widget/nsBaseWidget.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5 #ifndef nsBaseWidget_h__
   6 #define nsBaseWidget_h__
   7
   8 #include "InputData.h"
   9 #include "mozilla/EventForwards.h"
  10 #include "mozilla/Mutex.h"
  11 #include "mozilla/RefPtr.h"
  12 #include "mozilla/UniquePtr.h"
  13 #include "mozilla/WidgetUtils.h"
  14 #include "mozilla/dom/MouseEventBinding.h"
  15 #include "mozilla/layers/APZCCallbackHelper.h"
  16 #include "mozilla/layers/CompositorOptions.h"
  17 #include "mozilla/layers/NativeLayer.h"
  18 #include "mozilla/widget/ThemeChangeKind.h"
  19 #include "mozilla/widget/WindowOcclusionState.h"
  20 #include "nsRect.h"
  21 #include "nsIWidget.h"
  22 #include "nsWidgetsCID.h"
  23 #include "nsIFile.h"
  24 #include "nsString.h"
  25 #include "nsCOMPtr.h"
  26 #include "nsIRollupListener.h"
  27 #include "nsIObserver.h"
  28 #include "nsIWidgetListener.h"
  29 #include "nsPIDOMWindow.h"
  30 #include "nsWeakReference.h"
  31
  32 #include <algorithm>
  33
  34 class nsIContent;
  35 class gfxContext;
  36
  37 namespace mozilla {
  38 class CompositorVsyncDispatcher;
  39 class LiveResizeListener;
  40 class FallbackRenderer;
  41 class SwipeTracker;
  42 struct SwipeEventQueue;
  43 class WidgetWheelEvent;
  44
  45 #ifdef ACCESSIBILITY
  46 namespace a11y {
  47 class LocalAccessible;
  48 }
  49 #endif
  50
  51 namespace gfx {
  52 class DrawTarget;
  53 class SourceSurface;
  54 }  // namespace gfx
  55
  56 namespace layers {
  57 class CompositorBridgeChild;
  58 class CompositorBridgeParent;
  59 class IAPZCTreeManager;
  60 class GeckoContentController;
  61 class APZEventState;
  62 struct APZEventResult;
  63 class CompositorSession;
  64 class ImageContainer;
  65 class WebRenderLayerManager;
  66 struct ScrollableLayerGuid;
  67 class RemoteCompositorSession;
  68 }  // namespace layers
  69
  70 namespace widget {
  71 class CompositorWidgetDelegate;
  72 class InProcessCompositorWidget;
  73 class WidgetRenderingContext;
  74 }  // namespace widget
  75
  76 class CompositorVsyncDispatcher;
  77 }  // namespace mozilla
  78
  79 namespace base {
  80 class Thread;
  81 }  // namespace base
  82
  83 // Windows specific constant indicating the maximum number of touch points the
  84 // inject api will allow. This also sets the maximum numerical value for touch
  85 // ids we can use when injecting touch points on Windows.
  86 #define TOUCH_INJECT_MAX_POINTS 256
  87
  88 class nsBaseWidget;
  89
  90 // Helper class used in shutting down gfx related code.
  91 class WidgetShutdownObserver final : public nsIObserver {
  92   ~WidgetShutdownObserver();
  93
  94  public:
  95   explicit WidgetShutdownObserver(nsBaseWidget* aWidget);
  96
  97   NS_DECL_ISUPPORTS
  98   NS_DECL_NSIOBSERVER
  99
 100   void Register();
 101   void Unregister();
 102
 103   nsBaseWidget* mWidget;
 104   bool mRegistered;
 105 };
 106
 107 // Helper class used for observing locales change.
 108 class LocalesChangedObserver final : public nsIObserver {
 109   ~LocalesChangedObserver();
 110
 111  public:
 112   explicit LocalesChangedObserver(nsBaseWidget* aWidget);
 113
 114   NS_DECL_ISUPPORTS
 115   NS_DECL_NSIOBSERVER
 116
 117   void Register();
 118   void Unregister();
 119
 120   nsBaseWidget* mWidget;
 121   bool mRegistered;
 122 };
 123
 124 /**
 125  * Common widget implementation used as base class for native
 126  * or crossplatform implementations of Widgets.
 127  * All cross-platform behavior that all widgets need to implement
 128  * should be placed in this class.
 129  * (Note: widget implementations are not required to use this
 130  * class, but it gives them a head start.)
 131  */
 132
 133 class nsBaseWidget : public nsIWidget, public nsSupportsWeakReference {
 134   template <class EventType, class InputType>
 135   friend class DispatchEventOnMainThread;
 136   friend class mozilla::widget::InProcessCompositorWidget;
 137   friend class mozilla::layers::RemoteCompositorSession;
 138
 139  protected:
 140   typedef base::Thread Thread;
 141   typedef mozilla::gfx::DrawTarget DrawTarget;
 142   typedef mozilla::gfx::SourceSurface SourceSurface;
 143   typedef mozilla::layers::BufferMode BufferMode;
 144   typedef mozilla::layers::CompositorBridgeChild CompositorBridgeChild;
 145   typedef mozilla::layers::CompositorBridgeParent CompositorBridgeParent;
 146   typedef mozilla::layers::IAPZCTreeManager IAPZCTreeManager;
 147   typedef mozilla::layers::GeckoContentController GeckoContentController;
 148   typedef mozilla::layers::ScrollableLayerGuid ScrollableLayerGuid;
 149   typedef mozilla::layers::APZEventState APZEventState;
 150   typedef mozilla::CSSIntRect CSSIntRect;
 151   typedef mozilla::CSSRect CSSRect;
 152   typedef mozilla::ScreenRotation ScreenRotation;
 153   typedef mozilla::widget::CompositorWidgetDelegate CompositorWidgetDelegate;
 154   typedef mozilla::layers::CompositorSession CompositorSession;
 155   typedef mozilla::layers::ImageContainer ImageContainer;
 156
 157   virtual ~nsBaseWidget();
 158
 159  public:
 160   nsBaseWidget();
 161
 162   explicit nsBaseWidget(BorderStyle aBorderStyle);
 163
 164   NS_DECL_THREADSAFE_ISUPPORTS
 165
 166   // nsIWidget interface
 167   void CaptureRollupEvents(bool aDoCapture) override {}
 168   nsIWidgetListener* GetWidgetListener() const override;
 169   void SetWidgetListener(nsIWidgetListener* alistener) override;
 170   void Destroy() override;
 171   void SetParent(nsIWidget* aNewParent) override{};
 172   nsIWidget* GetParent() override;
 173   nsIWidget* GetTopLevelWidget() override;
 174   nsIWidget* GetSheetWindowParent(void) override;
 175   float GetDPI() override;
 176   void AddChild(nsIWidget* aChild) override;
 177   void RemoveChild(nsIWidget* aChild) override;
 178
 179   void SetZIndex(int32_t aZIndex) override;
 180   void PlaceBehind(nsTopLevelWidgetZPlacement aPlacement, nsIWidget* aWidget,
 181                    bool aActivate) override {}
 182
 183   void GetWorkspaceID(nsAString& workspaceID) override;
 184   void MoveToWorkspace(const nsAString& workspaceID) override;
 185   bool IsTiled() const override { return mIsTiled; }
 186
 187   bool IsFullyOccluded() const override { return mIsFullyOccluded; }
 188
 189   void SetCursor(const Cursor&) override;
 190   void ClearCachedCursor() final {
 191     mCursor = {};
 192     mUpdateCursor = true;
 193   }
 194   void SetTransparencyMode(TransparencyMode aMode) override;
 195   TransparencyMode GetTransparencyMode() override;
 196   void SetWindowShadowStyle(mozilla::StyleWindowShadow aStyle) override {}
 197   void SetShowsToolbarButton(bool aShow) override {}
 198   void SetSupportsNativeFullscreen(bool aSupportsNativeFullscreen) override {}
 199   void SetWindowAnimationType(WindowAnimationType aType) override {}
 200   void HideWindowChrome(bool aShouldHide) override {}
 201   bool PrepareForFullscreenTransition(nsISupports** aData) override {
 202     return false;
 203   }
 204   void PerformFullscreenTransition(FullscreenTransitionStage aStage,
 205                                    uint16_t aDuration, nsISupports* aData,
 206                                    nsIRunnable* aCallback) override;
 207   void CleanupFullscreenTransition() override {}
 208   already_AddRefed<Screen> GetWidgetScreen() override;
 209   nsresult MakeFullScreen(bool aFullScreen) override;
 210   void InfallibleMakeFullScreen(bool aFullScreen);
 211
 212   WindowRenderer* GetWindowRenderer() override;
 213   bool HasWindowRenderer() const final { return !!mWindowRenderer; }
 214
 215   // A remote compositor session tied to this window has been lost and IPC
 216   // messages will no longer work. The widget must clean up any lingering
 217   // resources and possibly schedule another paint.
 218   //
 219   // A reference to the session object is held until this function has
 220   // returned.
 221   virtual void NotifyCompositorSessionLost(
 222       mozilla::layers::CompositorSession* aSession);
 223
 224   already_AddRefed<mozilla::CompositorVsyncDispatcher>
 225   GetCompositorVsyncDispatcher();
 226   virtual void CreateCompositorVsyncDispatcher();
 227   virtual void CreateCompositor();
 228   virtual void CreateCompositor(int aWidth, int aHeight);
 229   virtual void SetCompositorWidgetDelegate(CompositorWidgetDelegate*) {}
 230   void PrepareWindowEffects() override {}
 231   void UpdateThemeGeometries(
 232       const nsTArray<ThemeGeometry>& aThemeGeometries) override {}
 233   void SetModal(bool aModal) override {}
 234   uint32_t GetMaxTouchPoints() const override;
 235   void SetWindowClass(const nsAString& xulWinType, const nsAString& xulWinClass,
 236                       const nsAString& xulWinName) override {}
 237   // Return whether this widget interprets parameters to Move and Resize APIs
 238   // as "desktop pixels" rather than "device pixels", and therefore
 239   // applies its GetDefaultScale() value to them before using them as mBounds
 240   // etc (which are always stored in device pixels).
 241   // Note that APIs that -get- the widget's position/size/bounds, rather than
 242   // -setting- them (i.e. moving or resizing the widget) will always return
 243   // values in the widget's device pixels.
 244   bool BoundsUseDesktopPixels() const {
 245     return mWindowType <= WindowType::Popup;
 246   }
 247   // Default implementation, to be overridden by platforms where desktop coords
 248   // are virtualized and may not correspond to device pixels on the screen.
 249   mozilla::DesktopToLayoutDeviceScale GetDesktopToDeviceScale() override {
 250     return mozilla::DesktopToLayoutDeviceScale(1.0);
 251   }
 252   mozilla::DesktopToLayoutDeviceScale GetDesktopToDeviceScaleByScreen()
 253       override;
 254
 255   void ConstrainPosition(DesktopIntPoint&) override {}
 256   void MoveClient(const DesktopPoint& aOffset) override;
 257   void ResizeClient(const DesktopSize& aSize, bool aRepaint) override;
 258   void ResizeClient(const DesktopRect& aRect, bool aRepaint) override;
 259   LayoutDeviceIntRect GetBounds() override;
 260   LayoutDeviceIntRect GetClientBounds() override;
 261   LayoutDeviceIntRect GetScreenBounds() override;
 262   [[nodiscard]] nsresult GetRestoredBounds(LayoutDeviceIntRect& aRect) override;
 263   nsresult SetNonClientMargins(const LayoutDeviceIntMargin&) override;
 264   LayoutDeviceIntPoint GetClientOffset() override;
 265   void EnableDragDrop(bool aEnable) override{};
 266   nsresult AsyncEnableDragDrop(bool aEnable) override;
 267   void SetResizeMargin(mozilla::LayoutDeviceIntCoord aResizeMargin) override;
 268   [[nodiscard]] nsresult GetAttention(int32_t aCycleCount) override {
 269     return NS_OK;
 270   }
 271   bool HasPendingInputEvent() override;
 272   void SetIcon(const nsAString& aIconSpec) override {}
 273   void SetDrawsInTitlebar(bool aState) override {}
 274   bool ShowsResizeIndicator(LayoutDeviceIntRect* aResizerRect) override;
 275   void FreeNativeData(void* data, uint32_t aDataType) override {}
 276   nsresult ActivateNativeMenuItemAt(const nsAString& indexString) override {
 277     return NS_ERROR_NOT_IMPLEMENTED;
 278   }
 279   nsresult ForceUpdateNativeMenuAt(const nsAString& indexString) override {
 280     return NS_ERROR_NOT_IMPLEMENTED;
 281   }
 282   nsresult NotifyIME(const IMENotification& aIMENotification) final;
 283   [[nodiscard]] nsresult AttachNativeKeyEvent(
 284       mozilla::WidgetKeyboardEvent& aEvent) override {
 285     return NS_ERROR_NOT_IMPLEMENTED;
 286   }
 287   bool ComputeShouldAccelerate();
 288   virtual bool WidgetTypeSupportsAcceleration() { return true; }
 289   [[nodiscard]] nsresult OnDefaultButtonLoaded(
 290       const LayoutDeviceIntRect& aButtonRect) override {
 291     return NS_ERROR_NOT_IMPLEMENTED;
 292   }
 293   already_AddRefed<nsIWidget> CreateChild(
 294       const LayoutDeviceIntRect& aRect, InitData* aInitData = nullptr,
 295       bool aForceUseIWidgetParent = false) override;
 296   void AttachViewToTopLevel(bool aUseAttachedEvents) override;
 297   nsIWidgetListener* GetAttachedWidgetListener() const override;
 298   void SetAttachedWidgetListener(nsIWidgetListener* aListener) override;
 299   nsIWidgetListener* GetPreviouslyAttachedWidgetListener() override;
 300   void SetPreviouslyAttachedWidgetListener(nsIWidgetListener*) override;
 301   NativeIMEContext GetNativeIMEContext() override;
 302   TextEventDispatcher* GetTextEventDispatcher() final;
 303   TextEventDispatcherListener* GetNativeTextEventDispatcherListener() override;
 304   void ZoomToRect(const uint32_t& aPresShellId,
 305                   const ScrollableLayerGuid::ViewID& aViewId,
 306                   const CSSRect& aRect, const uint32_t& aFlags) override;
 307
 308   // Dispatch an event that must be first be routed through APZ.
 309   ContentAndAPZEventStatus DispatchInputEvent(
 310       mozilla::WidgetInputEvent* aEvent) override;
 311   void DispatchEventToAPZOnly(mozilla::WidgetInputEvent* aEvent) override;
 312
 313   bool DispatchWindowEvent(mozilla::WidgetGUIEvent& event) override;
 314
 315   void SetConfirmedTargetAPZC(
 316       uint64_t aInputBlockId,
 317       const nsTArray<ScrollableLayerGuid>& aTargets) const override;
 318
 319   void UpdateZoomConstraints(
 320       const uint32_t& aPresShellId, const ScrollableLayerGuid::ViewID& aViewId,
 321       const mozilla::Maybe<ZoomConstraints>& aConstraints) override;
 322
 323   bool AsyncPanZoomEnabled() const override;
 324
 325   void SwipeFinished() override;
 326   void ReportSwipeStarted(uint64_t aInputBlockId, bool aStartSwipe) override;
 327   void TrackScrollEventAsSwipe(const mozilla::PanGestureInput& aSwipeStartEvent,
 328                                uint32_t aAllowedDirections,
 329                                uint64_t aInputBlockId);
 330   struct SwipeInfo {
 331     bool wantsSwipe;
 332     uint32_t allowedDirections;
 333   };
 334   SwipeInfo SendMayStartSwipe(const mozilla::PanGestureInput& aSwipeStartEvent);
 335   // Returns a WidgetWheelEvent which needs to be handled by APZ regardless of
 336   // whether |aPanInput| event was used for SwipeTracker or not.
 337   mozilla::WidgetWheelEvent MayStartSwipeForAPZ(
 338       const mozilla::PanGestureInput& aPanInput,
 339       const mozilla::layers::APZEventResult& aApzResult);
 340
 341   // Returns true if |aPanInput| event was used for SwipeTracker, false
 342   // otherwise.
 343   bool MayStartSwipeForNonAPZ(const mozilla::PanGestureInput& aPanInput);
 344
 345   void NotifyWindowDestroyed();
 346   void NotifySizeMoveDone();
 347
 348   using ByMoveToRect = nsIWidgetListener::ByMoveToRect;
 349   void NotifyWindowMoved(int32_t aX, int32_t aY,
 350                          ByMoveToRect = ByMoveToRect::No);
 351
 352   // Should be called by derived implementations to notify on system color and
 353   // theme changes.
 354   void NotifyThemeChanged(mozilla::widget::ThemeChangeKind);
 355
 356 #ifdef ACCESSIBILITY
 357   // Get the accessible for the window.
 358   mozilla::a11y::LocalAccessible* GetRootAccessible();
 359 #endif
 360
 361   // Return true if this is a simple widget (that is typically not worth
 362   // accelerating)
 363   bool IsSmallPopup() const;
 364
 365   PopupLevel GetPopupLevel() { return mPopupLevel; }
 366
 367   // return true if this is a popup widget with a native titlebar
 368   bool IsPopupWithTitleBar() const {
 369     return (mWindowType == WindowType::Popup &&
 370             mBorderStyle != BorderStyle::Default &&
 371             mBorderStyle & BorderStyle::Title);
 372   }
 373
 374   void ReparentNativeWidget(nsIWidget* aNewParent) override {}
 375
 376   const SizeConstraints GetSizeConstraints() override;
 377   void SetSizeConstraints(const SizeConstraints& aConstraints) override;
 378
 379   void StartAsyncScrollbarDrag(const AsyncDragMetrics& aDragMetrics) override;
 380
 381   bool StartAsyncAutoscroll(const ScreenPoint& aAnchorLocation,
 382                             const ScrollableLayerGuid& aGuid) override;
 383
 384   void StopAsyncAutoscroll(const ScrollableLayerGuid& aGuid) override;
 385
 386   mozilla::layers::LayersId GetRootLayerTreeId() override;
 387
 388   /**
 389    * Use this when GetLayerManager() returns a BasicLayerManager
 390    * (nsBaseWidget::GetLayerManager() does). This sets up the widget's
 391    * layer manager to temporarily render into aTarget.
 392    *
 393    * |aNaturalWidgetBounds| is the un-rotated bounds of |aWidget|.
 394    * |aRotation| is the "virtual rotation" to apply when rendering to
 395    * the target.  When |aRotation| is ROTATION_0,
 396    * |aNaturalWidgetBounds| is not used.
 397    */
 398   class AutoLayerManagerSetup {
 399    public:
 400     AutoLayerManagerSetup(nsBaseWidget* aWidget, gfxContext* aTarget,
 401                           BufferMode aDoubleBuffering);
 402     ~AutoLayerManagerSetup();
 403
 404    private:
 405     nsBaseWidget* mWidget;
 406     mozilla::FallbackRenderer* mRenderer = nullptr;
 407   };
 408   friend class AutoLayerManagerSetup;
 409
 410   virtual bool ShouldUseOffMainThreadCompositing();
 411
 412   static nsIRollupListener* GetActiveRollupListener();
 413
 414   void Shutdown();
 415
 416   void QuitIME();
 417
 418   // These functions should be called at the start and end of a "live" widget
 419   // resize (i.e. when the window contents are repainting during the resize,
 420   // such as when the user drags a window border). It will suppress the
 421   // displayport during the live resize to avoid unneccessary overpainting.
 422   void NotifyLiveResizeStarted();
 423   void NotifyLiveResizeStopped();
 424
 425 #if defined(MOZ_WIDGET_ANDROID)
 426   void RecvToolbarAnimatorMessageFromCompositor(int32_t) override{};
 427   void UpdateRootFrameMetrics(const ScreenPoint& aScrollOffset,
 428                               const CSSToScreenScale& aZoom) override{};
 429   void RecvScreenPixels(mozilla::ipc::Shmem&& aMem, const ScreenIntSize& aSize,
 430                         bool aNeedsYFlip) override{};
 431 #endif
 432
 433   virtual void LocalesChanged() {}
 434
 435   virtual void NotifyOcclusionState(mozilla::widget::OcclusionState aState) {}
 436
 437  protected:
 438   // These are methods for CompositorWidgetWrapper, and should only be
 439   // accessed from that class. Derived widgets can choose which methods to
 440   // implement, or none if supporting out-of-process compositing.
 441   virtual bool PreRender(mozilla::widget::WidgetRenderingContext* aContext) {
 442     return true;
 443   }
 444   virtual void PostRender(mozilla::widget::WidgetRenderingContext* aContext) {}
 445   virtual RefPtr<mozilla::layers::NativeLayerRoot> GetNativeLayerRoot() {
 446     return nullptr;
 447   }
 448   virtual already_AddRefed<DrawTarget> StartRemoteDrawing();
 449   virtual already_AddRefed<DrawTarget> StartRemoteDrawingInRegion(
 450       const LayoutDeviceIntRegion& aInvalidRegion, BufferMode* aBufferMode) {
 451     return StartRemoteDrawing();
 452   }
 453   virtual void EndRemoteDrawing() {}
 454   virtual void EndRemoteDrawingInRegion(
 455       DrawTarget* aDrawTarget, const LayoutDeviceIntRegion& aInvalidRegion) {
 456     EndRemoteDrawing();
 457   }
 458   virtual void CleanupRemoteDrawing() {}
 459   virtual void CleanupWindowEffects() {}
 460   virtual bool InitCompositor(mozilla::layers::Compositor* aCompositor) {
 461     return true;
 462   }
 463   virtual uint32_t GetGLFrameBufferFormat();
 464   virtual bool CompositorInitiallyPaused() { return false; }
 465
 466  protected:
 467   void ResolveIconName(const nsAString& aIconName, const nsAString& aIconSuffix,
 468                        nsIFile** aResult);
 469   virtual void OnDestroy();
 470   void BaseCreate(nsIWidget* aParent, InitData* aInitData);
 471
 472   virtual void ConfigureAPZCTreeManager();
 473   virtual void ConfigureAPZControllerThread();
 474   virtual already_AddRefed<GeckoContentController>
 475   CreateRootContentController();
 476
 477   // Dispatch an event that has already been routed through APZ.
 478   nsEventStatus ProcessUntransformedAPZEvent(
 479       mozilla::WidgetInputEvent* aEvent,
 480       const mozilla::layers::APZEventResult& aApzResult);
 481
 482   nsresult SynthesizeNativeKeyEvent(int32_t aNativeKeyboardLayout,
 483                                     int32_t aNativeKeyCode,
 484                                     uint32_t aModifierFlags,
 485                                     const nsAString& aCharacters,
 486                                     const nsAString& aUnmodifiedCharacters,
 487                                     nsIObserver* aObserver) override {
 488     mozilla::widget::AutoObserverNotifier notifier(aObserver, "keyevent");
 489     return NS_ERROR_UNEXPECTED;
 490   }
 491
 492   nsresult SynthesizeNativeMouseEvent(LayoutDeviceIntPoint aPoint,
 493                                       NativeMouseMessage aNativeMessage,
 494                                       mozilla::MouseButton aButton,
 495                                       nsIWidget::Modifiers aModifierFlags,
 496                                       nsIObserver* aObserver) override {
 497     mozilla::widget::AutoObserverNotifier notifier(aObserver, "mouseevent");
 498     return NS_ERROR_UNEXPECTED;
 499   }
 500
 501   nsresult SynthesizeNativeMouseMove(LayoutDeviceIntPoint aPoint,
 502                                      nsIObserver* aObserver) override {
 503     mozilla::widget::AutoObserverNotifier notifier(aObserver, "mouseevent");
 504     return NS_ERROR_UNEXPECTED;
 505   }
 506
 507   nsresult SynthesizeNativeMouseScrollEvent(
 508       LayoutDeviceIntPoint aPoint, uint32_t aNativeMessage, double aDeltaX,
 509       double aDeltaY, double aDeltaZ, uint32_t aModifierFlags,
 510       uint32_t aAdditionalFlags, nsIObserver* aObserver) override {
 511     mozilla::widget::AutoObserverNotifier notifier(aObserver,
 512                                                    "mousescrollevent");
 513     return NS_ERROR_UNEXPECTED;
 514   }
 515
 516   nsresult SynthesizeNativeTouchPoint(uint32_t aPointerId,
 517                                       TouchPointerState aPointerState,
 518                                       LayoutDeviceIntPoint aPoint,
 519                                       double aPointerPressure,
 520                                       uint32_t aPointerOrientation,
 521                                       nsIObserver* aObserver) override {
 522     mozilla::widget::AutoObserverNotifier notifier(aObserver, "touchpoint");
 523     return NS_ERROR_UNEXPECTED;
 524   }
 525
 526   nsresult SynthesizeNativeTouchPadPinch(TouchpadGesturePhase aEventPhase,
 527                                          float aScale,
 528                                          LayoutDeviceIntPoint aPoint,
 529                                          int32_t aModifierFlags) override {
 530     MOZ_RELEASE_ASSERT(
 531         false, "This method is not implemented on the current platform");
 532     return NS_ERROR_UNEXPECTED;
 533   }
 534
 535   nsresult SynthesizeNativePenInput(uint32_t aPointerId,
 536                                     TouchPointerState aPointerState,
 537                                     LayoutDeviceIntPoint aPoint,
 538                                     double aPressure, uint32_t aRotation,
 539                                     int32_t aTiltX, int32_t aTiltY,
 540                                     int32_t aButton,
 541                                     nsIObserver* aObserver) override {
 542     MOZ_RELEASE_ASSERT(
 543         false, "This method is not implemented on the current platform");
 544     return NS_ERROR_UNEXPECTED;
 545   }
 546
 547   nsresult SynthesizeNativeTouchpadDoubleTap(LayoutDeviceIntPoint aPoint,
 548                                              uint32_t aModifierFlags) override {
 549     MOZ_RELEASE_ASSERT(
 550         false, "This method is not implemented on the current platform");
 551     return NS_ERROR_UNEXPECTED;
 552   }
 553
 554   nsresult SynthesizeNativeTouchpadPan(TouchpadGesturePhase aEventPhase,
 555                                        LayoutDeviceIntPoint aPoint,
 556                                        double aDeltaX, double aDeltaY,
 557                                        int32_t aModifierFlags,
 558                                        nsIObserver* aObserver) override {
 559     MOZ_RELEASE_ASSERT(
 560         false, "This method is not implemented on the current platform");
 561     return NS_ERROR_UNEXPECTED;
 562   }
 563
 564   /**
 565    * GetPseudoIMEContext() returns pseudo IME context when TextEventDispatcher
 566    * has non-native input transaction.  Otherwise, returns nullptr.
 567    */
 568   void* GetPseudoIMEContext();
 569
 570  protected:
 571   virtual already_AddRefed<nsIWidget> AllocateChildPopupWidget() {
 572     return nsIWidget::CreateChildWindow();
 573   }
 574
 575   WindowRenderer* CreateFallbackRenderer();
 576
 577   PopupType GetPopupType() const { return mPopupType; }
 578
 579   bool HasRemoteContent() const { return mHasRemoteContent; }
 580
 581   /**
 582    * Apply the current size constraints to the given size.
 583    *
 584    * @param aWidth width to constrain
 585    * @param aHeight height to constrain
 586    */
 587   void ConstrainSize(int32_t* aWidth, int32_t* aHeight) override {
 588     SizeConstraints c = GetSizeConstraints();
 589     *aWidth = std::max(c.mMinSize.width, std::min(c.mMaxSize.width, *aWidth));
 590     *aHeight =
 591         std::max(c.mMinSize.height, std::min(c.mMaxSize.height, *aHeight));
 592   }
 593
 594   CompositorBridgeChild* GetRemoteRenderer() override;
 595
 596   void ClearCachedWebrenderResources() override;
 597
 598   void ClearWebrenderAnimationResources() override;
 599
 600   bool SetNeedFastSnaphot() override;
 601
 602   /**
 603    * Notify the widget that this window is being used with OMTC.
 604    */
 605   virtual void WindowUsesOMTC() {}
 606   virtual void RegisterTouchWindow() {}
 607
 608   mozilla::dom::Document* GetDocument() const;
 609
 610   void EnsureTextEventDispatcher();
 611
 612   // Notify the compositor that a device reset has occurred.
 613   void OnRenderingDeviceReset();
 614
 615   bool UseAPZ();
 616
 617   bool AllowWebRenderForThisWindow();
 618
 619   /**
 620    * For widgets that support synthesizing native touch events, this function
 621    * can be used to manage the current state of synthetic pointers. Each widget
 622    * must maintain its own MultiTouchInput instance and pass it in as the state,
 623    * along with the desired parameters for the changes. This function returns
 624    * a new MultiTouchInput object that is ready to be dispatched.
 625    */
 626   mozilla::MultiTouchInput UpdateSynthesizedTouchState(
 627       mozilla::MultiTouchInput* aState, mozilla::TimeStamp aTimeStamp,
 628       uint32_t aPointerId, TouchPointerState aPointerState,
 629       LayoutDeviceIntPoint aPoint, double aPointerPressure,
 630       uint32_t aPointerOrientation);
 631
 632   /**
 633    * Dispatch the given MultiTouchInput through APZ to Gecko (if APZ is enabled)
 634    * or directly to gecko (if APZ is not enabled). This function must only
 635    * be called from the main thread, and if APZ is enabled, that must also be
 636    * the APZ controller thread.
 637    */
 638   void DispatchTouchInput(
 639       mozilla::MultiTouchInput& aInput,
 640       uint16_t aInputSource =
 641           mozilla::dom::MouseEvent_Binding::MOZ_SOURCE_TOUCH);
 642
 643   /**
 644    * Dispatch the given PanGestureInput through APZ to Gecko (if APZ is enabled)
 645    * or directly to gecko (if APZ is not enabled). This function must only
 646    * be called from the main thread, and if APZ is enabled, that must also be
 647    * the APZ controller thread.
 648    */
 649   void DispatchPanGestureInput(mozilla::PanGestureInput& aInput);
 650   void DispatchPinchGestureInput(mozilla::PinchGestureInput& aInput);
 651
 652   static bool ConvertStatus(nsEventStatus aStatus) {
 653     return aStatus == nsEventStatus_eConsumeNoDefault;
 654   }
 655
 656  protected:
 657   // Returns whether compositing should use an external surface size.
 658   virtual bool UseExternalCompositingSurface() const { return false; }
 659
 660   /**
 661    * Starts the OMTC compositor destruction sequence.
 662    *
 663    * When this function returns, the compositor should not be
 664    * able to access the opengl context anymore.
 665    * It is safe to call it several times if platform implementations
 666    * require the compositor to be destroyed before ~nsBaseWidget is
 667    * reached (This is the case with gtk2 for instance).
 668    */
 669   virtual void DestroyCompositor();
 670   void DestroyLayerManager();
 671   void ReleaseContentController();
 672   void RevokeTransactionIdAllocator();
 673
 674   void FreeShutdownObserver();
 675   void FreeLocalesChangedObserver();
 676
 677   bool IsPIPWindow() const { return mIsPIPWindow; };
 678
 679   nsIWidgetListener* mWidgetListener;
 680   nsIWidgetListener* mAttachedWidgetListener;
 681   nsIWidgetListener* mPreviouslyAttachedWidgetListener;
 682   RefPtr<WindowRenderer> mWindowRenderer;
 683   RefPtr<CompositorSession> mCompositorSession;
 684   RefPtr<CompositorBridgeChild> mCompositorBridgeChild;
 685
 686   mozilla::UniquePtr<mozilla::Mutex> mCompositorVsyncDispatcherLock;
 687   RefPtr<mozilla::CompositorVsyncDispatcher> mCompositorVsyncDispatcher;
 688
 689   RefPtr<IAPZCTreeManager> mAPZC;
 690   RefPtr<GeckoContentController> mRootContentController;
 691   RefPtr<APZEventState> mAPZEventState;
 692   RefPtr<WidgetShutdownObserver> mShutdownObserver;
 693   RefPtr<LocalesChangedObserver> mLocalesChangedObserver;
 694   RefPtr<TextEventDispatcher> mTextEventDispatcher;
 695   RefPtr<mozilla::SwipeTracker> mSwipeTracker;
 696   mozilla::UniquePtr<mozilla::SwipeEventQueue> mSwipeEventQueue;
 697   Cursor mCursor;
 698   BorderStyle mBorderStyle;
 699   LayoutDeviceIntRect mBounds;
 700   bool mIsTiled;
 701   PopupLevel mPopupLevel;
 702   PopupType mPopupType;
 703   SizeConstraints mSizeConstraints;
 704   bool mHasRemoteContent;
 705
 706   struct FullscreenSavedState {
 707     DesktopRect windowRect;
 708     DesktopRect screenRect;
 709   };
 710   mozilla::Maybe<FullscreenSavedState> mSavedBounds;
 711
 712   bool mUpdateCursor;
 713   bool mUseAttachedEvents;
 714   bool mIMEHasFocus;
 715   bool mIMEHasQuit;
 716   bool mIsFullyOccluded;
 717   bool mNeedFastSnaphot;
 718   // This flag is only used when APZ is off. It indicates that the current pan
 719   // gesture was processed as a swipe. Sometimes the swipe animation can finish
 720   // before momentum events of the pan gesture have stopped firing, so this
 721   // flag tells us that we shouldn't allow the remaining events to cause
 722   // scrolling. It is reset to false once a new gesture starts (as indicated by
 723   // a PANGESTURE_(MAY)START event).
 724   bool mCurrentPanGestureBelongsToSwipe;
 725
 726   // It's PictureInPicture window.
 727   bool mIsPIPWindow : 1;
 728
 729   struct InitialZoomConstraints {
 730     InitialZoomConstraints(const uint32_t& aPresShellID,
 731                            const ScrollableLayerGuid::ViewID& aViewID,
 732                            const ZoomConstraints& aConstraints)
 733         : mPresShellID(aPresShellID),
 734           mViewID(aViewID),
 735           mConstraints(aConstraints) {}
 736
 737     uint32_t mPresShellID;
 738     ScrollableLayerGuid::ViewID mViewID;
 739     ZoomConstraints mConstraints;
 740   };
 741
 742   mozilla::Maybe<InitialZoomConstraints> mInitialZoomConstraints;
 743
 744   // This points to the resize listeners who have been notified that a live
 745   // resize is in progress. This should always be empty when a live-resize is
 746   // not in progress.
 747   nsTArray<RefPtr<mozilla::LiveResizeListener>> mLiveResizeListeners;
 748
 749 #ifdef DEBUG
 750  protected:
 751   static nsAutoString debug_GuiEventToString(
 752       mozilla::WidgetGUIEvent* aGuiEvent);
 753
 754   static void debug_DumpInvalidate(FILE* aFileOut, nsIWidget* aWidget,
 755                                    const LayoutDeviceIntRect* aRect,
 756                                    const char* aWidgetName, int32_t aWindowID);
 757
 758   static void debug_DumpEvent(FILE* aFileOut, nsIWidget* aWidget,
 759                               mozilla::WidgetGUIEvent* aGuiEvent,
 760                               const char* aWidgetName, int32_t aWindowID);
 761
 762   static void debug_DumpPaintEvent(FILE* aFileOut, nsIWidget* aWidget,
 763                                    const nsIntRegion& aPaintEvent,
 764                                    const char* aWidgetName, int32_t aWindowID);
 765
 766   static bool debug_GetCachedBoolPref(const char* aPrefName);
 767 #endif
 768
 769  private:
 770   already_AddRefed<mozilla::layers::WebRenderLayerManager>
 771   CreateCompositorSession(int aWidth, int aHeight,
 772                           mozilla::layers::CompositorOptions* aOptionsOut);
 773 };
 774
 775 #endif  // nsBaseWidget_h__