderStyle_title;
                  gtk_window_set_decorated(GTK_WINDOW(mShell), decorate);
                  if (decorate) {
                    gtk_window_set_deletable(GTK_WINDOW(mShell), mBorderStyle & eBorderStyle_close);
                  }
                }
                gtk_window_set_skip_taskbar_hint(GTK_WINDOW(mShell), TRUE);
                // Element focus is managed by the parent window so the
                // WM_HINTS input field is set to False to tell the window
                // manager not to set input focus to this window ...
                gtk_window_set_accept_focus(GTK_WINDOW(mShell), FALSE);
#ifdef MOZ_X11
                // ... but when the window manager offers focus through
                // WM_TAKE_FOCUS, focus is requested on the parent window.
                gtk_widget_realize(mShell);
                gdk_window_add_filter(gtk_widget_get_window(mShell),
                                      popup_take_focus_filter, nullptr); 
#endif
            }

            GdkWindowTypeHint gtkTypeHint;
            if (aInitData->mIsDragPopup) {
                gtkTypeHint = GDK_WINDOW_TYPE_HINT_DND;
            }
            else {
                switch (aInitData->mPopupHint) {
                    case ePopupTypeMenu:
                        gtkTypeHint = GDK_WINDOW_TYPE_HINT_POPUP_MENU;
                        break;
                    case ePopupTypeTooltip:
                        gtkTypeHint = GDK_WINDOW_TYPE_HINT_TOOLTIP;
                        break;
                    default:
                        gtkTypeHint = GDK_WINDOW_TYPE_HINT_UTILITY;
                        break;
                }
            }
            gtk_window_set_type_hint(GTK_WINDOW(mShell), gtkTypeHint);

            if (topLevelParent) {
                gtk_window_set_transient_for(GTK_WINDOW(mShell),
                                            topLevelParent);
            }
        }
        else { // must be eWindowType_toplevel
            mShell = gtk_window_new(GTK_WINDOW_TOPLEVEL);
            SetDefaultIcon();
            gtk_window_set_wmclass(GTK_WINDOW(mShell), "Toplevel", 
                                   gdk_get_program_class());

            // each toplevel window gets its own window group
            GtkWindowGroup *group = gtk_window_group_new();
            gtk_window_group_add_window(group, GTK_WINDOW(mShell));
            g_object_unref(group);
        }

        // Prevent GtkWindow from painting a background to flicker.
        gtk_widget_set_app_paintable(mShell, TRUE);

        // Create a container to hold child windows and child GtkWidgets.
        GtkWidget *container = moz_container_new();
        mContainer = MOZ_CONTAINER(container);
        // Use mShell's window for drawing and events.
        gtk_widget_set_has_window(container, FALSE);
        eventWidget = mShell;
        gtk_widget_add_events(eventWidget, kEvents);
        gtk_container_add(GTK_CONTAINER(mShell), container);
        gtk_widget_realize(container);

        // make sure this is the focus widget in the container
        gtk_widget_show(container);
        gtk_widget_grab_focus(container);

        // the drawing window
        mGdkWindow = gtk_widget_get_window(mShell);

        if (mWindowType == eWindowType_popup) {
            // gdk does not automatically set the cursor for "temporary"
            // windows, which are what gtk uses for popups.

            mCursor = eCursor_wait; // force SetCursor to actually set the
                                    // cursor, even though our internal state
                                    // indicates that we already have the
                                    // standard cursor.
            SetCursor(eCursor_standard);

            if (aInitData->mNoAutoHide) {
                gint wmd = ConvertBorderStyles(mBorderStyle);
                if (wmd != -1)
                  gdk_window_set_decorations(gtk_widget_get_window(mShell), (GdkWMDecoration) wmd);
            }

            // If the popup ignores mouse events, set an empty input shape.
            if (aInitData->mMouseTransparent) {
#if (MOZ_WIDGET_GTK == 2)
              GdkRectangle rect = { 0, 0, 0, 0 };
              GdkRegion *region = gdk_region_rectangle(&rect);

              gdk_window_input_shape_combine_region(mGdkWindow, region, 0, 0);
              gdk_region_destroy(region);
#else
              cairo_rectangle_int_t rect = { 0, 0, 0, 0 };
              cairo_region_t *region = cairo_region_create_rectangle(&rect);

              gdk_window_input_shape_combine_region(mGdkWindow, region, 0, 0);
              cairo_region_destroy(region);
#endif
            }
        }
    }
        break;
    case eWindowType_plugin:
    case eWindowType_plugin_ipc_chrome:
    case eWindowType_plugin_ipc_content:
    case eWindowType_child: {
        if (parentMozContainer) {
            mGdkWindow = CreateGdkWindow(parentGdkWindow, parentMozContainer);
            mHasMappedToplevel = parentnsWindow->mHasMappedToplevel;
        }
        else if (parentGtkContainer) {
            // This MozContainer has its own window for drawing and receives
            // events because there is no mShell widget (corresponding to this
            // nsWindow).
            GtkWidget *container = moz_container_new();
            mContainer = MOZ_CONTAINER(container);
            eventWidget = container;
            gtk_widget_add_events(eventWidget, kEvents);
            gtk_container_add(parentGtkContainer, container);
            gtk_widget_realize(container);

            mGdkWindow = gtk_widget_get_window(container);
        }
        else {
            NS_WARNING("Warning: tried to create a new child widget with no parent!");
            return NS_ERROR_FAILURE;
        }
    }
        break;
    default:
        break;
    }

    // label the drawing window with this object so we can find our way home
    g_object_set_data(G_OBJECT(mGdkWindow), "nsWindow", this);

    if (mContainer)
        g_object_set_data(G_OBJECT(mContainer), "nsWindow", this);

    if (mShell)
        g_object_set_data(G_OBJECT(mShell), "nsWindow", this);

    // attach listeners for events
    if (mShell) {
        g_signal_connect(mShell, "configure_event",
                         G_CALLBACK(configure_event_cb), nullptr);
        g_signal_connect(mShell, "delete_event",
                         G_CALLBACK(delete_event_cb), nullptr);
        g_signal_connect(mShell, "window_state_event",
                         G_CALLBACK(window_state_event_cb), nullptr);

        GtkSettings* default_settings = gtk_settings_get_default();
        g_signal_connect_after(default_settings,
                               "notify::gtk-theme-name",
                               G_CALLBACK(theme_changed_cb), this);
        g_signal_connect_after(default_settings,
                               "notify::gtk-font-name",
                               G_CALLBACK(theme_changed_cb), this);
    }

    if (mContainer) {
        // Widget signals
        g_signal_connect(mContainer, "unrealize",
                         G_CALLBACK(container_unrealize_cb), nullptr);
        g_signal_connect_after(mContainer, "size_allocate",
                               G_CALLBACK(size_allocate_cb), nullptr);
        g_signal_connect(mContainer, "hierarchy-changed",
                         G_CALLBACK(hierarchy_changed_cb), nullptr);
        // Initialize mHasMappedToplevel.
        hierarchy_changed_cb(GTK_WIDGET(mContainer), nullptr);
        // Expose, focus, key, and drag events are sent even to GTK_NO_WINDOW
        // widgets.
#if (MOZ_WIDGET_GTK == 2)
        g_signal_connect(mContainer, "expose_event",
                         G_CALLBACK(expose_event_cb), nullptr);
#else
        g_signal_connect(G_OBJECT(mContainer), "draw",
                         G_CALLBACK(expose_event_cb), nullptr);
#endif
        g_signal_connect(mContainer, "focus_in_event",
                         G_CALLBACK(focus_in_event_cb), nullptr);
        g_signal_connect(mContainer, "focus_out_event",
                         G_CALLBACK(focus_out_event_cb), nullptr);
        g_signal_connect(mContainer, "key_press_event",
                         G_CALLBACK(key_press_event_cb), nullptr);
        g_signal_connect(mContainer, "key_release_event",
                         G_CALLBACK(key_release_event_cb), nullptr);

        gtk_drag_dest_set((GtkWidget *)mContainer,
                          (GtkDestDefaults)0,
                          nullptr,
                          0,
                          (GdkDragAction)0);

        g_signal_connect(mContainer, "drag_motion",
                         G_CALLBACK(drag_motion_event_cb), nullptr);
        g_signal_connect(mContainer, "drag_leave",
                         G_CALLBACK(drag_leave_event_cb), nullptr);
        g_signal_connect(mContainer, "drag_drop",
                         G_CALLBACK(drag_drop_event_cb), nullptr);
        g_signal_connect(mContainer, "drag_data_received",
                         G_CALLBACK(drag_data_received_event_cb), nullptr);

        GtkWidget *widgets[] = { GTK_WIDGET(mContainer), mShell };
        for (size_t i = 0; i < ArrayLength(widgets) && widgets[i]; ++i) {
            // Visibility events are sent to the owning widget of the relevant
            // window but do not propagate to parent widgets so connect on
            // mShell (if it exists) as well as mContainer.
            g_signal_connect(widgets[i], "visibility-notify-event",
                             G_CALLBACK(visibility_notify_event_cb), nullptr);
            // Similarly double buffering is controlled by the window's owning
            // widget.  Disable double buffering for painting directly to the
            // X Window.
            gtk_widget_set_double_buffered(widgets[i], FALSE);
        }

        // We create input contexts for all containers, except for
        // toplevel popup windows
        if (mWindowType != eWindowType_popup) {
            mIMModule = new nsGtkIMModule(this);
        }
    } else if (!mIMModule) {
        nsWindow *container = GetContainerWindow();
        if (container) {
            mIMModule = container->mIMModule;
        }
    }

    if (eventWidget) {
#if (MOZ_WIDGET_GTK == 2)
        // Don't let GTK mess with the shapes of our GdkWindows
        GTK_PRIVATE_SET_FLAG(eventWidget, GTK_HAS_SHAPE_MASK);
#endif

        // These events are sent to the owning widget of the relevant window
        // and propagate up to the first widget that handles the events, so we
        // need only connect on mShell, if it exists, to catch events on its
        // window and windows of mContainer.
        g_signal_connect(eventWidget, "enter-notify-event",
                         G_CALLBACK(enter_notify_event_cb), nullptr);
        g_signal_connect(eventWidget, "leave-notify-event",
                         G_CALLBACK(leave_notify_event_cb), nullptr);
        g_signal_connect(eventWidget, "motion-notify-event",
                         G_CALLBACK(motion_notify_event_cb), nullptr);
        g_signal_connect(eventWidget, "button-press-event",
                         G_CALLBACK(button_press_event_cb), nullptr);
        g_signal_connect(eventWidget, "button-release-event",
                         G_CALLBACK(button_release_event_cb), nullptr);
        g_signal_connect(eventWidget, "scroll-event",
                         G_CALLBACK(scroll_event_cb), nullptr);
    }

    LOG(("nsWindow [%p]\n", (void *)this));
    if (mShell) {
        LOG(("\tmShell %p mContainer %p mGdkWindow %p 0x%lx\n",
             mShell, mContainer, mGdkWindow,
             gdk_x11_window_get_xid(mGdkWindow)));
    } else if (mContainer) {
        LOG(("\tmContainer %p mGdkWindow %p\n", mContainer, mGdkWindow));
    }
    else if (mGdkWindow) {
        LOG(("\tmGdkWindow %p parent %p\n",
             mGdkWindow, gdk_window_get_parent(mGdkWindow)));
    }

    // resize so that everything is set to the right dimensions
    if (!mIsTopLevel)
        Resize(mBounds.x, mBounds.y, mBounds.width, mBounds.height, false);

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::SetWindowClass(const nsAString &xulWinType)
{
  if (!mShell)
    return NS_ERROR_FAILURE;

  const char *res_class = gdk_get_program_class();
  if (!res_class)
    return NS_ERROR_FAILURE;
  
  char *res_name = ToNewCString(xulWinType);
  if (!res_name)
    return NS_ERROR_OUT_OF_MEMORY;

  const char *role = nullptr;

  // Parse res_name into a name and role. Characters other than
  // [A-Za-z0-9_-] are converted to '_'. Anything after the first
  // colon is assigned to role; if there's no colon, assign the
  // whole thing to both role and res_name.
  for (char *c = res_name; *c; c++) {
    if (':' == *c) {
      *c = 0;
      role = c + 1;
    }
    else if (!isascii(*c) || (!isalnum(*c) && ('_' != *c) && ('-' != *c)))
      *c = '_';
  }
  res_name[0] = toupper(res_name[0]);
  if (!role) role = res_name;

  GdkWindow *shellWindow = gtk_widget_get_window(GTK_WIDGET(mShell));
  gdk_window_set_role(shellWindow, role);

#ifdef MOZ_X11
  XClassHint *class_hint = XAllocClassHint();
  if (!class_hint) {
    nsMemory::Free(res_name);
    return NS_ERROR_OUT_OF_MEMORY;
  }
  class_hint->res_name = res_name;
  class_hint->res_class = const_cast<char*>(res_class);

  // Can't use gtk_window_set_wmclass() for this; it prints
  // a warning & refuses to make the change.
  XSetClassHint(GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
                gdk_x11_window_get_xid(shellWindow),
                class_hint);
  XFree(class_hint);
#endif /* MOZ_X11 */

  nsMemory::Free(res_name);

  return NS_OK;
}

void
nsWindow::NativeResize(int32_t aWidth, int32_t aHeight, bool    aRepaint)
{
    LOG(("nsWindow::NativeResize [%p] %d %d\n", (void *)this,
         aWidth, aHeight));

    // clear our resize flag
    mNeedsResize = false;

    if (mIsTopLevel) {
        gtk_window_resize(GTK_WINDOW(mShell), aWidth, aHeight);
    }
    else if (mContainer) {
        GtkWidget *widget = GTK_WIDGET(mContainer);
        GtkAllocation allocation, prev_allocation;
        gtk_widget_get_allocation(widget, &prev_allocation);
        allocation.x = prev_allocation.x;
        allocation.y = prev_allocation.y;
        allocation.width = aWidth;
        allocation.height = aHeight;
        gtk_widget_size_allocate(widget, &allocation);
    }
    else if (mGdkWindow) {
        gdk_window_resize(mGdkWindow, aWidth, aHeight);
    }
}

void
nsWindow::NativeResize(int32_t aX, int32_t aY,
                       int32_t aWidth, int32_t aHeight,
                       bool    aRepaint)
{
    mNeedsResize = false;
    mNeedsMove = false;

    LOG(("nsWindow::NativeResize [%p] %d %d %d %d\n", (void *)this,
         aX, aY, aWidth, aHeight));

    if (mIsTopLevel) {
        // aX and aY give the position of the window manager frame top-left.
        gtk_window_move(GTK_WINDOW(mShell), aX, aY);
        // This sets the client window size.
        gtk_window_resize(GTK_WINDOW(mShell), aWidth, aHeight);
    }
    else if (mContainer) {
        GtkAllocation allocation;
        allocation.x = aX;
        allocation.y = aY;
        allocation.width = aWidth;
        allocation.height = aHeight;
        gtk_widget_size_allocate(GTK_WIDGET(mContainer), &allocation);
    }
    else if (mGdkWindow) {
        gdk_window_move_resize(mGdkWindow, aX, aY, aWidth, aHeight);
    }
}

void
nsWindow::NativeShow(bool aAction)
{
    if (aAction) {
        // unset our flag now that our window has been shown
        mNeedsShow = false;

        if (mIsTopLevel) {
            // Set up usertime/startupID metadata for the created window.
            if (mWindowType != eWindowType_invisible) {
                SetUserTimeAndStartupIDForActivatedWindow(mShell);
            }

            gtk_widget_show(mShell);
        }
        else if (mContainer) {
            gtk_widget_show(GTK_WIDGET(mContainer));
        }
        else if (mGdkWindow) {
            gdk_window_show_unraised(mGdkWindow);
        }
    }
    else {
        if (mIsTopLevel) {
            gtk_widget_hide(GTK_WIDGET(mShell));

            ClearTransparencyBitmap(); // Release some resources
        }
        else if (mContainer) {
            gtk_widget_hide(GTK_WIDGET(mContainer));
        }
        else if (mGdkWindow) {
            gdk_window_hide(mGdkWindow);
        }
    }
}

void
nsWindow::SetHasMappedToplevel(bool aState)
{
    // Even when aState == mHasMappedToplevel (as when this method is called
    // from Show()), child windows need to have their state checked, so don't
    // return early.
    bool oldState = mHasMappedToplevel;
    mHasMappedToplevel = aState;

    // mHasMappedToplevel is not updated for children of windows that are
    // hidden; GDK knows not to send expose events for these windows.  The
    // state is recorded on the hidden window itself, but, for child trees of
    // hidden windows, their state essentially becomes disconnected from their
    // hidden parent.  When the hidden parent gets shown, the child trees are
    // reconnected, and the state of the window being shown can be easily
    // propagated.
    if (!mIsShown || !mGdkWindow)
        return;

    if (aState && !oldState && !mIsFullyObscured) {
        // GDK_EXPOSE events have been ignored but the window is now visible,
        // so make sure GDK doesn't think that the window has already been
        // painted.
        gdk_window_invalidate_rect(mGdkWindow, nullptr, FALSE);

        // Check that a grab didn't fail due to the window not being
        // viewable.
        EnsureGrabs();
    }

    for (GList *children = gdk_window_peek_children(mGdkWindow);
         children;
         children = children->next) {
        GdkWindow *gdkWin = GDK_WINDOW(children->data);
        nsWindow *child = get_window_for_gdk_window(gdkWin);

        if (child && child->mHasMappedToplevel != aState) {
            child->SetHasMappedToplevel(aState);
        }
    }
}

nsIntSize
nsWindow::GetSafeWindowSize(nsIntSize aSize)
{
    // The X protocol uses CARD32 for window sizes, but the server (1.11.3)
    // reads it as CARD16.  Sizes of pixmaps, used for drawing, are (unsigned)
    // CARD16 in the protocol, but the server's ProcCreatePixmap returns
    // BadAlloc if dimensions cannot be represented by signed shorts.
    nsIntSize result = aSize;
    const int32_t kInt16Max = 32767;
    if (result.width > kInt16Max) {
        result.width = kInt16Max;
    }
    if (result.height > kInt16Max) {
        result.height = kInt16Max;
    }
    return result;
}

void
nsWindow::EnsureGrabs(void)
{
    if (mRetryPointerGrab)
        GrabPointer(sRetryGrabTime);
}

void
nsWindow::CleanLayerManagerRecursive(void) {
    if (mLayerManager) {
        mLayerManager->Destroy();
        mLayerManager = nullptr;
    }

    DestroyCompositor();

    GList* children = gdk_window_peek_children(mGdkWindow);
    for (GList* list = children; list; list = list->next) {
        nsWindow* window = get_window_for_gdk_window(GDK_WINDOW(list->data));
        if (window) {
            window->CleanLayerManagerRecursive();
        }
    }
}

void
nsWindow::SetTransparencyMode(nsTransparencyMode aMode)
{
    if (!mShell) {
        // Pass the request to the toplevel window
        GtkWidget *topWidget = GetToplevelWidget();
        if (!topWidget)
            return;

        nsWindow *topWindow = get_window_for_gtk_widget(topWidget);
        if (!topWindow)
            return;

        topWindow->SetTransparencyMode(aMode);
        return;
    }
    bool isTransparent = aMode == eTransparencyTransparent;

    if (mIsTransparent == isTransparent)
        return;

    if (!isTransparent) {
        ClearTransparencyBitmap();
    } // else the new default alpha values are "all 1", so we don't
    // need to change anything yet

    mIsTransparent = isTransparent;

    // Need to clean our LayerManager up while still alive because
    // we don't want to use layers acceleration on shaped windows
    CleanLayerManagerRecursive();
}

nsTransparencyMode
nsWindow::GetTransparencyMode()
{
    if (!mShell) {
        // Pass the request to the toplevel window
        GtkWidget *topWidget = GetToplevelWidget();
        if (!topWidget) {
            return eTransparencyOpaque;
        }

        nsWindow *topWindow = get_window_for_gtk_widget(topWidget);
        if (!topWindow) {
            return eTransparencyOpaque;
        }

        return topWindow->GetTransparencyMode();
    }

    return mIsTransparent ? eTransparencyTransparent : eTransparencyOpaque;
}

nsresult
nsWindow::ConfigureChildren(const nsTArray<Configuration>& aConfigurations)
{
    // If this is a remotely updated widget we receive clipping, position, and
    // size information from a source other than our owner. Don't let our parent
    // update this information.
    if (mWindowType == eWindowType_plugin_ipc_chrome) {
      return NS_OK;
    }

    for (uint32_t i = 0; i < aConfigurations.Length(); ++i) {
        const Configuration& configuration = aConfigurations[i];
        nsWindow* w = static_cast<nsWindow*>(configuration.mChild);
        NS_ASSERTION(w->GetParent() == this,
                     "Configured widget is not a child");
        w->SetWindowClipRegion(configuration.mClipRegion, true);
        if (w->mBounds.Size() != configuration.mBounds.Size()) {
            w->Resize(configuration.mBounds.x, configuration.mBounds.y,
                      configuration.mBounds.width, configuration.mBounds.height,
                      true);
        } else if (w->mBounds.TopLeft() != configuration.mBounds.TopLeft()) {
            w->Move(configuration.mBounds.x, configuration.mBounds.y);
        } 
        w->SetWindowClipRegion(configuration.mClipRegion, false);
    }
    return NS_OK;
}

static pixman_box32
ToPixmanBox(const nsIntRect& aRect)
{
    pixman_box32_t result;
    result.x1 = aRect.x;
    result.y1 = aRect.y;
    result.x2 = aRect.XMost();
    result.y2 = aRect.YMost();
    return result;
}

static nsIntRect
ToIntRect(const pixman_box32& aBox)
{
    nsIntRect result;
    result.x = aBox.x1;
    result.y = aBox.y1;
    result.width = aBox.x2 - aBox.x1;
    result.height = aBox.y2 - aBox.y1;
    return result;
}

static void
InitRegion(pixman_region32* aRegion,
           const nsTArray<nsIntRect>& aRects)
{
    nsAutoTArray<pixman_box32,10> rects;
    rects.SetCapacity(aRects.Length());
    for (uint32_t i = 0; i < aRects.Length (); ++i) {
        if (!aRects[i].IsEmpty()) {
            rects.AppendElement(ToPixmanBox(aRects[i]));
        }
    }

    pixman_region32_init_rects(aRegion,
                               rects.Elements(), rects.Length());
}

static void
GetIntRects(pixman_region32& aRegion, nsTArray<nsIntRect>* aRects)
{
    int nRects;
    pixman_box32* boxes = pixman_region32_rectangles(&aRegion, &nRects);
    aRects->SetCapacity(aRects->Length() + nRects);
    for (int i = 0; i < nRects; ++i) {
        aRects->AppendElement(ToIntRect(boxes[i]));
    }
}

nsresult
nsWindow::SetWindowClipRegion(const nsTArray<nsIntRect>& aRects,
                              bool aIntersectWithExisting)
{
    const nsTArray<nsIntRect>* newRects = &aRects;

    nsAutoTArray<nsIntRect,1> intersectRects;
    if (aIntersectWithExisting) {
        nsAutoTArray<nsIntRect,1> existingRects;
        GetWindowClipRegion(&existingRects);

        nsAutoRef<pixman_region32> existingRegion;
        InitRegion(&existingRegion, existingRects);
        nsAutoRef<pixman_region32> newRegion;
        InitRegion(&newRegion, aRects);
        nsAutoRef<pixman_region32> intersectRegion;
        pixman_region32_init(&intersectRegion);
        pixman_region32_intersect(&intersectRegion,
                                  &newRegion, &existingRegion);

        // If mClipRects is null we haven't set a clip rect yet, so we
        // need to set the clip even if it is equal.
        if (mClipRects &&
            pixman_region32_equal(&intersectRegion, &existingRegion)) {
            return NS_OK;
        }

        if (!pixman_region32_equal(&intersectRegion, &newRegion)) {
            GetIntRects(intersectRegion, &intersectRects);
            newRects = &intersectRects;
        }
    }

    if (IsWindowClipRegionEqual(*newRects))
        return NS_OK;

    StoreWindowClipRegion(*newRects);

    if (!mGdkWindow)
        return NS_OK;

#if (MOZ_WIDGET_GTK == 2)
    GdkRegion *region = gdk_region_new(); // aborts on OOM
    for (uint32_t i = 0; i < newRects->Length(); ++i) {
        const nsIntRect& r = newRects->ElementAt(i);
        GdkRectangle rect = { r.x, r.y, r.width, r.height };
        gdk_region_union_with_rect(region, &rect);
    }

    gdk_window_shape_combine_region(mGdkWindow, region, 0, 0);
    gdk_region_destroy(region);
#else
    cairo_region_t *region = cairo_region_create();
    for (uint32_t i = 0; i < newRects->Length(); ++i) {
        const nsIntRect& r = newRects->ElementAt(i);
        cairo_rectangle_int_t rect = { r.x, r.y, r.width, r.height };
        cairo_region_union_rectangle(region, &rect);
    }

    gdk_window_shape_combine_region(mGdkWindow, region, 0, 0);
    cairo_region_destroy(region);
#endif

    return NS_OK;
}

void
nsWindow::ResizeTransparencyBitmap()
{
    if (!mTransparencyBitmap)
        return;

    if (mBounds.width == mTransparencyBitmapWidth &&
        mBounds.height == mTransparencyBitmapHeight)
        return;

    int32_t newRowBytes = GetBitmapStride(mBounds.width);
    int32_t newSize = newRowBytes * mBounds.height;
    gchar* newBits = new gchar[newSize];
    // fill new mask with "transparent", first
    memset(newBits, 0, newSize);

    // Now copy the intersection of the old and new areas into the new mask
    int32_t copyWidth = std::min(mBounds.width, mTransparencyBitmapWidth);
    int32_t copyHeight = std::min(mBounds.height, mTransparencyBitmapHeight);
    int32_t oldRowBytes = GetBitmapStride(mTransparencyBitmapWidth);
    int32_t copyBytes = GetBitmapStride(copyWidth);

    int32_t i;
    gchar* fromPtr = mTransparencyBitmap;
    gchar* toPtr = newBits;
    for (i = 0; i < copyHeight; i++) {
        memcpy(toPtr, fromPtr, copyBytes);
        fromPtr += oldRowBytes;
        toPtr += newRowBytes;
    }

    delete[] mTransparencyBitmap;
    mTransparencyBitmap = newBits;
    mTransparencyBitmapWidth = mBounds.width;
    mTransparencyBitmapHeight = mBounds.height;
}

static bool
ChangedMaskBits(gchar* aMaskBits, int32_t aMaskWidth, int32_t aMaskHeight,
        const nsIntRect& aRect, uint8_t* aAlphas, int32_t aStride)
{
    int32_t x, y, xMax = aRect.XMost(), yMax = aRect.YMost();
    int32_t maskBytesPerRow = GetBitmapStride(aMaskWidth);
    for (y = aRect.y; y < yMax; y++) {
        gchar* maskBytes = aMaskBits + y*maskBytesPerRow;
        uint8_t* alphas = aAlphas;
        for (x = aRect.x; x < xMax; x++) {
            bool newBit = *alphas > 0x7f;
            alphas++;

            gchar maskByte = maskBytes[x >> 3];
            bool maskBit = (maskByte & (1 << (x & 7))) != 0;

            if (maskBit != newBit) {
                return true;
            }
        }
        aAlphas += aStride;
    }

    return false;
}

static
void UpdateMaskBits(gchar* aMaskBits, int32_t aMaskWidth, int32_t aMaskHeight,
        const nsIntRect& aRect, uint8_t* aAlphas, int32_t aStride)
{
    int32_t x, y, xMax = aRect.XMost(), yMax = aRect.YMost();
    int32_t maskBytesPerRow = GetBitmapStride(aMaskWidth);
    for (y = aRect.y; y < yMax; y++) {
        gchar* maskBytes = aMaskBits + y*maskBytesPerRow;
        uint8_t* alphas = aAlphas;
        for (x = aRect.x; x < xMax; x++) {
            bool newBit = *alphas > 0x7f;
            alphas++;

            gchar mask = 1 << (x & 7);
            gchar maskByte = maskBytes[x >> 3];
            // Note: '-newBit' turns 0 into 00...00 and 1 into 11...11
            maskBytes[x >> 3] = (maskByte & ~mask) | (-newBit & mask);
        }
        aAlphas += aStride;
    }
}

void
nsWindow::ApplyTransparencyBitmap()
{
#ifdef MOZ_X11
    // We use X11 calls where possible, because GDK handles expose events
    // for shaped windows in a way that's incompatible with us (Bug 635903).
    // It doesn't occur when the shapes are set through X.
    GdkWindow *shellWindow = gtk_widget_get_window(mShell);
    Display* xDisplay = GDK_WINDOW_XDISPLAY(shellWindow);
    Window xDrawable = GDK_WINDOW_XID(shellWindow);
    Pixmap maskPixmap = XCreateBitmapFromData(xDisplay,
                                              xDrawable,
                                              mTransparencyBitmap,
                                              mTransparencyBitmapWidth,
                                              mTransparencyBitmapHeight);
    XShapeCombineMask(xDisplay, xDrawable,
                      ShapeBounding, 0, 0,
                      maskPixmap, ShapeSet);
    XFreePixmap(xDisplay, maskPixmap);
#else
#if (MOZ_WIDGET_GTK == 2)
    gtk_widget_reset_shapes(mShell);
    GdkBitmap* maskBitmap = gdk_bitmap_create_from_data(gtk_widget_get_window(mShell),
            mTransparencyBitmap,
            mTransparencyBitmapWidth, mTransparencyBitmapHeight);
    if (!maskBitmap)
        return;

    gtk_widget_shape_combine_mask(mShell, maskBitmap, 0, 0);
    g_object_unref(maskBitmap);
#else
    cairo_surface_t *maskBitmap;
    maskBitmap = cairo_image_surface_create_for_data((unsigned char*)mTransparencyBitmap, 
                                                     CAIRO_FORMAT_A1, 
                                                     mTransparencyBitmapWidth, 
                                                     mTransparencyBitmapHeight,
                                                     GetBitmapStride(mTransparencyBitmapWidth));
    if (!maskBitmap)
        return;

    cairo_region_t * maskRegion = gdk_cairo_region_create_from_surface(maskBitmap);
    gtk_widget_shape_combine_region(mShell, maskRegion);
    cairo_region_destroy(maskRegion);
    cairo_surface_destroy(maskBitmap);
#endif // MOZ_WIDGET_GTK2
#endif // MOZ_X11
}

void
nsWindow::ClearTransparencyBitmap()
{
    if (!mTransparencyBitmap)
        return;

    delete[] mTransparencyBitmap;
    mTransparencyBitmap = nullptr;
    mTransparencyBitmapWidth = 0;
    mTransparencyBitmapHeight = 0;

    if (!mShell)
        return;

#ifdef MOZ_X11
    GdkWindow *window = gtk_widget_get_window(mShell);
    if (!window)
        return;

    Display* xDisplay = GDK_WINDOW_XDISPLAY(window);
    Window xWindow = gdk_x11_window_get_xid(window);

    XShapeCombineMask(xDisplay, xWindow, ShapeBounding, 0, 0, None, ShapeSet);
#endif
}

nsresult
nsWindow::UpdateTranslucentWindowAlphaInternal(const nsIntRect& aRect,
                                               uint8_t* aAlphas, int32_t aStride)
{
    if (!mShell) {
        // Pass the request to the toplevel window
        GtkWidget *topWidget = GetToplevelWidget();
        if (!topWidget)
            return NS_ERROR_FAILURE;

        nsWindow *topWindow = get_window_for_gtk_widget(topWidget);
        if (!topWindow)
            return NS_ERROR_FAILURE;

        return topWindow->UpdateTranslucentWindowAlphaInternal(aRect, aAlphas, aStride);
    }

    NS_ASSERTION(mIsTransparent, "Window is not transparent");

    if (mTransparencyBitmap == nullptr) {
        int32_t size = GetBitmapStride(mBounds.width)*mBounds.height;
        mTransparencyBitmap = new gchar[size];
        memset(mTransparencyBitmap, 255, size);
        mTransparencyBitmapWidth = mBounds.width;
        mTransparencyBitmapHeight = mBounds.height;
    } else {
        ResizeTransparencyBitmap();
    }

    nsIntRect rect;
    rect.IntersectRect(aRect, nsIntRect(0, 0, mBounds.width, mBounds.height));

    if (!ChangedMaskBits(mTransparencyBitmap, mBounds.width, mBounds.height,
                         rect, aAlphas, aStride))
        // skip the expensive stuff if the mask bits haven't changed; hopefully
        // this is the common case
        return NS_OK;

    UpdateMaskBits(mTransparencyBitmap, mBounds.width, mBounds.height,
                   rect, aAlphas, aStride);

    if (!mNeedsShow) {
        ApplyTransparencyBitmap();
    }
    return NS_OK;
}

void
nsWindow::GrabPointer(guint32 aTime)
{
    LOG(("GrabPointer time=0x%08x retry=%d\n",
         (unsigned int)aTime, mRetryPointerGrab));

    mRetryPointerGrab = false;
    sRetryGrabTime = aTime;

    // If the window isn't visible, just set the flag to retry the
    // grab.  When this window becomes visible, the grab will be
    // retried.
    if (!mHasMappedToplevel || mIsFullyObscured) {
        LOG(("GrabPointer: window not visible\n"));
        mRetryPointerGrab = true;
        return;
    }

    if (!mGdkWindow)
        return;

    gint retval;
    retval = gdk_pointer_grab(mGdkWindow, TRUE,
                              (GdkEventMask)(GDK_BUTTON_PRESS_MASK |
                                             GDK_BUTTON_RELEASE_MASK |
                                             GDK_ENTER_NOTIFY_MASK |
                                             GDK_LEAVE_NOTIFY_MASK |
                                             GDK_POINTER_MOTION_MASK),
                              (GdkWindow *)nullptr, nullptr, aTime);

    if (retval == GDK_GRAB_NOT_VIEWABLE) {
        LOG(("GrabPointer: window not viewable; will retry\n"));
        mRetryPointerGrab = true;
    } else if (retval != GDK_GRAB_SUCCESS) {
        LOG(("GrabPointer: pointer grab failed: %i\n", retval));
        // A failed grab indicates that another app has grabbed the pointer.
        // Check for rollup now, because, without the grab, we likely won't
        // get subsequent button press events.
        CheckForRollup(0, 0, false, true);
    }
}

void
nsWindow::ReleaseGrabs(void)
{
    LOG(("ReleaseGrabs\n"));

    mRetryPointerGrab = false;
    gdk_pointer_ungrab(GDK_CURRENT_TIME);
}

GtkWidget *
nsWindow::GetToplevelWidget()
{
    if (mShell) {
        return mShell;
    }

    GtkWidget *widget = GetMozContainerWidget();
    if (!widget)
        return nullptr;

    return gtk_widget_get_toplevel(widget);
}

GtkWidget *
nsWindow::GetMozContainerWidget()
{
    if (!mGdkWindow)
        return nullptr;

    if (mContainer)
        return GTK_WIDGET(mContainer);

    GtkWidget *owningWidget =
        get_gtk_widget_for_gdk_window(mGdkWindow);
    return owningWidget;
}

nsWindow *
nsWindow::GetContainerWindow()
{
    GtkWidget *owningWidget = GetMozContainerWidget();
    if (!owningWidget)
        return nullptr;

    nsWindow *window = get_window_for_gtk_widget(owningWidget);
    NS_ASSERTION(window, "No nsWindow for container widget");
    return window;
}

void
nsWindow::SetUrgencyHint(GtkWidget *top_window, bool state)
{
    if (!top_window)
        return;
        
    gdk_window_set_urgency_hint(gtk_widget_get_window(top_window), state);
}

void *
nsWindow::SetupPluginPort(void)
{
    if (!mGdkWindow)
        return nullptr;

    if (gdk_window_is_destroyed(mGdkWindow) == TRUE)
        return nullptr;

    Window window = gdk_x11_window_get_xid(mGdkWindow);
    
    // we have to flush the X queue here so that any plugins that
    // might be running on separate X connections will be able to use
    // this window in case it was just created
#ifdef MOZ_X11
    XWindowAttributes xattrs;    
    Display *display = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
    XGetWindowAttributes(display, window, &xattrs);
    XSelectInput (display, window,
                  xattrs.your_event_mask |
                  SubstructureNotifyMask);

    gdk_window_add_filter(mGdkWindow, plugin_window_filter_func, this);

    XSync(display, False);
#endif /* MOZ_X11 */
    
    return (void *)window;
}

void
nsWindow::SetDefaultIcon(void)
{
    SetIcon(NS_LITERAL_STRING("default"));
}

void
nsWindow::SetPluginType(PluginType aPluginType)
{
    mPluginType = aPluginType;
}

#ifdef MOZ_X11
void
nsWindow::SetNonXEmbedPluginFocus()
{
    if (gPluginFocusWindow == this || mPluginType!=PluginType_NONXEMBED) {
        return;
    }

    if (gPluginFocusWindow) {
        nsRefPtr<nsWindow> kungFuDeathGrip = gPluginFocusWindow;
        gPluginFocusWindow->LoseNonXEmbedPluginFocus();
    }

    LOGFOCUS(("nsWindow::SetNonXEmbedPluginFocus\n"));

    Window curFocusWindow;
    int focusState;
    
    GdkDisplay *gdkDisplay = gdk_window_get_display(mGdkWindow);
    XGetInputFocus(gdk_x11_display_get_xdisplay(gdkDisplay),
                   &curFocusWindow,
                   &focusState);

    LOGFOCUS(("\t curFocusWindow=%p\n", curFocusWindow));

    GdkWindow* toplevel = gdk_window_get_toplevel(mGdkWindow);
#if (MOZ_WIDGET_GTK == 2)
    GdkWindow *gdkfocuswin = gdk_window_lookup(curFocusWindow);
#else
    GdkWindow *gdkfocuswin = gdk_x11_window_lookup_for_display(gdkDisplay,
                                                               curFocusWindow);
#endif

    // lookup with the focus proxy window is supposed to get the
    // same GdkWindow as toplevel. If the current focused window
    // is not the focus proxy, we return without any change.
    if (gdkfocuswin != toplevel) {
        return;
    }

    // switch the focus from the focus proxy to the plugin window
    mOldFocusWindow = curFocusWindow;
    XRaiseWindow(GDK_WINDOW_XDISPLAY(mGdkWindow),
                 gdk_x11_window_get_xid(mGdkWindow));
    gdk_error_trap_push();
    XSetInputFocus(GDK_WINDOW_XDISPLAY(mGdkWindow),
                   gdk_x11_window_get_xid(mGdkWindow),
                   RevertToNone,
                   CurrentTime);
    gdk_flush();
#if (MOZ_WIDGET_GTK == 3)
    gdk_error_trap_pop_ignored();
#else
    gdk_error_trap_pop();
#endif
    gPluginFocusWindow = this;
    gdk_window_add_filter(nullptr, plugin_client_message_filter, this);

    LOGFOCUS(("nsWindow::SetNonXEmbedPluginFocus oldfocus=%p new=%p\n",
              mOldFocusWindow, gdk_x11_window_get_xid(mGdkWindow)));
}

void
nsWindow::LoseNonXEmbedPluginFocus()
{
    LOGFOCUS(("nsWindow::LoseNonXEmbedPluginFocus\n"));

    // This method is only for the nsWindow which contains a
    // Non-XEmbed plugin, for example, JAVA plugin.
    if (gPluginFocusWindow != this || mPluginType!=PluginType_NONXEMBED) {
        return;
    }

    Window curFocusWindow;
    int focusState;

    XGetInputFocus(GDK_WINDOW_XDISPLAY(mGdkWindow),
                   &curFocusWindow,
                   &focusState);

    // we only switch focus between plugin window and focus proxy. If the
    // current focused window is not the plugin window, just removing the
    // event filter that blocks the WM_TAKE_FOCUS is enough. WM and gtk2
    // will take care of the focus later.
    if (!curFocusWindow ||
        curFocusWindow == gdk_x11_window_get_xid(mGdkWindow)) {

        gdk_error_trap_push();
        XRaiseWindow(GDK_WINDOW_XDISPLAY(mGdkWindow),
                     mOldFocusWindow);
        XSetInputFocus(GDK_WINDOW_XDISPLAY(mGdkWindow),
                       mOldFocusWindow,
                       RevertToParent,
                       CurrentTime);
        gdk_flush();
#if (MOZ_WIDGET_GTK == 3)
        gdk_error_trap_pop_ignored();
#else
        gdk_error_trap_pop();
#endif
    }
    gPluginFocusWindow = nullptr;
    mOldFocusWindow = 0;
    gdk_window_remove_filter(nullptr, plugin_client_message_filter, this);

    LOGFOCUS(("nsWindow::LoseNonXEmbedPluginFocus end\n"));
}
#endif /* MOZ_X11 */

gint
nsWindow::ConvertBorderStyles(nsBorderStyle aStyle)
{
    gint w = 0;

    if (aStyle == eBorderStyle_default)
        return -1;

    // note that we don't handle eBorderStyle_close yet
    if (aStyle & eBorderStyle_all)
        w |= GDK_DECOR_ALL;
    if (aStyle & eBorderStyle_border)
        w |= GDK_DECOR_BORDER;
    if (aStyle & eBorderStyle_resizeh)
        w |= GDK_DECOR_RESIZEH;
    if (aStyle & eBorderStyle_title)
        w |= GDK_DECOR_TITLE;
    if (aStyle & eBorderStyle_menu)
        w |= GDK_DECOR_MENU;
    if (aStyle & eBorderStyle_minimize)
        w |= GDK_DECOR_MINIMIZE;
    if (aStyle & eBorderStyle_maximize)
        w |= GDK_DECOR_MAXIMIZE;

    return w;
}

NS_IMETHODIMP
nsWindow::MakeFullScreen(bool aFullScreen, nsIScreen* aTargetScreen)
{
    LOG(("nsWindow::MakeFullScreen [%p] aFullScreen %d\n",
         (void *)this, aFullScreen));

    if (aFullScreen) {
        if (mSizeMode != nsSizeMode_Fullscreen)
            mLastSizeMode = mSizeMode;

        mSizeMode = nsSizeMode_Fullscreen;
        gtk_window_fullscreen(GTK_WINDOW(mShell));
    }
    else {
        mSizeMode = mLastSizeMode;
        gtk_window_unfullscreen(GTK_WINDOW(mShell));
    }

    NS_ASSERTION(mLastSizeMode != nsSizeMode_Fullscreen,
                 "mLastSizeMode should never be fullscreen");
    return NS_OK;
}

NS_IMETHODIMP
nsWindow::HideWindowChrome(bool aShouldHide)
{
    if (!mShell) {
        // Pass the request to the toplevel window
        GtkWidget *topWidget = GetToplevelWidget();
        if (!topWidget)
            return NS_ERROR_FAILURE;

        nsWindow *topWindow = get_window_for_gtk_widget(topWidget);
        if (!topWindow)
            return NS_ERROR_FAILURE;

        return topWindow->HideWindowChrome(aShouldHide);
    }

    // Sawfish, metacity, and presumably other window managers get
    // confused if we change the window decorations while the window
    // is visible.
    bool wasVisible = false;
    GdkWindow *shellWindow = gtk_widget_get_window(mShell);
    if (gdk_window_is_visible(shellWindow)) {
        gdk_window_hide(shellWindow);
        wasVisible = true;
    }

    gint wmd;
    if (aShouldHide)
        wmd = 0;
    else
        wmd = ConvertBorderStyles(mBorderStyle);

    if (wmd != -1)
      gdk_window_set_decorations(shellWindow, (GdkWMDecoration) wmd);

    if (wasVisible)
        gdk_window_show(shellWindow);

    // For some window managers, adding or removing window decorations
    // requires unmapping and remapping our toplevel window.  Go ahead
    // and flush the queue here so that we don't end up with a BadWindow
    // error later when this happens (when the persistence timer fires
    // and GetWindowPos is called)
#ifdef MOZ_X11
    XSync(GDK_DISPLAY_XDISPLAY(gdk_display_get_default()) , False);
#else
    gdk_flush ();
#endif /* MOZ_X11 */

    return NS_OK;
}

bool
nsWindow::CheckForRollup(gdouble aMouseX, gdouble aMouseY,
                         bool aIsWheel, bool aAlwaysRollup)
{
    nsIRollupListener* rollupListener = GetActiveRollupListener();
    nsCOMPtr<nsIWidget> rollupWidget;
    if (rollupListener) {
        rollupWidget = rollupListener->GetRollupWidget();
    }
    if (!rollupWidget) {
        nsBaseWidget::gRollupListener = nullptr;
        return false;
    }

    bool retVal = false;
    GdkWindow *currentPopup =
        (GdkWindow *)rollupWidget->GetNativeData(NS_NATIVE_WINDOW);
    if (aAlwaysRollup || !is_mouse_in_window(currentPopup, aMouseX, aMouseY)) {
        bool rollup = true;
        if (aIsWheel) {
            rollup = rollupListener->ShouldRollupOnMouseWheelEvent();
            retVal = rollupListener->ShouldConsumeOnMouseWheelEvent();
        }
        // if we're dealing with menus, we probably have submenus and
        // we don't want to rollup if the click is in a parent menu of
        // the current submenu
        uint32_t popupsToRollup = UINT32_MAX;
        if (!aAlwaysRollup) {
            nsAutoTArray<nsIWidget*, 5> widgetChain;
            uint32_t sameTypeCount = rollupListener->GetSubmenuWidgetChain(&widgetChain);
            for (uint32_t i=0; i<widgetChain.Length(); ++i) {
                nsIWidget* widget = widgetChain[i];
                GdkWindow* currWindow =
                    (GdkWindow*) widget->GetNativeData(NS_NATIVE_WINDOW);
                if (is_mouse_in_window(currWindow, aMouseX, aMouseY)) {
                  // don't roll up if the mouse event occurred within a
                  // menu of the same type. If the mouse event occurred
                  // in a menu higher than that, roll up, but pass the
                  // number of popups to Rollup so that only those of the
                  // same type close up.
                  if (i < sameTypeCount) {
                    rollup = false;
                  }
                  else {
                    popupsToRollup = sameTypeCount;
                  }
                  break;
                }
            } // foreach parent menu widget
        } // if rollup listener knows about menus

        // if we've determined that we should still rollup, do it.
        bool usePoint = !aIsWheel && !aAlwaysRollup;
        nsIntPoint point(aMouseX, aMouseY);
        if (rollup && rollupListener->Rollup(popupsToRollup, usePoint ? &point : nullptr, nullptr)) {
            retVal = true;
        }
    }
    return retVal;
}

/* static */
bool
nsWindow::DragInProgress(void)
{
    nsCOMPtr<nsIDragService> dragService = do_GetService(kCDragServiceCID);

    if (!dragService)
        return false;

    nsCOMPtr<nsIDragSession> currentDragSession;
    dragService->GetCurrentSession(getter_AddRefs(currentDragSession));

    return currentDragSession != nullptr;
}

static bool
is_mouse_in_window (GdkWindow* aWindow, gdouble aMouseX, gdouble aMouseY)
{
    gint x = 0;
    gint y = 0;
    gint w, h;

    gint offsetX = 0;
    gint offsetY = 0;

    GdkWindow *window = aWindow;

    while (window) {
        gint tmpX = 0;
        gint tmpY = 0;

        gdk_window_get_position(window, &tmpX, &tmpY);
        GtkWidget *widget = get_gtk_widget_for_gdk_window(window);

        // if this is a window, compute x and y given its origin and our
        // offset
        if (GTK_IS_WINDOW(widget)) {
            x = tmpX + offsetX;
            y = tmpY + offsetY;
            break;
        }

        offsetX += tmpX;
        offsetY += tmpY;
        window = gdk_window_get_parent(window);
    }

#if (MOZ_WIDGET_GTK == 2)
    gdk_drawable_get_size(aWindow, &w, &h);
#else
    w = gdk_window_get_width(aWindow);
    h = gdk_window_get_height(aWindow);
#endif

    if (aMouseX > x && aMouseX < x + w &&
        aMouseY > y && aMouseY < y + h)
        return true;

    return false;
}

static nsWindow *
get_window_for_gtk_widget(GtkWidget *widget)
{
    gpointer user_data = g_object_get_data(G_OBJECT(widget), "nsWindow");

    return static_cast<nsWindow *>(user_data);
}

static nsWindow *
get_window_for_gdk_window(GdkWindow *window)
{
    gpointer user_data = g_object_get_data(G_OBJECT(window), "nsWindow");

    return static_cast<nsWindow *>(user_data);
}

static GtkWidget *
get_gtk_widget_for_gdk_window(GdkWindow *window)
{
    gpointer user_data = nullptr;
    gdk_window_get_user_data(window, &user_data);

    return GTK_WIDGET(user_data);
}

static GdkCursor *
get_gtk_cursor(nsCursor aCursor)
{
    GdkCursor *gdkcursor = nullptr;
    uint8_t newType = 0xff;

    if ((gdkcursor = gCursorCache[aCursor])) {
        return gdkcursor;
    }
    
    GdkDisplay *defaultDisplay = gdk_display_get_default();

    // The strategy here is to use standard GDK cursors, and, if not available,
    // load by standard name with gdk_cursor_new_from_name.
    // Spec is here: http://www.freedesktop.org/wiki/Specifications/cursor-spec/
    switch (aCursor) {
    case eCursor_standard:
        gdkcursor = gdk_cursor_new(GDK_LEFT_PTR);
        break;
    case eCursor_wait:
        gdkcursor = gdk_cursor_new(GDK_WATCH);
        break;
    case eCursor_select:
        gdkcursor = gdk_cursor_new(GDK_XTERM);
        break;
    case eCursor_hyperlink:
        gdkcursor = gdk_cursor_new(GDK_HAND2);
        break;
    case eCursor_n_resize:
        gdkcursor = gdk_cursor_new(GDK_TOP_SIDE);
        break;
    case eCursor_s_resize:
        gdkcursor = gdk_cursor_new(GDK_BOTTOM_SIDE);
        break;
    case eCursor_w_resize:
        gdkcursor = gdk_cursor_new(GDK_LEFT_SIDE);
        break;
    case eCursor_e_resize:
        gdkcursor = gdk_cursor_new(GDK_RIGHT_SIDE);
        break;
    case eCursor_nw_resize:
        gdkcursor = gdk_cursor_new(GDK_TOP_LEFT_CORNER);
        break;
    case eCursor_se_resize:
        gdkcursor = gdk_cursor_new(GDK_BOTTOM_RIGHT_CORNER);
        break;
    case eCursor_ne_resize:
        gdkcursor = gdk_cursor_new(GDK_TOP_RIGHT_CORNER);
        break;
    case eCursor_sw_resize:
        gdkcursor = gdk_cursor_new(GDK_BOTTOM_LEFT_CORNER);
        break;
    case eCursor_crosshair:
        gdkcursor = gdk_cursor_new(GDK_CROSSHAIR);
        break;
    case eCursor_move:
        gdkcursor = gdk_cursor_new(GDK_FLEUR);
        break;
    case eCursor_help:
        gdkcursor = gdk_cursor_new(GDK_QUESTION_ARROW);
        break;
    case eCursor_copy: // CSS3
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "copy");
        if (!gdkcursor)
            newType = MOZ_CURSOR_COPY;
        break;
    case eCursor_alias:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "alias");
        if (!gdkcursor)
            newType = MOZ_CURSOR_ALIAS;
        break;
    case eCursor_context_menu:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "context-menu");
        if (!gdkcursor)
            newType = MOZ_CURSOR_CONTEXT_MENU;
        break;
    case eCursor_cell:
        gdkcursor = gdk_cursor_new(GDK_PLUS);
        break;
    // Those two aren’t standardized. Trying both KDE’s and GNOME’s names
    case eCursor_grab:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "openhand");
        if (!gdkcursor)
            newType = MOZ_CURSOR_HAND_GRAB;
        break;
    case eCursor_grabbing:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "closedhand");
        if (!gdkcursor)
            gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "grabbing");
        if (!gdkcursor)
            newType = MOZ_CURSOR_HAND_GRABBING;
        break;
    case eCursor_spinning:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "progress");
        if (!gdkcursor)
            newType = MOZ_CURSOR_SPINNING;
        break;
    case eCursor_zoom_in:
        newType = MOZ_CURSOR_ZOOM_IN;
        break;
    case eCursor_zoom_out:
        newType = MOZ_CURSOR_ZOOM_OUT;
        break;
    case eCursor_not_allowed:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "not-allowed");
        if (!gdkcursor) // nonstandard, yet common
            gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "crossed_circle");
        if (!gdkcursor)
            newType = MOZ_CURSOR_NOT_ALLOWED;
        break;
    case eCursor_no_drop:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "no-drop");
        if (!gdkcursor) // this nonstandard sequence makes it work on KDE and GNOME
            gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "forbidden");
        if (!gdkcursor)
            gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "circle");
        if (!gdkcursor)
            newType = MOZ_CURSOR_NOT_ALLOWED;
        break;
    case eCursor_vertical_text:
        newType = MOZ_CURSOR_VERTICAL_TEXT;
        break;
    case eCursor_all_scroll:
        gdkcursor = gdk_cursor_new(GDK_FLEUR);
        break;
    case eCursor_nesw_resize:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "size_bdiag");
        if (!gdkcursor)
            newType = MOZ_CURSOR_NESW_RESIZE;
        break;
    case eCursor_nwse_resize:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "size_fdiag");
        if (!gdkcursor)
            newType = MOZ_CURSOR_NWSE_RESIZE;
        break;
    case eCursor_ns_resize:
        gdkcursor = gdk_cursor_new(GDK_SB_V_DOUBLE_ARROW);
        break;
    case eCursor_ew_resize:
        gdkcursor = gdk_cursor_new(GDK_SB_H_DOUBLE_ARROW);
        break;
    // Here, two better fitting cursors exist in some cursor themes. Try those first
    case eCursor_row_resize:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "split_v");
        if (!gdkcursor)
            gdkcursor = gdk_cursor_new(GDK_SB_V_DOUBLE_ARROW);
        break;
    case eCursor_col_resize:
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, "split_h");
        if (!gdkcursor)
            gdkcursor = gdk_cursor_new(GDK_SB_H_DOUBLE_ARROW);
        break;
    case eCursor_none:
        newType = MOZ_CURSOR_NONE;
        break;
    default:
        NS_ASSERTION(aCursor, "Invalid cursor type");
        gdkcursor = gdk_cursor_new(GDK_LEFT_PTR);
        break;
    }

    // If by now we don't have a xcursor, this means we have to make a custom
    // one. First, we try creating a named cursor based on the hash of our
    // custom bitmap, as libXcursor has some magic to convert bitmapped cursors
    // to themed cursors
    if (newType != 0xFF && GtkCursors[newType].hash) {
        gdkcursor = gdk_cursor_new_from_name(defaultDisplay, GtkCursors[newType].hash);
    }

    // If we still don't have a xcursor, we now really create a bitmap cursor
    if (newType != 0xff && !gdkcursor) {
        GdkPixbuf * cursor_pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, 32, 32);
        if (!cursor_pixbuf)
            return nullptr;
      
        guchar *data = gdk_pixbuf_get_pixels(cursor_pixbuf);
        
        // Read data from GtkCursors and compose RGBA surface from 1bit bitmap and mask
        // GtkCursors bits and mask are 32x32 monochrome bitmaps (1 bit for each pixel)
        // so it's 128 byte array (4 bytes for are one bitmap row and there are 32 rows here).
        const unsigned char *bits = GtkCursors[newType].bits;
        const unsigned char *mask_bits = GtkCursors[newType].mask_bits;
        
        for (int i = 0; i < 128; i++) {
            char bit = *bits++;
            char mask = *mask_bits++;
            for (int j = 0; j < 8; j++) {
                unsigned char pix = ~(((bit >> j) & 0x01) * 0xff);
                *data++ = pix;
                *data++ = pix;
                *data++ = pix;
                *data++ = (((mask >> j) & 0x01) * 0xff);
            }
        }
      
        gdkcursor = gdk_cursor_new_from_pixbuf(gdk_display_get_default(), cursor_pixbuf,
                                               GtkCursors[newType].hot_x,
                                               GtkCursors[newType].hot_y);
        
        g_object_unref(cursor_pixbuf);
    }

    gCursorCache[aCursor] = gdkcursor;

    return gdkcursor;
}

// gtk callbacks

#if (MOZ_WIDGET_GTK == 2)
static gboolean
expose_event_cb(GtkWidget *widget, GdkEventExpose *event)
{
    nsRefPtr<nsWindow> window = get_window_for_gdk_window(event->window);
    if (!window)
        return FALSE;

    window->OnExposeEvent(event);
    return FALSE;
}
#else
void
draw_window_of_widget(GtkWidget *widget, GdkWindow *aWindow, cairo_t *cr)
{
    if (gtk_cairo_should_draw_window(cr, aWindow)) {
        nsRefPtr<nsWindow> window = get_window_for_gdk_window(aWindow);
        if (!window) {
            NS_WARNING("Cannot get nsWindow from GtkWidget");
        }
        else {      
            cairo_save(cr);      
            gtk_cairo_transform_to_window(cr, widget, aWindow);  
            // TODO - window->OnExposeEvent() can destroy this or other windows,
            // do we need to handle it somehow?
            window->OnExposeEvent(cr);
            cairo_restore(cr);
        }
    }
    
    GList *children = gdk_window_get_children(aWindow);
    GList *child = children;
    while (child) {
        GdkWindow *window = GDK_WINDOW(child->data);
        gpointer windowWidget;
        gdk_window_get_user_data(window, &windowWidget);
        if (windowWidget == widget) {
            draw_window_of_widget(widget, window, cr);
        }
        child = g_list_next(child);
    }  
    g_list_free(children);
}

/* static */
gboolean
expose_event_cb(GtkWidget *widget, cairo_t *cr)
{
    draw_window_of_widget(widget, gtk_widget_get_window(widget), cr);
    return FALSE;
}
#endif //MOZ_WIDGET_GTK2

static gboolean
configure_event_cb(GtkWidget *widget,
                   GdkEventConfigure *event)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(widget);
    if (!window)
        return FALSE;

    return window->OnConfigureEvent(widget, event);
}

static void
container_unrealize_cb (GtkWidget *widget)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(widget);
    if (!window)
        return;

    window->OnContainerUnrealize();
}

static void
size_allocate_cb (GtkWidget *widget, GtkAllocation *allocation)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(widget);
    if (!window)
        return;

    window->OnSizeAllocate(allocation);
}

static gboolean
delete_event_cb(GtkWidget *widget, GdkEventAny *event)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(widget);
    if (!window)
        return FALSE;

    window->OnDeleteEvent();

    return TRUE;
}

static gboolean
enter_notify_event_cb(GtkWidget *widget,
                      GdkEventCrossing *event)
{
    nsRefPtr<nsWindow> window = get_window_for_gdk_window(event->window);
    if (!window)
        return TRUE;

    window->OnEnterNotifyEvent(event);

    return TRUE;
}

static gboolean
leave_notify_event_cb(GtkWidget *widget,
                      GdkEventCrossing *event)
{
    if (is_parent_grab_leave(event)) {
        return TRUE;
    }

    // bug 369599: Suppress LeaveNotify events caused by pointer grabs to
    // avoid generating spurious mouse exit events.
    gint x = gint(event->x_root);
    gint y = gint(event->y_root);
    GdkDisplay* display = gtk_widget_get_display(widget);
    GdkWindow* winAtPt = gdk_display_get_window_at_pointer(display, &x, &y);
    if (winAtPt == event->window) {
        return TRUE;
    }

    nsRefPtr<nsWindow> window = get_window_for_gdk_window(event->window);
    if (!window)
        return TRUE;

    window->OnLeaveNotifyEvent(event);

    return TRUE;
}

static nsWindow*
GetFirstNSWindowForGDKWindow(GdkWindow *aGdkWindow)
{
    nsWindow* window;
    while (!(window = get_window_for_gdk_window(aGdkWindow))) {
        // The event has bubbled to the moz_container widget as passed into each caller's *widget parameter,
        // but its corresponding nsWindow is an ancestor of the window that we need.  Instead, look at
        // event->window and find the first ancestor nsWindow of it because event->window may be in a plugin.
        aGdkWindow = gdk_window_get_parent(aGdkWindow);
        if (!aGdkWindow) {
            window = nullptr;
            break;
        }
    }
    return window;
}

static gboolean
motion_notify_event_cb(GtkWidget *widget, GdkEventMotion *event)
{
    UpdateLastInputEventTime(event);

    nsWindow *window = GetFirstNSWindowForGDKWindow(event->window);
    if (!window)
        return FALSE;

    window->OnMotionNotifyEvent(event);

    return TRUE;
}

static gboolean
button_press_event_cb(GtkWidget *widget, GdkEventButton *event)
{
    UpdateLastInputEventTime(event);

    nsWindow *window = GetFirstNSWindowForGDKWindow(event->window);
    if (!window)
        return FALSE;

    window->OnButtonPressEvent(event);

    return TRUE;
}

static gboolean
button_release_event_cb(GtkWidget *widget, GdkEventButton *event)
{
    UpdateLastInputEventTime(event);

    nsWindow *window = GetFirstNSWindowForGDKWindow(event->window);
    if (!window)
        return FALSE;

    window->OnButtonReleaseEvent(event);

    return TRUE;
}

static gboolean
focus_in_event_cb(GtkWidget *widget, GdkEventFocus *event)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(widget);
    if (!window)
        return FALSE;

    window->OnContainerFocusInEvent(event);

    return FALSE;
}

static gboolean
focus_out_event_cb(GtkWidget *widget, GdkEventFocus *event)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(widget);
    if (!window)
        return FALSE;

    window->OnContainerFocusOutEvent(event);

    return FALSE;
}

#ifdef MOZ_X11
// For long-lived popup windows that don't really take focus themselves but
// may have elements that accept keyboard input when the parent window is
// active, focus is handled specially.  These windows include noautohide
// panels.  (This special handling is not necessary for temporary popups where
// the keyboard is grabbed.)
//
// Mousing over or clicking on these windows should not cause them to steal
// focus from their parent windows, so, the input field of WM_HINTS is set to
// False to request that the window manager not set the input focus to this
// window.  http://tronche.com/gui/x/icccm/sec-4.html#s-4.1.7
//
// However, these windows can still receive WM_TAKE_FOCUS messages from the
// window manager, so they can still detect when the user has indicated that
// they wish to direct keyboard input at these windows.  When the window
// manager offers focus to these windows (after a mouse over or click, for
// example), a request to make the parent window active is issued.  When the
// parent window becomes active, keyboard events will be received.

static GdkFilterReturn
popup_take_focus_filter(GdkXEvent *gdk_xevent,
                        GdkEvent *event,
                        gpointer data)
{
    XEvent* xevent = static_cast<XEvent*>(gdk_xevent);
    if (xevent->type != ClientMessage)
        return GDK_FILTER_CONTINUE;

    XClientMessageEvent& xclient = xevent->xclient;
    if (xclient.message_type != gdk_x11_get_xatom_by_name("WM_PROTOCOLS"))
        return GDK_FILTER_CONTINUE;

    Atom atom = xclient.data.l[0];
    if (atom != gdk_x11_get_xatom_by_name("WM_TAKE_FOCUS"))
        return GDK_FILTER_CONTINUE;

    guint32 timestamp = xclient.data.l[1];

    GtkWidget* widget = get_gtk_widget_for_gdk_window(event->any.window);
    if (!widget)
        return GDK_FILTER_CONTINUE;

    GtkWindow* parent = gtk_window_get_transient_for(GTK_WINDOW(widget));
    if (!parent)
        return GDK_FILTER_CONTINUE;

    if (gtk_window_is_active(parent))
        return GDK_FILTER_REMOVE; // leave input focus on the parent

    GdkWindow* parent_window = gtk_widget_get_window(GTK_WIDGET(parent));
    if (!parent_window)
        return GDK_FILTER_CONTINUE;

    // In case the parent has not been deconified.
    gdk_window_show_unraised(parent_window);

    // Request focus on the parent window.
    // Use gdk_window_focus rather than gtk_window_present to avoid
    // raising the parent window.
    gdk_window_focus(parent_window, timestamp);
    return GDK_FILTER_REMOVE;
}

static GdkFilterReturn
plugin_window_filter_func(GdkXEvent *gdk_xevent, GdkEvent *event, gpointer data)
{
    GdkWindow  *plugin_window;
    XEvent     *xevent;
    Window      xeventWindow;

    nsRefPtr<nsWindow> nswindow = (nsWindow*)data;
    GdkFilterReturn return_val;

    xevent = (XEvent *)gdk_xevent;
    return_val = GDK_FILTER_CONTINUE;

    switch (xevent->type)
    {
        case CreateNotify:
        case ReparentNotify:
            if (xevent->type==CreateNotify) {
                xeventWindow = xevent->xcreatewindow.window;
            }
            else {
                if (xevent->xreparent.event != xevent->xreparent.parent)
                    break;
                xeventWindow = xevent->xreparent.window;
            }
#if (MOZ_WIDGET_GTK == 2)
            plugin_window = gdk_window_lookup(xeventWindow);
#else
            plugin_window = gdk_x11_window_lookup_for_display(
                                  gdk_x11_lookup_xdisplay(xevent->xcreatewindow.display), xeventWindow);
#endif        
            if (plugin_window) {
                GtkWidget *widget =
                    get_gtk_widget_for_gdk_window(plugin_window);

// TODO GTK3
#if (MOZ_WIDGET_GTK == 2)
                if (GTK_IS_XTBIN(widget)) {
                    nswindow->SetPluginType(nsWindow::PluginType_NONXEMBED);
                    break;
                }
                else 
#endif
                if(GTK_IS_SOCKET(widget)) {
                    if (!g_object_get_data(G_OBJECT(widget), "enable-xt-focus")) {
                        nswindow->SetPluginType(nsWindow::PluginType_XEMBED);
                        break;
                    }
                }
            }
            nswindow->SetPluginType(nsWindow::PluginType_NONXEMBED);
            return_val = GDK_FILTER_REMOVE;
            break;
        case EnterNotify:
            nswindow->SetNonXEmbedPluginFocus();
            break;
        case DestroyNotify:
            gdk_window_remove_filter
                ((GdkWindow*)(nswindow->GetNativeData(NS_NATIVE_WINDOW)),
                 plugin_window_filter_func,
                 nswindow);
            // Currently we consider all plugins are non-xembed and calls
            // LoseNonXEmbedPluginFocus without any checking.
            nswindow->LoseNonXEmbedPluginFocus();
            break;
        default:
            break;
    }
    return return_val;
}

static GdkFilterReturn
plugin_client_message_filter(GdkXEvent *gdk_xevent,
                             GdkEvent *event,
                             gpointer data)
{
    XEvent    *xevent;
    xevent = (XEvent *)gdk_xevent;

    GdkFilterReturn return_val;
    return_val = GDK_FILTER_CONTINUE;

    if (!gPluginFocusWindow || xevent->type!=ClientMessage) {
        return return_val;
    }

    // When WM sends out WM_TAKE_FOCUS, gtk2 will use XSetInputFocus
    // to set the focus to the focus proxy. To prevent this happen
    // while the focus is on the plugin, we filter the WM_TAKE_FOCUS
    // out.
    if (gdk_x11_get_xatom_by_name("WM_PROTOCOLS")
            != xevent->xclient.message_type) {
        return return_val;
    }

    if ((Atom) xevent->xclient.data.l[0] ==
            gdk_x11_get_xatom_by_name("WM_TAKE_FOCUS")) {
        // block it from gtk2.0 focus proxy
        return_val = GDK_FILTER_REMOVE;
    }

    return return_val;
}
#endif /* MOZ_X11 */

static gboolean
key_press_event_cb(GtkWidget *widget, GdkEventKey *event)
{
    LOG(("key_press_event_cb\n"));

    UpdateLastInputEventTime(event);

    // find the window with focus and dispatch this event to that widget
    nsWindow *window = get_window_for_gtk_widget(widget);
    if (!window)
        return FALSE;

    nsRefPtr<nsWindow> focusWindow = gFocusWindow ? gFocusWindow : window;

#ifdef MOZ_X11
    // Keyboard repeat can cause key press events to queue up when there are
    // slow event handlers (bug 301029).  Throttle these events by removing
    // consecutive pending duplicate KeyPress events to the same window.
    // We use the event time of the last one.
    // Note: GDK calls XkbSetDetectableAutorepeat so that KeyRelease events
    // are generated only when the key is physically released.
#define NS_GDKEVENT_MATCH_MASK 0x1FFF /* GDK_SHIFT_MASK .. GDK_BUTTON5_MASK */
    GdkDisplay* gdkDisplay = gtk_widget_get_display(widget);
    Display* dpy = GDK_DISPLAY_XDISPLAY(gdkDisplay);
    while (XPending(dpy)) {
        XEvent next_event;
        XPeekEvent(dpy, &next_event);
        GdkWindow* nextGdkWindow =
            gdk_x11_window_lookup_for_display(gdkDisplay, next_event.xany.window);
        if (nextGdkWindow != event->window ||
            next_event.type != KeyPress ||
            next_event.xkey.keycode != event->hardware_keycode ||
            next_event.xkey.state != (event->state & NS_GDKEVENT_MATCH_MASK)) {
            break;
        }
        XNextEvent(dpy, &next_event);
        event->time = next_event.xkey.time;
    }
#endif

    return focusWindow->OnKeyPressEvent(event);
}

static gboolean
key_release_event_cb(GtkWidget *widget, GdkEventKey *event)
{
    LOG(("key_release_event_cb\n"));

    UpdateLastInputEventTime(event);

    // find the window with focus and dispatch this event to that widget
    nsWindow *window = get_window_for_gtk_widget(widget);
    if (!window)
        return FALSE;

    nsRefPtr<nsWindow> focusWindow = gFocusWindow ? gFocusWindow : window;

    return focusWindow->OnKeyReleaseEvent(event);
}

static gboolean
scroll_event_cb(GtkWidget *widget, GdkEventScroll *event)
{
    nsWindow *window = GetFirstNSWindowForGDKWindow(event->window);
    if (!window)
        return FALSE;

    window->OnScrollEvent(event);

    return TRUE;
}

static gboolean
visibility_notify_event_cb (GtkWidget *widget, GdkEventVisibility *event)
{
    nsRefPtr<nsWindow> window = get_window_for_gdk_window(event->window);
    if (!window)
        return FALSE;

    window->OnVisibilityNotifyEvent(event);

    return TRUE;
}

static void
hierarchy_changed_cb (GtkWidget *widget,
                      GtkWidget *previous_toplevel)
{
    GtkWidget *toplevel = gtk_widget_get_toplevel(widget);
    GdkWindowState old_window_state = GDK_WINDOW_STATE_WITHDRAWN;
    GdkEventWindowState event;

    event.new_window_state = GDK_WINDOW_STATE_WITHDRAWN;

    if (GTK_IS_WINDOW(previous_toplevel)) {
        g_signal_handlers_disconnect_by_func(previous_toplevel,
                                             FuncToGpointer(window_state_event_cb),
                                             widget);
        GdkWindow *win = gtk_widget_get_window(previous_toplevel);
        if (win) {
            old_window_state = gdk_window_get_state(win);
        }
    }

    if (GTK_IS_WINDOW(toplevel)) {
        g_signal_connect_swapped(toplevel, "window-state-event",
                                 G_CALLBACK(window_state_event_cb), widget);
        GdkWindow *win = gtk_widget_get_window(toplevel);
        if (win) {
            event.new_window_state = gdk_window_get_state(win);
        }
    }

    event.changed_mask = static_cast<GdkWindowState>
        (old_window_state ^ event.new_window_state);

    if (event.changed_mask) {
        event.type = GDK_WINDOW_STATE;
        event.window = nullptr;
        event.send_event = TRUE;
        window_state_event_cb(widget, &event);
    }
}

static gboolean
window_state_event_cb (GtkWidget *widget, GdkEventWindowState *event)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(widget);
    if (!window)
        return FALSE;

    window->OnWindowStateEvent(widget, event);

    return FALSE;
}

static void
theme_changed_cb (GtkSettings *settings, GParamSpec *pspec, nsWindow *data)
{
    nsRefPtr<nsWindow> window = data;
    window->ThemeChanged();
}

//////////////////////////////////////////////////////////////////////
// These are all of our drag and drop operations

void
nsWindow::InitDragEvent(WidgetDragEvent &aEvent)
{
    // set the keyboard modifiers
    guint modifierState = KeymapWrapper::GetCurrentModifierState();
    KeymapWrapper::InitInputEvent(aEvent, modifierState);
}

static gboolean
drag_motion_event_cb(GtkWidget *aWidget,
                     GdkDragContext *aDragContext,
                     gint aX,
                     gint aY,
                     guint aTime,
                     gpointer aData)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(aWidget);
    if (!window)
        return FALSE;

    // figure out which internal widget this drag motion actually happened on
    nscoord retx = 0;
    nscoord rety = 0;

    GdkWindow *innerWindow =
        get_inner_gdk_window(gtk_widget_get_window(aWidget), aX, aY,
                             &retx, &rety);
    nsRefPtr<nsWindow> innerMostWindow = get_window_for_gdk_window(innerWindow);

    if (!innerMostWindow) {
        innerMostWindow = window;
    }

    LOGDRAG(("nsWindow drag-motion signal for %p\n", (void*)innerMostWindow));

    return nsDragService::GetInstance()->
        ScheduleMotionEvent(innerMostWindow, aDragContext,
                            nsIntPoint(retx, rety), aTime);
}

static void
drag_leave_event_cb(GtkWidget *aWidget,
                    GdkDragContext *aDragContext,
                    guint aTime,
                    gpointer aData)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(aWidget);
    if (!window)
        return;

    nsDragService *dragService = nsDragService::GetInstance();

    nsWindow *mostRecentDragWindow = dragService->GetMostRecentDestWindow();
    if (!mostRecentDragWindow) {
        // This can happen when the target will not accept a drop.  A GTK drag
        // source sends the leave message to the destination before the
        // drag-failed signal on the source widget, but the leave message goes
        // via the X server, and so doesn't get processed at least until the
        // event loop runs again.
        return;
    }

    GtkWidget *mozContainer = mostRecentDragWindow->GetMozContainerWidget();
    if (aWidget != mozContainer)
    {
        // When the drag moves between widgets, GTK can send leave signal for
        // the old widget after the motion or drop signal for the new widget.
        // We'll send the leave event when the motion or drop event is run.
        return;
    }

    LOGDRAG(("nsWindow drag-leave signal for %p\n",
             (void*)mostRecentDragWindow));

    dragService->ScheduleLeaveEvent();
}


static gboolean
drag_drop_event_cb(GtkWidget *aWidget,
                   GdkDragContext *aDragContext,
                   gint aX,
                   gint aY,
                   guint aTime,
                   gpointer aData)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(aWidget);
    if (!window)
        return FALSE;

    // figure out which internal widget this drag motion actually happened on
    nscoord retx = 0;
    nscoord rety = 0;

    GdkWindow *innerWindow =
        get_inner_gdk_window(gtk_widget_get_window(aWidget), aX, aY,
                             &retx, &rety);
    nsRefPtr<nsWindow> innerMostWindow = get_window_for_gdk_window(innerWindow);

    if (!innerMostWindow) {
        innerMostWindow = window;
    }

    LOGDRAG(("nsWindow drag-drop signal for %p\n", (void*)innerMostWindow));

    return nsDragService::GetInstance()->
        ScheduleDropEvent(innerMostWindow, aDragContext,
                          nsIntPoint(retx, rety), aTime);
}

static void
drag_data_received_event_cb(GtkWidget *aWidget,
                            GdkDragContext *aDragContext,
                            gint aX,
                            gint aY,
                            GtkSelectionData  *aSelectionData,
                            guint aInfo,
                            guint aTime,
                            gpointer aData)
{
    nsRefPtr<nsWindow> window = get_window_for_gtk_widget(aWidget);
    if (!window)
        return;

    window->OnDragDataReceivedEvent(aWidget,
                                    aDragContext,
                                    aX, aY,
                                    aSelectionData,
                                    aInfo, aTime, aData);
}

static nsresult
initialize_prefs(void)
{
    gRaiseWindows =
        Preferences::GetBool("mozilla.widget.raise-on-setfocus", true);

    return NS_OK;
}

static GdkWindow *
get_inner_gdk_window (GdkWindow *aWindow,
                      gint x, gint y,
                      gint *retx, gint *rety)
{
    gint cx, cy, cw, ch;
    GList *children = gdk_window_peek_children(aWindow);
    for (GList *child = g_list_last(children);
         child;
         child = g_list_previous(child)) {
        GdkWindow *childWindow = (GdkWindow *) child->data;
        if (get_window_for_gdk_window(childWindow)) {
#if (MOZ_WIDGET_GTK == 2)
            gdk_window_get_geometry(childWindow, &cx, &cy, &cw, &ch, nullptr);
#else
            gdk_window_get_geometry(childWindow, &cx, &cy, &cw, &ch);
#endif
            if ((cx < x) && (x < (cx + cw)) &&
                (cy < y) && (y < (cy + ch)) &&
                gdk_window_is_visible(childWindow)) {
                return get_inner_gdk_window(childWindow,
                                            x - cx, y - cy,
                                            retx, rety);
            }
        }
    }
    *retx = x;
    *rety = y;
    return aWindow;
}

static inline bool
is_context_menu_key(const WidgetKeyboardEvent& aKeyEvent)
{
    return ((aKeyEvent.keyCode == NS_VK_F10 && aKeyEvent.IsShift() &&
             !aKeyEvent.IsControl() && !aKeyEvent.IsMeta() &&
             !aKeyEvent.IsAlt()) ||
            (aKeyEvent.keyCode == NS_VK_CONTEXT_MENU && !aKeyEvent.IsShift() &&
             !aKeyEvent.IsControl() && !aKeyEvent.IsMeta() &&
             !aKeyEvent.IsAlt()));
}

static int
is_parent_ungrab_enter(GdkEventCrossing *aEvent)
{
    return (GDK_CROSSING_UNGRAB == aEvent->mode) &&
        ((GDK_NOTIFY_ANCESTOR == aEvent->detail) ||
         (GDK_NOTIFY_VIRTUAL == aEvent->detail));

}

static int
is_parent_grab_leave(GdkEventCrossing *aEvent)
{
    return (GDK_CROSSING_GRAB == aEvent->mode) &&
        ((GDK_NOTIFY_ANCESTOR == aEvent->detail) ||
            (GDK_NOTIFY_VIRTUAL == aEvent->detail));
}

#ifdef ACCESSIBILITY
void
nsWindow::CreateRootAccessible()
{
    if (mIsTopLevel && !mRootAccessible) {
        LOG(("nsWindow:: Create Toplevel Accessibility\n"));
        mRootAccessible = GetRootAccessible();
    }
}

void
nsWindow::DispatchEventToRootAccessible(uint32_t aEventType)
{
    if (!a11y::ShouldA11yBeEnabled()) {
        return;
    }

    nsCOMPtr<nsIAccessibilityService> accService =
        services::GetAccessibilityService();
    if (!accService) {
        return;
    }

    // Get the root document accessible and fire event to it.
    a11y::Accessible* acc = GetRootAccessible();
    if (acc) {
        accService->FireAccessibleEvent(aEventType, acc);
    }
}

void
nsWindow::DispatchActivateEventAccessible(void)
{
    DispatchEventToRootAccessible(nsIAccessibleEvent::EVENT_WINDOW_ACTIVATE);
}

void
nsWindow::DispatchDeactivateEventAccessible(void)
{
    DispatchEventToRootAccessible(nsIAccessibleEvent::EVENT_WINDOW_DEACTIVATE);
}

void
nsWindow::DispatchMaximizeEventAccessible(void)
{
    DispatchEventToRootAccessible(nsIAccessibleEvent::EVENT_WINDOW_MAXIMIZE);
}

void
nsWindow::DispatchMinimizeEventAccessible(void)
{
    DispatchEventToRootAccessible(nsIAccessibleEvent::EVENT_WINDOW_MINIMIZE);
}

void
nsWindow::DispatchRestoreEventAccessible(void)
{
    DispatchEventToRootAccessible(nsIAccessibleEvent::EVENT_WINDOW_RESTORE);
}

#endif /* #ifdef ACCESSIBILITY */

// nsChildWindow class

nsChildWindow::nsChildWindow()
{
}

nsChildWindow::~nsChildWindow()
{
}

NS_IMETHODIMP
nsWindow::NotifyIME(const IMENotification& aIMENotification)
{
    if (MOZ_UNLIKELY(!mIMModule)) {
        return NS_ERROR_NOT_AVAILABLE;
    }
    switch (aIMENotification.mMessage) {
        case REQUEST_TO_COMMIT_COMPOSITION:
        case REQUEST_TO_CANCEL_COMPOSITION:
            return mIMModule->EndIMEComposition(this);
        case NOTIFY_IME_OF_FOCUS:
            mIMModule->OnFocusChangeInGecko(true);
            return NS_OK;
        case NOTIFY_IME_OF_BLUR:
            mIMModule->OnFocusChangeInGecko(false);
            return NS_OK;
        case NOTIFY_IME_OF_COMPOSITION_UPDATE:
            mIMModule->OnUpdateComposition();
            return NS_OK;
        case NOTIFY_IME_OF_SELECTION_CHANGE:
            mIMModule->OnSelectionChange(this);
            return NS_OK;
        default:
            return NS_ERROR_NOT_IMPLEMENTED;
    }
}

NS_IMETHODIMP_(void)
nsWindow::SetInputContext(const InputContext& aContext,
                          const InputContextAction& aAction)
{
    if (!mIMModule) {
        return;
    }
    mIMModule->SetInputContext(this, &aContext, &aAction);
}

NS_IMETHODIMP_(InputContext)
nsWindow::GetInputContext()
{
  InputContext context;
  if (!mIMModule) {
      context.mIMEState.mEnabled = IMEState::DISABLED;
      context.mIMEState.mOpen = IMEState::OPEN_STATE_NOT_SUPPORTED;
      // If IME context isn't available on this widget, we should set |this|
      // instead of nullptr since nullptr means that the platform has only one
      // context per process.
      context.mNativeIMEContext = this;
  } else {
      context = mIMModule->GetInputContext();
      context.mNativeIMEContext = mIMModule;
  }
  return context;
}

nsIMEUpdatePreference
nsWindow::GetIMEUpdatePreference()
{
    nsIMEUpdatePreference updatePreference(
        nsIMEUpdatePreference::NOTIFY_SELECTION_CHANGE);
    // We shouldn't notify IME of selection change caused by changes of
    // composition string.  Therefore, we don't need to be notified selection
    // changes which are caused by compositionchange events handled.
    updatePreference.DontNotifyChangesCausedByComposition();
    return updatePreference;
}

bool
nsWindow::ExecuteNativeKeyBindingRemapped(NativeKeyBindingsType aType,
                                          const WidgetKeyboardEvent& aEvent,
                                          DoCommandCallback aCallback,
                                          void* aCallbackData,
                                          uint32_t aGeckoKeyCode,
                                          uint32_t aNativeKeyCode)
{
    WidgetKeyboardEvent modifiedEvent(aEvent);
    modifiedEvent.keyCode = aGeckoKeyCode;
    static_cast<GdkEventKey*>(modifiedEvent.mNativeKeyEvent)->keyval =
        aNativeKeyCode;

    NativeKeyBindings* keyBindings = NativeKeyBindings::GetInstance(aType);
    return keyBindings->Execute(modifiedEvent, aCallback, aCallbackData);
}

NS_IMETHODIMP_(bool)
nsWindow::ExecuteNativeKeyBinding(NativeKeyBindingsType aType,
                                  const WidgetKeyboardEvent& aEvent,
                                  DoCommandCallback aCallback,
                                  void* aCallbackData)
{
    if (aEvent.keyCode >= nsIDOMKeyEvent::DOM_VK_LEFT &&
        aEvent.keyCode <= nsIDOMKeyEvent::DOM_VK_DOWN) {

        // Check if we're targeting content with vertical writing mode,
        // and if so remap the arrow keys.
        WidgetQueryContentEvent query(true, NS_QUERY_SELECTED_TEXT, this);
        nsEventStatus status;
        DispatchEvent(&query, status);

        if (query.mSucceeded && query.mReply.mWritingMode.IsVertical()) {
            uint32_t geckoCode = 0;
            uint32_t gdkCode = 0;
            switch (aEvent.keyCode) {
            case nsIDOMKeyEvent::DOM_VK_LEFT:
                if (query.mReply.mWritingMode.IsVerticalLR()) {
                    geckoCode = nsIDOMKeyEvent::DOM_VK_UP;
                    gdkCode = GDK_Up;
                } else {
                    geckoCode = nsIDOMKeyEvent::DOM_VK_DOWN;
                    gdkCode = GDK_Down;
                }
                break;

            case nsIDOMKeyEvent::DOM_VK_RIGHT:
                if (query.mReply.mWritingMode.IsVerticalLR()) {
                    geckoCode = nsIDOMKeyEvent::DOM_VK_DOWN;
                    gdkCode = GDK_Down;
                } else {
                    geckoCode = nsIDOMKeyEvent::DOM_VK_UP;
                    gdkCode = GDK_Up;
                }
                break;

            case nsIDOMKeyEvent::DOM_VK_UP:
                geckoCode = nsIDOMKeyEvent::DOM_VK_LEFT;
                gdkCode = GDK_Left;
                break;

            case nsIDOMKeyEvent::DOM_VK_DOWN:
                geckoCode = nsIDOMKeyEvent::DOM_VK_RIGHT;
                gdkCode = GDK_Right;
                break;
            }

            return ExecuteNativeKeyBindingRemapped(aType, aEvent, aCallback,
                                                   aCallbackData,
                                                   geckoCode, gdkCode);
        }
    }

    NativeKeyBindings* keyBindings = NativeKeyBindings::GetInstance(aType);
    return keyBindings->Execute(aEvent, aCallback, aCallbackData);
}

NS_IMETHODIMP
nsWindow::GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState)
{
    NS_ENSURE_ARG_POINTER(aLEDState);

    KeymapWrapper::Modifiers modifier;
    switch (aKeyCode) {
        case NS_VK_CAPS_LOCK:   modifier = KeymapWrapper::CAPS_LOCK;   break;
        case NS_VK_NUM_LOCK:    modifier = KeymapWrapper::NUM_LOCK;    break;
        case NS_VK_SCROLL_LOCK: modifier = KeymapWrapper::SCROLL_LOCK; break;
        default: return NS_ERROR_INVALID_ARG;
    }

    *aLEDState =
        KeymapWrapper::AreModifiersCurrentlyActive(modifier);
    return NS_OK;
}

#if defined(MOZ_X11) && (MOZ_WIDGET_GTK == 2)
/* static */ already_AddRefed<gfxASurface>
nsWindow::GetSurfaceForGdkDrawable(GdkDrawable* aDrawable,
                                   const nsIntSize& aSize)
{
    GdkVisual* visual = gdk_drawable_get_visual(aDrawable);
    Screen* xScreen =
        gdk_x11_screen_get_xscreen(gdk_drawable_get_screen(aDrawable));
    Display* xDisplay = DisplayOfScreen(xScreen);
    Drawable xDrawable = gdk_x11_drawable_get_xid(aDrawable);

    nsRefPtr<gfxASurface> result;

    if (visual) {
        Visual* xVisual = gdk_x11_visual_get_xvisual(visual);

        result = new gfxXlibSurface(xDisplay, xDrawable, xVisual,
                                    gfxIntSize(aSize.width, aSize.height));
    } else {
        // no visual? we must be using an xrender format.  Find a format
        // for this depth.
        XRenderPictFormat *pf = nullptr;
        switch (gdk_drawable_get_depth(aDrawable)) {
            case 32:
                pf = XRenderFindStandardFormat(xDisplay, PictStandardARGB32);
                break;
            case 24:
                pf = XRenderFindStandardFormat(xDisplay, PictStandardRGB24);
                break;
            default:
                NS_ERROR("Don't know how to handle the given depth!");
                break;
        }

        result = new gfxXlibSurface(xScreen, xDrawable, pf,
                                    gfxIntSize(aSize.width, aSize.height));
    }

    return result.forget();
}
#endif

TemporaryRef<DrawTarget>
nsWindow::StartRemoteDrawing()
{
  gfxASurface *surf = GetThebesSurface();
  if (!surf) {
    return nullptr;
  }

  IntSize size(surf->GetSize().width, surf->GetSize().height);
  if (size.width <= 0 || size.height <= 0) {
    return nullptr;
  }

  return gfxPlatform::GetPlatform()->CreateDrawTargetForSurface(surf, size);
}

// return the gfxASurface for rendering to this widget
gfxASurface*
nsWindow::GetThebesSurface()
#if (MOZ_WIDGET_GTK == 3)
{
    return GetThebesSurface(nullptr);
}
gfxASurface*
nsWindow::GetThebesSurface(cairo_t *cr)
#endif
{
    if (!mGdkWindow)
        return nullptr;

#ifdef MOZ_X11
    gint width, height;

#if (MOZ_WIDGET_GTK == 2)
    gdk_drawable_get_size(GDK_DRAWABLE(mGdkWindow), &width, &height);
#else
    width = gdk_window_get_width(mGdkWindow);
    height = gdk_window_get_height(mGdkWindow);
#endif

    // Owen Taylor says this is the right thing to do!
    width = std::min(32767, width);
    height = std::min(32767, height);
    gfxIntSize size(width, height);

    GdkVisual *gdkVisual = gdk_window_get_visual(mGdkWindow);
    Visual* visual = gdk_x11_visual_get_xvisual(gdkVisual);

#  ifdef MOZ_HAVE_SHMIMAGE
    bool usingShm = false;
    if (nsShmImage::UseShm()) {
        // EnsureShmImage() is a dangerous interface, but we guarantee
        // that the thebes surface and the shmimage have the same
        // lifetime
        mThebesSurface =
            nsShmImage::EnsureShmImage(size,
                                       visual, gdk_visual_get_depth(gdkVisual),
                                       mShmImage);
        usingShm = mThebesSurface != nullptr;
    }
    if (!usingShm)
#  endif  // MOZ_HAVE_SHMIMAGE
    {
#if (MOZ_WIDGET_GTK == 3)
#if MOZ_TREE_CAIRO
#error "cairo-gtk3 target must be built with --enable-system-cairo"
#else    
        if (cr) {
            cairo_surface_t *surf = cairo_get_target(cr);
            if (cairo_surface_status(surf) != CAIRO_STATUS_SUCCESS) {
              NS_NOTREACHED("Missing cairo target?");
              return nullptr;
            }
            mThebesSurface = gfxASurface::Wrap(surf);
        } else
#endif
#endif // (MOZ_WIDGET_GTK == 3)
            mThebesSurface = new gfxXlibSurface
                (GDK_WINDOW_XDISPLAY(mGdkWindow),
                 gdk_x11_window_get_xid(mGdkWindow),
                 visual,
                 size);
    }
#endif // MOZ_X11

    // if the surface creation is reporting an error, then
    // we don't have a surface to give back
    if (mThebesSurface && mThebesSurface->CairoStatus() != 0) {
        mThebesSurface = nullptr;
    }

    return mThebesSurface;
}

// Code shared begin BeginMoveDrag and BeginResizeDrag
bool
nsWindow::GetDragInfo(WidgetMouseEvent* aMouseEvent,
                      GdkWindow** aWindow, gint* aButton,
                      gint* aRootX, gint* aRootY)
{
    if (aMouseEvent->button != WidgetMouseEvent::eLeftButton) {
        // we can only begin a move drag with the left mouse button
        return false;
    }
    *aButton = 1;

    // get the gdk window for this widget
    GdkWindow* gdk_window = mGdkWindow;
    if (!gdk_window) {
        return false;
    }
    NS_ABORT_IF_FALSE(GDK_IS_WINDOW(gdk_window), "must really be window");

    // find the top-level window
    gdk_window = gdk_window_get_toplevel(gdk_window);
    NS_ABORT_IF_FALSE(gdk_window,
                      "gdk_window_get_toplevel should not return null");
    *aWindow = gdk_window;

    if (!aMouseEvent->widget) {
        return false;
    }

    // FIXME: It would be nice to have the widget position at the time
    // of the event, but it's relatively unlikely that the widget has
    // moved since the mousedown.  (On the other hand, it's quite likely
    // that the mouse has moved, which is why we use the mouse position
    // from the event.)
    nsIntPoint offset = aMouseEvent->widget->WidgetToScreenOffset();
    *aRootX = aMouseEvent->refPoint.x + offset.x;
    *aRootY = aMouseEvent->refPoint.y + offset.y;

    return true;
}

NS_IMETHODIMP
nsWindow::BeginMoveDrag(WidgetMouseEvent* aEvent)
{
    NS_ABORT_IF_FALSE(aEvent, "must have event");
    NS_ABORT_IF_FALSE(aEvent->mClass == eMouseEventClass,
                      "event must have correct struct type");

    GdkWindow *gdk_window;
    gint button, screenX, screenY;
    if (!GetDragInfo(aEvent, &gdk_window, &button, &screenX, &screenY)) {
        return NS_ERROR_FAILURE;
    }

    // tell the window manager to start the move
    gdk_window_begin_move_drag(gdk_window, button, screenX, screenY,
                               aEvent->time);

    return NS_OK;
}

NS_IMETHODIMP
nsWindow::BeginResizeDrag(WidgetGUIEvent* aEvent,
                          int32_t aHorizontal,
                          int32_t aVertical)
{
    NS_ENSURE_ARG_POINTER(aEvent);

    if (aEvent->mClass != eMouseEventClass) {
        // you can only begin a resize drag with a mouse event
        return NS_ERROR_INVALID_ARG;
    }

    GdkWindow *gdk_window;
    gint button, screenX, screenY;
    if (!GetDragInfo(aEvent->AsMouseEvent(), &gdk_window, &button,
                     &screenX, &screenY)) {
        return NS_ERROR_FAILURE;
    }

    // work out what GdkWindowEdge we're talking about
    GdkWindowEdge window_edge;
    if (aVertical < 0) {
        if (aHorizontal < 0) {
            window_edge = GDK_WINDOW_EDGE_NORTH_WEST;
        } else if (aHorizontal == 0) {
            window_edge = GDK_WINDOW_EDGE_NORTH;
        } else {
            window_edge = GDK_WINDOW_EDGE_NORTH_EAST;
        }
    } else if (aVertical == 0) {
        if (aHorizontal < 0) {
            window_edge = GDK_WINDOW_EDGE_WEST;
        } else if (aHorizontal == 0) {
            return NS_ERROR_INVALID_ARG;
        } else {
            window_edge = GDK_WINDOW_EDGE_EAST;
        }
    } else {
        if (aHorizontal < 0) {
            window_edge = GDK_WINDOW_EDGE_SOUTH_WEST;
        } else if (aHorizontal == 0) {
            window_edge = GDK_WINDOW_EDGE_SOUTH;
        } else {
            window_edge = GDK_WINDOW_EDGE_SOUTH_EAST;
        }
    }

    // tell the window manager to start the resize
    gdk_window_begin_resize_drag(gdk_window, window_edge, button,
                                 screenX, screenY, aEvent->time);

    return NS_OK;
}

nsIWidget::LayerManager*
nsWindow::GetLayerManager(PLayerTransactionChild* aShadowManager,
                          LayersBackend aBackendHint,
                          LayerManagerPersistence aPersistence,
                          bool* aAllowRetaining)
{
    if (!mLayerManager && eTransparencyTransparent == GetTransparencyMode()) {
        mLayerManager = CreateBasicLayerManager();
    }

    return nsBaseWidget::GetLayerManager(aShadowManager, aBackendHint,
                                         aPersistence, aAllowRetaining);
}

void
nsWindow::ClearCachedResources()
{
    if (mLayerManager &&
        mLayerManager->GetBackendType() == mozilla::layers::LayersBackend::LAYERS_BASIC) {
        mLayerManager->ClearCachedResources();
    }

    GList* children = gdk_window_peek_children(mGdkWindow);
    for (GList* list = children; list; list = list->next) {
        nsWindow* window = get_window_for_gdk_window(GDK_WINDOW(list->data));
        if (window) {
            window->ClearCachedResources();
        }
    }
}

nsresult
nsWindow::SynthesizeNativeMouseEvent(nsIntPoint aPoint,
                                     uint32_t aNativeMessage,
                                     uint32_t aModifierFlags)
{
  if (!mGdkWindow) {
    return NS_OK;
  }

  GdkDisplay* display = gdk_window_get_display(mGdkWindow);

  // When a button-release event is requested, create it here and put it in the
  // event queue. This will not emit a motion event - this needs to be done
  // explicitly *before* requesting a button-release. You will also need to wait
  // for the motion event to be dispatched before requesting a button-release
  // event to maintain the desired event order.
  if (aNativeMessage == GDK_BUTTON_RELEASE) {
    GdkEvent event;
    memset(&event, 0, sizeof(GdkEvent));
    event.type = (GdkEventType)aNativeMessage;
    event.button.button = 1;
    event.button.window = mGdkWindow;
    event.button.time = GDK_CURRENT_TIME;

#if (MOZ_WIDGET_GTK == 3)
    // Get device for event source
    GdkDeviceManager *device_manager = gdk_display_get_device_manager(display);
    event.button.device = gdk_device_manager_get_client_pointer(device_manager);
#endif

    gdk_event_put(&event);
  } else {
    // We don't support specific events other than button-release. In case
    // aNativeMessage != GDK_BUTTON_RELEASE we'll synthesize a motion event
    // that will be emitted by gdk_display_warp_pointer().
    GdkScreen* screen = gdk_window_get_screen(mGdkWindow);
    gdk_display_warp_pointer(display, screen, aPoint.x, aPoint.y);
  }

  return NS_OK;
}