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Diffstat (limited to 'dom/events/EventStateManager.h')
| -rw-r--r-- | dom/events/EventStateManager.h | 1256 |
1 files changed, 1256 insertions, 0 deletions
diff --git a/dom/events/EventStateManager.h b/dom/events/EventStateManager.h new file mode 100644 index 0000000000..7a43ade7a4 --- /dev/null +++ b/dom/events/EventStateManager.h @@ -0,0 +1,1256 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_EventStateManager_h_ +#define mozilla_EventStateManager_h_ + +#include "mozilla/EventForwards.h" + +#include "nsIObserver.h" +#include "nsWeakReference.h" +#include "nsCOMPtr.h" +#include "nsCOMArray.h" +#include "nsCycleCollectionParticipant.h" +#include "nsRefPtrHashtable.h" +#include "mozilla/Attributes.h" +#include "mozilla/TimeStamp.h" +#include "mozilla/layers/APZPublicUtils.h" +#include "mozilla/dom/Record.h" +#include "Units.h" +#include "WheelHandlingHelper.h" // for WheelDeltaAdjustmentStrategy + +class nsFrameLoader; +class nsIContent; +class nsICookieJarSettings; +class nsIDocShell; +class nsIDocShellTreeItem; +class nsIFrame; +class imgIContainer; +class nsIContentViewer; +class nsIScrollableFrame; +class nsITimer; +class nsPresContext; + +namespace mozilla { + +class EditorBase; +class EnterLeaveDispatcher; +class IMEContentObserver; +class ScrollbarsForWheel; +class TextControlElement; +class WheelTransaction; + +namespace dom { +class DataTransfer; +class Document; +class Element; +class Selection; +class BrowserParent; +class RemoteDragStartData; + +} // namespace dom + +class OverOutElementsWrapper final : public nsISupports { + ~OverOutElementsWrapper(); + + public: + OverOutElementsWrapper(); + + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_CYCLE_COLLECTION_CLASS(OverOutElementsWrapper) + + WeakFrame mLastOverFrame; + + nsCOMPtr<nsIContent> mLastOverElement; + + // The last element on which we fired a over event, or null if + // the last over event we fired has finished processing. + nsCOMPtr<nsIContent> mFirstOverEventElement; + + // The last element on which we fired a out event, or null if + // the last out event we fired has finished processing. + nsCOMPtr<nsIContent> mFirstOutEventElement; +}; + +class EventStateManager : public nsSupportsWeakReference, public nsIObserver { + friend class mozilla::EnterLeaveDispatcher; + friend class mozilla::ScrollbarsForWheel; + friend class mozilla::WheelTransaction; + + using ElementState = dom::ElementState; + + virtual ~EventStateManager(); + + public: + EventStateManager(); + + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_NSIOBSERVER + + nsresult Init(); + nsresult Shutdown(); + + /* The PreHandleEvent method is called before event dispatch to either + * the DOM or frames. Any processing which must not be prevented or + * cancelled should occur here. Any processing which is intended to + * be conditional based on either DOM or frame processing should occur in + * PostHandleEvent. Any centralized event processing which must occur before + * DOM or frame event handling should occur here as well. + * + * aOverrideClickTarget can be used to indicate which element should be + * used as the *up target when deciding whether to send click event. + * This is used when releasing pointer capture. Otherwise null. + */ + MOZ_CAN_RUN_SCRIPT + nsresult PreHandleEvent(nsPresContext* aPresContext, WidgetEvent* aEvent, + nsIFrame* aTargetFrame, nsIContent* aTargetContent, + nsEventStatus* aStatus, + nsIContent* aOverrideClickTarget); + + /* The PostHandleEvent method should contain all system processing which + * should occur conditionally based on DOM or frame processing. It should + * also contain any centralized event processing which must occur after + * DOM and frame processing. + */ + MOZ_CAN_RUN_SCRIPT + nsresult PostHandleEvent(nsPresContext* aPresContext, WidgetEvent* aEvent, + nsIFrame* aTargetFrame, nsEventStatus* aStatus, + nsIContent* aOverrideClickTarget); + + MOZ_CAN_RUN_SCRIPT void PostHandleKeyboardEvent( + WidgetKeyboardEvent* aKeyboardEvent, nsIFrame* aTargetFrame, + nsEventStatus& aStatus); + + /** + * DispatchLegacyMouseScrollEvents() dispatches eLegacyMouseLineOrPageScroll + * event and eLegacyMousePixelScroll event for compatibility with old Gecko. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY void DispatchLegacyMouseScrollEvents( + nsIFrame* aTargetFrame, WidgetWheelEvent* aEvent, nsEventStatus* aStatus); + + MOZ_CAN_RUN_SCRIPT_BOUNDARY void NotifyDestroyPresContext( + nsPresContext* aPresContext); + + void ResetHoverState(); + + void SetPresContext(nsPresContext* aPresContext); + void ClearFrameRefs(nsIFrame* aFrame); + + nsIFrame* GetEventTarget(); + already_AddRefed<nsIContent> GetEventTargetContent(WidgetEvent* aEvent); + + // We manage 4 states here: ACTIVE, HOVER, DRAGOVER, URLTARGET + static bool ManagesState(ElementState aState) { + return aState == ElementState::ACTIVE || aState == ElementState::HOVER || + aState == ElementState::DRAGOVER || + aState == ElementState::URLTARGET; + } + + /** + * Notify that the given ElementState::* bit has changed for this content. + * @param aContent Content which has changed states + * @param aState Corresponding state flags such as ElementState::FOCUS + * @return Whether the content was able to change all states. Returns false + * if a resulting DOM event causes the content node passed in + * to not change states. Note, the frame for the content may + * change as a result of the content state change, because of + * frame reconstructions that may occur, but this does not + * affect the return value. + */ + bool SetContentState(nsIContent* aContent, ElementState aState); + + nsIContent* GetActiveContent() const { return mActiveContent; } + + void NativeAnonymousContentRemoved(nsIContent* aAnonContent); + MOZ_CAN_RUN_SCRIPT_BOUNDARY void ContentRemoved(dom::Document* aDocument, + nsIContent* aContent); + + /** + * Called when a native anonymous <div> element which is root element of + * text editor will be removed. + */ + void TextControlRootWillBeRemoved(TextControlElement& aTextControlElement); + + /** + * Called when a native anonymous <div> element which is root element of + * text editor is created. + */ + void TextControlRootAdded(dom::Element& aAnonymousDivElement, + TextControlElement& aTextControlElement); + + bool EventStatusOK(WidgetGUIEvent* aEvent); + + /** + * EventStateManager stores IMEContentObserver while it's observing contents. + * Following mehtods are called by IMEContentObserver when it starts to + * observe or stops observing the content. + */ + void OnStartToObserveContent(IMEContentObserver* aIMEContentObserver); + void OnStopObservingContent(IMEContentObserver* aIMEContentObserver); + + /** + * TryToFlushPendingNotificationsToIME() suggests flushing pending + * notifications to IME to IMEContentObserver. + * Doesn't do anything in child processes where flushing happens + * asynchronously. + */ + void TryToFlushPendingNotificationsToIME(); + + static bool IsKeyboardEventUserActivity(WidgetEvent* aEvent); + + /** + * Register accesskey on the given element. When accesskey is activated then + * the element will be notified via Element::PerformAccesskey() method. + * + * @param aElement the given element + * @param aKey accesskey + */ + void RegisterAccessKey(dom::Element* aElement, uint32_t aKey); + + /** + * Unregister accesskey for the given element. + * + * @param aElement the given element + * @param aKey accesskey + */ + void UnregisterAccessKey(dom::Element* aElement, uint32_t aKey); + + /** + * Get accesskey registered on the given element or 0 if there is none. + * + * @param aElement the given element (must not be null) + * @return registered accesskey + */ + uint32_t GetRegisteredAccessKey(dom::Element* aContent); + + static void GetAccessKeyLabelPrefix(dom::Element* aElement, + nsAString& aPrefix); + + /** + * HandleAccessKey() looks for access keys which matches with aEvent and + * execute when it matches with a chrome access key or some content access + * keys. + * If the event may match chrome access keys, this handles the access key + * synchronously (if there are nested ESMs, their HandleAccessKey() are + * also called recursively). + * If the event may match content access keys and focused target is a remote + * process, this does nothing for the content because when this is called, + * it should already have been handled in the remote process. + * If the event may match content access keys and focused target is not in + * remote process but there are some remote children, this will post + * HandleAccessKey messages to all remote children. + * + * @return true if there is accesskey which aEvent and + * aAccessCharCodes match with. Otherwise, false. + * I.e., when this returns true, a target is executed + * or focused. + * Note that even if this returns false, a target in + * remote process may be executed or focused + * asynchronously. + */ + bool HandleAccessKey(WidgetKeyboardEvent* aEvent, nsPresContext* aPresContext, + nsTArray<uint32_t>& aAccessCharCodes) { + return WalkESMTreeToHandleAccessKey(aEvent, aPresContext, aAccessCharCodes, + nullptr, eAccessKeyProcessingNormal, + true); + } + + /** + * CheckIfEventMatchesAccessKey() looks for access key which matches with + * aEvent in the process but won't execute it. + * + * @return true if there is accesskey which aEvent matches with + * in this process. Otherwise, false. + */ + bool CheckIfEventMatchesAccessKey(WidgetKeyboardEvent* aEvent, + nsPresContext* aPresContext); + + nsresult SetCursor(StyleCursorKind, imgIContainer*, const ImageResolution&, + const Maybe<gfx::IntPoint>& aHotspot, nsIWidget* aWidget, + bool aLockCursor); + + /** + * Checks if the current mouse over element matches the given + * Element (which has a remote frame), and if so, notifies + * the BrowserParent of the mouse enter. + * Called when we reconstruct the BrowserParent and need to + * recompute state on the new object. + */ + void RecomputeMouseEnterStateForRemoteFrame(dom::Element& aElement); + + nsPresContext* GetPresContext() { return mPresContext; } + + NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(EventStateManager, nsIObserver) + + static dom::Document* sMouseOverDocument; + + static EventStateManager* GetActiveEventStateManager() { return sActiveESM; } + + // Sets aNewESM to be the active event state manager, and + // if aContent is non-null, marks the object as active. + static void SetActiveManager(EventStateManager* aNewESM, + nsIContent* aContent); + + static bool IsRemoteTarget(nsIContent* target); + + static bool IsTopLevelRemoteTarget(nsIContent* aTarget); + + // Returns the kind of APZ action the given WidgetWheelEvent will perform. + static Maybe<layers::APZWheelAction> APZWheelActionFor( + const WidgetWheelEvent* aEvent); + + // For some kinds of scrollings, the delta values of WidgetWheelEvent are + // possbile to be adjusted. This function is used to detect such scrollings + // and returns a wheel delta adjustment strategy to use, which is corresponded + // to the kind of the scrolling. + // It returns WheelDeltaAdjustmentStrategy::eAutoDir if the current default + // action is auto-dir scrolling which honours the scrolling target(The + // comments in WheelDeltaAdjustmentStrategy describes the concept in detail). + // It returns WheelDeltaAdjustmentStrategy::eAutoDirWithRootHonour if the + // current action is auto-dir scrolling which honours the root element in the + // document where the scrolling target is(The comments in + // WheelDeltaAdjustmentStrategy describes the concept in detail). + // It returns WheelDeltaAdjustmentStrategy::eHorizontalize if the current + // default action is horizontalized scrolling. + // It returns WheelDeltaAdjustmentStrategy::eNone to mean no delta adjustment + // strategy should be used if the scrolling is just a tranditional scrolling + // whose delta values are never possible to be adjusted. + static WheelDeltaAdjustmentStrategy GetWheelDeltaAdjustmentStrategy( + const WidgetWheelEvent& aEvent); + + // Returns user-set multipliers for a wheel event. + static void GetUserPrefsForWheelEvent(const WidgetWheelEvent* aEvent, + double* aOutMultiplierX, + double* aOutMultiplierY); + + // Holds the point in screen coords that a mouse event was dispatched to, + // before we went into pointer lock mode. This is constantly updated while + // the pointer is not locked, but we don't update it while the pointer is + // locked. This is used by dom::Event::GetScreenCoords() to make mouse + // events' screen coord appear frozen at the last mouse position while + // the pointer is locked. + static CSSIntPoint sLastScreenPoint; + + // Holds the point in client coords of the last mouse event. Used by + // dom::Event::GetClientCoords() to make mouse events' client coords appear + // frozen at the last mouse position while the pointer is locked. + static CSSIntPoint sLastClientPoint; + + /** + * If the absolute values of mMultiplierX and/or mMultiplierY are equal or + * larger than this value, the computed scroll amount isn't rounded down to + * the page width or height. + */ + static constexpr double MIN_MULTIPLIER_VALUE_ALLOWING_OVER_ONE_PAGE_SCROLL = + 1000.0; + + /** + * HandleMiddleClickPaste() handles middle mouse button event as pasting + * clipboard text. Note that if aEditorBase is nullptr, this only + * dispatches ePaste event because it's necessary for some web apps which + * want to implement their own editor and supports middle click paste. + * + * @param aPresShell The PresShell for the ESM. This lifetime + * should be guaranteed by the caller. + * @param aMouseEvent The eMouseClick event which caused the + * paste. + * @param aStatus The event status of aMouseEvent. + * @param aEditorBase EditorBase which may be pasted the + * clipboard text by the middle click. + * If there is no editor for aMouseEvent, + * set nullptr. + */ + MOZ_CAN_RUN_SCRIPT + nsresult HandleMiddleClickPaste(PresShell* aPresShell, + WidgetMouseEvent* aMouseEvent, + nsEventStatus* aStatus, + EditorBase* aEditorBase); + + static void ConsumeInteractionData( + dom::Record<nsString, dom::InteractionData>& aInteractions); + + // Stop tracking a possible drag. If aClearInChildProcesses is true, send + // a notification to any child processes that are in the drag service that + // tried to start a drag. + void StopTrackingDragGesture(bool aClearInChildProcesses); + + protected: + /* + * If aTargetFrame's widget has a cached cursor value, resets the cursor + * such that the next call to SetCursor on the widget will force an update + * of the native cursor. For use in getting puppet widget to update its + * cursor between mouse exit / enter transitions. This call basically wraps + * nsIWidget ClearCachedCursor. + */ + void ClearCachedWidgetCursor(nsIFrame* aTargetFrame); + + void UpdateCursor(nsPresContext* aPresContext, WidgetEvent* aEvent, + nsIFrame* aTargetFrame, nsEventStatus* aStatus); + /** + * Turn a GUI mouse/pointer event into a mouse/pointer event targeted at the + * specified content. This returns the primary frame for the content (or null + * if it goes away during the event). + */ + MOZ_CAN_RUN_SCRIPT nsIFrame* DispatchMouseOrPointerEvent( + WidgetMouseEvent* aMouseEvent, EventMessage aMessage, + nsIContent* aTargetContent, nsIContent* aRelatedContent); + /** + * Synthesize DOM pointerover and pointerout events + */ + void GeneratePointerEnterExit(EventMessage aMessage, + WidgetMouseEvent* aEvent); + /** + * Synthesize DOM and frame mouseover and mouseout events from this + * MOUSE_MOVE or MOUSE_EXIT event. + */ + void GenerateMouseEnterExit(WidgetMouseEvent* aMouseEvent); + /** + * Tell this ESM and ESMs in parent documents that the mouse is + * over some content in this document. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY void NotifyMouseOver( + WidgetMouseEvent* aMouseEvent, nsIContent* aContent); + /** + * Tell this ESM and ESMs in affected child documents that the mouse + * has exited this document's currently hovered content. + * TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230) + * + * @param aMouseEvent the event that triggered the mouseout + * @param aMovingInto the content node we've moved into. This is used to set + * the relatedTarget for mouseout events. Also, if it's non-null + * NotifyMouseOut will NOT change the current hover content to null; + * in that case the caller is responsible for updating hover state. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY void NotifyMouseOut(WidgetMouseEvent* aMouseEvent, + nsIContent* aMovingInto); + MOZ_CAN_RUN_SCRIPT void GenerateDragDropEnterExit( + nsPresContext* aPresContext, WidgetDragEvent* aDragEvent); + + /** + * Return mMouseEnterLeaveHelper or relevant mPointersEnterLeaveHelper + * elements wrapper. If mPointersEnterLeaveHelper does not contain wrapper for + * pointerId it create new one + */ + OverOutElementsWrapper* GetWrapperByEventID(WidgetMouseEvent* aMouseEvent); + + /** + * Fire the dragenter and dragexit/dragleave events when the mouse moves to a + * new target. + * + * @param aRelatedTarget relatedTarget to set for the event + * @param aTargetContent target to set for the event + * @param aTargetFrame target frame for the event + */ + MOZ_CAN_RUN_SCRIPT void FireDragEnterOrExit(nsPresContext* aPresContext, + WidgetDragEvent* aDragEvent, + EventMessage aMessage, + nsIContent* aRelatedTarget, + nsIContent* aTargetContent, + AutoWeakFrame& aTargetFrame); + /** + * Update the initial drag session data transfer with any changes that occur + * on cloned data transfer objects used for events. + */ + void UpdateDragDataTransfer(WidgetDragEvent* dragEvent); + + /** + * InitAndDispatchClickEvent() dispatches a click event. + * + * @param aMouseUpEvent eMouseUp event which causes the click event. + * EventCausesClickEvents() must return true + * if this event is set to it. + * @param aStatus Returns the result of click event. + * If the status indicates consumed, the + * value won't be overwritten with + * nsEventStatus_eIgnore. + * @param aMessage Should be eMouseClick, eMouseDoubleClick or + * eMouseAuxClick. + * @param aPresShell The PresShell. + * @param aMouseUpContent The event target of aMouseUpEvent. + * @param aCurrentTarget Current target of the caller. + * @param aNoContentDispatch true if the event shouldn't be exposed to + * web contents (although will be fired on + * document and window). + * @param aOverrideClickTarget Preferred click event target. If this is + * not nullptr, aMouseUpContent and + * aCurrentTarget are ignored. + */ + MOZ_CAN_RUN_SCRIPT + static nsresult InitAndDispatchClickEvent( + WidgetMouseEvent* aMouseUpEvent, nsEventStatus* aStatus, + EventMessage aMessage, PresShell* aPresShell, nsIContent* aMouseUpContent, + AutoWeakFrame aCurrentTarget, bool aNoContentDispatch, + nsIContent* aOverrideClickTarget); + + nsresult SetClickCount(WidgetMouseEvent* aEvent, nsEventStatus* aStatus, + nsIContent* aOverrideClickTarget = nullptr); + + /** + * EventCausesClickEvents() returns true when aMouseEvent is an eMouseUp + * event and it should cause eMouseClick, eMouseDoubleClick and/or + * eMouseAuxClick events. Note that this method assumes that + * aMouseEvent.mClickCount has already been initialized with SetClickCount(). + */ + static bool EventCausesClickEvents(const WidgetMouseEvent& aMouseEvent); + + /** + * PostHandleMouseUp() handles default actions of eMouseUp event. + * + * @param aMouseUpEvent eMouseUp event which causes the click event. + * EventCausesClickEvents() must return true + * if this event is set to it. + * @param aStatus Returns the result of event status. + * If one of dispatching event is consumed or + * this does something as default action, + * returns nsEventStatus_eConsumeNoDefault. + * @param aOverrideClickTarget Preferred click event target. If nullptr, + * aMouseUpEvent target and current target + * are used. + */ + MOZ_CAN_RUN_SCRIPT + nsresult PostHandleMouseUp(WidgetMouseEvent* aMouseUpEvent, + nsEventStatus* aStatus, + nsIContent* aOverrideClickTarget); + + /** + * DispatchClickEvents() dispatches eMouseClick, eMouseDoubleClick and + * eMouseAuxClick events for aMouseUpEvent. aMouseUpEvent should cause + * click event. + * + * @param aPresShell The PresShell. + * @param aMouseUpEvent eMouseUp event which causes the click event. + * EventCausesClickEvents() must return true + * if this event is set to it. + * @param aStatus Returns the result of event status. + * If one of dispatching click event is + * consumed, returns + * nsEventStatus_eConsumeNoDefault. + * @param aMouseUpContent The event target of aMouseUpEvent. + * @param aOverrideClickTarget Preferred click event target. If this is + * not nullptr, aMouseUpContent and + * current target frame of the ESM are ignored. + */ + MOZ_CAN_RUN_SCRIPT + nsresult DispatchClickEvents(PresShell* aPresShell, + WidgetMouseEvent* aMouseUpEvent, + nsEventStatus* aStatus, + nsIContent* aMouseUpContent, + nsIContent* aOverrideClickTarget); + + void EnsureDocument(nsPresContext* aPresContext); + MOZ_CAN_RUN_SCRIPT_BOUNDARY + void FlushLayout(nsPresContext* aPresContext); + + /** + * The phases of WalkESMTreeToHandleAccessKey processing. See below. + */ + enum ProcessingAccessKeyState { + eAccessKeyProcessingNormal = 0, + eAccessKeyProcessingUp, + eAccessKeyProcessingDown + }; + + /** + * Walk EMS to look for access key and execute found access key when aExecute + * is true. + * If there is registered element for the accesskey given by the key event + * and modifier mask then call element.PerformAccesskey(), otherwise call + * WalkESMTreeToHandleAccessKey() recursively, on descendant docshells first, + * then on the ancestor (with |aBubbledFrom| set to the docshell associated + * with |this|), until something matches. + * + * @param aEvent the keyboard event triggering the acccess key + * @param aPresContext the presentation context + * @param aAccessCharCodes list of charcode candidates + * @param aBubbledFrom is used by an ancestor to avoid calling + * WalkESMTreeToHandleAccessKey() on the child the call originally + * came from, i.e. this is the child that recursively called us in + * its Up phase. The initial caller passes |nullptr| here. This is to + * avoid an infinite loop. + * @param aAccessKeyState Normal, Down or Up processing phase (see enums + * above). The initial event receiver uses 'normal', then 'down' when + * processing children and Up when recursively calling its ancestor. + * @param aExecute is true, execute an accesskey if it's found. Otherwise, + * found accesskey won't be executed. + * + * @return true if there is a target which aEvent and + * aAccessCharCodes match with in this process. + * Otherwise, false. I.e., when this returns true and + * aExecute is true, a target is executed or focused. + * Note that even if this returns false, a target in + * remote process may be executed or focused + * asynchronously. + */ + bool WalkESMTreeToHandleAccessKey(WidgetKeyboardEvent* aEvent, + nsPresContext* aPresContext, + nsTArray<uint32_t>& aAccessCharCodes, + nsIDocShellTreeItem* aBubbledFrom, + ProcessingAccessKeyState aAccessKeyState, + bool aExecute); + + /** + * Look for access key and execute found access key if aExecute is true in + * the instance. + * + * @return true if there is a target which matches with + * aAccessCharCodes and aIsTrustedEvent. Otherwise, + * false. I.e., when this returns true and aExecute + * is true, a target is executed or focused. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY bool LookForAccessKeyAndExecute( + nsTArray<uint32_t>& aAccessCharCodes, bool aIsTrustedEvent, + bool aIsRepeat, bool aExecute); + + //--------------------------------------------- + // DocShell Focus Traversal Methods + //--------------------------------------------- + + dom::Element* GetFocusedElement(); + bool IsShellVisible(nsIDocShell* aShell); + + // These functions are for mousewheel and pixel scrolling + + class WheelPrefs { + public: + static WheelPrefs* GetInstance(); + static void Shutdown(); + + /** + * ApplyUserPrefsToDelta() overrides the wheel event's delta values with + * user prefs. + */ + void ApplyUserPrefsToDelta(WidgetWheelEvent* aEvent); + + /** + * Returns whether or not ApplyUserPrefsToDelta() would change the delta + * values of an event. + */ + void GetUserPrefsForEvent(const WidgetWheelEvent* aEvent, + double* aOutMultiplierX, double* aOutMultiplierY); + + /** + * If ApplyUserPrefsToDelta() changed the delta values with customized + * prefs, the overflowDelta values would be inflated. + * CancelApplyingUserPrefsFromOverflowDelta() cancels the inflation. + */ + void CancelApplyingUserPrefsFromOverflowDelta(WidgetWheelEvent* aEvent); + + /** + * Computes the default action for the aEvent with the prefs. + */ + enum Action : uint8_t { + ACTION_NONE = 0, + ACTION_SCROLL, + ACTION_HISTORY, + ACTION_ZOOM, + // Horizontalized scrolling means treating vertical wheel scrolling as + // horizontal scrolling during the process of its default action and + // plugins handling scrolling. Note that delta values as the event object + // in a DOM event listener won't be affected, and will be still the + // original values. For more details, refer to + // mozilla::WheelDeltaAdjustmentStrategy::eHorizontalize + ACTION_HORIZONTALIZED_SCROLL, + ACTION_PINCH_ZOOM, + ACTION_LAST = ACTION_PINCH_ZOOM, + // Following actions are used only by internal processing. So, cannot + // specified by prefs. + ACTION_SEND_TO_PLUGIN, + }; + Action ComputeActionFor(const WidgetWheelEvent* aEvent); + + /** + * NeedToComputeLineOrPageDelta() returns if the aEvent needs to be + * computed the lineOrPageDelta values. + */ + bool NeedToComputeLineOrPageDelta(const WidgetWheelEvent* aEvent); + + /** + * IsOverOnePageScrollAllowed*() checks whether wheel scroll amount should + * be rounded down to the page width/height (false) or not (true). + */ + bool IsOverOnePageScrollAllowedX(const WidgetWheelEvent* aEvent); + bool IsOverOnePageScrollAllowedY(const WidgetWheelEvent* aEvent); + + private: + WheelPrefs(); + ~WheelPrefs(); + + static void OnPrefChanged(const char* aPrefName, void* aClosure); + + enum Index { + INDEX_DEFAULT = 0, + INDEX_ALT, + INDEX_CONTROL, + INDEX_META, + INDEX_SHIFT, + INDEX_OS, + COUNT_OF_MULTIPLIERS + }; + + /** + * GetIndexFor() returns the index of the members which should be used for + * the aEvent. When only one modifier key of MODIFIER_ALT, + * MODIFIER_CONTROL, MODIFIER_META, MODIFIER_SHIFT or MODIFIER_OS is + * pressed, returns the index for the modifier. Otherwise, this return the + * default index which is used at either no modifier key is pressed or + * two or modifier keys are pressed. + */ + Index GetIndexFor(const WidgetWheelEvent* aEvent); + + /** + * GetPrefNameBase() returns the base pref name for aEvent. + * It's decided by GetModifierForPref() which modifier should be used for + * the aEvent. + * + * @param aBasePrefName The result, must be "mousewheel.with_*." or + * "mousewheel.default.". + */ + void GetBasePrefName(Index aIndex, nsACString& aBasePrefName); + + void Init(Index aIndex); + + void Reset(); + + /** + * Retrieve multiplier for aEvent->mDeltaX and aEvent->mDeltaY. + * + * Note that if the default action is ACTION_HORIZONTALIZED_SCROLL and the + * delta values have been adjusted by WheelDeltaHorizontalizer() before this + * function is called, this function will swap the X and Y multipliers. By + * doing this, multipliers will still apply to the delta values they + * originally corresponded to. + * + * @param aEvent The event which is being handled. + * @param aIndex The index of mMultiplierX and mMultiplierY. + * Should be result of GetIndexFor(aEvent). + * @param aMultiplierForDeltaX Will be set to multiplier for + * aEvent->mDeltaX. + * @param aMultiplierForDeltaY Will be set to multiplier for + * aEvent->mDeltaY. + */ + void GetMultiplierForDeltaXAndY(const WidgetWheelEvent* aEvent, + Index aIndex, double* aMultiplierForDeltaX, + double* aMultiplierForDeltaY); + + bool mInit[COUNT_OF_MULTIPLIERS]; + double mMultiplierX[COUNT_OF_MULTIPLIERS]; + double mMultiplierY[COUNT_OF_MULTIPLIERS]; + double mMultiplierZ[COUNT_OF_MULTIPLIERS]; + Action mActions[COUNT_OF_MULTIPLIERS]; + /** + * action values overridden by .override_x pref. + * If an .override_x value is -1, same as the + * corresponding mActions value. + */ + Action mOverriddenActionsX[COUNT_OF_MULTIPLIERS]; + + static WheelPrefs* sInstance; + }; + + /** + * DeltaDirection is used for specifying whether the called method should + * handle vertical delta or horizontal delta. + * This is clearer than using bool. + */ + enum DeltaDirection { DELTA_DIRECTION_X = 0, DELTA_DIRECTION_Y }; + + struct MOZ_STACK_CLASS EventState { + bool mDefaultPrevented; + bool mDefaultPreventedByContent; + + EventState() + : mDefaultPrevented(false), mDefaultPreventedByContent(false) {} + }; + + /** + * SendLineScrollEvent() dispatches a DOMMouseScroll event for the + * WidgetWheelEvent. This method shouldn't be called for non-trusted + * wheel event because it's not necessary for compatiblity. + * + * @param aTargetFrame The event target of wheel event. + * @param aEvent The original Wheel event. + * @param aState The event which should be set to the dispatching + * event. This also returns the dispatched event + * state. + * @param aDelta The delta value of the event. + * @param aDeltaDirection The X/Y direction of dispatching event. + */ + MOZ_CAN_RUN_SCRIPT void SendLineScrollEvent(nsIFrame* aTargetFrame, + WidgetWheelEvent* aEvent, + EventState& aState, + int32_t aDelta, + DeltaDirection aDeltaDirection); + + /** + * SendPixelScrollEvent() dispatches a MozMousePixelScroll event for the + * WidgetWheelEvent. This method shouldn't be called for non-trusted + * wheel event because it's not necessary for compatiblity. + * + * @param aTargetFrame The event target of wheel event. + * @param aEvent The original Wheel event. + * @param aState The event which should be set to the dispatching + * event. This also returns the dispatched event + * state. + * @param aPixelDelta The delta value of the event. + * @param aDeltaDirection The X/Y direction of dispatching event. + */ + MOZ_CAN_RUN_SCRIPT void SendPixelScrollEvent(nsIFrame* aTargetFrame, + WidgetWheelEvent* aEvent, + EventState& aState, + int32_t aPixelDelta, + DeltaDirection aDeltaDirection); + + /** + * ComputeScrollTargetAndMayAdjustWheelEvent() returns the scrollable frame + * which should be scrolled. + * + * @param aTargetFrame The event target of the wheel event. + * @param aEvent The handling mouse wheel event. + * @param aOptions The options for finding the scroll target. + * Callers should use COMPUTE_*. + * @return The scrollable frame which should be scrolled. + */ + // These flags are used in ComputeScrollTargetAndMayAdjustWheelEvent(). + // Callers should use COMPUTE_*. + enum { + PREFER_MOUSE_WHEEL_TRANSACTION = 0x00000001, + PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_X_AXIS = 0x00000002, + PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_Y_AXIS = 0x00000004, + START_FROM_PARENT = 0x00000008, + INCLUDE_PLUGIN_AS_TARGET = 0x00000010, + // Indicates the wheel scroll event being computed is an auto-dir scroll, so + // its delta may be adjusted after being computed. + MAY_BE_ADJUSTED_BY_AUTO_DIR = 0x00000020, + }; + enum ComputeScrollTargetOptions { + // At computing scroll target for legacy mouse events, we should return + // first scrollable element even when it's not scrollable to the direction. + COMPUTE_LEGACY_MOUSE_SCROLL_EVENT_TARGET = 0, + // Default action prefers the scrolled element immediately before if it's + // still under the mouse cursor. Otherwise, it prefers the nearest + // scrollable ancestor which will be scrolled actually. + COMPUTE_DEFAULT_ACTION_TARGET = + (PREFER_MOUSE_WHEEL_TRANSACTION | + PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_X_AXIS | + PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_Y_AXIS), + COMPUTE_DEFAULT_ACTION_TARGET_WITH_AUTO_DIR = + (COMPUTE_DEFAULT_ACTION_TARGET | MAY_BE_ADJUSTED_BY_AUTO_DIR), + // Look for the nearest scrollable ancestor which can be scrollable with + // aEvent. + COMPUTE_SCROLLABLE_ANCESTOR_ALONG_X_AXIS = + (PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_X_AXIS | START_FROM_PARENT), + COMPUTE_SCROLLABLE_ANCESTOR_ALONG_Y_AXIS = + (PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_Y_AXIS | START_FROM_PARENT), + COMPUTE_SCROLLABLE_ANCESTOR_ALONG_X_AXIS_WITH_AUTO_DIR = + (COMPUTE_SCROLLABLE_ANCESTOR_ALONG_X_AXIS | + MAY_BE_ADJUSTED_BY_AUTO_DIR), + COMPUTE_SCROLLABLE_ANCESTOR_ALONG_Y_AXIS_WITH_AUTO_DIR = + (COMPUTE_SCROLLABLE_ANCESTOR_ALONG_Y_AXIS | + MAY_BE_ADJUSTED_BY_AUTO_DIR), + }; + + // Compute the scroll target. + // The delta values in the wheel event may be changed if the event is for + // auto-dir scrolling. For information on auto-dir, + // @see mozilla::WheelDeltaAdjustmentStrategy + nsIFrame* ComputeScrollTargetAndMayAdjustWheelEvent( + nsIFrame* aTargetFrame, WidgetWheelEvent* aEvent, + ComputeScrollTargetOptions aOptions); + + nsIFrame* ComputeScrollTargetAndMayAdjustWheelEvent( + nsIFrame* aTargetFrame, double aDirectionX, double aDirectionY, + WidgetWheelEvent* aEvent, ComputeScrollTargetOptions aOptions); + + nsIFrame* ComputeScrollTarget(nsIFrame* aTargetFrame, + WidgetWheelEvent* aEvent, + ComputeScrollTargetOptions aOptions) { + MOZ_ASSERT(!(aOptions & MAY_BE_ADJUSTED_BY_AUTO_DIR), + "aEvent may be modified by auto-dir"); + return ComputeScrollTargetAndMayAdjustWheelEvent(aTargetFrame, aEvent, + aOptions); + } + + nsIFrame* ComputeScrollTarget(nsIFrame* aTargetFrame, double aDirectionX, + double aDirectionY, WidgetWheelEvent* aEvent, + ComputeScrollTargetOptions aOptions) { + MOZ_ASSERT(!(aOptions & MAY_BE_ADJUSTED_BY_AUTO_DIR), + "aEvent may be modified by auto-dir"); + return ComputeScrollTargetAndMayAdjustWheelEvent( + aTargetFrame, aDirectionX, aDirectionY, aEvent, aOptions); + } + + /** + * GetScrollAmount() returns the scroll amount in app uints of one line or + * one page. If the wheel event scrolls a page, returns the page width and + * height. Otherwise, returns line height for both its width and height. + * + * @param aScrollableFrame A frame which will be scrolled by the event. + * The result of + * ComputeScrollTargetAndMayAdjustWheelEvent() is + * expected for this value. + * This can be nullptr if there is no scrollable + * frame. Then, this method uses root frame's + * line height or visible area's width and height. + */ + nsSize GetScrollAmount(nsPresContext* aPresContext, WidgetWheelEvent* aEvent, + nsIScrollableFrame* aScrollableFrame); + + /** + * DoScrollText() scrolls the scrollable frame for aEvent. + */ + void DoScrollText(nsIScrollableFrame* aScrollableFrame, + WidgetWheelEvent* aEvent); + + void DoScrollHistory(int32_t direction); + void DoScrollZoom(nsIFrame* aTargetFrame, int32_t adjustment); + void ChangeZoom(bool aIncrease); + + /** + * DeltaAccumulator class manages delta values for dispatching DOMMouseScroll + * event. If wheel events are caused by pixel scroll only devices or + * the delta values are customized by prefs, this class stores the delta + * values and set lineOrPageDelta values. + */ + class DeltaAccumulator { + public: + static DeltaAccumulator* GetInstance() { + if (!sInstance) { + sInstance = new DeltaAccumulator; + } + return sInstance; + } + + static void Shutdown() { + delete sInstance; + sInstance = nullptr; + } + + bool IsInTransaction() { return mHandlingDeltaMode != UINT32_MAX; } + + /** + * InitLineOrPageDelta() stores pixel delta values of WidgetWheelEvents + * which are caused if it's needed. And if the accumulated delta becomes a + * line height, sets lineOrPageDeltaX and lineOrPageDeltaY automatically. + */ + void InitLineOrPageDelta(nsIFrame* aTargetFrame, EventStateManager* aESM, + WidgetWheelEvent* aEvent); + + /** + * Reset() resets all members. + */ + void Reset(); + + /** + * ComputeScrollAmountForDefaultAction() computes the default action's + * scroll amount in device pixels with mPendingScrollAmount*. + */ + nsIntPoint ComputeScrollAmountForDefaultAction( + WidgetWheelEvent* aEvent, const nsIntSize& aScrollAmountInDevPixels); + + private: + DeltaAccumulator() + : mX(0.0), + mY(0.0), + mPendingScrollAmountX(0.0), + mPendingScrollAmountY(0.0), + mHandlingDeltaMode(UINT32_MAX), + mIsNoLineOrPageDeltaDevice(false) {} + + double mX; + double mY; + + // When default action of a wheel event is scroll but some delta values + // are ignored because the computed amount values are not integer, the + // fractional values are saved by these members. + double mPendingScrollAmountX; + double mPendingScrollAmountY; + + TimeStamp mLastTime; + + uint32_t mHandlingDeltaMode; + bool mIsNoLineOrPageDeltaDevice; + + static DeltaAccumulator* sInstance; + }; + + // end mousewheel functions + + /* + * When a touch gesture is about to start, this function determines what + * kind of gesture interaction we will want to use, based on what is + * underneath the initial touch point. + * Currently it decides between panning (finger scrolling) or dragging + * the target element, as well as the orientation to trigger panning and + * display visual boundary feedback. The decision is stored back in aEvent. + */ + void DecideGestureEvent(WidgetGestureNotifyEvent* aEvent, + nsIFrame* targetFrame); + + // routines for the d&d gesture tracking state machine + void BeginTrackingDragGesture(nsPresContext* aPresContext, + WidgetMouseEvent* aDownEvent, + nsIFrame* aDownFrame); + + void SetGestureDownPoint(WidgetGUIEvent* aEvent); + + LayoutDeviceIntPoint GetEventRefPoint(WidgetEvent* aEvent) const; + + friend class mozilla::dom::BrowserParent; + void BeginTrackingRemoteDragGesture(nsIContent* aContent, + dom::RemoteDragStartData* aDragStartData); + + MOZ_CAN_RUN_SCRIPT + void GenerateDragGesture(nsPresContext* aPresContext, + WidgetInputEvent* aEvent); + + /** + * When starting a dnd session, UA must fire a pointercancel event and stop + * firing the subsequent pointer events. + */ + MOZ_CAN_RUN_SCRIPT + void MaybeFirePointerCancel(WidgetInputEvent* aEvent); + + /** + * Determine which node the drag should be targeted at. + * This is either the node clicked when there is a selection, or, for HTML, + * the element with a draggable property set to true. + * + * aSelectionTarget - target to check for selection + * aDataTransfer - data transfer object that will contain the data to drag + * aAllowEmptyDataTransfer - [out] set to true, if dnd operation can be + * started even if DataTransfer is empty + * aSelection - [out] set to the selection to be dragged + * aTargetNode - [out] the draggable node, or null if there isn't one + * aPrincipal - [out] set to the triggering principal of the drag, or null + * if it's from browser chrome or OS + * aCookieJarSettings - [out] set to the cookieJarSettings of the drag, or + * null if it's from browser chrome or OS. + */ + void DetermineDragTargetAndDefaultData( + nsPIDOMWindowOuter* aWindow, nsIContent* aSelectionTarget, + dom::DataTransfer* aDataTransfer, bool* aAllowEmptyDataTransfer, + dom::Selection** aSelection, + dom::RemoteDragStartData** aRemoteDragStartData, nsIContent** aTargetNode, + nsIPrincipal** aPrincipal, nsIContentSecurityPolicy** aCsp, + nsICookieJarSettings** aCookieJarSettings); + + /* + * Perform the default handling for the dragstart event and set up a + * drag for aDataTransfer if it contains any data. Returns true if a drag has + * started. + * + * aDragEvent - the dragstart event + * aDataTransfer - the data transfer that holds the data to be dragged + * aAllowEmptyDataTransfer - if true, dnd can be started even if there is no + * data to drag + * aDragTarget - the target of the drag + * aSelection - the selection to be dragged + * aData - information pertaining to a drag started in a child process + * aPrincipal - the triggering principal of the drag, or null if it's from + * browser chrome or OS + * aCookieJarSettings - the cookieJarSettings of the drag. or null if it's + * from browser chrome or OS. + */ + MOZ_CAN_RUN_SCRIPT + bool DoDefaultDragStart( + nsPresContext* aPresContext, WidgetDragEvent* aDragEvent, + dom::DataTransfer* aDataTransfer, bool aAllowEmptyDataTransfer, + nsIContent* aDragTarget, dom::Selection* aSelection, + dom::RemoteDragStartData* aDragStartData, nsIPrincipal* aPrincipal, + nsIContentSecurityPolicy* aCsp, nsICookieJarSettings* aCookieJarSettings); + + bool IsTrackingDragGesture() const { return mGestureDownContent != nullptr; } + /** + * Set the fields of aEvent to reflect the mouse position and modifier keys + * that were set when the user first pressed the mouse button (stored by + * BeginTrackingDragGesture). aEvent->mWidget must be + * mCurrentTarget->GetNearestWidget(). + */ + void FillInEventFromGestureDown(WidgetMouseEvent* aEvent); + + MOZ_CAN_RUN_SCRIPT + nsresult DoContentCommandEvent(WidgetContentCommandEvent* aEvent); + MOZ_CAN_RUN_SCRIPT + nsresult DoContentCommandInsertTextEvent(WidgetContentCommandEvent* aEvent); + nsresult DoContentCommandScrollEvent(WidgetContentCommandEvent* aEvent); + + dom::BrowserParent* GetCrossProcessTarget(); + bool IsTargetCrossProcess(WidgetGUIEvent* aEvent); + + /** + * DispatchCrossProcessEvent() try to post aEvent to target remote process. + * If you need to check if the event is posted to a remote process, you + * can use aEvent->HasBeenPostedToRemoteProcess(). + */ + void DispatchCrossProcessEvent(WidgetEvent* aEvent, + dom::BrowserParent* aRemoteTarget, + nsEventStatus* aStatus); + /** + * HandleCrossProcessEvent() may post aEvent to target remote processes. + * When it succeeded to post the event to at least one remote process, + * returns true. Otherwise, including the case not tried to dispatch to + * post the event, returns false. + * If you need to check if the event is posted to at least one remote + * process, you can use aEvent->HasBeenPostedToRemoteProcess(). + */ + bool HandleCrossProcessEvent(WidgetEvent* aEvent, nsEventStatus* aStatus); + + void ReleaseCurrentIMEContentObserver(); + + MOZ_CAN_RUN_SCRIPT void HandleQueryContentEvent( + WidgetQueryContentEvent* aEvent); + + private: + // Removes a node from the :hover / :active chain if needed, notifying if the + // node is not a NAC subtree. + // + // Only meant to be called from ContentRemoved and + // NativeAnonymousContentRemoved. + void RemoveNodeFromChainIfNeeded(ElementState aState, + nsIContent* aContentRemoved, bool aNotify); + + bool IsEventOutsideDragThreshold(WidgetInputEvent* aEvent) const; + + static inline void DoStateChange(dom::Element* aElement, ElementState aState, + bool aAddState); + static inline void DoStateChange(nsIContent* aContent, ElementState aState, + bool aAddState); + static void UpdateAncestorState(nsIContent* aStartNode, + nsIContent* aStopBefore, ElementState aState, + bool aAddState); + static void ResetLastOverForContent( + const uint32_t& aIdx, const RefPtr<OverOutElementsWrapper>& aChunk, + nsIContent* aClosure); + + /** + * Update the attribute mLastRefPoint of the mouse event. It should be + * the center of the window while the pointer is locked. + * the same value as mRefPoint while there is no known last ref point. + * the same value as the last known mRefPoint. + */ + static void UpdateLastRefPointOfMouseEvent(WidgetMouseEvent* aMouseEvent); + + static void ResetPointerToWindowCenterWhilePointerLocked( + WidgetMouseEvent* aMouseEvent); + + // Update the last known ref point to the current event's mRefPoint. + static void UpdateLastPointerPosition(WidgetMouseEvent* aMouseEvent); + + /** + * Notify target when user has been interaction with some speicific user + * gestures which are eKeyUp, eMouseUp, eTouchEnd. + */ + void NotifyTargetUserActivation(WidgetEvent* aEvent, + nsIContent* aTargetContent); + + already_AddRefed<EventStateManager> ESMFromContentOrThis( + nsIContent* aContent); + + StyleCursorKind mLockCursor; + bool mLastFrameConsumedSetCursor; + + // Last mouse event mRefPoint (the offset from the widget's origin in + // device pixels) when mouse was locked, used to restore mouse position + // after unlocking. + static LayoutDeviceIntPoint sPreLockPoint; + + // Stores the mRefPoint of the last synthetic mouse move we dispatched + // to re-center the mouse when we were pointer locked. If this is (-1,-1) it + // means we've not recently dispatched a centering event. We use this to + // detect when we receive the synth event, so we can cancel and not send it + // to content. + static LayoutDeviceIntPoint sSynthCenteringPoint; + + WeakFrame mCurrentTarget; + nsCOMPtr<nsIContent> mCurrentTargetContent; + static AutoWeakFrame sLastDragOverFrame; + + // Stores the mRefPoint (the offset from the widget's origin in device + // pixels) of the last mouse event. + static LayoutDeviceIntPoint sLastRefPoint; + + // member variables for the d&d gesture state machine + LayoutDeviceIntPoint mGestureDownPoint; // screen coordinates + // The content to use as target if we start a d&d (what we drag). + RefPtr<nsIContent> mGestureDownContent; + // The content of the frame where the mouse-down event occurred. It's the same + // as the target in most cases but not always - for example when dragging + // an <area> of an image map this is the image. (bug 289667) + nsCOMPtr<nsIContent> mGestureDownFrameOwner; + // Data associated with a drag started in a content process. + RefPtr<dom::RemoteDragStartData> mGestureDownDragStartData; + // State of keys when the original gesture-down happened + Modifiers mGestureModifiers; + uint16_t mGestureDownButtons; + + nsCOMPtr<nsIContent> mLastLeftMouseDownContent; + nsCOMPtr<nsIContent> mLastMiddleMouseDownContent; + nsCOMPtr<nsIContent> mLastRightMouseDownContent; + + nsCOMPtr<nsIContent> mActiveContent; + nsCOMPtr<nsIContent> mHoverContent; + static nsCOMPtr<nsIContent> sDragOverContent; + nsCOMPtr<nsIContent> mURLTargetContent; + + nsPresContext* mPresContext; // Not refcnted + RefPtr<dom::Document> mDocument; // Doesn't necessarily need to be owner + + RefPtr<IMEContentObserver> mIMEContentObserver; + + uint32_t mLClickCount; + uint32_t mMClickCount; + uint32_t mRClickCount; + + bool mShouldAlwaysUseLineDeltas : 1; + bool mShouldAlwaysUseLineDeltasInitialized : 1; + + bool mGestureDownInTextControl : 1; + + bool mInTouchDrag; + + bool m_haveShutdown; + + RefPtr<OverOutElementsWrapper> mMouseEnterLeaveHelper; + nsRefPtrHashtable<nsUint32HashKey, OverOutElementsWrapper> + mPointersEnterLeaveHelper; + + // Array for accesskey support + nsCOMArray<dom::Element> mAccessKeys; + + bool ShouldAlwaysUseLineDeltas(); + + public: + static nsresult UpdateUserActivityTimer(void); + + static bool sNormalLMouseEventInProcess; + static int16_t sCurrentMouseBtn; + + static EventStateManager* sActiveESM; + + static void ClearGlobalActiveContent(EventStateManager* aClearer); + + // Functions used for click hold context menus + nsCOMPtr<nsITimer> mClickHoldTimer; + void CreateClickHoldTimer(nsPresContext* aPresContext, nsIFrame* aDownFrame, + WidgetGUIEvent* aMouseDownEvent); + void KillClickHoldTimer(); + MOZ_CAN_RUN_SCRIPT_BOUNDARY void FireContextClick(); + + MOZ_CAN_RUN_SCRIPT static void SetPointerLock(nsIWidget* aWidget, + nsIContent* aElement); + static void sClickHoldCallback(nsITimer* aTimer, void* aESM); +}; + +} // namespace mozilla + +// Click and double-click events need to be handled even for content that +// has no frame. This is required for Web compatibility. +#define NS_EVENT_NEEDS_FRAME(event) \ + ((event)->mMessage != eMouseClick && \ + (event)->mMessage != eMouseDoubleClick && \ + (event)->mMessage != eMouseAuxClick) + +#endif // mozilla_EventStateManager_h_ |