зеркало из https://github.com/mozilla/gecko-dev.git
525 строки
23 KiB
C++
525 строки
23 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsBaseWidget_h__
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#define nsBaseWidget_h__
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#include "mozilla/EventForwards.h"
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#include "mozilla/WidgetUtils.h"
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#include "nsRect.h"
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#include "nsIWidget.h"
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#include "nsWidgetsCID.h"
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#include "nsIFile.h"
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#include "nsString.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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#include "nsIRollupListener.h"
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#include "nsIObserver.h"
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#include "nsIWidgetListener.h"
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#include "nsPIDOMWindow.h"
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#include <algorithm>
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class nsIContent;
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class nsAutoRollup;
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class gfxContext;
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namespace mozilla {
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#ifdef ACCESSIBILITY
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namespace a11y {
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class Accessible;
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}
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#endif
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namespace layers {
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class BasicLayerManager;
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class CompositorChild;
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class CompositorParent;
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class APZCTreeManager;
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class GeckoContentController;
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class APZEventState;
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struct ScrollableLayerGuid;
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struct SetTargetAPZCCallback;
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}
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class CompositorVsyncDispatcher;
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}
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namespace base {
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class Thread;
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}
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// Windows specific constant indicating the maximum number of touch points the
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// inject api will allow. This also sets the maximum numerical value for touch
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// ids we can use when injecting touch points on Windows.
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#define TOUCH_INJECT_MAX_POINTS 256
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class nsBaseWidget;
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class WidgetShutdownObserver MOZ_FINAL : public nsIObserver
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{
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~WidgetShutdownObserver() {}
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public:
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explicit WidgetShutdownObserver(nsBaseWidget* aWidget)
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: mWidget(aWidget)
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{ }
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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nsBaseWidget *mWidget;
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};
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/**
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* Common widget implementation used as base class for native
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* or crossplatform implementations of Widgets.
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* All cross-platform behavior that all widgets need to implement
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* should be placed in this class.
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* (Note: widget implementations are not required to use this
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* class, but it gives them a head start.)
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*/
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class nsBaseWidget : public nsIWidget
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{
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friend class nsAutoRollup;
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protected:
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typedef base::Thread Thread;
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typedef mozilla::layers::BasicLayerManager BasicLayerManager;
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typedef mozilla::layers::BufferMode BufferMode;
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typedef mozilla::layers::CompositorChild CompositorChild;
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typedef mozilla::layers::CompositorParent CompositorParent;
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typedef mozilla::layers::APZCTreeManager APZCTreeManager;
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typedef mozilla::layers::GeckoContentController GeckoContentController;
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typedef mozilla::layers::ScrollableLayerGuid ScrollableLayerGuid;
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typedef mozilla::layers::APZEventState APZEventState;
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typedef mozilla::layers::SetTargetAPZCCallback SetTargetAPZCCallback;
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typedef mozilla::ScreenRotation ScreenRotation;
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virtual ~nsBaseWidget();
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public:
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nsBaseWidget();
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NS_DECL_ISUPPORTS
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// nsIWidget interface
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NS_IMETHOD CaptureMouse(bool aCapture) MOZ_OVERRIDE;
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virtual nsIWidgetListener* GetWidgetListener() MOZ_OVERRIDE;
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virtual void SetWidgetListener(nsIWidgetListener* alistener) MOZ_OVERRIDE;
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NS_IMETHOD Destroy() MOZ_OVERRIDE;
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NS_IMETHOD SetParent(nsIWidget* aNewParent) MOZ_OVERRIDE;
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virtual nsIWidget* GetParent(void) MOZ_OVERRIDE;
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virtual nsIWidget* GetTopLevelWidget() MOZ_OVERRIDE;
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virtual nsIWidget* GetSheetWindowParent(void) MOZ_OVERRIDE;
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virtual float GetDPI() MOZ_OVERRIDE;
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virtual void AddChild(nsIWidget* aChild) MOZ_OVERRIDE;
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virtual void RemoveChild(nsIWidget* aChild) MOZ_OVERRIDE;
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void SetZIndex(int32_t aZIndex) MOZ_OVERRIDE;
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NS_IMETHOD PlaceBehind(nsTopLevelWidgetZPlacement aPlacement,
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nsIWidget *aWidget, bool aActivate) MOZ_OVERRIDE;
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NS_IMETHOD SetSizeMode(int32_t aMode) MOZ_OVERRIDE;
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virtual int32_t SizeMode() MOZ_OVERRIDE
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{
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return mSizeMode;
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}
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virtual nsCursor GetCursor() MOZ_OVERRIDE;
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NS_IMETHOD SetCursor(nsCursor aCursor) MOZ_OVERRIDE;
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NS_IMETHOD SetCursor(imgIContainer* aCursor,
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uint32_t aHotspotX, uint32_t aHotspotY) MOZ_OVERRIDE;
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virtual void ClearCachedCursor() MOZ_OVERRIDE { mUpdateCursor = true; }
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virtual void SetTransparencyMode(nsTransparencyMode aMode) MOZ_OVERRIDE;
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virtual nsTransparencyMode GetTransparencyMode() MOZ_OVERRIDE;
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virtual void GetWindowClipRegion(nsTArray<nsIntRect>* aRects) MOZ_OVERRIDE;
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NS_IMETHOD SetWindowShadowStyle(int32_t aStyle) MOZ_OVERRIDE;
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virtual void SetShowsToolbarButton(bool aShow) MOZ_OVERRIDE {}
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virtual void SetShowsFullScreenButton(bool aShow) MOZ_OVERRIDE {}
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virtual void SetWindowAnimationType(WindowAnimationType aType) MOZ_OVERRIDE {}
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NS_IMETHOD HideWindowChrome(bool aShouldHide) MOZ_OVERRIDE;
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NS_IMETHOD MakeFullScreen(bool aFullScreen, nsIScreen* aScreen = nullptr) MOZ_OVERRIDE;
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virtual LayerManager* GetLayerManager(PLayerTransactionChild* aShadowManager = nullptr,
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LayersBackend aBackendHint = mozilla::layers::LayersBackend::LAYERS_NONE,
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LayerManagerPersistence aPersistence = LAYER_MANAGER_CURRENT,
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bool* aAllowRetaining = nullptr) MOZ_OVERRIDE;
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CompositorVsyncDispatcher* GetCompositorVsyncDispatcher() MOZ_OVERRIDE;
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void CreateCompositorVsyncDispatcher();
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virtual CompositorParent* NewCompositorParent(int aSurfaceWidth, int aSurfaceHeight);
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virtual void CreateCompositor();
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virtual void CreateCompositor(int aWidth, int aHeight);
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virtual void PrepareWindowEffects() MOZ_OVERRIDE {}
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virtual void CleanupWindowEffects() MOZ_OVERRIDE {}
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virtual bool PreRender(LayerManagerComposite* aManager) MOZ_OVERRIDE { return true; }
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virtual void PostRender(LayerManagerComposite* aManager) MOZ_OVERRIDE {}
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virtual void DrawWindowUnderlay(LayerManagerComposite* aManager, nsIntRect aRect) MOZ_OVERRIDE {}
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virtual void DrawWindowOverlay(LayerManagerComposite* aManager, nsIntRect aRect) MOZ_OVERRIDE {}
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virtual mozilla::TemporaryRef<mozilla::gfx::DrawTarget> StartRemoteDrawing() MOZ_OVERRIDE;
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virtual void EndRemoteDrawing() MOZ_OVERRIDE { };
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virtual void CleanupRemoteDrawing() MOZ_OVERRIDE { };
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virtual void UpdateThemeGeometries(const nsTArray<ThemeGeometry>& aThemeGeometries) MOZ_OVERRIDE {}
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NS_IMETHOD SetModal(bool aModal) MOZ_OVERRIDE;
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virtual uint32_t GetMaxTouchPoints() const MOZ_OVERRIDE;
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NS_IMETHOD SetWindowClass(const nsAString& xulWinType) MOZ_OVERRIDE;
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virtual nsresult SetWindowClipRegion(const nsTArray<nsIntRect>& aRects, bool aIntersectWithExisting) MOZ_OVERRIDE;
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// Return whether this widget interprets parameters to Move and Resize APIs
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// as "global display pixels" rather than "device pixels", and therefore
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// applies its GetDefaultScale() value to them before using them as mBounds
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// etc (which are always stored in device pixels).
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// Note that APIs that -get- the widget's position/size/bounds, rather than
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// -setting- them (i.e. moving or resizing the widget) will always return
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// values in the widget's device pixels.
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bool BoundsUseDisplayPixels() const {
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return mWindowType <= eWindowType_popup;
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}
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NS_IMETHOD MoveClient(double aX, double aY) MOZ_OVERRIDE;
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NS_IMETHOD ResizeClient(double aWidth, double aHeight, bool aRepaint) MOZ_OVERRIDE;
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NS_IMETHOD ResizeClient(double aX, double aY, double aWidth, double aHeight, bool aRepaint) MOZ_OVERRIDE;
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NS_IMETHOD GetBounds(nsIntRect &aRect) MOZ_OVERRIDE;
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NS_IMETHOD GetClientBounds(nsIntRect &aRect) MOZ_OVERRIDE;
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NS_IMETHOD GetScreenBounds(nsIntRect &aRect) MOZ_OVERRIDE;
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NS_IMETHOD GetRestoredBounds(nsIntRect &aRect) MOZ_OVERRIDE;
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NS_IMETHOD GetNonClientMargins(nsIntMargin &margins) MOZ_OVERRIDE;
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NS_IMETHOD SetNonClientMargins(nsIntMargin &margins) MOZ_OVERRIDE;
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virtual nsIntPoint GetClientOffset() MOZ_OVERRIDE;
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NS_IMETHOD EnableDragDrop(bool aEnable) MOZ_OVERRIDE;
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NS_IMETHOD GetAttention(int32_t aCycleCount) MOZ_OVERRIDE;
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virtual bool HasPendingInputEvent() MOZ_OVERRIDE;
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NS_IMETHOD SetIcon(const nsAString &anIconSpec) MOZ_OVERRIDE;
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NS_IMETHOD SetWindowTitlebarColor(nscolor aColor, bool aActive) MOZ_OVERRIDE;
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virtual void SetDrawsInTitlebar(bool aState) MOZ_OVERRIDE {}
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virtual bool ShowsResizeIndicator(nsIntRect* aResizerRect) MOZ_OVERRIDE;
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virtual void FreeNativeData(void * data, uint32_t aDataType) MOZ_OVERRIDE {}
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NS_IMETHOD BeginResizeDrag(mozilla::WidgetGUIEvent* aEvent,
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int32_t aHorizontal,
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int32_t aVertical) MOZ_OVERRIDE;
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NS_IMETHOD BeginMoveDrag(mozilla::WidgetMouseEvent* aEvent) MOZ_OVERRIDE;
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virtual nsresult ActivateNativeMenuItemAt(const nsAString& indexString) MOZ_OVERRIDE { return NS_ERROR_NOT_IMPLEMENTED; }
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virtual nsresult ForceUpdateNativeMenuAt(const nsAString& indexString) MOZ_OVERRIDE { return NS_ERROR_NOT_IMPLEMENTED; }
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NS_IMETHOD NotifyIME(const IMENotification& aIMENotification) MOZ_OVERRIDE MOZ_FINAL;
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NS_IMETHOD AttachNativeKeyEvent(mozilla::WidgetKeyboardEvent& aEvent) MOZ_OVERRIDE { return NS_ERROR_NOT_IMPLEMENTED; }
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NS_IMETHOD_(bool) ExecuteNativeKeyBinding(
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NativeKeyBindingsType aType,
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const mozilla::WidgetKeyboardEvent& aEvent,
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DoCommandCallback aCallback,
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void* aCallbackData) MOZ_OVERRIDE { return false; }
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NS_IMETHOD SetLayersAcceleration(bool aEnabled) MOZ_OVERRIDE;
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virtual bool ComputeShouldAccelerate(bool aDefault);
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NS_IMETHOD GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState) MOZ_OVERRIDE { return NS_ERROR_NOT_IMPLEMENTED; }
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virtual nsIMEUpdatePreference GetIMEUpdatePreference() MOZ_OVERRIDE { return nsIMEUpdatePreference(); }
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NS_IMETHOD OnDefaultButtonLoaded(const nsIntRect &aButtonRect) MOZ_OVERRIDE { return NS_ERROR_NOT_IMPLEMENTED; }
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NS_IMETHOD OverrideSystemMouseScrollSpeed(double aOriginalDeltaX,
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double aOriginalDeltaY,
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double& aOverriddenDeltaX,
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double& aOverriddenDeltaY) MOZ_OVERRIDE;
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virtual already_AddRefed<nsIWidget>
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CreateChild(const nsIntRect &aRect,
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nsWidgetInitData *aInitData = nullptr,
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bool aForceUseIWidgetParent = false) MOZ_OVERRIDE;
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NS_IMETHOD AttachViewToTopLevel(bool aUseAttachedEvents) MOZ_OVERRIDE;
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virtual nsIWidgetListener* GetAttachedWidgetListener() MOZ_OVERRIDE;
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virtual void SetAttachedWidgetListener(nsIWidgetListener* aListener) MOZ_OVERRIDE;
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NS_IMETHOD RegisterTouchWindow() MOZ_OVERRIDE;
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NS_IMETHOD UnregisterTouchWindow() MOZ_OVERRIDE;
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NS_IMETHOD_(TextEventDispatcher*) GetTextEventDispatcher() MOZ_OVERRIDE MOZ_FINAL;
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void NotifyWindowDestroyed();
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void NotifySizeMoveDone();
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void NotifyWindowMoved(int32_t aX, int32_t aY);
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// Register plugin windows for remote updates from the compositor
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virtual void RegisterPluginWindowForRemoteUpdates() MOZ_OVERRIDE;
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virtual void UnregisterPluginWindowForRemoteUpdates() MOZ_OVERRIDE;
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virtual void SetNativeData(uint32_t aDataType, uintptr_t aVal) MOZ_OVERRIDE {};
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// Should be called by derived implementations to notify on system color and
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// theme changes.
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void NotifySysColorChanged();
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void NotifyThemeChanged();
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void NotifyUIStateChanged(UIStateChangeType aShowAccelerators,
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UIStateChangeType aShowFocusRings);
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#ifdef ACCESSIBILITY
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// Get the accessible for the window.
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mozilla::a11y::Accessible* GetRootAccessible();
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#endif
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nsPopupLevel PopupLevel() { return mPopupLevel; }
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virtual nsIntSize ClientToWindowSize(const nsIntSize& aClientSize) MOZ_OVERRIDE
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{
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return aClientSize;
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}
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// return true if this is a popup widget with a native titlebar
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bool IsPopupWithTitleBar() const
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{
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return (mWindowType == eWindowType_popup &&
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mBorderStyle != eBorderStyle_default &&
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mBorderStyle & eBorderStyle_title);
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}
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NS_IMETHOD ReparentNativeWidget(nsIWidget* aNewParent) MOZ_OVERRIDE = 0;
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virtual uint32_t GetGLFrameBufferFormat() MOZ_OVERRIDE;
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virtual const SizeConstraints& GetSizeConstraints() const MOZ_OVERRIDE;
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virtual void SetSizeConstraints(const SizeConstraints& aConstraints) MOZ_OVERRIDE;
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/**
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* Use this when GetLayerManager() returns a BasicLayerManager
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* (nsBaseWidget::GetLayerManager() does). This sets up the widget's
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* layer manager to temporarily render into aTarget.
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*
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* |aNaturalWidgetBounds| is the un-rotated bounds of |aWidget|.
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* |aRotation| is the "virtual rotation" to apply when rendering to
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* the target. When |aRotation| is ROTATION_0,
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* |aNaturalWidgetBounds| is not used.
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*/
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class AutoLayerManagerSetup {
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public:
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AutoLayerManagerSetup(nsBaseWidget* aWidget, gfxContext* aTarget,
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BufferMode aDoubleBuffering,
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ScreenRotation aRotation = mozilla::ROTATION_0);
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~AutoLayerManagerSetup();
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private:
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nsBaseWidget* mWidget;
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nsRefPtr<BasicLayerManager> mLayerManager;
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};
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friend class AutoLayerManagerSetup;
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class AutoUseBasicLayerManager {
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public:
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explicit AutoUseBasicLayerManager(nsBaseWidget* aWidget);
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~AutoUseBasicLayerManager();
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private:
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nsBaseWidget* mWidget;
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bool mPreviousTemporarilyUseBasicLayerManager;
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};
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friend class AutoUseBasicLayerManager;
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virtual bool ShouldUseOffMainThreadCompositing();
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static nsIRollupListener* GetActiveRollupListener();
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void Shutdown();
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protected:
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void ResolveIconName(const nsAString &aIconName,
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const nsAString &aIconSuffix,
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nsIFile **aResult);
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virtual void OnDestroy();
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void BaseCreate(nsIWidget *aParent,
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const nsIntRect &aRect,
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nsWidgetInitData *aInitData);
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virtual void ConfigureAPZCTreeManager();
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virtual already_AddRefed<GeckoContentController> CreateRootContentController();
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// Dispatch an event that has been routed through APZ directly from the
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// widget.
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nsEventStatus DispatchEventForAPZ(mozilla::WidgetGUIEvent* aEvent,
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const ScrollableLayerGuid& aGuid,
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uint64_t aInputBlockId);
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const nsIntRegion RegionFromArray(const nsTArray<nsIntRect>& aRects);
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void ArrayFromRegion(const nsIntRegion& aRegion, nsTArray<nsIntRect>& aRects);
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virtual nsIContent* GetLastRollup() MOZ_OVERRIDE
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{
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return mLastRollup;
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}
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virtual nsresult SynthesizeNativeKeyEvent(int32_t aNativeKeyboardLayout,
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int32_t aNativeKeyCode,
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uint32_t aModifierFlags,
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const nsAString& aCharacters,
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const nsAString& aUnmodifiedCharacters) MOZ_OVERRIDE
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{ return NS_ERROR_UNEXPECTED; }
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virtual nsresult SynthesizeNativeMouseEvent(mozilla::LayoutDeviceIntPoint aPoint,
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uint32_t aNativeMessage,
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uint32_t aModifierFlags) MOZ_OVERRIDE
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{ return NS_ERROR_UNEXPECTED; }
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virtual nsresult SynthesizeNativeMouseMove(mozilla::LayoutDeviceIntPoint aPoint) MOZ_OVERRIDE
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{ return NS_ERROR_UNEXPECTED; }
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virtual nsresult SynthesizeNativeMouseScrollEvent(mozilla::LayoutDeviceIntPoint aPoint,
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uint32_t aNativeMessage,
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double aDeltaX,
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double aDeltaY,
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double aDeltaZ,
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uint32_t aModifierFlags,
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uint32_t aAdditionalFlags) MOZ_OVERRIDE
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{ return NS_ERROR_UNEXPECTED; }
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virtual nsresult SynthesizeNativeTouchPoint(uint32_t aPointerId,
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TouchPointerState aPointerState,
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nsIntPoint aPointerScreenPoint,
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double aPointerPressure,
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uint32_t aPointerOrientation) MOZ_OVERRIDE
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{ return NS_ERROR_UNEXPECTED; }
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virtual nsresult NotifyIMEInternal(const IMENotification& aIMENotification)
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{ return NS_ERROR_NOT_IMPLEMENTED; }
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protected:
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// Utility to check if an array of clip rects is equal to our
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// internally stored clip rect array mClipRects.
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bool IsWindowClipRegionEqual(const nsTArray<nsIntRect>& aRects);
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// Stores the clip rectangles in aRects into mClipRects.
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void StoreWindowClipRegion(const nsTArray<nsIntRect>& aRects);
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virtual already_AddRefed<nsIWidget>
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AllocateChildPopupWidget()
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{
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static NS_DEFINE_IID(kCPopUpCID, NS_CHILD_CID);
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nsCOMPtr<nsIWidget> widget = do_CreateInstance(kCPopUpCID);
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return widget.forget();
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}
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LayerManager* CreateBasicLayerManager();
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nsPopupType PopupType() const { return mPopupType; }
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void NotifyRollupGeometryChange()
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{
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// XULPopupManager isn't interested in this notification, so only
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// send it if gRollupListener is set.
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if (gRollupListener) {
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gRollupListener->NotifyGeometryChange();
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}
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}
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/**
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* Apply the current size constraints to the given size.
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*
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* @param aWidth width to constrain
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* @param aHeight height to constrain
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*/
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void ConstrainSize(int32_t* aWidth, int32_t* aHeight) const
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{
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*aWidth = std::max(mSizeConstraints.mMinSize.width,
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std::min(mSizeConstraints.mMaxSize.width, *aWidth));
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*aHeight = std::max(mSizeConstraints.mMinSize.height,
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std::min(mSizeConstraints.mMaxSize.height, *aHeight));
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}
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virtual CompositorChild* GetRemoteRenderer() MOZ_OVERRIDE;
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virtual void GetPreferredCompositorBackends(nsTArray<mozilla::layers::LayersBackend>& aHints);
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/**
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* Notify the widget that this window is being used with OMTC.
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*/
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virtual void WindowUsesOMTC() {}
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nsIDocument* GetDocument() const;
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protected:
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/**
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* Starts the OMTC compositor destruction sequence.
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*
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* When this function returns, the compositor should not be
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* able to access the opengl context anymore.
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* It is safe to call it several times if platform implementations
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* require the compositor to be destroyed before ~nsBaseWidget is
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* reached (This is the case with gtk2 for instance).
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*/
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void DestroyCompositor();
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nsIWidgetListener* mWidgetListener;
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nsIWidgetListener* mAttachedWidgetListener;
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nsRefPtr<LayerManager> mLayerManager;
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nsRefPtr<LayerManager> mBasicLayerManager;
|
|
nsRefPtr<CompositorChild> mCompositorChild;
|
|
nsRefPtr<CompositorParent> mCompositorParent;
|
|
nsRefPtr<mozilla::CompositorVsyncDispatcher> mCompositorVsyncDispatcher;
|
|
nsRefPtr<APZCTreeManager> mAPZC;
|
|
nsRefPtr<APZEventState> mAPZEventState;
|
|
nsRefPtr<SetTargetAPZCCallback> mSetTargetAPZCCallback;
|
|
nsRefPtr<WidgetShutdownObserver> mShutdownObserver;
|
|
nsRefPtr<TextEventDispatcher> mTextEventDispatcher;
|
|
nsCursor mCursor;
|
|
bool mUpdateCursor;
|
|
nsBorderStyle mBorderStyle;
|
|
bool mUseLayersAcceleration;
|
|
bool mForceLayersAcceleration;
|
|
bool mTemporarilyUseBasicLayerManager;
|
|
// Windows with out-of-process tabs always require OMTC. This flag designates
|
|
// such windows.
|
|
bool mRequireOffMainThreadCompositing;
|
|
bool mUseAttachedEvents;
|
|
nsIntRect mBounds;
|
|
nsIntRect* mOriginalBounds;
|
|
// When this pointer is null, the widget is not clipped
|
|
nsAutoArrayPtr<nsIntRect> mClipRects;
|
|
uint32_t mClipRectCount;
|
|
nsSizeMode mSizeMode;
|
|
nsPopupLevel mPopupLevel;
|
|
nsPopupType mPopupType;
|
|
SizeConstraints mSizeConstraints;
|
|
|
|
static nsIRollupListener* gRollupListener;
|
|
|
|
// the last rolled up popup. Only set this when an nsAutoRollup is in scope,
|
|
// so it can be cleared automatically.
|
|
static nsIContent* mLastRollup;
|
|
|
|
#ifdef DEBUG
|
|
protected:
|
|
static nsAutoString debug_GuiEventToString(mozilla::WidgetGUIEvent* aGuiEvent);
|
|
static bool debug_WantPaintFlashing();
|
|
|
|
static void debug_DumpInvalidate(FILE * aFileOut,
|
|
nsIWidget * aWidget,
|
|
const nsIntRect * aRect,
|
|
const nsAutoCString & aWidgetName,
|
|
int32_t aWindowID);
|
|
|
|
static void debug_DumpEvent(FILE* aFileOut,
|
|
nsIWidget* aWidget,
|
|
mozilla::WidgetGUIEvent* aGuiEvent,
|
|
const nsAutoCString& aWidgetName,
|
|
int32_t aWindowID);
|
|
|
|
static void debug_DumpPaintEvent(FILE * aFileOut,
|
|
nsIWidget * aWidget,
|
|
const nsIntRegion & aPaintEvent,
|
|
const nsAutoCString & aWidgetName,
|
|
int32_t aWindowID);
|
|
|
|
static bool debug_GetCachedBoolPref(const char* aPrefName);
|
|
#endif
|
|
};
|
|
|
|
// A situation can occur when a mouse event occurs over a menu label while the
|
|
// menu popup is already open. The expected behaviour is to close the popup.
|
|
// This happens by calling nsIRollupListener::Rollup before the mouse event is
|
|
// processed. However, in cases where the mouse event is not consumed, this
|
|
// event will then get targeted at the menu label causing the menu to open
|
|
// again. To prevent this, we store in mLastRollup a reference to the popup
|
|
// that was closed during the Rollup call, and prevent this popup from
|
|
// reopening while processing the mouse event.
|
|
// mLastRollup should only be set while an nsAutoRollup is in scope;
|
|
// when it goes out of scope mLastRollup is cleared automatically.
|
|
// As mLastRollup is static, it can be retrieved by calling
|
|
// nsIWidget::GetLastRollup on any widget.
|
|
class nsAutoRollup
|
|
{
|
|
bool wasClear;
|
|
|
|
public:
|
|
|
|
nsAutoRollup();
|
|
~nsAutoRollup();
|
|
};
|
|
|
|
#endif // nsBaseWidget_h__
|