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Diffstat (limited to 'dom/events/EventStateManager.h')
| -rw-r--r-- | dom/events/EventStateManager.h | 1051 |
1 files changed, 1051 insertions, 0 deletions
diff --git a/dom/events/EventStateManager.h b/dom/events/EventStateManager.h new file mode 100644 index 000000000..49ecf0586 --- /dev/null +++ b/dom/events/EventStateManager.h @@ -0,0 +1,1051 @@ +/* -*- 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_ |