Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 777 insertions, 0 deletions

diff --git a/widget/nsBaseWidget.h b/widget/nsBaseWidget.h
new file mode 100644
index 0000000000..8b6e8ad0eb
--- /dev/null
+++ b/widget/nsBaseWidget.h
@@ -0,0 +1,777 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+#ifndef nsBaseWidget_h__
+#define nsBaseWidget_h__
+
+#include "InputData.h"
+#include "mozilla/EventForwards.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/WidgetUtils.h"
+#include "mozilla/dom/MouseEventBinding.h"
+#include "mozilla/layers/APZCCallbackHelper.h"
+#include "mozilla/layers/CompositorOptions.h"
+#include "mozilla/layers/NativeLayer.h"
+#include "mozilla/widget/ThemeChangeKind.h"
+#include "mozilla/widget/WindowOcclusionState.h"
+#include "nsRect.h"
+#include "nsIWidget.h"
+#include "nsWidgetsCID.h"
+#include "nsIFile.h"
+#include "nsString.h"
+#include "nsCOMPtr.h"
+#include "nsIRollupListener.h"
+#include "nsIObserver.h"
+#include "nsIWidgetListener.h"
+#include "nsPIDOMWindow.h"
+#include "nsWeakReference.h"
+
+#include <algorithm>
+
+class nsIContent;
+class gfxContext;
+
+namespace mozilla {
+class CompositorVsyncDispatcher;
+class LiveResizeListener;
+class FallbackRenderer;
+class SwipeTracker;
+struct SwipeEventQueue;
+class WidgetWheelEvent;
+
+#ifdef ACCESSIBILITY
+namespace a11y {
+class LocalAccessible;
+}
+#endif
+
+namespace gfx {
+class DrawTarget;
+class SourceSurface;
+}  // namespace gfx
+
+namespace layers {
+class CompositorBridgeChild;
+class CompositorBridgeParent;
+class IAPZCTreeManager;
+class GeckoContentController;
+class APZEventState;
+struct APZEventResult;
+class CompositorSession;
+class ImageContainer;
+class WebRenderLayerManager;
+struct ScrollableLayerGuid;
+class RemoteCompositorSession;
+}  // namespace layers
+
+namespace widget {
+class CompositorWidgetDelegate;
+class InProcessCompositorWidget;
+class WidgetRenderingContext;
+}  // namespace widget
+
+class CompositorVsyncDispatcher;
+}  // namespace mozilla
+
+namespace base {
+class Thread;
+}  // namespace base
+
+// Windows specific constant indicating the maximum number of touch points the
+// inject api will allow. This also sets the maximum numerical value for touch
+// ids we can use when injecting touch points on Windows.
+#define TOUCH_INJECT_MAX_POINTS 256
+
+class nsBaseWidget;
+
+// Helper class used in shutting down gfx related code.
+class WidgetShutdownObserver final : public nsIObserver {
+  ~WidgetShutdownObserver();
+
+ public:
+  explicit WidgetShutdownObserver(nsBaseWidget* aWidget);
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  void Register();
+  void Unregister();
+
+  nsBaseWidget* mWidget;
+  bool mRegistered;
+};
+
+// Helper class used for observing locales change.
+class LocalesChangedObserver final : public nsIObserver {
+  ~LocalesChangedObserver();
+
+ public:
+  explicit LocalesChangedObserver(nsBaseWidget* aWidget);
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  void Register();
+  void Unregister();
+
+  nsBaseWidget* mWidget;
+  bool mRegistered;
+};
+
+/**
+ * Common widget implementation used as base class for native
+ * or crossplatform implementations of Widgets.
+ * All cross-platform behavior that all widgets need to implement
+ * should be placed in this class.
+ * (Note: widget implementations are not required to use this
+ * class, but it gives them a head start.)
+ */
+
+class nsBaseWidget : public nsIWidget, public nsSupportsWeakReference {
+  template <class EventType, class InputType>
+  friend class DispatchEventOnMainThread;
+  friend class mozilla::widget::InProcessCompositorWidget;
+  friend class mozilla::layers::RemoteCompositorSession;
+
+ protected:
+  typedef base::Thread Thread;
+  typedef mozilla::gfx::DrawTarget DrawTarget;
+  typedef mozilla::gfx::SourceSurface SourceSurface;
+  typedef mozilla::layers::BufferMode BufferMode;
+  typedef mozilla::layers::CompositorBridgeChild CompositorBridgeChild;
+  typedef mozilla::layers::CompositorBridgeParent CompositorBridgeParent;
+  typedef mozilla::layers::IAPZCTreeManager IAPZCTreeManager;
+  typedef mozilla::layers::GeckoContentController GeckoContentController;
+  typedef mozilla::layers::ScrollableLayerGuid ScrollableLayerGuid;
+  typedef mozilla::layers::APZEventState APZEventState;
+  typedef mozilla::CSSIntRect CSSIntRect;
+  typedef mozilla::CSSRect CSSRect;
+  typedef mozilla::ScreenRotation ScreenRotation;
+  typedef mozilla::widget::CompositorWidgetDelegate CompositorWidgetDelegate;
+  typedef mozilla::layers::CompositorSession CompositorSession;
+  typedef mozilla::layers::ImageContainer ImageContainer;
+
+  virtual ~nsBaseWidget();
+
+ public:
+  nsBaseWidget();
+
+  explicit nsBaseWidget(BorderStyle aBorderStyle);
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  // nsIWidget interface
+  void CaptureRollupEvents(bool aDoCapture) override {}
+  nsIWidgetListener* GetWidgetListener() const override;
+  void SetWidgetListener(nsIWidgetListener* alistener) override;
+  void Destroy() override;
+  void SetParent(nsIWidget* aNewParent) override{};
+  nsIWidget* GetParent() override;
+  nsIWidget* GetTopLevelWidget() override;
+  nsIWidget* GetSheetWindowParent(void) override;
+  float GetDPI() override;
+  void AddChild(nsIWidget* aChild) override;
+  void RemoveChild(nsIWidget* aChild) override;
+
+  void SetZIndex(int32_t aZIndex) override;
+  void PlaceBehind(nsTopLevelWidgetZPlacement aPlacement, nsIWidget* aWidget,
+                   bool aActivate) override {}
+
+  void GetWorkspaceID(nsAString& workspaceID) override;
+  void MoveToWorkspace(const nsAString& workspaceID) override;
+  bool IsTiled() const override { return mIsTiled; }
+
+  bool IsFullyOccluded() const override { return mIsFullyOccluded; }
+
+  void SetCursor(const Cursor&) override;
+  void SetCustomCursorAllowed(bool) override;
+  void ClearCachedCursor() final {
+    mCursor = {};
+    mUpdateCursor = true;
+  }
+  void SetTransparencyMode(TransparencyMode aMode) override;
+  TransparencyMode GetTransparencyMode() override;
+  void SetWindowShadowStyle(mozilla::WindowShadow) override {}
+  void SetShowsToolbarButton(bool aShow) override {}
+  void SetSupportsNativeFullscreen(bool aSupportsNativeFullscreen) override {}
+  void SetWindowAnimationType(WindowAnimationType aType) override {}
+  void HideWindowChrome(bool aShouldHide) override {}
+  bool PrepareForFullscreenTransition(nsISupports** aData) override {
+    return false;
+  }
+  void PerformFullscreenTransition(FullscreenTransitionStage aStage,
+                                   uint16_t aDuration, nsISupports* aData,
+                                   nsIRunnable* aCallback) override;
+  void CleanupFullscreenTransition() override {}
+  already_AddRefed<Screen> GetWidgetScreen() override;
+  nsresult MakeFullScreen(bool aFullScreen) override;
+  void InfallibleMakeFullScreen(bool aFullScreen);
+
+  WindowRenderer* GetWindowRenderer() override;
+  bool HasWindowRenderer() const final { return !!mWindowRenderer; }
+
+  // A remote compositor session tied to this window has been lost and IPC
+  // messages will no longer work. The widget must clean up any lingering
+  // resources and possibly schedule another paint.
+  //
+  // A reference to the session object is held until this function has
+  // returned. Callers should hold a reference to the widget, since this
+  // function could deallocate the widget if it is unparented.
+  virtual void NotifyCompositorSessionLost(
+      mozilla::layers::CompositorSession* aSession);
+
+  already_AddRefed<mozilla::CompositorVsyncDispatcher>
+  GetCompositorVsyncDispatcher();
+  virtual void CreateCompositorVsyncDispatcher();
+  virtual void CreateCompositor();
+  virtual void CreateCompositor(int aWidth, int aHeight);
+  virtual void SetCompositorWidgetDelegate(CompositorWidgetDelegate*) {}
+  void PrepareWindowEffects() override {}
+  void UpdateThemeGeometries(
+      const nsTArray<ThemeGeometry>& aThemeGeometries) override {}
+  void SetModal(bool aModal) override {}
+  uint32_t GetMaxTouchPoints() const override;
+  void SetWindowClass(const nsAString& xulWinType, const nsAString& xulWinClass,
+                      const nsAString& xulWinName) override {}
+  // Return whether this widget interprets parameters to Move and Resize APIs
+  // as "desktop pixels" rather than "device pixels", and therefore
+  // applies its GetDefaultScale() value to them before using them as mBounds
+  // etc (which are always stored in device pixels).
+  // Note that APIs that -get- the widget's position/size/bounds, rather than
+  // -setting- them (i.e. moving or resizing the widget) will always return
+  // values in the widget's device pixels.
+  bool BoundsUseDesktopPixels() const {
+    return mWindowType <= WindowType::Popup;
+  }
+  // Default implementation, to be overridden by platforms where desktop coords
+  // are virtualized and may not correspond to device pixels on the screen.
+  mozilla::DesktopToLayoutDeviceScale GetDesktopToDeviceScale() override {
+    return mozilla::DesktopToLayoutDeviceScale(1.0);
+  }
+  mozilla::DesktopToLayoutDeviceScale GetDesktopToDeviceScaleByScreen()
+      override;
+
+  void ConstrainPosition(DesktopIntPoint&) override {}
+  void MoveClient(const DesktopPoint& aOffset) override;
+  void ResizeClient(const DesktopSize& aSize, bool aRepaint) override;
+  void ResizeClient(const DesktopRect& aRect, bool aRepaint) override;
+  LayoutDeviceIntRect GetBounds() override;
+  LayoutDeviceIntRect GetClientBounds() override;
+  LayoutDeviceIntRect GetScreenBounds() override;
+  [[nodiscard]] nsresult GetRestoredBounds(LayoutDeviceIntRect& aRect) override;
+  nsresult SetNonClientMargins(const LayoutDeviceIntMargin&) override;
+  LayoutDeviceIntPoint GetClientOffset() override;
+  void EnableDragDrop(bool aEnable) override{};
+  nsresult AsyncEnableDragDrop(bool aEnable) override;
+  void SetResizeMargin(mozilla::LayoutDeviceIntCoord aResizeMargin) override;
+  [[nodiscard]] nsresult GetAttention(int32_t aCycleCount) override {
+    return NS_OK;
+  }
+  bool HasPendingInputEvent() override;
+  void SetIcon(const nsAString& aIconSpec) override {}
+  bool ShowsResizeIndicator(LayoutDeviceIntRect* aResizerRect) override;
+  void FreeNativeData(void* data, uint32_t aDataType) override {}
+  nsresult ActivateNativeMenuItemAt(const nsAString& indexString) override {
+    return NS_ERROR_NOT_IMPLEMENTED;
+  }
+  nsresult ForceUpdateNativeMenuAt(const nsAString& indexString) override {
+    return NS_ERROR_NOT_IMPLEMENTED;
+  }
+  nsresult NotifyIME(const IMENotification& aIMENotification) final;
+  [[nodiscard]] nsresult AttachNativeKeyEvent(
+      mozilla::WidgetKeyboardEvent& aEvent) override {
+    return NS_ERROR_NOT_IMPLEMENTED;
+  }
+  bool ComputeShouldAccelerate();
+  virtual bool WidgetTypeSupportsAcceleration() { return true; }
+  [[nodiscard]] nsresult OnDefaultButtonLoaded(
+      const LayoutDeviceIntRect& aButtonRect) override {
+    return NS_ERROR_NOT_IMPLEMENTED;
+  }
+  already_AddRefed<nsIWidget> CreateChild(
+      const LayoutDeviceIntRect& aRect, InitData* aInitData = nullptr,
+      bool aForceUseIWidgetParent = false) override;
+  void AttachViewToTopLevel(bool aUseAttachedEvents) override;
+  nsIWidgetListener* GetAttachedWidgetListener() const override;
+  void SetAttachedWidgetListener(nsIWidgetListener* aListener) override;
+  nsIWidgetListener* GetPreviouslyAttachedWidgetListener() override;
+  void SetPreviouslyAttachedWidgetListener(nsIWidgetListener*) override;
+  NativeIMEContext GetNativeIMEContext() override;
+  TextEventDispatcher* GetTextEventDispatcher() final;
+  TextEventDispatcherListener* GetNativeTextEventDispatcherListener() override;
+  void ZoomToRect(const uint32_t& aPresShellId,
+                  const ScrollableLayerGuid::ViewID& aViewId,
+                  const CSSRect& aRect, const uint32_t& aFlags) override;
+
+  // Dispatch an event that must be first be routed through APZ.
+  ContentAndAPZEventStatus DispatchInputEvent(
+      mozilla::WidgetInputEvent* aEvent) override;
+  void DispatchEventToAPZOnly(mozilla::WidgetInputEvent* aEvent) override;
+
+  bool DispatchWindowEvent(mozilla::WidgetGUIEvent& event) override;
+
+  void SetConfirmedTargetAPZC(
+      uint64_t aInputBlockId,
+      const nsTArray<ScrollableLayerGuid>& aTargets) const override;
+
+  void UpdateZoomConstraints(
+      const uint32_t& aPresShellId, const ScrollableLayerGuid::ViewID& aViewId,
+      const mozilla::Maybe<ZoomConstraints>& aConstraints) override;
+
+  bool AsyncPanZoomEnabled() const override;
+
+  void SwipeFinished() override;
+  void ReportSwipeStarted(uint64_t aInputBlockId, bool aStartSwipe) override;
+  void TrackScrollEventAsSwipe(const mozilla::PanGestureInput& aSwipeStartEvent,
+                               uint32_t aAllowedDirections,
+                               uint64_t aInputBlockId);
+  struct SwipeInfo {
+    bool wantsSwipe;
+    uint32_t allowedDirections;
+  };
+  SwipeInfo SendMayStartSwipe(const mozilla::PanGestureInput& aSwipeStartEvent);
+  // Returns a WidgetWheelEvent which needs to be handled by APZ regardless of
+  // whether |aPanInput| event was used for SwipeTracker or not.
+  mozilla::WidgetWheelEvent MayStartSwipeForAPZ(
+      const mozilla::PanGestureInput& aPanInput,
+      const mozilla::layers::APZEventResult& aApzResult);
+
+  // Returns true if |aPanInput| event was used for SwipeTracker, false
+  // otherwise.
+  bool MayStartSwipeForNonAPZ(const mozilla::PanGestureInput& aPanInput);
+
+  void NotifyWindowDestroyed();
+  void NotifySizeMoveDone();
+
+  using ByMoveToRect = nsIWidgetListener::ByMoveToRect;
+  void NotifyWindowMoved(int32_t aX, int32_t aY,
+                         ByMoveToRect = ByMoveToRect::No);
+
+  // Should be called by derived implementations to notify on system color and
+  // theme changes.
+  void NotifyThemeChanged(mozilla::widget::ThemeChangeKind);
+
+#ifdef ACCESSIBILITY
+  // Get the accessible for the window.
+  mozilla::a11y::LocalAccessible* GetRootAccessible();
+#endif
+
+  // Return true if this is a simple widget (that is typically not worth
+  // accelerating)
+  bool IsSmallPopup() const;
+
+  PopupLevel GetPopupLevel() { return mPopupLevel; }
+
+  // return true if this is a popup widget with a native titlebar
+  bool IsPopupWithTitleBar() const {
+    return (mWindowType == WindowType::Popup &&
+            mBorderStyle != BorderStyle::Default &&
+            mBorderStyle & BorderStyle::Title);
+  }
+
+  void ReparentNativeWidget(nsIWidget* aNewParent) override {}
+
+  const SizeConstraints GetSizeConstraints() override;
+  void SetSizeConstraints(const SizeConstraints& aConstraints) override;
+
+  void StartAsyncScrollbarDrag(const AsyncDragMetrics& aDragMetrics) override;
+
+  bool StartAsyncAutoscroll(const ScreenPoint& aAnchorLocation,
+                            const ScrollableLayerGuid& aGuid) override;
+
+  void StopAsyncAutoscroll(const ScrollableLayerGuid& aGuid) override;
+
+  mozilla::layers::LayersId GetRootLayerTreeId() override;
+
+  /**
+   * Use this when GetLayerManager() returns a BasicLayerManager
+   * (nsBaseWidget::GetLayerManager() does). This sets up the widget's
+   * layer manager to temporarily render into aTarget.
+   *
+   * |aNaturalWidgetBounds| is the un-rotated bounds of |aWidget|.
+   * |aRotation| is the "virtual rotation" to apply when rendering to
+   * the target.  When |aRotation| is ROTATION_0,
+   * |aNaturalWidgetBounds| is not used.
+   */
+  class AutoLayerManagerSetup {
+   public:
+    AutoLayerManagerSetup(nsBaseWidget* aWidget, gfxContext* aTarget,
+                          BufferMode aDoubleBuffering);
+    ~AutoLayerManagerSetup();
+
+   private:
+    nsBaseWidget* mWidget;
+    mozilla::FallbackRenderer* mRenderer = nullptr;
+  };
+  friend class AutoLayerManagerSetup;
+
+  virtual bool ShouldUseOffMainThreadCompositing();
+
+  static nsIRollupListener* GetActiveRollupListener();
+
+  void Shutdown();
+
+  void QuitIME();
+
+  // These functions should be called at the start and end of a "live" widget
+  // resize (i.e. when the window contents are repainting during the resize,
+  // such as when the user drags a window border). It will suppress the
+  // displayport during the live resize to avoid unneccessary overpainting.
+  void NotifyLiveResizeStarted();
+  void NotifyLiveResizeStopped();
+
+#if defined(MOZ_WIDGET_ANDROID)
+  void RecvToolbarAnimatorMessageFromCompositor(int32_t) override{};
+  void UpdateRootFrameMetrics(const ScreenPoint& aScrollOffset,
+                              const CSSToScreenScale& aZoom) override{};
+  void RecvScreenPixels(mozilla::ipc::Shmem&& aMem, const ScreenIntSize& aSize,
+                        bool aNeedsYFlip) override{};
+#endif
+
+  virtual void LocalesChanged() {}
+
+  virtual void NotifyOcclusionState(mozilla::widget::OcclusionState aState) {}
+
+ protected:
+  // These are methods for CompositorWidgetWrapper, and should only be
+  // accessed from that class. Derived widgets can choose which methods to
+  // implement, or none if supporting out-of-process compositing.
+  virtual bool PreRender(mozilla::widget::WidgetRenderingContext* aContext) {
+    return true;
+  }
+  virtual void PostRender(mozilla::widget::WidgetRenderingContext* aContext) {}
+  virtual RefPtr<mozilla::layers::NativeLayerRoot> GetNativeLayerRoot() {
+    return nullptr;
+  }
+  virtual already_AddRefed<DrawTarget> StartRemoteDrawing();
+  virtual already_AddRefed<DrawTarget> StartRemoteDrawingInRegion(
+      const LayoutDeviceIntRegion& aInvalidRegion, BufferMode* aBufferMode) {
+    return StartRemoteDrawing();
+  }
+  virtual void EndRemoteDrawing() {}
+  virtual void EndRemoteDrawingInRegion(
+      DrawTarget* aDrawTarget, const LayoutDeviceIntRegion& aInvalidRegion) {
+    EndRemoteDrawing();
+  }
+  virtual void CleanupRemoteDrawing() {}
+  virtual void CleanupWindowEffects() {}
+  virtual bool InitCompositor(mozilla::layers::Compositor* aCompositor) {
+    return true;
+  }
+  virtual uint32_t GetGLFrameBufferFormat();
+  virtual bool CompositorInitiallyPaused() { return false; }
+
+ protected:
+  void ResolveIconName(const nsAString& aIconName, const nsAString& aIconSuffix,
+                       nsIFile** aResult);
+  virtual void OnDestroy();
+  void BaseCreate(nsIWidget* aParent, InitData* aInitData);
+
+  virtual void ConfigureAPZCTreeManager();
+  virtual void ConfigureAPZControllerThread();
+  virtual already_AddRefed<GeckoContentController>
+  CreateRootContentController();
+
+  // Dispatch an event that has already been routed through APZ.
+  nsEventStatus ProcessUntransformedAPZEvent(
+      mozilla::WidgetInputEvent* aEvent,
+      const mozilla::layers::APZEventResult& aApzResult);
+
+  nsresult SynthesizeNativeKeyEvent(int32_t aNativeKeyboardLayout,
+                                    int32_t aNativeKeyCode,
+                                    uint32_t aModifierFlags,
+                                    const nsAString& aCharacters,
+                                    const nsAString& aUnmodifiedCharacters,
+                                    nsIObserver* aObserver) override {
+    mozilla::widget::AutoObserverNotifier notifier(aObserver, "keyevent");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult SynthesizeNativeMouseEvent(LayoutDeviceIntPoint aPoint,
+                                      NativeMouseMessage aNativeMessage,
+                                      mozilla::MouseButton aButton,
+                                      nsIWidget::Modifiers aModifierFlags,
+                                      nsIObserver* aObserver) override {
+    mozilla::widget::AutoObserverNotifier notifier(aObserver, "mouseevent");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult SynthesizeNativeMouseMove(LayoutDeviceIntPoint aPoint,
+                                     nsIObserver* aObserver) override {
+    mozilla::widget::AutoObserverNotifier notifier(aObserver, "mouseevent");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult SynthesizeNativeMouseScrollEvent(
+      LayoutDeviceIntPoint aPoint, uint32_t aNativeMessage, double aDeltaX,
+      double aDeltaY, double aDeltaZ, uint32_t aModifierFlags,
+      uint32_t aAdditionalFlags, nsIObserver* aObserver) override {
+    mozilla::widget::AutoObserverNotifier notifier(aObserver,
+                                                   "mousescrollevent");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult SynthesizeNativeTouchPoint(uint32_t aPointerId,
+                                      TouchPointerState aPointerState,
+                                      LayoutDeviceIntPoint aPoint,
+                                      double aPointerPressure,
+                                      uint32_t aPointerOrientation,
+                                      nsIObserver* aObserver) override {
+    mozilla::widget::AutoObserverNotifier notifier(aObserver, "touchpoint");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult SynthesizeNativeTouchPadPinch(TouchpadGesturePhase aEventPhase,
+                                         float aScale,
+                                         LayoutDeviceIntPoint aPoint,
+                                         int32_t aModifierFlags) override {
+    MOZ_RELEASE_ASSERT(
+        false, "This method is not implemented on the current platform");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult SynthesizeNativePenInput(uint32_t aPointerId,
+                                    TouchPointerState aPointerState,
+                                    LayoutDeviceIntPoint aPoint,
+                                    double aPressure, uint32_t aRotation,
+                                    int32_t aTiltX, int32_t aTiltY,
+                                    int32_t aButton,
+                                    nsIObserver* aObserver) override {
+    MOZ_RELEASE_ASSERT(
+        false, "This method is not implemented on the current platform");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult SynthesizeNativeTouchpadDoubleTap(LayoutDeviceIntPoint aPoint,
+                                             uint32_t aModifierFlags) override {
+    MOZ_RELEASE_ASSERT(
+        false, "This method is not implemented on the current platform");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult SynthesizeNativeTouchpadPan(TouchpadGesturePhase aEventPhase,
+                                       LayoutDeviceIntPoint aPoint,
+                                       double aDeltaX, double aDeltaY,
+                                       int32_t aModifierFlags,
+                                       nsIObserver* aObserver) override {
+    MOZ_RELEASE_ASSERT(
+        false, "This method is not implemented on the current platform");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  /**
+   * GetPseudoIMEContext() returns pseudo IME context when TextEventDispatcher
+   * has non-native input transaction.  Otherwise, returns nullptr.
+   */
+  void* GetPseudoIMEContext();
+
+ protected:
+  virtual already_AddRefed<nsIWidget> AllocateChildPopupWidget() {
+    return nsIWidget::CreateChildWindow();
+  }
+
+  WindowRenderer* CreateFallbackRenderer();
+
+  PopupType GetPopupType() const { return mPopupType; }
+
+  bool HasRemoteContent() const { return mHasRemoteContent; }
+
+  /**
+   * Apply the current size constraints to the given size.
+   *
+   * @param aWidth width to constrain
+   * @param aHeight height to constrain
+   */
+  void ConstrainSize(int32_t* aWidth, int32_t* aHeight) override {
+    SizeConstraints c = GetSizeConstraints();
+    *aWidth = std::max(c.mMinSize.width, std::min(c.mMaxSize.width, *aWidth));
+    *aHeight =
+        std::max(c.mMinSize.height, std::min(c.mMaxSize.height, *aHeight));
+  }
+
+  CompositorBridgeChild* GetRemoteRenderer() override;
+
+  void ClearCachedWebrenderResources() override;
+
+  void ClearWebrenderAnimationResources() override;
+
+  bool SetNeedFastSnaphot() override;
+
+  /**
+   * Notify the widget that this window is being used with OMTC.
+   */
+  virtual void WindowUsesOMTC() {}
+  virtual void RegisterTouchWindow() {}
+
+  mozilla::dom::Document* GetDocument() const;
+
+  void EnsureTextEventDispatcher();
+
+  // Notify the compositor that a device reset has occurred.
+  void OnRenderingDeviceReset();
+
+  bool UseAPZ();
+
+  bool AllowWebRenderForThisWindow();
+
+  /**
+   * For widgets that support synthesizing native touch events, this function
+   * can be used to manage the current state of synthetic pointers. Each widget
+   * must maintain its own MultiTouchInput instance and pass it in as the state,
+   * along with the desired parameters for the changes. This function returns
+   * a new MultiTouchInput object that is ready to be dispatched.
+   */
+  mozilla::MultiTouchInput UpdateSynthesizedTouchState(
+      mozilla::MultiTouchInput* aState, mozilla::TimeStamp aTimeStamp,
+      uint32_t aPointerId, TouchPointerState aPointerState,
+      LayoutDeviceIntPoint aPoint, double aPointerPressure,
+      uint32_t aPointerOrientation);
+
+  /**
+   * Dispatch the given MultiTouchInput through APZ to Gecko (if APZ is enabled)
+   * or directly to gecko (if APZ is not enabled). This function must only
+   * be called from the main thread, and if APZ is enabled, that must also be
+   * the APZ controller thread.
+   */
+  void DispatchTouchInput(
+      mozilla::MultiTouchInput& aInput,
+      uint16_t aInputSource =
+          mozilla::dom::MouseEvent_Binding::MOZ_SOURCE_TOUCH);
+
+  /**
+   * Dispatch the given PanGestureInput through APZ to Gecko (if APZ is enabled)
+   * or directly to gecko (if APZ is not enabled). This function must only
+   * be called from the main thread, and if APZ is enabled, that must also be
+   * the APZ controller thread.
+   */
+  void DispatchPanGestureInput(mozilla::PanGestureInput& aInput);
+  void DispatchPinchGestureInput(mozilla::PinchGestureInput& aInput);
+
+  static bool ConvertStatus(nsEventStatus aStatus) {
+    return aStatus == nsEventStatus_eConsumeNoDefault;
+  }
+
+ protected:
+  // Returns whether compositing should use an external surface size.
+  virtual bool UseExternalCompositingSurface() const { return false; }
+
+  /**
+   * Starts the OMTC compositor destruction sequence.
+   *
+   * When this function returns, the compositor should not be
+   * able to access the opengl context anymore.
+   * It is safe to call it several times if platform implementations
+   * require the compositor to be destroyed before ~nsBaseWidget is
+   * reached (This is the case with gtk2 for instance).
+   */
+  virtual void DestroyCompositor();
+  void DestroyLayerManager();
+  void ReleaseContentController();
+  void RevokeTransactionIdAllocator();
+
+  void FreeShutdownObserver();
+  void FreeLocalesChangedObserver();
+
+  bool IsPIPWindow() const { return mIsPIPWindow; };
+
+  nsIWidgetListener* mWidgetListener;
+  nsIWidgetListener* mAttachedWidgetListener;
+  nsIWidgetListener* mPreviouslyAttachedWidgetListener;
+  RefPtr<WindowRenderer> mWindowRenderer;
+  RefPtr<CompositorSession> mCompositorSession;
+  RefPtr<CompositorBridgeChild> mCompositorBridgeChild;
+
+  mozilla::UniquePtr<mozilla::Mutex> mCompositorVsyncDispatcherLock;
+  RefPtr<mozilla::CompositorVsyncDispatcher> mCompositorVsyncDispatcher;
+
+  RefPtr<IAPZCTreeManager> mAPZC;
+  RefPtr<GeckoContentController> mRootContentController;
+  RefPtr<APZEventState> mAPZEventState;
+  RefPtr<WidgetShutdownObserver> mShutdownObserver;
+  RefPtr<LocalesChangedObserver> mLocalesChangedObserver;
+  RefPtr<TextEventDispatcher> mTextEventDispatcher;
+  RefPtr<mozilla::SwipeTracker> mSwipeTracker;
+  mozilla::UniquePtr<mozilla::SwipeEventQueue> mSwipeEventQueue;
+  Cursor mCursor;
+  bool mCustomCursorAllowed = true;
+  BorderStyle mBorderStyle;
+  LayoutDeviceIntRect mBounds;
+  bool mIsTiled;
+  PopupLevel mPopupLevel;
+  PopupType mPopupType;
+  SizeConstraints mSizeConstraints;
+  bool mHasRemoteContent;
+
+  struct FullscreenSavedState {
+    DesktopRect windowRect;
+    DesktopRect screenRect;
+  };
+  mozilla::Maybe<FullscreenSavedState> mSavedBounds;
+
+  bool mUpdateCursor;
+  bool mUseAttachedEvents;
+  bool mIMEHasFocus;
+  bool mIMEHasQuit;
+  bool mIsFullyOccluded;
+  bool mNeedFastSnaphot;
+  // This flag is only used when APZ is off. It indicates that the current pan
+  // gesture was processed as a swipe. Sometimes the swipe animation can finish
+  // before momentum events of the pan gesture have stopped firing, so this
+  // flag tells us that we shouldn't allow the remaining events to cause
+  // scrolling. It is reset to false once a new gesture starts (as indicated by
+  // a PANGESTURE_(MAY)START event).
+  bool mCurrentPanGestureBelongsToSwipe;
+
+  // It's PictureInPicture window.
+  bool mIsPIPWindow : 1;
+
+  struct InitialZoomConstraints {
+    InitialZoomConstraints(const uint32_t& aPresShellID,
+                           const ScrollableLayerGuid::ViewID& aViewID,
+                           const ZoomConstraints& aConstraints)
+        : mPresShellID(aPresShellID),
+          mViewID(aViewID),
+          mConstraints(aConstraints) {}
+
+    uint32_t mPresShellID;
+    ScrollableLayerGuid::ViewID mViewID;
+    ZoomConstraints mConstraints;
+  };
+
+  mozilla::Maybe<InitialZoomConstraints> mInitialZoomConstraints;
+
+  // This points to the resize listeners who have been notified that a live
+  // resize is in progress. This should always be empty when a live-resize is
+  // not in progress.
+  nsTArray<RefPtr<mozilla::LiveResizeListener>> mLiveResizeListeners;
+
+#ifdef DEBUG
+ protected:
+  static nsAutoString debug_GuiEventToString(
+      mozilla::WidgetGUIEvent* aGuiEvent);
+
+  static void debug_DumpInvalidate(FILE* aFileOut, nsIWidget* aWidget,
+                                   const LayoutDeviceIntRect* aRect,
+                                   const char* aWidgetName, int32_t aWindowID);
+
+  static void debug_DumpEvent(FILE* aFileOut, nsIWidget* aWidget,
+                              mozilla::WidgetGUIEvent* aGuiEvent,
+                              const char* aWidgetName, int32_t aWindowID);
+
+  static void debug_DumpPaintEvent(FILE* aFileOut, nsIWidget* aWidget,
+                                   const nsIntRegion& aPaintEvent,
+                                   const char* aWidgetName, int32_t aWindowID);
+
+  static bool debug_GetCachedBoolPref(const char* aPrefName);
+#endif
+
+ private:
+  already_AddRefed<mozilla::layers::WebRenderLayerManager>
+  CreateCompositorSession(int aWidth, int aHeight,
+                          mozilla::layers::CompositorOptions* aOptionsOut);
+};
+
+#endif  // nsBaseWidget_h__