widget/PuppetWidget.h
author Valentin Gosu <valentin.gosu@gmail.com>
Fri, 02 Nov 2018 17:38:37 -0400
changeset 501038 8016d0d1a391f1327a0375fb6d4f20228b2784aa
parent 492584 b84a0e018ea893cef8c43fdcf8577870bc1e5bcd
child 503511 ad0782d7c503f33cfb554d08dedc96287e1ed3f2
permissions -rw-r--r--
Bug 1503725 - Do not deallocate nsThreadShutdownContext when leaking thread. r=erahm, a=RyanVM Sometimes when we call ShutdownWithTimeout on a thread pool, the unresponsive thread that we leak will actually complete before the main thread is done. In that case, the thread will dereference the thread shutdown context, so we must intentionally leak it too. Differential Revision: https://phabricator.services.mozilla.com/D10645

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=8 et :
 */
/* 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/. */

/**
 * This "puppet widget" isn't really a platform widget.  It's intended
 * to be used in widgetless rendering contexts, such as sandboxed
 * content processes.  If any "real" widgetry is needed, the request
 * is forwarded to and/or data received from elsewhere.
 */

#ifndef mozilla_widget_PuppetWidget_h__
#define mozilla_widget_PuppetWidget_h__

#include "mozilla/gfx/2D.h"
#include "mozilla/RefPtr.h"
#include "nsBaseScreen.h"
#include "nsBaseWidget.h"
#include "nsCOMArray.h"
#include "nsIKeyEventInPluginCallback.h"
#include "nsIScreenManager.h"
#include "nsThreadUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/ContentCache.h"
#include "mozilla/EventForwards.h"
#include "mozilla/TextEventDispatcherListener.h"
#include "mozilla/layers/MemoryPressureObserver.h"

namespace mozilla {

namespace dom {
class TabChild;
} // namespace dom

namespace widget {

struct AutoCacheNativeKeyCommands;

class PuppetWidget : public nsBaseWidget
                   , public TextEventDispatcherListener
                   , public layers::MemoryPressureListener
{
  typedef mozilla::CSSRect CSSRect;
  typedef mozilla::dom::TabChild TabChild;
  typedef mozilla::gfx::DrawTarget DrawTarget;

  // Avoiding to make compiler confused between mozilla::widget and nsIWidget.
  typedef mozilla::widget::TextEventDispatcher TextEventDispatcher;
  typedef mozilla::widget::TextEventDispatcherListener
                             TextEventDispatcherListener;

  typedef nsBaseWidget Base;

  // The width and height of the "widget" are clamped to this.
  static const size_t kMaxDimension;

public:
  explicit PuppetWidget(TabChild* aTabChild);

protected:
  virtual ~PuppetWidget();

public:
  NS_DECL_ISUPPORTS_INHERITED

  // PuppetWidget creation is infallible, hence InfallibleCreate(), which
  // Create() calls.
  using nsBaseWidget::Create; // for Create signature not overridden here
  virtual nsresult Create(nsIWidget* aParent,
                          nsNativeWidget aNativeParent,
                          const LayoutDeviceIntRect& aRect,
                          nsWidgetInitData* aInitData = nullptr)
                          override;
  void InfallibleCreate(nsIWidget* aParent,
                        nsNativeWidget aNativeParent,
                        const LayoutDeviceIntRect& aRect,
                        nsWidgetInitData* aInitData = nullptr);

  void InitIMEState();

  virtual already_AddRefed<nsIWidget>
  CreateChild(const LayoutDeviceIntRect& aRect,
              nsWidgetInitData* aInitData = nullptr,
              bool aForceUseIWidgetParent = false) override;

  virtual void Destroy() override;

  virtual void Show(bool aState) override;

  virtual bool IsVisible() const override
  { return mVisible; }

  virtual void ConstrainPosition(bool     /*ignored aAllowSlop*/,
                                 int32_t* aX,
                                 int32_t* aY) override
  { *aX = kMaxDimension; *aY = kMaxDimension; }

  // Widget position is controlled by the parent process via TabChild.
  virtual void Move(double aX, double aY) override {}

  virtual void Resize(double aWidth,
                      double aHeight,
                      bool   aRepaint) override;
  virtual void Resize(double aX,
                      double aY,
                      double aWidth,
                      double aHeight,
                      bool   aRepaint) override
  {
    if (!mBounds.IsEqualXY(aX, aY)) {
      NotifyWindowMoved(aX, aY);
    }
    mBounds.MoveTo(aX, aY);
    return Resize(aWidth, aHeight, aRepaint);
  }

  // XXX/cjones: copying gtk behavior here; unclear what disabling a
  // widget is supposed to entail
  virtual void Enable(bool aState) override
  { mEnabled = aState; }
  virtual bool IsEnabled() const override
  { return mEnabled; }

  virtual nsresult SetFocus(bool aRaise = false) override;

  virtual nsresult ConfigureChildren(const nsTArray<Configuration>& aConfigurations) override;

  virtual void Invalidate(const LayoutDeviceIntRect& aRect) override;

  // PuppetWidgets don't have native data, as they're purely nonnative.
  virtual void* GetNativeData(uint32_t aDataType) override;
#if defined(XP_WIN)
  void SetNativeData(uint32_t aDataType, uintptr_t aVal) override;
#endif

  // PuppetWidgets don't have any concept of titles.
  virtual nsresult SetTitle(const nsAString& aTitle) override
  { return NS_ERROR_UNEXPECTED; }

  virtual LayoutDeviceIntPoint WidgetToScreenOffset() override
  { return GetWindowPosition() + GetChromeOffset(); }

  int32_t RoundsWidgetCoordinatesTo() override;

  void InitEvent(WidgetGUIEvent& aEvent,
                 LayoutDeviceIntPoint* aPoint = nullptr);

  virtual nsresult DispatchEvent(WidgetGUIEvent* aEvent,
                                 nsEventStatus& aStatus) override;
  nsEventStatus DispatchInputEvent(WidgetInputEvent* aEvent) override;
  void SetConfirmedTargetAPZC(uint64_t aInputBlockId,
                              const nsTArray<ScrollableLayerGuid>& aTargets) const override;
  void UpdateZoomConstraints(const uint32_t& aPresShellId,
                             const FrameMetrics::ViewID& aViewId,
                             const mozilla::Maybe<ZoomConstraints>& aConstraints) override;
  bool AsyncPanZoomEnabled() const override;

  virtual void GetEditCommands(
                 NativeKeyBindingsType aType,
                 const mozilla::WidgetKeyboardEvent& aEvent,
                 nsTArray<mozilla::CommandInt>& aCommands) override;

  friend struct AutoCacheNativeKeyCommands;

  //
  // nsBaseWidget methods we override
  //

  // Documents loaded in child processes are always subdocuments of
  // other docs in an ancestor process.  To ensure that the
  // backgrounds of those documents are painted like those of
  // same-process subdocuments, we force the widget here to be
  // transparent, which in turn will cause layout to use a transparent
  // backstop background color.
  virtual nsTransparencyMode GetTransparencyMode() override
  { return eTransparencyTransparent; }

  virtual LayerManager*
  GetLayerManager(PLayerTransactionChild* aShadowManager = nullptr,
                  LayersBackend aBackendHint = mozilla::layers::LayersBackend::LAYERS_NONE,
                  LayerManagerPersistence aPersistence = LAYER_MANAGER_CURRENT) override;

  // This is used for creating remote layer managers and for re-creating
  // them after a compositor reset. The lambda aInitializeFunc is used to perform
  // any caller-required initialization for the newly created layer
  // manager; in the event of a failure, return false and it will destroy the
  // new layer manager without changing the state of the widget.
  bool CreateRemoteLayerManager(const std::function<bool(LayerManager*)>& aInitializeFunc);

  bool HasLayerManager()
  {
    return !!mLayerManager;
  }

  virtual void SetInputContext(const InputContext& aContext,
                               const InputContextAction& aAction) override;
  virtual InputContext GetInputContext() override;
  virtual NativeIMEContext GetNativeIMEContext() override;
  TextEventDispatcherListener* GetNativeTextEventDispatcherListener() override
  {
    return mNativeTextEventDispatcherListener ?
             mNativeTextEventDispatcherListener.get() : this;
  }
  void SetNativeTextEventDispatcherListener(TextEventDispatcherListener* aListener)
  { mNativeTextEventDispatcherListener = aListener; }

  virtual void SetCursor(nsCursor aCursor) override;
  virtual nsresult SetCursor(imgIContainer* aCursor,
                             uint32_t aHotspotX, uint32_t aHotspotY) override;

  virtual void ClearCachedCursor() override;

  // Gets the DPI of the screen corresponding to this widget.
  // Contacts the parent process which gets the DPI from the
  // proper widget there. TODO: Handle DPI changes that happen
  // later on.
  virtual float GetDPI() override;
  virtual double GetDefaultScaleInternal() override;

  virtual bool NeedsPaint() override;

  // Paint the widget immediately if any paints are queued up.
  void PaintNowIfNeeded();

  virtual TabChild* GetOwningTabChild() override { return mTabChild; }

  void UpdateBackingScaleCache(float aDpi, int32_t aRounding, double aScale)
  {
    mDPI = aDpi;
    mRounding = aRounding;
    mDefaultScale = aScale;
  }

  nsIntSize GetScreenDimensions();

  // Get the offset to the chrome of the window that this tab belongs to.
  LayoutDeviceIntPoint GetChromeOffset();

  // Get the screen position of the application window.
  LayoutDeviceIntPoint GetWindowPosition();

  virtual LayoutDeviceIntRect GetScreenBounds() override;

  virtual MOZ_MUST_USE nsresult
  StartPluginIME(const mozilla::WidgetKeyboardEvent& aKeyboardEvent,
                 int32_t aPanelX, int32_t aPanelY,
                 nsString& aCommitted) override;

  virtual void SetPluginFocused(bool& aFocused) override;
  virtual void DefaultProcOfPluginEvent(
                 const mozilla::WidgetPluginEvent& aEvent) override;

  virtual nsresult SynthesizeNativeKeyEvent(int32_t aNativeKeyboardLayout,
                                            int32_t aNativeKeyCode,
                                            uint32_t aModifierFlags,
                                            const nsAString& aCharacters,
                                            const nsAString& aUnmodifiedCharacters,
                                            nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeMouseEvent(LayoutDeviceIntPoint aPoint,
                                              uint32_t aNativeMessage,
                                              uint32_t aModifierFlags,
                                              nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeMouseMove(LayoutDeviceIntPoint aPoint,
                                             nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeMouseScrollEvent(LayoutDeviceIntPoint aPoint,
                                                    uint32_t aNativeMessage,
                                                    double aDeltaX,
                                                    double aDeltaY,
                                                    double aDeltaZ,
                                                    uint32_t aModifierFlags,
                                                    uint32_t aAdditionalFlags,
                                                    nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeTouchPoint(uint32_t aPointerId,
                                              TouchPointerState aPointerState,
                                              LayoutDeviceIntPoint aPoint,
                                              double aPointerPressure,
                                              uint32_t aPointerOrientation,
                                              nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeTouchTap(LayoutDeviceIntPoint aPoint,
                                            bool aLongTap,
                                            nsIObserver* aObserver) override;
  virtual nsresult ClearNativeTouchSequence(nsIObserver* aObserver) override;
  virtual uint32_t GetMaxTouchPoints() const override;

  virtual void StartAsyncScrollbarDrag(const AsyncDragMetrics& aDragMetrics) override;

  virtual void SetCandidateWindowForPlugin(
                 const CandidateWindowPosition& aPosition) override;
  virtual void EnableIMEForPlugin(bool aEnable) override;

  virtual void ZoomToRect(const uint32_t& aPresShellId,
                          const FrameMetrics::ViewID& aViewId,
                          const CSSRect& aRect,
                          const uint32_t& aFlags) override;

  virtual bool HasPendingInputEvent() override;

  void HandledWindowedPluginKeyEvent(const NativeEventData& aKeyEventData,
                                     bool aIsConsumed);

  virtual nsresult OnWindowedPluginKeyEvent(
                     const NativeEventData& aKeyEventData,
                     nsIKeyEventInPluginCallback* aCallback) override;

  virtual void LookUpDictionary(
                 const nsAString& aText,
                 const nsTArray<mozilla::FontRange>& aFontRangeArray,
                 const bool aIsVertical,
                 const LayoutDeviceIntPoint& aPoint) override;

  nsresult SetSystemFont(const nsCString& aFontName) override;
  nsresult GetSystemFont(nsCString& aFontName) override;

  nsresult SetPrefersReducedMotionOverrideForTest(bool aValue) override;
  nsresult ResetPrefersReducedMotionOverrideForTest() override;

  // TextEventDispatcherListener
  using nsBaseWidget::NotifyIME;
  NS_IMETHOD NotifyIME(TextEventDispatcher* aTextEventDispatcher,
                       const IMENotification& aNotification) override;
  NS_IMETHOD_(IMENotificationRequests) GetIMENotificationRequests() override;
  NS_IMETHOD_(void) OnRemovedFrom(
                      TextEventDispatcher* aTextEventDispatcher) override;
  NS_IMETHOD_(void) WillDispatchKeyboardEvent(
                      TextEventDispatcher* aTextEventDispatcher,
                      WidgetKeyboardEvent& aKeyboardEvent,
                      uint32_t aIndexOfKeypress,
                      void* aData) override;

  virtual void OnMemoryPressure(layers::MemoryPressureReason aWhy) override;
private:
  nsresult Paint();

  void SetChild(PuppetWidget* aChild);

  nsresult RequestIMEToCommitComposition(bool aCancel);
  nsresult NotifyIMEOfFocusChange(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfSelectionChange(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfCompositionUpdate(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfTextChange(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfMouseButtonEvent(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfPositionChange(const IMENotification& aIMENotification);

  bool CacheEditorRect();
  bool CacheCompositionRects(uint32_t& aStartOffset,
                             nsTArray<LayoutDeviceIntRect>& aRectArray,
                             uint32_t& aTargetCauseOffset);
  bool GetCaretRect(LayoutDeviceIntRect& aCaretRect, uint32_t aCaretOffset);
  uint32_t GetCaretOffset();

  nsIWidgetListener* GetCurrentWidgetListener();

  // When this widget caches input context and currently managed by
  // IMEStateManager, the cache is valid.
  bool HaveValidInputContextCache() const;

  class PaintTask : public Runnable {
  public:
    NS_DECL_NSIRUNNABLE
    explicit PaintTask(PuppetWidget* widget)
     : Runnable("PuppetWidget::PaintTask"), mWidget(widget) {}
    void Revoke() { mWidget = nullptr; }
  private:
    PuppetWidget* mWidget;
  };

  // TabChild normally holds a strong reference to this PuppetWidget
  // or its root ancestor, but each PuppetWidget also needs a
  // reference back to TabChild (e.g. to delegate nsIWidget IME calls
  // to chrome) So we hold a weak reference to TabChild here.  Since
  // it's possible for TabChild to outlive the PuppetWidget, we clear
  // this weak reference in Destroy()
  TabChild* mTabChild;
  // The "widget" to which we delegate events if we don't have an
  // event handler.
  RefPtr<PuppetWidget> mChild;
  LayoutDeviceIntRegion mDirtyRegion;
  nsRevocableEventPtr<PaintTask> mPaintTask;
  RefPtr<layers::MemoryPressureObserver> mMemoryPressureObserver;
  // XXX/cjones: keeping this around until we teach LayerManager to do
  // retained-content-only transactions
  RefPtr<DrawTarget> mDrawTarget;
  // IME
  IMENotificationRequests mIMENotificationRequestsOfParent;
  InputContext mInputContext;
  // mNativeIMEContext is initialized when this dispatches every composition
  // event both from parent process's widget and TextEventDispatcher in same
  // process.  If it hasn't been started composition yet, this isn't necessary
  // for XP code since there is no TextComposition instance which is caused by
  // the PuppetWidget instance.
  NativeIMEContext mNativeIMEContext;
  ContentCacheInChild mContentCache;

  // The DPI of the screen corresponding to this widget
  float mDPI;
  int32_t mRounding;
  double mDefaultScale;

  nsCOMPtr<imgIContainer> mCustomCursor;
  uint32_t mCursorHotspotX, mCursorHotspotY;

  nsCOMArray<nsIKeyEventInPluginCallback> mKeyEventInPluginCallbacks;

  RefPtr<TextEventDispatcherListener> mNativeTextEventDispatcherListener;

protected:
  bool mEnabled;
  bool mVisible;

private:
  bool mNeedIMEStateInit;
  // When remote process requests to commit/cancel a composition, the
  // composition may have already been committed in the main process.  In such
  // case, this will receive remaining composition events for the old
  // composition even after requesting to commit/cancel the old composition
  // but the TextComposition for the old composition has already been destroyed.
  // So, until this meets new eCompositionStart, following composition events
  // should be ignored if this is set to true.
  bool mIgnoreCompositionEvents;
};

class PuppetScreen : public nsBaseScreen
{
public:
    explicit PuppetScreen(void* nativeScreen);
    ~PuppetScreen();

    NS_IMETHOD GetRect(int32_t* aLeft, int32_t* aTop, int32_t* aWidth, int32_t* aHeight) override;
    NS_IMETHOD GetAvailRect(int32_t* aLeft, int32_t* aTop, int32_t* aWidth, int32_t* aHeight) override;
    NS_IMETHOD GetPixelDepth(int32_t* aPixelDepth) override;
    NS_IMETHOD GetColorDepth(int32_t* aColorDepth) override;
};

class PuppetScreenManager final : public nsIScreenManager
{
    ~PuppetScreenManager();

public:
    PuppetScreenManager();

    NS_DECL_ISUPPORTS
    NS_DECL_NSISCREENMANAGER

protected:
    nsCOMPtr<nsIScreen> mOneScreen;
};

} // namespace widget
} // namespace mozilla

#endif  // mozilla_widget_PuppetWidget_h__