/* -*- 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 "mozilla/TimeStamp.h" #include "nsIFrame.h" #include "Units.h" class nsFrameLoader; class nsIContent; class nsIDocument; class nsIDocShell; class nsIDocShellTreeItem; class imgIContainer; class EnterLeaveDispatcher; class nsIContentViewer; class nsIScrollableFrame; class nsITimer; class nsPresContext; namespace mozilla { class EnterLeaveDispatcher; class EventStates; class IMEContentObserver; class ScrollbarsForWheel; class WheelTransaction; namespace dom { class DataTransfer; class Element; class TabParent; } // namespace dom class OverOutElementsWrapper final : public nsISupports { ~OverOutElementsWrapper(); public: OverOutElementsWrapper(); NS_DECL_CYCLE_COLLECTING_ISUPPORTS NS_DECL_CYCLE_COLLECTION_CLASS(OverOutElementsWrapper) nsWeakFrame 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; 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. */ nsresult PreHandleEvent(nsPresContext* aPresContext, WidgetEvent* aEvent, nsIFrame* aTargetFrame, nsIContent* aTargetContent, nsEventStatus* aStatus); /* 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. */ nsresult PostHandleEvent(nsPresContext* aPresContext, WidgetEvent* aEvent, nsIFrame* aTargetFrame, nsEventStatus* aStatus); void PostHandleKeyboardEvent(WidgetKeyboardEvent* aKeyboardEvent, nsEventStatus& aStatus, bool dispatchedToContentProcess); /** * DispatchLegacyMouseScrollEvents() dispatches eLegacyMouseLineOrPageScroll * event and eLegacyMousePixelScroll event for compatibility with old Gecko. */ void DispatchLegacyMouseScrollEvents(nsIFrame* aTargetFrame, WidgetWheelEvent* aEvent, nsEventStatus* aStatus); void NotifyDestroyPresContext(nsPresContext* aPresContext); void SetPresContext(nsPresContext* aPresContext); void ClearFrameRefs(nsIFrame* aFrame); nsIFrame* GetEventTarget(); already_AddRefed<nsIContent> GetEventTargetContent(WidgetEvent* aEvent); /** * Notify that the given NS_EVENT_STATE_* bit has changed for this content. * @param aContent Content which has changed states * @param aState Corresponding state flags such as NS_EVENT_STATE_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, EventStates aState); void ContentRemoved(nsIDocument* aDocument, nsIContent* aContent); 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. */ void TryToFlushPendingNotificationsToIME(); /** * Register accesskey on the given element. When accesskey is activated then * the element will be notified via nsIContent::PerformAccesskey() method. * * @param aContent the given element * @param aKey accesskey */ void RegisterAccessKey(nsIContent* aContent, uint32_t aKey); /** * Unregister accesskey for the given element. * * @param aContent the given element * @param aKey accesskey */ void UnregisterAccessKey(nsIContent* aContent, uint32_t aKey); /** * Get accesskey registered on the given element or 0 if there is none. * * @param aContent the given element (must not be null) * @return registered accesskey */ uint32_t GetRegisteredAccessKey(nsIContent* aContent); static void GetAccessKeyLabelPrefix(dom::Element* aElement, nsAString& aPrefix); bool HandleAccessKey(WidgetKeyboardEvent* aEvent, nsPresContext* aPresContext, nsTArray<uint32_t>& aAccessCharCodes, int32_t aModifierMask, bool aMatchesContentAccessKey) { return HandleAccessKey(aEvent, aPresContext, aAccessCharCodes, aMatchesContentAccessKey, nullptr, eAccessKeyProcessingNormal, aModifierMask); } nsresult SetCursor(int32_t aCursor, imgIContainer* aContainer, bool aHaveHotspot, float aHotspotX, float aHotspotY, nsIWidget* aWidget, bool aLockCursor); static void StartHandlingUserInput() { ++sUserInputEventDepth; ++sUserInputCounter; if (sUserInputEventDepth == 1) { sLatestUserInputStart = sHandlingInputStart = TimeStamp::Now(); } } static void StopHandlingUserInput() { --sUserInputEventDepth; if (sUserInputEventDepth == 0) { sHandlingInputStart = TimeStamp(); } } /** * Returns true if the current code is being executed as a result of * user input. This includes anything that is initiated by user, * with the exception of page load events or mouse over events. If * this method is called from asynchronously executed code, such as * during layout reflows, it will return false. If more time has * elapsed since the user input than is specified by the * dom.event.handling-user-input-time-limit pref (default 1 second), * this function also returns false. */ static bool IsHandlingUserInput(); /** * Get the number of user inputs handled since process start. This * includes anything that is initiated by user, with the exception * of page load events or mouse over events. */ static uint64_t UserInputCount() { return sUserInputCounter; } /** * Get the timestamp at which the latest user input was handled. * * Guaranteed to be monotonic. Until the first user input, return * the epoch. */ static TimeStamp LatestUserInputStart() { return sLatestUserInputStart; } nsPresContext* GetPresContext() { return mPresContext; } NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(EventStateManager, nsIObserver) static nsIDocument* 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); // Sets the full-screen event state on aElement to aIsFullScreen. static void SetFullScreenState(dom::Element* aElement, bool aIsFullScreen); static bool IsRemoteTarget(nsIContent* aTarget); // Returns true if the given WidgetWheelEvent will resolve to a scroll action. static bool WheelEventIsScrollAction(WidgetWheelEvent* aEvent); // Returns user-set multipliers for a wheel event. static void GetUserPrefsForWheelEvent(WidgetWheelEvent* aEvent, double* aOutMultiplierX, double* aOutMultiplierY); // Returns whether or not a frame can be vertically scrolled with a mouse // wheel (as opposed to, say, a selection or touch scroll). static bool CanVerticallyScrollFrameWithWheel(nsIFrame* aFrame); // 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; static bool sIsPointerLocked; static nsWeakPtr sPointerLockedElement; static nsWeakPtr sPointerLockedDoc; /** * 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. */ enum { MIN_MULTIPLIER_VALUE_ALLOWING_OVER_ONE_PAGE_SCROLL = 1000 }; protected: /** * Prefs class capsules preference management. */ class Prefs { public: static bool KeyCausesActivation() { return sKeyCausesActivation; } static bool ClickHoldContextMenu() { return sClickHoldContextMenu; } static int32_t ChromeAccessModifierMask(); static int32_t ContentAccessModifierMask(); static void Init(); static void OnChange(const char* aPrefName, void*); static void Shutdown(); private: static bool sKeyCausesActivation; static bool sClickHoldContextMenu; static int32_t sGenericAccessModifierKey; static int32_t sChromeAccessModifierMask; static int32_t sContentAccessModifierMask; static int32_t GetAccessModifierMask(int32_t aItemType); }; /** * Get appropriate access modifier mask for the aDocShell. Returns -1 if * access key isn't available. */ static int32_t GetAccessModifierMaskFor(nsISupports* aDocShell); /* * 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). */ 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. */ 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. * @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. */ void NotifyMouseOut(WidgetMouseEvent* aMouseEvent, nsIContent* aMovingInto); 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 */ void FireDragEnterOrExit(nsPresContext* aPresContext, WidgetDragEvent* aDragEvent, EventMessage aMessage, nsIContent* aRelatedTarget, nsIContent* aTargetContent, nsWeakFrame& 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); nsresult SetClickCount(WidgetMouseEvent* aEvent, nsEventStatus* aStatus); nsresult CheckForAndDispatchClick(WidgetMouseEvent* aEvent, nsEventStatus* aStatus); void EnsureDocument(nsPresContext* aPresContext); void FlushPendingEvents(nsPresContext* aPresContext); /** * The phases of HandleAccessKey processing. See below. */ typedef enum { eAccessKeyProcessingNormal = 0, eAccessKeyProcessingUp, eAccessKeyProcessingDown } ProcessingAccessKeyState; /** * Access key handling. If there is registered content for the accesskey * given by the key event and modifier mask then call * content.PerformAccesskey(), otherwise call HandleAccessKey() 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 aMatchesContentAccessKey true if the content accesskey modifier is pressed * @param aBubbledFrom is used by an ancestor to avoid calling HandleAccessKey() * 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 aModifierMask modifier mask for the key event */ bool HandleAccessKey(WidgetKeyboardEvent* aEvent, nsPresContext* aPresContext, nsTArray<uint32_t>& aAccessCharCodes, bool aMatchesContentAccessKey, nsIDocShellTreeItem* aBubbledFrom, ProcessingAccessKeyState aAccessKeyState, int32_t aModifierMask); bool ExecuteAccessKey(nsTArray<uint32_t>& aAccessCharCodes, bool aIsTrustedEvent); //--------------------------------------------- // DocShell Focus Traversal Methods //--------------------------------------------- nsIContent* GetFocusedContent(); 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(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, ACTION_LAST = ACTION_ZOOM, // Following actions are used only by internal processing. So, cannot // specified by prefs. ACTION_SEND_TO_PLUGIN }; Action ComputeActionFor(WidgetWheelEvent* aEvent); /** * NeedToComputeLineOrPageDelta() returns if the aEvent needs to be * computed the lineOrPageDelta values. */ bool NeedToComputeLineOrPageDelta(WidgetWheelEvent* aEvent); /** * IsOverOnePageScrollAllowed*() checks whether wheel scroll amount should * be rounded down to the page width/height (false) or not (true). */ bool IsOverOnePageScrollAllowedX(WidgetWheelEvent* aEvent); bool IsOverOnePageScrollAllowedY(WidgetWheelEvent* aEvent); /** * WheelEventsEnabledOnPlugins() returns true if user wants to use mouse * wheel on plugins. */ static bool WheelEventsEnabledOnPlugins(); 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(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(); 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; static bool sWheelEventsEnabledOnPlugins; }; /** * 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. */ 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. */ void SendPixelScrollEvent(nsIFrame* aTargetFrame, WidgetWheelEvent* aEvent, EventState& aState, int32_t aPixelDelta, DeltaDirection aDeltaDirection); /** * ComputeScrollTarget() 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 ComputeScrollTarget(). 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 }; 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_EXCEPT_PLUGIN = (PREFER_MOUSE_WHEEL_TRANSACTION | PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_X_AXIS | PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_Y_AXIS), // When this is specified, the result may be nsPluginFrame. In such case, // the frame doesn't have nsIScrollableFrame interface. COMPUTE_DEFAULT_ACTION_TARGET = (COMPUTE_DEFAULT_ACTION_TARGET_EXCEPT_PLUGIN | INCLUDE_PLUGIN_AS_TARGET), // 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) }; static ComputeScrollTargetOptions RemovePluginFromTarget( ComputeScrollTargetOptions aOptions) { switch (aOptions) { case COMPUTE_DEFAULT_ACTION_TARGET: return COMPUTE_DEFAULT_ACTION_TARGET_EXCEPT_PLUGIN; default: MOZ_ASSERT(!(aOptions & INCLUDE_PLUGIN_AS_TARGET)); return aOptions; } } nsIFrame* ComputeScrollTarget(nsIFrame* aTargetFrame, WidgetWheelEvent* aEvent, ComputeScrollTargetOptions aOptions); nsIFrame* ComputeScrollTarget(nsIFrame* aTargetFrame, double aDirectionX, double aDirectionY, WidgetWheelEvent* aEvent, ComputeScrollTargetOptions 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 ComputeScrollTarget() 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); nsresult GetContentViewer(nsIContentViewer** aCv); nsresult ChangeTextSize(int32_t change); nsresult ChangeFullZoom(int32_t change); /** * 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); friend class mozilla::dom::TabParent; void BeginTrackingRemoteDragGesture(nsIContent* aContent); void StopTrackingDragGesture(); void GenerateDragGesture(nsPresContext* aPresContext, 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 * aSelection - [out] set to the selection to be dragged * aTargetNode - [out] the draggable node, or null if there isn't one */ void DetermineDragTargetAndDefaultData(nsPIDOMWindowOuter* aWindow, nsIContent* aSelectionTarget, dom::DataTransfer* aDataTransfer, nsISelection** aSelection, nsIContent** aTargetNode); /* * 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 * aDragTarget - the target of the drag * aSelection - the selection to be dragged */ bool DoDefaultDragStart(nsPresContext* aPresContext, WidgetDragEvent* aDragEvent, dom::DataTransfer* aDataTransfer, nsIContent* aDragTarget, nsISelection* aSelection); 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); nsresult DoContentCommandEvent(WidgetContentCommandEvent* aEvent); nsresult DoContentCommandScrollEvent(WidgetContentCommandEvent* aEvent); dom::TabParent *GetCrossProcessTarget(); bool IsTargetCrossProcess(WidgetGUIEvent* aEvent); bool DispatchCrossProcessEvent(WidgetEvent* aEvent, nsFrameLoader* aRemote, nsEventStatus *aStatus); bool HandleCrossProcessEvent(WidgetEvent* aEvent, nsEventStatus* aStatus); void ReleaseCurrentIMEContentObserver(); void HandleQueryContentEvent(WidgetQueryContentEvent* aEvent); private: static inline void DoStateChange(dom::Element* aElement, EventStates aState, bool aAddState); static inline void DoStateChange(nsIContent* aContent, EventStates aState, bool aAddState); static void UpdateAncestorState(nsIContent* aStartNode, nsIContent* aStopBefore, EventStates aState, bool aAddState); static void ResetLastOverForContent(const uint32_t& aIdx, RefPtr<OverOutElementsWrapper>& aChunk, nsIContent* aClosure); int32_t 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; nsWeakFrame mCurrentTarget; nsCOMPtr<nsIContent> mCurrentTargetContent; static nsWeakFrame 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). nsCOMPtr<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; // State of keys when the original gesture-down happened Modifiers mGestureModifiers; uint16_t mGestureDownButtons; nsCOMPtr<nsIContent> mLastLeftMouseDownContent; nsCOMPtr<nsIContent> mLastLeftMouseDownContentParent; nsCOMPtr<nsIContent> mLastMiddleMouseDownContent; nsCOMPtr<nsIContent> mLastMiddleMouseDownContentParent; nsCOMPtr<nsIContent> mLastRightMouseDownContent; nsCOMPtr<nsIContent> mLastRightMouseDownContentParent; nsCOMPtr<nsIContent> mActiveContent; nsCOMPtr<nsIContent> mHoverContent; static nsCOMPtr<nsIContent> sDragOverContent; nsCOMPtr<nsIContent> mURLTargetContent; nsPresContext* mPresContext; // Not refcnted nsCOMPtr<nsIDocument> mDocument; // Doesn't necessarily need to be owner RefPtr<IMEContentObserver> mIMEContentObserver; uint32_t mLClickCount; uint32_t mMClickCount; uint32_t mRClickCount; bool mInTouchDrag; bool m_haveShutdown; // Time at which we began handling user input. Reset to the epoch // once we have finished handling user input. static TimeStamp sHandlingInputStart; // Time at which we began handling the latest user input. Not reset // at the end of the input. static TimeStamp sLatestUserInputStart; RefPtr<OverOutElementsWrapper> mMouseEnterLeaveHelper; nsRefPtrHashtable<nsUint32HashKey, OverOutElementsWrapper> mPointersEnterLeaveHelper; public: static nsresult UpdateUserActivityTimer(void); // Array for accesskey support nsCOMArray<nsIContent> mAccessKeys; // The number of user inputs handled since process start. This // includes anything that is initiated by user, with the exception // of page load events or mouse over events. static uint64_t sUserInputCounter; // The current depth of user inputs. This includes anything that is // initiated by user, with the exception of page load events or // mouse over events. Incremented whenever we start handling a user // input, decremented when we have finished handling a user // input. This depth is *not* reset in case of nested event loops. static int32_t sUserInputEventDepth; static bool sNormalLMouseEventInProcess; 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(); void FireContextClick(); static void SetPointerLock(nsIWidget* aWidget, nsIContent* aElement) ; static void sClickHoldCallback ( nsITimer* aTimer, void* aESM ) ; }; /** * This class is used while processing real user input. During this time, popups * are allowed. For mousedown events, mouse capturing is also permitted. */ class AutoHandlingUserInputStatePusher { public: AutoHandlingUserInputStatePusher(bool aIsHandlingUserInput, WidgetEvent* aEvent, nsIDocument* aDocument); ~AutoHandlingUserInputStatePusher(); protected: bool mIsHandlingUserInput; bool mIsMouseDown; bool mResetFMMouseButtonHandlingState; nsCOMPtr<nsIDocument> mMouseButtonEventHandlingDocument; private: // Hide so that this class can only be stack-allocated static void* operator new(size_t /*size*/) CPP_THROW_NEW { return nullptr; } static void operator delete(void* /*memory*/) {} }; } // 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)->HasPluginActivationEventMessage() && \ (event)->mMessage != eMouseClick && \ (event)->mMessage != eMouseDoubleClick) #endif // mozilla_EventStateManager_h_