/* -*- 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/Logging.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/CSSStyleSheet.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/InitializerList.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/Likely.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Snprintf.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/unused.h"
#include <algorithm>
#ifdef XP_WIN
#include "winuser.h"
#endif
#include "gfxPrefs.h"
#include "gfxUserFontSet.h"
#include "nsPresShell.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsIContentIterator.h"
#include "mozilla/dom/BeforeAfterKeyboardEvent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h" // for Event::GetEventPopupControlState()
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/PointerEvent.h"
#include "nsIDocument.h"
#include "nsAnimationManager.h"
#include "nsNameSpaceManager.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 "prprf.h"
#include "prinrval.h"
#include "nsTArray.h"
#include "nsCOMArray.h"
#include "nsContainerFrame.h"
#include "nsISelection.h"
#include "mozilla/dom/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 "nsIPermissionManager.h"
#include "nsIMozBrowserFrame.h"
#include "nsCaret.h"
#include "AccessibleCaretEventHub.h"
#include "nsIDOMHTMLDocument.h"
#include "nsFrameManager.h"
#include "nsXPCOM.h"
#include "nsILayoutHistoryState.h"
#include "nsILineIterator.h" // for ScrollContentIntoView
#include "PLDHashTable.h"
#include "mozilla/dom/BeforeAfterKeyboardEventBinding.h"
#include "mozilla/dom/Touch.h"
#include "mozilla/dom/PointerEventBinding.h"
#include "nsIObserverService.h"
#include "nsDocShell.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 "nsThreadUtils.h"
#include "nsStyleSheetService.h"
#include "gfxContext.h"
#include "gfxUtils.h"
#include "nsSMILAnimationController.h"
#include "SVGContentUtils.h"
#include "nsSVGEffects.h"
#include "SVGFragmentIdentifier.h"
#include "nsArenaMemoryStats.h"
#include "nsFrameSelection.h"
#include "mozilla/dom/Performance.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 "mozilla/layers/CompositorBridgeChild.h"
#include "GeckoProfiler.h"
#include "gfxPlatform.h"
#include "Layers.h"
#include "LayerTreeInvalidation.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/dom/DocumentTimeline.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "nsCanvasFrame.h"
#include "nsIImageLoadingContent.h"
#include "nsImageFrame.h"
#include "nsIScreen.h"
#include "nsIScreenManager.h"
#include "nsPlaceholderFrame.h"
#include "nsTransitionManager.h"
#include "ChildIterator.h"
#include "mozilla/RestyleManagerHandle.h"
#include "mozilla/RestyleManagerHandleInlines.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDragSession.h"
#include "nsIFrameInlines.h"
#include "mozilla/gfx/2D.h"
#include "nsSubDocumentFrame.h"
#include "nsQueryObject.h"
#include "nsLayoutStylesheetCache.h"
#include "mozilla/layers/InputAPZContext.h"
#include "mozilla/layers/ScrollInputMethods.h"
#include "nsStyleSet.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "mozilla/StyleSheetHandle.h"
#include "mozilla/StyleSheetHandleInlines.h"
#ifdef ANDROID
#include "nsIDocShellTreeOwner.h"
#endif
#ifdef MOZ_B2G
#include "nsIHardwareKeyHandler.h"
#endif
#ifdef MOZ_TASK_TRACER
#include "GeckoTaskTracer.h"
using namespace mozilla::tasktracer;
#endif
#define ANCHOR_SCROLL_FLAGS \
(nsIPresShell::SCROLL_OVERFLOW_HIDDEN | nsIPresShell::SCROLL_NO_PARENT_FRAMES)
// define the scalfactor of drag and drop images
// relative to the max screen height/width
#define RELATIVE_SCALEFACTOR 0.0925f
using std::initializer_list;
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::gfx;
using namespace mozilla::layout;
using PaintFrameFlags = nsLayoutUtils::PaintFrameFlags;
CapturingContentInfo nsIPresShell::gCaptureInfo =
{ false /* mAllowed */, false /* mPointerLock */, false /* mRetargetToElement */,
false /* mPreventDrag */ };
nsIContent* nsIPresShell::gKeyDownTarget;
nsClassHashtable<nsUint32HashKey, nsIPresShell::PointerCaptureInfo>* nsIPresShell::gPointerCaptureList;
nsClassHashtable<nsUint32HashKey, nsIPresShell::PointerInfo>* nsIPresShell::gActivePointersIds;
// RangePaintInfo is used to paint ranges to offscreen buffers
struct RangePaintInfo {
RefPtr<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, nsDisplayListBuilderMode::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:
explicit 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:
explicit 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();
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:
explicit 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 EventDispatchingCallback
{
public:
explicit nsPresShellEventCB(PresShell* aPresShell) : mPresShell(aPresShell) {}
virtual void HandleEvent(EventChainPostVisitor& aVisitor) override
{
if (aVisitor.mPresContext && aVisitor.mEvent->mClass != eBasicEventClass) {
if (aVisitor.mEvent->mMessage == eMouseDown ||
aVisitor.mEvent->mMessage == eMouseUp) {
// 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->mMessage == eWheel &&
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.
RefPtr<EventStateManager> esm =
aVisitor.mPresContext->EventStateManager();
esm->DispatchLegacyMouseScrollEvents(frame,
aVisitor.mEvent->AsWheelEvent(),
&aVisitor.mEventStatus);
}
}
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (!frame &&
(aVisitor.mEvent->mMessage == eMouseUp ||
aVisitor.mEvent->mMessage == eTouchEnd)) {
// 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,
aVisitor.mEvent->AsGUIEvent(),
&aVisitor.mEventStatus);
}
}
}
RefPtr<PresShell> mPresShell;
};
class nsBeforeFirstPaintDispatcher : public Runnable
{
public:
explicit 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() override
{
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;
mozilla::LazyLogModule PresShell::gLog("PresShell");
#ifdef DEBUG
static void
VerifyStyleTree(nsPresContext* aPresContext, nsFrameManager* aFrameManager)
{
if (nsFrame::GetVerifyStyleTreeEnable()) {
if (aPresContext->RestyleManager()->IsServo()) {
NS_ERROR("stylo: cannot verify style tree with a ServoRestyleManager");
return;
}
nsIFrame* rootFrame = aFrameManager->GetRootFrame();
aPresContext->RestyleManager()->AsGecko()->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::CancelInvalidatePresShellIfHidden()
{
if (mHiddenInvalidationObserverRefreshDriver) {
mHiddenInvalidationObserverRefreshDriver->RemovePresShellToInvalidateIfHidden(this);
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()
{
RefPtr<nsFrameSelection> ret = mSelection;
return ret.forget();
}
//----------------------------------------------------------------------
static bool sSynthMouseMove = true;
static uint32_t sNextPresShellId;
static bool sPointerEventEnabled = true;
static bool sAccessibleCaretEnabled = false;
static bool sBeforeAfterKeyboardEventEnabled = false;
/* static */ bool
PresShell::AccessibleCaretEnabled()
{
static bool initialized = false;
if (!initialized) {
Preferences::AddBoolVarCache(&sAccessibleCaretEnabled, "layout.accessiblecaret.enabled");
initialized = true;
}
return sAccessibleCaretEnabled;
}
/* static */ bool
PresShell::BeforeAfterKeyboardEventEnabled()
{
static bool sInitialized = false;
if (!sInitialized) {
Preferences::AddBoolVarCache(&sBeforeAfterKeyboardEventEnabled,
"dom.beforeAfterKeyboardEvent.enabled");
sInitialized = true;
}
return sBeforeAfterKeyboardEventEnabled;
}
/* static */ bool
PresShell::IsTargetIframe(nsINode* aTarget)
{
return aTarget && aTarget->IsHTMLElement(nsGkAtoms::iframe);
}
PresShell::PresShell()
: mMouseLocation(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)
{
#ifdef MOZ_REFLOW_PERF
mReflowCountMgr = new ReflowCountMgr();
mReflowCountMgr->SetPresContext(mPresContext);
mReflowCountMgr->SetPresShell(this);
#endif
mLoadBegin = TimeStamp::Now();
mSelectionFlags = nsISelectionDisplay::DISPLAY_TEXT | nsISelectionDisplay::DISPLAY_IMAGES;
mIsThemeSupportDisabled = false;
mIsActive = true;
mIsHidden = false;
// FIXME/bug 735029: find a better solution to this problem
#if defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_ANDROID_APZ)
// 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;
mRenderFlags = 0;
mScrollPositionClampingScrollPortSizeSet = false;
static bool addedSynthMouseMove = false;
if (!addedSynthMouseMove) {
Preferences::AddBoolVarCache(&sSynthMouseMove,
"layout.reflow.synthMouseMove", true);
addedSynthMouseMove = true;
}
static bool addedPointerEventEnabled = false;
if (!addedPointerEventEnabled) {
Preferences::AddBoolVarCache(&sPointerEventEnabled,
"dom.w3c_pointer_events.enabled", true);
addedPointerEventEnabled = true;
}
mPaintingIsFrozen = false;
mHasCSSBackgroundColor = true;
mIsLastChromeOnlyEscapeKeyConsumed = false;
mHasReceivedPaintMessage = false;
}
NS_IMPL_ISUPPORTS(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");
// Verify that if painting was frozen, but we're being removed from the tree,
// that we now re-enable painting on our refresh driver, since it may need to
// be re-used by another presentation.
if (mPaintingIsFrozen) {
mPresContext->RefreshDriver()->Thaw();
}
MOZ_ASSERT(mAllocatedPointers.IsEmpty(), "Some pres arena objects were not freed");
mStyleSet->Delete();
delete mFrameConstructor;
mCurrentEventContent = nullptr;
}
/**
* 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,
StyleSetHandle aStyleSet)
{
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;
mViewManager = aViewManager;
// Create our frame constructor.
mFrameConstructor = new nsCSSFrameConstructor(mDocument, this);
mFrameManager = mFrameConstructor;
// The document viewer owns both view manager and pres shell.
mViewManager->SetPresShell(this);
// Bind the context to the presentation shell.
mPresContext = aPresContext;
aPresContext->SetShell(this);
// Now we can initialize the style set. Make sure to set the member before
// calling Init, since various subroutines need to find the style set off
// the PresContext during initialization.
mStyleSet = aStyleSet;
mStyleSet->Init(aPresContext);
// 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();
// Add the preference style sheet.
UpdatePreferenceStyles();
if (AccessibleCaretEnabled()) {
// Need to happen before nsFrameSelection has been set up.
mAccessibleCaretEventHub = new AccessibleCaretEventHub(this);
}
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
os->AddObserver(this, "memory-pressure", false);
}
}
#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());
}
mDocument->Timeline()->NotifyRefreshDriverCreated(GetPresContext()->
RefreshDriver());
// Get our activeness from the docShell.
QueryIsActive();
// Setup our font inflation preferences.
SetupFontInflation();
mTouchManager.Init(this, mDocument);
if (mPresContext->IsRootContentDocument()) {
mZoomConstraintsClient = new ZoomConstraintsClient();
mZoomConstraintsClient->Init(this, mDocument);
if (gfxPrefs::MetaViewportEnabled() || gfxPrefs::APZAllowZooming()) {
mMobileViewportManager = new MobileViewportManager(this, mDocument);
}
}
}
enum TextPerfLogType {
eLog_reflow,
eLog_loaddone,
eLog_totals
};
static void
LogTextPerfStats(gfxTextPerfMetrics* aTextPerf,
PresShell* aPresShell,
const gfxTextPerfMetrics::TextCounts& aCounts,
float aTime, TextPerfLogType aLogType, const char* aURL)
{
LogModule* tpLog = gfxPlatform::GetLog(eGfxLog_textperf);
// ignore XUL contexts unless at debug level
mozilla::LogLevel logLevel = LogLevel::Warning;
if (aCounts.numContentTextRuns == 0) {
logLevel = LogLevel::Debug;
}
if (!MOZ_LOG_TEST(tpLog, logLevel)) {
return;
}
char prefix[256];
switch (aLogType) {
case eLog_reflow:
snprintf_literal(prefix, "(textperf-reflow) %p time-ms: %7.0f", aPresShell, aTime);
break;
case eLog_loaddone:
snprintf_literal(prefix, "(textperf-loaddone) %p time-ms: %7.0f", aPresShell, aTime);
break;
default:
MOZ_ASSERT(aLogType == eLog_totals, "unknown textperf log type");
snprintf_literal(prefix, "(textperf-totals) %p", aPresShell);
}
double hitRatio = 0.0;
uint32_t lookups = aCounts.wordCacheHit + aCounts.wordCacheMiss;
if (lookups) {
hitRatio = double(aCounts.wordCacheHit) / double(lookups);
}
if (aLogType == eLog_loaddone) {
MOZ_LOG(tpLog, logLevel,
("%s reflow: %d chars: %d "
"[%s] "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
(aURL ? aURL : ""),
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen,
lookups, hitRatio,
aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr,
aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
} else {
MOZ_LOG(tpLog, logLevel,
("%s reflow: %d chars: %d "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen,
lookups, hitRatio,
aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr,
aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
}
}
void
PresShell::Destroy()
{
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"destroy called on presshell while scripts not blocked");
// dump out cumulative text perf metrics
gfxTextPerfMetrics* tp;
if (mPresContext && (tp = mPresContext->GetTextPerfMetrics())) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, 0.0, eLog_totals, nullptr);
}
}
if (mPresContext) {
gfxUserFontSet* fs = mPresContext->GetUserFontSet();
if (fs) {
uint32_t fontCount;
uint64_t fontSize;
fs->GetLoadStatistics(fontCount, fontSize);
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, fontCount);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE,
uint32_t(fontSize/1024));
} else {
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, 0);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE, 0);
}
}
#ifdef MOZ_REFLOW_PERF
DumpReflows();
if (mReflowCountMgr) {
delete mReflowCountMgr;
mReflowCountMgr = nullptr;
}
#endif
if (mHaveShutDown)
return;
if (mZoomConstraintsClient) {
mZoomConstraintsClient->Destroy();
mZoomConstraintsClient = nullptr;
}
if (mMobileViewportManager) {
mMobileViewportManager->Destroy();
mMobileViewportManager = nullptr;
}
#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
os->RemoveObserver(this, "memory-pressure");
}
}
// 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;
}
if (mDelayedPaintTimer) {
mDelayedPaintTimer->Cancel();
mDelayedPaintTimer = nullptr;
}
mSynthMouseMoveEvent.Revoke();
mUpdateApproximateFrameVisibilityEvent.Revoke();
mNotifyCompositorOfVisibleRegionsChangeEvent.Revoke();
ClearVisibleFramesSets(Some(OnNonvisible::DISCARD_IMAGES));
if (mCaret) {
mCaret->Terminate();
mCaret = nullptr;
}
if (mSelection) {
mSelection->DisconnectFromPresShell();
}
if (mAccessibleCaretEventHub) {
mAccessibleCaretEventHub->Terminate();
mAccessibleCaretEventHub = nullptr;
}
// release our pref style sheet, if we have one still
RemovePreferenceStyles();
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;
}
// mFrameArena will be destroyed soon. Clear out any ArenaRefPtrs
// pointing to objects in the arena now. This is done:
//
// (a) before mFrameArena's destructor runs so that our
// mAllocatedPointers becomes empty and doesn't trip the assertion
// in ~PresShell,
// (b) before the mPresContext->SetShell(nullptr) below, so
// that when we clear the ArenaRefPtrs they'll still be able to
// get back to this PresShell to deregister themselves (e.g. note
// how nsStyleContext::Arena returns the PresShell got from its
// rule node's nsPresContext, which would return null if we'd already
// called mPresContext->SetShell(nullptr)), and
// (c) before the mStyleSet->BeginShutdown() call just below, so that
// the nsStyleContexts don't complain they're being destroyed later
// than the rule tree is.
mFrameArena.ClearArenaRefPtrs();
mStyleSet->BeginShutdown();
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);
}
mDocument->Timeline()->NotifyRefreshDriverDestroying(rd);
}
if (mPresContext) {
mPresContext->AnimationManager()->ClearEventQueue();
mPresContext->TransitionManager()->ClearEventQueue();
}
// 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();
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;
mTouchManager.Destroy();
}
void
PresShell::MakeZombie()
{
mIsZombie = true;
CancelAllPendingReflows();
}
nsRefreshDriver*
nsIPresShell::GetRefreshDriver() const
{
return mPresContext ? mPresContext->RefreshDriver() : nullptr;
}
void
nsIPresShell::SetAuthorStyleDisabled(bool aStyleDisabled)
{
if (aStyleDisabled != mStyleSet->GetAuthorStyleDisabled()) {
mStyleSet->SetAuthorStyleDisabled(aStyleDisabled);
RestyleForCSSRuleChanges();
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(mDocument,
"author-style-disabled-changed",
nullptr);
}
}
}
bool
nsIPresShell::GetAuthorStyleDisabled() const
{
return mStyleSet->GetAuthorStyleDisabled();
}
void
PresShell::UpdatePreferenceStyles()
{
if (!mDocument) {
return;
}
// 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 (!mDocument->GetWindow()) {
return;
}
// Documents in chrome shells do not have any preference style rules applied.
if (nsContentUtils::IsInChromeDocshell(mDocument)) {
return;
}
// We need to pass in mPresContext so that if the nsLayoutStylesheetCache
// needs to recreate the pref style sheet, it has somewhere to get the
// pref styling information from. All pres contexts for
// IsChromeOriginImage() == false will have the same pref styling information,
// and similarly for IsChromeOriginImage() == true, so it doesn't really
// matter which pres context we pass in when it does need to be recreated.
// (See nsPresContext::GetDocumentColorPreferences for how whether we
// are a chrome origin image affects some pref styling information.)
auto cache = nsLayoutStylesheetCache::For(mStyleSet->BackendType());
StyleSheetHandle::RefPtr newPrefSheet =
mPresContext->IsChromeOriginImage() ?
cache->ChromePreferenceSheet(mPresContext) :
cache->ContentPreferenceSheet(mPresContext);
if (mPrefStyleSheet == newPrefSheet) {
return;
}
mStyleSet->BeginUpdate();
RemovePreferenceStyles();
mStyleSet->AppendStyleSheet(SheetType::User, newPrefSheet);
mPrefStyleSheet = newPrefSheet;
mStyleSet->EndUpdate();
}
void
PresShell::RemovePreferenceStyles()
{
if (mPrefStyleSheet) {
mStyleSet->RemoveStyleSheet(SheetType::User, mPrefStyleSheet);
mPrefStyleSheet = nullptr;
}
}
void
PresShell::AddUserSheet(nsISupports* aSheet)
{
if (mStyleSet->IsServo()) {
NS_ERROR("stylo: nsStyleSheetService doesn't handle ServoStyleSheets yet");
return;
}
// 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;
nsTArray<StyleSheetHandle::RefPtr>& userSheets = *sheetService->UserStyleSheets();
// Iterate forwards when removing so the searches for RemoveStyleSheet are as
// short as possible.
for (StyleSheetHandle sheet : userSheets) {
mStyleSet->RemoveStyleSheet(SheetType::User, sheet);
}
// 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 (StyleSheetHandle sheet : Reversed(userSheets)) {
mStyleSet->PrependStyleSheet(SheetType::User, sheet);
}
mStyleSet->EndUpdate();
RestyleForCSSRuleChanges();
}
void
PresShell::AddAgentSheet(nsISupports* aSheet)
{
// Make sure this does what nsDocumentViewer::CreateStyleSet does
// wrt ordering.
// XXXheycam This needs to work with ServoStyleSheets too.
RefPtr<CSSStyleSheet> sheet = do_QueryObject(aSheet);
if (!sheet) {
NS_ERROR("stylo: AddAgentSheet needs to support ServoStyleSheets");
return;
}
mStyleSet->AppendStyleSheet(SheetType::Agent, sheet);
RestyleForCSSRuleChanges();
}
void
PresShell::AddAuthorSheet(nsISupports* aSheet)
{
// XXXheycam This needs to work with ServoStyleSheets too.
RefPtr<CSSStyleSheet> sheet = do_QueryObject(aSheet);
if (!sheet) {
NS_ERROR("stylo: AddAuthorSheet needs to support ServoStyleSheets");
return;
}
// Document specific "additional" Author sheets should be stronger than the
// ones added with the StyleSheetService.
StyleSheetHandle firstAuthorSheet =
mDocument->GetFirstAdditionalAuthorSheet();
if (firstAuthorSheet) {
mStyleSet->InsertStyleSheetBefore(SheetType::Doc, sheet, firstAuthorSheet);
} else {
mStyleSet->AppendStyleSheet(SheetType::Doc, sheet);
}
RestyleForCSSRuleChanges();
}
void
PresShell::RemoveSheet(SheetType aType, nsISupports* aSheet)
{
RefPtr<CSSStyleSheet> sheet = do_QueryObject(aSheet);
if (!sheet) {
NS_ERROR("stylo: RemoveSheet needs to support ServoStyleSheets");
return;
}
mStyleSet->RemoveStyleSheet(aType, sheet);
RestyleForCSSRuleChanges();
}
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(RawSelectionType aRawSelectionType,
nsISelection **aSelection)
{
if (!aSelection || !mSelection)
return NS_ERROR_NULL_POINTER;
*aSelection = mSelection->GetSelection(ToSelectionType(aRawSelectionType));
if (!(*aSelection))
return NS_ERROR_INVALID_ARG;
NS_ADDREF(*aSelection);
return NS_OK;
}
Selection*
PresShell::GetCurrentSelection(SelectionType aSelectionType)
{
if (!mSelection)
return nullptr;
return mSelection->GetSelection(aSelectionType);
}
already_AddRefed<nsISelectionController>
PresShell::GetSelectionControllerForFocusedContent(nsIContent** aFocusedContent)
{
if (aFocusedContent) {
*aFocusedContent = nullptr;
}
if (mDocument) {
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
nsCOMPtr<nsIContent> focusedContent =
nsFocusManager::GetFocusedDescendant(mDocument->GetWindow(), false,
getter_AddRefs(focusedWindow));
if (focusedContent) {
nsIFrame* frame = focusedContent->GetPrimaryFrame();
if (frame) {
nsCOMPtr<nsISelectionController> selectionController;
frame->GetSelectionController(mPresContext,
getter_AddRefs(selectionController));
if (selectionController) {
if (aFocusedContent) {
focusedContent.forget(aFocusedContent);
}
return selectionController.forget();
}
}
}
}
nsCOMPtr<nsISelectionController> self(this);
return self.forget();
}
NS_IMETHODIMP
PresShell::ScrollSelectionIntoView(RawSelectionType aRawSelectionType,
SelectionRegion aRegion,
int16_t aFlags)
{
if (!mSelection)
return NS_ERROR_NULL_POINTER;
return mSelection->ScrollSelectionIntoView(ToSelectionType(aRawSelectionType),
aRegion, aFlags);
}
NS_IMETHODIMP
PresShell::RepaintSelection(RawSelectionType aRawSelectionType)
{
if (!mSelection)
return NS_ERROR_NULL_POINTER;
return mSelection->RepaintSelection(ToSelectionType(aRawSelectionType));
}
// 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;
}
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
// 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;
}
nsIFrame* invalidateFrame = nullptr;
for (nsIFrame* f = rootFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
if (f->GetStateBits() & NS_FRAME_NO_COMPONENT_ALPHA) {
invalidateFrame = f;
f->RemoveStateBits(NS_FRAME_NO_COMPONENT_ALPHA);
}
nsCOMPtr<nsIPresShell> shell;
if (f->GetType() == nsGkAtoms::subDocumentFrame &&
(shell = static_cast<nsSubDocumentFrame*>(f)->GetSubdocumentPresShellForPainting(0)) &&
shell->GetPresContext()->IsRootContentDocument()) {
// Root content documents build a 'force active' layer, and component alpha flattening
// can't be propagated across that so no need to invalidate above this frame.
break;
}
}
if (invalidateFrame) {
invalidateFrame->InvalidateFrameSubtree();
}
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;
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, nsIPresShell::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->InitWithNamedFuncCallback(
sPaintSuppressionCallback, this, delay, nsITimer::TYPE_ONE_SHOT,
"PresShell::sPaintSuppressionCallback");
}
}
// If we get here and painting is not suppressed, then we can paint anytime
// and we should fire the before-first-paint notification
if (!mPaintingSuppressed) {
ScheduleBeforeFirstPaint();
}
return NS_OK; //XXX this needs to be real. MMP
}
void
PresShell::sPaintSuppressionCallback(nsITimer *aTimer, void* aPresShell)
{
RefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
if (self)
self->UnsuppressPainting();
}
void
PresShell::AsyncResizeEventCallback(nsITimer* aTimer, void* aPresShell)
{
static_cast<PresShell*>(aPresShell)->FireResizeEvent();
}
nsresult
PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight, nscoord aOldWidth, nscoord aOldHeight)
{
if (mZoomConstraintsClient) {
// If we have a ZoomConstraintsClient and the available screen area
// changed, then we might need to disable double-tap-to-zoom, so notify
// the ZCC to update itself.
mZoomConstraintsClient->ScreenSizeChanged();
}
if (mMobileViewportManager) {
// If we have a mobile viewport manager, request a reflow from it. It can
// recompute the final CSS viewport and trigger a call to
// ResizeReflowIgnoreOverride if it changed.
mMobileViewportManager->RequestReflow();
return NS_OK;
}
return ResizeReflowIgnoreOverride(aWidth, aHeight, aOldWidth, aOldHeight);
}
nsresult
PresShell::ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight, nscoord aOldWidth, nscoord aOldHeight)
{
NS_PRECONDITION(!mIsReflowing, "Shouldn't be in reflow here!");
// 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;
}
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
// There isn't anything useful we can do if the initial reflow hasn't happened.
if (!rootFrame) {
return NS_OK;
}
WritingMode wm = rootFrame->GetWritingMode();
NS_PRECONDITION((wm.IsVertical() ? aHeight : aWidth) != NS_UNCONSTRAINEDSIZE,
"shouldn't use unconstrained isize anymore");
const bool isBSizeChanging = wm.IsVertical()
? aOldWidth != aWidth
: aOldHeight != aHeight;
RefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
// Take this ref after viewManager so it'll make sure to go away first.
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
if (!GetPresContext()->SuppressingResizeReflow()) {
// 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;
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?
if (isBSizeChanging) {
// For BSize changes driven by style, RestyleManager handles this.
// For height:auto BSizes (i.e. layout-controlled), descendant
// intrinsic sizes can't depend on them. So the only other case is
// viewport-controlled BSizes which we handle here.
nsLayoutUtils::MarkIntrinsicISizesDirtyIfDependentOnBSize(rootFrame);
}
{
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);
}
}
rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
wm = rootFrame->GetWritingMode();
if (wm.IsVertical()) {
if (aWidth == NS_UNCONSTRAINEDSIZE) {
mPresContext->SetVisibleArea(
nsRect(0, 0, rootFrame->GetRect().width, aHeight));
}
} else {
if (aHeight == NS_UNCONSTRAINEDSIZE) {
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 {
RefPtr<nsRunnableMethod<PresShell> > resizeEvent =
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::FireResizeEvent()
{
if (mAsyncResizeTimerIsActive) {
mAsyncResizeTimerIsActive = false;
mAsyncResizeEventTimer->Cancel();
}
mResizeEvent.Revoke();
if (mIsDocumentGone)
return;
//Send resize event from here.
WidgetEvent event(true, mozilla::eResize);
nsEventStatus status = nsEventStatus_eIgnore;
if (nsPIDOMWindowOuter* window = mDocument->GetWindow()) {
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
mInResize = true;
EventDispatcher::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(mPresContext);
}
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
{
RefPtr<nsCaret> caret = mCaret;
return caret.forget();
}
already_AddRefed<AccessibleCaretEventHub> PresShell::GetAccessibleCaretEventHub() const
{
RefPtr<AccessibleCaretEventHub> eventHub = mAccessibleCaretEventHub;
return eventHub.forget();
}
void PresShell::SetCaret(nsCaret *aNewCaret)
{
mCaret = aNewCaret;
}
void PresShell::RestoreCaret()
{
mCaret = mOriginalCaret;
}
NS_IMETHODIMP PresShell::SetCaretEnabled(bool aInEnable)
{
bool oldEnabled = mCaretEnabled;
mCaretEnabled = aInEnable;
if (mCaretEnabled != oldEnabled)
{
MOZ_ASSERT(mCaret);
if (mCaret) {
mCaret->SetVisible(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) {
*aOutIsVisible = mCaret->IsVisible();
}
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::PhysicalMove(int16_t aDirection, int16_t aAmount, bool aExtend)
{
return mSelection->PhysicalMove(aDirection, aAmount, aExtend);
}
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 |
nsISelectionController::SCROLL_FOR_CARET_MOVE);
}
NS_IMETHODIMP
PresShell::ScrollPage(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
(uint32_t) ScrollInputMethod::MainThreadScrollPage);
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::PAGES,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollLine(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
(uint32_t) ScrollInputMethod::MainThreadScrollLine);
int32_t lineCount = Preferences::GetInt("toolkit.scrollbox.verticalScrollDistance",
NS_DEFAULT_VERTICAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? lineCount : -lineCount),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollCharacter(bool aRight)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eHorizontal);
if (scrollFrame) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
(uint32_t) ScrollInputMethod::MainThreadScrollCharacter);
int32_t h = Preferences::GetInt("toolkit.scrollbox.horizontalScrollDistance",
NS_DEFAULT_HORIZONTAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(aRight ? h : -h, 0),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteScroll(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
(uint32_t) ScrollInputMethod::MainThreadCompleteScroll);
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::WHOLE,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
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 ? CARET_ASSOCIATE_AFTER : CARET_ASSOCIATE_BEFORE);
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 |
nsISelectionController::SCROLL_FOR_CARET_MOVE);
}
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->PrincipalChildList().FirstChild();
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);
}
nsCanvasFrame*
PresShell::GetCanvasFrame() const
{
nsIFrame* frame = mFrameConstructor->GetDocElementContainingBlock();
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())
RestyleForCSSRuleChanges();
}
mFrameConstructor->EndUpdate();
}
void
PresShell::RestoreRootScrollPosition()
{
nsIScrollableFrame* scrollableFrame = GetRootScrollFrameAsScrollable();
if (scrollableFrame) {
scrollableFrame->ScrollToRestoredPosition();
}
}
void
PresShell::MaybeReleaseCapturingContent()
{
RefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (frameSelection) {
frameSelection->SetDragState(false);
}
if (gCaptureInfo.mContent &&
gCaptureInfo.mContent->OwnerDoc() == mDocument) {
SetCapturingContent(nullptr, 0);
}
}
void
PresShell::BeginLoad(nsIDocument *aDocument)
{
mDocumentLoading = true;
gfxTextPerfMetrics *tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
bool shouldLog = MOZ_LOG_TEST(gLog, LogLevel::Debug);
if (shouldLog || tp) {
mLoadBegin = TimeStamp::Now();
}
if (shouldLog) {
nsIURI* uri = mDocument->GetDocumentURI();
nsAutoCString spec;
if (uri) {
uri->GetSpec(spec);
}
MOZ_LOG(gLog, LogLevel::Debug,
("(presshell) %p load begin [%s]\n",
this, spec.get()));
}
}
void
PresShell::EndLoad(nsIDocument *aDocument)
{
NS_PRECONDITION(aDocument == mDocument, "Wrong document");
RestoreRootScrollPosition();
mDocumentLoading = false;
}
void
PresShell::LoadComplete()
{
gfxTextPerfMetrics *tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
// log load
bool shouldLog = MOZ_LOG_TEST(gLog, LogLevel::Debug);
if (shouldLog || tp) {
TimeDuration loadTime = TimeStamp::Now() - mLoadBegin;
nsIURI* uri = mDocument->GetDocumentURI();
nsAutoCString spec;
if (uri) {
uri->GetSpec(spec);
}
if (shouldLog) {
MOZ_LOG(gLog, LogLevel::Debug,
("(presshell) %p load done time-ms: %9.2f [%s]\n",
this, loadTime.ToMilliseconds(), spec.get()));
}
if (tp) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, loadTime.ToMilliseconds(),
eLog_loaddone, spec.get());
}
}
}
}
#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,
ReflowRootHandling aRootHandling)
{
NS_PRECONDITION(aBitToAdd == NS_FRAME_IS_DIRTY ||
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN ||
!aBitToAdd,
"Unexpected bits being added");
NS_PRECONDITION(!(aIntrinsicDirty == eStyleChange &&
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN),
"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
AutoTArray<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);
// Determine whether we need to keep looking for the next ancestor
// reflow root if subtreeRoot itself is a reflow root.
bool targetNeedsReflowFromParent;
switch (aRootHandling) {
case ePositionOrSizeChange:
targetNeedsReflowFromParent = true;
break;
case eNoPositionOrSizeChange:
targetNeedsReflowFromParent = false;
break;
case eInferFromBitToAdd:
targetNeedsReflowFromParent = (aBitToAdd == NS_FRAME_IS_DIRTY);
break;
}
#define FRAME_IS_REFLOW_ROOT(_f) \
((_f->GetStateBits() & NS_FRAME_REFLOW_ROOT) && \
(_f != subtreeRoot || !targetNeedsReflowFromParent))
// Mark the intrinsic widths as dirty on the frame, all of its ancestors,
// and all of its descendants, if needed:
if (aIntrinsicDirty != nsIPresShell::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->MarkIntrinsicISizesDirty();
}
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.
AutoTArray<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()) {
for (nsIFrame* kid : lists.CurrentList()) {
kid->MarkIntrinsicISizesDirty();
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
}
// Skip setting dirty bits up the tree if we weren't given a bit to add.
if (!aBitToAdd) {
continue;
}
// 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<nsIDOMElement> focusedElement;
fm->GetFocusedElementForWindow(mDocument->GetWindow(), false, nullptr,
getter_AddRefs(focusedElement));
focusedContent = do_QueryInterface(focusedElement);
}
if (!focusedContent && mSelection) {
nsISelection* domSelection =
mSelection->GetSelection(SelectionType::eNormal);
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();
}
void
PresShell::DestroyFramesFor(nsIContent* aContent,
nsIContent** aDestroyedFramesFor)
{
MOZ_ASSERT(aContent);
NS_ENSURE_TRUE_VOID(mPresContext);
if (!mDidInitialize) {
return;
}
nsAutoScriptBlocker scriptBlocker;
// Mark ourselves as not safe to flush while we're doing frame destruction.
++mChangeNestCount;
nsCSSFrameConstructor* fc = FrameConstructor();
fc->BeginUpdate();
fc->DestroyFramesFor(aContent, aDestroyedFramesFor);
fc->EndUpdate();
--mChangeNestCount;
}
void
PresShell::CreateFramesFor(nsIContent* aContent)
{
NS_ENSURE_TRUE_VOID(mPresContext);
if (!mDidInitialize) {
// Nothing to do here. In fact, if we proceed and aContent is the
// root we will crash.
return;
}
// 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");
MOZ_ASSERT(aContent);
// 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;
// Mark ourselves as not safe to flush while we're doing frame construction.
++mChangeNestCount;
nsCSSFrameConstructor* fc = FrameConstructor();
nsILayoutHistoryState* layoutState = fc->GetLastCapturedLayoutHistoryState();
fc->BeginUpdate();
fc->ContentInserted(aContent->GetParent(), aContent, layoutState, false);
fc->EndUpdate();
--mChangeNestCount;
}
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;
RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
if (restyleManager->IsServo()) {
MOZ_CRASH("stylo: PresShell::RecreateFramesFor not implemented for Servo-"
"backed style system");
}
nsresult rv = restyleManager->AsGecko()->ProcessRestyledFrames(changeList);
restyleManager->AsGecko()->FlushOverflowChangedTracker();
--mChangeNestCount;
return rv;
}
void
nsIPresShell::PostRecreateFramesFor(Element* aElement)
{
mPresContext->RestyleManager()->PostRestyleEvent(aElement, nsRestyleHint(0),
nsChangeHint_ReconstructFrame);
}
void
nsIPresShell::RestyleForAnimation(Element* aElement, nsRestyleHint aHint)
{
// Now that we no longer have separate non-animation and animation
// restyles, this method having a distinct identity is less important,
// but it still seems useful to offer as a "more public" API and as a
// chokepoint for these restyles to go through.
mPresContext->RestyleManager()->PostRestyleEvent(aElement, aHint,
NS_STYLE_HINT_NONE);
}
void
nsIPresShell::SetForwardingContainer(const WeakPtr<nsDocShell> &aContainer)
{
mForwardingContainer = aContainer;
}
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<gfxContext>
PresShell::CreateReferenceRenderingContext()
{
nsDeviceContext* devCtx = mPresContext->DeviceContext();
RefPtr<gfxContext> rc;
if (mPresContext->IsScreen()) {
rc = gfxContext::CreateOrNull(gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget());
} else {
// We assume the devCtx has positive width and height for this call.
// However, width and height, may be outside of the reasonable range
// so rc may still be null.
rc = devCtx->CreateRenderingContext();
}
return rc ? rc.forget() : nullptr;
}
nsresult
PresShell::GoToAnchor(const nsAString& aAnchorName, bool aScroll,
uint32_t aAdditionalScrollFlags)
{
if (!mDocument) {
return NS_ERROR_FAILURE;
}
const Element *root = mDocument->GetRootElement();
if (root && root->IsSVGElement(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.
RefPtr<EventStateManager> 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->IsHTMLElement(nsGkAtoms::a)) {
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 | aAdditionalScrollFlags);
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
RefPtr<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(SelectionType::eNormal);
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.
nsPIDOMWindowOuter *win = mDocument->GetWindow();
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && win) {
nsCOMPtr<mozIDOMWindowProxy> 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->IsAbsPosContaininingBlock()) {
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;
if (NS_SUCCEEDED(aLines->GetLine(index, &trash1, &trash2,
lineBounds))) {
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(nsIScrollableFrame* aFrameAsScrollable,
const nsRect& aRect,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
nsPoint scrollPt = aFrameAsScrollable->GetScrollPosition();
nsRect visibleRect(scrollPt,
aFrameAsScrollable->GetScrollPositionClampingScrollPortSize());
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,
aRect.y,
aRect.YMost(),
visibleRect.y,
visibleRect.YMost())) {
nscoord maxHeight;
scrollPt.y = ComputeWhereToScroll(aVertical.mWhereToScroll,
scrollPt.y,
aRect.y,
aRect.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,
aRect.x,
aRect.XMost(),
visibleRect.x,
visibleRect.XMost())) {
nscoord maxWidth;
scrollPt.x = ComputeWhereToScroll(aHorizontal.mWhereToScroll,
scrollPt.x,
aRect.x,
aRect.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) {
nsIScrollableFrame::ScrollMode scrollMode = nsIScrollableFrame::INSTANT;
bool autoBehaviorIsSmooth = (aFrameAsScrollable->GetScrollbarStyles().mScrollBehavior
== NS_STYLE_SCROLL_BEHAVIOR_SMOOTH);
bool smoothScroll = (aFlags & nsIPresShell::SCROLL_SMOOTH) ||
((aFlags & nsIPresShell::SCROLL_SMOOTH_AUTO) && autoBehaviorIsSmooth);
if (gfxPrefs::ScrollBehaviorEnabled() && smoothScroll) {
scrollMode = nsIScrollableFrame::SMOOTH_MSD;
}
aFrameAsScrollable->ScrollTo(scrollPt, scrollMode, &allowedRange);
}
}
nsresult
PresShell::ScrollContentIntoView(nsIContent* aContent,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
NS_ENSURE_TRUE(aContent, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIDocument> composedDoc = aContent->GetComposedDoc();
NS_ENSURE_STATE(composedDoc);
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,
nsINode::DeleteProperty<PresShell::ScrollIntoViewData>))) {
mContentToScrollTo = nullptr;
}
// Flush layout and attempt to scroll in the process.
composedDoc->SetNeedLayoutFlush();
composedDoc->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();
nsRect targetRect = rect;
if (container->StyleDisplay()->mOverflowClipBox ==
NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX) {
nsMargin padding = container->GetUsedPadding();
targetRect.Inflate(padding);
}
ScrollToShowRect(sf, targetRect - 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.ScaleToOtherAppUnitsRoundOut(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;
}
class PaintTimerCallBack final : public nsITimerCallback
{
public:
explicit PaintTimerCallBack(PresShell* aShell) : mShell(aShell) {}
NS_DECL_ISUPPORTS
NS_IMETHODIMP Notify(nsITimer* aTimer) final
{
mShell->SetNextPaintCompressed();
mShell->AddInvalidateHiddenPresShellObserver(mShell->GetPresContext()->RefreshDriver());
mShell->ScheduleViewManagerFlush();
return NS_OK;
}
private:
~PaintTimerCallBack() {}
PresShell* mShell;
};
NS_IMPL_ISUPPORTS(PaintTimerCallBack, nsITimerCallback)
void
PresShell::ScheduleViewManagerFlush(PaintType aType)
{
if (aType == PAINT_DELAYED_COMPRESS) {
// Delay paint for 1 second.
static const uint32_t kPaintDelayPeriod = 1000;
if (!mDelayedPaintTimer) {
mDelayedPaintTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
RefPtr<PaintTimerCallBack> cb = new PaintTimerCallBack(this);
mDelayedPaintTimer->InitWithCallback(cb, kPaintDelayPeriod, nsITimer::TYPE_ONE_SHOT);
}
return;
}
nsPresContext* presContext = GetPresContext();
if (presContext) {
presContext->RefreshDriver()->ScheduleViewManagerFlush();
}
if (mDocument) {
mDocument->SetNeedLayoutFlush();
}
}
bool
FlushLayoutRecursive(nsIDocument* aDocument,
void* aData = nullptr)
{
MOZ_ASSERT(!aData);
aDocument->EnumerateSubDocuments(FlushLayoutRecursive, nullptr);
aDocument->FlushPendingNotifications(Flush_Layout);
return true;
}
void
PresShell::DispatchSynthMouseMove(WidgetGUIEvent* aEvent,
bool aFlushOnHoverChange)
{
RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
if (restyleManager->IsServo()) {
NS_ERROR("stylo: cannot dispatch synthetic mouse moves when using a "
"ServoRestyleManager yet");
return;
}
uint32_t hoverGenerationBefore =
restyleManager->AsGecko()->GetHoverGeneration();
nsEventStatus status;
nsView* targetView = nsView::GetViewFor(aEvent->mWidget);
if (!targetView)
return;
targetView->GetViewManager()->DispatchEvent(aEvent, targetView, &status);
if (MOZ_UNLIKELY(mIsDestroying)) {
return;
}
if (aFlushOnHoverChange &&
hoverGenerationBefore != restyleManager->AsGecko()->GetHoverGeneration()) {
// Flush so that the resulting reflow happens now so that our caller
// can suppress any synthesized mouse moves caused by that reflow.
// This code only ever runs for the root document, but :hover changes
// can happen in descendant documents too, so make sure we flush
// all of them.
FlushLayoutRecursive(mDocument);
}
}
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) {
gCaptureInfo.mContent = nullptr;
// 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;
}
}
}
gCaptureInfo.mContent = nullptr;
}
// 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) {
gCaptureInfo.mContent = nullptr;
gCaptureInfo.mAllowed = false;
return;
}
nsIFrame* capturingFrame = gCaptureInfo.mContent->GetPrimaryFrame();
if (!capturingFrame) {
gCaptureInfo.mContent = nullptr;
gCaptureInfo.mAllowed = false;
return;
}
if (nsLayoutUtils::IsAncestorFrameCrossDoc(aFrame, capturingFrame)) {
gCaptureInfo.mContent = nullptr;
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<nsIDocShell> docShell(mPresContext->GetDocShell());
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::ScheduleBeforeFirstPaint()
{
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));
}
}
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;
}
ScheduleBeforeFirstPaint();
mPaintingSuppressed = false;
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
// let's assume that outline on a root frame is not supported
rootFrame->InvalidateFrame();
}
// now that painting is unsuppressed, focus may be set on the document
if (nsPIDOMWindowOuter* win = mDocument->GetWindow())
win->SetReadyForFocus();
if (!mHaveShutDown) {
SynthesizeMouseMove(false);
ScheduleApproximateFrameVisibilityUpdateNow();
}
}
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("PresShell", "Flush",
js::ProfileEntry::Category::GRAPHICS, "(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.
RefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
bool didStyleFlush = false;
bool didLayoutFlush = false;
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).
mDocument->FlushUserFontSet();
mPresContext->FlushCounterStyles();
// Flush any requested SMIL samples.
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->FlushResampleRequests();
}
if (aFlush.mFlushAnimations && mPresContext->EffectCompositor()) {
mPresContext->EffectCompositor()->PostRestyleForThrottledAnimations();
}
// The FlushResampleRequests() above flushed style changes.
if (!mIsDestroying) {
nsAutoScriptBlocker scriptBlocker;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
}
// 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;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
didStyleFlush = true;
// 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) {
didLayoutFlush = true;
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;
}
}
}
if (flushType >= Flush_Layout) {
if (!mIsDestroying) {
mViewManager->UpdateWidgetGeometry();
}
}
}
if (!didStyleFlush && flushType >= Flush_Style && !mIsDestroying) {
mDocument->SetNeedStyleFlush();
}
if (!didLayoutFlush && !mIsDestroying &&
(flushType >=
(mSuppressInterruptibleReflows ? Flush_Layout : Flush_InterruptibleLayout))) {
// We suppressed this flush due to mSuppressInterruptibleReflows or
// !isSafeToFlush, but the document thinks it doesn't
// need to flush anymore. Let it know what's really going on.
mDocument->SetNeedLayoutFlush();
}
}
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,
EventStates 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,
EventStates aStateMask)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected DocumentStatesChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
nsStyleSet* styleSet = mStyleSet->GetAsGecko();
if (!styleSet) {
// XXXheycam ServoStyleSets don't support document state selectors,
// but these are only used in chrome documents, which we are not
// aiming to support yet.
NS_ERROR("stylo: ServoStyleSets cannot respond to document state "
"changes yet");
return;
}
if (mDidInitialize &&
styleSet->HasDocumentStateDependentStyle(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,
const nsAttrValue* aNewValue)
{
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,
aNewValue);
VERIFY_STYLE_TREE;
}
}
void
PresShell::AttributeChanged(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
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,
aOldValue);
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.
if (aContainer->IsElement()) {
// Ensure the container is an element before trying to restyle
// because it can be the case that the container is a ShadowRoot
// which is a document fragment.
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 && aContainer->IsElement()) {
// Ensure the container is an element before trying to restyle
// because it can be the case that the container is a ShadowRoot
// which is a document fragment.
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");
// 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);
}
// After removing aChild from tree we should save information about live ancestor
if (mPointerEventTarget) {
if (nsContentUtils::ContentIsDescendantOf(mPointerEventTarget, aChild)) {
mPointerEventTarget = aContainer;
}
}
// We should check that aChild does not contain pointer capturing elements.
// If it does we should release the pointer capture for the elements.
for (auto iter = gPointerCaptureList->Iter(); !iter.Done(); iter.Next()) {
nsIPresShell::PointerCaptureInfo* data = iter.UserData();
if (data && data->mOverrideContent &&
nsContentUtils::ContentIsDescendantOf(data->mOverrideContent,
aChild)) {
nsIPresShell::ReleasePointerCapturingContent(iter.Key());
}
}
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;
}
void
PresShell::NotifyCounterStylesAreDirty()
{
nsAutoCauseReflowNotifier reflowNotifier(this);
mFrameConstructor->BeginUpdate();
mFrameConstructor->NotifyCounterStylesAreDirty();
mFrameConstructor->EndUpdate();
}
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::RestyleForCSSRuleChanges()
{
AutoTArray<RefPtr<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;
}
mDocument->RebuildUserFontSet();
if (mPresContext) {
mPresContext->RebuildCounterStyles();
}
Element* root = mDocument->GetRootElement();
if (!mDidInitialize) {
// Nothing to do here, since we have no frames yet
return;
}
if (!root) {
// No content to restyle
return;
}
RestyleManagerHandle 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 (Element* scopeRoot : scopeRoots) {
restyleManager->PostRestyleEvent(scopeRoot, eRestyle_Subtree,
NS_STYLE_HINT_NONE);
}
}
}
void
PresShell::RecordStyleSheetChange(StyleSheetHandle aStyleSheet)
{
// too bad we can't check that the update is UPDATE_STYLE
NS_ASSERTION(mUpdateCount != 0, "must be in an update");
if (mStylesHaveChanged)
return;
if (aStyleSheet->IsGecko()) {
// XXXheycam ServoStyleSheets don't support <style scoped> yet.
Element* scopeElement = aStyleSheet->AsGecko()->GetScopeElement();
if (scopeElement) {
mChangedScopeStyleRoots.AppendElement(scopeElement);
return;
}
} else {
NS_ERROR("stylo: ServoStyleSheets don't support <style scoped>");
}
mStylesHaveChanged = true;
}
void
PresShell::StyleSheetAdded(StyleSheetHandle 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(StyleSheetHandle 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(StyleSheetHandle aStyleSheet)
{
if (aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleRuleChanged(StyleSheetHandle aStyleSheet)
{
RecordStyleSheetChange(aStyleSheet);
}
void
PresShell::StyleRuleAdded(StyleSheetHandle aStyleSheet)
{
RecordStyleSheetChange(aStyleSheet);
}
void
PresShell::StyleRuleRemoved(StyleSheetHandle aStyleSheet)
{
RecordStyleSheetChange(aStyleSheet);
}
nsIFrame*
PresShell::GetPlaceholderFrameFor(nsIFrame* aFrame) const
{
return mFrameConstructor->GetPlaceholderFrameFor(aFrame);
}
static void
SendUpdateVisibleRegion(CompositorBridgeChild* aCompositorChild,
const VisibleRegions& aRegions,
VisibilityCounter aCounter,
uint64_t aLayersId,
uint32_t aPresShellId)
{
for (auto iter = aRegions.ConstIter(); !iter.Done(); iter.Next()) {
const ViewID viewId = iter.Key();
const CSSIntRegion* region = iter.UserData();
MOZ_ASSERT(region);
const ScrollableLayerGuid guid(aLayersId, aPresShellId, viewId);
aCompositorChild->SendUpdateVisibleRegion(aCounter, guid, *region);
}
}
void
PresShell::NotifyCompositorOfVisibleRegionsChange()
{
mNotifyCompositorOfVisibleRegionsChangeEvent.Revoke();
if (!mVisibleRegions) {
return;
}
// Retrieve the layers ID and pres shell ID.
TabChild* tabChild = TabChild::GetFrom(this);
if (!tabChild) {
return;
}
const uint64_t layersId = tabChild->LayersId();
const uint32_t presShellId = GetPresShellId();
// Retrieve the CompositorBridgeChild, which we'll use to communicate with
// the compositor.
LayerManager* layerManager = GetRootLayerManager();
if (!layerManager) {
return;
}
ClientLayerManager* clientLayerManager = layerManager->AsClientLayerManager();
if (!clientLayerManager) {
return;
}
CompositorBridgeChild* compositorChild = clientLayerManager->GetCompositorBridgeChild();
if (!compositorChild) {
return;
}
// Clear the old visible regions associated with this pres shell.
compositorChild->SendClearVisibleRegions(layersId, presShellId);
// Send the new visible regions to the compositor.
SendUpdateVisibleRegion(compositorChild,
mVisibleRegions->mApproximate,
VisibilityCounter::MAY_BECOME_VISIBLE,
layersId, presShellId);
SendUpdateVisibleRegion(compositorChild,
mVisibleRegions->mInDisplayPort,
VisibilityCounter::IN_DISPLAYPORT,
layersId, presShellId);
}
template <typename Func> void
ForAllTrackedFramesInVisibleSet(const VisibleFrames& aFrames, Func aFunc)
{
for (auto iter = aFrames.ConstIter(); !iter.Done(); iter.Next()) {
nsIFrame* frame = iter.Get()->GetKey();
// Call |aFunc| if we're still tracking the frame's visibility. (We may
// not be, if the frame disabled visibility tracking after we added it to
// the visible frames list.)
if (frame->TrackingVisibility()) {
aFunc(frame);
}
}
}
void
PresShell::VisibleFramesContainer::AddFrame(nsIFrame* aFrame,
VisibilityCounter aCounter)
{
MOZ_ASSERT(aFrame->TrackingVisibility());
VisibleFrames& frameSet = ForCounter(aCounter);
uint32_t count = frameSet.Count();
frameSet.PutEntry(aFrame);
if (frameSet.Count() == count) {
return; // The frame was already present.
}
if (mSuppressingVisibility) {
return; // We're not updating visibility counters right now.
}
aFrame->IncVisibilityCount(aCounter);
}
void
PresShell::VisibleFramesContainer::RemoveFrame(nsIFrame* aFrame,
VisibilityCounter aCounter)
{
VisibleFrames& frameSet = ForCounter(aCounter);
uint32_t count = frameSet.Count();
frameSet.RemoveEntry(aFrame);
if (frameSet.Count() == count) {
return; // The frame wasn't present.
}
if (mSuppressingVisibility) {
return; // We're not updating visibility counters right now.
}
if (!aFrame->TrackingVisibility()) {
// We stopped tracking visibility for this frame after it got added to the
// set. We don't need to update counters.
return;
}
aFrame->DecVisibilityCount(aCounter);
}
void
PresShell::VisibleFramesContainer::SuppressVisibility()
{
if (mSuppressingVisibility) {
return; // Nothing to do.
}
mSuppressingVisibility = true;
// Decrement counters for all the frames we're tracking right now to
// maintain the invariant that when visibility is suppressed we don't
// increment the counters for any of the frames in our sets. Note that we
// decrement the visibility counters from lowest to highest priority to
// minimize the number of notifications we have to send - for example, if a
// frame is both MAY_BECOME_VISIBLE and IN_DISPLAYPORT, decrementing
// IN_DISPLAYPORT first would send it to the MAY_BECOME_VISIBLE state, and
// then decrementing MAY_BECOME_VISIBLE would send it to the NONVISIBLE
// state, whereas decrementing in the other order transitions the frame
// directly from IN_DISPLAYPORT to NONVISIBLE since the frame remains
// IN_DISPLAYPORT even if its MAY_BECOME_VISIBLE counter is 0.
ForAllTrackedFramesInVisibleSet(mApproximate, [&](nsIFrame* aFrame) {
aFrame->DecVisibilityCount(VisibilityCounter::MAY_BECOME_VISIBLE);
});
ForAllTrackedFramesInVisibleSet(mInDisplayPort, [&](nsIFrame* aFrame) {
aFrame->DecVisibilityCount(VisibilityCounter::IN_DISPLAYPORT);
});
}
void
PresShell::VisibleFramesContainer::UnsuppressVisibility()
{
if (!mSuppressingVisibility) {
return; // Nothing to do.
}
mSuppressingVisibility = false;
// Increment counters for all the frames we're tracking right now to
// maintain the invariant that when visibility is not suppressed we
// increment the counters for the frames in our sets - this is the normal
// state, in other words. See SuppressVisibility() for why we increment in
// this order - the same reasoning applies, but in reverse.
ForAllTrackedFramesInVisibleSet(mInDisplayPort, [&](nsIFrame* aFrame) {
aFrame->IncVisibilityCount(VisibilityCounter::IN_DISPLAYPORT);
});
ForAllTrackedFramesInVisibleSet(mApproximate, [&](nsIFrame* aFrame) {
aFrame->IncVisibilityCount(VisibilityCounter::MAY_BECOME_VISIBLE);
});
}
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(Color::FromABGR(aBackgroundColor));
aThebesContext->Fill();
return NS_OK;
}
gfxContextAutoSaveRestore save(aThebesContext);
MOZ_ASSERT(aThebesContext->CurrentOp() == CompositionOp::OP_OVER);
aThebesContext->Clip();
nsDeviceContext* devCtx = mPresContext->DeviceContext();
gfxPoint offset(-nsPresContext::AppUnitsToFloatCSSPixels(aRect.x),
-nsPresContext::AppUnitsToFloatCSSPixels(aRect.y));
gfxFloat scale = gfxFloat(devCtx->AppUnitsPerDevPixel())/nsPresContext::AppUnitsPerCSSPixel();
// Since canvas APIs use floats to set up their matrices, we may have some
// slight rounding errors here. We use NudgeToIntegers() here to adjust
// matrix components that are integers up to the accuracy of floats to be
// those integers.
gfxMatrix newTM = aThebesContext->CurrentMatrix().Translate(offset).
Scale(scale, scale).
NudgeToIntegers();
aThebesContext->SetMatrix(newTM);
AutoSaveRestoreRenderingState _(this);
nsRenderingContext rc(aThebesContext);
bool wouldFlushRetainedLayers = false;
PaintFrameFlags flags = PaintFrameFlags::PAINT_IGNORE_SUPPRESSION;
if (aThebesContext->CurrentMatrix().HasNonIntegerTranslation()) {
flags |= PaintFrameFlags::PAINT_IN_TRANSFORM;
}
if (!(aFlags & RENDER_ASYNC_DECODE_IMAGES)) {
flags |= PaintFrameFlags::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) {
LayerManager* layerManager = view->GetWidget()->GetLayerManager();
// ClientLayerManagers in content processes don't support
// taking snapshots.
if (layerManager &&
(!layerManager->AsClientLayerManager() ||
XRE_IsParentProcess())) {
flags |= PaintFrameFlags::PAINT_WIDGET_LAYERS;
}
}
}
if (!(aFlags & RENDER_CARET)) {
wouldFlushRetainedLayers = true;
flags |= PaintFrameFlags::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 |= PaintFrameFlags::PAINT_DOCUMENT_RELATIVE;
}
// Don't let drawWindow blow away our retained layer tree
if ((flags & PaintFrameFlags::PAINT_WIDGET_LAYERS) && wouldFlushRetainedLayers) {
flags &= ~PaintFrameFlags::PAINT_WIDGET_LAYERS;
}
// We don't update the visible regions here because we're not painting to
// the window, and hence there should be no change.
nsLayoutUtils::PaintFrame(&rc, rootFrame, nsRegion(aRect),
aBackgroundColor,
nsDisplayListBuilderMode::PAINTING,
flags);
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 (or above,
// in vertical mode) the start point, so x (or y) is set to the
// lower of the values.
nsRect textRect(aBuilder->ToReferenceFrame(frame), frame->GetSize());
if (frame->GetWritingMode().IsVertical()) {
nscoord y = std::min(startPoint.y, endPoint.y);
textRect.y += y;
textRect.height = std::max(startPoint.y, endPoint.y) - y;
} else {
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->GetUncomposedDoc() ==
aRange->GetStartParent()->GetUncomposedDoc()) {
// 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
UniquePtr<RangePaintInfo>
PresShell::CreateRangePaintInfo(nsIDOMRange* aRange,
nsRect& aSurfaceRect,
bool aForPrimarySelection)
{
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->GetComposedDoc();
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();
// XXX deal with ancestorFrame being null due to display:contents
// use the nearest ancestor frame that includes all continuations as the
// root for building the display list
while (ancestorFrame &&
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(ancestorFrame))
ancestorFrame = ancestorFrame->GetParent();
}
if (!ancestorFrame) {
return nullptr;
}
// get a display list containing the range
auto info = MakeUnique<RangePaintInfo>(range, ancestorFrame);
info->mBuilder.SetIncludeAllOutOfFlows();
if (aForPrimarySelection) {
info->mBuilder.SetSelectedFramesOnly();
}
info->mBuilder.EnterPresShell(ancestorFrame);
nsCOMPtr<nsIContentIterator> iter = NS_NewContentSubtreeIterator();
nsresult rv = iter->Init(range);
if (NS_FAILED(rv)) {
return nullptr;
}
auto BuildDisplayListForNode = [&] (nsINode* aNode) {
if (MOZ_UNLIKELY(!aNode->IsContent())) {
return;
}
nsIFrame* frame = aNode->AsContent()->GetPrimaryFrame();
// XXX deal with frame being null due to display:contents
for (; frame; frame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(frame)) {
frame->BuildDisplayListForStackingContext(&info->mBuilder,
frame->GetVisualOverflowRect(), &info->mList);
}
};
if (startParent->NodeType() == nsIDOMNode::TEXT_NODE) {
BuildDisplayListForNode(startParent);
}
for (; !iter->IsDone(); iter->Next()) {
nsCOMPtr<nsINode> node = iter->GetCurrentNode();
BuildDisplayListForNode(node);
}
if (endParent != startParent &&
endParent->NodeType() == nsIDOMNode::TEXT_NODE) {
BuildDisplayListForNode(endParent);
}
#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);
#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<SourceSurface>
PresShell::PaintRangePaintInfo(const nsTArray<UniquePtr<RangePaintInfo>>& aItems,
nsISelection* aSelection,
nsIntRegion* aRegion,
nsRect aArea,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags)
{
nsPresContext* pc = GetPresContext();
if (!pc || aArea.width == 0 || aArea.height == 0)
return nullptr;
// use the rectangle to create the surface
nsIntRect pixelArea = aArea.ToOutsidePixels(pc->AppUnitsPerDevPixel());
// if the image should not be resized, the scale, relative to the original image, must be 1
float scale = 1.0;
nsIntRect rootScreenRect =
GetRootFrame()->GetScreenRectInAppUnits().ToNearestPixels(
pc->AppUnitsPerDevPixel());
nsRect maxSize;
pc->DeviceContext()->GetClientRect(maxSize);
// check if the image should be resized
bool resize = aFlags & RENDER_AUTO_SCALE;
if (resize) {
// check if image-resizing-algorithm should be used
if (aFlags & RENDER_IS_IMAGE) {
// get max screensize
nscoord maxWidth = pc->AppUnitsToDevPixels(maxSize.width);
nscoord maxHeight = pc->AppUnitsToDevPixels(maxSize.height);
// resize image relative to the screensize
// get best height/width relative to screensize
float bestHeight = float(maxHeight)*RELATIVE_SCALEFACTOR;
float bestWidth = float(maxWidth)*RELATIVE_SCALEFACTOR;
// get scalefactor to reach bestWidth
scale = bestWidth / float(pixelArea.width);
// get the worst height (height when width is perfect)
float worstHeight = float(pixelArea.height)*scale;
// get the difference of best and worst height
float difference = bestHeight - worstHeight;
// half the difference and add it to worstHeight,
// then get scalefactor to reach this
scale = (worstHeight + difference / 2) / float(pixelArea.height);
} else {
// get half of max screensize
nscoord maxWidth = pc->AppUnitsToDevPixels(maxSize.width >> 1);
nscoord maxHeight = pc->AppUnitsToDevPixels(maxSize.height >> 1);
if (pixelArea.width > maxWidth || pixelArea.height > maxHeight) {
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);
if (!pixelArea.width || !pixelArea.height)
return nullptr;
// 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;
RefPtr<DrawTarget> dt =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
IntSize(pixelArea.width, pixelArea.height),
SurfaceFormat::B8G8R8A8);
if (!dt || !dt->IsValid()) {
return nullptr;
}
RefPtr<gfxContext> ctx = gfxContext::CreateOrNull(dt);
MOZ_ASSERT(ctx); // already checked the draw target above
if (aRegion) {
// Convert aRegion from CSS pixels to dev pixels
nsIntRegion region =
aRegion->ToAppUnits(nsPresContext::AppUnitsPerCSSPixel())
.ToOutsidePixels(pc->AppUnitsPerDevPixel());
for (auto iter = region.RectIter(); !iter.Done(); iter.Next()) {
const nsIntRect& rect = iter.Get();
ctx->Clip(gfxRect(rect.x, rect.y, rect.width, rect.height));
}
}
nsRenderingContext rc(ctx);
gfxMatrix initialTM = ctx->CurrentMatrix();
if (resize)
initialTM.Scale(scale, scale);
// translate so that points are relative to the surface area
gfxPoint surfaceOffset =
nsLayoutUtils::PointToGfxPoint(-aArea.TopLeft(), pc->AppUnitsPerDevPixel());
initialTM.Translate(surfaceOffset);
// temporarily hide the selection so that text is drawn normally. If a
// selection is being rendered, use that, otherwise use the presshell's
// selection.
RefPtr<nsFrameSelection> frameSelection;
if (aSelection) {
frameSelection = aSelection->AsSelection()->GetFrameSelection();
}
else {
frameSelection = FrameSelection();
}
int16_t oldDisplaySelection = frameSelection->GetDisplaySelection();
frameSelection->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
// next, paint each range in the selection
for (const UniquePtr<RangePaintInfo>& rangeInfo : aItems) {
// the display lists paint relative to the offset from the reference
// frame, so account for that translation too:
gfxPoint rootOffset =
nsLayoutUtils::PointToGfxPoint(rangeInfo->mRootOffset,
pc->AppUnitsPerDevPixel());
ctx->SetMatrix(initialTM.Translate(rootOffset));
aArea.MoveBy(-rangeInfo->mRootOffset.x, -rangeInfo->mRootOffset.y);
nsRegion visible(aArea);
RefPtr<LayerManager> layerManager =
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 dt->Snapshot();
}
already_AddRefed<SourceSurface>
PresShell::RenderNode(nsIDOMNode* aNode,
nsIntRegion* aRegion,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags)
{
// area will hold the size of the surface needed to draw the node, measured
// from the root frame.
nsRect area;
nsTArray<UniquePtr<RangePaintInfo>> rangeItems;
// nothing to draw if the node isn't in a document
nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
if (!node->IsInUncomposedDoc())
return nullptr;
RefPtr<nsRange> range = new nsRange(node);
if (NS_FAILED(range->SelectNode(aNode)))
return nullptr;
UniquePtr<RangePaintInfo> info = CreateRangePaintInfo(range, area, false);
if (info && !rangeItems.AppendElement(Move(info))) {
return nullptr;
}
if (aRegion) {
// combine the area with the supplied region
nsIntRect rrectPixels = aRegion->GetBounds();
nsRect rrect = ToAppUnits(rrectPixels, 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, aFlags);
}
already_AddRefed<SourceSurface>
PresShell::RenderSelection(nsISelection* aSelection,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags)
{
// area will hold the size of the surface needed to draw the selection,
// measured from the root frame.
nsRect area;
nsTArray<UniquePtr<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));
UniquePtr<RangePaintInfo> info = CreateRangePaintInfo(range, area, true);
if (info && !rangeItems.AppendElement(Move(info))) {
return nullptr;
}
}
return PaintRangePaintInfo(rangeItems, aSelection, nullptr, area, aPoint,
aScreenRect, aFlags);
}
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, bool aCSSBackgroundColor)
{
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 &&
!(i->GetType() == nsDisplayItem::TYPE_BLEND_CONTAINER && !aCSSBackgroundColor) &&
AddCanvasBackgroundColor(*sublist, aCanvasFrame, aColor, aCSSBackgroundColor))
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, mHasCSSBackgroundColor))
return;
}
}
}
aList.AppendNewToBottom(
new (&aBuilder) nsDisplaySolidColor(&aBuilder, aFrame, aBounds, bgcolor));
}
static bool IsTransparentContainerElement(nsPresContext* aPresContext)
{
nsCOMPtr<nsIDocShell> docShell = aPresContext->GetDocShell();
if (!docShell) {
return false;
}
nsCOMPtr<nsPIDOMWindowOuter> pwin = docShell->GetWindow();
if (!pwin)
return false;
nsCOMPtr<Element> containerElement = pwin->GetFrameElementInternal();
TabChild* tab = TabChild::GetFrom(docShell);
if (tab) {
// Check if presShell is the top PresShell. Only the top can
// influence the canvas background color.
nsCOMPtr<nsIPresShell> presShell = aPresContext->GetPresShell();
nsCOMPtr<nsIPresShell> topPresShell = tab->GetPresShell();
if (presShell != topPresShell) {
tab = nullptr;
}
}
return (containerElement &&
containerElement->HasAttr(kNameSpaceID_None, nsGkAtoms::transparent))
|| (tab && tab->IsTransparent());
}
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);
mHasCSSBackgroundColor = drawBackgroundColor;
if (mPresContext->IsRootContentDocument() &&
!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();
}
}
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;
}
LayerManager*
PresShell::GetRootLayerManager()
{
MOZ_ASSERT(mViewManager);
nsViewManager* viewManager = mViewManager;
while (nsView* view = viewManager->GetRootView()) {
if (nsIWidget* widget = view->GetWidget()) {
return widget->GetLayerManager();
}
nsView* parentView = view->GetParent();
if (!parentView) {
return nullptr;
}
viewManager = parentView->GetViewManager();
}
return nullptr;
}
bool PresShell::AsyncPanZoomEnabled()
{
NS_ASSERTION(mViewManager, "Should have view manager");
nsView* rootView = mViewManager->GetRootView();
if (rootView) {
if (nsIWidget* widget = rootView->GetWidget()) {
return widget->AsyncPanZoomEnabled();
}
}
return gfxPlatform::AsyncPanZoomEnabled();
}
void PresShell::SetIgnoreViewportScrolling(bool aIgnore)
{
if (IgnoringViewportScrolling() == aIgnore) {
return;
}
RenderingState state(this);
state.mRenderFlags = ChangeFlag(state.mRenderFlags, aIgnore,
STATE_IGNORING_VIEWPORT_SCROLLING);
SetRenderingState(state);
}
nsresult PresShell::SetResolutionImpl(float aResolution, bool aScaleToResolution)
{
if (!(aResolution > 0.0)) {
return NS_ERROR_ILLEGAL_VALUE;
}
if (aResolution == mResolution.valueOr(0.0)) {
MOZ_ASSERT(mResolution.isSome());
return NS_OK;
}
RenderingState state(this);
state.mResolution = Some(aResolution);
SetRenderingState(state);
mScaleToResolution = aScaleToResolution;
if (mMobileViewportManager) {
mMobileViewportManager->ResolutionUpdated();
}
return NS_OK;
}
bool PresShell::ScaleToResolution() const
{
return mScaleToResolution;
}
float PresShell::GetCumulativeResolution()
{
float resolution = GetResolution();
nsPresContext* parentCtx = GetPresContext()->GetParentPresContext();
if (parentCtx) {
resolution *= parentCtx->PresShell()->GetCumulativeResolution();
}
return resolution;
}
float PresShell::GetCumulativeNonRootScaleResolution()
{
float resolution = 1.0;
nsIPresShell* currentShell = this;
while (currentShell) {
nsPresContext* currentCtx = currentShell->GetPresContext();
if (currentCtx != currentCtx->GetRootPresContext()) {
resolution *= currentShell->ScaleToResolution() ? currentShell->GetResolution() : 1.0f;
}
nsPresContext* parentCtx = currentCtx->GetParentPresContext();
if (parentCtx) {
currentShell = parentCtx->PresShell();
} else {
currentShell = nullptr;
}
}
return resolution;
}
void PresShell::SetRestoreResolution(float aResolution)
{
if (mMobileViewportManager) {
mMobileViewportManager->SetRestoreResolution(aResolution);
}
}
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;
mResolution = aState.mResolution;
}
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()) {
RefPtr<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;
// mRefPoint 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.ScaleToOtherAppUnits(APD, viewAPD);
refpoint -= view->GetOffsetTo(rootView);
refpoint += view->ViewToWidgetOffset();
}
NS_ASSERTION(view->GetWidget(), "view should have a widget here");
WidgetMouseEvent event(true, eMouseMove, view->GetWidget(),
WidgetMouseEvent::eSynthesized);
event.mRefPoint =
LayoutDeviceIntPoint::FromAppUnitsToNearest(refpoint, viewAPD);
event.mTime = PR_IntervalNow();
// XXX set event.mModifiers ?
// XXX mnakano I think that we should get the latest information from widget.
nsCOMPtr<nsIPresShell> shell = pointVM->GetPresShell();
if (shell) {
// Since this gets run in a refresh tick there isn't an InputAPZContext on
// the stack from the nsBaseWidget. We need to simulate one with at least
// the correct target guid, so that the correct callback transform gets
// applied if this event goes to a child process. The input block id is set
// to 0 because this is a synthetic event which doesn't really belong to any
// input block. Same for the APZ response field.
InputAPZContext apzContext(mMouseEventTargetGuid, 0, nsEventStatus_eIgnore);
shell->DispatchSynthMouseMove(&event, !aFromScroll);
}
if (!aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
}
void
PresShell::AddFrameToVisibleRegions(nsIFrame* aFrame, VisibilityCounter aForCounter)
{
if (!mVisibleRegions) {
return;
}
MOZ_ASSERT(aFrame);
// Retrieve the view ID for this frame (which we obtain from the enclosing
// scrollable frame).
nsIScrollableFrame* scrollableFrame =
nsLayoutUtils::GetNearestScrollableFrame(aFrame,
nsLayoutUtils::SCROLLABLE_ONLY_ASYNC_SCROLLABLE |
nsLayoutUtils::SCROLLABLE_ALWAYS_MATCH_ROOT);
if (!scrollableFrame) {
return;
}
nsIFrame* scrollableFrameAsFrame = do_QueryFrame(scrollableFrame);
MOZ_ASSERT(scrollableFrameAsFrame);
nsIContent* scrollableFrameContent = scrollableFrameAsFrame->GetContent();
if (!scrollableFrameContent) {
return;
}
ViewID viewID;
if (!nsLayoutUtils::FindIDFor(scrollableFrameContent, &viewID)) {
return ;
}
// Update the visible region for the appropriate view ID.
nsRect frameRectInScrolledFrameSpace = aFrame->GetVisualOverflowRect();
nsLayoutUtils::TransformResult result =
nsLayoutUtils::TransformRect(aFrame,
scrollableFrame->GetScrolledFrame(),
frameRectInScrolledFrameSpace);
if (result != nsLayoutUtils::TransformResult::TRANSFORM_SUCCEEDED) {
return;
}
VisibleRegions& regions = mVisibleRegions->ForCounter(aForCounter);
CSSIntRegion* regionForView = regions.LookupOrAdd(viewID);
MOZ_ASSERT(regionForView);
regionForView->OrWith(CSSPixel::FromAppUnitsRounded(frameRectInScrolledFrameSpace));
}
/* static */ void
PresShell::MarkFramesInListApproximatelyVisible(const nsDisplayList& aList)
{
for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) {
nsDisplayList* sublist = item->GetChildren();
if (sublist) {
MarkFramesInListApproximatelyVisible(*sublist);
continue;
}
nsIFrame* frame = item->Frame();
MOZ_ASSERT(frame);
if (!frame->TrackingVisibility()) {
continue;
}
// Use the presshell containing the frame.
auto* presShell = static_cast<PresShell*>(frame->PresContext()->PresShell());
MOZ_ASSERT(!presShell->AssumeAllFramesVisible());
presShell->mVisibleFrames.AddFrame(frame, VisibilityCounter::MAY_BECOME_VISIBLE);
presShell->AddFrameToVisibleRegions(frame, VisibilityCounter::MAY_BECOME_VISIBLE);
}
}
/**
* This RAII class automatically handles updating visible frames sets. It also
* handles updating visible regions (used for the APZ minimap debugger) when
* the appropriate prefs are enabled.
*
* Because we don't want to cause unnecessary IPC traffic between the content
* process and the compositor process, avoid nesting multiple
* AutoUpdateVisibility instances. Instead, pass a list of VisibilityCounters
* for all the types of visibility you want to update to
* AutoUpdateVisibility's constructor.
*
* Normally the compositor is notified of new visible regions synchronously;
* however, this is not safe within a layers transaction. In that situation,
* specify Notify::eAsync to delay notifying the compositor until the
* transaction is complete. Regardless, the visible frame sets themselves are
* always updating synchronously.
*/
struct MOZ_STACK_CLASS AutoUpdateVisibility
{
enum class Notify
{
eSync,
eAsync
};
AutoUpdateVisibility(PresShell* aPresShell,
std::initializer_list<VisibilityCounter> aCounters,
Maybe<OnNonvisible> aNonvisibleAction = Nothing())
: AutoUpdateVisibility(aPresShell, Notify::eSync, aCounters, aNonvisibleAction)
{ }
AutoUpdateVisibility(PresShell* aPresShell,
Notify aNotifyStrategy,
std::initializer_list<VisibilityCounter> aCounters,
Maybe<OnNonvisible> aNonvisibleAction = Nothing())
: mNonvisibleAction(aNonvisibleAction)
, mPresShell(aPresShell)
, mNotifyStrategy(aNotifyStrategy)
{
// If visibility tracking is suppressed, we're not incrementing or
// decrementing visibility counters and we don't want to visualize visible
// regions, so we can just clear the visible frame sets and skip the rest.
if (mPresShell->mVisibleFrames.IsVisibilitySuppressed()) {
mPresShell->mVisibleFrames.mApproximate.Clear();
mPresShell->mVisibleFrames.mInDisplayPort.Clear();
mPresShell->mVisibleRegions = nullptr;
return;
}
// Clear the visible frames sets we're updating, but save the old set so
// we can decrement their counter later. This is how we mark frames
// nonvisible if they don't end up in the set during the visibility
// update.
for (VisibilityCounter counter : aCounters) {
switch (counter) {
case VisibilityCounter::MAY_BECOME_VISIBLE:
mOldApproximatelyVisibleFrames.emplace();
mPresShell->mVisibleFrames.mApproximate.SwapElements(*mOldApproximatelyVisibleFrames);
break;
case VisibilityCounter::IN_DISPLAYPORT:
mOldInDisplayPortFrames.emplace();
mPresShell->mVisibleFrames.mInDisplayPort.SwapElements(*mOldInDisplayPortFrames);
break;
}
}
// If we're not visualizing visible regions, we're done.
if (!gfxPrefs::APZMinimap() ||
!gfxPrefs::APZMinimapVisibilityEnabled()) {
mPresShell->mVisibleRegions = nullptr;
return;
}
// We're visualizing visible regions, so initialize a
// VisibleRegionsContainer to store them. Visibility-related functions we
// call will only do the work of populating this object and sending it to
// the compositor if we've created it, so we don't need to check the prefs
// everywhere.
if (mPresShell->mVisibleRegions) {
// Clear the regions we're about to update. We don't want to clear them
// all - we only clear the ones being updated. Otherwise, different
// visibility tracking methods will interfere with each other.
for (VisibilityCounter counter : aCounters) {
VisibleRegions& regions =
mPresShell->mVisibleRegions->ForCounter(counter);
regions.Clear();
}
return;
}
mPresShell->mVisibleRegions =
MakeUnique<PresShell::VisibleRegionsContainer>();
}
~AutoUpdateVisibility()
{
// Decrement the counters for the old visible frames sets now. If they
// didn't get incremented during the visibility update, this will mark
// them nonvisible.
if (mOldApproximatelyVisibleFrames) {
ForAllTrackedFramesInVisibleSet(*mOldApproximatelyVisibleFrames, [&](nsIFrame* aFrame) {
aFrame->DecVisibilityCount(VisibilityCounter::MAY_BECOME_VISIBLE,
mNonvisibleAction);
});
}
if (mOldInDisplayPortFrames) {
ForAllTrackedFramesInVisibleSet(*mOldInDisplayPortFrames, [&](nsIFrame* aFrame) {
aFrame->DecVisibilityCount(VisibilityCounter::IN_DISPLAYPORT,
mNonvisibleAction);
});
}
// If we're not visualizing visible regions, we're done.
if (!mPresShell->mVisibleRegions) {
return;
}
if (mNotifyStrategy == Notify::eSync) {
mPresShell->NotifyCompositorOfVisibleRegionsChange();
return;
}
if (mPresShell->mNotifyCompositorOfVisibleRegionsChangeEvent.IsPending()) {
return; // An async notify is already pending.
}
// Asynchronously notify the compositor of the new visible regions.
RefPtr<nsRunnableMethod<PresShell>> event =
NewRunnableMethod(mPresShell, &PresShell::NotifyCompositorOfVisibleRegionsChange);
if (NS_SUCCEEDED(NS_DispatchToMainThread(event))) {
mPresShell->mNotifyCompositorOfVisibleRegionsChangeEvent = event;
}
}
private:
Maybe<VisibleFrames> mOldApproximatelyVisibleFrames;
Maybe<VisibleFrames> mOldInDisplayPortFrames;
Maybe<OnNonvisible> mNonvisibleAction;
PresShell* mPresShell;
Notify mNotifyStrategy;
};
void
PresShell::RebuildApproximateFrameVisibilityDisplayList(const nsDisplayList& aList)
{
MOZ_ASSERT(!mApproximateFrameVisibilityVisited, "already visited?");
mApproximateFrameVisibilityVisited = true;
AutoUpdateVisibility update(this, { VisibilityCounter::MAY_BECOME_VISIBLE });
MarkFramesInListApproximatelyVisible(aList);
}
/* static */ void
PresShell::ClearVisibleFramesForUnvisitedPresShells(nsView* aView, bool aClear)
{
nsViewManager* vm = aView->GetViewManager();
if (aClear) {
PresShell* presShell = static_cast<PresShell*>(vm->GetPresShell());
if (!presShell->mApproximateFrameVisibilityVisited) {
presShell->ClearVisibleFramesSets();
}
presShell->mApproximateFrameVisibilityVisited = false;
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
ClearVisibleFramesForUnvisitedPresShells(v, v->GetViewManager() != vm);
}
}
void
PresShell::ClearVisibleFramesSets(Maybe<OnNonvisible> aNonvisibleAction
/* = Nothing() */)
{
// Do an empty update, which will clear any existing visible frames and
// regions.
AutoUpdateVisibility update(this, {
VisibilityCounter::MAY_BECOME_VISIBLE,
VisibilityCounter::IN_DISPLAYPORT
}, aNonvisibleAction);
}
void
PresShell::MarkFramesInSubtreeApproximatelyVisible(nsIFrame* aFrame,
const nsRect& aRect,
bool aRemoveOnly /* = false */)
{
MOZ_ASSERT(aFrame->PresContext()->PresShell() == this, "wrong presshell");
if (aFrame->TrackingVisibility() &&
aFrame->StyleVisibility()->IsVisible() &&
(!aRemoveOnly || aFrame->IsVisibleOrMayBecomeVisibleSoon())) {
MOZ_ASSERT(!AssumeAllFramesVisible());
mVisibleFrames.AddFrame(aFrame, VisibilityCounter::MAY_BECOME_VISIBLE);
AddFrameToVisibleRegions(aFrame, VisibilityCounter::MAY_BECOME_VISIBLE);
}
nsSubDocumentFrame* subdocFrame = do_QueryFrame(aFrame);
if (subdocFrame) {
nsIPresShell* presShell = subdocFrame->GetSubdocumentPresShellForPainting(
nsSubDocumentFrame::IGNORE_PAINT_SUPPRESSION);
if (presShell && !presShell->AssumeAllFramesVisible()) {
nsRect rect = aRect;
nsIFrame* root = presShell->GetRootFrame();
if (root) {
rect.MoveBy(aFrame->GetOffsetToCrossDoc(root));
} else {
rect.MoveBy(-aFrame->GetContentRectRelativeToSelf().TopLeft());
}
rect = rect.ScaleToOtherAppUnitsRoundOut(
aFrame->PresContext()->AppUnitsPerDevPixel(),
presShell->GetPresContext()->AppUnitsPerDevPixel());
presShell->RebuildApproximateFrameVisibility(&rect);
}
return;
}
nsRect rect = aRect;
nsIScrollableFrame* scrollFrame = do_QueryFrame(aFrame);
if (scrollFrame) {
scrollFrame->NotifyApproximateFrameVisibilityUpdate();
nsRect displayPort;
bool usingDisplayport =
nsLayoutUtils::GetDisplayPortForVisibilityTesting(
aFrame->GetContent(), &displayPort, RelativeTo::ScrollFrame);
if (usingDisplayport) {
rect = displayPort;
} else {
rect = rect.Intersect(scrollFrame->GetScrollPortRect());
}
rect = scrollFrame->ExpandRectToNearlyVisible(rect);
}
bool preserves3DChildren = aFrame->Extend3DContext();
// We assume all frames in popups are visible, so we skip them here.
const nsIFrame::ChildListIDs skip(nsIFrame::kPopupList |
nsIFrame::kSelectPopupList);
for (nsIFrame::ChildListIterator childLists(aFrame);
!childLists.IsDone(); childLists.Next()) {
if (skip.Contains(childLists.CurrentID())) {
continue;
}
for (nsIFrame* child : childLists.CurrentList()) {
nsRect r = rect - child->GetPosition();
if (!r.IntersectRect(r, child->GetVisualOverflowRect())) {
continue;
}
if (child->IsTransformed()) {
// for children of a preserve3d element we just pass down the same dirty rect
if (!preserves3DChildren || !child->Combines3DTransformWithAncestors()) {
const nsRect overflow = child->GetVisualOverflowRectRelativeToSelf();
nsRect out;
if (nsDisplayTransform::UntransformRect(r, overflow, child, &out)) {
r = out;
} else {
r.SetEmpty();
}
}
}
MarkFramesInSubtreeApproximatelyVisible(child, r);
}
}
}
void
PresShell::RebuildApproximateFrameVisibility(nsRect* aRect,
bool aRemoveOnly /* = false */)
{
MOZ_ASSERT(!mApproximateFrameVisibilityVisited, "already visited?");
mApproximateFrameVisibilityVisited = true;
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
return;
}
AutoUpdateVisibility update(this, { VisibilityCounter::MAY_BECOME_VISIBLE });
nsRect vis(nsPoint(0, 0), rootFrame->GetSize());
if (aRect) {
vis = *aRect;
}
MarkFramesInSubtreeApproximatelyVisible(rootFrame, vis, aRemoveOnly);
}
void
PresShell::UpdateApproximateFrameVisibility()
{
DoUpdateApproximateFrameVisibility(/* aRemoveOnly = */ false);
}
void
PresShell::DoUpdateApproximateFrameVisibility(bool aRemoveOnly)
{
MOZ_ASSERT(!mPresContext || mPresContext->IsRootContentDocument(),
"Updating approximate frame visibility on a non-root content document?");
mUpdateApproximateFrameVisibilityEvent.Revoke();
if (mHaveShutDown || mIsDestroying) {
return;
}
// call update on that frame
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
ClearVisibleFramesSets(Some(OnNonvisible::DISCARD_IMAGES));
return;
}
RebuildApproximateFrameVisibility(/* aRect = */ nullptr, aRemoveOnly);
ClearVisibleFramesForUnvisitedPresShells(rootFrame->GetView(), true);
#ifdef DEBUG_FRAME_VISIBILITY_DISPLAY_LIST
// This can be used to debug the frame walker by comparing beforeFrameList
// and mVisibleFrames.mApproximate in RebuildFrameVisibilityDisplayList to
// see if they produce the same results (mVisibleFrames.mApproximate holds
// the frames the display list thinks are visible, beforeFrameList holds the
// frames the frame walker thinks are visible).
nsDisplayListBuilder builder(rootFrame, nsDisplayListBuilderMode::FRAME_VISIBILITY, false);
nsRect updateRect(nsPoint(0, 0), rootFrame->GetSize());
nsIFrame* rootScroll = GetRootScrollFrame();
if (rootScroll) {
nsIContent* content = rootScroll->GetContent();
if (content) {
Unused << nsLayoutUtils::GetDisplayPortForVisibilityTesting(content, &updateRect,
RelativeTo::ScrollFrame);
}
if (IgnoringViewportScrolling()) {
builder.SetIgnoreScrollFrame(rootScroll);
}
}
builder.IgnorePaintSuppression();
builder.EnterPresShell(rootFrame, updateRect);
nsDisplayList list;
rootFrame->BuildDisplayListForStackingContext(&builder, updateRect, &list);
builder.LeavePresShell(rootFrame, updateRect);
RebuildApproximateFrameVisibilityDisplayList(list);
ClearVisibleFramesForUnvisitedPresShells(rootFrame->GetView(), true);
list.DeleteAll();
#endif
}
bool
PresShell::AssumeAllFramesVisible()
{
static bool sFrameVisibilityEnabled = true;
static bool sFrameVisibilityPrefCached = false;
if (!sFrameVisibilityPrefCached) {
Preferences::AddBoolVarCache(&sFrameVisibilityEnabled,
"layout.framevisibility.enabled", true);
sFrameVisibilityPrefCached = true;
}
if (!sFrameVisibilityEnabled || !mPresContext || !mDocument) {
return true;
}
// We assume all frames are visible in print, print preview, chrome, 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()) {
return true;
}
// If we're assuming all frames are visible in the top level content
// document, we need to in subdocuments as well. Otherwise we can get in a
// situation where things like animations won't work in subdocuments because
// their frames appear not to be visible, since we won't schedule an image
// visibility update if the top level content document is assuming all
// frames are visible.
//
// Note that it's not safe to call IsRootContentDocument() if we're
// currently being destroyed, so we have to check that first.
if (!mHaveShutDown && !mIsDestroying &&
!mPresContext->IsRootContentDocument()) {
nsPresContext* presContext =
mPresContext->GetToplevelContentDocumentPresContext();
if (presContext && presContext->PresShell()->AssumeAllFramesVisible()) {
return true;
}
}
return false;
}
void
PresShell::ScheduleApproximateFrameVisibilityUpdateSoon()
{
if (AssumeAllFramesVisible()) {
return;
}
if (!mPresContext) {
return;
}
nsRefreshDriver* refreshDriver = mPresContext->RefreshDriver();
if (!refreshDriver) {
return;
}
// Ask the refresh driver to update frame visibility soon.
refreshDriver->ScheduleFrameVisibilityUpdate();
}
void
PresShell::ScheduleApproximateFrameVisibilityUpdateNow()
{
if (AssumeAllFramesVisible()) {
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()->ScheduleApproximateFrameVisibilityUpdateNow();
return;
}
if (mHaveShutDown || mIsDestroying) {
return;
}
if (mUpdateApproximateFrameVisibilityEvent.IsPending()) {
return;
}
RefPtr<nsRunnableMethod<PresShell> > ev =
NewRunnableMethod(this, &PresShell::UpdateApproximateFrameVisibility);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
mUpdateApproximateFrameVisibilityEvent = ev;
}
}
void
PresShell::MarkFrameVisible(nsIFrame* aFrame, VisibilityCounter aCounter)
{
MOZ_ASSERT(aCounter != VisibilityCounter::MAY_BECOME_VISIBLE,
"MAY_BECOME_VISIBLE should only be managed from within PresShell");
if (!aFrame->TrackingVisibility()) {
return;
}
if (AssumeAllFramesVisible()) {
// Force to maximum visibility (IN_DISPLAYPORT) regardless of aCounter's value.
if (aFrame->GetVisibility() != Visibility::IN_DISPLAYPORT) {
aFrame->IncVisibilityCount(VisibilityCounter::IN_DISPLAYPORT);
}
return;
}
#ifdef DEBUG
// Make sure it's in this pres shell.
nsCOMPtr<nsIContent> content = aFrame->GetContent();
if (content) {
PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
MOZ_ASSERT(!shell || shell == this, "wrong shell");
}
#endif
mVisibleFrames.AddFrame(aFrame, aCounter);
AddFrameToVisibleRegions(aFrame, aCounter);
}
void
PresShell::MarkFrameNonvisible(nsIFrame* aFrame)
{
#ifdef DEBUG
// Make sure it's in this pres shell.
nsCOMPtr<nsIContent> content = aFrame->GetContent();
if (content) {
PresShell* shell = static_cast<PresShell*></ 