widget/nsBaseWidget.cpp
author Phil Ringnalda <philringnalda@gmail.com>
Wed, 29 Jun 2016 19:35:24 -0700
changeset 303220 48bd14a01b55464215c0bfe973f5657a7b5b7f9c
parent 303200 b8d4fedfd7eb7354b34521b161d430cda684848f
child 303320 d0db1eefa721a977350950b7f561479a466d5154
permissions -rw-r--r--
Back out 7 changesets (bug 1281998) for Windows Marionette crashes Backed out changeset d806fac2c856 (bug 1281998) Backed out changeset b8d4fedfd7eb (bug 1281998) Backed out changeset a72929c0c3ec (bug 1281998) Backed out changeset 74198f88fa37 (bug 1281998) Backed out changeset 54a0e73f6906 (bug 1281998) Backed out changeset 99d1da1293b7 (bug 1281998) Backed out changeset a5a9585754b1 (bug 1281998)

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/UniquePtr.h"
#include "mozilla/TextEventDispatcher.h"
#include "mozilla/TextEventDispatcherListener.h"

#include "mozilla/layers/CompositorBridgeChild.h"
#include "mozilla/layers/CompositorBridgeParent.h"
#include "mozilla/layers/ImageBridgeChild.h"
#include "nsBaseWidget.h"
#include "nsDeviceContext.h"
#include "nsCOMPtr.h"
#include "nsGfxCIID.h"
#include "nsWidgetsCID.h"
#include "nsServiceManagerUtils.h"
#include "nsIKeyEventInPluginCallback.h"
#include "nsIScreenManager.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsISimpleEnumerator.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsIServiceManager.h"
#include "mozilla/Preferences.h"
#include "BasicLayers.h"
#include "ClientLayerManager.h"
#include "mozilla/layers/Compositor.h"
#include "nsIXULRuntime.h"
#include "nsIXULWindow.h"
#include "nsIBaseWindow.h"
#include "nsXULPopupManager.h"
#include "nsIWidgetListener.h"
#include "nsIGfxInfo.h"
#include "npapi.h"
#include "base/thread.h"
#include "prdtoa.h"
#include "prenv.h"
#include "mozilla/Attributes.h"
#include "mozilla/unused.h"
#include "nsContentUtils.h"
#include "gfxPrefs.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/MouseEvents.h"
#include "GLConsts.h"
#include "mozilla/unused.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/VsyncDispatcher.h"
#include "mozilla/layers/APZCTreeManager.h"
#include "mozilla/layers/APZEventState.h"
#include "mozilla/layers/APZThreadUtils.h"
#include "mozilla/layers/ChromeProcessController.h"
#include "mozilla/layers/InputAPZContext.h"
#include "mozilla/layers/APZCCallbackHelper.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/Move.h"
#include "mozilla/Services.h"
#include "mozilla/Snprintf.h"
#include "nsRefPtrHashtable.h"
#include "TouchEvents.h"
#include "WritingModes.h"
#include "InputData.h"
#include "FrameLayerBuilder.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#endif
#include "gfxConfig.h"
#include "mozilla/layers/CompositorSession.h"

#ifdef DEBUG
#include "nsIObserver.h"

static void debug_RegisterPrefCallbacks();

#endif

#ifdef NOISY_WIDGET_LEAKS
static int32_t gNumWidgets;
#endif

#ifdef XP_MACOSX
#include "nsCocoaFeatures.h"
#endif

#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
static nsRefPtrHashtable<nsVoidPtrHashKey, nsIWidget>* sPluginWidgetList;
#endif

nsIRollupListener* nsBaseWidget::gRollupListener = nullptr;

using namespace mozilla::dom;
using namespace mozilla::layers;
using namespace mozilla::ipc;
using namespace mozilla::widget;
using namespace mozilla;
using base::Thread;

nsIContent* nsBaseWidget::mLastRollup = nullptr;
// Global user preference for disabling native theme. Used
// in NativeWindowTheme.
bool            gDisableNativeTheme               = false;

// Async pump timer during injected long touch taps
#define TOUCH_INJECT_PUMP_TIMER_MSEC 50
#define TOUCH_INJECT_LONG_TAP_DEFAULT_MSEC 1500
int32_t nsIWidget::sPointerIdCounter = 0;

// Some statics from nsIWidget.h
/*static*/ uint64_t AutoObserverNotifier::sObserverId = 0;
/*static*/ nsDataHashtable<nsUint64HashKey, nsCOMPtr<nsIObserver>> AutoObserverNotifier::sSavedObservers;

namespace mozilla {
namespace widget {

void
IMENotification::SelectionChangeDataBase::SetWritingMode(
                                        const WritingMode& aWritingMode)
{
  mWritingMode = aWritingMode.mWritingMode;
}

WritingMode
IMENotification::SelectionChangeDataBase::GetWritingMode() const
{
  return WritingMode(mWritingMode);
}

} // namespace widget
} // namespace mozilla

nsAutoRollup::nsAutoRollup()
{
  // remember if mLastRollup was null, and only clear it upon destruction
  // if so. This prevents recursive usage of nsAutoRollup from clearing
  // mLastRollup when it shouldn't.
  wasClear = !nsBaseWidget::mLastRollup;
}

nsAutoRollup::~nsAutoRollup()
{
  if (nsBaseWidget::mLastRollup && wasClear) {
    NS_RELEASE(nsBaseWidget::mLastRollup);
  }
}

NS_IMPL_ISUPPORTS(nsBaseWidget, nsIWidget, nsISupportsWeakReference)

//-------------------------------------------------------------------------
//
// nsBaseWidget constructor
//
//-------------------------------------------------------------------------

nsBaseWidget::nsBaseWidget()
: mWidgetListener(nullptr)
, mAttachedWidgetListener(nullptr)
, mPreviouslyAttachedWidgetListener(nullptr)
, mLayerManager(nullptr)
, mCompositorVsyncDispatcher(nullptr)
, mCursor(eCursor_standard)
, mBorderStyle(eBorderStyle_none)
, mBounds(0,0,0,0)
, mOriginalBounds(nullptr)
, mClipRectCount(0)
, mSizeMode(nsSizeMode_Normal)
, mPopupLevel(ePopupLevelTop)
, mPopupType(ePopupTypeAny)
, mUpdateCursor(true)
, mUseAttachedEvents(false)
, mIMEHasFocus(false)
#if defined(XP_WIN) || defined(XP_MACOSX) || defined(MOZ_WIDGET_GTK)
, mAccessibilityInUseFlag(false)
#endif
{
#ifdef NOISY_WIDGET_LEAKS
  gNumWidgets++;
  printf("WIDGETS+ = %d\n", gNumWidgets);
#endif

#ifdef DEBUG
  debug_RegisterPrefCallbacks();
#endif

#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
  if (!sPluginWidgetList) {
    sPluginWidgetList = new nsRefPtrHashtable<nsVoidPtrHashKey, nsIWidget>();
  }
#endif
  mShutdownObserver = new WidgetShutdownObserver(this);
}

NS_IMPL_ISUPPORTS(WidgetShutdownObserver, nsIObserver)

WidgetShutdownObserver::WidgetShutdownObserver(nsBaseWidget* aWidget) :
  mWidget(aWidget),
  mRegistered(false)
{
  Register();
}

WidgetShutdownObserver::~WidgetShutdownObserver()
{
  // No need to call Unregister(), we can't be destroyed until nsBaseWidget
  // gets torn down. The observer service and nsBaseWidget have a ref on us
  // so nsBaseWidget has to call Unregister and then clear its ref.
}

NS_IMETHODIMP
WidgetShutdownObserver::Observe(nsISupports *aSubject,
                                const char *aTopic,
                                const char16_t *aData)
{
  if (mWidget && !strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
    nsCOMPtr<nsIWidget> kungFuDeathGrip(mWidget);
    mWidget->Shutdown();
  }
  return NS_OK;
}

void
WidgetShutdownObserver::Register()
{
  if (!mRegistered) {
    mRegistered = true;
    nsContentUtils::RegisterShutdownObserver(this);
  }
}

void
WidgetShutdownObserver::Unregister()
{
  if (mRegistered) {
    mWidget = nullptr;
    nsContentUtils::UnregisterShutdownObserver(this);
    mRegistered = false;
  }
}

void
nsBaseWidget::Shutdown()
{
  DestroyCompositor();
  FreeShutdownObserver();
#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
  if (sPluginWidgetList) {
    delete sPluginWidgetList;
    sPluginWidgetList = nullptr;
  }
#endif
}

void nsBaseWidget::DestroyCompositor()
{
  // The compositor shutdown sequence looks like this:
  //  1. CompositorSession calls CompositorBridgeChild::Destroy.
  //  2. CompositorBridgeChild synchronously sends WillClose.
  //  3. CompositorBridgeParent releases some resources (such as the layer
  //     manager, compositor, and widget).
  //  4. CompositorBridgeChild::Destroy returns.
  //  5. Asynchronously, CompositorBridgeParent::ActorDestroy will fire on the
  //     compositor thread when the I/O thread closes the IPC channel.
  //  6. Step 5 will schedule DeferredDestroy on the compositor thread, which
  //     releases the reference CompositorBridgeParent holds to itself.
  //
  // When CompositorSession::Shutdown returns, we assume the compositor is gone
  // or will be gone very soon.
  if (mCompositorSession) {
    ReleaseContentController();
    mAPZC = nullptr;
    mCompositorBridgeChild = nullptr;

    // XXX CompositorBridgeChild and CompositorBridgeParent might be re-created in
    // ClientLayerManager destructor. See bug 1133426.
    RefPtr<CompositorSession> session = mCompositorSession.forget();
    session->Shutdown();

    // Widget is used in CompositorBridgeParent, so we can't release it until
    // it has acknowledged shutdown.
    mCompositorWidgetProxy = nullptr;
  }

  // Can have base widgets that are things like tooltips
  // which don't have CompositorVsyncDispatchers
  if (mCompositorVsyncDispatcher) {
    mCompositorVsyncDispatcher->Shutdown();
    mCompositorVsyncDispatcher = nullptr;
  }
}

void nsBaseWidget::ReleaseContentController()
{
  if (mRootContentController) {
    mRootContentController->Destroy();
    mRootContentController = nullptr;
  }
}

void nsBaseWidget::DestroyLayerManager()
{
  if (mLayerManager) {
    mLayerManager->Destroy();
    mLayerManager = nullptr;
  }
  DestroyCompositor();
}

void
nsBaseWidget::OnRenderingDeviceReset()
{
  if (!mLayerManager || !mCompositorSession) {
    return;
  }

  nsTArray<LayersBackend> backendHints;
  gfxPlatform::GetPlatform()->GetCompositorBackends(ComputeShouldAccelerate(), backendHints);

  // If the existing compositor does not use acceleration, and this widget
  // should not be accelerated, then there's no point in resetting.
  //
  // Note that if this widget should be accelerated, but instead has a basic
  // compositor, we still reset just in case we're now in the position to get
  // accelerated layers again.
  RefPtr<ClientLayerManager> clm = mLayerManager->AsClientLayerManager();
  if (!ComputeShouldAccelerate() &&
      clm->GetTextureFactoryIdentifier().mParentBackend != LayersBackend::LAYERS_BASIC)
  {
    return;
  }

  RefPtr<CompositorBridgeParent> parent = mCompositorSession->GetInProcessBridge();
  if (!parent) {
    return;
  }

  // Recreate the compositor.
  TextureFactoryIdentifier identifier;
  if (!parent->ResetCompositor(backendHints, &identifier)) {
    // No action was taken, so we don't have to do anything.
    return;
  }

  // Invalidate all layers.
  FrameLayerBuilder::InvalidateAllLayers(mLayerManager);

  // Update the texture factory identifier.
  clm->UpdateTextureFactoryIdentifier(identifier);
  if (ShadowLayerForwarder* lf = clm->AsShadowForwarder()) {
    lf->IdentifyTextureHost(identifier);
  }
  ImageBridgeChild::IdentifyCompositorTextureHost(identifier);
}

void
nsBaseWidget::FreeShutdownObserver()
{
  if (mShutdownObserver) {
    mShutdownObserver->Unregister();
  }
  mShutdownObserver = nullptr;
}

//-------------------------------------------------------------------------
//
// nsBaseWidget destructor
//
//-------------------------------------------------------------------------

nsBaseWidget::~nsBaseWidget()
{
  IMEStateManager::WidgetDestroyed(this);

  if (mLayerManager &&
      mLayerManager->GetBackendType() == LayersBackend::LAYERS_BASIC) {
    static_cast<BasicLayerManager*>(mLayerManager.get())->ClearRetainerWidget();
  }

  FreeShutdownObserver();
  DestroyLayerManager();

#ifdef NOISY_WIDGET_LEAKS
  gNumWidgets--;
  printf("WIDGETS- = %d\n", gNumWidgets);
#endif

  delete mOriginalBounds;
}

//-------------------------------------------------------------------------
//
// Basic create.
//
//-------------------------------------------------------------------------
void nsBaseWidget::BaseCreate(nsIWidget* aParent,
                              nsWidgetInitData* aInitData)
{
  static bool gDisableNativeThemeCached = false;
  if (!gDisableNativeThemeCached) {
    Preferences::AddBoolVarCache(&gDisableNativeTheme,
                                 "mozilla.widget.disable-native-theme",
                                 gDisableNativeTheme);
    gDisableNativeThemeCached = true;
  }

  // keep a reference to the device context
  if (nullptr != aInitData) {
    mWindowType = aInitData->mWindowType;
    mBorderStyle = aInitData->mBorderStyle;
    mPopupLevel = aInitData->mPopupLevel;
    mPopupType = aInitData->mPopupHint;
  }

  if (aParent) {
    aParent->AddChild(this);
  }
}

NS_IMETHODIMP nsBaseWidget::CaptureMouse(bool aCapture)
{
  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Accessor functions to get/set the client data
//
//-------------------------------------------------------------------------

nsIWidgetListener* nsBaseWidget::GetWidgetListener()
{
  return mWidgetListener;
}

void nsBaseWidget::SetWidgetListener(nsIWidgetListener* aWidgetListener)
{
  mWidgetListener = aWidgetListener;
}

already_AddRefed<nsIWidget>
nsBaseWidget::CreateChild(const LayoutDeviceIntRect& aRect,
                          nsWidgetInitData* aInitData,
                          bool aForceUseIWidgetParent)
{
  nsIWidget* parent = this;
  nsNativeWidget nativeParent = nullptr;

  if (!aForceUseIWidgetParent) {
    // Use only either parent or nativeParent, not both, to match
    // existing code.  Eventually Create() should be divested of its
    // nativeWidget parameter.
    nativeParent = parent ? parent->GetNativeData(NS_NATIVE_WIDGET) : nullptr;
    parent = nativeParent ? nullptr : parent;
    MOZ_ASSERT(!parent || !nativeParent, "messed up logic");
  }

  nsCOMPtr<nsIWidget> widget;
  if (aInitData && aInitData->mWindowType == eWindowType_popup) {
    widget = AllocateChildPopupWidget();
  } else {
    static NS_DEFINE_IID(kCChildCID, NS_CHILD_CID);
    widget = do_CreateInstance(kCChildCID);
  }

  if (widget &&
      NS_SUCCEEDED(widget->Create(parent, nativeParent, aRect, aInitData))) {
    return widget.forget();
  }

  return nullptr;
}

// Attach a view to our widget which we'll send events to.
NS_IMETHODIMP
nsBaseWidget::AttachViewToTopLevel(bool aUseAttachedEvents)
{
  NS_ASSERTION((mWindowType == eWindowType_toplevel ||
                mWindowType == eWindowType_dialog ||
                mWindowType == eWindowType_invisible ||
                mWindowType == eWindowType_child),
               "Can't attach to window of that type");

  mUseAttachedEvents = aUseAttachedEvents;

  return NS_OK;
}

nsIWidgetListener* nsBaseWidget::GetAttachedWidgetListener()
 {
   return mAttachedWidgetListener;
 }

nsIWidgetListener* nsBaseWidget::GetPreviouslyAttachedWidgetListener()
 {
   return mPreviouslyAttachedWidgetListener;
 }

void nsBaseWidget::SetPreviouslyAttachedWidgetListener(nsIWidgetListener* aListener)
 {
   mPreviouslyAttachedWidgetListener = aListener;
 }

void nsBaseWidget::SetAttachedWidgetListener(nsIWidgetListener* aListener)
 {
   mAttachedWidgetListener = aListener;
 }

//-------------------------------------------------------------------------
//
// Close this nsBaseWidget
//
//-------------------------------------------------------------------------
NS_METHOD nsBaseWidget::Destroy()
{
  // Just in case our parent is the only ref to us
  nsCOMPtr<nsIWidget> kungFuDeathGrip(this);
  // disconnect from the parent
  nsIWidget *parent = GetParent();
  if (parent) {
    parent->RemoveChild(this);
  }

  return NS_OK;
}


//-------------------------------------------------------------------------
//
// Set this nsBaseWidget's parent
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsBaseWidget::SetParent(nsIWidget* aNewParent)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}


//-------------------------------------------------------------------------
//
// Get this nsBaseWidget parent
//
//-------------------------------------------------------------------------
nsIWidget* nsBaseWidget::GetParent(void)
{
  return nullptr;
}

//-------------------------------------------------------------------------
//
// Get this nsBaseWidget top level widget
//
//-------------------------------------------------------------------------
nsIWidget* nsBaseWidget::GetTopLevelWidget()
{
  nsIWidget *topLevelWidget = nullptr, *widget = this;
  while (widget) {
    topLevelWidget = widget;
    widget = widget->GetParent();
  }
  return topLevelWidget;
}

//-------------------------------------------------------------------------
//
// Get this nsBaseWidget's top (non-sheet) parent (if it's a sheet)
//
//-------------------------------------------------------------------------
nsIWidget* nsBaseWidget::GetSheetWindowParent(void)
{
  return nullptr;
}

float nsBaseWidget::GetDPI()
{
  return 96.0f;
}

CSSToLayoutDeviceScale nsIWidget::GetDefaultScale()
{
  double devPixelsPerCSSPixel = DefaultScaleOverride();

  if (devPixelsPerCSSPixel <= 0.0) {
    devPixelsPerCSSPixel = GetDefaultScaleInternal();
  }

  return CSSToLayoutDeviceScale(devPixelsPerCSSPixel);
}

/* static */
double nsIWidget::DefaultScaleOverride()
{
  // The number of device pixels per CSS pixel. A value <= 0 means choose
  // automatically based on the DPI. A positive value is used as-is. This effectively
  // controls the size of a CSS "px".
  double devPixelsPerCSSPixel = -1.0;

  nsAdoptingCString prefString = Preferences::GetCString("layout.css.devPixelsPerPx");
  if (!prefString.IsEmpty()) {
    devPixelsPerCSSPixel = PR_strtod(prefString, nullptr);
  }

  return devPixelsPerCSSPixel;
}

//-------------------------------------------------------------------------
//
// Add a child to the list of children
//
//-------------------------------------------------------------------------
void nsBaseWidget::AddChild(nsIWidget* aChild)
{
  MOZ_RELEASE_ASSERT(!aChild->GetNextSibling() && !aChild->GetPrevSibling(),
                     "aChild not properly removed from its old child list");

  if (!mFirstChild) {
    mFirstChild = mLastChild = aChild;
  } else {
    // append to the list
    MOZ_RELEASE_ASSERT(mLastChild);
    MOZ_RELEASE_ASSERT(!mLastChild->GetNextSibling());
    mLastChild->SetNextSibling(aChild);
    aChild->SetPrevSibling(mLastChild);
    mLastChild = aChild;
  }
}


//-------------------------------------------------------------------------
//
// Remove a child from the list of children
//
//-------------------------------------------------------------------------
void nsBaseWidget::RemoveChild(nsIWidget* aChild)
{
#ifdef DEBUG
#ifdef XP_MACOSX
  // nsCocoaWindow doesn't implement GetParent, so in that case parent will be
  // null and we'll just have to do without this assertion.
  nsIWidget* parent = aChild->GetParent();
  NS_ASSERTION(!parent || parent == this, "Not one of our kids!");
#else
  MOZ_RELEASE_ASSERT(aChild->GetParent() == this, "Not one of our kids!");
#endif
#endif

  if (mLastChild == aChild) {
    mLastChild = mLastChild->GetPrevSibling();
  }
  if (mFirstChild == aChild) {
    mFirstChild = mFirstChild->GetNextSibling();
  }

  // Now remove from the list.  Make sure that we pass ownership of the tail
  // of the list correctly before we have aChild let go of it.
  nsIWidget* prev = aChild->GetPrevSibling();
  nsIWidget* next = aChild->GetNextSibling();
  if (prev) {
    prev->SetNextSibling(next);
  }
  if (next) {
    next->SetPrevSibling(prev);
  }

  aChild->SetNextSibling(nullptr);
  aChild->SetPrevSibling(nullptr);
}


//-------------------------------------------------------------------------
//
// Sets widget's position within its parent's child list.
//
//-------------------------------------------------------------------------
void nsBaseWidget::SetZIndex(int32_t aZIndex)
{
  // Hold a ref to ourselves just in case, since we're going to remove
  // from our parent.
  nsCOMPtr<nsIWidget> kungFuDeathGrip(this);

  mZIndex = aZIndex;

  // reorder this child in its parent's list.
  nsBaseWidget* parent = static_cast<nsBaseWidget*>(GetParent());
  if (parent) {
    parent->RemoveChild(this);
    // Scope sib outside the for loop so we can check it afterward
    nsIWidget* sib = parent->GetFirstChild();
    for ( ; sib; sib = sib->GetNextSibling()) {
      int32_t childZIndex = GetZIndex();
      if (aZIndex < childZIndex) {
        // Insert ourselves before sib
        nsIWidget* prev = sib->GetPrevSibling();
        mNextSibling = sib;
        mPrevSibling = prev;
        sib->SetPrevSibling(this);
        if (prev) {
          prev->SetNextSibling(this);
        } else {
          NS_ASSERTION(sib == parent->mFirstChild, "Broken child list");
          // We've taken ownership of sib, so it's safe to have parent let
          // go of it
          parent->mFirstChild = this;
        }
        PlaceBehind(eZPlacementBelow, sib, false);
        break;
      }
    }
    // were we added to the list?
    if (!sib) {
      parent->AddChild(this);
    }
  }
}

//-------------------------------------------------------------------------
//
// Places widget behind the given widget (platforms must override)
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsBaseWidget::PlaceBehind(nsTopLevelWidgetZPlacement aPlacement,
                                        nsIWidget *aWidget, bool aActivate)
{
  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Maximize, minimize or restore the window. The BaseWidget implementation
// merely stores the state.
//
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseWidget::SetSizeMode(nsSizeMode aMode)
{
  MOZ_ASSERT(aMode == nsSizeMode_Normal ||
             aMode == nsSizeMode_Minimized ||
             aMode == nsSizeMode_Maximized ||
             aMode == nsSizeMode_Fullscreen);
  mSizeMode = aMode;
  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Get this component cursor
//
//-------------------------------------------------------------------------
nsCursor nsBaseWidget::GetCursor()
{
  return mCursor;
}

NS_METHOD nsBaseWidget::SetCursor(nsCursor aCursor)
{
  mCursor = aCursor;
  return NS_OK;
}

NS_IMETHODIMP nsBaseWidget::SetCursor(imgIContainer* aCursor,
                                      uint32_t aHotspotX, uint32_t aHotspotY)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

//-------------------------------------------------------------------------
//
// Window transparency methods
//
//-------------------------------------------------------------------------

void nsBaseWidget::SetTransparencyMode(nsTransparencyMode aMode) {
}

nsTransparencyMode nsBaseWidget::GetTransparencyMode() {
  return eTransparencyOpaque;
}

bool
nsBaseWidget::IsWindowClipRegionEqual(const nsTArray<LayoutDeviceIntRect>& aRects)
{
  return mClipRects &&
         mClipRectCount == aRects.Length() &&
         memcmp(mClipRects.get(), aRects.Elements(), sizeof(LayoutDeviceIntRect)*mClipRectCount) == 0;
}

void
nsBaseWidget::StoreWindowClipRegion(const nsTArray<LayoutDeviceIntRect>& aRects)
{
  mClipRectCount = aRects.Length();
  mClipRects = MakeUnique<LayoutDeviceIntRect[]>(mClipRectCount);
  if (mClipRects) {
    memcpy(mClipRects.get(), aRects.Elements(), sizeof(LayoutDeviceIntRect)*mClipRectCount);
  }
}

void
nsBaseWidget::GetWindowClipRegion(nsTArray<LayoutDeviceIntRect>* aRects)
{
  if (mClipRects) {
    aRects->AppendElements(mClipRects.get(), mClipRectCount);
  } else {
    aRects->AppendElement(LayoutDeviceIntRect(0, 0, mBounds.width, mBounds.height));
  }
}

const LayoutDeviceIntRegion
nsBaseWidget::RegionFromArray(const nsTArray<LayoutDeviceIntRect>& aRects)
{
  LayoutDeviceIntRegion region;
  for (uint32_t i = 0; i < aRects.Length(); ++i) {
    region.Or(region, aRects[i]);
  }
  return region;
}

void
nsBaseWidget::ArrayFromRegion(const LayoutDeviceIntRegion& aRegion,
                              nsTArray<LayoutDeviceIntRect>& aRects)
{
  for (auto iter = aRegion.RectIter(); !iter.Done(); iter.Next()) {
    aRects.AppendElement(iter.Get());
  }
}

nsresult
nsBaseWidget::SetWindowClipRegion(const nsTArray<LayoutDeviceIntRect>& aRects,
                                  bool aIntersectWithExisting)
{
  if (!aIntersectWithExisting) {
    StoreWindowClipRegion(aRects);
  } else {
    // get current rects
    nsTArray<LayoutDeviceIntRect> currentRects;
    GetWindowClipRegion(&currentRects);
    // create region from them
    LayoutDeviceIntRegion currentRegion = RegionFromArray(currentRects);
    // create region from new rects
    LayoutDeviceIntRegion newRegion = RegionFromArray(aRects);
    // intersect regions
    LayoutDeviceIntRegion intersection;
    intersection.And(currentRegion, newRegion);
    // create int rect array from intersection
    nsTArray<LayoutDeviceIntRect> rects;
    ArrayFromRegion(intersection, rects);
    // store
    StoreWindowClipRegion(rects);
  }
  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Set window shadow style
//
//-------------------------------------------------------------------------

NS_IMETHODIMP nsBaseWidget::SetWindowShadowStyle(int32_t aMode)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

//-------------------------------------------------------------------------
//
// Hide window borders/decorations for this widget
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsBaseWidget::HideWindowChrome(bool aShouldHide)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

/* virtual */ void
nsBaseWidget::PerformFullscreenTransition(FullscreenTransitionStage aStage,
                                          uint16_t aDuration,
                                          nsISupports* aData,
                                          nsIRunnable* aCallback)
{
  MOZ_ASSERT_UNREACHABLE(
    "Should never call PerformFullscreenTransition on nsBaseWidget");
}

//-------------------------------------------------------------------------
//
// Put the window into full-screen mode
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsBaseWidget::MakeFullScreen(bool aFullScreen, nsIScreen* aScreen)
{
  HideWindowChrome(aFullScreen);

  if (aFullScreen) {
    if (!mOriginalBounds) {
      mOriginalBounds = new LayoutDeviceIntRect();
    }
    GetScreenBounds(*mOriginalBounds);

    // Move to top-left corner of screen and size to the screen dimensions
    nsCOMPtr<nsIScreen> screen = aScreen;
    if (!screen) {
      screen = GetWidgetScreen();
    }
    if (screen) {
      int32_t left, top, width, height;
      if (NS_SUCCEEDED(screen->GetRectDisplayPix(&left, &top, &width, &height))) {
        Resize(left, top, width, height, true);
      }
    }
  } else if (mOriginalBounds) {
    if (BoundsUseDesktopPixels()) {
      DesktopRect deskRect = *mOriginalBounds / GetDesktopToDeviceScale();
      Resize(deskRect.x, deskRect.y, deskRect.width, deskRect.height, true);
    } else {
      Resize(mOriginalBounds->x, mOriginalBounds->y, mOriginalBounds->width,
             mOriginalBounds->height, true);
    }
  }

  return NS_OK;
}

nsBaseWidget::AutoLayerManagerSetup::AutoLayerManagerSetup(
    nsBaseWidget* aWidget, gfxContext* aTarget,
    BufferMode aDoubleBuffering, ScreenRotation aRotation)
  : mWidget(aWidget)
{
  mLayerManager = static_cast<BasicLayerManager*>(mWidget->GetLayerManager());
  if (mLayerManager) {
    NS_ASSERTION(mLayerManager->GetBackendType() == LayersBackend::LAYERS_BASIC,
      "AutoLayerManagerSetup instantiated for non-basic layer backend!");
    mLayerManager->SetDefaultTarget(aTarget);
    mLayerManager->SetDefaultTargetConfiguration(aDoubleBuffering, aRotation);
  }
}

nsBaseWidget::AutoLayerManagerSetup::~AutoLayerManagerSetup()
{
  if (mLayerManager) {
    NS_ASSERTION(mLayerManager->GetBackendType() == LayersBackend::LAYERS_BASIC,
      "AutoLayerManagerSetup instantiated for non-basic layer backend!");
    mLayerManager->SetDefaultTarget(nullptr);
    mLayerManager->SetDefaultTargetConfiguration(mozilla::layers::BufferMode::BUFFER_NONE, ROTATION_0);
  }
}

bool nsBaseWidget::IsSmallPopup() const
{
  return mWindowType == eWindowType_popup && mPopupType != ePopupTypePanel;
}

bool
nsBaseWidget::ComputeShouldAccelerate()
{
  bool enabled = gfx::gfxConfig::IsEnabled(gfx::Feature::HW_COMPOSITING);
#ifdef MOZ_WIDGET_GTK
  return enabled && !IsSmallPopup();
#else
  return enabled;
#endif
}

bool
nsBaseWidget::UseAPZ()
{
  return (gfxPlatform::AsyncPanZoomEnabled() &&
          (WindowType() == eWindowType_toplevel || WindowType() == eWindowType_child));
}

void nsBaseWidget::CreateCompositor()
{
  LayoutDeviceIntRect rect;
  GetBounds(rect);
  CreateCompositor(rect.width, rect.height);
}

already_AddRefed<GeckoContentController>
nsBaseWidget::CreateRootContentController()
{
  RefPtr<GeckoContentController> controller = new ChromeProcessController(this, mAPZEventState, mAPZC);
  return controller.forget();
}

void nsBaseWidget::ConfigureAPZCTreeManager()
{
  MOZ_ASSERT(mAPZC);

  ConfigureAPZControllerThread();

  mAPZC->SetDPI(GetDPI());

  RefPtr<APZCTreeManager> treeManager = mAPZC;  // for capture by the lambdas

  ContentReceivedInputBlockCallback callback(
      [treeManager](const ScrollableLayerGuid& aGuid,
                    uint64_t aInputBlockId,
                    bool aPreventDefault)
      {
        MOZ_ASSERT(NS_IsMainThread());
        APZThreadUtils::RunOnControllerThread(NewRunnableMethod
                                              <uint64_t, bool>(treeManager,
                                                               &APZCTreeManager::ContentReceivedInputBlock,
                                                               aInputBlockId,
                                                               aPreventDefault));
      });
  mAPZEventState = new APZEventState(this, mozilla::Move(callback));

  mSetAllowedTouchBehaviorCallback = [treeManager](uint64_t aInputBlockId,
                                                   const nsTArray<TouchBehaviorFlags>& aFlags)
  {
    MOZ_ASSERT(NS_IsMainThread());
    APZThreadUtils::RunOnControllerThread(NewRunnableMethod
      <uint64_t,
       StoreCopyPassByLRef<nsTArray<TouchBehaviorFlags>>>(treeManager,
                                                          &APZCTreeManager::SetAllowedTouchBehavior,
                                                          aInputBlockId, aFlags));
  };

  mRootContentController = CreateRootContentController();
  if (mRootContentController) {
    mCompositorSession->SetContentController(mRootContentController);
  }

  // When APZ is enabled, we can actually enable raw touch events because we
  // have code that can deal with them properly. If APZ is not enabled, this
  // function doesn't get called.
  if (Preferences::GetInt("dom.w3c_touch_events.enabled", 0) ||
      Preferences::GetBool("dom.w3c_pointer_events.enabled", false)) {
    RegisterTouchWindow();
  }
}

void nsBaseWidget::ConfigureAPZControllerThread()
{
  // By default the controller thread is the main thread.
  APZThreadUtils::SetControllerThread(MessageLoop::current());
}

void
nsBaseWidget::SetConfirmedTargetAPZC(uint64_t aInputBlockId,
                                     const nsTArray<ScrollableLayerGuid>& aTargets) const
{
  // Need to specifically bind this since it's overloaded.
  void (APZCTreeManager::*setTargetApzcFunc)(uint64_t, const nsTArray<ScrollableLayerGuid>&)
          = &APZCTreeManager::SetTargetAPZC;
  APZThreadUtils::RunOnControllerThread(NewRunnableMethod
    <uint64_t, StoreCopyPassByRRef<nsTArray<ScrollableLayerGuid>>>(mAPZC,
                                                                   setTargetApzcFunc,
                                                                   aInputBlockId, aTargets));
}

void
nsBaseWidget::UpdateZoomConstraints(const uint32_t& aPresShellId,
                                    const FrameMetrics::ViewID& aViewId,
                                    const Maybe<ZoomConstraints>& aConstraints)
{
  if (!mCompositorSession || !mAPZC) {
    if (mInitialZoomConstraints) {
      MOZ_ASSERT(mInitialZoomConstraints->mPresShellID == aPresShellId);
      MOZ_ASSERT(mInitialZoomConstraints->mViewID == aViewId);
      if (!aConstraints) {
        mInitialZoomConstraints.reset();
      }
    }

    if (aConstraints) {
      // We have some constraints, but the compositor and APZC aren't created yet.
      // Save these so we can use them later.
      mInitialZoomConstraints = Some(InitialZoomConstraints(aPresShellId, aViewId, aConstraints.ref()));
    }
    return;
  }
  uint64_t layersId = mCompositorSession->RootLayerTreeId();
  mAPZC->UpdateZoomConstraints(ScrollableLayerGuid(layersId, aPresShellId, aViewId),
                               aConstraints);
}

bool
nsBaseWidget::AsyncPanZoomEnabled() const
{
  return !!mAPZC;
}

nsEventStatus
nsBaseWidget::ProcessUntransformedAPZEvent(WidgetInputEvent* aEvent,
                                           const ScrollableLayerGuid& aGuid,
                                           uint64_t aInputBlockId,
                                           nsEventStatus aApzResponse)
{
  MOZ_ASSERT(NS_IsMainThread());
  InputAPZContext context(aGuid, aInputBlockId, aApzResponse);

  // If this is an event that the APZ has targeted to an APZC in the root
  // process, apply that APZC's callback-transform before dispatching the
  // event. If the event is instead targeted to an APZC in the child process,
  // the transform will be applied in the child process before dispatching
  // the event there (see e.g. TabChild::RecvRealTouchEvent()).
  if (aGuid.mLayersId == mCompositorSession->RootLayerTreeId()) {
    APZCCallbackHelper::ApplyCallbackTransform(*aEvent, aGuid,
        GetDefaultScale());
  }

  // Make a copy of the original event for the APZCCallbackHelper helpers that
  // we call later, because the event passed to DispatchEvent can get mutated in
  // ways that we don't want (i.e. touch points can get stripped out).
  nsEventStatus status;
  UniquePtr<WidgetEvent> original(aEvent->Duplicate());
  DispatchEvent(aEvent, status);

  if (mAPZC && !context.WasRoutedToChildProcess() && aInputBlockId) {
    // EventStateManager did not route the event into the child process.
    // It's safe to communicate to APZ that the event has been processed.
    // TODO: Eventually we'll be able to move the SendSetTargetAPZCNotification
    // call into APZEventState::Process*Event() as well.
    if (WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent()) {
      if (touchEvent->mMessage == eTouchStart) {
        if (gfxPrefs::TouchActionEnabled()) {
          APZCCallbackHelper::SendSetAllowedTouchBehaviorNotification(this,
              *(original->AsTouchEvent()), aInputBlockId,
              mSetAllowedTouchBehaviorCallback);
        }
        APZCCallbackHelper::SendSetTargetAPZCNotification(this, GetDocument(),
            *(original->AsTouchEvent()), aGuid, aInputBlockId);
      }
      mAPZEventState->ProcessTouchEvent(*touchEvent, aGuid, aInputBlockId,
          aApzResponse, status);
    } else if (WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent()) {
      MOZ_ASSERT(wheelEvent->mFlags.mHandledByAPZ);
      APZCCallbackHelper::SendSetTargetAPZCNotification(this, GetDocument(),
          *(original->AsWheelEvent()), aGuid, aInputBlockId);
      if (wheelEvent->mCanTriggerSwipe) {
        ReportSwipeStarted(aInputBlockId, wheelEvent->TriggersSwipe());
      }
      mAPZEventState->ProcessWheelEvent(*wheelEvent, aGuid, aInputBlockId);
    } else if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
      MOZ_ASSERT(mouseEvent->mFlags.mHandledByAPZ);
      APZCCallbackHelper::SendSetTargetAPZCNotification(this, GetDocument(),
          *(original->AsMouseEvent()), aGuid, aInputBlockId);
      mAPZEventState->ProcessMouseEvent(*mouseEvent, aGuid, aInputBlockId);
    }
  }

  return status;
}

class DispatchWheelEventOnMainThread : public Runnable
{
public:
  DispatchWheelEventOnMainThread(const ScrollWheelInput& aWheelInput,
                                 nsBaseWidget* aWidget,
                                 nsEventStatus aAPZResult,
                                 uint64_t aInputBlockId,
                                 ScrollableLayerGuid aGuid)
    : mWheelInput(aWheelInput)
    , mWidget(aWidget)
    , mAPZResult(aAPZResult)
    , mInputBlockId(aInputBlockId)
    , mGuid(aGuid)
  {
  }

  NS_IMETHOD Run() override
  {
    WidgetWheelEvent wheelEvent = mWheelInput.ToWidgetWheelEvent(mWidget);
    mWidget->ProcessUntransformedAPZEvent(&wheelEvent, mGuid, mInputBlockId, mAPZResult);
    return NS_OK;
  }

private:
  ScrollWheelInput mWheelInput;
  nsBaseWidget* mWidget;
  nsEventStatus mAPZResult;
  uint64_t mInputBlockId;
  ScrollableLayerGuid mGuid;
};

class DispatchWheelInputOnControllerThread : public Runnable
{
public:
  DispatchWheelInputOnControllerThread(const WidgetWheelEvent& aWheelEvent,
                                       APZCTreeManager* aAPZC,
                                       nsBaseWidget* aWidget)
    : mMainMessageLoop(MessageLoop::current())
    , mWheelInput(aWheelEvent)
    , mAPZC(aAPZC)
    , mWidget(aWidget)
    , mInputBlockId(0)
  {
  }

  NS_IMETHOD Run() override
  {
    mAPZResult = mAPZC->ReceiveInputEvent(mWheelInput, &mGuid, &mInputBlockId);
    if (mAPZResult == nsEventStatus_eConsumeNoDefault) {
      return NS_OK;
    }
    RefPtr<Runnable> r = new DispatchWheelEventOnMainThread(mWheelInput, mWidget, mAPZResult, mInputBlockId, mGuid);
    mMainMessageLoop->PostTask(r.forget());
    return NS_OK;
  }

private:
  MessageLoop* mMainMessageLoop;
  ScrollWheelInput mWheelInput;
  RefPtr<APZCTreeManager> mAPZC;
  nsBaseWidget* mWidget;
  nsEventStatus mAPZResult;
  uint64_t mInputBlockId;
  ScrollableLayerGuid mGuid;
};

nsEventStatus
nsBaseWidget::DispatchInputEvent(WidgetInputEvent* aEvent)
{
  MOZ_ASSERT(NS_IsMainThread());
  if (mAPZC) {
    if (APZThreadUtils::IsControllerThread()) {
      uint64_t inputBlockId = 0;
      ScrollableLayerGuid guid;

      nsEventStatus result = mAPZC->ReceiveInputEvent(*aEvent, &guid, &inputBlockId);
      if (result == nsEventStatus_eConsumeNoDefault) {
          return result;
      }
      return ProcessUntransformedAPZEvent(aEvent, guid, inputBlockId, result);
    } else {
      WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
      if (wheelEvent) {
        RefPtr<Runnable> r = new DispatchWheelInputOnControllerThread(*wheelEvent, mAPZC, this);
        APZThreadUtils::RunOnControllerThread(r.forget());
        return nsEventStatus_eConsumeDoDefault;
      }
      MOZ_CRASH();
    }
  }

  nsEventStatus status;
  DispatchEvent(aEvent, status);
  return status;
}

void
nsBaseWidget::DispatchEventToAPZOnly(mozilla::WidgetInputEvent* aEvent)
{
  MOZ_ASSERT(NS_IsMainThread());
  if (mAPZC) {
    MOZ_ASSERT(APZThreadUtils::IsControllerThread());
    uint64_t inputBlockId = 0;
    ScrollableLayerGuid guid;
    mAPZC->ReceiveInputEvent(*aEvent, &guid, &inputBlockId);
  }
}

nsIDocument*
nsBaseWidget::GetDocument() const
{
  if (mWidgetListener) {
    if (nsIPresShell* presShell = mWidgetListener->GetPresShell()) {
      return presShell->GetDocument();
    }
  }
  return nullptr;
}

void nsBaseWidget::CreateCompositorVsyncDispatcher()
{
  // Parent directly listens to the vsync source whereas
  // child process communicate via IPC
  // Should be called AFTER gfxPlatform is initialized
  if (XRE_IsParentProcess()) {
    mCompositorVsyncDispatcher = new CompositorVsyncDispatcher();
  }
}

CompositorVsyncDispatcher*
nsBaseWidget::GetCompositorVsyncDispatcher()
{
  return mCompositorVsyncDispatcher;
}

void nsBaseWidget::CreateCompositor(int aWidth, int aHeight)
{
  // This makes sure that gfxPlatforms gets initialized if it hasn't by now.
  gfxPlatform::GetPlatform();

  MOZ_ASSERT(gfxPlatform::UsesOffMainThreadCompositing(),
             "This function assumes OMTC");

  MOZ_ASSERT(!mCompositorSession && !mCompositorBridgeChild,
    "Should have properly cleaned up the previous PCompositor pair beforehand");

  if (mCompositorBridgeChild) {
    mCompositorBridgeChild->Destroy();
  }

  // Recreating this is tricky, as we may still have an old and we need
  // to make sure it's properly destroyed by calling DestroyCompositor!

  // If we've already received a shutdown notification, don't try
  // create a new compositor.
  if (!mShutdownObserver) {
    return;
  }

  CreateCompositorVsyncDispatcher();

  if (!mCompositorWidgetProxy) {
    mCompositorWidgetProxy = NewCompositorWidgetProxy();
  }

  RefPtr<ClientLayerManager> lm = new ClientLayerManager(this);

  gfx::GPUProcessManager* gpu = gfx::GPUProcessManager::Get();
  mCompositorSession = gpu->CreateTopLevelCompositor(
    mCompositorWidgetProxy,
    lm,
    GetDefaultScale(),
    UseAPZ(),
    UseExternalCompositingSurface(),
    gfx::IntSize(aWidth, aHeight));
  mCompositorBridgeChild = mCompositorSession->GetCompositorBridgeChild();

  mAPZC = mCompositorSession->GetAPZCTreeManager();
  if (mAPZC) {
    ConfigureAPZCTreeManager();
  }

  if (mInitialZoomConstraints) {
    UpdateZoomConstraints(mInitialZoomConstraints->mPresShellID,
                          mInitialZoomConstraints->mViewID,
                          Some(mInitialZoomConstraints->mConstraints));
    mInitialZoomConstraints.reset();
  }

  TextureFactoryIdentifier textureFactoryIdentifier;
  PLayerTransactionChild* shadowManager = nullptr;

  nsTArray<LayersBackend> backendHints;
  gfxPlatform::GetPlatform()->GetCompositorBackends(ComputeShouldAccelerate(), backendHints);

  bool success = false;
  if (!backendHints.IsEmpty()) {
    shadowManager = mCompositorBridgeChild->SendPLayerTransactionConstructor(
      backendHints, 0, &textureFactoryIdentifier, &success);
  }

  ShadowLayerForwarder* lf = lm->AsShadowForwarder();

  if (!success || !lf) {
    NS_WARNING("Failed to create an OMT compositor.");
    DestroyCompositor();
    mLayerManager = nullptr;
    return;
  }

  lf->SetShadowManager(shadowManager);
  lf->IdentifyTextureHost(textureFactoryIdentifier);
  ImageBridgeChild::IdentifyCompositorTextureHost(textureFactoryIdentifier);
  WindowUsesOMTC();

  mLayerManager = lm.forget();

  if (mWindowType == eWindowType_toplevel) {
    // Only track compositors for top-level windows, since other window types
    // may use the basic compositor.
    gfxPlatform::GetPlatform()->NotifyCompositorCreated(mLayerManager->GetCompositorBackendType());
  }
}

bool nsBaseWidget::ShouldUseOffMainThreadCompositing()
{
  return gfxPlatform::UsesOffMainThreadCompositing();
}

LayerManager* nsBaseWidget::GetLayerManager(PLayerTransactionChild* aShadowManager,
                                            LayersBackend aBackendHint,
                                            LayerManagerPersistence aPersistence,
                                            bool* aAllowRetaining)
{
  if (!mLayerManager) {
    if (!mShutdownObserver) {
      // We are shutting down, do not try to re-create a LayerManager
      return nullptr;
    }
    // Try to use an async compositor first, if possible
    if (ShouldUseOffMainThreadCompositing()) {
      // e10s uses the parameter to pass in the shadow manager from the TabChild
      // so we don't expect to see it there since this doesn't support e10s.
      NS_ASSERTION(aShadowManager == nullptr, "Async Compositor not supported with e10s");
      CreateCompositor();
    }

    if (!mLayerManager) {
      mLayerManager = CreateBasicLayerManager();
    }
  }
  if (aAllowRetaining) {
    *aAllowRetaining = true;
  }
  return mLayerManager;
}

LayerManager* nsBaseWidget::CreateBasicLayerManager()
{
  return new BasicLayerManager(this);
}

CompositorBridgeChild* nsBaseWidget::GetRemoteRenderer()
{
  return mCompositorBridgeChild;
}

already_AddRefed<gfx::DrawTarget>
nsBaseWidget::StartRemoteDrawing()
{
  return nullptr;
}

uint32_t
nsBaseWidget::GetGLFrameBufferFormat()
{
  return LOCAL_GL_RGBA;
}

mozilla::widget::CompositorWidgetProxy*
nsBaseWidget::NewCompositorWidgetProxy()
{
  return new mozilla::widget::CompositorWidgetProxyWrapper(this);
}

//-------------------------------------------------------------------------
//
// Destroy the window
//
//-------------------------------------------------------------------------
void nsBaseWidget::OnDestroy()
{
  if (mTextEventDispatcher) {
    mTextEventDispatcher->OnDestroyWidget();
    // Don't release it until this widget actually released because after this
    // is called, TextEventDispatcher() may create it again.
  }

  // If this widget is being destroyed, let the APZ code know to drop references
  // to this widget. Callers of this function all should be holding a deathgrip
  // on this widget already.
  ReleaseContentController();
}

NS_METHOD nsBaseWidget::SetWindowClass(const nsAString& xulWinType)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_METHOD nsBaseWidget::MoveClient(double aX, double aY)
{
  LayoutDeviceIntPoint clientOffset(GetClientOffset());

  // GetClientOffset returns device pixels; scale back to desktop pixels
  // if that's what this widget uses for the Move/Resize APIs
  if (BoundsUseDesktopPixels()) {
    DesktopPoint desktopOffset = clientOffset / GetDesktopToDeviceScale();
    return Move(aX - desktopOffset.x, aY - desktopOffset.y);
  } else {
    return Move(aX - clientOffset.x, aY - clientOffset.y);
  }
}

NS_METHOD nsBaseWidget::ResizeClient(double aWidth,
                                     double aHeight,
                                     bool aRepaint)
{
  NS_ASSERTION((aWidth >=0) , "Negative width passed to ResizeClient");
  NS_ASSERTION((aHeight >=0), "Negative height passed to ResizeClient");

  LayoutDeviceIntRect clientBounds;
  GetClientBounds(clientBounds);

  // GetClientBounds and mBounds are device pixels; scale back to desktop pixels
  // if that's what this widget uses for the Move/Resize APIs
  if (BoundsUseDesktopPixels()) {
    DesktopSize desktopDelta =
      (LayoutDeviceIntSize(mBounds.width, mBounds.height) -
       clientBounds.Size()) / GetDesktopToDeviceScale();
    return Resize(aWidth + desktopDelta.width, aHeight + desktopDelta.height,
                  aRepaint);
  } else {
    return Resize(mBounds.width + (aWidth - clientBounds.width),
                  mBounds.height + (aHeight - clientBounds.height), aRepaint);
  }
}

NS_METHOD nsBaseWidget::ResizeClient(double aX,
                                     double aY,
                                     double aWidth,
                                     double aHeight,
                                     bool aRepaint)
{
  NS_ASSERTION((aWidth >=0) , "Negative width passed to ResizeClient");
  NS_ASSERTION((aHeight >=0), "Negative height passed to ResizeClient");

  LayoutDeviceIntRect clientBounds;
  GetClientBounds(clientBounds);

  LayoutDeviceIntPoint clientOffset(GetClientOffset());

  if (BoundsUseDesktopPixels()) {
    DesktopToLayoutDeviceScale scale = GetDesktopToDeviceScale();
    DesktopPoint desktopOffset = clientOffset / scale;
    DesktopSize desktopDelta =
      (LayoutDeviceIntSize(mBounds.width, mBounds.height) -
       clientBounds.Size()) / scale;
    return Resize(aX - desktopOffset.x, aY - desktopOffset.y,
                  aWidth + desktopDelta.width, aHeight + desktopDelta.height,
                  aRepaint);
  } else {
    return Resize(aX - clientOffset.x, aY - clientOffset.y,
                  aWidth + mBounds.width - clientBounds.width,
                  aHeight + mBounds.height - clientBounds.height,
                  aRepaint);
  }
}

//-------------------------------------------------------------------------
//
// Bounds
//
//-------------------------------------------------------------------------

/**
* If the implementation of nsWindow supports borders this method MUST be overridden
*
**/
NS_METHOD nsBaseWidget::GetClientBounds(LayoutDeviceIntRect &aRect)
{
  return GetBounds(aRect);
}

/**
* If the implementation of nsWindow supports borders this method MUST be overridden
*
**/
NS_METHOD nsBaseWidget::GetBounds(LayoutDeviceIntRect &aRect)
{
  aRect = mBounds;
  return NS_OK;
}

/**
* If the implementation of nsWindow uses a local coordinate system within the window,
* this method must be overridden
*
**/
NS_METHOD nsBaseWidget::GetScreenBounds(LayoutDeviceIntRect& aRect)
{
  return GetBounds(aRect);
}

NS_METHOD nsBaseWidget::GetRestoredBounds(LayoutDeviceIntRect& aRect)
{
  if (SizeMode() != nsSizeMode_Normal) {
    return NS_ERROR_FAILURE;
  }
  return GetScreenBounds(aRect);
}

LayoutDeviceIntPoint
nsBaseWidget::GetClientOffset()
{
  return LayoutDeviceIntPoint(0, 0);
}

NS_IMETHODIMP
nsBaseWidget::GetNonClientMargins(LayoutDeviceIntMargin &margins)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsBaseWidget::SetNonClientMargins(LayoutDeviceIntMargin &margins)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_METHOD nsBaseWidget::EnableDragDrop(bool aEnable)
{
  return NS_OK;
}

uint32_t nsBaseWidget::GetMaxTouchPoints() const
{
  return 0;
}

NS_METHOD nsBaseWidget::SetModal(bool aModal)
{
  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsBaseWidget::GetAttention(int32_t aCycleCount) {
    return NS_OK;
}

bool
nsBaseWidget::HasPendingInputEvent()
{
  return false;
}

NS_IMETHODIMP
nsBaseWidget::SetIcon(const nsAString&)
{
  return NS_OK;
}

NS_IMETHODIMP
nsBaseWidget::SetWindowTitlebarColor(nscolor aColor, bool aActive)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

bool
nsBaseWidget::ShowsResizeIndicator(LayoutDeviceIntRect* aResizerRect)
{
  return false;
}

/**
 * Modifies aFile to point at an icon file with the given name and suffix.  The
 * suffix may correspond to a file extension with leading '.' if appropriate.
 * Returns true if the icon file exists and can be read.
 */
static bool
ResolveIconNameHelper(nsIFile *aFile,
                      const nsAString &aIconName,
                      const nsAString &aIconSuffix)
{
  aFile->Append(NS_LITERAL_STRING("icons"));
  aFile->Append(NS_LITERAL_STRING("default"));
  aFile->Append(aIconName + aIconSuffix);

  bool readable;
  return NS_SUCCEEDED(aFile->IsReadable(&readable)) && readable;
}

/**
 * Resolve the given icon name into a local file object.  This method is
 * intended to be called by subclasses of nsBaseWidget.  aIconSuffix is a
 * platform specific icon file suffix (e.g., ".ico" under Win32).
 *
 * If no file is found matching the given parameters, then null is returned.
 */
void
nsBaseWidget::ResolveIconName(const nsAString &aIconName,
                              const nsAString &aIconSuffix,
                              nsIFile **aResult)
{
  *aResult = nullptr;

  nsCOMPtr<nsIProperties> dirSvc = do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID);
  if (!dirSvc)
    return;

  // first check auxilary chrome directories

  nsCOMPtr<nsISimpleEnumerator> dirs;
  dirSvc->Get(NS_APP_CHROME_DIR_LIST, NS_GET_IID(nsISimpleEnumerator),
              getter_AddRefs(dirs));
  if (dirs) {
    bool hasMore;
    while (NS_SUCCEEDED(dirs->HasMoreElements(&hasMore)) && hasMore) {
      nsCOMPtr<nsISupports> element;
      dirs->GetNext(getter_AddRefs(element));
      if (!element)
        continue;
      nsCOMPtr<nsIFile> file = do_QueryInterface(element);
      if (!file)
        continue;
      if (ResolveIconNameHelper(file, aIconName, aIconSuffix)) {
        NS_ADDREF(*aResult = file);
        return;
      }
    }
  }

  // then check the main app chrome directory

  nsCOMPtr<nsIFile> file;
  dirSvc->Get(NS_APP_CHROME_DIR, NS_GET_IID(nsIFile),
              getter_AddRefs(file));
  if (file && ResolveIconNameHelper(file, aIconName, aIconSuffix))
    NS_ADDREF(*aResult = file);
}

NS_IMETHODIMP
nsBaseWidget::BeginResizeDrag(WidgetGUIEvent* aEvent,
                              int32_t aHorizontal,
                              int32_t aVertical)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsBaseWidget::BeginMoveDrag(WidgetMouseEvent* aEvent)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

void nsBaseWidget::SetSizeConstraints(const SizeConstraints& aConstraints)
{
  mSizeConstraints = aConstraints;
  // We can't ensure that the size is honored at this point because we're
  // probably in the middle of a reflow.
}

const widget::SizeConstraints nsBaseWidget::GetSizeConstraints()
{
  return mSizeConstraints;
}

// static
nsIRollupListener*
nsBaseWidget::GetActiveRollupListener()
{
  // If set, then this is likely an <html:select> dropdown.
  if (gRollupListener)
    return gRollupListener;

  return nsXULPopupManager::GetInstance();
}

void
nsBaseWidget::NotifyWindowDestroyed()
{
  if (!mWidgetListener)
    return;

  nsCOMPtr<nsIXULWindow> window = mWidgetListener->GetXULWindow();
  nsCOMPtr<nsIBaseWindow> xulWindow(do_QueryInterface(window));
  if (xulWindow) {
    xulWindow->Destroy();
  }
}

void
nsBaseWidget::NotifySizeMoveDone()
{
  if (!mWidgetListener || mWidgetListener->GetXULWindow())
    return;

  nsIPresShell* presShell = mWidgetListener->GetPresShell();
  if (presShell) {
    presShell->WindowSizeMoveDone();
  }
}

void
nsBaseWidget::NotifyWindowMoved(int32_t aX, int32_t aY)
{
  if (mWidgetListener) {
    mWidgetListener->WindowMoved(this, aX, aY);
  }

  if (mIMEHasFocus && GetIMEUpdatePreference().WantPositionChanged()) {
    NotifyIME(IMENotification(IMEMessage::NOTIFY_IME_OF_POSITION_CHANGE));
  }
}

void
nsBaseWidget::NotifySysColorChanged()
{
  if (!mWidgetListener || mWidgetListener->GetXULWindow())
    return;

  nsIPresShell* presShell = mWidgetListener->GetPresShell();
  if (presShell) {
    presShell->SysColorChanged();
  }
}

void
nsBaseWidget::NotifyThemeChanged()
{
  if (!mWidgetListener || mWidgetListener->GetXULWindow())
    return;

  nsIPresShell* presShell = mWidgetListener->GetPresShell();
  if (presShell) {
    presShell->ThemeChanged();
  }
}

void
nsBaseWidget::NotifyUIStateChanged(UIStateChangeType aShowAccelerators,
                                   UIStateChangeType aShowFocusRings)
{
  if (nsIDocument* doc = GetDocument()) {
    nsPIDOMWindowOuter* win = doc->GetWindow();
    if (win) {
      win->SetKeyboardIndicators(aShowAccelerators, aShowFocusRings);
    }
  }
}

NS_IMETHODIMP
nsBaseWidget::NotifyIME(const IMENotification& aIMENotification)
{
  switch (aIMENotification.mMessage) {
    case REQUEST_TO_COMMIT_COMPOSITION:
    case REQUEST_TO_CANCEL_COMPOSITION:
      // Currently, if native IME handler doesn't use TextEventDispatcher,
      // the request may be notified to mTextEventDispatcher or native IME
      // directly.  Therefore, if mTextEventDispatcher has a composition,
      // the request should be handled by the mTextEventDispatcher.
      if (mTextEventDispatcher && mTextEventDispatcher->IsComposing()) {
        return mTextEventDispatcher->NotifyIME(aIMENotification);
      }
      // Otherwise, it should be handled by native IME.
      return NotifyIMEInternal(aIMENotification);
    default: {
      if (aIMENotification.mMessage == NOTIFY_IME_OF_FOCUS) {
        mIMEHasFocus = true;
      }
      EnsureTextEventDispatcher();
      // If the platform specific widget uses TextEventDispatcher for handling
      // native IME and keyboard events, IME event handler should be notified
      // of the notification via TextEventDispatcher.  Otherwise, on the other
      // platforms which have not used TextEventDispatcher yet, IME event
      // handler should be notified by the old path (NotifyIMEInternal).
      nsresult rv = mTextEventDispatcher->NotifyIME(aIMENotification);
      nsresult rv2 = NotifyIMEInternal(aIMENotification);
      if (aIMENotification.mMessage == NOTIFY_IME_OF_BLUR) {
        mIMEHasFocus = false;
      }
      return rv2 == NS_ERROR_NOT_IMPLEMENTED ? rv : rv2;
    }
  }
}

void
nsBaseWidget::EnsureTextEventDispatcher()
{
  if (mTextEventDispatcher) {
    return;
  }
  mTextEventDispatcher = new TextEventDispatcher(this);
}

NS_IMETHODIMP_(nsIWidget::TextEventDispatcher*)
nsBaseWidget::GetTextEventDispatcher()
{
  EnsureTextEventDispatcher();
  return mTextEventDispatcher;
}

void*
nsBaseWidget::GetPseudoIMEContext()
{
  TextEventDispatcher* dispatcher = GetTextEventDispatcher();
  if (!dispatcher) {
    return nullptr;
  }
  return dispatcher->GetPseudoIMEContext();
}

NS_IMETHODIMP_(TextEventDispatcherListener*)
nsBaseWidget::GetNativeTextEventDispatcherListener()
{
  // TODO: If all platforms supported use of TextEventDispatcher for handling
  //       native IME and keyboard events, this method should be removed since
  //       in such case, this is overridden by all the subclasses.
  return nullptr;
}

void
nsBaseWidget::ZoomToRect(const uint32_t& aPresShellId,
                         const FrameMetrics::ViewID& aViewId,
                         const CSSRect& aRect,
                         const uint32_t& aFlags)
{
  if (!mCompositorSession || !mAPZC) {
    return;
  }
  uint64_t layerId = mCompositorSession->RootLayerTreeId();
  mAPZC->ZoomToRect(ScrollableLayerGuid(layerId, aPresShellId, aViewId), aRect, aFlags);
}

#ifdef ACCESSIBILITY

#if defined(XP_WIN) || defined(XP_MACOSX) || defined(MOZ_WIDGET_GTK)
// defined in nsAppRunner.cpp
extern const char* kAccessibilityLastRunDatePref;

static inline uint32_t
PRTimeToSeconds(PRTime t_usec)
{
  PRTime usec_per_sec = PR_USEC_PER_SEC;
  return uint32_t(t_usec /= usec_per_sec);
}
#endif

a11y::Accessible*
nsBaseWidget::GetRootAccessible()
{
  NS_ENSURE_TRUE(mWidgetListener, nullptr);

  nsIPresShell* presShell = mWidgetListener->GetPresShell();
  NS_ENSURE_TRUE(presShell, nullptr);

  // If container is null then the presshell is not active. This often happens
  // when a preshell is being held onto for fastback.
  nsPresContext* presContext = presShell->GetPresContext();
  NS_ENSURE_TRUE(presContext->GetContainerWeak(), nullptr);

  // Accessible creation might be not safe so use IsSafeToRunScript to
  // make sure it's not created at unsafe times.
  nsCOMPtr<nsIAccessibilityService> accService =
    services::GetAccessibilityService();
  if (accService) {
#if defined(XP_WIN) || defined(XP_MACOSX) || defined(MOZ_WIDGET_GTK)
    if (!mAccessibilityInUseFlag) {
      mAccessibilityInUseFlag = true;
      uint32_t now = PRTimeToSeconds(PR_Now());
      Preferences::SetInt(kAccessibilityLastRunDatePref, now);
    }
#endif
    return accService->GetRootDocumentAccessible(presShell, nsContentUtils::IsSafeToRunScript());
  }

  return nullptr;
}

#endif // ACCESSIBILITY

void
nsBaseWidget::StartAsyncScrollbarDrag(const AsyncDragMetrics& aDragMetrics)
{
  if (!AsyncPanZoomEnabled()) {
    return;
  }

  MOZ_ASSERT(XRE_IsParentProcess() && mCompositorSession);

  int layersId = mCompositorSession->RootLayerTreeId();;
  ScrollableLayerGuid guid(layersId, aDragMetrics.mPresShellId, aDragMetrics.mViewId);

  APZThreadUtils::RunOnControllerThread(NewRunnableMethod
    <ScrollableLayerGuid, AsyncDragMetrics>(mAPZC,
                                            &APZCTreeManager::StartScrollbarDrag,
                                            guid, aDragMetrics));
}

already_AddRefed<nsIScreen>
nsBaseWidget::GetWidgetScreen()
{
  nsCOMPtr<nsIScreenManager> screenManager;
  screenManager = do_GetService("@mozilla.org/gfx/screenmanager;1");
  if (!screenManager) {
    return nullptr;
  }

  LayoutDeviceIntRect bounds;
  GetScreenBounds(bounds);
  DesktopIntRect deskBounds = RoundedToInt(bounds / GetDesktopToDeviceScale());
  nsCOMPtr<nsIScreen> screen;
  screenManager->ScreenForRect(deskBounds.x, deskBounds.y,
                               deskBounds.width, deskBounds.height,
                               getter_AddRefs(screen));
  return screen.forget();
}

nsresult
nsIWidget::SynthesizeNativeTouchTap(LayoutDeviceIntPoint aPoint, bool aLongTap,
                                    nsIObserver* aObserver)
{
  AutoObserverNotifier notifier(aObserver, "touchtap");

  if (sPointerIdCounter > TOUCH_INJECT_MAX_POINTS) {
    sPointerIdCounter = 0;
  }
  int pointerId = sPointerIdCounter;
  sPointerIdCounter++;
  nsresult rv = SynthesizeNativeTouchPoint(pointerId, TOUCH_CONTACT,
                                           aPoint, 1.0, 90, nullptr);
  if (NS_FAILED(rv)) {
    return rv;
  }

  if (!aLongTap) {
    nsresult rv = SynthesizeNativeTouchPoint(pointerId, TOUCH_REMOVE,
                                             aPoint, 0, 0, nullptr);
    return rv;
  }

  // initiate a long tap
  int elapse = Preferences::GetInt("ui.click_hold_context_menus.delay",
                                   TOUCH_INJECT_LONG_TAP_DEFAULT_MSEC);
  if (!mLongTapTimer) {
    mLongTapTimer = do_CreateInstance(NS_TIMER_CONTRACTID, &rv);
    if (NS_FAILED(rv)) {
      SynthesizeNativeTouchPoint(pointerId, TOUCH_CANCEL,
                                 aPoint, 0, 0, nullptr);
      return NS_ERROR_UNEXPECTED;
    }
    // Windows requires recuring events, so we set this to a smaller window
    // than the pref value.
    int timeout = elapse;
    if (timeout > TOUCH_INJECT_PUMP_TIMER_MSEC) {
      timeout = TOUCH_INJECT_PUMP_TIMER_MSEC;
    }
    mLongTapTimer->InitWithFuncCallback(OnLongTapTimerCallback, this,
                                        timeout,
                                        nsITimer::TYPE_REPEATING_SLACK);
  }

  // If we already have a long tap pending, cancel it. We only allow one long
  // tap to be active at a time.
  if (mLongTapTouchPoint) {
    SynthesizeNativeTouchPoint(mLongTapTouchPoint->mPointerId, TOUCH_CANCEL,
                               mLongTapTouchPoint->mPosition, 0, 0, nullptr);
  }

  mLongTapTouchPoint =
    MakeUnique<LongTapInfo>(pointerId, aPoint,
                            TimeDuration::FromMilliseconds(elapse),
                            aObserver);
  notifier.SkipNotification();  // we'll do it in the long-tap callback
  return NS_OK;
}

// static
void
nsIWidget::OnLongTapTimerCallback(nsITimer* aTimer, void* aClosure)
{
  nsIWidget *self = static_cast<nsIWidget *>(aClosure);

  if ((self->mLongTapTouchPoint->mStamp + self->mLongTapTouchPoint->mDuration) >
      TimeStamp::Now()) {
#ifdef XP_WIN
    // Windows needs us to keep pumping feedback to the digitizer, so update
    // the pointer id with the same position.
    self->SynthesizeNativeTouchPoint(self->mLongTapTouchPoint->mPointerId,
                                     TOUCH_CONTACT,
                                     self->mLongTapTouchPoint->mPosition,
                                     1.0, 90, nullptr);
#endif
    return;
  }

  AutoObserverNotifier notifier(self->mLongTapTouchPoint->mObserver, "touchtap");

  // finished, remove the touch point
  self->mLongTapTimer->Cancel();
  self->mLongTapTimer = nullptr;
  self->SynthesizeNativeTouchPoint(self->mLongTapTouchPoint->mPointerId,
                                   TOUCH_REMOVE,
                                   self->mLongTapTouchPoint->mPosition,
                                   0, 0, nullptr);
  self->mLongTapTouchPoint = nullptr;
}

nsresult
nsIWidget::ClearNativeTouchSequence(nsIObserver* aObserver)
{
  AutoObserverNotifier notifier(aObserver, "cleartouch");

  if (!mLongTapTimer) {
    return NS_OK;
  }
  mLongTapTimer->Cancel();
  mLongTapTimer = nullptr;
  SynthesizeNativeTouchPoint(mLongTapTouchPoint->mPointerId, TOUCH_CANCEL,
                             mLongTapTouchPoint->mPosition, 0, 0, nullptr);
  mLongTapTouchPoint = nullptr;
  return NS_OK;
}

void
nsBaseWidget::RegisterPluginWindowForRemoteUpdates()
{
#if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
  NS_NOTREACHED("nsBaseWidget::RegisterPluginWindowForRemoteUpdates not implemented!");
  return;
#else
  MOZ_ASSERT(NS_IsMainThread());
  void* id = GetNativeData(NS_NATIVE_PLUGIN_ID);
  if (!id) {
    NS_WARNING("This is not a valid native widget!");
    return;
  }
  MOZ_ASSERT(sPluginWidgetList);
  sPluginWidgetList->Put(id, this);
#endif
}

void
nsBaseWidget::UnregisterPluginWindowForRemoteUpdates()
{
#if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
  NS_NOTREACHED("nsBaseWidget::UnregisterPluginWindowForRemoteUpdates not implemented!");
  return;
#else
  MOZ_ASSERT(NS_IsMainThread());
  void* id = GetNativeData(NS_NATIVE_PLUGIN_ID);
  if (!id) {
    NS_WARNING("This is not a valid native widget!");
    return;
  }
  MOZ_ASSERT(sPluginWidgetList);
  sPluginWidgetList->Remove(id);
#endif
}

// static
nsIWidget*
nsIWidget::LookupRegisteredPluginWindow(uintptr_t aWindowID)
{
#if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
  NS_NOTREACHED("nsBaseWidget::LookupRegisteredPluginWindow not implemented!");
  return nullptr;
#else
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(sPluginWidgetList);
  return sPluginWidgetList->GetWeak((void*)aWindowID);
#endif
}

// static
void
nsIWidget::UpdateRegisteredPluginWindowVisibility(uintptr_t aOwnerWidget,
                                                  nsTArray<uintptr_t>& aPluginIds)
{
#if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
  NS_NOTREACHED("nsBaseWidget::UpdateRegisteredPluginWindowVisibility not implemented!");
  return;
#else
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(sPluginWidgetList);

  // Our visible list is associated with a compositor which is associated with
  // a specific top level window. We use the parent widget during iteration
  // to skip the plugin widgets owned by other top level windows.
  for (auto iter = sPluginWidgetList->Iter(); !iter.Done(); iter.Next()) {
    const void* windowId = iter.Key();
    nsIWidget* widget = iter.UserData();

    MOZ_ASSERT(windowId);
    MOZ_ASSERT(widget);

    if (!widget->Destroyed()) {
      if ((uintptr_t)widget->GetParent() == aOwnerWidget) {
        widget->Show(aPluginIds.Contains((uintptr_t)windowId));
      }
    }
  }
#endif
}

NS_IMETHODIMP_(nsIWidget::NativeIMEContext)
nsIWidget::GetNativeIMEContext()
{
  return NativeIMEContext(this);
}

nsresult
nsIWidget::OnWindowedPluginKeyEvent(const NativeEventData& aKeyEventData,
                                    nsIKeyEventInPluginCallback* aCallback)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

namespace mozilla {
namespace widget {

const char*
ToChar(IMEMessage aIMEMessage)
{
  switch (aIMEMessage) {
    case NOTIFY_IME_OF_NOTHING:
      return "NOTIFY_IME_OF_NOTHING";
    case NOTIFY_IME_OF_FOCUS:
      return "NOTIFY_IME_OF_FOCUS";
    case NOTIFY_IME_OF_BLUR:
      return "NOTIFY_IME_OF_BLUR";
    case NOTIFY_IME_OF_SELECTION_CHANGE:
      return "NOTIFY_IME_OF_SELECTION_CHANGE";
    case NOTIFY_IME_OF_TEXT_CHANGE:
      return "NOTIFY_IME_OF_TEXT_CHANGE";
    case NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED:
      return "NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED";
    case NOTIFY_IME_OF_POSITION_CHANGE:
      return "NOTIFY_IME_OF_POSITION_CHANGE";
    case NOTIFY_IME_OF_MOUSE_BUTTON_EVENT:
      return "NOTIFY_IME_OF_MOUSE_BUTTON_EVENT";
    case REQUEST_TO_COMMIT_COMPOSITION:
      return "REQUEST_TO_COMMIT_COMPOSITION";
    case REQUEST_TO_CANCEL_COMPOSITION:
      return "REQUEST_TO_CANCEL_COMPOSITION";
    default:
      return "Unexpected value";
  }
}

void
NativeIMEContext::Init(nsIWidget* aWidget)
{
  if (!aWidget) {
    mRawNativeIMEContext = reinterpret_cast<uintptr_t>(nullptr);
    mOriginProcessID = static_cast<uint64_t>(-1);
    return;
  }
  if (!XRE_IsContentProcess()) {
    mRawNativeIMEContext = reinterpret_cast<uintptr_t>(
      aWidget->GetNativeData(NS_RAW_NATIVE_IME_CONTEXT));
    mOriginProcessID = 0;
    return;
  }
  // If this is created in a child process, aWidget is an instance of
  // PuppetWidget which doesn't support NS_RAW_NATIVE_IME_CONTEXT.
  // Instead of that PuppetWidget::GetNativeIMEContext() returns cached
  // native IME context of the parent process.
  *this = aWidget->GetNativeIMEContext();
}

void
NativeIMEContext::InitWithRawNativeIMEContext(void* aRawNativeIMEContext)
{
  if (NS_WARN_IF(!aRawNativeIMEContext)) {
    mRawNativeIMEContext = reinterpret_cast<uintptr_t>(nullptr);
    mOriginProcessID = static_cast<uint64_t>(-1);
    return;
  }
  mRawNativeIMEContext = reinterpret_cast<uintptr_t>(aRawNativeIMEContext);
  mOriginProcessID =
    XRE_IsContentProcess() ? ContentChild::GetSingleton()->GetID() : 0;
}

void
IMENotification::TextChangeDataBase::MergeWith(
                   const IMENotification::TextChangeDataBase& aOther)
{
  MOZ_ASSERT(aOther.IsValid(),
             "Merging data must store valid data");
  MOZ_ASSERT(aOther.mStartOffset <= aOther.mRemovedEndOffset,
             "end of removed text must be same or larger than start");
  MOZ_ASSERT(aOther.mStartOffset <= aOther.mAddedEndOffset,
             "end of added text must be same or larger than start");

  if (!IsValid()) {
    *this = aOther;
    return;
  }

  // |mStartOffset| and |mRemovedEndOffset| represent all replaced or removed
  // text ranges.  I.e., mStartOffset should be the smallest offset of all
  // modified text ranges in old text.  |mRemovedEndOffset| should be the
  // largest end offset in old text of all modified text ranges.
  // |mAddedEndOffset| represents the end offset of all inserted text ranges.
  // I.e., only this is an offset in new text.
  // In other words, between mStartOffset and |mRemovedEndOffset| of the
  // premodified text was already removed.  And some text whose length is
  // |mAddedEndOffset - mStartOffset| is inserted to |mStartOffset|.  I.e.,
  // this allows IME to mark dirty the modified text range with |mStartOffset|
  // and |mRemovedEndOffset| if IME stores all text of the focused editor and
  // to compute new text length with |mAddedEndOffset| and |mRemovedEndOffset|.
  // Additionally, IME can retrieve only the text between |mStartOffset| and
  // |mAddedEndOffset| for updating stored text.

  // For comparing new and old |mStartOffset|/|mRemovedEndOffset| values, they
  // should be adjusted to be in same text. The |newData.mStartOffset| and
  // |newData.mRemovedEndOffset| should be computed as in old text because
  // |mStartOffset| and |mRemovedEndOffset| represent the modified text range
  // in the old text but even if some text before the values of the newData
  // has already been modified, the values don't include the changes.

  // For comparing new and old |mAddedEndOffset| values, they should be
  // adjusted to be in same text.  The |oldData.mAddedEndOffset| should be
  // computed as in the new text because |mAddedEndOffset| indicates the end
  // offset of inserted text in the new text but |oldData.mAddedEndOffset|
  // doesn't include any changes of the text before |newData.mAddedEndOffset|.

  const TextChangeDataBase& newData = aOther;
  const TextChangeDataBase oldData = *this;

  // mCausedOnlyByComposition should be true only when all changes are caused
  // by composition.
  mCausedOnlyByComposition =
    newData.mCausedOnlyByComposition && oldData.mCausedOnlyByComposition;

  // mIncludingChangesWithoutComposition should be true if at least one of
  // merged changes occurred without composition.
  mIncludingChangesWithoutComposition =
    newData.mIncludingChangesWithoutComposition ||
      oldData.mIncludingChangesWithoutComposition;

  // mIncludingChangesDuringComposition should be true when at least one of
  // the merged non-composition changes occurred during the latest composition.
  if (!newData.mCausedOnlyByComposition &&
      !newData.mIncludingChangesDuringComposition) {
    MOZ_ASSERT(newData.mIncludingChangesWithoutComposition);
    MOZ_ASSERT(mIncludingChangesWithoutComposition);
    // If new change is neither caused by composition nor occurred during
    // composition, set mIncludingChangesDuringComposition to false because
    // IME doesn't want outdated text changes as text change during current
    // composition.
    mIncludingChangesDuringComposition = false;
  } else {
    // Otherwise, set mIncludingChangesDuringComposition to true if either
    // oldData or newData includes changes during composition.
    mIncludingChangesDuringComposition =
      newData.mIncludingChangesDuringComposition ||
        oldData.mIncludingChangesDuringComposition;
  }

  if (newData.mStartOffset >= oldData.mAddedEndOffset) {
    // Case 1:
    // If new start is after old end offset of added text, it means that text
    // after the modified range is modified.  Like:
    // added range of old change:             +----------+
    // removed range of new change:                           +----------+
    // So, the old start offset is always the smaller offset.
    mStartOffset = oldData.mStartOffset;
    // The new end offset of removed text is moved by the old change and we
    // need to cancel the move of the old change for comparing the offsets in
    // same text because it doesn't make sensce to compare offsets in different
    // text.
    uint32_t newRemovedEndOffsetInOldText =
      newData.mRemovedEndOffset - oldData.Difference();
    mRemovedEndOffset =
      std::max(newRemovedEndOffsetInOldText, oldData.mRemovedEndOffset);
    // The new end offset of added text is always the larger offset.
    mAddedEndOffset = newData.mAddedEndOffset;
    return;
  }

  if (newData.mStartOffset >= oldData.mStartOffset) {
    // If new start is in the modified range, it means that new data changes
    // a part or all of the range.
    mStartOffset = oldData.mStartOffset;
    if (newData.mRemovedEndOffset >= oldData.mAddedEndOffset) {
      // Case 2:
      // If new end of removed text is greater than old end of added text, it
      // means that all or a part of modified range modified again and text
      // after the modified range is also modified.  Like:
      // added range of old change:             +----------+
      // removed range of new change:                   +----------+
      // So, the new removed end offset is moved by the old change and we need
      // to cancel the move of the old change for comparing the offsets in the
      // same text because it doesn't make sense to compare the offsets in
      // different text.
      uint32_t newRemovedEndOffsetInOldText =
        newData.mRemovedEndOffset - oldData.Difference();
      mRemovedEndOffset =
        std::max(newRemovedEndOffsetInOldText, oldData.mRemovedEndOffset);
      // The old end of added text is replaced by new change. So, it should be
      // same as the new start.  On the other hand, the new added end offset is
      // always same or larger.  Therefore, the merged end offset of added
      // text should be the new end offset of added text.
      mAddedEndOffset = newData.mAddedEndOffset;
      return;
    }

    // Case 3:
    // If new end of removed text is less than old end of added text, it means
    // that only a part of the modified range is modified again.  Like:
    // added range of old change:             +------------+
    // removed range of new change:               +-----+
    // So, the new end offset of removed text should be same as the old end
    // offset of removed text.  Therefore, the merged end offset of removed
    // text should be the old text change's |mRemovedEndOffset|.
    mRemovedEndOffset = oldData.mRemovedEndOffset;
    // The old end of added text is moved by new change.  So, we need to cancel
    // the move of the new change for comparing the offsets in same text.
    uint32_t oldAddedEndOffsetInNewText =
      oldData.mAddedEndOffset + newData.Difference();
    mAddedEndOffset =
      std::max(newData.mAddedEndOffset, oldAddedEndOffsetInNewText);
    return;
  }

  if (newData.mRemovedEndOffset >= oldData.mStartOffset) {
    // If new end of removed text is greater than old start (and new start is
    // less than old start), it means that a part of modified range is modified
    // again and some new text before the modified range is also modified.
    MOZ_ASSERT(newData.mStartOffset < oldData.mStartOffset,
      "new start offset should be less than old one here");
    mStartOffset = newData.mStartOffset;
    if (newData.mRemovedEndOffset >= oldData.mAddedEndOffset) {
      // Case 4:
      // If new end of removed text is greater than old end of added text, it
      // means that all modified text and text after the modified range is
      // modified.  Like:
      // added range of old change:             +----------+
      // removed range of new change:        +------------------+
      // So, the new end of removed text is moved by the old change.  Therefore,
      // we need to cancel the move of the old change for comparing the offsets
      // in same text because it doesn't make sense to compare the offsets in
      // different text.
      uint32_t newRemovedEndOffsetInOldText =
        newData.mRemovedEndOffset - oldData.Difference();
      mRemovedEndOffset =
        std::max(newRemovedEndOffsetInOldText, oldData.mRemovedEndOffset);
      // The old end of added text is replaced by new change.  So, the old end
      // offset of added text is same as new text change's start offset.  Then,
      // new change's end offset of added text is always same or larger than
      // it.  Therefore, merged end offset of added text is always the new end
      // offset of added text.
      mAddedEndOffset = newData.mAddedEndOffset;
      return;
    }

    // Case 5:
    // If new end of removed text is less than old end of added text, it
    // means that only a part of the modified range is modified again.  Like:
    // added range of old change:             +----------+
    // removed range of new change:      +----------+
    // So, the new end of removed text should be same as old end of removed
    // text for preventing end of removed text to be modified.  Therefore,
    // merged end offset of removed text is always the old end offset of removed
    // text.
    mRemovedEndOffset = oldData.mRemovedEndOffset;
    // The old end of added text is moved by this change.  So, we need to
    // cancel the move of the new change for comparing the offsets in same text
    // because it doesn't make sense to compare the offsets in different text.
    uint32_t oldAddedEndOffsetInNewText =
      oldData.mAddedEndOffset + newData.Difference();
    mAddedEndOffset =
      std::max(newData.mAddedEndOffset, oldAddedEndOffsetInNewText);
    return;
  }

  // Case 6:
  // Otherwise, i.e., both new end of added text and new start are less than
  // old start, text before the modified range is modified.  Like:
  // added range of old change:                  +----------+
  // removed range of new change: +----------+
  MOZ_ASSERT(newData.mStartOffset < oldData.mStartOffset,
    "new start offset should be less than old one here");
  mStartOffset = newData.mStartOffset;
  MOZ_ASSERT(newData.mRemovedEndOffset < oldData.mRemovedEndOffset,
     "new removed end offset should be less than old one here");
  mRemovedEndOffset = oldData.mRemovedEndOffset;
  // The end of added text should be adjusted with the new difference.
  uint32_t oldAddedEndOffsetInNewText =
    oldData.mAddedEndOffset + newData.Difference();
  mAddedEndOffset =
    std::max(newData.mAddedEndOffset, oldAddedEndOffsetInNewText);
}

#ifdef DEBUG

// Let's test the code of merging multiple text change data in debug build
// and crash if one of them fails because this feature is very complex but
// cannot be tested with mochitest.
void
IMENotification::TextChangeDataBase::Test()
{
  static bool gTestTextChangeEvent = true;
  if (!gTestTextChangeEvent) {
    return;
  }
  gTestTextChangeEvent = false;

  /****************************************************************************
   * Case 1
   ****************************************************************************/

  // Appending text
  MergeWith(TextChangeData(10, 10, 20, false, false));
  MergeWith(TextChangeData(20, 20, 35, false, false));
  MOZ_ASSERT(mStartOffset == 10,
    "Test 1-1-1: mStartOffset should be the first offset");
  MOZ_ASSERT(mRemovedEndOffset == 10, // 20 - (20 - 10)
    "Test 1-1-2: mRemovedEndOffset should be the first end of removed text");
  MOZ_ASSERT(mAddedEndOffset == 35,
    "Test 1-1-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Removing text (longer line -> shorter line)
  MergeWith(TextChangeData(10, 20, 10, false, false));
  MergeWith(TextChangeData(10, 30, 10, false, false));
  MOZ_ASSERT(mStartOffset == 10,
    "Test 1-2-1: mStartOffset should be the first offset");
  MOZ_ASSERT(mRemovedEndOffset == 40, // 30 + (10 - 20)
    "Test 1-2-2: mRemovedEndOffset should be the the last end of removed text "
    "with already removed length");
  MOZ_ASSERT(mAddedEndOffset == 10,
    "Test 1-2-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Removing text (shorter line -> longer line)
  MergeWith(TextChangeData(10, 20, 10, false, false));
  MergeWith(TextChangeData(10, 15, 10, false, false));
  MOZ_ASSERT(mStartOffset == 10,
    "Test 1-3-1: mStartOffset should be the first offset");
  MOZ_ASSERT(mRemovedEndOffset == 25, // 15 + (10 - 20)
    "Test 1-3-2: mRemovedEndOffset should be the the last end of removed text "
    "with already removed length");
  MOZ_ASSERT(mAddedEndOffset == 10,
    "Test 1-3-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Appending text at different point (not sure if actually occurs)
  MergeWith(TextChangeData(10, 10, 20, false, false));
  MergeWith(TextChangeData(55, 55, 60, false, false));
  MOZ_ASSERT(mStartOffset == 10,
    "Test 1-4-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 45, // 55 - (10 - 20)
    "Test 1-4-2: mRemovedEndOffset should be the the largest end of removed "
    "text without already added length");
  MOZ_ASSERT(mAddedEndOffset == 60,
    "Test 1-4-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Removing text at different point (not sure if actually occurs)
  MergeWith(TextChangeData(10, 20, 10, false, false));
  MergeWith(TextChangeData(55, 68, 55, false, false));
  MOZ_ASSERT(mStartOffset == 10,
    "Test 1-5-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 78, // 68 - (10 - 20)
    "Test 1-5-2: mRemovedEndOffset should be the the largest end of removed "
    "text with already removed length");
  MOZ_ASSERT(mAddedEndOffset == 55,
    "Test 1-5-3: mAddedEndOffset should be the largest end of added text");
  Clear();

  // Replacing text and append text (becomes longer)
  MergeWith(TextChangeData(30, 35, 32, false, false));
  MergeWith(TextChangeData(32, 32, 40, false, false));
  MOZ_ASSERT(mStartOffset == 30,
    "Test 1-6-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 35, // 32 - (32 - 35)
    "Test 1-6-2: mRemovedEndOffset should be the the first end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 40,
    "Test 1-6-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Replacing text and append text (becomes shorter)
  MergeWith(TextChangeData(30, 35, 32, false, false));
  MergeWith(TextChangeData(32, 32, 33, false, false));
  MOZ_ASSERT(mStartOffset == 30,
    "Test 1-7-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 35, // 32 - (32 - 35)
    "Test 1-7-2: mRemovedEndOffset should be the the first end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 33,
    "Test 1-7-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Removing text and replacing text after first range (not sure if actually
  // occurs)
  MergeWith(TextChangeData(30, 35, 30, false, false));
  MergeWith(TextChangeData(32, 34, 48, false, false));
  MOZ_ASSERT(mStartOffset == 30,
    "Test 1-8-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 39, // 34 - (30 - 35)
    "Test 1-8-2: mRemovedEndOffset should be the the first end of removed text "
    "without already removed text");
  MOZ_ASSERT(mAddedEndOffset == 48,
    "Test 1-8-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Removing text and replacing text after first range (not sure if actually
  // occurs)
  MergeWith(TextChangeData(30, 35, 30, false, false));
  MergeWith(TextChangeData(32, 38, 36, false, false));
  MOZ_ASSERT(mStartOffset == 30,
    "Test 1-9-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 43, // 38 - (30 - 35)
    "Test 1-9-2: mRemovedEndOffset should be the the first end of removed text "
    "without already removed text");
  MOZ_ASSERT(mAddedEndOffset == 36,
    "Test 1-9-3: mAddedEndOffset should be the last end of added text");
  Clear();

  /****************************************************************************
   * Case 2
   ****************************************************************************/

  // Replacing text in around end of added text (becomes shorter) (not sure
  // if actually occurs)
  MergeWith(TextChangeData(50, 50, 55, false, false));
  MergeWith(TextChangeData(53, 60, 54, false, false));
  MOZ_ASSERT(mStartOffset == 50,
    "Test 2-1-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 55, // 60 - (55 - 50)
    "Test 2-1-2: mRemovedEndOffset should be the the last end of removed text "
    "without already added text length");
  MOZ_ASSERT(mAddedEndOffset == 54,
    "Test 2-1-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Replacing text around end of added text (becomes longer) (not sure
  // if actually occurs)
  MergeWith(TextChangeData(50, 50, 55, false, false));
  MergeWith(TextChangeData(54, 62, 68, false, false));
  MOZ_ASSERT(mStartOffset == 50,
    "Test 2-2-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 57, // 62 - (55 - 50)
    "Test 2-2-2: mRemovedEndOffset should be the the last end of removed text "
    "without already added text length");
  MOZ_ASSERT(mAddedEndOffset == 68,
    "Test 2-2-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Replacing text around end of replaced text (became shorter) (not sure if
  // actually occurs)
  MergeWith(TextChangeData(36, 48, 45, false, false));
  MergeWith(TextChangeData(43, 50, 49, false, false));
  MOZ_ASSERT(mStartOffset == 36,
    "Test 2-3-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 53, // 50 - (45 - 48)
    "Test 2-3-2: mRemovedEndOffset should be the the last end of removed text "
    "without already removed text length");
  MOZ_ASSERT(mAddedEndOffset == 49,
    "Test 2-3-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Replacing text around end of replaced text (became longer) (not sure if
  // actually occurs)
  MergeWith(TextChangeData(36, 52, 53, false, false));
  MergeWith(TextChangeData(43, 68, 61, false, false));
  MOZ_ASSERT(mStartOffset == 36,
    "Test 2-4-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 67, // 68 - (53 - 52)
    "Test 2-4-2: mRemovedEndOffset should be the the last end of removed text "
    "without already added text length");
  MOZ_ASSERT(mAddedEndOffset == 61,
    "Test 2-4-3: mAddedEndOffset should be the last end of added text");
  Clear();

  /****************************************************************************
   * Case 3
   ****************************************************************************/

  // Appending text in already added text (not sure if actually occurs)
  MergeWith(TextChangeData(10, 10, 20, false, false));
  MergeWith(TextChangeData(15, 15, 30, false, false));
  MOZ_ASSERT(mStartOffset == 10,
    "Test 3-1-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 10,
    "Test 3-1-2: mRemovedEndOffset should be the the first end of removed text");
  MOZ_ASSERT(mAddedEndOffset == 35, // 20 + (30 - 15)
    "Test 3-1-3: mAddedEndOffset should be the first end of added text with "
    "added text length by the new change");
  Clear();

  // Replacing text in added text (not sure if actually occurs)
  MergeWith(TextChangeData(50, 50, 55, false, false));
  MergeWith(TextChangeData(52, 53, 56, false, false));
  MOZ_ASSERT(mStartOffset == 50,
    "Test 3-2-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 50,
    "Test 3-2-2: mRemovedEndOffset should be the the first end of removed text");
  MOZ_ASSERT(mAddedEndOffset == 58, // 55 + (56 - 53)
    "Test 3-2-3: mAddedEndOffset should be the first end of added text with "
    "added text length by the new change");
  Clear();

  // Replacing text in replaced text (became shorter) (not sure if actually
  // occurs)
  MergeWith(TextChangeData(36, 48, 45, false, false));
  MergeWith(TextChangeData(37, 38, 50, false, false));
  MOZ_ASSERT(mStartOffset == 36,
    "Test 3-3-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 48,
    "Test 3-3-2: mRemovedEndOffset should be the the first end of removed text");
  MOZ_ASSERT(mAddedEndOffset == 57, // 45 + (50 - 38)
    "Test 3-3-3: mAddedEndOffset should be the first end of added text with "
    "added text length by the new change");
  Clear();

  // Replacing text in replaced text (became longer) (not sure if actually
  // occurs)
  MergeWith(TextChangeData(32, 48, 53, false, false));
  MergeWith(TextChangeData(43, 50, 52, false, false));
  MOZ_ASSERT(mStartOffset == 32,
    "Test 3-4-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 48,
    "Test 3-4-2: mRemovedEndOffset should be the the last end of removed text "
    "without already added text length");
  MOZ_ASSERT(mAddedEndOffset == 55, // 53 + (52 - 50)
    "Test 3-4-3: mAddedEndOffset should be the first end of added text with "
    "added text length by the new change");
  Clear();

  // Replacing text in replaced text (became shorter) (not sure if actually
  // occurs)
  MergeWith(TextChangeData(36, 48, 50, false, false));
  MergeWith(TextChangeData(37, 49, 47, false, false));
  MOZ_ASSERT(mStartOffset == 36,
    "Test 3-5-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 48,
    "Test 3-5-2: mRemovedEndOffset should be the the first end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 48, // 50 + (47 - 49)
    "Test 3-5-3: mAddedEndOffset should be the first end of added text without "
    "removed text length by the new change");
  Clear();

  // Replacing text in replaced text (became longer) (not sure if actually
  // occurs)
  MergeWith(TextChangeData(32, 48, 53, false, false));
  MergeWith(TextChangeData(43, 50, 47, false, false));
  MOZ_ASSERT(mStartOffset == 32,
    "Test 3-6-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 48,
    "Test 3-6-2: mRemovedEndOffset should be the the last end of removed text "
    "without already added text length");
  MOZ_ASSERT(mAddedEndOffset == 50, // 53 + (47 - 50)
    "Test 3-6-3: mAddedEndOffset should be the first end of added text without "
    "removed text length by the new change");
  Clear();

  /****************************************************************************
   * Case 4
   ****************************************************************************/

  // Replacing text all of already append text (not sure if actually occurs)
  MergeWith(TextChangeData(50, 50, 55, false, false));
  MergeWith(TextChangeData(44, 66, 68, false, false));
  MOZ_ASSERT(mStartOffset == 44,
    "Test 4-1-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 61, // 66 - (55 - 50)
    "Test 4-1-2: mRemovedEndOffset should be the the last end of removed text "
    "without already added text length");
  MOZ_ASSERT(mAddedEndOffset == 68,
    "Test 4-1-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Replacing text around a point in which text was removed (not sure if
  // actually occurs)
  MergeWith(TextChangeData(50, 62, 50, false, false));
  MergeWith(TextChangeData(44, 66, 68, false, false));
  MOZ_ASSERT(mStartOffset == 44,
    "Test 4-2-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 78, // 66 - (50 - 62)
    "Test 4-2-2: mRemovedEndOffset should be the the last end of removed text "
    "without already removed text length");
  MOZ_ASSERT(mAddedEndOffset == 68,
    "Test 4-2-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Replacing text all replaced text (became shorter) (not sure if actually
  // occurs)
  MergeWith(TextChangeData(50, 62, 60, false, false));
  MergeWith(TextChangeData(49, 128, 130, false, false));
  MOZ_ASSERT(mStartOffset == 49,
    "Test 4-3-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 130, // 128 - (60 - 62)
    "Test 4-3-2: mRemovedEndOffset should be the the last end of removed text "
    "without already removed text length");
  MOZ_ASSERT(mAddedEndOffset == 130,
    "Test 4-3-3: mAddedEndOffset should be the last end of added text");
  Clear();

  // Replacing text all replaced text (became longer) (not sure if actually
  // occurs)
  MergeWith(TextChangeData(50, 61, 73, false, false));
  MergeWith(TextChangeData(44, 100, 50, false, false));
  MOZ_ASSERT(mStartOffset == 44,
    "Test 4-4-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 88, // 100 - (73 - 61)
    "Test 4-4-2: mRemovedEndOffset should be the the last end of removed text "
    "with already added text length");
  MOZ_ASSERT(mAddedEndOffset == 50,
    "Test 4-4-3: mAddedEndOffset should be the last end of added text");
  Clear();

  /****************************************************************************
   * Case 5
   ****************************************************************************/

  // Replacing text around start of added text (not sure if actually occurs)
  MergeWith(TextChangeData(50, 50, 55, false, false));
  MergeWith(TextChangeData(48, 52, 49, false, false));
  MOZ_ASSERT(mStartOffset == 48,
    "Test 5-1-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 50,
    "Test 5-1-2: mRemovedEndOffset should be the the first end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 52, // 55 + (52 - 49)
    "Test 5-1-3: mAddedEndOffset should be the first end of added text with "
    "added text length by the new change");
  Clear();

  // Replacing text around start of replaced text (became shorter) (not sure if
  // actually occurs)
  MergeWith(TextChangeData(50, 60, 58, false, false));
  MergeWith(TextChangeData(43, 50, 48, false, false));
  MOZ_ASSERT(mStartOffset == 43,
    "Test 5-2-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 60,
    "Test 5-2-2: mRemovedEndOffset should be the the first end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 56, // 58 + (48 - 50)
    "Test 5-2-3: mAddedEndOffset should be the first end of added text without "
    "removed text length by the new change");
  Clear();

  // Replacing text around start of replaced text (became longer) (not sure if
  // actually occurs)
  MergeWith(TextChangeData(50, 60, 68, false, false));
  MergeWith(TextChangeData(43, 55, 53, false, false));
  MOZ_ASSERT(mStartOffset == 43,
    "Test 5-3-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 60,
    "Test 5-3-2: mRemovedEndOffset should be the the first end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 66, // 68 + (53 - 55)
    "Test 5-3-3: mAddedEndOffset should be the first end of added text without "
    "removed text length by the new change");
  Clear();

  // Replacing text around start of replaced text (became shorter) (not sure if
  // actually occurs)
  MergeWith(TextChangeData(50, 60, 58, false, false));
  MergeWith(TextChangeData(43, 50, 128, false, false));
  MOZ_ASSERT(mStartOffset == 43,
    "Test 5-4-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 60,
    "Test 5-4-2: mRemovedEndOffset should be the the first end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 136, // 58 + (128 - 50)
    "Test 5-4-3: mAddedEndOffset should be the first end of added text with "
    "added text length by the new change");
  Clear();

  // Replacing text around start of replaced text (became longer) (not sure if
  // actually occurs)
  MergeWith(TextChangeData(50, 60, 68, false, false));
  MergeWith(TextChangeData(43, 55, 65, false, false));
  MOZ_ASSERT(mStartOffset == 43,
    "Test 5-5-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 60,
    "Test 5-5-2: mRemovedEndOffset should be the the first end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 78, // 68 + (65 - 55)
    "Test 5-5-3: mAddedEndOffset should be the first end of added text with "
    "added text length by the new change");
  Clear();

  /****************************************************************************
   * Case 6
   ****************************************************************************/

  // Appending text before already added text (not sure if actually occurs)
  MergeWith(TextChangeData(30, 30, 45, false, false));
  MergeWith(TextChangeData(10, 10, 20, false, false));
  MOZ_ASSERT(mStartOffset == 10,
    "Test 6-1-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 30,
    "Test 6-1-2: mRemovedEndOffset should be the the largest end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 55, // 45 + (20 - 10)
    "Test 6-1-3: mAddedEndOffset should be the first end of added text with "
    "added text length by the new change");
  Clear();

  // Removing text before already removed text (not sure if actually occurs)
  MergeWith(TextChangeData(30, 35, 30, false, false));
  MergeWith(TextChangeData(10, 25, 10, false, false));
  MOZ_ASSERT(mStartOffset == 10,
    "Test 6-2-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 35,
    "Test 6-2-2: mRemovedEndOffset should be the the largest end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 15, // 30 - (25 - 10)
    "Test 6-2-3: mAddedEndOffset should be the first end of added text with "
    "removed text length by the new change");
  Clear();

  // Replacing text before already replaced text (not sure if actually occurs)
  MergeWith(TextChangeData(50, 65, 70, false, false));
  MergeWith(TextChangeData(13, 24, 15, false, false));
  MOZ_ASSERT(mStartOffset == 13,
    "Test 6-3-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 65,
    "Test 6-3-2: mRemovedEndOffset should be the the largest end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 61, // 70 + (15 - 24)
    "Test 6-3-3: mAddedEndOffset should be the first end of added text without "
    "removed text length by the new change");
  Clear();

  // Replacing text before already replaced text (not sure if actually occurs)
  MergeWith(TextChangeData(50, 65, 70, false, false));
  MergeWith(TextChangeData(13, 24, 36, false, false));
  MOZ_ASSERT(mStartOffset == 13,
    "Test 6-4-1: mStartOffset should be the smallest offset");
  MOZ_ASSERT(mRemovedEndOffset == 65,
    "Test 6-4-2: mRemovedEndOffset should be the the largest end of removed "
    "text");
  MOZ_ASSERT(mAddedEndOffset == 82, // 70 + (36 - 24)
    "Test 6-4-3: mAddedEndOffset should be the first end of added text without "
    "removed text length by the new change");
  Clear();
}

#endif // #ifdef DEBUG

} // namespace widget
} // namespace mozilla

#ifdef DEBUG
//////////////////////////////////////////////////////////////
//
// Convert a GUI event message code to a string.
// Makes it a lot easier to debug events.
//
// See gtk/nsWidget.cpp and windows/nsWindow.cpp
// for a DebugPrintEvent() function that uses
// this.
//
//////////////////////////////////////////////////////////////
/* static */ nsAutoString
nsBaseWidget::debug_GuiEventToString(WidgetGUIEvent* aGuiEvent)
{
  NS_ASSERTION(nullptr != aGuiEvent,"cmon, null gui event.");

  nsAutoString eventName(NS_LITERAL_STRING("UNKNOWN"));

#define _ASSIGN_eventName(_value,_name)\
case _value: eventName.AssignLiteral(_name) ; break

  switch(aGuiEvent->mMessage)
  {
    _ASSIGN_eventName(eBlur,"eBlur");
    _ASSIGN_eventName(eLegacyDragGesture,"eLegacyDragGesture");
    _ASSIGN_eventName(eDrop,"eDrop");
    _ASSIGN_eventName(eDragEnter,"eDragEnter");
    _ASSIGN_eventName(eDragExit,"eDragExit");
    _ASSIGN_eventName(eDragOver,"eDragOver");
    _ASSIGN_eventName(eEditorInput,"eEditorInput");
    _ASSIGN_eventName(eFocus,"eFocus");
    _ASSIGN_eventName(eFormSelect,"eFormSelect");
    _ASSIGN_eventName(eFormChange,"eFormChange");
    _ASSIGN_eventName(eFormReset,"eFormReset");
    _ASSIGN_eventName(eFormSubmit,"eFormSubmit");
    _ASSIGN_eventName(eImageAbort,"eImageAbort");
    _ASSIGN_eventName(eLoadError,"eLoadError");
    _ASSIGN_eventName(eKeyDown,"eKeyDown");
    _ASSIGN_eventName(eKeyPress,"eKeyPress");
    _ASSIGN_eventName(eKeyUp,"eKeyUp");
    _ASSIGN_eventName(eMouseEnterIntoWidget,"eMouseEnterIntoWidget");
    _ASSIGN_eventName(eMouseExitFromWidget,"eMouseExitFromWidget");
    _ASSIGN_eventName(eMouseDown,"eMouseDown");
    _ASSIGN_eventName(eMouseUp,"eMouseUp");
    _ASSIGN_eventName(eMouseClick,"eMouseClick");
    _ASSIGN_eventName(eMouseDoubleClick,"eMouseDoubleClick");
    _ASSIGN_eventName(eMouseMove,"eMouseMove");
    _ASSIGN_eventName(eLoad,"eLoad");
    _ASSIGN_eventName(ePopState,"ePopState");
    _ASSIGN_eventName(eBeforeScriptExecute,"eBeforeScriptExecute");
    _ASSIGN_eventName(eAfterScriptExecute,"eAfterScriptExecute");
    _ASSIGN_eventName(eUnload,"eUnload");
    _ASSIGN_eventName(eHashChange,"eHashChange");
    _ASSIGN_eventName(eReadyStateChange,"eReadyStateChange");
    _ASSIGN_eventName(eXULBroadcast, "eXULBroadcast");
    _ASSIGN_eventName(eXULCommandUpdate, "eXULCommandUpdate");

#undef _ASSIGN_eventName

  default:
    {
      char buf[32];

      snprintf_literal(buf,"UNKNOWN: %d",aGuiEvent->mMessage);

      CopyASCIItoUTF16(buf, eventName);
    }
    break;
  }

  return nsAutoString(eventName);
}
//////////////////////////////////////////////////////////////
//
// Code to deal with paint and event debug prefs.
//
//////////////////////////////////////////////////////////////
struct PrefPair
{
  const char * name;
  bool value;
};

static PrefPair debug_PrefValues[] =
{
  { "nglayout.debug.crossing_event_dumping", false },
  { "nglayout.debug.event_dumping", false },
  { "nglayout.debug.invalidate_dumping", false },
  { "nglayout.debug.motion_event_dumping", false },
  { "nglayout.debug.paint_dumping", false },
  { "nglayout.debug.paint_flashing", false }
};

//////////////////////////////////////////////////////////////
bool
nsBaseWidget::debug_GetCachedBoolPref(const char * aPrefName)
{
  NS_ASSERTION(nullptr != aPrefName,"cmon, pref name is null.");

  for (uint32_t i = 0; i < ArrayLength(debug_PrefValues); i++)
  {
    if (strcmp(debug_PrefValues[i].name, aPrefName) == 0)
    {
      return debug_PrefValues[i].value;
    }
  }

  return false;
}
//////////////////////////////////////////////////////////////
static void debug_SetCachedBoolPref(const char * aPrefName,bool aValue)
{
  NS_ASSERTION(nullptr != aPrefName,"cmon, pref name is null.");

  for (uint32_t i = 0; i < ArrayLength(debug_PrefValues); i++)
  {
    if (strcmp(debug_PrefValues[i].name, aPrefName) == 0)
    {
      debug_PrefValues[i].value = aValue;

      return;
    }
  }

  NS_ASSERTION(false, "cmon, this code is not reached dude.");
}

//////////////////////////////////////////////////////////////
class Debug_PrefObserver final : public nsIObserver {
    ~Debug_PrefObserver() {}

  public:
    NS_DECL_ISUPPORTS
    NS_DECL_NSIOBSERVER
};

NS_IMPL_ISUPPORTS(Debug_PrefObserver, nsIObserver)

NS_IMETHODIMP
Debug_PrefObserver::Observe(nsISupports* subject, const char* topic,
                            const char16_t* data)
{
  NS_ConvertUTF16toUTF8 prefName(data);

  bool value = Preferences::GetBool(prefName.get(), false);
  debug_SetCachedBoolPref(prefName.get(), value);
  return NS_OK;
}

//////////////////////////////////////////////////////////////
/* static */ void
debug_RegisterPrefCallbacks()
{
  static bool once = true;

  if (!once) {
    return;
  }

  once = false;

  nsCOMPtr<nsIObserver> obs(new Debug_PrefObserver());
  for (uint32_t i = 0; i < ArrayLength(debug_PrefValues); i++) {
    // Initialize the pref values
    debug_PrefValues[i].value =
      Preferences::GetBool(debug_PrefValues[i].name, false);

    if (obs) {
      // Register callbacks for when these change
      Preferences::AddStrongObserver(obs, debug_PrefValues[i].name);
    }
  }
}
//////////////////////////////////////////////////////////////
static int32_t
_GetPrintCount()
{
  static int32_t sCount = 0;

  return ++sCount;
}
//////////////////////////////////////////////////////////////
/* static */ bool
nsBaseWidget::debug_WantPaintFlashing()
{
  return debug_GetCachedBoolPref("nglayout.debug.paint_flashing");
}
//////////////////////////////////////////////////////////////
/* static */ void
nsBaseWidget::debug_DumpEvent(FILE *                aFileOut,
                              nsIWidget *           aWidget,
                              WidgetGUIEvent*       aGuiEvent,
                              const char*           aWidgetName,
                              int32_t               aWindowID)
{
  if (aGuiEvent->mMessage == eMouseMove) {
    if (!debug_GetCachedBoolPref("nglayout.debug.motion_event_dumping"))
      return;
  }

  if (aGuiEvent->mMessage == eMouseEnterIntoWidget ||
      aGuiEvent->mMessage == eMouseExitFromWidget) {
    if (!debug_GetCachedBoolPref("nglayout.debug.crossing_event_dumping"))
      return;
  }

  if (!debug_GetCachedBoolPref("nglayout.debug.event_dumping"))
    return;

  NS_LossyConvertUTF16toASCII tempString(debug_GuiEventToString(aGuiEvent).get());

  fprintf(aFileOut,
          "%4d %-26s widget=%-8p name=%-12s id=0x%-6x refpt=%d,%d\n",
          _GetPrintCount(),
          tempString.get(),
          (void *) aWidget,
          aWidgetName,
          aWindowID,
          aGuiEvent->mRefPoint.x,
          aGuiEvent->mRefPoint.y);
}
//////////////////////////////////////////////////////////////
/* static */ void
nsBaseWidget::debug_DumpPaintEvent(FILE *                aFileOut,
                                   nsIWidget *           aWidget,
                                   const nsIntRegion &   aRegion,
                                   const char *          aWidgetName,
                                   int32_t               aWindowID)
{
  NS_ASSERTION(nullptr != aFileOut,"cmon, null output FILE");
  NS_ASSERTION(nullptr != aWidget,"cmon, the widget is null");

  if (!debug_GetCachedBoolPref("nglayout.debug.paint_dumping"))
    return;

  nsIntRect rect = aRegion.GetBounds();
  fprintf(aFileOut,
          "%4d PAINT      widget=%p name=%-12s id=0x%-6x bounds-rect=%3d,%-3d %3d,%-3d",
          _GetPrintCount(),
          (void *) aWidget,
          aWidgetName,
          aWindowID,
          rect.x, rect.y, rect.width, rect.height
    );

  fprintf(aFileOut,"\n");
}
//////////////////////////////////////////////////////////////
/* static */ void
nsBaseWidget::debug_DumpInvalidate(FILE* aFileOut,
                                   nsIWidget* aWidget,
                                   const LayoutDeviceIntRect* aRect,
                                   const char* aWidgetName,
                                   int32_t aWindowID)
{
  if (!debug_GetCachedBoolPref("nglayout.debug.invalidate_dumping"))
    return;

  NS_ASSERTION(nullptr != aFileOut,"cmon, null output FILE");
  NS_ASSERTION(nullptr != aWidget,"cmon, the widget is null");

  fprintf(aFileOut,
          "%4d Invalidate widget=%p name=%-12s id=0x%-6x",
          _GetPrintCount(),
          (void *) aWidget,
          aWidgetName,
          aWindowID);

  if (aRect) {
    fprintf(aFileOut,
            " rect=%3d,%-3d %3d,%-3d",
            aRect->x, aRect->y, aRect->width, aRect->height);
  } else {
    fprintf(aFileOut,
            " rect=%-15s",
            "none");
  }

  fprintf(aFileOut, "\n");
}
//////////////////////////////////////////////////////////////

#endif // DEBUG