/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* 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/.
*
* 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 */
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/Likely.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/Util.h"
#include <algorithm>
#ifdef XP_WIN
#include "winuser.h"
#endif
#include "nsPresShell.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "mozilla/dom/Element.h"
#include "nsIDocument.h"
#include "nsCSSStyleSheet.h"
#include "nsAnimationManager.h"
#include "nsINameSpaceManager.h" // for Pref-related rule management (bugs 22963,20760,31816)
#include "nsFrame.h"
#include "FrameLayerBuilder.h"
#include "nsViewManager.h"
#include "nsView.h"
#include "nsCRTGlue.h"
#include "prlog.h"
#include "prprf.h"
#include "prinrval.h"
#include "nsTArray.h"
#include "nsCOMArray.h"
#include "nsContainerFrame.h"
#include "nsDOMEvent.h"
#include "nsISelection.h"
#include "mozilla/Selection.h"
#include "nsGkAtoms.h"
#include "nsIDOMRange.h"
#include "nsIDOMDocument.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMElement.h"
#include "nsRange.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsReadableUtils.h"
#include "nsIPageSequenceFrame.h"
#include "nsCaret.h"
#include "nsIDOMHTMLDocument.h"
#include "nsFrameManager.h"
#include "nsEventStateManager.h"
#include "nsIMEStateManager.h"
#include "nsXPCOM.h"
#include "nsILayoutHistoryState.h"
#include "nsILineIterator.h" // for ScrollContentIntoView
#include "pldhash.h"
#include "mozilla/dom/Touch.h"
#include "nsIObserverService.h"
#include "nsIDocShell.h" // for reflow observation
#include "nsIBaseWindow.h"
#include "nsError.h"
#include "nsLayoutUtils.h"
#include "nsViewportInfo.h"
#include "nsCSSRendering.h"
// for |#ifdef DEBUG| code
#include "prenv.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsRenderingContext.h"
#include "nsAutoLayoutPhase.h"
#ifdef MOZ_REFLOW_PERF
#include "nsFontMetrics.h"
#endif
#include "PositionedEventTargeting.h"
#include "nsIReflowCallback.h"
#include "nsPIDOMWindow.h"
#include "nsFocusManager.h"
#include "nsIObjectFrame.h"
#include "nsIObjectLoadingContent.h"
#include "nsNetUtil.h"
#include "nsEventDispatcher.h"
#include "nsThreadUtils.h"
#include "nsStyleSheetService.h"
#include "gfxImageSurface.h"
#include "gfxContext.h"
#include "nsSMILAnimationController.h"
#include "SVGContentUtils.h"
#include "nsSVGEffects.h"
#include "SVGFragmentIdentifier.h"
#include "nsPerformance.h"
#include "nsRefreshDriver.h"
#include "nsDOMNavigationTiming.h"
// Drag & Drop, Clipboard
#include "nsIDocShellTreeItem.h"
#include "nsIURI.h"
#include "nsIScrollableFrame.h"
#include "nsITimer.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#include "mozilla/a11y/DocAccessible.h"
#ifdef DEBUG
#include "mozilla/a11y/Logging.h"
#endif
#endif
// For style data reconstruction
#include "nsStyleChangeList.h"
#include "nsCSSFrameConstructor.h"
#ifdef MOZ_XUL
#include "nsMenuFrame.h"
#include "nsTreeBodyFrame.h"
#include "nsIBoxObject.h"
#include "nsITreeBoxObject.h"
#include "nsMenuPopupFrame.h"
#include "nsITreeColumns.h"
#include "nsIDOMXULMultSelectCntrlEl.h"
#include "nsIDOMXULSelectCntrlItemEl.h"
#include "nsIDOMXULMenuListElement.h"
#endif
#include "GeckoProfiler.h"
#include "gfxPlatform.h"
#include "Layers.h"
#include "LayerTreeInvalidation.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "nsCanvasFrame.h"
#include "nsIImageLoadingContent.h"
#include "nsIScreen.h"
#include "nsIScreenManager.h"
#include "nsPlaceholderFrame.h"
#include "nsTransitionManager.h"
#include "RestyleManager.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDragSession.h"
#include "nsIFrameInlines.h"
#ifdef ANDROID
#include "nsIDocShellTreeOwner.h"
#endif
#define ANCHOR_SCROLL_FLAGS \
(nsIPresShell::SCROLL_OVERFLOW_HIDDEN | nsIPresShell::SCROLL_NO_PARENT_FRAMES)
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::layers;
CapturingContentInfo nsIPresShell::gCaptureInfo =
{ false /* mAllowed */, false /* mPointerLock */, false /* mRetargetToElement */,
false /* mPreventDrag */, nullptr /* mContent */ };
nsIContent* nsIPresShell::gKeyDownTarget;
nsRefPtrHashtable<nsUint32HashKey, dom::Touch>* nsIPresShell::gCaptureTouchList;
bool nsIPresShell::gPreventMouseEvents = false;
// convert a color value to a string, in the CSS format #RRGGBB
// * - initially created for bugs 31816, 20760, 22963
static void ColorToString(nscolor aColor, nsAutoString &aString);
// RangePaintInfo is used to paint ranges to offscreen buffers
struct RangePaintInfo {
nsRefPtr<nsRange> mRange;
nsDisplayListBuilder mBuilder;
nsDisplayList mList;
// offset of builder's reference frame to the root frame
nsPoint mRootOffset;
RangePaintInfo(nsRange* aRange, nsIFrame* aFrame)
: mRange(aRange), mBuilder(aFrame, nsDisplayListBuilder::PAINTING, false)
{
MOZ_COUNT_CTOR(RangePaintInfo);
}
~RangePaintInfo()
{
mList.DeleteAll();
MOZ_COUNT_DTOR(RangePaintInfo);
}
};
#undef NOISY
// ----------------------------------------------------------------------
#ifdef DEBUG
// Set the environment variable GECKO_VERIFY_REFLOW_FLAGS to one or
// more of the following flags (comma separated) for handy debug
// output.
static uint32_t gVerifyReflowFlags;
struct VerifyReflowFlags {
const char* name;
uint32_t bit;
};
static const VerifyReflowFlags gFlags[] = {
{ "verify", VERIFY_REFLOW_ON },
{ "reflow", VERIFY_REFLOW_NOISY },
{ "all", VERIFY_REFLOW_ALL },
{ "list-commands", VERIFY_REFLOW_DUMP_COMMANDS },
{ "noisy-commands", VERIFY_REFLOW_NOISY_RC },
{ "really-noisy-commands", VERIFY_REFLOW_REALLY_NOISY_RC },
{ "resize", VERIFY_REFLOW_DURING_RESIZE_REFLOW },
};
#define NUM_VERIFY_REFLOW_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
static void
ShowVerifyReflowFlags()
{
printf("Here are the available GECKO_VERIFY_REFLOW_FLAGS:\n");
const VerifyReflowFlags* flag = gFlags;
const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
printf(" %s\n", flag->name);
++flag;
}
printf("Note: GECKO_VERIFY_REFLOW_FLAGS is a comma separated list of flag\n");
printf("names (no whitespace)\n");
}
#endif
//========================================================================
//========================================================================
//========================================================================
#ifdef MOZ_REFLOW_PERF
class ReflowCountMgr;
static const char kGrandTotalsStr[] = "Grand Totals";
// Counting Class
class ReflowCounter {
public:
ReflowCounter(ReflowCountMgr * aMgr = nullptr);
~ReflowCounter();
void ClearTotals();
void DisplayTotals(const char * aStr);
void DisplayDiffTotals(const char * aStr);
void DisplayHTMLTotals(const char * aStr);
void Add() { mTotal++; }
void Add(uint32_t aTotal) { mTotal += aTotal; }
void CalcDiffInTotals();
void SetTotalsCache();
void SetMgr(ReflowCountMgr * aMgr) { mMgr = aMgr; }
uint32_t GetTotal() { return mTotal; }
protected:
void DisplayTotals(uint32_t aTotal, const char * aTitle);
void DisplayHTMLTotals(uint32_t aTotal, const char * aTitle);
uint32_t mTotal;
uint32_t mCacheTotal;
ReflowCountMgr * mMgr; // weak reference (don't delete)
};
// Counting Class
class IndiReflowCounter {
public:
IndiReflowCounter(ReflowCountMgr * aMgr = nullptr)
: mFrame(nullptr),
mCount(0),
mMgr(aMgr),
mCounter(aMgr),
mHasBeenOutput(false)
{}
virtual ~IndiReflowCounter() {}
nsAutoString mName;
nsIFrame * mFrame; // weak reference (don't delete)
int32_t mCount;
ReflowCountMgr * mMgr; // weak reference (don't delete)
ReflowCounter mCounter;
bool mHasBeenOutput;
};
//--------------------
// Manager Class
//--------------------
class ReflowCountMgr {
public:
ReflowCountMgr();
virtual ~ReflowCountMgr();
void ClearTotals();
void ClearGrandTotals();
void DisplayTotals(const char * aStr);
void DisplayHTMLTotals(const char * aStr);
void DisplayDiffsInTotals(const char * aStr);
void Add(const char * aName, nsIFrame * aFrame);
ReflowCounter * LookUp(const char * aName);
void PaintCount(const char *aName, nsRenderingContext* aRenderingContext,
nsPresContext *aPresContext, nsIFrame *aFrame,
const nsPoint &aOffset, uint32_t aColor);
FILE * GetOutFile() { return mFD; }
PLHashTable * GetIndiFrameHT() { return mIndiFrameCounts; }
void SetPresContext(nsPresContext * aPresContext) { mPresContext = aPresContext; } // weak reference
void SetPresShell(nsIPresShell* aPresShell) { mPresShell= aPresShell; } // weak reference
void SetDumpFrameCounts(bool aVal) { mDumpFrameCounts = aVal; }
void SetDumpFrameByFrameCounts(bool aVal) { mDumpFrameByFrameCounts = aVal; }
void SetPaintFrameCounts(bool aVal) { mPaintFrameByFrameCounts = aVal; }
bool IsPaintingFrameCounts() { return mPaintFrameByFrameCounts; }
protected:
void DisplayTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
void DisplayHTMLTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
static int RemoveItems(PLHashEntry *he, int i, void *arg);
static int RemoveIndiItems(PLHashEntry *he, int i, void *arg);
void CleanUp();
// stdout Output Methods
static int DoSingleTotal(PLHashEntry *he, int i, void *arg);
static int DoSingleIndi(PLHashEntry *he, int i, void *arg);
void DoGrandTotals();
void DoIndiTotalsTree();
// HTML Output Methods
static int DoSingleHTMLTotal(PLHashEntry *he, int i, void *arg);
void DoGrandHTMLTotals();
// Zero Out the Totals
static int DoClearTotals(PLHashEntry *he, int i, void *arg);
// Displays the Diff Totals
static int DoDisplayDiffTotals(PLHashEntry *he, int i, void *arg);
PLHashTable * mCounts;
PLHashTable * mIndiFrameCounts;
FILE * mFD;
bool mDumpFrameCounts;
bool mDumpFrameByFrameCounts;
bool mPaintFrameByFrameCounts;
bool mCycledOnce;
// Root Frame for Individual Tracking
nsPresContext * mPresContext;
nsIPresShell* mPresShell;
// ReflowCountMgr gReflowCountMgr;
};
#endif
//========================================================================
// comment out to hide caret
#define SHOW_CARET
// The upper bound on the amount of time to spend reflowing, in
// microseconds. When this bound is exceeded and reflow commands are
// still queued up, a reflow event is posted. The idea is for reflow
// to not hog the processor beyond the time specifed in
// gMaxRCProcessingTime. This data member is initialized from the
// layout.reflow.timeslice pref.
#define NS_MAX_REFLOW_TIME 1000000
static int32_t gMaxRCProcessingTime = -1;
struct nsCallbackEventRequest
{
nsIReflowCallback* callback;
nsCallbackEventRequest* next;
};
// ----------------------------------------------------------------------------
#define ASSERT_REFLOW_SCHEDULED_STATE() \
NS_ASSERTION(mReflowScheduled == \
GetPresContext()->RefreshDriver()-> \
IsLayoutFlushObserver(this), "Unexpected state")
class nsAutoCauseReflowNotifier
{
public:
nsAutoCauseReflowNotifier(PresShell* aShell)
: mShell(aShell)
{
mShell->WillCauseReflow();
}
~nsAutoCauseReflowNotifier()
{
// This check should not be needed. Currently the only place that seem
// to need it is the code that deals with bug 337586.
if (!mShell->mHaveShutDown) {
mShell->DidCauseReflow();
}
else {
nsContentUtils::RemoveScriptBlocker();
}
}
PresShell* mShell;
};
class MOZ_STACK_CLASS nsPresShellEventCB : public nsDispatchingCallback
{
public:
nsPresShellEventCB(PresShell* aPresShell) : mPresShell(aPresShell) {}
virtual void HandleEvent(nsEventChainPostVisitor& aVisitor)
{
if (aVisitor.mPresContext && aVisitor.mEvent->eventStructType != NS_EVENT) {
if (aVisitor.mEvent->message == NS_MOUSE_BUTTON_DOWN ||
aVisitor.mEvent->message == NS_MOUSE_BUTTON_UP) {
// Mouse-up and mouse-down events call nsFrame::HandlePress/Release
// which call GetContentOffsetsFromPoint which requires up-to-date layout.
// Bring layout up-to-date now so that GetCurrentEventFrame() below
// will return a real frame and we don't have to worry about
// destroying it by flushing later.
mPresShell->FlushPendingNotifications(Flush_Layout);
} else if (aVisitor.mEvent->message == NS_WHEEL_WHEEL &&
aVisitor.mEventStatus != nsEventStatus_eConsumeNoDefault) {
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (frame) {
// chrome (including addons) should be able to know if content
// handles both D3E "wheel" event and legacy mouse scroll events.
// We should dispatch legacy mouse events before dispatching the
// "wheel" event into system group.
nsRefPtr<nsEventStateManager> esm =
aVisitor.mPresContext->EventStateManager();
esm->DispatchLegacyMouseScrollEvents(frame,
static_cast<WidgetWheelEvent*>(aVisitor.mEvent),
&aVisitor.mEventStatus);
}
}
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (!frame &&
(aVisitor.mEvent->message == NS_MOUSE_BUTTON_UP ||
aVisitor.mEvent->message == NS_TOUCH_END)) {
// Redirect BUTTON_UP and TOUCH_END events to the root frame to ensure
// that capturing is released.
frame = mPresShell->GetRootFrame();
}
if (frame) {
frame->HandleEvent(aVisitor.mPresContext,
static_cast<WidgetGUIEvent*>(aVisitor.mEvent),
&aVisitor.mEventStatus);
}
}
}
nsRefPtr<PresShell> mPresShell;
};
class nsBeforeFirstPaintDispatcher : public nsRunnable
{
public:
nsBeforeFirstPaintDispatcher(nsIDocument* aDocument)
: mDocument(aDocument) {}
// Fires the "before-first-paint" event so that interested parties (right now, the
// mobile browser) are aware of it.
NS_IMETHOD Run()
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(mDocument, "before-first-paint",
nullptr);
}
return NS_OK;
}
private:
nsCOMPtr<nsIDocument> mDocument;
};
bool PresShell::sDisableNonTestMouseEvents = false;
#ifdef PR_LOGGING
PRLogModuleInfo* PresShell::gLog;
#endif
#ifdef DEBUG
static void
VerifyStyleTree(nsPresContext* aPresContext, nsFrameManager* aFrameManager)
{
if (nsFrame::GetVerifyStyleTreeEnable()) {
nsIFrame* rootFrame = aFrameManager->GetRootFrame();
aPresContext->RestyleManager()->DebugVerifyStyleTree(rootFrame);
}
}
#define VERIFY_STYLE_TREE ::VerifyStyleTree(mPresContext, mFrameConstructor)
#else
#define VERIFY_STYLE_TREE
#endif
static bool gVerifyReflowEnabled;
bool
nsIPresShell::GetVerifyReflowEnable()
{
#ifdef DEBUG
static bool firstTime = true;
if (firstTime) {
firstTime = false;
char* flags = PR_GetEnv("GECKO_VERIFY_REFLOW_FLAGS");
if (flags) {
bool error = false;
for (;;) {
char* comma = PL_strchr(flags, ',');
if (comma)
*comma = '\0';
bool found = false;
const VerifyReflowFlags* flag = gFlags;
const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
if (PL_strcasecmp(flag->name, flags) == 0) {
gVerifyReflowFlags |= flag->bit;
found = true;
break;
}
++flag;
}
if (! found)
error = true;
if (! comma)
break;
*comma = ',';
flags = comma + 1;
}
if (error)
ShowVerifyReflowFlags();
}
if (VERIFY_REFLOW_ON & gVerifyReflowFlags) {
gVerifyReflowEnabled = true;
printf("Note: verifyreflow is enabled");
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf(" (noisy)");
}
if (VERIFY_REFLOW_ALL & gVerifyReflowFlags) {
printf(" (all)");
}
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf(" (show reflow commands)");
}
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
printf(" (noisy reflow commands)");
if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
printf(" (REALLY noisy reflow commands)");
}
}
printf("\n");
}
}
#endif
return gVerifyReflowEnabled;
}
void
PresShell::AddInvalidateHiddenPresShellObserver(nsRefreshDriver *aDriver)
{
if (!mHiddenInvalidationObserverRefreshDriver && !mIsDestroying && !mHaveShutDown) {
aDriver->AddPresShellToInvalidateIfHidden(this);
mHiddenInvalidationObserverRefreshDriver = aDriver;
}
}
void
nsIPresShell::InvalidatePresShellIfHidden()
{
if (!IsVisible() && mPresContext) {
mPresContext->NotifyInvalidation(0);
}
mHiddenInvalidationObserverRefreshDriver = nullptr;
}
void
nsIPresShell::SetVerifyReflowEnable(bool aEnabled)
{
gVerifyReflowEnabled = aEnabled;
}
/* virtual */ void
nsIPresShell::AddWeakFrameExternal(nsWeakFrame* aWeakFrame)
{
AddWeakFrameInternal(aWeakFrame);
}
void
nsIPresShell::AddWeakFrameInternal(nsWeakFrame* aWeakFrame)
{
if (aWeakFrame->GetFrame()) {
aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
}
aWeakFrame->SetPreviousWeakFrame(mWeakFrames);
mWeakFrames = aWeakFrame;
}
/* virtual */ void
nsIPresShell::RemoveWeakFrameExternal(nsWeakFrame* aWeakFrame)
{
RemoveWeakFrameInternal(aWeakFrame);
}
void
nsIPresShell::RemoveWeakFrameInternal(nsWeakFrame* aWeakFrame)
{
if (mWeakFrames == aWeakFrame) {
mWeakFrames = aWeakFrame->GetPreviousWeakFrame();
return;
}
nsWeakFrame* nextWeak = mWeakFrames;
while (nextWeak && nextWeak->GetPreviousWeakFrame() != aWeakFrame) {
nextWeak = nextWeak->GetPreviousWeakFrame();
}
if (nextWeak) {
nextWeak->SetPreviousWeakFrame(aWeakFrame->GetPreviousWeakFrame());
}
}
already_AddRefed<nsFrameSelection>
nsIPresShell::FrameSelection()
{
nsRefPtr<nsFrameSelection> ret = mSelection;
return ret.forget();
}
//----------------------------------------------------------------------
static bool sSynthMouseMove = true;
static uint32_t sNextPresShellId;
PresShell::PresShell()
: mMouseLocation(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)
{
mSelection = nullptr;
#ifdef MOZ_REFLOW_PERF
mReflowCountMgr = new ReflowCountMgr();
mReflowCountMgr->SetPresContext(mPresContext);
mReflowCountMgr->SetPresShell(this);
#endif
#ifdef PR_LOGGING
if (! gLog)
gLog = PR_NewLogModule("PresShell");
#endif
mSelectionFlags = nsISelectionDisplay::DISPLAY_TEXT | nsISelectionDisplay::DISPLAY_IMAGES;
mIsThemeSupportDisabled = false;
mIsActive = true;
// FIXME/bug 735029: find a better solution to this problem
#ifdef MOZ_ANDROID_OMTC
// The java pan/zoom code uses this to mean approximately "request a
// reset of pan/zoom state" which doesn't necessarily correspond
// with the first paint of content.
mIsFirstPaint = false;
#else
mIsFirstPaint = true;
#endif
mPresShellId = sNextPresShellId++;
mFrozen = false;
#ifdef DEBUG
mPresArenaAllocCount = 0;
#endif
mRenderFlags = 0;
mXResolution = 1.0;
mYResolution = 1.0;
mViewportOverridden = false;
mScrollPositionClampingScrollPortSizeSet = false;
mMaxLineBoxWidth = 0;
static bool addedSynthMouseMove = false;
if (!addedSynthMouseMove) {
Preferences::AddBoolVarCache(&sSynthMouseMove,
"layout.reflow.synthMouseMove", true);
addedSynthMouseMove = true;
}
}
NS_IMPL_ISUPPORTS7(PresShell, nsIPresShell, nsIDocumentObserver,
nsISelectionController,
nsISelectionDisplay, nsIObserver, nsISupportsWeakReference,
nsIMutationObserver)
PresShell::~PresShell()
{
if (!mHaveShutDown) {
NS_NOTREACHED("Someone did not call nsIPresShell::destroy");
Destroy();
}
NS_ASSERTION(mCurrentEventContentStack.Count() == 0,
"Huh, event content left on the stack in pres shell dtor!");
NS_ASSERTION(mFirstCallbackEventRequest == nullptr &&
mLastCallbackEventRequest == nullptr,
"post-reflow queues not empty. This means we're leaking");
#ifdef DEBUG
MOZ_ASSERT(mPresArenaAllocCount == 0,
"Some pres arena objects were not freed");
#endif
delete mStyleSet;
delete mFrameConstructor;
mCurrentEventContent = nullptr;
NS_IF_RELEASE(mPresContext);
NS_IF_RELEASE(mDocument);
NS_IF_RELEASE(mSelection);
}
/**
* Initialize the presentation shell. Create view manager and style
* manager.
* Note this can't be merged into our constructor because caret initialization
* calls AddRef() on us.
*/
void
PresShell::Init(nsIDocument* aDocument,
nsPresContext* aPresContext,
nsViewManager* aViewManager,
nsStyleSet* aStyleSet,
nsCompatibility aCompatMode)
{
NS_PRECONDITION(aDocument, "null ptr");
NS_PRECONDITION(aPresContext, "null ptr");
NS_PRECONDITION(aViewManager, "null ptr");
NS_PRECONDITION(!mDocument, "already initialized");
if (!aDocument || !aPresContext || !aViewManager || mDocument) {
return;
}
mDocument = aDocument;
NS_ADDREF(mDocument);
mViewManager = aViewManager;
// Create our frame constructor.
mFrameConstructor = new nsCSSFrameConstructor(mDocument, this, aStyleSet);
mFrameManager = mFrameConstructor;
// The document viewer owns both view manager and pres shell.
mViewManager->SetPresShell(this);
// Bind the context to the presentation shell.
mPresContext = aPresContext;
NS_ADDREF(mPresContext);
aPresContext->SetShell(this);
// Now we can initialize the style set.
aStyleSet->Init(aPresContext);
mStyleSet = aStyleSet;
// Notify our prescontext that it now has a compatibility mode. Note that
// this MUST happen after we set up our style set but before we create any
// frames.
mPresContext->CompatibilityModeChanged();
// setup the preference style rules (no forced reflow), and do it
// before creating any frames.
SetPreferenceStyleRules(false);
NS_ADDREF(mSelection = new nsFrameSelection());
mSelection->Init(this, nullptr);
// Important: this has to happen after the selection has been set up
#ifdef SHOW_CARET
// make the caret
mCaret = new nsCaret();
mCaret->Init(this);
mOriginalCaret = mCaret;
//SetCaretEnabled(true); // make it show in browser windows
#endif
//set up selection to be displayed in document
// Don't enable selection for print media
nsPresContext::nsPresContextType type = aPresContext->Type();
if (type != nsPresContext::eContext_PrintPreview &&
type != nsPresContext::eContext_Print)
SetDisplaySelection(nsISelectionController::SELECTION_DISABLED);
if (gMaxRCProcessingTime == -1) {
gMaxRCProcessingTime =
Preferences::GetInt("layout.reflow.timeslice", NS_MAX_REFLOW_TIME);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->AddObserver(this, "agent-sheet-added", false);
os->AddObserver(this, "user-sheet-added", false);
os->AddObserver(this, "author-sheet-added", false);
os->AddObserver(this, "agent-sheet-removed", false);
os->AddObserver(this, "user-sheet-removed", false);
os->AddObserver(this, "author-sheet-removed", false);
#ifdef MOZ_XUL
os->AddObserver(this, "chrome-flush-skin-caches", false);
#endif
}
}
#ifdef MOZ_REFLOW_PERF
if (mReflowCountMgr) {
bool paintFrameCounts =
Preferences::GetBool("layout.reflow.showframecounts");
bool dumpFrameCounts =
Preferences::GetBool("layout.reflow.dumpframecounts");
bool dumpFrameByFrameCounts =
Preferences::GetBool("layout.reflow.dumpframebyframecounts");
mReflowCountMgr->SetDumpFrameCounts(dumpFrameCounts);
mReflowCountMgr->SetDumpFrameByFrameCounts(dumpFrameByFrameCounts);
mReflowCountMgr->SetPaintFrameCounts(paintFrameCounts);
}
#endif
if (mDocument->HasAnimationController()) {
nsSMILAnimationController* animCtrl = mDocument->GetAnimationController();
animCtrl->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
}
// Get our activeness from the docShell.
QueryIsActive();
// Setup our font inflation preferences.
SetupFontInflation();
}
void
PresShell::Destroy()
{
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"destroy called on presshell while scripts not blocked");
#ifdef MOZ_REFLOW_PERF
DumpReflows();
if (mReflowCountMgr) {
delete mReflowCountMgr;
mReflowCountMgr = nullptr;
}
#endif
if (mHaveShutDown)
return;
#ifdef ACCESSIBILITY
if (mDocAccessible) {
#ifdef DEBUG
if (a11y::logging::IsEnabled(a11y::logging::eDocDestroy))
a11y::logging::DocDestroy("presshell destroyed", mDocument);
#endif
mDocAccessible->Shutdown();
mDocAccessible = nullptr;
}
#endif // ACCESSIBILITY
MaybeReleaseCapturingContent();
if (gKeyDownTarget && gKeyDownTarget->OwnerDoc() == mDocument) {
NS_RELEASE(gKeyDownTarget);
}
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
if (mPresContext) {
// We need to notify the destroying the nsPresContext to ESM for
// suppressing to use from ESM.
mPresContext->EventStateManager()->NotifyDestroyPresContext(mPresContext);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->RemoveObserver(this, "agent-sheet-added");
os->RemoveObserver(this, "user-sheet-added");
os->RemoveObserver(this, "author-sheet-added");
os->RemoveObserver(this, "agent-sheet-removed");
os->RemoveObserver(this, "user-sheet-removed");
os->RemoveObserver(this, "author-sheet-removed");
#ifdef MOZ_XUL
os->RemoveObserver(this, "chrome-flush-skin-caches");
#endif
}
}
// If our paint suppression timer is still active, kill it.
if (mPaintSuppressionTimer) {
mPaintSuppressionTimer->Cancel();
mPaintSuppressionTimer = nullptr;
}
// Same for our reflow continuation timer
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
mSynthMouseMoveEvent.Revoke();
mUpdateImageVisibilityEvent.Revoke();
ClearVisibleImagesList();
if (mCaret) {
mCaret->Terminate();
mCaret = nullptr;
}
if (mSelection) {
mSelection->DisconnectFromPresShell();
}
// release our pref style sheet, if we have one still
ClearPreferenceStyleRules();
mIsDestroying = true;
// We can't release all the event content in
// mCurrentEventContentStack here since there might be code on the
// stack that will release the event content too. Double release
// bad!
// The frames will be torn down, so remove them from the current
// event frame stack (since they'd be dangling references if we'd
// leave them in) and null out the mCurrentEventFrame pointer as
// well.
mCurrentEventFrame = nullptr;
int32_t i, count = mCurrentEventFrameStack.Length();
for (i = 0; i < count; i++) {
mCurrentEventFrameStack[i] = nullptr;
}
mFramesToDirty.Clear();
if (mViewManager) {
// Clear the view manager's weak pointer back to |this| in case it
// was leaked.
mViewManager->SetPresShell(nullptr);
mViewManager = nullptr;
}
mStyleSet->BeginShutdown(mPresContext);
nsRefreshDriver* rd = GetPresContext()->RefreshDriver();
// This shell must be removed from the document before the frame
// hierarchy is torn down to avoid finding deleted frames through
// this presshell while the frames are being torn down
if (mDocument) {
NS_ASSERTION(mDocument->GetShell() == this, "Wrong shell?");
mDocument->DeleteShell();
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->NotifyRefreshDriverDestroying(rd);
}
}
// Revoke any pending events. We need to do this and cancel pending reflows
// before we destroy the frame manager, since apparently frame destruction
// sometimes spins the event queue when plug-ins are involved(!).
rd->RemoveLayoutFlushObserver(this);
if (mHiddenInvalidationObserverRefreshDriver) {
mHiddenInvalidationObserverRefreshDriver->RemovePresShellToInvalidateIfHidden(this);
}
if (rd->PresContext() == GetPresContext()) {
rd->RevokeViewManagerFlush();
}
mResizeEvent.Revoke();
if (mAsyncResizeTimerIsActive) {
mAsyncResizeEventTimer->Cancel();
mAsyncResizeTimerIsActive = false;
}
CancelAllPendingReflows();
CancelPostedReflowCallbacks();
// Destroy the frame manager. This will destroy the frame hierarchy
mFrameConstructor->WillDestroyFrameTree();
// Destroy all frame properties (whose destruction was suppressed
// while destroying the frame tree, but which might contain more
// frames within the properties.
if (mPresContext) {
// Clear out the prescontext's property table -- since our frame tree is
// now dead, we shouldn't be looking up any more properties in that table.
// We want to do this before we call SetShell() on the prescontext, so
// property destructors can usefully call GetPresShell() on the
// prescontext.
mPresContext->PropertyTable()->DeleteAll();
}
NS_WARN_IF_FALSE(!mWeakFrames, "Weak frames alive after destroying FrameManager");
while (mWeakFrames) {
mWeakFrames->Clear(this);
}
// Let the style set do its cleanup.
mStyleSet->Shutdown(mPresContext);
if (mPresContext) {
// We hold a reference to the pres context, and it holds a weak link back
// to us. To avoid the pres context having a dangling reference, set its
// pres shell to nullptr
mPresContext->SetShell(nullptr);
// Clear the link handler (weak reference) as well
mPresContext->SetLinkHandler(nullptr);
}
mHaveShutDown = true;
}
void
PresShell::MakeZombie()
{
mIsZombie = true;
CancelAllPendingReflows();
}
void
nsIPresShell::SetAuthorStyleDisabled(bool aStyleDisabled)
{
if (aStyleDisabled != mStyleSet->GetAuthorStyleDisabled()) {
mStyleSet->SetAuthorStyleDisabled(aStyleDisabled);
ReconstructStyleData();
}
}
bool
nsIPresShell::GetAuthorStyleDisabled() const
{
return mStyleSet->GetAuthorStyleDisabled();
}
nsresult
PresShell::SetPreferenceStyleRules(bool aForceReflow)
{
if (!mDocument) {
return NS_ERROR_NULL_POINTER;
}
nsPIDOMWindow *window = mDocument->GetWindow();
// If the document doesn't have a window there's no need to notify
// its presshell about changes to preferences since the document is
// in a state where it doesn't matter any more (see
// nsDocumentViewer::Close()).
if (!window) {
return NS_ERROR_NULL_POINTER;
}
NS_PRECONDITION(mPresContext, "presContext cannot be null");
if (mPresContext) {
// first, make sure this is not a chrome shell
if (nsContentUtils::IsInChromeDocshell(mDocument)) {
return NS_OK;
}
#ifdef DEBUG_attinasi
printf("Setting Preference Style Rules:\n");
#endif
// if here, we need to create rules for the prefs
// - this includes the background-color, the text-color,
// the link color, the visited link color and the link-underlining
// first clear any exising rules
nsresult result = ClearPreferenceStyleRules();
// now the link rules (must come after the color rules, or links will not be correct color!)
// XXX - when there is both an override and agent pref stylesheet this won't matter,
// as the color rules will be overrides and the links rules will be agent
if (NS_SUCCEEDED(result)) {
result = SetPrefLinkRules();
}
if (NS_SUCCEEDED(result)) {
result = SetPrefFocusRules();
}
if (NS_SUCCEEDED(result)) {
result = SetPrefNoScriptRule();
}
if (NS_SUCCEEDED(result)) {
result = SetPrefNoFramesRule();
}
#ifdef DEBUG_attinasi
printf( "Preference Style Rules set: error=%ld\n", (long)result);
#endif
// Note that this method never needs to force any calculation; the caller
// will recalculate style if needed
return result;
}
return NS_ERROR_NULL_POINTER;
}
nsresult PresShell::ClearPreferenceStyleRules(void)
{
nsresult result = NS_OK;
if (mPrefStyleSheet) {
NS_ASSERTION(mStyleSet, "null styleset entirely unexpected!");
if (mStyleSet) {
// remove the sheet from the styleset:
// - note that we have to check for success by comparing the count before and after...
#ifdef DEBUG
int32_t numBefore = mStyleSet->SheetCount(nsStyleSet::eUserSheet);
NS_ASSERTION(numBefore > 0, "no user stylesheets in styleset, but we have one!");
#endif
mStyleSet->RemoveStyleSheet(nsStyleSet::eUserSheet, mPrefStyleSheet);
#ifdef DEBUG_attinasi
NS_ASSERTION((numBefore - 1) == mStyleSet->GetNumberOfUserStyleSheets(),
"Pref stylesheet was not removed");
printf("PrefStyleSheet removed\n");
#endif
// clear the sheet pointer: it is strictly historical now
mPrefStyleSheet = nullptr;
}
}
return result;
}
nsresult
PresShell::CreatePreferenceStyleSheet()
{
NS_ASSERTION(!mPrefStyleSheet, "prefStyleSheet already exists");
mPrefStyleSheet = new nsCSSStyleSheet(CORS_NONE);
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_NewURI(getter_AddRefs(uri), "about:PreferenceStyleSheet", nullptr);
if (NS_FAILED(rv)) {
mPrefStyleSheet = nullptr;
return rv;
}
NS_ASSERTION(uri, "null but no error");
mPrefStyleSheet->SetURIs(uri, uri, uri);
mPrefStyleSheet->SetComplete();
uint32_t index;
rv =
mPrefStyleSheet->InsertRuleInternal(NS_LITERAL_STRING("@namespace svg url(http://www.w3.org/2000/svg);"),
0, &index);
if (NS_FAILED(rv)) {
mPrefStyleSheet = nullptr;
return rv;
}
rv =
mPrefStyleSheet->InsertRuleInternal(NS_LITERAL_STRING("@namespace url(http://www.w3.org/1999/xhtml);"),
0, &index);
if (NS_FAILED(rv)) {
mPrefStyleSheet = nullptr;
return rv;
}
mStyleSet->AppendStyleSheet(nsStyleSet::eUserSheet, mPrefStyleSheet);
return NS_OK;
}
// XXX We want these after the @namespace rules. Does order matter
// for these rules, or can we call StyleRule::StyleRuleCount()
// and just "append"?
static uint32_t sInsertPrefSheetRulesAt = 2;
nsresult
PresShell::SetPrefNoScriptRule()
{
nsresult rv = NS_OK;
// also handle the case where print is done from print preview
// see bug #342439 for more details
nsIDocument* doc = mDocument;
if (doc->IsStaticDocument()) {
doc = doc->GetOriginalDocument();
}
bool scriptEnabled = doc->IsScriptEnabled();
if (scriptEnabled) {
if (!mPrefStyleSheet) {
rv = CreatePreferenceStyleSheet();
NS_ENSURE_SUCCESS(rv, rv);
}
uint32_t index = 0;
mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("noscript{display:none!important}"),
sInsertPrefSheetRulesAt, &index);
}
return rv;
}
nsresult PresShell::SetPrefNoFramesRule(void)
{
NS_ASSERTION(mPresContext,"null prescontext not allowed");
if (!mPresContext) {
return NS_ERROR_FAILURE;
}
nsresult rv = NS_OK;
if (!mPrefStyleSheet) {
rv = CreatePreferenceStyleSheet();
NS_ENSURE_SUCCESS(rv, rv);
}
NS_ASSERTION(mPrefStyleSheet, "prefstylesheet should not be null");
bool allowSubframes = true;
nsCOMPtr<nsISupports> container = mPresContext->GetContainer();
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(container));
if (docShell) {
docShell->GetAllowSubframes(&allowSubframes);
}
if (!allowSubframes) {
uint32_t index = 0;
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("noframes{display:block}"),
sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(rv, rv);
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("frame, frameset, iframe {display:none!important}"),
sInsertPrefSheetRulesAt, &index);
}
return rv;
}
nsresult PresShell::SetPrefLinkRules(void)
{
NS_ASSERTION(mPresContext,"null prescontext not allowed");
if (!mPresContext) {
return NS_ERROR_FAILURE;
}
nsresult rv = NS_OK;
if (!mPrefStyleSheet) {
rv = CreatePreferenceStyleSheet();
NS_ENSURE_SUCCESS(rv, rv);
}
NS_ASSERTION(mPrefStyleSheet, "prefstylesheet should not be null");
// support default link colors:
// this means the link colors need to be overridable,
// which they are if we put them in the agent stylesheet,
// though if using an override sheet this will cause authors grief still
// In the agent stylesheet, they are !important when we are ignoring document colors
nscolor linkColor(mPresContext->DefaultLinkColor());
nscolor activeColor(mPresContext->DefaultActiveLinkColor());
nscolor visitedColor(mPresContext->DefaultVisitedLinkColor());
NS_NAMED_LITERAL_STRING(ruleClose, "}");
uint32_t index = 0;
nsAutoString strColor;
// insert a rule to color links: '*|*:link {color: #RRGGBB [!important];}'
ColorToString(linkColor, strColor);
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:link{color:") +
strColor + ruleClose,
sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(rv, rv);
// - visited links: '*|*:visited {color: #RRGGBB [!important];}'
ColorToString(visitedColor, strColor);
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:visited{color:") +
strColor + ruleClose,
sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(rv, rv);
// - active links: '*|*:-moz-any-link:active {color: #RRGGBB [!important];}'
ColorToString(activeColor, strColor);
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:-moz-any-link:active{color:") +
strColor + ruleClose,
sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(rv, rv);
bool underlineLinks =
mPresContext->GetCachedBoolPref(kPresContext_UnderlineLinks);
if (underlineLinks) {
// create a rule to make underlining happen
// '*|*:-moz-any-link {text-decoration:[underline|none];}'
// no need for important, we want these to be overridable
// NOTE: these must go in the agent stylesheet or they cannot be
// overridden by authors
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:-moz-any-link:not(svg|a){text-decoration:underline}"),
sInsertPrefSheetRulesAt, &index);
} else {
rv = mPrefStyleSheet->
InsertRuleInternal(NS_LITERAL_STRING("*|*:-moz-any-link{text-decoration:none}"),
sInsertPrefSheetRulesAt, &index);
}
return rv;
}
nsresult PresShell::SetPrefFocusRules(void)
{
NS_ASSERTION(mPresContext,"null prescontext not allowed");
nsresult result = NS_OK;
if (!mPresContext)
result = NS_ERROR_FAILURE;
if (NS_SUCCEEDED(result) && !mPrefStyleSheet)
result = CreatePreferenceStyleSheet();
if (NS_SUCCEEDED(result)) {
NS_ASSERTION(mPrefStyleSheet, "prefstylesheet should not be null");
if (mPresContext->GetUseFocusColors()) {
nscolor focusBackground(mPresContext->FocusBackgroundColor());
nscolor focusText(mPresContext->FocusTextColor());
// insert a rule to make focus the preferred color
uint32_t index = 0;
nsAutoString strRule, strColor;
///////////////////////////////////////////////////////////////
// - focus: '*:focus
ColorToString(focusText,strColor);
strRule.AppendLiteral("*:focus,*:focus>font {color: ");
strRule.Append(strColor);
strRule.AppendLiteral(" !important; background-color: ");
ColorToString(focusBackground,strColor);
strRule.Append(strColor);
strRule.AppendLiteral(" !important; } ");
// insert the rules
result = mPrefStyleSheet->
InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
}
uint8_t focusRingWidth = mPresContext->FocusRingWidth();
bool focusRingOnAnything = mPresContext->GetFocusRingOnAnything();
uint8_t focusRingStyle = mPresContext->GetFocusRingStyle();
if ((NS_SUCCEEDED(result) && focusRingWidth != 1 && focusRingWidth <= 4 ) || focusRingOnAnything) {
uint32_t index = 0;
nsAutoString strRule;
if (!focusRingOnAnything)
strRule.AppendLiteral("*|*:link:focus, *|*:visited"); // If we only want focus rings on the normal things like links
strRule.AppendLiteral(":focus {outline: "); // For example 3px dotted WindowText (maximum 4)
strRule.AppendInt(focusRingWidth);
if (focusRingStyle == 0) // solid
strRule.AppendLiteral("px solid -moz-mac-focusring !important; -moz-outline-radius: 3px; outline-offset: 1px; } ");
else // dotted
strRule.AppendLiteral("px dotted WindowText !important; } ");
// insert the rules
result = mPrefStyleSheet->
InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(result, result);
if (focusRingWidth != 1) {
// If the focus ring width is different from the default, fix buttons with rings
strRule.AssignLiteral("button::-moz-focus-inner, input[type=\"reset\"]::-moz-focus-inner,");
strRule.AppendLiteral("input[type=\"button\"]::-moz-focus-inner, ");
strRule.AppendLiteral("input[type=\"submit\"]::-moz-focus-inner { padding: 1px 2px 1px 2px; border: ");
strRule.AppendInt(focusRingWidth);
if (focusRingStyle == 0) // solid
strRule.AppendLiteral("px solid transparent !important; } ");
else
strRule.AppendLiteral("px dotted transparent !important; } ");
result = mPrefStyleSheet->
InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
NS_ENSURE_SUCCESS(result, result);
strRule.AssignLiteral("button:focus::-moz-focus-inner, input[type=\"reset\"]:focus::-moz-focus-inner,");
strRule.AppendLiteral("input[type=\"button\"]:focus::-moz-focus-inner, input[type=\"submit\"]:focus::-moz-focus-inner {");
strRule.AppendLiteral("border-color: ButtonText !important; }");
result = mPrefStyleSheet->
InsertRuleInternal(strRule, sInsertPrefSheetRulesAt, &index);
}
}
}
return result;
}
void
PresShell::AddUserSheet(nsISupports* aSheet)
{
// Make sure this does what nsDocumentViewer::CreateStyleSet does wrt
// ordering. We want this new sheet to come after all the existing stylesheet
// service sheets, but before other user sheets; see nsIStyleSheetService.idl
// for the ordering. Just remove and readd all the nsStyleSheetService
// sheets.
nsCOMPtr<nsIStyleSheetService> dummy =
do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
mStyleSet->BeginUpdate();
nsStyleSheetService *sheetService = nsStyleSheetService::gInstance;
nsCOMArray<nsIStyleSheet> & userSheets = *sheetService->UserStyleSheets();
int32_t i;
// Iterate forwards when removing so the searches for RemoveStyleSheet are as
// short as possible.
for (i = 0; i < userSheets.Count(); ++i) {
mStyleSet->RemoveStyleSheet(nsStyleSet::eUserSheet, userSheets[i]);
}
// Now iterate backwards, so that the order of userSheets will be the same as
// the order of sheets from it in the style set.
for (i = userSheets.Count() - 1; i >= 0; --i) {
mStyleSet->PrependStyleSheet(nsStyleSet::eUserSheet, userSheets[i]);
}
mStyleSet->EndUpdate();
ReconstructStyleData();
}
void
PresShell::AddAgentSheet(nsISupports* aSheet)
{
// Make sure this does what nsDocumentViewer::CreateStyleSet does
// wrt ordering.
nsCOMPtr<nsIStyleSheet> sheet = do_QueryInterface(aSheet);
if (!sheet) {
return;
}
mStyleSet->AppendStyleSheet(nsStyleSet::eAgentSheet, sheet);
ReconstructStyleData();
}
void
PresShell::AddAuthorSheet(nsISupports* aSheet)
{
nsCOMPtr<nsIStyleSheet> sheet = do_QueryInterface(aSheet);
if (!sheet) {
return;
}
// Document specific "additional" Author sheets should be stronger than the ones
// added with the StyleSheetService.
nsIStyleSheet* firstAuthorSheet = mDocument->FirstAdditionalAuthorSheet();
if (firstAuthorSheet) {
mStyleSet->InsertStyleSheetBefore(nsStyleSet::eDocSheet, sheet, firstAuthorSheet);
} else {
mStyleSet->AppendStyleSheet(nsStyleSet::eDocSheet, sheet);
}
ReconstructStyleData();
}
void
PresShell::RemoveSheet(nsStyleSet::sheetType aType, nsISupports* aSheet)
{
nsCOMPtr<nsIStyleSheet> sheet = do_QueryInterface(aSheet);
if (!sheet) {
return;
}
mStyleSet->RemoveStyleSheet(aType, sheet);
ReconstructStyleData();
}
NS_IMETHODIMP
PresShell::SetDisplaySelection(int16_t aToggle)
{
mSelection->SetDisplaySelection(aToggle);
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetDisplaySelection(int16_t *aToggle)
{
*aToggle = mSelection->GetDisplaySelection();
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetSelection(SelectionType aType, nsISelection **aSelection)
{
if (!aSelection || !mSelection)
return NS_ERROR_NULL_POINTER;
*aSelection = mSelection->GetSelection(aType);
if (!(*aSelection))
return NS_ERROR_INVALID_ARG;
NS_ADDREF(*aSelection);
return NS_OK;
}
Selection*
PresShell::GetCurrentSelection(SelectionType aType)
{
if (!mSelection)
return nullptr;
return mSelection->GetSelection(aType);
}
NS_IMETHODIMP
PresShell::ScrollSelectionIntoView(SelectionType aType, SelectionRegion aRegion,
int16_t aFlags)
{
if (!mSelection)
return NS_ERROR_NULL_POINTER;
return mSelection->ScrollSelectionIntoView(aType, aRegion, aFlags);
}
NS_IMETHODIMP
PresShell::RepaintSelection(SelectionType aType)
{
if (!mSelection)
return NS_ERROR_NULL_POINTER;
return mSelection->RepaintSelection(aType);
}
// Make shell be a document observer
void
PresShell::BeginObservingDocument()
{
if (mDocument && !mIsDestroying) {
mDocument->AddObserver(this);
if (mIsDocumentGone) {
NS_WARNING("Adding a presshell that was disconnected from the document "
"as a document observer? Sounds wrong...");
mIsDocumentGone = false;
}
}
}
// Make shell stop being a document observer
void
PresShell::EndObservingDocument()
{
// XXXbz do we need to tell the frame constructor that the document
// is gone, perhaps? Except for printing it's NOT gone, sometimes.
mIsDocumentGone = true;
if (mDocument) {
mDocument->RemoveObserver(this);
}
}
#ifdef DEBUG_kipp
char* nsPresShell_ReflowStackPointerTop;
#endif
nsresult
PresShell::Initialize(nscoord aWidth, nscoord aHeight)
{
if (mIsDestroying) {
return NS_OK;
}
if (!mDocument) {
// Nothing to do
return NS_OK;
}
mozilla::TimeStamp timerStart = mozilla::TimeStamp::Now();
NS_ASSERTION(!mDidInitialize, "Why are we being called?");
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
mDidInitialize = true;
#ifdef DEBUG
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
if (mDocument) {
nsIURI *uri = mDocument->GetDocumentURI();
if (uri) {
nsAutoCString url;
uri->GetSpec(url);
printf("*** PresShell::Initialize (this=%p, url='%s')\n", (void*)this, url.get());
}
}
}
#endif
if (mCaret)
mCaret->EraseCaret();
// XXX Do a full invalidate at the beginning so that invalidates along
// the way don't have region accumulation issues?
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
// Get the root frame from the frame manager
// XXXbz it would be nice to move this somewhere else... like frame manager
// Init(), say. But we need to make sure our views are all set up by the
// time we do this!
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
NS_ASSERTION(!rootFrame, "How did that happen, exactly?");
if (!rootFrame) {
nsAutoScriptBlocker scriptBlocker;
mFrameConstructor->BeginUpdate();
rootFrame = mFrameConstructor->ConstructRootFrame();
mFrameConstructor->SetRootFrame(rootFrame);
mFrameConstructor->EndUpdate();
}
NS_ENSURE_STATE(!mHaveShutDown);
if (!rootFrame) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (nsIFrame* f = rootFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
if (f->GetStateBits() & NS_FRAME_NO_COMPONENT_ALPHA) {
f->InvalidateFrameSubtree();
f->RemoveStateBits(NS_FRAME_NO_COMPONENT_ALPHA);
}
}
Element *root = mDocument->GetRootElement();
if (root) {
{
nsAutoCauseReflowNotifier reflowNotifier(this);
mFrameConstructor->BeginUpdate();
// Have the style sheet processor construct frame for the root
// content object down
mFrameConstructor->ContentInserted(nullptr, root, nullptr, false);
VERIFY_STYLE_TREE;
// Something in mFrameConstructor->ContentInserted may have caused
// Destroy() to get called, bug 337586.
NS_ENSURE_STATE(!mHaveShutDown);
mFrameConstructor->EndUpdate();
}
// nsAutoScriptBlocker going out of scope may have killed us too
NS_ENSURE_STATE(!mHaveShutDown);
// Run the XBL binding constructors for any new frames we've constructed
mDocument->BindingManager()->ProcessAttachedQueue();
// Constructors may have killed us too
NS_ENSURE_STATE(!mHaveShutDown);
// Now flush out pending restyles before we actually reflow, in
// case XBL constructors changed styles somewhere.
{
nsAutoScriptBlocker scriptBlocker;
mFrameConstructor->CreateNeededFrames();
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
// And that might have run _more_ XBL constructors
NS_ENSURE_STATE(!mHaveShutDown);
}
NS_ASSERTION(rootFrame, "How did that happen?");
// Note: when the frame was created above it had the NS_FRAME_IS_DIRTY bit
// set, but XBL processing could have caused a reflow which clears it.
if (MOZ_LIKELY(rootFrame->GetStateBits() & NS_FRAME_IS_DIRTY)) {
// Unset the DIRTY bits so that FrameNeedsReflow() will work right.
rootFrame->RemoveStateBits(NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN);
NS_ASSERTION(!mDirtyRoots.Contains(rootFrame),
"Why is the root in mDirtyRoots already?");
FrameNeedsReflow(rootFrame, eResize, NS_FRAME_IS_DIRTY);
NS_ASSERTION(mDirtyRoots.Contains(rootFrame),
"Should be in mDirtyRoots now");
NS_ASSERTION(mReflowScheduled, "Why no reflow scheduled?");
}
// Restore our root scroll position now if we're getting here after EndLoad
// got called, since this is our one chance to do it. Note that we need not
// have reflowed for this to work; when the scrollframe is finally reflowed
// it'll pick up the position we store in it here.
if (!mDocumentLoading) {
RestoreRootScrollPosition();
}
// For printing, we just immediately unsuppress.
if (!mPresContext->IsPaginated()) {
// Kick off a one-shot timer based off our pref value. When this timer
// fires, if painting is still locked down, then we will go ahead and
// trigger a full invalidate and allow painting to proceed normally.
mPaintingSuppressed = true;
// Don't suppress painting if the document isn't loading.
nsIDocument::ReadyState readyState = mDocument->GetReadyStateEnum();
if (readyState != nsIDocument::READYSTATE_COMPLETE) {
mPaintSuppressionTimer = do_CreateInstance("@mozilla.org/timer;1");
}
if (!mPaintSuppressionTimer) {
mPaintingSuppressed = false;
} else {
// Initialize the timer.
// Default to PAINTLOCK_EVENT_DELAY if we can't get the pref value.
int32_t delay =
Preferences::GetInt("nglayout.initialpaint.delay",
PAINTLOCK_EVENT_DELAY);
mPaintSuppressionTimer->InitWithFuncCallback(sPaintSuppressionCallback,
this, delay,
nsITimer::TYPE_ONE_SHOT);
}
}
if (root && root->IsXUL()) {
mozilla::Telemetry::AccumulateTimeDelta(Telemetry::XUL_INITIAL_FRAME_CONSTRUCTION,
timerStart);
}
return NS_OK; //XXX this needs to be real. MMP
}
void
PresShell::sPaintSuppressionCallback(nsITimer *aTimer, void* aPresShell)
{
nsRefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
if (self)
self->UnsuppressPainting();
}
void
PresShell::AsyncResizeEventCallback(nsITimer* aTimer, void* aPresShell)
{
static_cast<PresShell*>(aPresShell)->FireResizeEvent();
}
nsresult
PresShell::ResizeReflowOverride(nscoord aWidth, nscoord aHeight)
{
mViewportOverridden = true;
return ResizeReflowIgnoreOverride(aWidth, aHeight);
}
nsresult
PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight)
{
if (mViewportOverridden) {
// The viewport has been overridden, and this reflow request
// didn't ask to ignore the override. Pretend it didn't happen.
return NS_OK;
}
return ResizeReflowIgnoreOverride(aWidth, aHeight);
}
nsresult
PresShell::ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight)
{
NS_PRECONDITION(!mIsReflowing, "Shouldn't be in reflow here!");
NS_PRECONDITION(aWidth != NS_UNCONSTRAINEDSIZE,
"shouldn't use unconstrained widths anymore");
// If we don't have a root frame yet, that means we haven't had our initial
// reflow... If that's the case, and aWidth or aHeight is unconstrained,
// ignore them altogether.
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame && aHeight == NS_UNCONSTRAINEDSIZE) {
// We can't do the work needed for SizeToContent without a root
// frame, and we want to return before setting the visible area.
return NS_ERROR_NOT_AVAILABLE;
}
nsRefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
// Take this ref after viewManager so it'll make sure to go away first
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
if (!mIsDestroying && !mResizeEvent.IsPending() &&
!mAsyncResizeTimerIsActive) {
FireBeforeResizeEvent();
}
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
// There isn't anything useful we can do if the initial reflow hasn't happened
rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame)
return NS_OK;
if (!GetPresContext()->SupressingResizeReflow())
{
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
// Make sure style is up to date
{
nsAutoScriptBlocker scriptBlocker;
mFrameConstructor->CreateNeededFrames();
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
rootFrame = mFrameConstructor->GetRootFrame();
if (!mIsDestroying && rootFrame) {
// XXX Do a full invalidate at the beginning so that invalidates along
// the way don't have region accumulation issues?
{
nsAutoCauseReflowNotifier crNotifier(this);
WillDoReflow();
// Kick off a top-down reflow
AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
mDirtyRoots.RemoveElement(rootFrame);
DoReflow(rootFrame, true);
}
DidDoReflow(true, false);
}
}
rootFrame = mFrameConstructor->GetRootFrame();
if (aHeight == NS_UNCONSTRAINEDSIZE && rootFrame) {
mPresContext->SetVisibleArea(
nsRect(0, 0, aWidth, rootFrame->GetRect().height));
}
if (!mIsDestroying && !mResizeEvent.IsPending() &&
!mAsyncResizeTimerIsActive) {
if (mInResize) {
if (!mAsyncResizeEventTimer) {
mAsyncResizeEventTimer = do_CreateInstance("@mozilla.org/timer;1");
}
if (mAsyncResizeEventTimer) {
mAsyncResizeTimerIsActive = true;
mAsyncResizeEventTimer->InitWithFuncCallback(AsyncResizeEventCallback,
this, 15,
nsITimer::TYPE_ONE_SHOT);
}
} else {
nsRefPtr<nsRunnableMethod<PresShell> > resizeEvent =
NS_NewRunnableMethod(this, &PresShell::FireResizeEvent);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(resizeEvent))) {
mResizeEvent = resizeEvent;
mDocument->SetNeedStyleFlush();
}
}
}
return NS_OK; //XXX this needs to be real. MMP
}
void
PresShell::FireBeforeResizeEvent()
{
if (mIsDocumentGone)
return;
// Send beforeresize event from here.
WidgetEvent event(true, NS_BEFORERESIZE_EVENT);
nsPIDOMWindow *window = mDocument->GetWindow();
if (window) {
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
nsEventDispatcher::Dispatch(window, mPresContext, &event);
}
}
void
PresShell::FireResizeEvent()
{
if (mAsyncResizeTimerIsActive) {
mAsyncResizeTimerIsActive = false;
mAsyncResizeEventTimer->Cancel();
}
mResizeEvent.Revoke();
if (mIsDocumentGone)
return;
//Send resize event from here.
WidgetEvent event(true, NS_RESIZE_EVENT);
nsEventStatus status = nsEventStatus_eIgnore;
nsPIDOMWindow *window = mDocument->GetWindow();
if (window) {
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
mInResize = true;
nsEventDispatcher::Dispatch(window, mPresContext, &event, nullptr, &status);
mInResize = false;
}
}
void
PresShell::SetIgnoreFrameDestruction(bool aIgnore)
{
if (mDocument) {
// We need to tell the ImageLoader to drop all its references to frames
// because they're about to go away and it won't get notifications of that.
mDocument->StyleImageLoader()->ClearFrames();
}
mIgnoreFrameDestruction = aIgnore;
}
void
PresShell::NotifyDestroyingFrame(nsIFrame* aFrame)
{
if (!mIgnoreFrameDestruction) {
mDocument->StyleImageLoader()->DropRequestsForFrame(aFrame);
mFrameConstructor->NotifyDestroyingFrame(aFrame);
for (int32_t idx = mDirtyRoots.Length(); idx; ) {
--idx;
if (mDirtyRoots[idx] == aFrame) {
mDirtyRoots.RemoveElementAt(idx);
}
}
// Remove frame properties
mPresContext->NotifyDestroyingFrame(aFrame);
if (aFrame == mCurrentEventFrame) {
mCurrentEventContent = aFrame->GetContent();
mCurrentEventFrame = nullptr;
}
#ifdef DEBUG
if (aFrame == mDrawEventTargetFrame) {
mDrawEventTargetFrame = nullptr;
}
#endif
for (unsigned int i=0; i < mCurrentEventFrameStack.Length(); i++) {
if (aFrame == mCurrentEventFrameStack.ElementAt(i)) {
//One of our stack frames was deleted. Get its content so that when we
//pop it we can still get its new frame from its content
nsIContent *currentEventContent = aFrame->GetContent();
mCurrentEventContentStack.ReplaceObjectAt(currentEventContent, i);
mCurrentEventFrameStack[i] = nullptr;
}
}
mFramesToDirty.RemoveEntry(aFrame);
} else {
// We must delete this property in situ so that its destructor removes the
// frame from FrameLayerBuilder::DisplayItemData::mFrameList -- otherwise
// the DisplayItemData destructor will use the destroyed frame when it
// tries to remove it from the (array) value of this property.
mPresContext->PropertyTable()->
Delete(aFrame, FrameLayerBuilder::LayerManagerDataProperty());
}
}
already_AddRefed<nsCaret> PresShell::GetCaret() const
{
nsRefPtr<nsCaret> caret = mCaret;
return caret.forget();
}
void PresShell::MaybeInvalidateCaretPosition()
{
if (mCaret) {
mCaret->InvalidateOutsideCaret();
}
}
void PresShell::SetCaret(nsCaret *aNewCaret)
{
mCaret = aNewCaret;
}
void PresShell::RestoreCaret()
{
mCaret = mOriginalCaret;
}
NS_IMETHODIMP PresShell::SetCaretEnabled(bool aInEnable)
{
bool oldEnabled = mCaretEnabled;
mCaretEnabled = aInEnable;
if (mCaret && (mCaretEnabled != oldEnabled))
{
/* Don't change the caret's selection here! This was an evil side-effect of SetCaretEnabled()
nsCOMPtr<nsIDOMSelection> domSel;
if (NS_SUCCEEDED(GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(domSel))) && domSel)
mCaret->SetCaretDOMSelection(domSel);
*/
mCaret->SetCaretVisible(mCaretEnabled);
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretReadOnly(bool aReadOnly)
{
if (mCaret)
mCaret->SetCaretReadOnly(aReadOnly);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretEnabled(bool *aOutEnabled)
{
NS_ENSURE_ARG_POINTER(aOutEnabled);
*aOutEnabled = mCaretEnabled;
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretVisibilityDuringSelection(bool aVisibility)
{
if (mCaret)
mCaret->SetVisibilityDuringSelection(aVisibility);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretVisible(bool *aOutIsVisible)
{
*aOutIsVisible = false;
if (mCaret) {
nsresult rv = mCaret->GetCaretVisible(aOutIsVisible);
NS_ENSURE_SUCCESS(rv,rv);
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetSelectionFlags(int16_t aInEnable)
{
mSelectionFlags = aInEnable;
return NS_OK;
}
NS_IMETHODIMP PresShell::GetSelectionFlags(int16_t *aOutEnable)
{
if (!aOutEnable)
return NS_ERROR_INVALID_ARG;
*aOutEnable = mSelectionFlags;
return NS_OK;
}
//implementation of nsISelectionController
NS_IMETHODIMP
PresShell::CharacterMove(bool aForward, bool aExtend)
{
return mSelection->CharacterMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::CharacterExtendForDelete()
{
return mSelection->CharacterExtendForDelete();
}
NS_IMETHODIMP
PresShell::CharacterExtendForBackspace()
{
return mSelection->CharacterExtendForBackspace();
}
NS_IMETHODIMP
PresShell::WordMove(bool aForward, bool aExtend)
{
nsresult result = mSelection->WordMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result))
result = CompleteMove(aForward, aExtend);
return result;
}
NS_IMETHODIMP
PresShell::WordExtendForDelete(bool aForward)
{
return mSelection->WordExtendForDelete(aForward);
}
NS_IMETHODIMP
PresShell::LineMove(bool aForward, bool aExtend)
{
nsresult result = mSelection->LineMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result))
result = CompleteMove(aForward,aExtend);
return result;
}
NS_IMETHODIMP
PresShell::IntraLineMove(bool aForward, bool aExtend)
{
return mSelection->IntraLineMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::PageMove(bool aForward, bool aExtend)
{
nsIScrollableFrame *scrollableFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (!scrollableFrame)
return NS_OK;
mSelection->CommonPageMove(aForward, aExtend, scrollableFrame);
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS);
}
NS_IMETHODIMP
PresShell::ScrollPage(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::PAGES,
nsIScrollableFrame::SMOOTH);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollLine(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
int32_t lineCount = Preferences::GetInt("toolkit.scrollbox.verticalScrollDistance",
NS_DEFAULT_VERTICAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? lineCount : -lineCount),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollCharacter(bool aRight)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eHorizontal);
if (scrollFrame) {
int32_t h = Preferences::GetInt("toolkit.scrollbox.horizontalScrollDistance",
NS_DEFAULT_HORIZONTAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(aRight ? h : -h, 0),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteScroll(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::WHOLE,
nsIScrollableFrame::SMOOTH);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteMove(bool aForward, bool aExtend)
{
// Beware! This may flush notifications via synchronous
// ScrollSelectionIntoView.
nsIContent* limiter = mSelection->GetAncestorLimiter();
nsIFrame* frame = limiter ? limiter->GetPrimaryFrame()
: FrameConstructor()->GetRootElementFrame();
if (!frame)
return NS_ERROR_FAILURE;
nsIFrame::CaretPosition pos =
frame->GetExtremeCaretPosition(!aForward);
mSelection->HandleClick(pos.mResultContent, pos.mContentOffset,
pos.mContentOffset, aExtend, false, aForward);
if (limiter) {
// HandleClick resets ancestorLimiter, so set it again.
mSelection->SetAncestorLimiter(limiter);
}
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS);
}
NS_IMETHODIMP
PresShell::SelectAll()
{
return mSelection->SelectAll();
}
static void
DoCheckVisibility(nsPresContext* aPresContext,
nsIContent* aNode,
int16_t aStartOffset,
int16_t aEndOffset,
bool* aRetval)
{
nsIFrame* frame = aNode->GetPrimaryFrame();
if (!frame) {
// No frame to look at so it must not be visible.
return;
}
// Start process now to go through all frames to find startOffset. Then check
// chars after that to see if anything until EndOffset is visible.
bool finished = false;
frame->CheckVisibility(aPresContext, aStartOffset, aEndOffset, true,
&finished, aRetval);
// Don't worry about other return value.
}
NS_IMETHODIMP
PresShell::CheckVisibility(nsIDOMNode *node, int16_t startOffset, int16_t EndOffset, bool *_retval)
{
if (!node || startOffset>EndOffset || !_retval || startOffset<0 || EndOffset<0)
return NS_ERROR_INVALID_ARG;
*_retval = false; //initialize return parameter
nsCOMPtr<nsIContent> content(do_QueryInterface(node));
if (!content)
return NS_ERROR_FAILURE;
DoCheckVisibility(mPresContext, content, startOffset, EndOffset, _retval);
return NS_OK;
}
nsresult
PresShell::CheckVisibilityContent(nsIContent* aNode, int16_t aStartOffset,
int16_t aEndOffset, bool* aRetval)
{
if (!aNode || aStartOffset > aEndOffset || !aRetval ||
aStartOffset < 0 || aEndOffset < 0) {
return NS_ERROR_INVALID_ARG;
}
*aRetval = false;
DoCheckVisibility(mPresContext, aNode, aStartOffset, aEndOffset, aRetval);
return NS_OK;
}
//end implementations nsISelectionController
nsIFrame*
nsIPresShell::GetRootFrameExternal() const
{
return mFrameConstructor->GetRootFrame();
}
nsIFrame*
nsIPresShell::GetRootScrollFrame() const
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
// Ensure root frame is a viewport frame
if (!rootFrame || nsGkAtoms::viewportFrame != rootFrame->GetType())
return nullptr;
nsIFrame* theFrame = rootFrame->GetFirstPrincipalChild();
if (!theFrame || nsGkAtoms::scrollFrame != theFrame->GetType())
return nullptr;
return theFrame;
}
nsIScrollableFrame*
nsIPresShell::GetRootScrollFrameAsScrollable() const
{
nsIFrame* frame = GetRootScrollFrame();
if (!frame)
return nullptr;
nsIScrollableFrame* scrollableFrame = do_QueryFrame(frame);
NS_ASSERTION(scrollableFrame,
"All scroll frames must implement nsIScrollableFrame");
return scrollableFrame;
}
nsIScrollableFrame*
nsIPresShell::GetRootScrollFrameAsScrollableExternal() const
{
return GetRootScrollFrameAsScrollable();
}
nsIPageSequenceFrame*
PresShell::GetPageSequenceFrame() const
{
nsIFrame* frame = mFrameConstructor->GetPageSequenceFrame();
return do_QueryFrame(frame);
}
void
PresShell::BeginUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
{
#ifdef DEBUG
mUpdateCount++;
#endif
mFrameConstructor->BeginUpdate();
if (aUpdateType & UPDATE_STYLE)
mStyleSet->BeginUpdate();
}
void
PresShell::EndUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
{
#ifdef DEBUG
NS_PRECONDITION(0 != mUpdateCount, "too many EndUpdate's");
--mUpdateCount;
#endif
if (aUpdateType & UPDATE_STYLE) {
mStyleSet->EndUpdate();
if (mStylesHaveChanged || !mChangedScopeStyleRoots.IsEmpty())
ReconstructStyleData();
}
mFrameConstructor->EndUpdate();
}
void
PresShell::RestoreRootScrollPosition()
{
nsIScrollableFrame* scrollableFrame = GetRootScrollFrameAsScrollable();
if (scrollableFrame) {
scrollableFrame->ScrollToRestoredPosition();
}
}
void
PresShell::BeginLoad(nsIDocument *aDocument)
{
mDocumentLoading = true;
}
void
PresShell::EndLoad(nsIDocument *aDocument)
{
NS_PRECONDITION(aDocument == mDocument, "Wrong document");
RestoreRootScrollPosition();
mDocumentLoading = false;
}
#ifdef DEBUG
void
PresShell::VerifyHasDirtyRootAncestor(nsIFrame* aFrame)
{
// XXXbz due to bug 372769, can't actually assert anything here...
return;
// XXXbz shouldn't need this part; remove it once FrameNeedsReflow
// handles the root frame correctly.
if (!aFrame->GetParent()) {
return;
}
// Make sure that there is a reflow root ancestor of |aFrame| that's
// in mDirtyRoots already.
while (aFrame && (aFrame->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN)) {
if (((aFrame->GetStateBits() & NS_FRAME_REFLOW_ROOT) ||
!aFrame->GetParent()) &&
mDirtyRoots.Contains(aFrame)) {
return;
}
aFrame = aFrame->GetParent();
}
NS_NOTREACHED("Frame has dirty bits set but isn't scheduled to be "
"reflowed?");
}
#endif
void
PresShell::FrameNeedsReflow(nsIFrame *aFrame, IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd)
{
NS_PRECONDITION(aBitToAdd == NS_FRAME_IS_DIRTY ||
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN,
"Unexpected bits being added");
NS_PRECONDITION(aIntrinsicDirty != eStyleChange ||
aBitToAdd == NS_FRAME_IS_DIRTY,
"bits don't correspond to style change reason");
NS_ASSERTION(!mIsReflowing, "can't mark frame dirty during reflow");
// If we've not yet done the initial reflow, then don't bother
// enqueuing a reflow command yet.
if (! mDidInitialize)
return;
// If we're already destroying, don't bother with this either.
if (mIsDestroying)
return;
#ifdef DEBUG
//printf("gShellCounter: %d\n", gShellCounter++);
if (mInVerifyReflow)
return;
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
printf("\nPresShell@%p: frame %p needs reflow\n", (void*)this, (void*)aFrame);
if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
printf("Current content model:\n");
Element *rootElement = mDocument->GetRootElement();
if (rootElement) {
rootElement->List(stdout, 0);
}
}
}
#endif
nsAutoTArray<nsIFrame*, 4> subtrees;
subtrees.AppendElement(aFrame);
do {
nsIFrame *subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
subtrees.RemoveElementAt(subtrees.Length() - 1);
// Grab |wasDirty| now so we can go ahead and update the bits on
// subtreeRoot.
bool wasDirty = NS_SUBTREE_DIRTY(subtreeRoot);
subtreeRoot->AddStateBits(aBitToAdd);
// Now if subtreeRoot is a reflow root we can cut off this reflow at it if
// the bit being added is NS_FRAME_HAS_DIRTY_CHILDREN.
bool targetFrameDirty = (aBitToAdd == NS_FRAME_IS_DIRTY);
#define FRAME_IS_REFLOW_ROOT(_f) \
((_f->GetStateBits() & NS_FRAME_REFLOW_ROOT) && \
(_f != subtreeRoot || !targetFrameDirty))
// Mark the intrinsic widths as dirty on the frame, all of its ancestors,
// and all of its descendants, if needed:
if (aIntrinsicDirty != eResize) {
// Mark argument and all ancestors dirty. (Unless we hit a reflow
// root that should contain the reflow. That root could be
// subtreeRoot itself if it's not dirty, or it could be some
// ancestor of subtreeRoot.)
for (nsIFrame *a = subtreeRoot;
a && !FRAME_IS_REFLOW_ROOT(a);
a = a->GetParent())
a->MarkIntrinsicWidthsDirty();
}
if (aIntrinsicDirty == eStyleChange) {
// Mark all descendants dirty (using an nsTArray stack rather than
// recursion).
// Note that nsHTMLReflowState::InitResizeFlags has some similar
// code; see comments there for how and why it differs.
nsAutoTArray<nsIFrame*, 32> stack;
stack.AppendElement(subtreeRoot);
do {
nsIFrame *f = stack.ElementAt(stack.Length() - 1);
stack.RemoveElementAt(stack.Length() - 1);
if (f->GetType() == nsGkAtoms::placeholderFrame) {
nsIFrame *oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
// We have another distinct subtree we need to mark.
subtrees.AppendElement(oof);
}
}
nsIFrame::ChildListIterator lists(f);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* kid = childFrames.get();
kid->MarkIntrinsicWidthsDirty();
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
}
// Set NS_FRAME_HAS_DIRTY_CHILDREN bits (via nsIFrame::ChildIsDirty)
// up the tree until we reach either a frame that's already dirty or
// a reflow root.
nsIFrame *f = subtreeRoot;
for (;;) {
if (FRAME_IS_REFLOW_ROOT(f) || !f->GetParent()) {
// we've hit a reflow root or the root frame
if (!wasDirty) {
mDirtyRoots.AppendElement(f);
mDocument->SetNeedLayoutFlush();
}
#ifdef DEBUG
else {
VerifyHasDirtyRootAncestor(f);
}
#endif
break;
}
nsIFrame *child = f;
f = f->GetParent();
wasDirty = NS_SUBTREE_DIRTY(f);
f->ChildIsDirty(child);
NS_ASSERTION(f->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN,
"ChildIsDirty didn't do its job");
if (wasDirty) {
// This frame was already marked dirty.
#ifdef DEBUG
VerifyHasDirtyRootAncestor(f);
#endif
break;
}
}
} while (subtrees.Length() != 0);
MaybeScheduleReflow();
}
void
PresShell::FrameNeedsToContinueReflow(nsIFrame *aFrame)
{
NS_ASSERTION(mIsReflowing, "Must be in reflow when marking path dirty.");
NS_PRECONDITION(mCurrentReflowRoot, "Must have a current reflow root here");
NS_ASSERTION(aFrame == mCurrentReflowRoot ||
nsLayoutUtils::IsProperAncestorFrame(mCurrentReflowRoot, aFrame),
"Frame passed in is not the descendant of mCurrentReflowRoot");
NS_ASSERTION(aFrame->GetStateBits() & NS_FRAME_IN_REFLOW,
"Frame passed in not in reflow?");
mFramesToDirty.PutEntry(aFrame);
}
nsIScrollableFrame*
nsIPresShell::GetFrameToScrollAsScrollable(
nsIPresShell::ScrollDirection aDirection)
{
nsIScrollableFrame* scrollFrame = nullptr;
nsCOMPtr<nsIContent> focusedContent;
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && mDocument) {
nsCOMPtr<nsIDOMWindow> window = do_QueryInterface(mDocument->GetWindow());
nsCOMPtr<nsIDOMElement> focusedElement;
fm->GetFocusedElementForWindow(window, false, nullptr, getter_AddRefs(focusedElement));
focusedContent = do_QueryInterface(focusedElement);
}
if (!focusedContent && mSelection) {
nsISelection* domSelection = mSelection->
GetSelection(nsISelectionController::SELECTION_NORMAL);
if (domSelection) {
nsCOMPtr<nsIDOMNode> focusedNode;
domSelection->GetFocusNode(getter_AddRefs(focusedNode));
focusedContent = do_QueryInterface(focusedNode);
}
}
if (focusedContent) {
nsIFrame* startFrame = focusedContent->GetPrimaryFrame();
if (startFrame) {
scrollFrame = startFrame->GetScrollTargetFrame();
if (scrollFrame) {
startFrame = scrollFrame->GetScrolledFrame();
}
if (aDirection == nsIPresShell::eEither) {
scrollFrame =
nsLayoutUtils::GetNearestScrollableFrame(startFrame);
} else {
scrollFrame =
nsLayoutUtils::GetNearestScrollableFrameForDirection(startFrame,
aDirection == eVertical ? nsLayoutUtils::eVertical :
nsLayoutUtils::eHorizontal);
}
}
}
if (!scrollFrame) {
scrollFrame = GetRootScrollFrameAsScrollable();
}
return scrollFrame;
}
void
PresShell::CancelAllPendingReflows()
{
mDirtyRoots.Clear();
if (mReflowScheduled) {
GetPresContext()->RefreshDriver()->RemoveLayoutFlushObserver(this);
mReflowScheduled = false;
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
nsresult
PresShell::RecreateFramesFor(nsIContent* aContent)
{
NS_ENSURE_TRUE(mPresContext, NS_ERROR_FAILURE);
if (!mDidInitialize) {
// Nothing to do here. In fact, if we proceed and aContent is the
// root we will crash.
return NS_OK;
}
// Don't call RecreateFramesForContent since that is not exported and we want
// to keep the number of entrypoints down.
NS_ASSERTION(mViewManager, "Should have view manager");
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
nsAutoScriptBlocker scriptBlocker;
nsStyleChangeList changeList;
changeList.AppendChange(nullptr, aContent, nsChangeHint_ReconstructFrame);
// Mark ourselves as not safe to flush while we're doing frame construction.
++mChangeNestCount;
RestyleManager* restyleManager = mPresContext->RestyleManager();
nsresult rv = restyleManager->ProcessRestyledFrames(changeList);
restyleManager->FlushOverflowChangedTracker();
--mChangeNestCount;
return rv;
}
void
nsIPresShell::PostRecreateFramesFor(Element* aElement)
{
mPresContext->RestyleManager()->PostRestyleEvent(aElement, nsRestyleHint(0),
nsChangeHint_ReconstructFrame);
}
void
nsIPresShell::RestyleForAnimation(Element* aElement, nsRestyleHint aHint)
{
mPresContext->RestyleManager()->PostAnimationRestyleEvent(aElement, aHint,
NS_STYLE_HINT_NONE);
}
void
PresShell::ClearFrameRefs(nsIFrame* aFrame)
{
mPresContext->EventStateManager()->ClearFrameRefs(aFrame);
nsWeakFrame* weakFrame = mWeakFrames;
while (weakFrame) {
nsWeakFrame* prev = weakFrame->GetPreviousWeakFrame();
if (weakFrame->GetFrame() == aFrame) {
// This removes weakFrame from mWeakFrames.
weakFrame->Clear(this);
}
weakFrame = prev;
}
}
already_AddRefed<nsRenderingContext>
PresShell::GetReferenceRenderingContext()
{
nsDeviceContext* devCtx = mPresContext->DeviceContext();
nsRefPtr<nsRenderingContext> rc;
if (mPresContext->IsScreen()) {
rc = new nsRenderingContext();
rc->Init(devCtx, gfxPlatform::GetPlatform()->ScreenReferenceSurface());
} else {
devCtx->CreateRenderingContext(*getter_AddRefs(rc));
}
return rc.forget();
}
nsresult
PresShell::GoToAnchor(const nsAString& aAnchorName, bool aScroll)
{
if (!mDocument) {
return NS_ERROR_FAILURE;
}
const Element *root = mDocument->GetRootElement();
if (root && root->IsSVG(nsGkAtoms::svg)) {
// We need to execute this even if there is an empty anchor name
// so that any existing SVG fragment identifier effect is removed
if (SVGFragmentIdentifier::ProcessFragmentIdentifier(mDocument, aAnchorName)) {
return NS_OK;
}
}
// Hold a reference to the ESM in case event dispatch tears us down.
nsRefPtr<nsEventStateManager> esm = mPresContext->EventStateManager();
if (aAnchorName.IsEmpty()) {
NS_ASSERTION(!aScroll, "can't scroll to empty anchor name");
esm->SetContentState(nullptr, NS_EVENT_STATE_URLTARGET);
return NS_OK;
}
nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryInterface(mDocument);
nsresult rv = NS_OK;
nsCOMPtr<nsIContent> content;
// Search for an element with a matching "id" attribute
if (mDocument) {
content = mDocument->GetElementById(aAnchorName);
}
// Search for an anchor element with a matching "name" attribute
if (!content && htmlDoc) {
nsCOMPtr<nsIDOMNodeList> list;
// Find a matching list of named nodes
rv = htmlDoc->GetElementsByName(aAnchorName, getter_AddRefs(list));
if (NS_SUCCEEDED(rv) && list) {
uint32_t i;
// Loop through the named nodes looking for the first anchor
for (i = 0; true; i++) {
nsCOMPtr<nsIDOMNode> node;
rv = list->Item(i, getter_AddRefs(node));
if (!node) { // End of list
break;
}
// Ensure it's an anchor element
content = do_QueryInterface(node);
if (content) {
if (content->Tag() == nsGkAtoms::a && content->IsHTML()) {
break;
}
content = nullptr;
}
}
}
}
// Search for anchor in the HTML namespace with a matching name
if (!content && !htmlDoc)
{
nsCOMPtr<nsIDOMDocument> doc = do_QueryInterface(mDocument);
nsCOMPtr<nsIDOMNodeList> list;
NS_NAMED_LITERAL_STRING(nameSpace, "http://www.w3.org/1999/xhtml");
// Get the list of anchor elements
rv = doc->GetElementsByTagNameNS(nameSpace, NS_LITERAL_STRING("a"), getter_AddRefs(list));
if (NS_SUCCEEDED(rv) && list) {
uint32_t i;
// Loop through the named nodes looking for the first anchor
for (i = 0; true; i++) {
nsCOMPtr<nsIDOMNode> node;
rv = list->Item(i, getter_AddRefs(node));
if (!node) { // End of list
break;
}
// Compare the name attribute
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(node);
nsAutoString value;
if (element && NS_SUCCEEDED(element->GetAttribute(NS_LITERAL_STRING("name"), value))) {
if (value.Equals(aAnchorName)) {
content = do_QueryInterface(element);
break;
}
}
}
}
}
esm->SetContentState(content, NS_EVENT_STATE_URLTARGET);
#ifdef ACCESSIBILITY
nsIContent *anchorTarget = content;
#endif
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (rootScroll && rootScroll->DidHistoryRestore()) {
// Scroll position restored from history trumps scrolling to anchor.
aScroll = false;
rootScroll->ClearDidHistoryRestore();
}
if (content) {
if (aScroll) {
rv = ScrollContentIntoView(content,
ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
ScrollAxis(),
ANCHOR_SCROLL_FLAGS);
NS_ENSURE_SUCCESS(rv, rv);
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (rootScroll) {
mLastAnchorScrolledTo = content;
mLastAnchorScrollPositionY = rootScroll->GetScrollPosition().y;
}
}
// Should we select the target? This action is controlled by a
// preference: the default is to not select.
bool selectAnchor = Preferences::GetBool("layout.selectanchor");
// Even if select anchor pref is false, we must still move the
// caret there. That way tabbing will start from the new
// location
nsRefPtr<nsIDOMRange> jumpToRange = new nsRange(mDocument);
while (content && content->GetFirstChild()) {
content = content->GetFirstChild();
}
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(content));
NS_ASSERTION(node, "No nsIDOMNode for descendant of anchor");
jumpToRange->SelectNodeContents(node);
// Select the anchor
nsISelection* sel = mSelection->
GetSelection(nsISelectionController::SELECTION_NORMAL);
if (sel) {
sel->RemoveAllRanges();
sel->AddRange(jumpToRange);
if (!selectAnchor) {
// Use a caret (collapsed selection) at the start of the anchor
sel->CollapseToStart();
}
}
// Selection is at anchor.
// Now focus the document itself if focus is on an element within it.
nsPIDOMWindow *win = mDocument->GetWindow();
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && win) {
nsCOMPtr<nsIDOMWindow> focusedWindow;
fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
if (SameCOMIdentity(win, focusedWindow)) {
fm->ClearFocus(focusedWindow);
}
}
// If the target is an animation element, activate the animation
if (content->IsNodeOfType(nsINode::eANIMATION)) {
SVGContentUtils::ActivateByHyperlink(content.get());
}
} else {
rv = NS_ERROR_FAILURE;
NS_NAMED_LITERAL_STRING(top, "top");
if (nsContentUtils::EqualsIgnoreASCIICase(aAnchorName, top)) {
// Scroll to the top/left if aAnchorName is "top" and there is no element
// with such a name or id.
rv = NS_OK;
nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
// Check |aScroll| after setting |rv| so we set |rv| to the same
// thing whether or not |aScroll| is true.
if (aScroll && sf) {
// Scroll to the top of the page
sf->ScrollTo(nsPoint(0, 0), nsIScrollableFrame::INSTANT);
}
}
}
#ifdef ACCESSIBILITY
if (anchorTarget) {
nsAccessibilityService* accService = AccService();
if (accService)
accService->NotifyOfAnchorJumpTo(anchorTarget);
}
#endif
return rv;
}
nsresult
PresShell::ScrollToAnchor()
{
if (!mLastAnchorScrolledTo) {
return NS_OK;
}
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (!rootScroll ||
mLastAnchorScrollPositionY != rootScroll->GetScrollPosition().y) {
return NS_OK;
}
nsresult rv = ScrollContentIntoView(mLastAnchorScrolledTo,
ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
ScrollAxis(),
ANCHOR_SCROLL_FLAGS);
mLastAnchorScrolledTo = nullptr;
return rv;
}
/*
* Helper (per-continuation) for ScrollContentIntoView.
*
* @param aContainerFrame [in] the frame which aRect is relative to
* @param aFrame [in] Frame whose bounds should be unioned
* @param aUseWholeLineHeightForInlines [in] if true, then for inline frames
* we should include the top of the line in the added rectangle
* @param aRect [inout] rect into which its bounds should be unioned
* @param aHaveRect [inout] whether aRect contains data yet
* @param aPrevBlock [inout] the block aLines is a line iterator for
* @param aLines [inout] the line iterator we're using
* @param aCurLine [inout] the line to start looking from in this iterator
*/
static void
AccumulateFrameBounds(nsIFrame* aContainerFrame,
nsIFrame* aFrame,
bool aUseWholeLineHeightForInlines,
nsRect& aRect,
bool& aHaveRect,
nsIFrame*& aPrevBlock,
nsAutoLineIterator& aLines,
int32_t& aCurLine)
{
nsIFrame* frame = aFrame;
nsRect frameBounds = nsRect(nsPoint(0, 0), aFrame->GetSize());
// If this is an inline frame and either the bounds height is 0 (quirks
// layout model) or aUseWholeLineHeightForInlines is set, we need to
// change the top of the bounds to include the whole line.
if (frameBounds.height == 0 || aUseWholeLineHeightForInlines) {
nsIFrame *prevFrame = aFrame;
nsIFrame *f = aFrame;
while (f && f->IsFrameOfType(nsIFrame::eLineParticipant) &&
!f->IsTransformed() && !f->IsPositioned()) {
prevFrame = f;
f = prevFrame->GetParent();
}
if (f != aFrame &&
f &&
f->GetType() == nsGkAtoms::blockFrame) {
// find the line containing aFrame and increase the top of |offset|.
if (f != aPrevBlock) {
aLines = f->GetLineIterator();
aPrevBlock = f;
aCurLine = 0;
}
if (aLines) {
int32_t index = aLines->FindLineContaining(prevFrame, aCurLine);
if (index >= 0) {
aCurLine = index;
nsIFrame *trash1;
int32_t trash2;
nsRect lineBounds;
uint32_t trash3;
if (NS_SUCCEEDED(aLines->GetLine(index, &trash1, &trash2,
lineBounds, &trash3))) {
frameBounds += frame->GetOffsetTo(f);
frame = f;
if (lineBounds.y < frameBounds.y) {
frameBounds.height = frameBounds.YMost() - lineBounds.y;
frameBounds.y = lineBounds.y;
}
}
}
}
}
}
nsRect transformedBounds = nsLayoutUtils::TransformFrameRectToAncestor(frame,
frameBounds, aContainerFrame);
if (aHaveRect) {
// We can't use nsRect::UnionRect since it drops empty rects on
// the floor, and we need to include them. (Thus we need
// aHaveRect to know when to drop the initial value on the floor.)
aRect.UnionRectEdges(aRect, transformedBounds);
} else {
aHaveRect = true;
aRect = transformedBounds;
}
}
static bool
ComputeNeedToScroll(nsIPresShell::WhenToScroll aWhenToScroll,
nscoord aLineSize,
nscoord aRectMin,
nscoord aRectMax,
nscoord aViewMin,
nscoord aViewMax) {
// See how the rect should be positioned vertically
if (nsIPresShell::SCROLL_ALWAYS == aWhenToScroll) {
// The caller wants the frame as visible as possible
return true;
} else if (nsIPresShell::SCROLL_IF_NOT_VISIBLE == aWhenToScroll) {
// Scroll only if no part of the frame is visible in this view
return aRectMax - aLineSize <= aViewMin ||
aRectMin + aLineSize >= aViewMax;
} else if (nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE == aWhenToScroll) {
// Scroll only if part of the frame is hidden and more can fit in view
return !(aRectMin >= aViewMin && aRectMax <= aViewMax) &&
std::min(aViewMax, aRectMax) - std::max(aRectMin, aViewMin) < aViewMax - aViewMin;
}
return false;
}
static nscoord
ComputeWhereToScroll(int16_t aWhereToScroll,
nscoord aOriginalCoord,
nscoord aRectMin,
nscoord aRectMax,
nscoord aViewMin,
nscoord aViewMax,
nscoord* aRangeMin,
nscoord* aRangeMax) {
nscoord resultCoord = aOriginalCoord;
// Allow the scroll operation to land anywhere that
// makes the whole rectangle visible.
if (nsIPresShell::SCROLL_MINIMUM == aWhereToScroll) {
if (aRectMin < aViewMin) {
// Scroll up so the frame's top edge is visible
resultCoord = aRectMin;
} else if (aRectMax > aViewMax) {
// Scroll down so the frame's bottom edge is visible. Make sure the
// frame's top edge is still visible
resultCoord = aOriginalCoord + aRectMax - aViewMax;
if (resultCoord > aRectMin) {
resultCoord = aRectMin;
}
}
} else {
nscoord frameAlignCoord =
NSToCoordRound(aRectMin + (aRectMax - aRectMin) * (aWhereToScroll / 100.0f));
resultCoord = NSToCoordRound(frameAlignCoord - (aViewMax - aViewMin) * (
aWhereToScroll / 100.0f));
}
nscoord scrollPortLength = aViewMax - aViewMin;
// Force the scroll range to extend to include resultCoord.
*aRangeMin = std::min(resultCoord, aRectMax - scrollPortLength);
*aRangeMax = std::max(resultCoord, aRectMin);
return resultCoord;
}
/**
* This function takes a scrollable frame, a rect in the coordinate system
* of the scrolled frame, and a desired percentage-based scroll
* position and attempts to scroll the rect to that position in the
* scrollport.
*
* This needs to work even if aRect has a width or height of zero.
*/
static void ScrollToShowRect(nsIFrame* aFrame,
nsIScrollableFrame* aFrameAsScrollable,
const nsRect& aRect,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
nsPoint scrollPt = aFrameAsScrollable->GetScrollPosition();
nsRect visibleRect(scrollPt,
aFrameAsScrollable->GetScrollPositionClampingScrollPortSize());
// If this is the root scroll frame, make sure to take into account the
// content document fixed position margins. When set, these indicate that
// chrome is obscuring the viewport.
nsRect targetRect(aRect);
nsIPresShell *presShell = aFrame->PresContext()->PresShell();
if (aFrameAsScrollable == presShell->GetRootScrollFrameAsScrollable()) {
targetRect.Inflate(presShell->GetContentDocumentFixedPositionMargins());
}
nsSize lineSize;
// Don't call GetLineScrollAmount unless we actually need it. Not only
// does this save time, but it's not safe to call GetLineScrollAmount
// during reflow (because it depends on font size inflation and doesn't
// use the in-reflow-safe font-size inflation path). If we did call it,
// it would assert and possible give the wrong result.
if (aVertical.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE ||
aHorizontal.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE) {
lineSize = aFrameAsScrollable->GetLineScrollAmount();
}
ScrollbarStyles ss = aFrameAsScrollable->GetScrollbarStyles();
nsRect allowedRange(scrollPt, nsSize(0, 0));
bool needToScroll = false;
uint32_t directions = aFrameAsScrollable->GetPerceivedScrollingDirections();
if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN) &&
(!aVertical.mOnlyIfPerceivedScrollableDirection ||
(directions & nsIScrollableFrame::VERTICAL))) {
if (ComputeNeedToScroll(aVertical.mWhenToScroll,
lineSize.height,
targetRect.y,
targetRect.YMost(),
visibleRect.y,
visibleRect.YMost())) {
nscoord maxHeight;
scrollPt.y = ComputeWhereToScroll(aVertical.mWhereToScroll,
scrollPt.y,
targetRect.y,
targetRect.YMost(),
visibleRect.y,
visibleRect.YMost(),
&allowedRange.y, &maxHeight);
allowedRange.height = maxHeight - allowedRange.y;
needToScroll = true;
}
}
if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN) &&
(!aHorizontal.mOnlyIfPerceivedScrollableDirection ||
(directions & nsIScrollableFrame::HORIZONTAL))) {
if (ComputeNeedToScroll(aHorizontal.mWhenToScroll,
lineSize.width,
targetRect.x,
targetRect.XMost(),
visibleRect.x,
visibleRect.XMost())) {
nscoord maxWidth;
scrollPt.x = ComputeWhereToScroll(aHorizontal.mWhereToScroll,
scrollPt.x,
targetRect.x,
targetRect.XMost(),
visibleRect.x,
visibleRect.XMost(),
&allowedRange.x, &maxWidth);
allowedRange.width = maxWidth - allowedRange.x;
needToScroll = true;
}
}
// If we don't need to scroll, then don't try since it might cancel
// a current smooth scroll operation.
if (needToScroll) {
aFrameAsScrollable->ScrollTo(scrollPt, nsIScrollableFrame::INSTANT, &allowedRange);
}
}
static void
DeleteScrollIntoViewData(void* aObject, nsIAtom* aPropertyName,
void* aPropertyValue, void* aData)
{
PresShell::ScrollIntoViewData* data =
static_cast<PresShell::ScrollIntoViewData*>(aPropertyValue);
delete data;
}
nsresult
PresShell::ScrollContentIntoView(nsIContent* aContent,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
NS_ENSURE_TRUE(aContent, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIDocument> currentDoc = aContent->GetCurrentDoc();
NS_ENSURE_STATE(currentDoc);
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
}
mContentToScrollTo = aContent;
ScrollIntoViewData* data = new ScrollIntoViewData();
data->mContentScrollVAxis = aVertical;
data->mContentScrollHAxis = aHorizontal;
data->mContentToScrollToFlags = aFlags;
if (NS_FAILED(mContentToScrollTo->SetProperty(nsGkAtoms::scrolling, data,
::DeleteScrollIntoViewData))) {
mContentToScrollTo = nullptr;
}
// Flush layout and attempt to scroll in the process.
currentDoc->SetNeedLayoutFlush();
currentDoc->FlushPendingNotifications(Flush_InterruptibleLayout);
// If mContentToScrollTo is non-null, that means we interrupted the reflow
// (or suppressed it altogether because we're suppressing interruptible
// flushes right now) and won't necessarily get the position correct, but do
// a best-effort scroll here. The other option would be to do this inside
// FlushPendingNotifications, but I'm not sure the repeated scrolling that
// could trigger if reflows keep getting interrupted would be more desirable
// than a single best-effort scroll followed by one final scroll on the first
// completed reflow.
if (mContentToScrollTo) {
DoScrollContentIntoView();
}
return NS_OK;
}
void
PresShell::DoScrollContentIntoView()
{
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIFrame* frame = mContentToScrollTo->GetPrimaryFrame();
if (!frame) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
return;
}
if (frame->GetStateBits() & NS_FRAME_FIRST_REFLOW) {
// The reflow flush before this scroll got interrupted, and this frame's
// coords and size are all zero, and it has no content showing anyway.
// Don't bother scrolling to it. We'll try again when we finish up layout.
return;
}
// Make sure we skip 'frame' ... if it's scrollable, we should use its
// scrollable ancestor as the container.
nsIFrame* container =
nsLayoutUtils::GetClosestFrameOfType(frame->GetParent(), nsGkAtoms::scrollFrame);
if (!container) {
// nothing can be scrolled
return;
}
ScrollIntoViewData* data = static_cast<ScrollIntoViewData*>(
mContentToScrollTo->GetProperty(nsGkAtoms::scrolling));
if (MOZ_UNLIKELY(!data)) {
mContentToScrollTo = nullptr;
return;
}
// This is a two-step process.
// Step 1: Find the bounds of the rect we want to scroll into view. For
// example, for an inline frame we may want to scroll in the whole
// line, or we may want to scroll multiple lines into view.
// Step 2: Walk container frame and its ancestors and scroll them
// appropriately.
// frameBounds is relative to container. We're assuming
// that scrollframes don't split so every continuation of frame will
// be a descendant of container. (Things would still mostly work
// even if that assumption was false.)
nsRect frameBounds;
bool haveRect = false;
bool useWholeLineHeightForInlines =
data->mContentScrollVAxis.mWhenToScroll != nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE;
// Reuse the same line iterator across calls to AccumulateFrameBounds. We set
// it every time we detect a new block (stored in prevBlock).
nsIFrame* prevBlock = nullptr;
nsAutoLineIterator lines;
// The last line we found a continuation on in |lines|. We assume that later
// continuations cannot come on earlier lines.
int32_t curLine = 0;
do {
AccumulateFrameBounds(container, frame, useWholeLineHeightForInlines,
frameBounds, haveRect, prevBlock, lines, curLine);
} while ((frame = frame->GetNextContinuation()));
ScrollFrameRectIntoView(container, frameBounds, data->mContentScrollVAxis,
data->mContentScrollHAxis,
data->mContentToScrollToFlags);
}
bool
PresShell::ScrollFrameRectIntoView(nsIFrame* aFrame,
const nsRect& aRect,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
bool didScroll = false;
// This function needs to work even if rect has a width or height of 0.
nsRect rect = aRect;
nsIFrame* container = aFrame;
// Walk up the frame hierarchy scrolling the rect into view and
// keeping rect relative to container
do {
nsIScrollableFrame* sf = do_QueryFrame(container);
if (sf) {
nsPoint oldPosition = sf->GetScrollPosition();
ScrollToShowRect(container, sf, rect - sf->GetScrolledFrame()->GetPosition(),
aVertical, aHorizontal, aFlags);
nsPoint newPosition = sf->GetScrollPosition();
// If the scroll position increased, that means our content moved up,
// so our rect's offset should decrease
rect += oldPosition - newPosition;
if (oldPosition != newPosition) {
didScroll = true;
}
// only scroll one container when this flag is set
if (aFlags & nsIPresShell::SCROLL_FIRST_ANCESTOR_ONLY) {
break;
}
}
nsIFrame* parent;
if (container->IsTransformed()) {
container->GetTransformMatrix(nullptr, &parent);
rect = nsLayoutUtils::TransformFrameRectToAncestor(container, rect, parent);
} else {
rect += container->GetPosition();
parent = container->GetParent();
}
if (!parent && !(aFlags & nsIPresShell::SCROLL_NO_PARENT_FRAMES)) {
nsPoint extraOffset(0,0);
parent = nsLayoutUtils::GetCrossDocParentFrame(container, &extraOffset);
if (parent) {
int32_t APD = container->PresContext()->AppUnitsPerDevPixel();
int32_t parentAPD = parent->PresContext()->AppUnitsPerDevPixel();
rect = rect.ConvertAppUnitsRoundOut(APD, parentAPD);
rect += extraOffset;
}
}
container = parent;
} while (container);
return didScroll;
}
nsRectVisibility
PresShell::GetRectVisibility(nsIFrame* aFrame,
const nsRect &aRect,
nscoord aMinTwips) const
{
NS_ASSERTION(aFrame->PresContext() == GetPresContext(),
"prescontext mismatch?");
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
NS_ASSERTION(rootFrame,
"How can someone have a frame for this presshell when there's no root?");
nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
nsRect scrollPortRect;
if (sf) {
scrollPortRect = sf->GetScrollPortRect();
nsIFrame* f = do_QueryFrame(sf);
scrollPortRect += f->GetOffsetTo(rootFrame);
} else {
scrollPortRect = nsRect(nsPoint(0,0), rootFrame->GetSize());
}
nsRect r = aRect + aFrame->GetOffsetTo(rootFrame);
// If aRect is entirely visible then we don't need to ensure that
// at least aMinTwips of it is visible
if (scrollPortRect.Contains(r))
return nsRectVisibility_kVisible;
nsRect insetRect = scrollPortRect;
insetRect.Deflate(aMinTwips, aMinTwips);
if (r.YMost() <= insetRect.y)
return nsRectVisibility_kAboveViewport;
if (r.y >= insetRect.YMost())
return nsRectVisibility_kBelowViewport;
if (r.XMost() <= insetRect.x)
return nsRectVisibility_kLeftOfViewport;
if (r.x >= insetRect.XMost())
return nsRectVisibility_kRightOfViewport;
return nsRectVisibility_kVisible;
}
void
PresShell::ScheduleViewManagerFlush()
{
nsPresContext* presContext = GetPresContext();
if (presContext) {
presContext->RefreshDriver()->ScheduleViewManagerFlush();
}
if (mDocument) {
mDocument->SetNeedLayoutFlush();
}
}
void
PresShell::DispatchSynthMouseMove(WidgetGUIEvent* aEvent,
bool aFlushOnHoverChange)
{
RestyleManager* restyleManager = mPresContext->RestyleManager();
uint32_t hoverGenerationBefore = restyleManager->GetHoverGeneration();
nsEventStatus status;
nsView* targetView = nsView::GetViewFor(aEvent->widget);
if (!targetView)
return;
targetView->GetViewManager()->DispatchEvent(aEvent, targetView, &status);
if (aFlushOnHoverChange &&
hoverGenerationBefore != restyleManager->GetHoverGeneration()) {
// Flush so that the resulting reflow happens now so that our caller
// can suppress any synthesized mouse moves caused by that reflow.
FlushPendingNotifications(Flush_Layout);
}
}
void
PresShell::ClearMouseCaptureOnView(nsView* aView)
{
if (gCaptureInfo.mContent) {
if (aView) {
// if a view was specified, ensure that the captured content is within
// this view.
nsIFrame* frame = gCaptureInfo.mContent->GetPrimaryFrame();
if (frame) {
nsView* view = frame->GetClosestView();
// if there is no view, capturing won't be handled any more, so
// just release the capture.
if (view) {
do {
if (view == aView) {
NS_RELEASE(gCaptureInfo.mContent);
// the view containing the captured content likely disappeared so
// disable capture for now.
gCaptureInfo.mAllowed = false;
break;
}
view = view->GetParent();
} while (view);
// return if the view wasn't found
return;
}
}
}
NS_RELEASE(gCaptureInfo.mContent);
}
// disable mouse capture until the next mousedown as a dialog has opened
// or a drag has started. Otherwise, someone could start capture during
// the modal dialog or drag.
gCaptureInfo.mAllowed = false;
}
void
nsIPresShell::ClearMouseCapture(nsIFrame* aFrame)
{
if (!gCaptureInfo.mContent) {
gCaptureInfo.mAllowed = false;
return;
}
// null frame argument means clear the capture
if (!aFrame) {
NS_RELEASE(gCaptureInfo.mContent);
gCaptureInfo.mAllowed = false;
return;
}
nsIFrame* capturingFrame = gCaptureInfo.mContent->GetPrimaryFrame();
if (!capturingFrame) {
NS_RELEASE(gCaptureInfo.mContent);
gCaptureInfo.mAllowed = false;
return;
}
if (nsLayoutUtils::IsAncestorFrameCrossDoc(aFrame, capturingFrame)) {
NS_RELEASE(gCaptureInfo.mContent);
gCaptureInfo.mAllowed = false;
}
}
nsresult
PresShell::CaptureHistoryState(nsILayoutHistoryState** aState)
{
NS_PRECONDITION(nullptr != aState, "null state pointer");
// We actually have to mess with the docshell here, since we want to
// store the state back in it.
// XXXbz this isn't really right, since this is being called in the
// content viewer's Hide() method... by that point the docshell's
// state could be wrong. We should sort out a better ownership
// model for the layout history state.
nsCOMPtr<nsISupports> container = mPresContext->GetContainer();
if (!container)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(container));
if (!docShell)
return NS_ERROR_FAILURE;
nsCOMPtr<nsILayoutHistoryState> historyState;
docShell->GetLayoutHistoryState(getter_AddRefs(historyState));
if (!historyState) {
// Create the document state object
historyState = NS_NewLayoutHistoryState();
docShell->SetLayoutHistoryState(historyState);
}
*aState = historyState;
NS_IF_ADDREF(*aState);
// Capture frame state for the entire frame hierarchy
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) return NS_OK;
mFrameConstructor->CaptureFrameState(rootFrame, historyState);
return NS_OK;
}
void
PresShell::UnsuppressAndInvalidate()
{
// Note: We ignore the EnsureVisible check for resource documents, because
// they won't have a docshell, so they'll always fail EnsureVisible.
if ((!mDocument->IsResourceDoc() && !mPresContext->EnsureVisible()) ||
mHaveShutDown) {
// No point; we're about to be torn down anyway.
return;
}
if (!mDocument->IsResourceDoc()) {
// Notify observers that a new page is about to be drawn. Execute this
// as soon as it is safe to run JS, which is guaranteed to be before we
// go back to the event loop and actually draw the page.
nsContentUtils::AddScriptRunner(new nsBeforeFirstPaintDispatcher(mDocument));
}
mPaintingSuppressed = false;
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
// let's assume that outline on a root frame is not supported
rootFrame->InvalidateFrame();
if (mCaretEnabled && mCaret) {
mCaret->CheckCaretDrawingState();
}
}
// now that painting is unsuppressed, focus may be set on the document
nsPIDOMWindow *win = mDocument->GetWindow();
if (win)
win->SetReadyForFocus();
if (!mHaveShutDown) {
SynthesizeMouseMove(false);
ScheduleImageVisibilityUpdate();
}
}
void
PresShell::UnsuppressPainting()
{
if (mPaintSuppressionTimer) {
mPaintSuppressionTimer->Cancel();
mPaintSuppressionTimer = nullptr;
}
if (mIsDocumentGone || !mPaintingSuppressed)
return;
// If we have reflows pending, just wait until we process
// the reflows and get all the frames where we want them
// before actually unlocking the painting. Otherwise
// go ahead and unlock now.
if (!mDirtyRoots.IsEmpty())
mShouldUnsuppressPainting = true;
else
UnsuppressAndInvalidate();
}
// Post a request to handle an arbitrary callback after reflow has finished.
nsresult
PresShell::PostReflowCallback(nsIReflowCallback* aCallback)
{
void* result = AllocateMisc(sizeof(nsCallbackEventRequest));
nsCallbackEventRequest* request = (nsCallbackEventRequest*)result;
request->callback = aCallback;
request->next = nullptr;
if (mLastCallbackEventRequest) {
mLastCallbackEventRequest = mLastCallbackEventRequest->next = request;
} else {
mFirstCallbackEventRequest = request;
mLastCallbackEventRequest = request;
}
return NS_OK;
}
void
PresShell::CancelReflowCallback(nsIReflowCallback* aCallback)
{
nsCallbackEventRequest* before = nullptr;
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
while(node)
{
nsIReflowCallback* callback = node->callback;
if (callback == aCallback)
{
nsCallbackEventRequest* toFree = node;
if (node == mFirstCallbackEventRequest) {
node = node->next;
mFirstCallbackEventRequest = node;
NS_ASSERTION(before == nullptr, "impossible");
} else {
node = node->next;
before->next = node;
}
if (toFree == mLastCallbackEventRequest) {
mLastCallbackEventRequest = before;
}
FreeMisc(sizeof(nsCallbackEventRequest), toFree);
} else {
before = node;
node = node->next;
}
}
}
void
PresShell::CancelPostedReflowCallbacks()
{
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeMisc(sizeof(nsCallbackEventRequest), node);
if (callback) {
callback->ReflowCallbackCanceled();
}
}
}
void
PresShell::HandlePostedReflowCallbacks(bool aInterruptible)
{
bool shouldFlush = false;
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeMisc(sizeof(nsCallbackEventRequest), node);
if (callback) {
if (callback->ReflowFinished()) {
shouldFlush = true;
}
}
}
mozFlushType flushType =
aInterruptible ? Flush_InterruptibleLayout : Flush_Layout;
if (shouldFlush && !mIsDestroying) {
FlushPendingNotifications(flushType);
}
}
bool
PresShell::IsSafeToFlush() const
{
// Not safe if we are reflowing or in the middle of frame construction
bool isSafeToFlush = !mIsReflowing &&
!mChangeNestCount;
if (isSafeToFlush) {
// Not safe if we are painting
nsViewManager* viewManager = GetViewManager();
if (viewManager) {
bool isPainting = false;
viewManager->IsPainting(isPainting);
if (isPainting) {
isSafeToFlush = false;
}
}
}
return isSafeToFlush;
}
void
PresShell::FlushPendingNotifications(mozFlushType aType)
{
// by default, flush animations if aType >= Flush_Style
mozilla::ChangesToFlush flush(aType, aType >= Flush_Style);
FlushPendingNotifications(flush);
}
void
PresShell::FlushPendingNotifications(mozilla::ChangesToFlush aFlush)
{
if (mIsZombie) {
return;
}
/**
* VERY IMPORTANT: If you add some sort of new flushing to this
* method, make sure to add the relevant SetNeedLayoutFlush or
* SetNeedStyleFlush calls on the document.
*/
mozFlushType flushType = aFlush.mFlushType;
#ifdef MOZ_ENABLE_PROFILER_SPS
static const char flushTypeNames[][20] = {
"Content",
"ContentAndNotify",
"Style",
"InterruptibleLayout",
"Layout",
"Display"
};
// Make sure that we don't miss things added to mozFlushType!
MOZ_ASSERT(static_cast<uint32_t>(flushType) <= ArrayLength(flushTypeNames));
PROFILER_LABEL_PRINTF("layout", "Flush", "(Flush_%s)",
flushTypeNames[flushType - 1]);
#endif
#ifdef ACCESSIBILITY
#ifdef DEBUG
nsAccessibilityService* accService = GetAccService();
if (accService) {
NS_ASSERTION(!accService->IsProcessingRefreshDriverNotification(),
"Flush during accessible tree update!");
}
#endif
#endif
NS_ASSERTION(flushType >= Flush_Frames, "Why did we get called?");
bool isSafeToFlush = IsSafeToFlush();
// If layout could possibly trigger scripts, then it's only safe to flush if
// it's safe to run script.
bool hasHadScriptObject;
if (mDocument->GetScriptHandlingObject(hasHadScriptObject) ||
hasHadScriptObject) {
isSafeToFlush = isSafeToFlush && nsContentUtils::IsSafeToRunScript();
}
NS_ASSERTION(!isSafeToFlush || mViewManager, "Must have view manager");
// Make sure the view manager stays alive.
nsRefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
if (isSafeToFlush && mViewManager) {
// Processing pending notifications can kill us, and some callers only
// hold weak refs when calling FlushPendingNotifications(). :(
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
if (mResizeEvent.IsPending()) {
FireResizeEvent();
if (mIsDestroying) {
return;
}
}
// We need to make sure external resource documents are flushed too (for
// example, svg filters that reference a filter in an external document
// need the frames in the external document to be constructed for the
// filter to work). We only need external resources to be flushed when the
// main document is flushing >= Flush_Frames, so we flush external
// resources here instead of nsDocument::FlushPendingNotifications.
mDocument->FlushExternalResources(flushType);
// Force flushing of any pending content notifications that might have
// queued up while our event was pending. That will ensure that we don't
// construct frames for content right now that's still waiting to be
// notified on,
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
// Process pending restyles, since any flush of the presshell wants
// up-to-date style data.
if (!mIsDestroying) {
mViewManager->FlushDelayedResize(false);
mPresContext->FlushPendingMediaFeatureValuesChanged();
// Flush any pending update of the user font set, since that could
// cause style changes (for updating ex/ch units, and to cause a
// reflow).
mPresContext->FlushUserFontSet();
// Flush any requested SMIL samples.
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->FlushResampleRequests();
}
if (aFlush.mFlushAnimations &&
nsLayoutUtils::AreAsyncAnimationsEnabled() &&
!mPresContext->StyleUpdateForAllAnimationsIsUpToDate()) {
mPresContext->AnimationManager()->
FlushAnimations(CommonAnimationManager::Cannot_Throttle);
mPresContext->TransitionManager()->
FlushTransitions(CommonAnimationManager::Cannot_Throttle);
mPresContext->TickLastStyleUpdateForAllAnimations();
}
// The FlushResampleRequests() above flushed style changes.
if (!mIsDestroying) {
nsAutoScriptBlocker scriptBlocker;
mFrameConstructor->CreateNeededFrames();
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
}
// Dispatch any 'animationstart' events those (or earlier) restyles
// queued up.
if (!mIsDestroying) {
mPresContext->AnimationManager()->DispatchEvents();
}
// Process whatever XBL constructors those restyles queued up. This
// ensures that onload doesn't fire too early and that we won't do extra
// reflows after those constructors run.
if (!mIsDestroying) {
mDocument->BindingManager()->ProcessAttachedQueue();
}
// Now those constructors or events might have posted restyle
// events. At the same time, we still need up-to-date style data.
// In particular, reflow depends on style being completely up to
// date. If it's not, then style context reparenting, which can
// happen during reflow, might suddenly pick up the new rules and
// we'll end up with frames whose style doesn't match the frame
// type.
if (!mIsDestroying) {
nsAutoScriptBlocker scriptBlocker;
mFrameConstructor->CreateNeededFrames();
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
// There might be more pending constructors now, but we're not going to
// worry about them. They can't be triggered during reflow, so we should
// be good.
if (flushType >= (mSuppressInterruptibleReflows ? Flush_Layout : Flush_InterruptibleLayout) &&
!mIsDestroying) {
mFrameConstructor->RecalcQuotesAndCounters();
mViewManager->FlushDelayedResize(true);
if (ProcessReflowCommands(flushType < Flush_Layout) && mContentToScrollTo) {
// We didn't get interrupted. Go ahead and scroll to our content
DoScrollContentIntoView();
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
}
} else if (!mIsDestroying && mSuppressInterruptibleReflows &&
flushType == Flush_InterruptibleLayout) {
// We suppressed this flush, but the document thinks it doesn't
// need to flush anymore. Let it know what's really going on.
mDocument->SetNeedLayoutFlush();
}
if (flushType >= Flush_Layout) {
if (!mIsDestroying) {
mViewManager->UpdateWidgetGeometry();
}
}
}
}
void
PresShell::CharacterDataWillChange(nsIDocument *aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected CharacterDataChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
if (mCaret) {
// Invalidate the caret's current location before we call into the frame
// constructor. It is important to do this now, and not wait until the
// resulting reflow, because this call causes continuation frames of the
// text frame the caret is in to forget what part of the content they
// refer to, making it hard for them to return the correct continuation
// frame to the caret.
//
// It's also important to do this before the content actually changes, since
// in bidi text the caret needs to look at the content to determine its
// position and shape.
mCaret->InvalidateOutsideCaret();
}
}
void
PresShell::CharacterDataChanged(nsIDocument *aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected CharacterDataChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
nsIContent *container = aContent->GetParent();
uint32_t selectorFlags =
container ? (container->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
if (selectorFlags != 0 && !aContent->IsRootOfAnonymousSubtree()) {
Element* element = container->AsElement();
if (aInfo->mAppend && !aContent->GetNextSibling())
mPresContext->RestyleManager()->RestyleForAppend(element, aContent);
else
mPresContext->RestyleManager()->RestyleForInsertOrChange(element, aContent);
}
mFrameConstructor->CharacterDataChanged(aContent, aInfo);
VERIFY_STYLE_TREE;
}
void
PresShell::ContentStateChanged(nsIDocument* aDocument,
nsIContent* aContent,
nsEventStates aStateMask)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentStateChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->ContentStateChanged(aContent, aStateMask);
VERIFY_STYLE_TREE;
}
}
void
PresShell::DocumentStatesChanged(nsIDocument* aDocument,
nsEventStates aStateMask)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected DocumentStatesChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
if (mDidInitialize &&
mStyleSet->HasDocumentStateDependentStyle(mPresContext,
mDocument->GetRootElement(),
aStateMask)) {
mPresContext->RestyleManager()->PostRestyleEvent(mDocument->GetRootElement(),
eRestyle_Subtree,
NS_STYLE_HINT_NONE);
VERIFY_STYLE_TREE;
}
if (aStateMask.HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE)) {
nsIFrame* root = mFrameConstructor->GetRootFrame();
if (root) {
root->SchedulePaint();
}
}
}
void
PresShell::AttributeWillChange(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected AttributeWillChange");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeWillChange(aElement, aNameSpaceID,
aAttribute, aModType);
VERIFY_STYLE_TREE;
}
}
void
PresShell::AttributeChanged(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected AttributeChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeChanged(aElement, aNameSpaceID,
aAttribute, aModType);
VERIFY_STYLE_TREE;
}
}
void
PresShell::ContentAppended(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentAppended");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
NS_PRECONDITION(aContainer, "must have container");
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
mPresContext->RestyleManager()->
RestyleForAppend(aContainer->AsElement(), aFirstNewContent);
mFrameConstructor->ContentAppended(aContainer, aFirstNewContent, true);
if (static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument) &&
aFirstNewContent->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
NotifyFontSizeInflationEnabledIsDirty();
}
VERIFY_STYLE_TREE;
}
void
PresShell::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentInserted");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
if (aContainer) {
mPresContext->RestyleManager()->
RestyleForInsertOrChange(aContainer->AsElement(), aChild);
}
mFrameConstructor->ContentInserted(aContainer, aChild, nullptr, true);
if (((!aContainer && aDocument) ||
(static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument))) &&
aChild->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
NotifyFontSizeInflationEnabledIsDirty();
}
VERIFY_STYLE_TREE;
}
void
PresShell::ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentRemoved");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
// Make sure that the caret doesn't leave a turd where the child used to be.
if (mCaret) {
mCaret->InvalidateOutsideCaret();
}
// Notify the ESM that the content has been removed, so that
// it can clean up any state related to the content.
// XXX_jwir3: There is no null check for aDocument necessary, since, even
// though by nsIMutationObserver, aDocument could be null, the
// precondition check that mDocument == aDocument ensures that
// aDocument will not be null (since mDocument can't be null unless
// we're still intializing).
mPresContext->EventStateManager()->ContentRemoved(aDocument, aChild);
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
nsIContent* oldNextSibling;
if (aContainer) {
oldNextSibling = aContainer->GetChildAt(aIndexInContainer);
} else {
oldNextSibling = nullptr;
}
if (aContainer && aContainer->IsElement()) {
mPresContext->RestyleManager()->
RestyleForRemove(aContainer->AsElement(), aChild, oldNextSibling);
}
bool didReconstruct;
mFrameConstructor->ContentRemoved(aContainer, aChild, oldNextSibling,
nsCSSFrameConstructor::REMOVE_CONTENT,
&didReconstruct);
if (((aContainer &&
static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument)) ||
aDocument) && aChild->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
NotifyFontSizeInflationEnabledIsDirty();
}
VERIFY_STYLE_TREE;
}
nsresult
PresShell::ReconstructFrames(void)
{
NS_PRECONDITION(!mFrameConstructor->GetRootFrame() || mDidInitialize,
"Must not have root frame before initial reflow");
if (!mDidInitialize) {
// Nothing to do here
return NS_OK;
}
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
nsAutoCauseReflowNotifier crNotifier(this);
mFrameConstructor->BeginUpdate();
nsresult rv = mFrameConstructor->ReconstructDocElementHierarchy();
VERIFY_STYLE_TREE;
mFrameConstructor->EndUpdate();
return rv;
}
void
nsIPresShell::ReconstructStyleDataInternal()
{
nsAutoTArray<nsRefPtr<mozilla::dom::Element>,1> scopeRoots;
mChangedScopeStyleRoots.SwapElements(scopeRoots);
if (mStylesHaveChanged) {
// If we need to restyle everything, no need to restyle individual
// scoped style roots.
scopeRoots.Clear();
}
mStylesHaveChanged = false;
if (mIsDestroying) {
// We don't want to mess with restyles at this point
return;
}
if (mPresContext) {
mPresContext->RebuildUserFontSet();
}
Element* root = mDocument->GetRootElement();
if (!mDidInitialize) {
// Nothing to do here, since we have no frames yet
return;
}
if (!root) {
// No content to restyle
return;
}
RestyleManager* restyleManager = mPresContext->RestyleManager();
if (scopeRoots.IsEmpty()) {
// If scopeRoots is empty, we know that mStylesHaveChanged was true at
// the beginning of this function, and that we need to restyle the whole
// document.
restyleManager->PostRestyleEvent(root, eRestyle_Subtree,
NS_STYLE_HINT_NONE);
} else {
for (uint32_t i = 0; i < scopeRoots.Length(); i++) {
Element* scopeRoot = scopeRoots[i];
restyleManager->PostRestyleEvent(scopeRoot, eRestyle_Subtree,
NS_STYLE_HINT_NONE);
}
}
}
void
nsIPresShell::ReconstructStyleDataExternal()
{
ReconstructStyleDataInternal();
}
void
PresShell::RecordStyleSheetChange(nsIStyleSheet* aStyleSheet)
{
if (mStylesHaveChanged)
return;
nsRefPtr<nsCSSStyleSheet> cssStyleSheet = do_QueryObject(aStyleSheet);
if (cssStyleSheet) {
Element* scopeElement = cssStyleSheet->GetScopeElement();
if (scopeElement) {
mChangedScopeStyleRoots.AppendElement(scopeElement);
return;
}
}
mStylesHaveChanged = true;
}
void
PresShell::StyleSheetAdded(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
bool aDocumentSheet)
{
// We only care when enabled sheets are added
NS_PRECONDITION(aStyleSheet, "Must have a style sheet!");
if (aStyleSheet->IsApplicable() && aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleSheetRemoved(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
bool aDocumentSheet)
{
// We only care when enabled sheets are removed
NS_PRECONDITION(aStyleSheet, "Must have a style sheet!");
if (aStyleSheet->IsApplicable() && aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleSheetApplicableStateChanged(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
bool aApplicable)
{
if (aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleRuleChanged(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aOldStyleRule,
nsIStyleRule* aNewStyleRule)
{
RecordStyleSheetChange(aStyleSheet);
}
void
PresShell::StyleRuleAdded(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule)
{
RecordStyleSheetChange(aStyleSheet);
}
void
PresShell::StyleRuleRemoved(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule)
{
RecordStyleSheetChange(aStyleSheet);
}
nsIFrame*
PresShell::GetRealPrimaryFrameFor(nsIContent* aContent) const
{
if (aContent->GetDocument() != GetDocument()) {
return nullptr;
}
nsIFrame *primaryFrame = aContent->GetPrimaryFrame();
if (!primaryFrame)
return nullptr;
return nsPlaceholderFrame::GetRealFrameFor(primaryFrame);
}
nsIFrame*
PresShell::GetPlaceholderFrameFor(nsIFrame* aFrame) const
{
return mFrameConstructor->GetPlaceholderFrameFor(aFrame);
}
nsresult
PresShell::RenderDocument(const nsRect& aRect, uint32_t aFlags,
nscolor aBackgroundColor,
gfxContext* aThebesContext)
{
NS_ENSURE_TRUE(!(aFlags & RENDER_IS_UNTRUSTED), NS_ERROR_NOT_IMPLEMENTED);
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext) {
rootPresContext->FlushWillPaintObservers();
if (mIsDestroying)
return NS_OK;
}
nsAutoScriptBlocker blockScripts;
// Set up the rectangle as the path in aThebesContext
gfxRect r(0, 0,
nsPresContext::AppUnitsToFloatCSSPixels(aRect.width),
nsPresContext::AppUnitsToFloatCSSPixels(aRect.height));
aThebesContext->NewPath();
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
aThebesContext->Rectangle(r, true);
#else
aThebesContext->Rectangle(r);
#endif
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
// Nothing to paint, just fill the rect
aThebesContext->SetColor(gfxRGBA(aBackgroundColor));
aThebesContext->Fill();
return NS_OK;
}
gfxContextAutoSaveRestore save(aThebesContext);
gfxContext::GraphicsOperator oldOperator = aThebesContext->CurrentOperator();
if (oldOperator == gfxContext::OPERATOR_OVER) {
// Clip to the destination rectangle before we push the group,
// to limit the size of the temporary surface
aThebesContext->Clip();
}
// we want the window to be composited as a single image using
// whatever operator was set; set OPERATOR_OVER here, which is
// either already the case, or overrides the operator in a group.
// the original operator will be present when we PopGroup.
// we can avoid using a temporary surface if we're using OPERATOR_OVER
bool needsGroup = oldOperator != gfxContext::OPERATOR_OVER;
if (needsGroup) {
aThebesContext->PushGroup(NS_GET_A(aBackgroundColor) == 0xff ?
GFX_CONTENT_COLOR :
GFX_CONTENT_COLOR_ALPHA);
aThebesContext->Save();
if (oldOperator != gfxContext::OPERATOR_OVER) {
// Clip now while we paint to the temporary surface. For
// non-source-bounded operators (e.g., SOURCE), we need to do clip
// here after we've pushed the group, so that eventually popping
// the group and painting it will be able to clear the entire
// destination surface.
aThebesContext->Clip();
aThebesContext->SetOperator(gfxContext::OPERATOR_OVER);
}
}
aThebesContext->Translate(gfxPoint(-nsPresContext::AppUnitsToFloatCSSPixels(aRect.x),
-nsPresContext::AppUnitsToFloatCSSPixels(aRect.y)));
nsDeviceContext* devCtx = mPresContext->DeviceContext();
gfxFloat scale = gfxFloat(devCtx->AppUnitsPerDevPixel())/nsPresContext::AppUnitsPerCSSPixel();
aThebesContext->Scale(scale, scale);
// Since canvas APIs use floats to set up their matrices, we may have
// some slight inaccuracy here. Adjust matrix components that are
// integers up to the accuracy of floats to be those integers.
aThebesContext->NudgeCurrentMatrixToIntegers();
AutoSaveRestoreRenderingState _(this);
nsRefPtr<nsRenderingContext> rc = new nsRenderingContext();
rc->Init(devCtx, aThebesContext);
bool wouldFlushRetainedLayers = false;
uint32_t flags = nsLayoutUtils::PAINT_IGNORE_SUPPRESSION;
if (aThebesContext->CurrentMatrix().HasNonIntegerTranslation()) {
flags |= nsLayoutUtils::PAINT_IN_TRANSFORM;
}
if (!(aFlags & RENDER_ASYNC_DECODE_IMAGES)) {
flags |= nsLayoutUtils::PAINT_SYNC_DECODE_IMAGES;
}
if (aFlags & RENDER_USE_WIDGET_LAYERS) {
// We only support using widget layers on display root's with widgets.
nsView* view = rootFrame->GetView();
if (view && view->GetWidget() &&
nsLayoutUtils::GetDisplayRootFrame(rootFrame) == rootFrame) {
flags |= nsLayoutUtils::PAINT_WIDGET_LAYERS;
}
}
if (!(aFlags & RENDER_CARET)) {
wouldFlushRetainedLayers = true;
flags |= nsLayoutUtils::PAINT_HIDE_CARET;
}
if (aFlags & RENDER_IGNORE_VIEWPORT_SCROLLING) {
wouldFlushRetainedLayers = !IgnoringViewportScrolling();
mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_IGNORING_VIEWPORT_SCROLLING);
}
if (aFlags & RENDER_DRAWWINDOW_NOT_FLUSHING) {
mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_DRAWWINDOW_NOT_FLUSHING);
}
if (aFlags & RENDER_DOCUMENT_RELATIVE) {
// XXX be smarter about this ... drawWindow might want a rect
// that's "pretty close" to what our retained layer tree covers.
// In that case, it wouldn't disturb normal rendering too much,
// and we should allow it.
wouldFlushRetainedLayers = true;
flags |= nsLayoutUtils::PAINT_DOCUMENT_RELATIVE;
}
// Don't let drawWindow blow away our retained layer tree
if ((flags & nsLayoutUtils::PAINT_WIDGET_LAYERS) && wouldFlushRetainedLayers) {
flags &= ~nsLayoutUtils::PAINT_WIDGET_LAYERS;
}
nsLayoutUtils::PaintFrame(rc, rootFrame, nsRegion(aRect),
aBackgroundColor, flags);
// if we had to use a group, paint it to the destination now
if (needsGroup) {
aThebesContext->Restore();
aThebesContext->PopGroupToSource();
aThebesContext->Paint();
}
return NS_OK;
}
/*
* Clip the display list aList to a range. Returns the clipped
* rectangle surrounding the range.
*/
nsRect
PresShell::ClipListToRange(nsDisplayListBuilder *aBuilder,
nsDisplayList* aList,
nsRange* aRange)
{
// iterate though the display items and add up the bounding boxes of each.
// This will allow the total area of the frames within the range to be
// determined. To do this, remove an item from the bottom of the list, check
// whether it should be part of the range, and if so, append it to the top
// of the temporary list tmpList. If the item is a text frame at the end of
// the selection range, clip it to the portion of the text frame that is
// part of the selection. Then, append the wrapper to the top of the list.
// Otherwise, just delete the item and don't append it.
nsRect surfaceRect;
nsDisplayList tmpList;
nsDisplayItem* i;
while ((i = aList->RemoveBottom())) {
// itemToInsert indiciates the item that should be inserted into the
// temporary list. If null, no item should be inserted.
nsDisplayItem* itemToInsert = nullptr;
nsIFrame* frame = i->Frame();
nsIContent* content = frame->GetContent();
if (content) {
bool atStart = (content == aRange->GetStartParent());
bool atEnd = (content == aRange->GetEndParent());
if ((atStart || atEnd) && frame->GetType() == nsGkAtoms::textFrame) {
int32_t frameStartOffset, frameEndOffset;
frame->GetOffsets(frameStartOffset, frameEndOffset);
int32_t hilightStart =
atStart ? std::max(aRange->StartOffset(), frameStartOffset) : frameStartOffset;
int32_t hilightEnd =
atEnd ? std::min(aRange->EndOffset(), frameEndOffset) : frameEndOffset;
if (hilightStart < hilightEnd) {
// determine the location of the start and end edges of the range.
nsPoint startPoint, endPoint;
frame->GetPointFromOffset(hilightStart, &startPoint);
frame->GetPointFromOffset(hilightEnd, &endPoint);
// the clip rectangle is determined by taking the the start and
// end points of the range, offset from the reference frame.
// Because of rtl, the end point may be to the left of the
// start point, so x is set to the lowest value
nsRect textRect(aBuilder->ToReferenceFrame(frame), frame->GetSize());
nscoord x = std::min(startPoint.x, endPoint.x);
textRect.x += x;
textRect.width = std::max(startPoint.x, endPoint.x) - x;
surfaceRect.UnionRect(surfaceRect, textRect);
DisplayItemClip newClip;
newClip.SetTo(textRect);
newClip.IntersectWith(i->GetClip());
i->SetClip(aBuilder, newClip);
itemToInsert = i;
}
}
// Don't try to descend into subdocuments.
// If this ever changes we'd need to add handling for subdocuments with
// different zoom levels.
else if (content->GetCurrentDoc() ==
aRange->GetStartParent()->GetCurrentDoc()) {
// if the node is within the range, append it to the temporary list
bool before, after;
nsresult rv =
nsRange::CompareNodeToRange(content, aRange, &before, &after);
if (NS_SUCCEEDED(rv) && !before && !after) {
itemToInsert = i;
bool snap;
surfaceRect.UnionRect(surfaceRect, i->GetBounds(aBuilder, &snap));
}
}
}
// insert the item into the list if necessary. If the item has a child
// list, insert that as well
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (itemToInsert || sublist) {
tmpList.AppendToTop(itemToInsert ? itemToInsert : i);
// if the item is a list, iterate over it as well
if (sublist)
surfaceRect.UnionRect(surfaceRect,
ClipListToRange(aBuilder, sublist, aRange));
}
else {
// otherwise, just delete the item and don't readd it to the list
i->~nsDisplayItem();
}
}
// now add all the items back onto the original list again
aList->AppendToTop(&tmpList);
return surfaceRect;
}
#ifdef DEBUG
#include <stdio.h>
static bool gDumpRangePaintList = false;
#endif
RangePaintInfo*
PresShell::CreateRangePaintInfo(nsIDOMRange* aRange,
nsRect& aSurfaceRect,
bool aForPrimarySelection)
{
RangePaintInfo* info = nullptr;
nsRange* range = static_cast<nsRange*>(aRange);
nsIFrame* ancestorFrame;
nsIFrame* rootFrame = GetRootFrame();
// If the start or end of the range is the document, just use the root
// frame, otherwise get the common ancestor of the two endpoints of the
// range.
nsINode* startParent = range->GetStartParent();
nsINode* endParent = range->GetEndParent();
nsIDocument* doc = startParent->GetCurrentDoc();
if (startParent == doc || endParent == doc) {
ancestorFrame = rootFrame;
}
else {
nsINode* ancestor = nsContentUtils::GetCommonAncestor(startParent, endParent);
NS_ASSERTION(!ancestor || ancestor->IsNodeOfType(nsINode::eCONTENT),
"common ancestor is not content");
if (!ancestor || !ancestor->IsNodeOfType(nsINode::eCONTENT))
return nullptr;
nsIContent* ancestorContent = static_cast<nsIContent*>(ancestor);
ancestorFrame = ancestorContent->GetPrimaryFrame();
// use the nearest ancestor frame that includes all continuations as the
// root for building the display list
while (ancestorFrame &&
nsLayoutUtils::GetNextContinuationOrSpecialSibling(ancestorFrame))
ancestorFrame = ancestorFrame->GetParent();
}
if (!ancestorFrame)
return nullptr;
info = new RangePaintInfo(range, ancestorFrame);
nsRect ancestorRect = ancestorFrame->GetVisualOverflowRect();
// get a display list containing the range
info->mBuilder.SetIncludeAllOutOfFlows();
if (aForPrimarySelection) {
info->mBuilder.SetSelectedFramesOnly();
}
info->mBuilder.EnterPresShell(ancestorFrame, ancestorRect);
ancestorFrame->BuildDisplayListForStackingContext(&info->mBuilder,
ancestorRect, &info->mList);
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- before ClipListToRange:\n");
nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
nsRect rangeRect = ClipListToRange(&info->mBuilder, &info->mList, range);
info->mBuilder.LeavePresShell(ancestorFrame, ancestorRect);
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- after ClipListToRange:\n");
nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
// determine the offset of the reference frame for the display list
// to the root frame. This will allow the coordinates used when painting
// to all be offset from the same point
info->mRootOffset = ancestorFrame->GetOffsetTo(rootFrame);
rangeRect.MoveBy(info->mRootOffset);
aSurfaceRect.UnionRect(aSurfaceRect, rangeRect);
return info;
}
already_AddRefed<gfxASurface>
PresShell::PaintRangePaintInfo(nsTArray<nsAutoPtr<RangePaintInfo> >* aItems,
nsISelection* aSelection,
nsIntRegion* aRegion,
nsRect aArea,
nsIntPoint& aPoint,
nsIntRect* aScreenRect)
{
nsPresContext* pc = GetPresContext();
if (!pc || aArea.width == 0 || aArea.height == 0)
return nullptr;
nsDeviceContext* deviceContext = pc->DeviceContext();
// use the rectangle to create the surface
nsIntRect pixelArea = aArea.ToOutsidePixels(pc->AppUnitsPerDevPixel());
// if the area of the image is larger than the maximum area, scale it down
float scale = 0.0;
nsIntRect rootScreenRect =
GetRootFrame()->GetScreenRectInAppUnits().ToNearestPixels(
pc->AppUnitsPerDevPixel());
// if the image is larger in one or both directions than half the size of
// the available screen area, scale the image down to that size.
nsRect maxSize;
deviceContext->GetClientRect(maxSize);
nscoord maxWidth = pc->AppUnitsToDevPixels(maxSize.width >> 1);
nscoord maxHeight = pc->AppUnitsToDevPixels(maxSize.height >> 1);
bool resize = (pixelArea.width > maxWidth || pixelArea.height > maxHeight);
if (resize) {
scale = 1.0;
// divide the maximum size by the image size in both directions. Whichever
// direction produces the smallest result determines how much should be
// scaled.
if (pixelArea.width > maxWidth)
scale = std::min(scale, float(maxWidth) / pixelArea.width);
if (pixelArea.height > maxHeight)
scale = std::min(scale, float(maxHeight) / pixelArea.height);
pixelArea.width = NSToIntFloor(float(pixelArea.width) * scale);
pixelArea.height = NSToIntFloor(float(pixelArea.height) * scale);
// adjust the screen position based on the rescaled size
nscoord left = rootScreenRect.x + pixelArea.x;
nscoord top = rootScreenRect.y + pixelArea.y;
aScreenRect->x = NSToIntFloor(aPoint.x - float(aPoint.x - left) * scale);
aScreenRect->y = NSToIntFloor(aPoint.y - float(aPoint.y - top) * scale);
}
else {
// move aScreenRect to the position of the surface in screen coordinates
aScreenRect->MoveTo(rootScreenRect.x + pixelArea.x, rootScreenRect.y + pixelArea.y);
}
aScreenRect->width = pixelArea.width;
aScreenRect->height = pixelArea.height;
nsRefPtr<gfxImageSurface> surface =
new gfxImageSurface(gfxIntSize(pixelArea.width, pixelArea.height),
gfxImageFormatARGB32);
if (surface->CairoStatus()) {
return nullptr;
}
// clear the image
gfxContext context(surface);
context.SetOperator(gfxContext::OPERATOR_CLEAR);
context.Rectangle(gfxRect(0, 0, pixelArea.width, pixelArea.height));
context.Fill();
nsRefPtr<nsRenderingContext> rc = new nsRenderingContext();
rc->Init(deviceContext, surface);
if (aRegion) {
// Convert aRegion from CSS pixels to dev pixels
nsIntRegion region =
aRegion->ToAppUnits(nsPresContext::AppUnitsPerCSSPixel())
.ToOutsidePixels(pc->AppUnitsPerDevPixel());
rc->SetClip(region);
}
if (resize)
rc->Scale(scale, scale);
// translate so that points are relative to the surface area
rc->Translate(-aArea.TopLeft());
// temporarily hide the selection so that text is drawn normally. If a
// selection is being rendered, use that, otherwise use the presshell's
// selection.
nsRefPtr<nsFrameSelection> frameSelection;
if (aSelection) {
frameSelection = static_cast<Selection*>(aSelection)->GetFrameSelection();
}
else {
frameSelection = FrameSelection();
}
int16_t oldDisplaySelection = frameSelection->GetDisplaySelection();
frameSelection->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
// next, paint each range in the selection
int32_t count = aItems->Length();
for (int32_t i = 0; i < count; i++) {
RangePaintInfo* rangeInfo = (*aItems)[i];
// the display lists paint relative to the offset from the reference
// frame, so translate the rendering context
nsRenderingContext::AutoPushTranslation
translate(rc, rangeInfo->mRootOffset);
aArea.MoveBy(-rangeInfo->mRootOffset.x, -rangeInfo->mRootOffset.y);
nsRegion visible(aArea);
rangeInfo->mList.ComputeVisibilityForRoot(&rangeInfo->mBuilder, &visible);
rangeInfo->mList.PaintRoot(&rangeInfo->mBuilder, rc, nsDisplayList::PAINT_DEFAULT);
aArea.MoveBy(rangeInfo->mRootOffset.x, rangeInfo->mRootOffset.y);
}
// restore the old selection display state
frameSelection->SetDisplaySelection(oldDisplaySelection);
return surface.forget();
}
already_AddRefed<gfxASurface>
PresShell::RenderNode(nsIDOMNode* aNode,
nsIntRegion* aRegion,
nsIntPoint& aPoint,
nsIntRect* aScreenRect)
{
// area will hold the size of the surface needed to draw the node, measured
// from the root frame.
nsRect area;
nsTArray<nsAutoPtr<RangePaintInfo> > rangeItems;
// nothing to draw if the node isn't in a document
nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
if (!node->IsInDoc())
return nullptr;
nsRefPtr<nsRange> range = new nsRange(node);
if (NS_FAILED(range->SelectNode(aNode)))
return nullptr;
RangePaintInfo* info = CreateRangePaintInfo(range, area, false);
if (info && !rangeItems.AppendElement(info)) {
delete info;
return nullptr;
}
if (aRegion) {
// combine the area with the supplied region
nsIntRect rrectPixels = aRegion->GetBounds();
nsRect rrect = rrectPixels.ToAppUnits(nsPresContext::AppUnitsPerCSSPixel());
area.IntersectRect(area, rrect);
nsPresContext* pc = GetPresContext();
if (!pc)
return nullptr;
// move the region so that it is offset from the topleft corner of the surface
aRegion->MoveBy(-pc->AppUnitsToDevPixels(area.x),
-pc->AppUnitsToDevPixels(area.y));
}
return PaintRangePaintInfo(&rangeItems, nullptr, aRegion, area, aPoint,
aScreenRect);
}
already_AddRefed<gfxASurface>
PresShell::RenderSelection(nsISelection* aSelection,
nsIntPoint& aPoint,
nsIntRect* aScreenRect)
{
// area will hold the size of the surface needed to draw the selection,
// measured from the root frame.
nsRect area;
nsTArray<nsAutoPtr<RangePaintInfo> > rangeItems;
// iterate over each range and collect them into the rangeItems array.
// This is done so that the size of selection can be determined so as
// to allocate a surface area
int32_t numRanges;
aSelection->GetRangeCount(&numRanges);
NS_ASSERTION(numRanges > 0, "RenderSelection called with no selection");
for (int32_t r = 0; r < numRanges; r++)
{
nsCOMPtr<nsIDOMRange> range;
aSelection->GetRangeAt(r, getter_AddRefs(range));
RangePaintInfo* info = CreateRangePaintInfo(range, area, true);
if (info && !rangeItems.AppendElement(info)) {
delete info;
return nullptr;
}
}
return PaintRangePaintInfo(&rangeItems, aSelection, nullptr, area, aPoint,
aScreenRect);
}
void
PresShell::AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds)
{
aList.AppendNewToBottom(new (&aBuilder)
nsDisplaySolidColor(&aBuilder, aFrame, aBounds, NS_RGB(115, 115, 115)));
}
static bool
AddCanvasBackgroundColor(const nsDisplayList& aList, nsIFrame* aCanvasFrame,
nscolor aColor)
{
for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) {
if (i->Frame() == aCanvasFrame &&
i->GetType() == nsDisplayItem::TYPE_CANVAS_BACKGROUND_COLOR) {
nsDisplayCanvasBackgroundColor* bg = static_cast<nsDisplayCanvasBackgroundColor*>(i);
bg->SetExtraBackgroundColor(aColor);
return true;
}
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (sublist && AddCanvasBackgroundColor(*sublist, aCanvasFrame, aColor))
return true;
}
return false;
}
void
PresShell::AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds,
nscolor aBackstopColor,
uint32_t aFlags)
{
if (aBounds.IsEmpty()) {
return;
}
// We don't want to add an item for the canvas background color if the frame
// (sub)tree we are painting doesn't include any canvas frames. There isn't
// an easy way to check this directly, but if we check if the root of the
// (sub)tree we are painting is a canvas frame that should cover us in all
// cases (it will usually be a viewport frame when we have a canvas frame in
// the (sub)tree).
if (!(aFlags & nsIPresShell::FORCE_DRAW) &&
!nsCSSRendering::IsCanvasFrame(aFrame)) {
return;
}
nscolor bgcolor = NS_ComposeColors(aBackstopColor, mCanvasBackgroundColor);
if (NS_GET_A(bgcolor) == 0)
return;
// To make layers work better, we want to avoid having a big non-scrolled
// color background behind a scrolled transparent background. Instead,
// we'll try to move the color background into the scrolled content
// by making nsDisplayCanvasBackground paint it.
if (!aFrame->GetParent()) {
nsIScrollableFrame* sf =
aFrame->PresContext()->PresShell()->GetRootScrollFrameAsScrollable();
if (sf) {
nsCanvasFrame* canvasFrame = do_QueryFrame(sf->GetScrolledFrame());
if (canvasFrame && canvasFrame->IsVisibleForPainting(&aBuilder)) {
if (AddCanvasBackgroundColor(aList, canvasFrame, bgcolor))
return;
}
}
}
aList.AppendNewToBottom(
new (&aBuilder) nsDisplaySolidColor(&aBuilder, aFrame, aBounds, bgcolor));
}
static bool IsTransparentContainerElement(nsPresContext* aPresContext)
{
nsCOMPtr<nsISupports> container = aPresContext->GetContainerInternal();
nsCOMPtr<nsIDocShellTreeItem> docShellItem = do_QueryInterface(container);
nsCOMPtr<nsPIDOMWindow> pwin(do_GetInterface(docShellItem));
if (!pwin)
return false;
nsCOMPtr<nsIContent> containerElement =
do_QueryInterface(pwin->GetFrameElementInternal());
return containerElement &&
containerElement->HasAttr(kNameSpaceID_None, nsGkAtoms::transparent);
}
nscolor PresShell::GetDefaultBackgroundColorToDraw()
{
if (!mPresContext || !mPresContext->GetBackgroundColorDraw()) {
return NS_RGB(255,255,255);
}
return mPresContext->DefaultBackgroundColor();
}
void PresShell::UpdateCanvasBackground()
{
// If we have a frame tree and it has style information that
// specifies the background color of the canvas, update our local
// cache of that color.
nsIFrame* rootStyleFrame = FrameConstructor()->GetRootElementStyleFrame();
if (rootStyleFrame) {
nsStyleContext* bgStyle =
nsCSSRendering::FindRootFrameBackground(rootStyleFrame);
// XXX We should really be passing the canvasframe, not the root element
// style frame but we don't have access to the canvasframe here. It isn't
// a problem because only a few frames can return something other than true
// and none of them would be a canvas frame or root element style frame.
bool drawBackgroundImage;
bool drawBackgroundColor;
mCanvasBackgroundColor =
nsCSSRendering::DetermineBackgroundColor(mPresContext, bgStyle,
rootStyleFrame,
drawBackgroundImage,
drawBackgroundColor);
if (GetPresContext()->IsCrossProcessRootContentDocument() &&
!IsTransparentContainerElement(mPresContext)) {
mCanvasBackgroundColor =
NS_ComposeColors(GetDefaultBackgroundColorToDraw(), mCanvasBackgroundColor);
}
}
// If the root element of the document (ie html) has style 'display: none'
// then the document's background color does not get drawn; cache the
// color we actually draw.
if (!FrameConstructor()->GetRootElementFrame()) {
mCanvasBackgroundColor = GetDefaultBackgroundColorToDraw();
}
if (XRE_GetProcessType() == GeckoProcessType_Content) {
if (TabChild* tabChild = TabChild::GetFrom(this)) {
tabChild->SetBackgroundColor(mCanvasBackgroundColor);
}
}
}
nscolor PresShell::ComputeBackstopColor(nsView* aDisplayRoot)
{
nsIWidget* widget = aDisplayRoot->GetWidget();
if (widget && (widget->GetTransparencyMode() != eTransparencyOpaque ||
widget->WidgetPaintsBackground())) {
// Within a transparent widget, so the backstop color must be
// totally transparent.
return NS_RGBA(0,0,0,0);
}
// Within an opaque widget (or no widget at all), so the backstop
// color must be totally opaque. The user's default background
// as reported by the prescontext is guaranteed to be opaque.
return GetDefaultBackgroundColorToDraw();
}
struct PaintParams {
nscolor mBackgroundColor;
};
LayerManager* PresShell::GetLayerManager()
{
NS_ASSERTION(mViewManager, "Should have view manager");
nsView* rootView = mViewManager->GetRootView();
if (rootView) {
if (nsIWidget* widget = rootView->GetWidget()) {
return widget->GetLayerManager();
}
}
return nullptr;
}
void PresShell::SetIgnoreViewportScrolling(bool aIgnore)
{
if (IgnoringViewportScrolling() == aIgnore) {
return;
}
RenderingState state(this);
state.mRenderFlags = ChangeFlag(state.mRenderFlags, aIgnore,
STATE_IGNORING_VIEWPORT_SCROLLING);
SetRenderingState(state);
}
void PresShell::SetDisplayPort(const nsRect& aDisplayPort)
{
NS_ABORT_IF_FALSE(false, "SetDisplayPort is deprecated");
}
nsresult PresShell::SetResolution(float aXResolution, float aYResolution)
{
if (!(aXResolution > 0.0 && aYResolution > 0.0)) {
return NS_ERROR_ILLEGAL_VALUE;
}
if (aXResolution == mXResolution && aYResolution == mYResolution) {
return NS_OK;
}
RenderingState state(this);
state.mXResolution = aXResolution;
state.mYResolution = aYResolution;
SetRenderingState(state);
return NS_OK;
}
void PresShell::SetRenderingState(const RenderingState& aState)
{
if (mRenderFlags != aState.mRenderFlags) {
// Rendering state changed in a way that forces us to flush any
// retained layers we might already have.
LayerManager* manager = GetLayerManager();
if (manager) {
FrameLayerBuilder::InvalidateAllLayers(manager);
}
}
mRenderFlags = aState.mRenderFlags;
mXResolution = aState.mXResolution;
mYResolution = aState.mYResolution;
}
void PresShell::SynthesizeMouseMove(bool aFromScroll)
{
if (!sSynthMouseMove)
return;
if (mPaintingSuppressed || !mIsActive || !mPresContext) {
return;
}
if (!mPresContext->IsRoot()) {
nsIPresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->SynthesizeMouseMove(aFromScroll);
}
return;
}
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE))
return;
if (!mSynthMouseMoveEvent.IsPending()) {
nsRefPtr<nsSynthMouseMoveEvent> ev =
new nsSynthMouseMoveEvent(this, aFromScroll);
if (!GetPresContext()->RefreshDriver()->AddRefreshObserver(ev,
Flush_Display)) {
NS_WARNING("failed to dispatch nsSynthMouseMoveEvent");
return;
}
mSynthMouseMoveEvent = ev;
}
}
/**
* Find the first floating view with a widget in a postorder traversal of the
* view tree that contains the point. Thus more deeply nested floating views
* are preferred over their ancestors, and floating views earlier in the
* view hierarchy (i.e., added later) are preferred over their siblings.
* This is adequate for finding the "topmost" floating view under a point,
* given that floating views don't supporting having a specific z-index.
*
* We cannot exit early when aPt is outside the view bounds, because floating
* views aren't necessarily included in their parent's bounds, so this could
* traverse the entire view hierarchy --- use carefully.
*/
static nsView* FindFloatingViewContaining(nsView* aView, nsPoint aPt)
{
if (aView->GetVisibility() == nsViewVisibility_kHide)
// No need to look into descendants.
return nullptr;
nsIFrame* frame = aView->GetFrame();
if (frame) {
if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
!frame->PresContext()->PresShell()->IsActive()) {
return nullptr;
}
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r = FindFloatingViewContaining(v, v->ConvertFromParentCoords(aPt));
if (r)
return r;
}
if (aView->GetFloating() && aView->HasWidget() &&
aView->GetDimensions().Contains(aPt))
return aView;
return nullptr;
}
/*
* This finds the first view containing the given point in a postorder
* traversal of the view tree that contains the point, assuming that the
* point is not in a floating view. It assumes that only floating views
* extend outside the bounds of their parents.
*
* This methods should only be called if FindFloatingViewContaining
* returns null.
*/
static nsView* FindViewContaining(nsView* aView, nsPoint aPt)
{
if (!aView->GetDimensions().Contains(aPt) ||
aView->GetVisibility() == nsViewVisibility_kHide) {
return nullptr;
}
nsIFrame* frame = aView->GetFrame();
if (frame) {
if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
!frame->PresContext()->PresShell()->IsActive()) {
return nullptr;
}
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r = FindViewContaining(v, v->ConvertFromParentCoords(aPt));
if (r)
return r;
}
return aView;
}
void
PresShell::ProcessSynthMouseMoveEvent(bool aFromScroll)
{
// If drag session has started, we shouldn't synthesize mousemove event.
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (dragSession) {
mSynthMouseMoveEvent.Forget();
return;
}
// allow new event to be posted while handling this one only if the
// source of the event is a scroll (to prevent infinite reflow loops)
if (aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
nsView* rootView = mViewManager ? mViewManager->GetRootView() : nullptr;
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) ||
!rootView || !rootView->HasWidget() || !mPresContext) {
mSynthMouseMoveEvent.Forget();
return;
}
NS_ASSERTION(mPresContext->IsRoot(), "Only a root pres shell should be here");
// Hold a ref to ourselves so DispatchEvent won't destroy us (since
// we need to access members after we call DispatchEvent).
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]synthesizing mouse move to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
int32_t APD = mPresContext->AppUnitsPerDevPixel();
// We need a widget to put in the event we are going to dispatch so we look
// for a view that has a widget and the mouse location is over. We first look
// for floating views, if there isn't one we use the root view. |view| holds
// that view.
nsView* view = nullptr;
// The appunits per devpixel ratio of |view|.
int32_t viewAPD;
// refPoint will be mMouseLocation relative to the widget of |view|, the
// widget we will put in the event we dispatch, in viewAPD appunits
nsPoint refpoint(0, 0);
// We always dispatch the event to the pres shell that contains the view that
// the mouse is over. pointVM is the VM of that pres shell.
nsViewManager *pointVM = nullptr;
// This could be a bit slow (traverses entire view hierarchy)
// but it's OK to do it once per synthetic mouse event
view = FindFloatingViewContaining(rootView, mMouseLocation);
if (!view) {
view = rootView;
nsView *pointView = FindViewContaining(rootView, mMouseLocation);
// pointView can be null in situations related to mouse capture
pointVM = (pointView ? pointView : view)->GetViewManager();
refpoint = mMouseLocation + rootView->ViewToWidgetOffset();
viewAPD = APD;
} else {
pointVM = view->GetViewManager();
nsIFrame* frame = view->GetFrame();
NS_ASSERTION(frame, "floating views can't be anonymous");
viewAPD = frame->PresContext()->AppUnitsPerDevPixel();
refpoint = mMouseLocation.ConvertAppUnits(APD, viewAPD);
refpoint -= view->GetOffsetTo(rootView);
refpoint += view->ViewToWidgetOffset();
}
NS_ASSERTION(view->GetWidget(), "view should have a widget here");
WidgetMouseEvent event(true, NS_MOUSE_MOVE, view->GetWidget(),
WidgetMouseEvent::eSynthesized);
event.refPoint = LayoutDeviceIntPoint::FromAppUnitsToNearest(refpoint, viewAPD);
event.time = PR_IntervalNow();
// XXX set event.modifiers ?
// XXX mnakano I think that we should get the latest information from widget.
nsCOMPtr<nsIPresShell> shell = pointVM->GetPresShell();
if (shell) {
shell->DispatchSynthMouseMove(&event, !aFromScroll);
}
if (!aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
}
/* static */ void
PresShell::MarkImagesInListVisible(const nsDisplayList& aList)
{
for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) {
nsDisplayList* sublist = item->GetChildren();
if (sublist) {
MarkImagesInListVisible(*sublist);
continue;
}
nsIFrame* f = item->Frame();
// We could check the type of the display item, only a handful can hold an
// image loading content.
// dont bother nscomptr here, it is wasteful
nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(f->GetContent()));
if (content) {
// use the presshell containing the image
PresShell* presShell = static_cast<PresShell*>(f->PresContext()->PresShell());
uint32_t count = presShell->mVisibleImages.Count();
presShell->mVisibleImages.PutEntry(content);
if (presShell->mVisibleImages.Count() > count) {
// content was added to mVisibleImages, so we need to increment its visible count
content->IncrementVisibleCount();
}
}
}
}
static PLDHashOperator
RemoveAndStore(nsRefPtrHashKey<nsIImageLoadingContent>* aEntry, void* userArg)
{
nsTArray< nsRefPtr<nsIImageLoadingContent> >* array =
static_cast< nsTArray< nsRefPtr<nsIImageLoadingContent> >* >(userArg);
array->AppendElement(aEntry->GetKey());
return PL_DHASH_REMOVE;
}
void
PresShell::RebuildImageVisibility(const nsDisplayList& aList)
{
MOZ_ASSERT(!mImageVisibilityVisited, "already visited?");
mImageVisibilityVisited = true;
// Remove the entries of the mVisibleImages hashtable and put them in the
// beforeImageList array.
nsTArray< nsRefPtr<nsIImageLoadingContent> > beforeImageList;
beforeImageList.SetCapacity(mVisibleImages.Count());
mVisibleImages.EnumerateEntries(RemoveAndStore, &beforeImageList);
MarkImagesInListVisible(aList);
for (uint32_t i = 0; i < beforeImageList.Length(); ++i) {
beforeImageList[i]->DecrementVisibleCount();
}
}
/* static */ void
PresShell::ClearImageVisibilityVisited(nsView* aView, bool aClear)
{
nsViewManager* vm = aView->GetViewManager();
if (aClear) {
PresShell* presShell = static_cast<PresShell*>(vm->GetPresShell());
if (!presShell->mImageVisibilityVisited) {
presShell->ClearVisibleImagesList();
}
presShell->mImageVisibilityVisited = false;
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
ClearImageVisibilityVisited(v, v->GetViewManager() != vm);
}
}
static PLDHashOperator
DecrementVisibleCount(nsRefPtrHashKey<nsIImageLoadingContent>* aEntry, void* userArg)
{
aEntry->GetKey()->DecrementVisibleCount();
return PL_DHASH_NEXT;
}
void
PresShell::ClearVisibleImagesList()
{
mVisibleImages.EnumerateEntries(DecrementVisibleCount, nullptr);
mVisibleImages.Clear();
}
void
PresShell::UpdateImageVisibility()
{
MOZ_ASSERT(!mPresContext || mPresContext->IsRootContentDocument(),
"updating image visibility on a non-root content document?");
mUpdateImageVisibilityEvent.Revoke();
if (mHaveShutDown || mIsDestroying) {
return;
}
// call update on that frame
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
ClearVisibleImagesList();
return;
}
// We could walk the frame tree directly and skip creating a display list for
// better perf.
nsRect updateRect(nsPoint(0, 0), rootFrame->GetSize());
nsDisplayListBuilder builder(rootFrame, nsDisplayListBuilder::IMAGE_VISIBILITY, true);
builder.IgnorePaintSuppression();
builder.EnterPresShell(rootFrame, updateRect);
nsDisplayList list;
rootFrame->BuildDisplayListForStackingContext(&builder, updateRect, &list);
builder.LeavePresShell(rootFrame, updateRect);
RebuildImageVisibility(list);
ClearImageVisibilityVisited(rootFrame->GetView(), true);
list.DeleteAll();
}
bool
PresShell::AssumeAllImagesVisible()
{
static bool sImageVisibilityEnabled = true;
static bool sImageVisibilityPrefCached = false;
if (!sImageVisibilityPrefCached) {
Preferences::AddBoolVarCache(&sImageVisibilityEnabled,
"layout.imagevisibility.enabled", true);
sImageVisibilityPrefCached = true;
}
if (!sImageVisibilityEnabled || !mPresContext || !mDocument)
return true;
// We assume all images are visible in print, print preview, chrome, xul, and
// resource docs and don't keep track of them.
if (mPresContext->Type() == nsPresContext::eContext_PrintPreview ||
mPresContext->Type() == nsPresContext::eContext_Print ||
mPresContext->IsChrome() ||
mDocument->IsResourceDoc() ||
mDocument->IsXUL()) {
return true;
}
return false;
}
void
PresShell::ScheduleImageVisibilityUpdate()
{
if (AssumeAllImagesVisible())
return;
if (!mPresContext->IsRootContentDocument()) {
nsPresContext* presContext = mPresContext->GetToplevelContentDocumentPresContext();
if (!presContext)
return;
MOZ_ASSERT(presContext->IsRootContentDocument(),
"Didn't get a root prescontext from GetToplevelContentDocumentPresContext?");
presContext->PresShell()->ScheduleImageVisibilityUpdate();
return;
}
if (mHaveShutDown || mIsDestroying)
return;
if (mUpdateImageVisibilityEvent.IsPending())
return;
nsRefPtr<nsRunnableMethod<PresShell> > ev =
NS_NewRunnableMethod(this, &PresShell::UpdateImageVisibility);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
mUpdateImageVisibilityEvent = ev;
}
}
void
PresShell::EnsureImageInVisibleList(nsIImageLoadingContent* aImage)
{
if (AssumeAllImagesVisible()) {
aImage->IncrementVisibleCount();
return;
}
#ifdef DEBUG
// if it has a frame make sure its in this presshell
nsCOMPtr<nsIContent> content = do_QueryInterface(aImage);
if (content) {
PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
MOZ_ASSERT(!shell || shell == this, "wrong shell");
}
#endif
if (!mVisibleImages.Contains(aImage)) {
mVisibleImages.PutEntry(aImage);
aImage->IncrementVisibleCount();
}
}
void
PresShell::RemoveImageFromVisibleList(nsIImageLoadingContent* aImage)
{
#ifdef DEBUG
// if it has a frame make sure its in this presshell
nsCOMPtr<nsIContent> content = do_QueryInterface(aImage);
if (content) {
PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
MOZ_ASSERT(!shell || shell == this, "wrong shell");
}
#endif
if (AssumeAllImagesVisible()) {
MOZ_ASSERT(mVisibleImages.Count() == 0, "shouldn't have any images in the table");
return;
}
uint32_t count = mVisibleImages.Count();
mVisibleImages.RemoveEntry(aImage);
if (mVisibleImages.Count() < count) {
// aImage was in the hashtable, so we need to decrement its visible count
aImage->DecrementVisibleCount();
}
}
class nsAutoNotifyDidPaint
{
public:
nsAutoNotifyDidPaint(PresShell* aShell, uint32_t aFlags)
: mShell(aShell), mFlags(aFlags)
{
}
~nsAutoNotifyDidPaint()
{
mShell->GetPresContext()->NotifyDidPaintForSubtree(mFlags);
}
private:
PresShell* mShell;
uint32_t mFlags;
};
class AutoUpdateHitRegion
{
public:
AutoUpdateHitRegion(PresShell* aShell, nsIFrame* aFrame)
: mShell(aShell), mFrame(aFrame)
{
}
~AutoUpdateHitRegion()
{
if (XRE_GetProcessType() != GeckoProcessType_Content ||
!mFrame || !mShell) {
return;
}
TabChild* tabChild = TabChild::GetFrom(mShell);
if (!tabChild || !tabChild->GetUpdateHitRegion()) {
return;
}
nsRegion region;
nsDisplayListBuilder builder(mFrame,
nsDisplayListBuilder::EVENT_DELIVERY,
/* aBuildCert= */ false);
nsDisplayList list;
nsAutoTArray<nsIFrame*, 100> outFrames;
nsDisplayItem::HitTestState hitTestState;
nsRect bounds = mShell->GetPresContext()->GetVisibleArea();
builder.EnterPresShell(mFrame, bounds);
mFrame->BuildDisplayListForStackingContext(&builder, bounds, &list);
builder.LeavePresShell(mFrame, bounds);
list.HitTest(&builder, bounds, &hitTestState, &outFrames);
list.DeleteAll();
for (int32_t i = outFrames.Length() - 1; i >= 0; --i) {
region.Or(region, nsLayoutUtils::TransformFrameRectToAncestor(
outFrames[i], nsRect(nsPoint(0, 0), outFrames[i]->GetSize()), mFrame));
}
tabChild->UpdateHitRegion(region);
}
private:
PresShell* mShell;
nsIFrame* mFrame;
};
void
PresShell::Paint(nsView* aViewToPaint,
const nsRegion& aDirtyRegion,
uint32_t aFlags)
{
PROFILER_LABEL("Paint", "PresShell::Paint");
NS_ASSERTION(!mIsDestroying, "painting a destroyed PresShell");
NS_ASSERTION(aViewToPaint, "null view");
MOZ_ASSERT(!mImageVisibilityVisited, "should have been cleared");
if (!mIsActive || mIsZombie) {
return;
}
nsPresContext* presContext = GetPresContext();
AUTO_LAYOUT_PHASE_ENTRY_POINT(presContext, Paint);
nsIFrame* frame = aViewToPaint->GetFrame();
bool isRetainingManager;
LayerManager* layerManager =
aViewToPaint->GetWidget()->GetLayerManager(&isRetainingManager);
NS_ASSERTION(layerManager, "Must be in paint event");
bool shouldInvalidate = layerManager->NeedsWidgetInvalidation();
uint32_t didPaintFlags = aFlags;
if (!shouldInvalidate) {
didPaintFlags |= PAINT_COMPOSITE;
}
nsAutoNotifyDidPaint notifyDidPaint(this, didPaintFlags);
AutoUpdateHitRegion updateHitRegion(this, frame);
// Whether or not we should set first paint when painting is
// suppressed is debatable. For now we'll do it because
// B2G relies on first paint to configure the viewport and
// we only want to do that when we have real content to paint.
// See Bug 798245
if (mIsFirstPaint && !mPaintingSuppressed) {
layerManager->SetIsFirstPaint();
mIsFirstPaint = false;
}
if (frame && isRetainingManager) {
// Try to do an empty transaction, if the frame tree does not
// need to be updated. Do not try to do an empty transaction on
// a non-retained layer manager (like the BasicLayerManager that
// draws the window title bar on Mac), because a) it won't work
// and b) below we don't want to clear NS_FRAME_UPDATE_LAYER_TREE,
// that will cause us to forget to update the real layer manager!
if (!(aFlags & PAINT_LAYERS)) {
layerManager->BeginTransaction();
if (layerManager->EndEmptyTransaction()) {
return;
}
NS_WARNING("Must complete empty transaction when compositing!");
} else {
layerManager->BeginTransaction();
}
if (!(frame->GetStateBits() & NS_FRAME_UPDATE_LAYER_TREE)) {
NotifySubDocInvalidationFunc computeInvalidFunc =
presContext->MayHavePaintEventListenerInSubDocument() ? nsPresContext::NotifySubDocInvalidation : 0;
bool computeInvalidRect = computeInvalidFunc ||
(layerManager->GetBackendType() == LAYERS_BASIC);
nsAutoPtr<LayerProperties> props(computeInvalidRect ?
LayerProperties::CloneFrom(layerManager->GetRoot()) :
nullptr);
if (layerManager->EndEmptyTransaction((aFlags & PAINT_COMPOSITE) ?
LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE)) {
nsIntRegion invalid;
if (props) {
invalid = props->ComputeDifferences(layerManager->GetRoot(), computeInvalidFunc);
} else {
LayerProperties::ClearInvalidations(layerManager->GetRoot());
}
if (props) {
if (!invalid.IsEmpty()) {
nsIntRect bounds = invalid.GetBounds();
nsRect rect(presContext->DevPixelsToAppUnits(bounds.x),
presContext->DevPixelsToAppUnits(bounds.y),
presContext->DevPixelsToAppUnits(bounds.width),
presContext->DevPixelsToAppUnits(bounds.height));
if (shouldInvalidate) {
aViewToPaint->GetViewManager()->InvalidateViewNoSuppression(aViewToPaint, rect);
}
presContext->NotifyInvalidation(bounds, 0);
}
} else if (shouldInvalidate) {
aViewToPaint->GetViewManager()->InvalidateView(aViewToPaint);
}
frame->UpdatePaintCountForPaintedPresShells();
return;
}
}
frame->RemoveStateBits(NS_FRAME_UPDATE_LAYER_TREE);
} else {
layerManager->BeginTransaction();
}
if (frame) {
frame->ClearPresShellsFromLastPaint();
}
nscolor bgcolor = ComputeBackstopColor(aViewToPaint);
uint32_t flags = nsLayoutUtils::PAINT_WIDGET_LAYERS | nsLayoutUtils::PAINT_EXISTING_TRANSACTION;
if (!(aFlags & PAINT_COMPOSITE)) {
flags |= nsLayoutUtils::PAINT_NO_COMPOSITE;
}
if (frame) {
// We can paint directly into the widget using its layer manager.
nsLayoutUtils::PaintFrame(nullptr, frame, aDirtyRegion, bgcolor, flags);
return;
}
nsRefPtr<ColorLayer> root = layerManager->CreateColorLayer();
if (root) {
nsPresContext* pc = GetPresContext();
nsIntRect bounds =
pc->GetVisibleArea().ToOutsidePixels(pc->AppUnitsPerDevPixel());
bgcolor = NS_ComposeColors(bgcolor, mCanvasBackgroundColor);
root->SetColor(bgcolor);
root->SetVisibleRegion(bounds);
layerManager->SetRoot(root);
}
layerManager->EndTransaction(nullptr, nullptr, (aFlags & PAINT_COMPOSITE) ?
LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE);
}
// static
void
nsIPresShell::SetCapturingContent(nsIContent* aContent, uint8_t aFlags)
{
// If capture was set for pointer lock, don't unlock unless we are coming
// out of pointer lock explicitly.
if (!aContent && gCaptureInfo.mPointerLock &&
!(aFlags & CAPTURE_POINTERLOCK)) {
return;
}
NS_IF_RELEASE(gCaptureInfo.mContent);
// only set capturing content if allowed or the CAPTURE_IGNOREALLOWED or
// CAPTURE_POINTERLOCK flags are used.
if ((aFlags & CAPTURE_IGNOREALLOWED) || gCaptureInfo.mAllowed ||
(aFlags & CAPTURE_POINTERLOCK)) {
if (aContent) {
NS_ADDREF(gCaptureInfo.mContent = aContent);
}
// CAPTURE_POINTERLOCK is the same as CAPTURE_RETARGETTOELEMENT & CAPTURE_IGNOREALLOWED
gCaptureInfo.mRetargetToElement = ((aFlags & CAPTURE_RETARGETTOELEMENT) != 0) ||
((aFlags & CAPTURE_POINTERLOCK) != 0);
gCaptureInfo.mPreventDrag = (aFlags & CAPTURE_PREVENTDRAG) != 0;
gCaptureInfo.mPointerLock = (aFlags & CAPTURE_POINTERLOCK) != 0;
}
}
nsIContent*
PresShell::GetCurrentEventContent()
{
if (mCurrentEventContent &&
mCurrentEventContent->GetCurrentDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
return mCurrentEventContent;
}
nsIFrame*
PresShell::GetCurrentEventFrame()
{
if (MOZ_UNLIKELY(mIsDestroying)) {
return nullptr;
}
// GetCurrentEventContent() makes sure the content is still in the
// same document that this pres shell belongs to. If not, then the
// frame shouldn't get an event, nor should we even assume its safe
// to try and find the frame.
nsIContent* content = GetCurrentEventContent();
if (!mCurrentEventFrame && content) {
mCurrentEventFrame = content->GetPrimaryFrame();
MOZ_ASSERT(!mCurrentEventFrame ||
mCurrentEventFrame->PresContext()->GetPresShell() == this);
}
return mCurrentEventFrame;
}
nsIFrame*
PresShell::GetEventTargetFrame()
{
return GetCurrentEventFrame();
}
already_AddRefed<nsIContent>
PresShell::GetEventTargetContent(WidgetEvent* aEvent)
{
nsCOMPtr<nsIContent> content = GetCurrentEventContent();
if (!content) {
nsIFrame* currentEventFrame = GetCurrentEventFrame();
if (currentEventFrame) {
currentEventFrame->GetContentForEvent(aEvent, getter_AddRefs(content));
NS_ASSERTION(!content || content->GetCurrentDoc() == mDocument,
"handing out content from a different doc");
}
}
return content.forget();
}
void
PresShell::PushCurrentEventInfo(nsIFrame* aFrame, nsIContent* aContent)
{
if (mCurrentEventFrame || mCurrentEventContent) {
mCurrentEventFrameStack.InsertElementAt(0, mCurrentEventFrame);
mCurrentEventContentStack.InsertObjectAt(mCurrentEventContent, 0);
}
mCurrentEventFrame = aFrame;
mCurrentEventContent = aContent;
}
void
PresShell::PopCurrentEventInfo()
{
mCurrentEventFrame = nullptr;
mCurrentEventContent = nullptr;
if (0 != mCurrentEventFrameStack.Length()) {
mCurrentEventFrame = mCurrentEventFrameStack.ElementAt(0);
mCurrentEventFrameStack.RemoveElementAt(0);
mCurrentEventContent = mCurrentEventContentStack.ObjectAt(0);
mCurrentEventContentStack.RemoveObjectAt(0);
// Don't use it if it has moved to a different document.
if (mCurrentEventContent &&
mCurrentEventContent->GetCurrentDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
}
}
bool PresShell::InZombieDocument(nsIContent *aContent)
{
// If a content node points to a null document, or the document is not
// attached to a window, then it is possibly in a zombie document,
// about to be replaced by a newly loading document.
// Such documents cannot handle DOM events.
// It might actually be in a node not attached to any document,
// in which case there is not parent presshell to retarget it to.
nsIDocument *doc = aContent->GetDocument();
return !doc || !doc->GetWindow();
}
already_AddRefed<nsPIDOMWindow>
PresShell::GetRootWindow()
{
nsCOMPtr<nsPIDOMWindow> window =
do_QueryInterface(mDocument->GetWindow());
if (window) {
nsCOMPtr<nsPIDOMWindow> rootWindow = window->GetPrivateRoot();
NS_ASSERTION(rootWindow, "nsPIDOMWindow::GetPrivateRoot() returns NULL");
return rootWindow.forget();
}
// If we don't have DOM window, we're zombie, we should find the root window
// with our parent shell.
nsCOMPtr<nsIPresShell> parent = GetParentPresShell();
NS_ENSURE_TRUE(parent, nullptr);
return parent->GetRootWindow();
}
already_AddRefed<nsIPresShell>
PresShell::GetParentPresShell()
{
NS_ENSURE_TRUE(mPresContext, nullptr);
nsCOMPtr<nsISupports> container = mPresContext->GetContainer();
if (!container) {
container = do_QueryReferent(mForwardingContainer);
}
// Now, find the parent pres shell and send the event there
nsCOMPtr<nsIDocShellTreeItem> treeItem = do_QueryInterface(container);
// Might have gone away, or never been around to start with
NS_ENSURE_TRUE(treeItem, nullptr);
nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
treeItem->GetParent(getter_AddRefs(parentTreeItem));
nsCOMPtr<nsIDocShell> parentDocShell = do_QueryInterface(parentTreeItem);
NS_ENSURE_TRUE(parentDocShell && treeItem != parentTreeItem, nullptr);
nsCOMPtr<nsIPresShell> parentPresShell = parentDocShell->GetPresShell();
return parentPresShell.forget();
}
nsresult
PresShell::RetargetEventToParent(WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
// Send this events straight up to the parent pres shell.
// We do this for keystroke events in zombie documents or if either a frame
// or a root content is not present.
// That way at least the UI key bindings can work.
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
nsCOMPtr<nsIPresShell> parentPresShell = GetParentPresShell();
NS_ENSURE_TRUE(parentPresShell, NS_ERROR_FAILURE);
// Fake the event as though it's from the parent pres shell's root frame.
return parentPresShell->HandleEvent(parentPresShell->GetRootFrame(), aEvent, true, aEventStatus);
}
void
PresShell::DisableNonTestMouseEvents(bool aDisable)
{
sDisableNonTestMouseEvents = aDisable;
}
already_AddRefed<nsPIDOMWindow>
PresShell::GetFocusedDOMWindowInOurWindow()
{
nsCOMPtr<nsPIDOMWindow> rootWindow = GetRootWindow();
NS_ENSURE_TRUE(rootWindow, nullptr);
nsCOMPtr<nsPIDOMWindow> focusedWindow;
nsFocusManager::GetFocusedDescendant(rootWindow, true,
getter_AddRefs(focusedWindow));
return focusedWindow.forget();
}
void
PresShell::RecordMouseLocation(WidgetGUIEvent* aEvent)
{
if (!mPresContext)
return;
if (!mPresContext->IsRoot()) {
PresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->RecordMouseLocation(aEvent);
}
return;
}
if ((aEvent->message == NS_MOUSE_MOVE &&
static_cast<WidgetMouseEvent*>(aEvent)->reason ==
WidgetMouseEvent::eReal) ||
aEvent->message == NS_MOUSE_ENTER ||
aEvent->message == NS_MOUSE_BUTTON_DOWN ||
aEvent->message == NS_MOUSE_BUTTON_UP) {
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
nsView* rootView = mViewManager->GetRootView();
mMouseLocation = nsLayoutUtils::TranslateWidgetToView(mPresContext,
aEvent->widget, LayoutDeviceIntPoint::ToUntyped(aEvent->refPoint),
rootView);
} else {
mMouseLocation =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, rootFrame);
}
#ifdef DEBUG_MOUSE_LOCATION
if (aEvent->message == NS_MOUSE_ENTER)
printf("[ps=%p]got mouse enter for %p\n",
this, aEvent->widget);
printf("[ps=%p]setting mouse location to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
if (aEvent->message == NS_MOUSE_ENTER)
SynthesizeMouseMove(false);
} else if (aEvent->message == NS_MOUSE_EXIT) {
// Although we only care about the mouse moving into an area for which this
// pres shell doesn't receive mouse move events, we don't check which widget
// the mouse exit was for since this seems to vary by platform. Hopefully
// this won't matter at all since we'll get the mouse move or enter after
// the mouse exit when the mouse moves from one of our widgets into another.
mMouseLocation = nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]got mouse exit for %p\n",
this, aEvent->widget);
printf("[ps=%p]clearing mouse location\n",
this);
#endif
}
}
static void
EvictTouchPoint(nsRefPtr<dom::Touch>& aTouch)
{
nsIWidget *widget = nullptr;
// is there an easier/better way to dig out the widget?
nsCOMPtr<nsINode> node(do_QueryInterface(aTouch->mTarget));
if (!node) {
return;
}
nsIDocument* doc = node->GetCurrentDoc();
if (!doc) {
return;
}
nsIPresShell *presShell = doc->GetShell();
if (!presShell) {
return;
}
nsIFrame* frame = presShell->GetRootFrame();
if (!frame) {
return;
}
nsPoint pt(aTouch->mRefPoint.x, aTouch->mRefPoint.y);
widget = frame->GetView()->GetNearestWidget(&pt);
if (!widget) {
return;
}
WidgetTouchEvent event(true, NS_TOUCH_END, widget);
event.widget = widget;
event.time = PR_IntervalNow();
event.touches.AppendElement(aTouch);
nsEventStatus status;
widget->DispatchEvent(&event, status);
}
static PLDHashOperator
AppendToTouchList(const uint32_t& aKey, nsRefPtr<dom::Touch>& aData, void *aTouchList)
{
nsTArray< nsRefPtr<dom::Touch> >* touches =
static_cast<nsTArray< nsRefPtr<dom::Touch> >*>(aTouchList);
aData->mChanged = false;
touches->AppendElement(aData);
return PL_DHASH_NEXT;
}
static PLDHashOperator
FindAnyTarget(const uint32_t& aKey, nsRefPtr<dom::Touch>& aData,
void* aAnyTarget)
{
if (aData) {
dom::EventTarget* target = aData->Target();
if (target) {
nsCOMPtr<nsIContent>* content =
static_cast<nsCOMPtr<nsIContent>*>(aAnyTarget);
*content = do_QueryInterface(target);
return PL_DHASH_STOP;
}
}
return PL_DHASH_NEXT;
}
nsIFrame* GetNearestFrameContainingPresShell(nsIPresShell* aPresShell)
{
nsView* view = aPresShell->GetViewManager()->GetRootView();
while (view && !view->GetFrame()) {
view = view->GetParent();
}
nsIFrame* frame = nullptr;
if (view) {
frame = view->GetFrame();
}
return frame;
}
nsresult
PresShell::HandleEvent(nsIFrame* aFrame,
WidgetGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus)
{
NS_ASSERTION(aFrame, "null frame");
if (mIsDestroying ||
(sDisableNonTestMouseEvents && !aEvent->mFlags.mIsSynthesizedForTests &&
aEvent->HasMouseEventMessage())) {
return NS_OK;
}
RecordMouseLocation(aEvent);
if (!nsContentUtils::IsSafeToRunScript())
return NS_OK;
nsIContent* capturingContent =
(aEvent->HasMouseEventMessage() ||
aEvent->eventStructType == NS_WHEEL_EVENT ? GetCapturingContent() :
nullptr);
nsCOMPtr<nsIDocument> retargetEventDoc;
if (!aDontRetargetEvents) {
// key and IME related events should not cross top level window boundary.
// Basically, such input events should be fired only on focused widget.
// However, some IMEs might need to clean up composition after focused
// window is deactivated. And also some tests on MozMill want to test key
// handling on deactivated window because MozMill window can be activated
// during tests. So, there is no merit the events should be redirected to
// active window. So, the events should be handled on the last focused
// content in the last focused DOM window in same top level window.
// Note, if no DOM window has been focused yet, we can discard the events.
if (aEvent->IsTargetedAtFocusedWindow()) {
nsCOMPtr<nsPIDOMWindow> window = GetFocusedDOMWindowInOurWindow();
// No DOM window in same top level window has not been focused yet,
// discard the events.
if (!window) {
return NS_OK;
}
retargetEventDoc = window->GetExtantDoc();
if (!retargetEventDoc)
return NS_OK;
} else if (capturingContent) {
// if the mouse is being captured then retarget the mouse event at the
// document that is being captured.
retargetEventDoc = capturingContent->GetCurrentDoc();
#ifdef ANDROID
} else if (aEvent->eventStructType == NS_TOUCH_EVENT) {
retargetEventDoc = GetTouchEventTargetDocument();
#endif
}
if (retargetEventDoc) {
nsCOMPtr<nsIPresShell> presShell = retargetEventDoc->GetShell();
if (!presShell)
return NS_OK;
if (presShell != this) {
nsIFrame* frame = presShell->GetRootFrame();
if (!frame) {
if (aEvent->message == NS_QUERY_TEXT_CONTENT ||
aEvent->IsContentCommandEvent()) {
return NS_OK;
}
frame = GetNearestFrameContainingPresShell(presShell);
}
if (!frame)
return NS_OK;
nsCOMPtr<nsIPresShell> shell = frame->PresContext()->GetPresShell();
return shell->HandleEvent(frame, aEvent, true, aEventStatus);
}
}
}
if (aEvent->eventStructType == NS_KEY_EVENT &&
mDocument && mDocument->EventHandlingSuppressed()) {
if (aEvent->message == NS_KEY_DOWN) {
mNoDelayedKeyEvents = true;
} else if (!mNoDelayedKeyEvents) {
nsDelayedEvent* event =
new nsDelayedKeyEvent(static_cast<WidgetKeyboardEvent*>(aEvent));
if (!mDelayedEvents.AppendElement(event)) {
delete event;
}
}
return NS_OK;
}
nsIFrame* frame = aFrame;
if (aEvent->eventStructType == NS_TOUCH_EVENT) {
nsIDocument::UnlockPointer();
FlushPendingNotifications(Flush_Layout);
frame = GetNearestFrameContainingPresShell(this);
}
bool dispatchUsingCoordinates = aEvent->IsUsingCoordinates();
if (dispatchUsingCoordinates) {
NS_WARN_IF_FALSE(frame, "Nothing to handle this event!");
if (!frame)
return NS_OK;
nsPresContext* framePresContext = frame->PresContext();
nsPresContext* rootPresContext = framePresContext->GetRootPresContext();
NS_ASSERTION(rootPresContext == mPresContext->GetRootPresContext(),
"How did we end up outside the connected prescontext/viewmanager hierarchy?");
// If we aren't starting our event dispatch from the root frame of the root prescontext,
// then someone must be capturing the mouse. In that case we don't want to search the popup
// list.
if (framePresContext == rootPresContext &&
frame == mFrameConstructor->GetRootFrame()) {
nsIFrame* popupFrame =
nsLayoutUtils::GetPopupFrameForEventCoordinates(rootPresContext, aEvent);
// If the popupFrame is an ancestor of the 'frame', the frame should
// handle the event, otherwise, the popup should handle it.
if (popupFrame &&
!nsContentUtils::ContentIsCrossDocDescendantOf(
framePresContext->GetPresShell()->GetDocument(),
popupFrame->GetContent())) {
frame = popupFrame;
}
}
bool captureRetarget = false;
if (capturingContent) {
// If a capture is active, determine if the docshell is visible. If not,
// clear the capture and target the mouse event normally instead. This
// would occur if the mouse button is held down while a tab change occurs.
// If the docshell is visible, look for a scrolling container.
bool vis;
nsCOMPtr<nsISupports> supports = mPresContext->GetContainer();
nsCOMPtr<nsIBaseWindow> baseWin(do_QueryInterface(supports));
if (baseWin && NS_SUCCEEDED(baseWin->GetVisibility(&vis)) && vis) {
captureRetarget = gCaptureInfo.mRetargetToElement;
if (!captureRetarget) {
// A check was already done above to ensure that capturingContent is
// in this presshell.
NS_ASSERTION(capturingContent->GetCurrentDoc() == GetDocument(),
"Unexpected document");
nsIFrame* captureFrame = capturingContent->GetPrimaryFrame();
if (captureFrame) {
if (capturingContent->Tag() == nsGkAtoms::select &&
capturingContent->IsHTML()) {
// a dropdown <select> has a child in its selectPopupList and we should
// capture on that instead.
nsIFrame* childFrame = captureFrame->GetChildList(nsIFrame::kSelectPopupList).FirstChild();
if (childFrame) {
captureFrame = childFrame;
}
}
// scrollable frames should use the scrolling container as
// the root instead of the document
nsIScrollableFrame* scrollFrame = do_QueryFrame(captureFrame);
if (scrollFrame) {
frame = scrollFrame->GetScrolledFrame();
}
}
}
}
else {
ClearMouseCapture(nullptr);
capturingContent = nullptr;
}
}
// all touch events except for touchstart use a captured target
if (aEvent->eventStructType == NS_TOUCH_EVENT &&
aEvent->message != NS_TOUCH_START) {
captureRetarget = true;
}
bool isWindowLevelMouseExit = (aEvent->message == NS_MOUSE_EXIT) &&
(static_cast<WidgetMouseEvent*>(aEvent)->exit ==
WidgetMouseEvent::eTopLevel);
// Get the frame at the event point. However, don't do this if we're
// capturing and retargeting the event because the captured frame will
// be used instead below. Also keep using the root frame if we're dealing
// with a window-level mouse exit event since we want to start sending
// mouse out events at the root EventStateManager.
if (!captureRetarget && !isWindowLevelMouseExit) {
nsPoint eventPoint;
uint32_t flags = 0;
if (aEvent->message == NS_TOUCH_START) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// if this is a continuing session, ensure that all these events are
// in the same document by taking the target of the events already in
// the capture list
nsCOMPtr<nsIContent> anyTarget;
if (gCaptureTouchList->Count() > 0) {
gCaptureTouchList->Enumerate(&FindAnyTarget, &anyTarget);
} else {
gPreventMouseEvents = false;
}
for (int32_t i = touchEvent->touches.Length(); i; ) {
--i;
dom::Touch* touch = touchEvent->touches[i];
int32_t id = touch->Identifier();
if (!gCaptureTouchList->Get(id, nullptr)) {
// find the target for this touch
eventPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
touch->mRefPoint,
frame);
nsIFrame* target = FindFrameTargetedByInputEvent(aEvent,
frame,
eventPoint,
flags);
if (target && !anyTarget) {
target->GetContentForEvent(aEvent, getter_AddRefs(anyTarget));
while (anyTarget && !anyTarget->IsElement()) {
anyTarget = anyTarget->GetParent();
}
touch->SetTarget(anyTarget);
} else {
nsIFrame* newTargetFrame = nullptr;
for (nsIFrame* f = target; f;
f = nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(f)) {
if (f->PresContext()->Document() == anyTarget->OwnerDoc()) {
newTargetFrame = f;
break;
}
// We must be in a subdocument so jump directly to the root frame.
// GetParentOrPlaceholderForCrossDoc gets called immediately to
// jump up to the containing document.
f = f->PresContext()->GetPresShell()->GetRootFrame();
}
// if we couldn't find a target frame in the same document as
// anyTarget, remove the touch from the capture touch list, as
// well as the event->touches array. touchmove events that aren't
// in the captured touch list will be discarded
if (!newTargetFrame) {
touchEvent->touches.RemoveElementAt(i);
} else {
target = newTargetFrame;
nsCOMPtr<nsIContent> targetContent;
target->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
while (targetContent && !targetContent->IsElement()) {
targetContent = targetContent->GetParent();
}
touch->SetTarget(targetContent);
}
}
if (target) {
frame = target;
}
} else {
// This touch is an old touch, we need to ensure that is not
// marked as changed and set its target correctly
touch->mChanged = false;
int32_t id = touch->Identifier();
nsRefPtr<dom::Touch> oldTouch = gCaptureTouchList->GetWeak(id);
if (oldTouch) {
touch->SetTarget(oldTouch->mTarget);
}
}
}
} else {
eventPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, frame);
}
if (aEvent->eventStructType == NS_MOUSE_EVENT &&
static_cast<WidgetMouseEvent*>(aEvent)->ignoreRootScrollFrame) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
}
nsIFrame* target =
FindFrameTargetedByInputEvent(aEvent, frame, eventPoint, flags);
if (target) {
frame = target;
}
}
// if a node is capturing the mouse, check if the event needs to be
// retargeted at the capturing content instead. This will be the case when
// capture retargeting is being used, no frame was found or the frame's
// content is not a descendant of the capturing content.
if (capturingContent &&
(gCaptureInfo.mRetargetToElement || !frame->GetContent() ||
!nsContentUtils::ContentIsCrossDocDescendantOf(frame->GetContent(),
capturingContent))) {
// A check was already done above to ensure that capturingContent is
// in this presshell.
NS_ASSERTION(capturingContent->GetCurrentDoc() == GetDocument(),
"Unexpected document");
nsIFrame* capturingFrame = capturingContent->GetPrimaryFrame();
if (capturingFrame) {
frame = capturingFrame;
}
}
// Suppress mouse event if it's being targeted at an element inside
// a document which needs events suppressed
if (aEvent->eventStructType == NS_MOUSE_EVENT &&
frame->PresContext()->Document()->EventHandlingSuppressed()) {
if (aEvent->message == NS_MOUSE_BUTTON_DOWN) {
mNoDelayedMouseEvents = true;
} else if (!mNoDelayedMouseEvents && aEvent->message == NS_MOUSE_BUTTON_UP) {
nsDelayedEvent* event =
new nsDelayedMouseEvent(static_cast<WidgetMouseEvent*>(aEvent));
if (!mDelayedEvents.AppendElement(event)) {
delete event;
}
}
return NS_OK;
}
PresShell* shell =
static_cast<PresShell*>(frame->PresContext()->PresShell());
switch (aEvent->message) {
case NS_TOUCH_MOVE:
case NS_TOUCH_CANCEL:
case NS_TOUCH_END: {
// get the correct shell to dispatch to
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
nsTArray< nsRefPtr<dom::Touch> >& touches = touchEvent->touches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
dom::Touch* touch = touches[i];
if (!touch) {
break 