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gecko/layout/base/nsPresShell.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Steve Clark <buster@netscape.com>
* Håkan Waara <hwaara@chello.se>
* Dan Rosen <dr@netscape.com>
* Daniel Glazman <glazman@netscape.com>
* Mats Palmgren <matspal@gmail.com>
* Mihai Sucan <mihai.sucan@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK *****
*
* This Original Code has been modified by IBM Corporation.
* Modifications made by IBM described herein are
* Copyright (c) International Business Machines
* Corporation, 2000
*
* Modifications to Mozilla code or documentation
* identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 05/03/2000 IBM Corp. Observer events for reflow states
*/
/* a presentation of a document, part 2 */
#ifndef nsPresShell_h_
#define nsPresShell_h_
#include "nsIPresShell.h"
#include "nsStubDocumentObserver.h"
#include "nsISelectionController.h"
#include "nsIObserver.h"
#include "nsWeakReference.h"
#include "nsCRT.h"
#include "nsAutoPtr.h"
#include "nsIWidget.h"
#include "nsStyleSet.h"
#include "nsPresArena.h"
#include "nsFrameSelection.h"
#include "nsGUIEvent.h"
#include "nsContentUtils.h"
#include "nsRefreshDriver.h"
class nsRange;
class nsIDragService;
class nsCSSStyleSheet;
struct RangePaintInfo;
struct nsCallbackEventRequest;
#ifdef MOZ_REFLOW_PERF
class ReflowCountMgr;
#endif
#define STACK_ARENA_MARK_INCREMENT 50
/* a bit under 4096, for malloc overhead */
#define STACK_ARENA_BLOCK_INCREMENT 4044
/**A block of memory that the stack will
* chop up and hand out
*/
struct StackBlock {
// a block of memory. Note that this must be first so that it will
// be aligned.
char mBlock[STACK_ARENA_BLOCK_INCREMENT];
// another block of memory that would only be created
// if our stack overflowed. Yes we have the ability
// to grow on a stack overflow
StackBlock* mNext;
StackBlock() : mNext(nsnull) { }
~StackBlock() { }
};
/* we hold an array of marks. A push pushes a mark on the stack
* a pop pops it off.
*/
struct StackMark {
// the block of memory we are currently handing out chunks of
StackBlock* mBlock;
// our current position in the memory
size_t mPos;
};
/* A stack arena allows a stack based interface to a block of memory.
* It should be used when you need to allocate some temporary memory that
* you will immediately return.
*/
class StackArena {
public:
StackArena();
~StackArena();
nsresult Init() { return mBlocks ? NS_OK : NS_ERROR_OUT_OF_MEMORY; }
// Memory management functions
void* Allocate(size_t aSize);
void Push();
void Pop();
size_t SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const {
size_t n = 0;
StackBlock *block = mBlocks;
while (block) {
n += aMallocSizeOf(block, sizeof(StackBlock));
block = block->mNext;
}
n += aMallocSizeOf(mMarks, mMarkLength * sizeof(StackMark));
return n;
}
private:
// our current position in memory
size_t mPos;
// a list of memory block. Usually there is only one
// but if we overrun our stack size we can get more memory.
StackBlock* mBlocks;
// the current block of memory we are passing our chucks of
StackBlock* mCurBlock;
// our stack of mark where push has been called
StackMark* mMarks;
// the current top of the mark list
PRUint32 mStackTop;
// the size of the mark array
PRUint32 mMarkLength;
};
class nsPresShellEventCB;
class nsAutoCauseReflowNotifier;
class PresShell : public nsIPresShell,
public nsStubDocumentObserver,
public nsISelectionController, public nsIObserver,
public nsSupportsWeakReference
{
public:
PresShell();
NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
// nsISupports
NS_DECL_ISUPPORTS
// nsIPresShell
virtual NS_HIDDEN_(nsresult) Init(nsIDocument* aDocument,
nsPresContext* aPresContext,
nsIViewManager* aViewManager,
nsStyleSet* aStyleSet,
nsCompatibility aCompatMode);
virtual NS_HIDDEN_(void) Destroy();
virtual NS_HIDDEN_(void*) AllocateFrame(nsQueryFrame::FrameIID aCode,
size_t aSize);
virtual NS_HIDDEN_(void) FreeFrame(nsQueryFrame::FrameIID aCode,
void* aChunk);
virtual NS_HIDDEN_(void*) AllocateMisc(size_t aSize);
virtual NS_HIDDEN_(void) FreeMisc(size_t aSize, void* aChunk);
// Dynamic stack memory allocation
virtual NS_HIDDEN_(void) PushStackMemory();
virtual NS_HIDDEN_(void) PopStackMemory();
virtual NS_HIDDEN_(void*) AllocateStackMemory(size_t aSize);
virtual NS_HIDDEN_(nsresult) SetPreferenceStyleRules(bool aForceReflow);
NS_IMETHOD GetSelection(SelectionType aType, nsISelection** aSelection);
virtual nsISelection* GetCurrentSelection(SelectionType aType);
NS_IMETHOD SetDisplaySelection(PRInt16 aToggle);
NS_IMETHOD GetDisplaySelection(PRInt16 *aToggle);
NS_IMETHOD ScrollSelectionIntoView(SelectionType aType, SelectionRegion aRegion,
PRInt16 aFlags);
NS_IMETHOD RepaintSelection(SelectionType aType);
virtual NS_HIDDEN_(void) BeginObservingDocument();
virtual NS_HIDDEN_(void) EndObservingDocument();
virtual NS_HIDDEN_(nsresult) InitialReflow(nscoord aWidth, nscoord aHeight);
virtual NS_HIDDEN_(nsresult) ResizeReflow(nscoord aWidth, nscoord aHeight);
virtual NS_HIDDEN_(nsresult) ResizeReflowOverride(nscoord aWidth, nscoord aHeight);
virtual NS_HIDDEN_(void) StyleChangeReflow();
virtual NS_HIDDEN_(nsIPageSequenceFrame*) GetPageSequenceFrame() const;
virtual NS_HIDDEN_(nsIFrame*) GetRealPrimaryFrameFor(nsIContent* aContent) const;
virtual NS_HIDDEN_(nsIFrame*) GetPlaceholderFrameFor(nsIFrame* aFrame) const;
virtual NS_HIDDEN_(void) FrameNeedsReflow(nsIFrame *aFrame, IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd);
virtual NS_HIDDEN_(void) FrameNeedsToContinueReflow(nsIFrame *aFrame);
virtual NS_HIDDEN_(void) CancelAllPendingReflows();
virtual NS_HIDDEN_(bool) IsSafeToFlush() const;
virtual NS_HIDDEN_(void) FlushPendingNotifications(mozFlushType aType);
/**
* Recreates the frames for a node
*/
virtual NS_HIDDEN_(nsresult) RecreateFramesFor(nsIContent* aContent);
/**
* Post a callback that should be handled after reflow has finished.
*/
virtual NS_HIDDEN_(nsresult) PostReflowCallback(nsIReflowCallback* aCallback);
virtual NS_HIDDEN_(void) CancelReflowCallback(nsIReflowCallback* aCallback);
virtual NS_HIDDEN_(void) ClearFrameRefs(nsIFrame* aFrame);
virtual NS_HIDDEN_(already_AddRefed<nsRenderingContext>) GetReferenceRenderingContext();
virtual NS_HIDDEN_(nsresult) GoToAnchor(const nsAString& aAnchorName, bool aScroll);
virtual NS_HIDDEN_(nsresult) ScrollToAnchor();
virtual NS_HIDDEN_(nsresult) ScrollContentIntoView(nsIContent* aContent,
PRIntn aVPercent,
PRIntn aHPercent,
PRUint32 aFlags);
virtual bool ScrollFrameRectIntoView(nsIFrame* aFrame,
const nsRect& aRect,
PRIntn aVPercent,
PRIntn aHPercent,
PRUint32 aFlags);
virtual nsRectVisibility GetRectVisibility(nsIFrame *aFrame,
const nsRect &aRect,
nscoord aMinTwips) const;
virtual NS_HIDDEN_(void) SetIgnoreFrameDestruction(bool aIgnore);
virtual NS_HIDDEN_(void) NotifyDestroyingFrame(nsIFrame* aFrame);
virtual NS_HIDDEN_(nsresult) GetLinkLocation(nsIDOMNode* aNode, nsAString& aLocationString) const;
virtual NS_HIDDEN_(nsresult) CaptureHistoryState(nsILayoutHistoryState** aLayoutHistoryState, bool aLeavingPage);
virtual NS_HIDDEN_(void) UnsuppressPainting();
virtual nsresult GetAgentStyleSheets(nsCOMArray<nsIStyleSheet>& aSheets);
virtual nsresult SetAgentStyleSheets(const nsCOMArray<nsIStyleSheet>& aSheets);
virtual nsresult AddOverrideStyleSheet(nsIStyleSheet *aSheet);
virtual nsresult RemoveOverrideStyleSheet(nsIStyleSheet *aSheet);
virtual NS_HIDDEN_(nsresult) HandleEventWithTarget(nsEvent* aEvent, nsIFrame* aFrame,
nsIContent* aContent,
nsEventStatus* aStatus);
virtual NS_HIDDEN_(nsIFrame*) GetEventTargetFrame();
virtual NS_HIDDEN_(already_AddRefed<nsIContent>) GetEventTargetContent(nsEvent* aEvent);
virtual nsresult ReconstructFrames(void);
virtual void Freeze();
virtual void Thaw();
virtual void FireOrClearDelayedEvents(bool aFireEvents);
virtual nsIFrame* GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt);
virtual NS_HIDDEN_(nsresult) RenderDocument(const nsRect& aRect, PRUint32 aFlags,
nscolor aBackgroundColor,
gfxContext* aThebesContext);
virtual already_AddRefed<gfxASurface> RenderNode(nsIDOMNode* aNode,
nsIntRegion* aRegion,
nsIntPoint& aPoint,
nsIntRect* aScreenRect);
virtual already_AddRefed<gfxASurface> RenderSelection(nsISelection* aSelection,
nsIntPoint& aPoint,
nsIntRect* aScreenRect);
virtual already_AddRefed<nsPIDOMWindow> GetRootWindow();
virtual LayerManager* GetLayerManager();
virtual void SetIgnoreViewportScrolling(bool aIgnore);
virtual void SetDisplayPort(const nsRect& aDisplayPort);
virtual nsresult SetResolution(float aXResolution, float aYResolution);
//nsIViewObserver interface
virtual void Paint(nsIView* aViewToPaint, nsIWidget* aWidget,
const nsRegion& aDirtyRegion, const nsIntRegion& aIntDirtyRegion,
bool aPaintDefaultBackground, bool aWillSendDidPaint);
virtual nsresult HandleEvent(nsIFrame* aFrame,
nsGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus);
virtual NS_HIDDEN_(nsresult) HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsEvent* aEvent,
nsEventStatus* aStatus);
virtual NS_HIDDEN_(nsresult) HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsIDOMEvent* aEvent,
nsEventStatus* aStatus);
virtual bool ShouldIgnoreInvalidation();
virtual void WillPaint(bool aWillSendDidPaint);
virtual void DidPaint();
virtual void ScheduleViewManagerFlush();
virtual void DispatchSynthMouseMove(nsGUIEvent *aEvent, bool aFlushOnHoverChange);
virtual void ClearMouseCaptureOnView(nsIView* aView);
virtual bool IsVisible();
// caret handling
virtual NS_HIDDEN_(already_AddRefed<nsCaret>) GetCaret() const;
virtual NS_HIDDEN_(void) MaybeInvalidateCaretPosition();
NS_IMETHOD SetCaretEnabled(bool aInEnable);
NS_IMETHOD SetCaretReadOnly(bool aReadOnly);
NS_IMETHOD GetCaretEnabled(bool *aOutEnabled);
NS_IMETHOD SetCaretVisibilityDuringSelection(bool aVisibility);
NS_IMETHOD GetCaretVisible(bool *_retval);
virtual void SetCaret(nsCaret *aNewCaret);
virtual void RestoreCaret();
NS_IMETHOD SetSelectionFlags(PRInt16 aInEnable);
NS_IMETHOD GetSelectionFlags(PRInt16 *aOutEnable);
// nsISelectionController
NS_IMETHOD CharacterMove(bool aForward, bool aExtend);
NS_IMETHOD CharacterExtendForDelete();
NS_IMETHOD CharacterExtendForBackspace();
NS_IMETHOD WordMove(bool aForward, bool aExtend);
NS_IMETHOD WordExtendForDelete(bool aForward);
NS_IMETHOD LineMove(bool aForward, bool aExtend);
NS_IMETHOD IntraLineMove(bool aForward, bool aExtend);
NS_IMETHOD PageMove(bool aForward, bool aExtend);
NS_IMETHOD ScrollPage(bool aForward);
NS_IMETHOD ScrollLine(bool aForward);
NS_IMETHOD ScrollCharacter(bool aRight);
NS_IMETHOD CompleteScroll(bool aForward);
NS_IMETHOD CompleteMove(bool aForward, bool aExtend);
NS_IMETHOD SelectAll();
NS_IMETHOD CheckVisibility(nsIDOMNode *node, PRInt16 startOffset, PRInt16 EndOffset, bool *_retval);
virtual nsresult CheckVisibilityContent(nsIContent* aNode, PRInt16 aStartOffset,
PRInt16 aEndOffset, bool* aRetval);
// nsIDocumentObserver
NS_DECL_NSIDOCUMENTOBSERVER_BEGINUPDATE
NS_DECL_NSIDOCUMENTOBSERVER_ENDUPDATE
NS_DECL_NSIDOCUMENTOBSERVER_BEGINLOAD
NS_DECL_NSIDOCUMENTOBSERVER_ENDLOAD
NS_DECL_NSIDOCUMENTOBSERVER_CONTENTSTATECHANGED
NS_DECL_NSIDOCUMENTOBSERVER_DOCUMENTSTATESCHANGED
NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETADDED
NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETREMOVED
NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETAPPLICABLESTATECHANGED
NS_DECL_NSIDOCUMENTOBSERVER_STYLERULECHANGED
NS_DECL_NSIDOCUMENTOBSERVER_STYLERULEADDED
NS_DECL_NSIDOCUMENTOBSERVER_STYLERULEREMOVED
// nsIMutationObserver
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
NS_DECL_NSIOBSERVER
#ifdef MOZ_REFLOW_PERF
virtual NS_HIDDEN_(void) DumpReflows();
virtual NS_HIDDEN_(void) CountReflows(const char * aName, nsIFrame * aFrame);
virtual NS_HIDDEN_(void) PaintCount(const char * aName,
nsRenderingContext* aRenderingContext,
nsPresContext* aPresContext,
nsIFrame * aFrame,
const nsPoint& aOffset,
PRUint32 aColor);
virtual NS_HIDDEN_(void) SetPaintFrameCount(bool aOn);
virtual bool IsPaintingFrameCounts();
#endif
#ifdef DEBUG
virtual void ListStyleContexts(nsIFrame *aRootFrame, FILE *out,
PRInt32 aIndent = 0);
virtual void ListStyleSheets(FILE *out, PRInt32 aIndent = 0);
virtual void VerifyStyleTree();
#endif
#ifdef PR_LOGGING
static PRLogModuleInfo* gLog;
#endif
virtual NS_HIDDEN_(void) DisableNonTestMouseEvents(bool aDisable);
virtual void UpdateCanvasBackground();
virtual nsresult AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds,
nscolor aBackstopColor,
PRUint32 aFlags);
virtual nsresult AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds);
virtual nscolor ComputeBackstopColor(nsIView* aDisplayRoot);
virtual NS_HIDDEN_(nsresult) SetIsActive(bool aIsActive);
virtual bool GetIsViewportOverridden() { return mViewportOverridden; }
virtual bool IsLayoutFlushObserver()
{
return GetPresContext()->RefreshDriver()->
IsLayoutFlushObserver(this);
}
protected:
virtual ~PresShell();
void HandlePostedReflowCallbacks(bool aInterruptible);
void CancelPostedReflowCallbacks();
void UnsuppressAndInvalidate();
void WillCauseReflow() {
nsContentUtils::AddScriptBlocker();
++mChangeNestCount;
}
nsresult DidCauseReflow();
friend class nsAutoCauseReflowNotifier;
bool TouchesAreEqual(nsIDOMTouch *aTouch1, nsIDOMTouch *aTouch2);
void DispatchTouchEvent(nsEvent *aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB,
bool aTouchIsNew);
void WillDoReflow();
void DidDoReflow(bool aInterruptible);
// ProcessReflowCommands returns whether we processed all our dirty roots
// without interruptions.
bool ProcessReflowCommands(bool aInterruptible);
// MaybeScheduleReflow checks if posting a reflow is needed, then checks if
// the last reflow was interrupted. In the interrupted case ScheduleReflow is
// called off a timer, otherwise it is called directly.
void MaybeScheduleReflow();
// Actually schedules a reflow. This should only be called by
// MaybeScheduleReflow and the reflow timer ScheduleReflowOffTimer
// sets up.
void ScheduleReflow();
// Reflow regardless of whether the override bit has been set.
nsresult ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight);
// DoReflow returns whether the reflow finished without interruption
bool DoReflow(nsIFrame* aFrame, bool aInterruptible);
#ifdef DEBUG
void DoVerifyReflow();
void VerifyHasDirtyRootAncestor(nsIFrame* aFrame);
#endif
// Helper for ScrollContentIntoView
void DoScrollContentIntoView(nsIContent* aContent,
PRIntn aVPercent,
PRIntn aHPercent,
PRUint32 aFlags);
friend struct AutoRenderingStateSaveRestore;
friend struct RenderingState;
struct RenderingState {
RenderingState(PresShell* aPresShell)
: mRenderFlags(aPresShell->mRenderFlags)
, mXResolution(aPresShell->mXResolution)
, mYResolution(aPresShell->mYResolution)
{ }
PRUint32 mRenderFlags;
float mXResolution;
float mYResolution;
};
struct AutoSaveRestoreRenderingState {
AutoSaveRestoreRenderingState(PresShell* aPresShell)
: mPresShell(aPresShell)
, mOldState(aPresShell)
{}
~AutoSaveRestoreRenderingState()
{
mPresShell->mRenderFlags = mOldState.mRenderFlags;
mPresShell->mXResolution = mOldState.mXResolution;
mPresShell->mYResolution = mOldState.mYResolution;
}
PresShell* mPresShell;
RenderingState mOldState;
};
void SetRenderingState(const RenderingState& aState);
friend class nsPresShellEventCB;
bool mCaretEnabled;
#ifdef NS_DEBUG
nsStyleSet* CloneStyleSet(nsStyleSet* aSet);
bool VerifyIncrementalReflow();
bool mInVerifyReflow;
void ShowEventTargetDebug();
#endif
/**
* methods that manage rules that are used to implement the associated preferences
* - initially created for bugs 31816, 20760, 22963
*/
nsresult ClearPreferenceStyleRules(void);
nsresult CreatePreferenceStyleSheet(void);
nsresult SetPrefLinkRules(void);
nsresult SetPrefFocusRules(void);
nsresult SetPrefNoScriptRule();
nsresult SetPrefNoFramesRule(void);
// methods for painting a range to an offscreen buffer
// given a display list, clip the items within the list to
// the range
nsRect ClipListToRange(nsDisplayListBuilder *aBuilder,
nsDisplayList* aList,
nsRange* aRange);
// create a RangePaintInfo for the range aRange containing the
// display list needed to paint the range to a surface
RangePaintInfo* CreateRangePaintInfo(nsIDOMRange* aRange,
nsRect& aSurfaceRect,
bool aForPrimarySelection);
/*
* Paint the items to a new surface and return it.
*
* aSelection - selection being painted, if any
* aRegion - clip region, if any
* aArea - area that the surface occupies, relative to the root frame
* aPoint - reference point, typically the mouse position
* aScreenRect - [out] set to the area of the screen the painted area should
* be displayed at
*/
already_AddRefed<gfxASurface>
PaintRangePaintInfo(nsTArray<nsAutoPtr<RangePaintInfo> >* aItems,
nsISelection* aSelection,
nsIntRegion* aRegion,
nsRect aArea,
nsIntPoint& aPoint,
nsIntRect* aScreenRect);
/**
* Methods to handle changes to user and UA sheet lists that we get
* notified about.
*/
void AddUserSheet(nsISupports* aSheet);
void AddAgentSheet(nsISupports* aSheet);
void RemoveSheet(nsStyleSet::sheetType aType, nsISupports* aSheet);
// Hide a view if it is a popup
void HideViewIfPopup(nsIView* aView);
// Utility method to restore the root scrollframe state
void RestoreRootScrollPosition();
void MaybeReleaseCapturingContent()
{
nsRefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (frameSelection) {
frameSelection->SetMouseDownState(false);
}
if (gCaptureInfo.mContent &&
gCaptureInfo.mContent->OwnerDoc() == mDocument) {
SetCapturingContent(nsnull, 0);
}
}
nsresult HandleRetargetedEvent(nsEvent* aEvent, nsEventStatus* aStatus, nsIContent* aTarget)
{
PushCurrentEventInfo(nsnull, nsnull);
mCurrentEventContent = aTarget;
nsresult rv = NS_OK;
if (GetCurrentEventFrame()) {
rv = HandleEventInternal(aEvent, aStatus);
}
PopCurrentEventInfo();
return rv;
}
nsRefPtr<nsCSSStyleSheet> mPrefStyleSheet; // mStyleSet owns it but we
// maintain a ref, may be null
#ifdef DEBUG
PRUint32 mUpdateCount;
#endif
// reflow roots that need to be reflowed, as both a queue and a hashtable
nsTArray<nsIFrame*> mDirtyRoots;
bool mDocumentLoading;
bool mIgnoreFrameDestruction;
bool mHaveShutDown;
bool mViewportOverridden;
bool mLastRootReflowHadUnconstrainedHeight;
// This is used to protect ourselves from triggering reflow while in the
// middle of frame construction and the like... it really shouldn't be
// needed, one hopes, but it is for now.
PRUint32 mChangeNestCount;
nsIFrame* mCurrentEventFrame;
nsCOMPtr<nsIContent> mCurrentEventContent;
nsTArray<nsIFrame*> mCurrentEventFrameStack;
nsCOMArray<nsIContent> mCurrentEventContentStack;
nsCOMPtr<nsIContent> mLastAnchorScrolledTo;
nscoord mLastAnchorScrollPositionY;
nsRefPtr<nsCaret> mCaret;
nsRefPtr<nsCaret> mOriginalCaret;
nsPresArena mFrameArena;
StackArena mStackArena;
nsCOMPtr<nsIDragService> mDragService;
#ifdef DEBUG
// The reflow root under which we're currently reflowing. Null when
// not in reflow.
nsIFrame* mCurrentReflowRoot;
#endif
// Set of frames that we should mark with NS_FRAME_HAS_DIRTY_CHILDREN after
// we finish reflowing mCurrentReflowRoot.
nsTHashtable< nsPtrHashKey<nsIFrame> > mFramesToDirty;
// Information needed to properly handle scrolling content into view if the
// pre-scroll reflow flush can be interrupted. mContentToScrollTo is
// non-null between the initial scroll attempt and the first time we finish
// processing all our dirty roots. mContentScrollVPosition and
// mContentScrollHPosition are only used when it's non-null.
nsCOMPtr<nsIContent> mContentToScrollTo;
PRIntn mContentScrollVPosition;
PRIntn mContentScrollHPosition;
PRUint32 mContentToScrollToFlags;
class nsDelayedEvent
{
public:
virtual ~nsDelayedEvent() {};
virtual void Dispatch(PresShell* aShell) {}
};
class nsDelayedInputEvent : public nsDelayedEvent
{
public:
virtual void Dispatch(PresShell* aShell)
{
if (mEvent && mEvent->widget) {
nsCOMPtr<nsIWidget> w = mEvent->widget;
nsEventStatus status;
w->DispatchEvent(mEvent, status);
}
}
protected:
void Init(nsInputEvent* aEvent)
{
mEvent->time = aEvent->time;
mEvent->refPoint = aEvent->refPoint;
mEvent->isShift = aEvent->isShift;
mEvent->isControl = aEvent->isControl;
mEvent->isAlt = aEvent->isAlt;
mEvent->isMeta = aEvent->isMeta;
}
nsDelayedInputEvent()
: nsDelayedEvent(), mEvent(nsnull) {}
nsInputEvent* mEvent;
};
class nsDelayedMouseEvent : public nsDelayedInputEvent
{
public:
nsDelayedMouseEvent(nsMouseEvent* aEvent) : nsDelayedInputEvent()
{
mEvent = new nsMouseEvent(NS_IS_TRUSTED_EVENT(aEvent),
aEvent->message,
aEvent->widget,
aEvent->reason,
aEvent->context);
Init(aEvent);
static_cast<nsMouseEvent*>(mEvent)->clickCount = aEvent->clickCount;
}
virtual ~nsDelayedMouseEvent()
{
delete static_cast<nsMouseEvent*>(mEvent);
}
};
class nsDelayedKeyEvent : public nsDelayedInputEvent
{
public:
nsDelayedKeyEvent(nsKeyEvent* aEvent) : nsDelayedInputEvent()
{
mEvent = new nsKeyEvent(NS_IS_TRUSTED_EVENT(aEvent),
aEvent->message,
aEvent->widget);
Init(aEvent);
static_cast<nsKeyEvent*>(mEvent)->keyCode = aEvent->keyCode;
static_cast<nsKeyEvent*>(mEvent)->charCode = aEvent->charCode;
static_cast<nsKeyEvent*>(mEvent)->alternativeCharCodes =
aEvent->alternativeCharCodes;
static_cast<nsKeyEvent*>(mEvent)->isChar = aEvent->isChar;
}
virtual ~nsDelayedKeyEvent()
{
delete static_cast<nsKeyEvent*>(mEvent);
}
};
bool mNoDelayedMouseEvents;
bool mNoDelayedKeyEvents;
nsTArray<nsAutoPtr<nsDelayedEvent> > mDelayedEvents;
nsCallbackEventRequest* mFirstCallbackEventRequest;
nsCallbackEventRequest* mLastCallbackEventRequest;
bool mIsDocumentGone; // We've been disconnected from the document.
// We will refuse to paint the document until either
// (a) our timer fires or (b) all frames are constructed.
bool mShouldUnsuppressPainting; // Indicates that it is safe to unlock painting once all pending
// reflows have been processed.
nsCOMPtr<nsITimer> mPaintSuppressionTimer; // This timer controls painting suppression. Until it fires
// or all frames are constructed, we won't paint anything but
// our <body> background and scrollbars.
#define PAINTLOCK_EVENT_DELAY 250 // 250ms. This is actually
// pref-controlled, but we use this
// value if we fail to get the pref
// for any reason.
static void sPaintSuppressionCallback(nsITimer* aTimer, void* aPresShell); // A callback for the timer.
// At least on Win32 and Mac after interupting a reflow we need to post
// the resume reflow event off a timer to avoid event starvation because
// posted messages are processed before other messages when the modal
// moving/sizing loop is running, see bug 491700 for details.
nsCOMPtr<nsITimer> mReflowContinueTimer;
static void sReflowContinueCallback(nsITimer* aTimer, void* aPresShell);
bool ScheduleReflowOffTimer();
#ifdef MOZ_REFLOW_PERF
ReflowCountMgr * mReflowCountMgr;
#endif
static bool sDisableNonTestMouseEvents;
private:
bool InZombieDocument(nsIContent *aContent);
already_AddRefed<nsIPresShell> GetParentPresShell();
nsresult RetargetEventToParent(nsGUIEvent* aEvent,
nsEventStatus* aEventStatus);
//helper funcs for event handling
protected:
//protected because nsPresShellEventCB needs this.
nsIFrame* GetCurrentEventFrame();
private:
void PushCurrentEventInfo(nsIFrame* aFrame, nsIContent* aContent);
void PopCurrentEventInfo();
nsresult HandleEventInternal(nsEvent* aEvent, nsEventStatus *aStatus);
nsresult HandlePositionedEvent(nsIFrame* aTargetFrame,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus);
// This returns the focused DOM window under our top level window.
// I.e., when we are deactive, this returns the *last* focused DOM window.
already_AddRefed<nsPIDOMWindow> GetFocusedDOMWindowInOurWindow();
/*
* This and the next two helper methods are used to target and position the
* context menu when the keyboard shortcut is used to open it.
*
* If another menu is open, the context menu is opened relative to the
* active menuitem within the menu, or the menu itself if no item is active.
* Otherwise, if the caret is visible, the menu is opened near the caret.
* Otherwise, if a selectable list such as a listbox is focused, the
* current item within the menu is opened relative to this item.
* Otherwise, the context menu is opened at the topleft corner of the
* view.
*
* Returns true if the context menu event should fire and false if it should
* not.
*/
bool AdjustContextMenuKeyEvent(nsMouseEvent* aEvent);
//
bool PrepareToUseCaretPosition(nsIWidget* aEventWidget, nsIntPoint& aTargetPt);
// Get the selected item and coordinates in device pixels relative to root
// document's root view for element, first ensuring the element is onscreen
void GetCurrentItemAndPositionForElement(nsIDOMElement *aCurrentEl,
nsIContent **aTargetToUse,
nsIntPoint& aTargetPt,
nsIWidget *aRootWidget);
void FireResizeEvent();
void FireBeforeResizeEvent();
static void AsyncResizeEventCallback(nsITimer* aTimer, void* aPresShell);
nsRevocableEventPtr<nsRunnableMethod<PresShell> > mResizeEvent;
nsCOMPtr<nsITimer> mAsyncResizeEventTimer;
bool mAsyncResizeTimerIsActive;
bool mInResize;
virtual void SynthesizeMouseMove(bool aFromScroll);
// Check if aEvent is a mouse event and record the mouse location for later
// synth mouse moves.
void RecordMouseLocation(nsGUIEvent* aEvent);
// This is used for synthetic mouse events that are sent when what is under
// the mouse pointer may have changed without the mouse moving (eg scrolling,
// change to the document contents).
// It is set only on a presshell for a root document, this value represents
// the last observed location of the mouse relative to that root document. It
// is set to (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if the mouse isn't
// over our window or there is no last observed mouse location for some
// reason.
nsPoint mMouseLocation;
class nsSynthMouseMoveEvent : public nsARefreshObserver {
public:
nsSynthMouseMoveEvent(PresShell* aPresShell, bool aFromScroll)
: mPresShell(aPresShell), mFromScroll(aFromScroll) {
NS_ASSERTION(mPresShell, "null parameter");
}
~nsSynthMouseMoveEvent() {
Revoke();
}
NS_INLINE_DECL_REFCOUNTING(nsSynthMouseMoveEvent)
void Revoke() {
if (mPresShell) {
mPresShell->GetPresContext()->RefreshDriver()->
RemoveRefreshObserver(this, Flush_Display);
mPresShell = nsnull;
}
}
virtual void WillRefresh(mozilla::TimeStamp aTime) {
if (mPresShell)
mPresShell->ProcessSynthMouseMoveEvent(mFromScroll);
}
private:
PresShell* mPresShell;
bool mFromScroll;
};
nsRevocableEventPtr<nsSynthMouseMoveEvent> mSynthMouseMoveEvent;
void ProcessSynthMouseMoveEvent(bool aFromScroll);
PresShell* GetRootPresShell();
private:
#ifdef DEBUG
// Ensure that every allocation from the PresArena is eventually freed.
PRUint32 mPresArenaAllocCount;
#endif
public:
size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const {
size_t n = 0;
n += aMallocSizeOf(this, sizeof(PresShell));
n += mStackArena.SizeOfExcludingThis(aMallocSizeOf);
n += mFrameArena.SizeOfExcludingThis(aMallocSizeOf);
return n;
}
size_t SizeOfTextRuns(nsMallocSizeOfFun aMallocSizeOf);
class MemoryReporter : public nsIMemoryMultiReporter
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIMEMORYMULTIREPORTER
protected:
static PLDHashOperator SizeEnumerator(PresShellPtrKey *aEntry, void *userArg);
};
protected:
void QueryIsActive();
nsresult UpdateImageLockingState();
private:
nscolor GetDefaultBackgroundColorToDraw();
};
#endif /* !defined(nsPresShell_h_) */
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