mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/layout/base/RestyleManagerBase.cpp

1372 строки
54 KiB
C++
Исходник Ответственный История

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/RestyleManagerBase.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "nsIFrame.h"
namespace mozilla {
RestyleManagerBase::RestyleManagerBase(nsPresContext* aPresContext)
: mPresContext(aPresContext)
, mRestyleGeneration(1)
, mHoverGeneration(0)
, mObservingRefreshDriver(false)
, mInStyleRefresh(false)
{
MOZ_ASSERT(mPresContext);
}
/**
* Calculates the change hint and the restyle hint for a given content state
* change.
*
* This is called from both Restyle managers.
*/
void
RestyleManagerBase::ContentStateChangedInternal(Element* aElement,
EventStates aStateMask,
nsChangeHint* aOutChangeHint,
nsRestyleHint* aOutRestyleHint)
{
MOZ_ASSERT(aOutChangeHint);
MOZ_ASSERT(aOutRestyleHint);
StyleSetHandle styleSet = PresContext()->StyleSet();
NS_ASSERTION(styleSet, "couldn't get style set");
*aOutChangeHint = nsChangeHint(0);
// Any change to a content state that affects which frames we construct
// must lead to a frame reconstruct here if we already have a frame.
// Note that we never decide through non-CSS means to not create frames
// based on content states, so if we already don't have a frame we don't
// need to force a reframe -- if it's needed, the HasStateDependentStyle
// call will handle things.
nsIFrame* primaryFrame = aElement->GetPrimaryFrame();
CSSPseudoElementType pseudoType = CSSPseudoElementType::NotPseudo;
if (primaryFrame) {
// If it's generated content, ignore LOADING/etc state changes on it.
if (!primaryFrame->IsGeneratedContentFrame() &&
aStateMask.HasAtLeastOneOfStates(NS_EVENT_STATE_BROKEN |
NS_EVENT_STATE_USERDISABLED |
NS_EVENT_STATE_SUPPRESSED |
NS_EVENT_STATE_LOADING)) {
*aOutChangeHint = nsChangeHint_ReconstructFrame;
} else {
uint8_t app = primaryFrame->StyleDisplay()->mAppearance;
if (app) {
nsITheme* theme = PresContext()->GetTheme();
if (theme &&
theme->ThemeSupportsWidget(PresContext(), primaryFrame, app)) {
bool repaint = false;
theme->WidgetStateChanged(primaryFrame, app, nullptr, &repaint,
nullptr);
if (repaint) {
*aOutChangeHint |= nsChangeHint_RepaintFrame;
}
}
}
}
pseudoType = primaryFrame->StyleContext()->GetPseudoType();
primaryFrame->ContentStatesChanged(aStateMask);
}
if (pseudoType >= CSSPseudoElementType::Count) {
*aOutRestyleHint = styleSet->HasStateDependentStyle(aElement, aStateMask);
} else if (nsCSSPseudoElements::PseudoElementSupportsUserActionState(
pseudoType)) {
// If aElement is a pseudo-element, we want to check to see whether there
// are any state-dependent rules applying to that pseudo.
Element* ancestor =
ElementForStyleContext(nullptr, primaryFrame, pseudoType);
*aOutRestyleHint = styleSet->HasStateDependentStyle(ancestor, pseudoType,
aElement, aStateMask);
} else {
*aOutRestyleHint = nsRestyleHint(0);
}
if (aStateMask.HasState(NS_EVENT_STATE_HOVER) && *aOutRestyleHint != 0) {
IncrementHoverGeneration();
}
if (aStateMask.HasState(NS_EVENT_STATE_VISITED)) {
// Exposing information to the page about whether the link is
// visited or not isn't really something we can worry about here.
// FIXME: We could probably do this a bit better.
*aOutChangeHint |= nsChangeHint_RepaintFrame;
}
}
/* static */ nsCString
RestyleManagerBase::RestyleHintToString(nsRestyleHint aHint)
{
nsCString result;
bool any = false;
const char* names[] = {
"Self", "SomeDescendants", "Subtree", "LaterSiblings", "CSSTransitions",
"CSSAnimations", "SVGAttrAnimations", "StyleAttribute",
"StyleAttribute_Animations", "Force", "ForceDescendants"
};
uint32_t hint = aHint & ((1 << ArrayLength(names)) - 1);
uint32_t rest = aHint & ~((1 << ArrayLength(names)) - 1);
for (uint32_t i = 0; i < ArrayLength(names); i++) {
if (hint & (1 << i)) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("eRestyle_%s", names[i]);
any = true;
}
}
if (rest) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("0x%0x", rest);
} else {
if (!any) {
result.AppendLiteral("0");
}
}
return result;
}
#ifdef DEBUG
/* static */ nsCString
RestyleManagerBase::ChangeHintToString(nsChangeHint aHint)
{
nsCString result;
bool any = false;
const char* names[] = {
"RepaintFrame", "NeedReflow", "ClearAncestorIntrinsics",
"ClearDescendantIntrinsics", "NeedDirtyReflow", "SyncFrameView",
"UpdateCursor", "UpdateEffects", "UpdateOpacityLayer",
"UpdateTransformLayer", "ReconstructFrame", "UpdateOverflow",
"UpdateSubtreeOverflow", "UpdatePostTransformOverflow",
"UpdateParentOverflow",
"ChildrenOnlyTransform", "RecomputePosition", "AddOrRemoveTransform",
"BorderStyleNoneChange", "UpdateTextPath", "SchedulePaint",
"NeutralChange", "InvalidateRenderingObservers",
"ReflowChangesSizeOrPosition", "UpdateComputedBSize",
"UpdateUsesOpacity", "UpdateBackgroundPosition",
"AddOrRemoveTransform"
};
static_assert(nsChangeHint_AllHints == (1 << ArrayLength(names)) - 1,
"Name list doesn't match change hints.");
uint32_t hint = aHint & ((1 << ArrayLength(names)) - 1);
uint32_t rest = aHint & ~((1 << ArrayLength(names)) - 1);
if (hint == nsChangeHint_Hints_NotHandledForDescendants) {
result.AppendLiteral("nsChangeHint_Hints_NotHandledForDescendants");
hint = 0;
any = true;
} else {
if ((hint & NS_STYLE_HINT_REFLOW) == NS_STYLE_HINT_REFLOW) {
result.AppendLiteral("NS_STYLE_HINT_REFLOW");
hint = hint & ~NS_STYLE_HINT_REFLOW;
any = true;
} else if ((hint & nsChangeHint_AllReflowHints) == nsChangeHint_AllReflowHints) {
result.AppendLiteral("nsChangeHint_AllReflowHints");
hint = hint & ~nsChangeHint_AllReflowHints;
any = true;
} else if ((hint & NS_STYLE_HINT_VISUAL) == NS_STYLE_HINT_VISUAL) {
result.AppendLiteral("NS_STYLE_HINT_VISUAL");
hint = hint & ~NS_STYLE_HINT_VISUAL;
any = true;
}
}
for (uint32_t i = 0; i < ArrayLength(names); i++) {
if (hint & (1 << i)) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("nsChangeHint_%s", names[i]);
any = true;
}
}
if (rest) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("0x%0x", rest);
} else {
if (!any) {
result.AppendLiteral("nsChangeHint(0)");
}
}
return result;
}
#endif
void
RestyleManagerBase::PostRestyleEventInternal(bool aForLazyConstruction)
{
// Make sure we're not in a style refresh; if we are, we still have
// a call to ProcessPendingRestyles coming and there's no need to
// add ourselves as a refresh observer until then.
bool inRefresh = !aForLazyConstruction && mInStyleRefresh;
nsIPresShell* presShell = PresContext()->PresShell();
if (!ObservingRefreshDriver() && !inRefresh) {
SetObservingRefreshDriver(PresContext()->RefreshDriver()->
AddStyleFlushObserver(presShell));
}
// Unconditionally flag our document as needing a flush. The other
// option here would be a dedicated boolean to track whether we need
// to do so (set here and unset in ProcessPendingRestyles).
presShell->GetDocument()->SetNeedStyleFlush();
}
/**
* Frame construction helpers follow.
*/
#ifdef DEBUG
static bool gInApplyRenderingChangeToTree = false;
#endif
#ifdef DEBUG
static void
DumpContext(nsIFrame* aFrame, nsStyleContext* aContext)
{
if (aFrame) {
fputs("frame: ", stdout);
nsAutoString name;
aFrame->GetFrameName(name);
fputs(NS_LossyConvertUTF16toASCII(name).get(), stdout);
fprintf(stdout, " (%p)", static_cast<void*>(aFrame));
}
if (aContext) {
fprintf(stdout, " style: %p ", static_cast<void*>(aContext));
nsIAtom* pseudoTag = aContext->GetPseudo();
if (pseudoTag) {
nsAutoString buffer;
pseudoTag->ToString(buffer);
fputs(NS_LossyConvertUTF16toASCII(buffer).get(), stdout);
fputs(" ", stdout);
}
fputs("{}\n", stdout);
}
}
static void
VerifySameTree(nsStyleContext* aContext1, nsStyleContext* aContext2)
{
nsStyleContext* top1 = aContext1;
nsStyleContext* top2 = aContext2;
nsStyleContext* parent;
for (;;) {
parent = top1->GetParent();
if (!parent)
break;
top1 = parent;
}
for (;;) {
parent = top2->GetParent();
if (!parent)
break;
top2 = parent;
}
NS_ASSERTION(top1 == top2,
"Style contexts are not in the same style context tree");
}
static void
VerifyContextParent(nsIFrame* aFrame, nsStyleContext* aContext,
nsStyleContext* aParentContext)
{
// get the contexts not provided
if (!aContext) {
aContext = aFrame->StyleContext();
}
if (!aParentContext) {
nsIFrame* providerFrame;
aParentContext = aFrame->GetParentStyleContext(&providerFrame);
// aParentContext could still be null
}
NS_ASSERTION(aContext, "Failure to get required contexts");
nsStyleContext* actualParentContext = aContext->GetParent();
if (aParentContext) {
if (aParentContext != actualParentContext) {
DumpContext(aFrame, aContext);
if (aContext == aParentContext) {
NS_ERROR("Using parent's style context");
} else {
NS_ERROR("Wrong parent style context");
fputs("Wrong parent style context: ", stdout);
DumpContext(nullptr, actualParentContext);
fputs("should be using: ", stdout);
DumpContext(nullptr, aParentContext);
VerifySameTree(actualParentContext, aParentContext);
fputs("\n", stdout);
}
}
} else {
if (actualParentContext) {
NS_ERROR("Have parent context and shouldn't");
DumpContext(aFrame, aContext);
fputs("Has parent context: ", stdout);
DumpContext(nullptr, actualParentContext);
fputs("Should be null\n\n", stdout);
}
}
nsStyleContext* childStyleIfVisited = aContext->GetStyleIfVisited();
// Either childStyleIfVisited has aContext->GetParent()->GetStyleIfVisited()
// as the parent or it has a different rulenode from aContext _and_ has
// aContext->GetParent() as the parent.
if (childStyleIfVisited &&
!((childStyleIfVisited->RuleNode() != aContext->RuleNode() &&
childStyleIfVisited->GetParent() == aContext->GetParent()) ||
childStyleIfVisited->GetParent() ==
aContext->GetParent()->GetStyleIfVisited())) {
NS_ERROR("Visited style has wrong parent");
DumpContext(aFrame, aContext);
fputs("\n", stdout);
}
}
static void
VerifyStyleTree(nsIFrame* aFrame)
{
nsStyleContext* context = aFrame->StyleContext();
VerifyContextParent(aFrame, context, nullptr);
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
for (nsIFrame* child : lists.CurrentList()) {
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow
if (nsGkAtoms::placeholderFrame == child->GetType()) {
// placeholder: first recurse and verify the out of flow frame,
// then verify the placeholder's context
nsIFrame* outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(child);
// recurse to out of flow frame, letting the parent context get resolved
do {
VerifyStyleTree(outOfFlowFrame);
} while ((outOfFlowFrame = outOfFlowFrame->GetNextContinuation()));
// verify placeholder using the parent frame's context as
// parent context
VerifyContextParent(child, nullptr, nullptr);
} else { // regular frame
VerifyStyleTree(child);
}
}
}
}
// do additional contexts
int32_t contextIndex = 0;
for (nsStyleContext* extraContext;
(extraContext = aFrame->GetAdditionalStyleContext(contextIndex));
++contextIndex) {
VerifyContextParent(aFrame, extraContext, context);
}
}
void
RestyleManagerBase::DebugVerifyStyleTree(nsIFrame* aFrame)
{
if (aFrame) {
VerifyStyleTree(aFrame);
}
}
#endif // DEBUG
NS_DECLARE_FRAME_PROPERTY_SMALL_VALUE(ChangeListProperty, bool)
/**
* Sync views on aFrame and all of aFrame's descendants (following placeholders),
* if aChange has nsChangeHint_SyncFrameView.
* Calls DoApplyRenderingChangeToTree on all aFrame's out-of-flow descendants
* (following placeholders), if aChange has nsChangeHint_RepaintFrame.
* aFrame should be some combination of nsChangeHint_SyncFrameView,
* nsChangeHint_RepaintFrame, nsChangeHint_UpdateOpacityLayer and
* nsChangeHint_SchedulePaint, nothing else.
*/
static void SyncViewsAndInvalidateDescendants(nsIFrame* aFrame,
nsChangeHint aChange);
static void StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint);
/**
* To handle nsChangeHint_ChildrenOnlyTransform we must iterate over the child
* frames of the SVG frame concerned. This helper function is used to find that
* SVG frame when we encounter nsChangeHint_ChildrenOnlyTransform to ensure
* that we iterate over the intended children, since sometimes we end up
* handling that hint while processing hints for one of the SVG frame's
* ancestor frames.
*
* The reason that we sometimes end up trying to process the hint for an
* ancestor of the SVG frame that the hint is intended for is due to the way we
* process restyle events. ApplyRenderingChangeToTree adjusts the frame from
* the restyled element's principle frame to one of its ancestor frames based
* on what nsCSSRendering::FindBackground returns, since the background style
* may have been propagated up to an ancestor frame. Processing hints using an
* ancestor frame is fine in general, but nsChangeHint_ChildrenOnlyTransform is
* a special case since it is intended to update the children of a specific
* frame.
*/
static nsIFrame*
GetFrameForChildrenOnlyTransformHint(nsIFrame* aFrame)
{
if (aFrame->GetType() == nsGkAtoms::viewportFrame) {
// This happens if the root-<svg> is fixed positioned, in which case we
// can't use aFrame->GetContent() to find the primary frame, since
// GetContent() returns nullptr for ViewportFrame.
aFrame = aFrame->PrincipalChildList().FirstChild();
}
// For an nsHTMLScrollFrame, this will get the SVG frame that has the
// children-only transforms:
aFrame = aFrame->GetContent()->GetPrimaryFrame();
if (aFrame->GetType() == nsGkAtoms::svgOuterSVGFrame) {
aFrame = aFrame->PrincipalChildList().FirstChild();
MOZ_ASSERT(aFrame->GetType() == nsGkAtoms::svgOuterSVGAnonChildFrame,
"Where is the nsSVGOuterSVGFrame's anon child??");
}
MOZ_ASSERT(aFrame->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer),
"Children-only transforms only expected on SVG frames");
return aFrame;
}
// Returns true if this function managed to successfully move a frame, and
// false if it could not process the position change, and a reflow should
// be performed instead.
bool
RecomputePosition(nsIFrame* aFrame)
{
// Don't process position changes on table frames, since we already handle
// the dynamic position change on the table wrapper frame, and the
// reflow-based fallback code path also ignores positions on inner table
// frames.
if (aFrame->GetType() == nsGkAtoms::tableFrame) {
return true;
}
const nsStyleDisplay* display = aFrame->StyleDisplay();
// Changes to the offsets of a non-positioned element can safely be ignored.
if (display->mPosition == NS_STYLE_POSITION_STATIC) {
return true;
}
// Don't process position changes on frames which have views or the ones which
// have a view somewhere in their descendants, because the corresponding view
// needs to be repositioned properly as well.
if (aFrame->HasView() ||
(aFrame->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)) {
StyleChangeReflow(aFrame, nsChangeHint_NeedReflow);
return false;
}
aFrame->SchedulePaint();
// For relative positioning, we can simply update the frame rect
if (display->IsRelativelyPositionedStyle()) {
// Move the frame
if (display->mPosition == NS_STYLE_POSITION_STICKY) {
if (display->IsInnerTableStyle()) {
// We don't currently support sticky positioning of inner table
// elements (bug 975644). Bail.
//
// When this is fixed, remove the null-check for the computed
// offsets in nsTableRowFrame::ReflowChildren.
return true;
}
// Update sticky positioning for an entire element at once, starting with
// the first continuation or ib-split sibling.
// It's rare that the frame we already have isn't already the first
// continuation or ib-split sibling, but it can happen when styles differ
// across continuations such as ::first-line or ::first-letter, and in
// those cases we will generally (but maybe not always) do the work twice.
nsIFrame* firstContinuation =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
StickyScrollContainer::ComputeStickyOffsets(firstContinuation);
StickyScrollContainer* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(
firstContinuation);
if (ssc) {
ssc->PositionContinuations(firstContinuation);
}
} else {
MOZ_ASSERT(NS_STYLE_POSITION_RELATIVE == display->mPosition,
"Unexpected type of positioning");
for (nsIFrame* cont = aFrame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
nsIFrame* cb = cont->GetContainingBlock();
nsMargin newOffsets;
WritingMode wm = cb->GetWritingMode();
const LogicalSize size(wm, cb->GetContentRectRelativeToSelf().Size());
ReflowInput::ComputeRelativeOffsets(wm, cont, size, newOffsets);
NS_ASSERTION(newOffsets.left == -newOffsets.right &&
newOffsets.top == -newOffsets.bottom,
"ComputeRelativeOffsets should return valid results");
// ReflowInput::ApplyRelativePositioning would work here, but
// since we've already checked mPosition and aren't changing the frame's
// normal position, go ahead and add the offsets directly.
// First, we need to ensure that the normal position is stored though.
nsPoint normalPosition = cont->GetNormalPosition();
auto props = cont->Properties();
const auto& prop = nsIFrame::NormalPositionProperty();
if (!props.Get(prop)) {
props.Set(prop, new nsPoint(normalPosition));
}
cont->SetPosition(normalPosition +
nsPoint(newOffsets.left, newOffsets.top));
}
}
return true;
}
// For the absolute positioning case, set up a fake HTML reflow state for
// the frame, and then get the offsets and size from it. If the frame's size
// doesn't need to change, we can simply update the frame position. Otherwise
// we fall back to a reflow.
nsRenderingContext rc(
aFrame->PresContext()->PresShell()->CreateReferenceRenderingContext());
// Construct a bogus parent reflow state so that there's a usable
// containing block reflow state.
nsIFrame* parentFrame = aFrame->GetParent();
WritingMode parentWM = parentFrame->GetWritingMode();
WritingMode frameWM = aFrame->GetWritingMode();
LogicalSize parentSize = parentFrame->GetLogicalSize();
nsFrameState savedState = parentFrame->GetStateBits();
ReflowInput parentReflowInput(aFrame->PresContext(), parentFrame, &rc,
parentSize);
parentFrame->RemoveStateBits(~nsFrameState(0));
parentFrame->AddStateBits(savedState);
// The bogus parent state here was created with no parent state of its own,
// and therefore it won't have an mCBReflowInput set up.
// But we may need one (for InitCBReflowInput in a child state), so let's
// try to create one here for the cases where it will be needed.
Maybe<ReflowInput> cbReflowInput;
nsIFrame* cbFrame = parentFrame->GetContainingBlock();
if (cbFrame && (aFrame->GetContainingBlock() != parentFrame ||
parentFrame->GetType() == nsGkAtoms::tableFrame)) {
LogicalSize cbSize = cbFrame->GetLogicalSize();
cbReflowInput.emplace(cbFrame->PresContext(), cbFrame, &rc, cbSize);
cbReflowInput->ComputedPhysicalMargin() = cbFrame->GetUsedMargin();
cbReflowInput->ComputedPhysicalPadding() = cbFrame->GetUsedPadding();
cbReflowInput->ComputedPhysicalBorderPadding() =
cbFrame->GetUsedBorderAndPadding();
parentReflowInput.mCBReflowInput = cbReflowInput.ptr();
}
NS_WARNING_ASSERTION(parentSize.ISize(parentWM) != NS_INTRINSICSIZE &&
parentSize.BSize(parentWM) != NS_INTRINSICSIZE,
"parentSize should be valid");
parentReflowInput.SetComputedISize(std::max(parentSize.ISize(parentWM), 0));
parentReflowInput.SetComputedBSize(std::max(parentSize.BSize(parentWM), 0));
parentReflowInput.ComputedPhysicalMargin().SizeTo(0, 0, 0, 0);
parentReflowInput.ComputedPhysicalPadding() = parentFrame->GetUsedPadding();
parentReflowInput.ComputedPhysicalBorderPadding() =
parentFrame->GetUsedBorderAndPadding();
LogicalSize availSize = parentSize.ConvertTo(frameWM, parentWM);
availSize.BSize(frameWM) = NS_INTRINSICSIZE;
ViewportFrame* viewport = do_QueryFrame(parentFrame);
nsSize cbSize = viewport ?
viewport->AdjustReflowInputAsContainingBlock(&parentReflowInput).Size()
: aFrame->GetContainingBlock()->GetSize();
const nsMargin& parentBorder =
parentReflowInput.mStyleBorder->GetComputedBorder();
cbSize -= nsSize(parentBorder.LeftRight(), parentBorder.TopBottom());
LogicalSize lcbSize(frameWM, cbSize);
ReflowInput reflowInput(aFrame->PresContext(), parentReflowInput, aFrame,
availSize, &lcbSize);
nsSize computedSize(reflowInput.ComputedWidth(),
reflowInput.ComputedHeight());
computedSize.width += reflowInput.ComputedPhysicalBorderPadding().LeftRight();
if (computedSize.height != NS_INTRINSICSIZE) {
computedSize.height +=
reflowInput.ComputedPhysicalBorderPadding().TopBottom();
}
nsSize size = aFrame->GetSize();
// The RecomputePosition hint is not used if any offset changed between auto
// and non-auto. If computedSize.height == NS_INTRINSICSIZE then the new
// element height will be its intrinsic height, and since 'top' and 'bottom''s
// auto-ness hasn't changed, the old height must also be its intrinsic
// height, which we can assume hasn't changed (or reflow would have
// been triggered).
if (computedSize.width == size.width &&
(computedSize.height == NS_INTRINSICSIZE || computedSize.height == size.height)) {
// If we're solving for 'left' or 'top', then compute it here, in order to
// match the reflow code path.
if (NS_AUTOOFFSET == reflowInput.ComputedPhysicalOffsets().left) {
reflowInput.ComputedPhysicalOffsets().left = cbSize.width -
reflowInput.ComputedPhysicalOffsets().right -
reflowInput.ComputedPhysicalMargin().right -
size.width -
reflowInput.ComputedPhysicalMargin().left;
}
if (NS_AUTOOFFSET == reflowInput.ComputedPhysicalOffsets().top) {
reflowInput.ComputedPhysicalOffsets().top = cbSize.height -
reflowInput.ComputedPhysicalOffsets().bottom -
reflowInput.ComputedPhysicalMargin().bottom -
size.height -
reflowInput.ComputedPhysicalMargin().top;
}
// Move the frame
nsPoint pos(parentBorder.left + reflowInput.ComputedPhysicalOffsets().left +
reflowInput.ComputedPhysicalMargin().left,
parentBorder.top + reflowInput.ComputedPhysicalOffsets().top +
reflowInput.ComputedPhysicalMargin().top);
aFrame->SetPosition(pos);
return true;
}
// Fall back to a reflow
StyleChangeReflow(aFrame, nsChangeHint_NeedReflow);
return false;
}
static bool
HasBoxAncestor(nsIFrame* aFrame)
{
for (nsIFrame* f = aFrame; f; f = f->GetParent()) {
if (f->IsXULBoxFrame()) {
return true;
}
}
return false;
}
/**
* Return true if aFrame's subtree has placeholders for out-of-flow content
* whose 'position' style's bit in aPositionMask is set.
*/
static bool
FrameHasPositionedPlaceholderDescendants(nsIFrame* aFrame,
uint32_t aPositionMask)
{
MOZ_ASSERT(aPositionMask & (1 << NS_STYLE_POSITION_FIXED));
for (nsIFrame::ChildListIterator lists(aFrame); !lists.IsDone(); lists.Next()) {
for (nsIFrame* f : lists.CurrentList()) {
if (f->GetType() == nsGkAtoms::placeholderFrame) {
nsIFrame* outOfFlow =
nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
// If SVG text frames could appear here, they could confuse us since
// they ignore their position style ... but they can't.
NS_ASSERTION(!outOfFlow->IsSVGText(),
"SVG text frames can't be out of flow");
if (aPositionMask & (1 << outOfFlow->StyleDisplay()->mPosition)) {
return true;
}
}
uint32_t positionMask = aPositionMask;
// NOTE: It's tempting to check f->IsAbsPosContainingBlock() or
// f->IsFixedPosContainingBlock() here. However, that would only
// be testing the *new* style of the frame, which might exclude
// descendants that currently have this frame as an abs-pos
// containing block. Taking the codepath where we don't reframe
// could lead to an unsafe call to
// cont->MarkAsNotAbsoluteContainingBlock() before we've reframed
// the descendant and taken it off the absolute list.
if (FrameHasPositionedPlaceholderDescendants(f, positionMask)) {
return true;
}
}
}
return false;
}
static bool
NeedToReframeForAddingOrRemovingTransform(nsIFrame* aFrame)
{
static_assert(0 <= NS_STYLE_POSITION_ABSOLUTE &&
NS_STYLE_POSITION_ABSOLUTE < 32, "Style constant out of range");
static_assert(0 <= NS_STYLE_POSITION_FIXED &&
NS_STYLE_POSITION_FIXED < 32, "Style constant out of range");
uint32_t positionMask;
// Don't call aFrame->IsPositioned here, since that returns true if
// the frame already has a transform, and we want to ignore that here
if (aFrame->IsAbsolutelyPositioned() || aFrame->IsRelativelyPositioned()) {
// This frame is a container for abs-pos descendants whether or not it
// has a transform.
// So abs-pos descendants are no problem; we only need to reframe if
// we have fixed-pos descendants.
positionMask = 1 << NS_STYLE_POSITION_FIXED;
} else {
// This frame may not be a container for abs-pos descendants already.
// So reframe if we have abs-pos or fixed-pos descendants.
positionMask =
(1 << NS_STYLE_POSITION_FIXED) | (1 << NS_STYLE_POSITION_ABSOLUTE);
}
for (nsIFrame* f = aFrame; f;
f = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(f)) {
if (FrameHasPositionedPlaceholderDescendants(f, positionMask)) {
return true;
}
}
return false;
}
/* static */ nsIFrame*
RestyleManagerBase::GetNearestAncestorFrame(nsIContent* aContent)
{
nsIFrame* ancestorFrame = nullptr;
for (nsIContent* ancestor = aContent->GetParent();
ancestor && !ancestorFrame;
ancestor = ancestor->GetParent()) {
ancestorFrame = ancestor->GetPrimaryFrame();
}
return ancestorFrame;
}
/* static */ nsIFrame*
RestyleManagerBase::GetNextBlockInInlineSibling(FramePropertyTable* aPropTable,
nsIFrame* aFrame)
{
NS_ASSERTION(!aFrame->GetPrevContinuation(),
"must start with the first continuation");
// Might we have ib-split siblings?
if (!(aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT)) {
// nothing more to do here
return nullptr;
}
return static_cast<nsIFrame*>
(aPropTable->Get(aFrame, nsIFrame::IBSplitSibling()));
}
static void
DoApplyRenderingChangeToTree(nsIFrame* aFrame,
nsChangeHint aChange)
{
NS_PRECONDITION(gInApplyRenderingChangeToTree,
"should only be called within ApplyRenderingChangeToTree");
for ( ; aFrame; aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame)) {
// Invalidate and sync views on all descendant frames, following placeholders.
// We don't need to update transforms in SyncViewsAndInvalidateDescendants, because
// there can't be any out-of-flows or popups that need to be transformed;
// all out-of-flow descendants of the transformed element must also be
// descendants of the transformed frame.
SyncViewsAndInvalidateDescendants(aFrame,
nsChangeHint(aChange & (nsChangeHint_RepaintFrame |
nsChangeHint_SyncFrameView |
nsChangeHint_UpdateOpacityLayer |
nsChangeHint_SchedulePaint)));
// This must be set to true if the rendering change needs to
// invalidate content. If it's false, a composite-only paint
// (empty transaction) will be scheduled.
bool needInvalidatingPaint = false;
// if frame has view, will already be invalidated
if (aChange & nsChangeHint_RepaintFrame) {
// Note that this whole block will be skipped when painting is suppressed
// (due to our caller ApplyRendingChangeToTree() discarding the
// nsChangeHint_RepaintFrame hint). If you add handling for any other
// hints within this block, be sure that they too should be ignored when
// painting is suppressed.
needInvalidatingPaint = true;
aFrame->InvalidateFrameSubtree();
if ((aChange & nsChangeHint_UpdateEffects) &&
aFrame->IsFrameOfType(nsIFrame::eSVG) &&
!(aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG)) {
// Need to update our overflow rects:
nsSVGUtils::ScheduleReflowSVG(aFrame);
}
}
if (aChange & nsChangeHint_UpdateTextPath) {
if (aFrame->IsSVGText()) {
// Invalidate and reflow the entire SVGTextFrame:
NS_ASSERTION(aFrame->GetContent()->IsSVGElement(nsGkAtoms::textPath),
"expected frame for a <textPath> element");
nsIFrame* text =
nsLayoutUtils::GetClosestFrameOfType(aFrame, nsGkAtoms::svgTextFrame);
NS_ASSERTION(text, "expected to find an ancestor SVGTextFrame");
static_cast<SVGTextFrame*>(text)->NotifyGlyphMetricsChange();
} else {
MOZ_ASSERT(false, "unexpected frame got nsChangeHint_UpdateTextPath");
}
}
if (aChange & nsChangeHint_UpdateOpacityLayer) {
// FIXME/bug 796697: we can get away with empty transactions for
// opacity updates in many cases.
needInvalidatingPaint = true;
ActiveLayerTracker::NotifyRestyle(aFrame, eCSSProperty_opacity);
if (nsSVGIntegrationUtils::UsingEffectsForFrame(aFrame)) {
// SVG effects paints the opacity without using
// nsDisplayOpacity. We need to invalidate manually.
aFrame->InvalidateFrameSubtree();
}
}
if ((aChange & nsChangeHint_UpdateTransformLayer) &&
aFrame->IsTransformed()) {
ActiveLayerTracker::NotifyRestyle(aFrame, eCSSProperty_transform);
// If we're not already going to do an invalidating paint, see
// if we can get away with only updating the transform on a
// layer for this frame, and not scheduling an invalidating
// paint.
if (!needInvalidatingPaint) {
Layer* layer;
needInvalidatingPaint |= !aFrame->TryUpdateTransformOnly(&layer);
if (!needInvalidatingPaint) {
// Since we're not going to paint, we need to resend animation
// data to the layer.
MOZ_ASSERT(layer, "this can't happen if there's no layer");
nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(
layer, nullptr, nullptr, aFrame, eCSSProperty_transform);
}
}
}
if (aChange & nsChangeHint_ChildrenOnlyTransform) {
needInvalidatingPaint = true;
nsIFrame* childFrame =
GetFrameForChildrenOnlyTransformHint(aFrame)->PrincipalChildList().FirstChild();
for ( ; childFrame; childFrame = childFrame->GetNextSibling()) {
ActiveLayerTracker::NotifyRestyle(childFrame, eCSSProperty_transform);
}
}
if (aChange & nsChangeHint_SchedulePaint) {
needInvalidatingPaint = true;
}
aFrame->SchedulePaint(needInvalidatingPaint
? nsIFrame::PAINT_DEFAULT
: nsIFrame::PAINT_COMPOSITE_ONLY);
}
}
static void
SyncViewsAndInvalidateDescendants(nsIFrame* aFrame, nsChangeHint aChange)
{
NS_PRECONDITION(gInApplyRenderingChangeToTree,
"should only be called within ApplyRenderingChangeToTree");
NS_ASSERTION(nsChangeHint_size_t(aChange) ==
(aChange & (nsChangeHint_RepaintFrame |
nsChangeHint_SyncFrameView |
nsChangeHint_UpdateOpacityLayer |
nsChangeHint_SchedulePaint)),
"Invalid change flag");
nsView* view = aFrame->GetView();
if (view) {
if (aChange & nsChangeHint_SyncFrameView) {
nsContainerFrame::SyncFrameViewProperties(aFrame->PresContext(), aFrame,
nullptr, view);
}
}
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
for (nsIFrame* child : lists.CurrentList()) {
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that don't have placeholders
if (nsGkAtoms::placeholderFrame == child->GetType()) {
// do the out-of-flow frame and its continuations
nsIFrame* outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(child);
DoApplyRenderingChangeToTree(outOfFlowFrame, aChange);
} else if (lists.CurrentID() == nsIFrame::kPopupList) {
DoApplyRenderingChangeToTree(child, aChange);
} else { // regular frame
SyncViewsAndInvalidateDescendants(child, aChange);
}
}
}
}
}
static void
ApplyRenderingChangeToTree(nsIPresShell* aPresShell,
nsIFrame* aFrame,
nsChangeHint aChange)
{
// We check StyleDisplay()->HasTransformStyle() in addition to checking
// IsTransformed() since we can get here for some frames that don't support
// CSS transforms.
NS_ASSERTION(!(aChange & nsChangeHint_UpdateTransformLayer) ||
aFrame->IsTransformed() ||
aFrame->StyleDisplay()->HasTransformStyle(),
"Unexpected UpdateTransformLayer hint");
if (aPresShell->IsPaintingSuppressed()) {
// Don't allow synchronous rendering changes when painting is turned off.
aChange &= ~nsChangeHint_RepaintFrame;
if (!aChange) {
return;
}
}
// Trigger rendering updates by damaging this frame and any
// continuations of this frame.
#ifdef DEBUG
gInApplyRenderingChangeToTree = true;
#endif
if (aChange & nsChangeHint_RepaintFrame) {
// If the frame's background is propagated to an ancestor, walk up to
// that ancestor and apply the RepaintFrame change hint to it.
nsStyleContext* bgSC;
nsIFrame* propagatedFrame = aFrame;
while (!nsCSSRendering::FindBackground(propagatedFrame, &bgSC)) {
propagatedFrame = propagatedFrame->GetParent();
NS_ASSERTION(aFrame, "root frame must paint");
}
if (propagatedFrame != aFrame) {
DoApplyRenderingChangeToTree(propagatedFrame, nsChangeHint_RepaintFrame);
aChange &= ~nsChangeHint_RepaintFrame;
if (!aChange) {
return;
}
}
}
DoApplyRenderingChangeToTree(aFrame, aChange);
#ifdef DEBUG
gInApplyRenderingChangeToTree = false;
#endif
}
static void
AddSubtreeToOverflowTracker(nsIFrame* aFrame,
OverflowChangedTracker& aOverflowChangedTracker)
{
if (aFrame->FrameMaintainsOverflow()) {
aOverflowChangedTracker.AddFrame(aFrame,
OverflowChangedTracker::CHILDREN_CHANGED);
}
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
for (nsIFrame* child : lists.CurrentList()) {
AddSubtreeToOverflowTracker(child, aOverflowChangedTracker);
}
}
}
static void
StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint)
{
nsIPresShell::IntrinsicDirty dirtyType;
if (aHint & nsChangeHint_ClearDescendantIntrinsics) {
NS_ASSERTION(aHint & nsChangeHint_ClearAncestorIntrinsics,
"Please read the comments in nsChangeHint.h");
NS_ASSERTION(aHint & nsChangeHint_NeedDirtyReflow,
"ClearDescendantIntrinsics requires NeedDirtyReflow");
dirtyType = nsIPresShell::eStyleChange;
} else if ((aHint & nsChangeHint_UpdateComputedBSize) &&
aFrame->HasAnyStateBits(
NS_FRAME_DESCENDANT_INTRINSIC_ISIZE_DEPENDS_ON_BSIZE)) {
dirtyType = nsIPresShell::eStyleChange;
} else if (aHint & nsChangeHint_ClearAncestorIntrinsics) {
dirtyType = nsIPresShell::eTreeChange;
} else if ((aHint & nsChangeHint_UpdateComputedBSize) &&
HasBoxAncestor(aFrame)) {
// The frame's computed BSize is changing, and we have a box ancestor
// whose cached intrinsic height may need to be updated.
dirtyType = nsIPresShell::eTreeChange;
} else {
dirtyType = nsIPresShell::eResize;
}
nsFrameState dirtyBits;
if (aFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) {
dirtyBits = nsFrameState(0);
} else if ((aHint & nsChangeHint_NeedDirtyReflow) ||
dirtyType == nsIPresShell::eStyleChange) {
dirtyBits = NS_FRAME_IS_DIRTY;
} else {
dirtyBits = NS_FRAME_HAS_DIRTY_CHILDREN;
}
// If we're not going to clear any intrinsic sizes on the frames, and
// there are no dirty bits to set, then there's nothing to do.
if (dirtyType == nsIPresShell::eResize && !dirtyBits)
return;
nsIPresShell::ReflowRootHandling rootHandling;
if (aHint & nsChangeHint_ReflowChangesSizeOrPosition) {
rootHandling = nsIPresShell::ePositionOrSizeChange;
} else {
rootHandling = nsIPresShell::eNoPositionOrSizeChange;
}
do {
aFrame->PresContext()->PresShell()->FrameNeedsReflow(
aFrame, dirtyType, dirtyBits, rootHandling);
aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame);
} while (aFrame);
}
/* static */ nsIFrame*
RestyleManagerBase::GetNextContinuationWithSameStyle(
nsIFrame* aFrame, nsStyleContext* aOldStyleContext,
bool* aHaveMoreContinuations)
{
// See GetPrevContinuationWithSameStyle about {ib} splits.
nsIFrame* nextContinuation = aFrame->GetNextContinuation();
if (!nextContinuation &&
(aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT)) {
// We're the last continuation, so we have to hop back to the first
// before getting the frame property
nextContinuation =
aFrame->FirstContinuation()->Properties().Get(nsIFrame::IBSplitSibling());
if (nextContinuation) {
nextContinuation =
nextContinuation->Properties().Get(nsIFrame::IBSplitSibling());
}
}
if (!nextContinuation) {
return nullptr;
}
NS_ASSERTION(nextContinuation->GetContent() == aFrame->GetContent(),
"unexpected content mismatch");
nsStyleContext* nextStyle = nextContinuation->StyleContext();
if (nextStyle != aOldStyleContext) {
NS_ASSERTION(aOldStyleContext->GetPseudo() != nextStyle->GetPseudo() ||
aOldStyleContext->GetParent() != nextStyle->GetParent(),
"continuations should have the same style context");
nextContinuation = nullptr;
if (aHaveMoreContinuations) {
*aHaveMoreContinuations = true;
}
}
return nextContinuation;
}
nsresult
RestyleManagerBase::ProcessRestyledFrames(nsStyleChangeList& aChangeList)
{
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"Someone forgot a script blocker");
if (aChangeList.IsEmpty())
return NS_OK;
PROFILER_LABEL("RestyleManager", "ProcessRestyledFrames",
js::ProfileEntry::Category::CSS);
nsPresContext* presContext = PresContext();
FramePropertyTable* propTable = presContext->PropertyTable();
nsCSSFrameConstructor* frameConstructor = presContext->FrameConstructor();
// Make sure to not rebuild quote or counter lists while we're
// processing restyles
frameConstructor->BeginUpdate();
// Mark frames so that we skip frames that die along the way, bug 123049.
// A frame can be in the list multiple times with different hints. Further
// optmization is possible if nsStyleChangeList::AppendChange could coalesce
for (const nsStyleChangeData& data : aChangeList) {
if (data.mFrame) {
propTable->Set(data.mFrame, ChangeListProperty(), true);
}
}
bool didUpdateCursor = false;
for (const nsStyleChangeData& data : aChangeList) {
nsIFrame* frame = data.mFrame;
nsIContent* content = data.mContent;
nsChangeHint hint = data.mHint;
bool didReflowThisFrame = false;
NS_ASSERTION(!(hint & nsChangeHint_AllReflowHints) ||
(hint & nsChangeHint_NeedReflow),
"Reflow hint bits set without actually asking for a reflow");
// skip any frame that has been destroyed due to a ripple effect
if (frame && !propTable->Get(frame, ChangeListProperty())) {
continue;
}
if (frame && frame->GetContent() != content) {
// XXXbz this is due to image maps messing with the primary frame of
// <area>s. See bug 135040. Remove this block once that's fixed.
frame = nullptr;
if (!(hint & nsChangeHint_ReconstructFrame)) {
continue;
}
}
if ((hint & nsChangeHint_UpdateContainingBlock) && frame &&
!(hint & nsChangeHint_ReconstructFrame)) {
if (NeedToReframeForAddingOrRemovingTransform(frame) ||
frame->GetType() == nsGkAtoms::fieldSetFrame ||
frame->GetContentInsertionFrame() != frame) {
// The frame has positioned children that need to be reparented, or
// it can't easily be converted to/from being an abs-pos container correctly.
hint |= nsChangeHint_ReconstructFrame;
} else {
for (nsIFrame* cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
// Normally frame construction would set state bits as needed,
// but we're not going to reconstruct the frame so we need to set them.
// It's because we need to set this state on each affected frame
// that we can't coalesce nsChangeHint_UpdateContainingBlock hints up
// to ancestors (i.e. it can't be an change hint that is handled for
// descendants).
if (cont->IsAbsPosContainingBlock()) {
if (!cont->IsAbsoluteContainer() &&
(cont->GetStateBits() & NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) {
cont->MarkAsAbsoluteContainingBlock();
}
} else {
if (cont->IsAbsoluteContainer()) {
if (cont->HasAbsolutelyPositionedChildren()) {
// If |cont| still has absolutely positioned children,
// we can't call MarkAsNotAbsoluteContainingBlock. This
// will remove a frame list that still has children in
// it that we need to keep track of.
// The optimization of removing it isn't particularly
// important, although it does mean we skip some tests.
NS_WARNING("skipping removal of absolute containing block");
} else {
cont->MarkAsNotAbsoluteContainingBlock();
}
}
}
}
}
}
if ((hint & nsChangeHint_AddOrRemoveTransform) && frame &&
!(hint & nsChangeHint_ReconstructFrame)) {
for (nsIFrame* cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
if (cont->StyleDisplay()->HasTransform(cont)) {
cont->AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
}
// Don't remove NS_FRAME_MAY_BE_TRANSFORMED since it may still be
// transformed by other means. It's OK to have the bit even if it's
// not needed.
}
}
if (hint & nsChangeHint_ReconstructFrame) {
// If we ever start passing true here, be careful of restyles
// that involve a reframe and animations. In particular, if the
// restyle we're processing here is an animation restyle, but
// the style resolution we will do for the frame construction
// happens async when we're not in an animation restyle already,
// problems could arise.
// We could also have problems with triggering of CSS transitions
// on elements whose frames are reconstructed, since we depend on
// the reconstruction happening synchronously.
frameConstructor->RecreateFramesForContent(content, false,
nsCSSFrameConstructor::REMOVE_FOR_RECONSTRUCTION, nullptr);
} else {
NS_ASSERTION(frame, "This shouldn't happen");
if (!frame->FrameMaintainsOverflow()) {
// frame does not maintain overflow rects, so avoid calling
// FinishAndStoreOverflow on it:
hint &= ~(nsChangeHint_UpdateOverflow |
nsChangeHint_ChildrenOnlyTransform |
nsChangeHint_UpdatePostTransformOverflow |
nsChangeHint_UpdateParentOverflow);
}
if (!(frame->GetStateBits() & NS_FRAME_MAY_BE_TRANSFORMED)) {
// Frame can not be transformed, and thus a change in transform will
// have no effect and we should not use the
// nsChangeHint_UpdatePostTransformOverflow hint.
hint &= ~nsChangeHint_UpdatePostTransformOverflow;
}
if (hint & nsChangeHint_UpdateEffects) {
for (nsIFrame* cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
nsSVGEffects::UpdateEffects(cont);
}
}
if ((hint & nsChangeHint_InvalidateRenderingObservers) ||
((hint & nsChangeHint_UpdateOpacityLayer) &&
frame->IsFrameOfType(nsIFrame::eSVG) &&
!(frame->GetStateBits() & NS_STATE_IS_OUTER_SVG))) {
nsSVGEffects::InvalidateRenderingObservers(frame);
}
if (hint & nsChangeHint_NeedReflow) {
StyleChangeReflow(frame, hint);
didReflowThisFrame = true;
}
if ((hint & nsChangeHint_UpdateUsesOpacity) &&
frame->IsFrameOfType(nsIFrame::eTablePart)) {
NS_ASSERTION(hint & nsChangeHint_UpdateOpacityLayer,
"should only return UpdateUsesOpacity hint "
"when also returning UpdateOpacityLayer hint");
// When an internal table part (including cells) changes between
// having opacity 1 and non-1, it changes whether its
// backgrounds (and those of table parts inside of it) are
// painted as part of the table's nsDisplayTableBorderBackground
// display item, or part of its own display item. That requires
// invalidation, so change UpdateOpacityLayer to RepaintFrame.
hint &= ~nsChangeHint_UpdateOpacityLayer;
hint |= nsChangeHint_RepaintFrame;
}
if (hint & nsChangeHint_UpdateBackgroundPosition) {
// For most frame types, DLBI can detect background position changes,
// so we only need to schedule a paint.
hint |= nsChangeHint_SchedulePaint;
if (frame->IsFrameOfType(nsIFrame::eTablePart) ||
frame->IsFrameOfType(nsIFrame::eMathML)) {
// Table parts and MathML frames don't build display items for their
// backgrounds, so DLBI can't detect background-position changes for
// these frames. Repaint the whole frame.
hint |= nsChangeHint_RepaintFrame;
}
}
if (hint & (nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView |
nsChangeHint_UpdateOpacityLayer | nsChangeHint_UpdateTransformLayer |
nsChangeHint_ChildrenOnlyTransform | nsChangeHint_SchedulePaint)) {
ApplyRenderingChangeToTree(presContext->PresShell(), frame, hint);
}
if ((hint & nsChangeHint_RecomputePosition) && !didReflowThisFrame) {
ActiveLayerTracker::NotifyOffsetRestyle(frame);
// It is possible for this to fall back to a reflow
if (!RecomputePosition(frame)) {
didReflowThisFrame = true;
}
}
NS_ASSERTION(!(hint & nsChangeHint_ChildrenOnlyTransform) ||
(hint & nsChangeHint_UpdateOverflow),
"nsChangeHint_UpdateOverflow should be passed too");
if (!didReflowThisFrame &&
(hint & (nsChangeHint_UpdateOverflow |
nsChangeHint_UpdatePostTransformOverflow |
nsChangeHint_UpdateParentOverflow |
nsChangeHint_UpdateSubtreeOverflow))) {
if (hint & nsChangeHint_UpdateSubtreeOverflow) {
for (nsIFrame* cont = frame; cont; cont =
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
AddSubtreeToOverflowTracker(cont, mOverflowChangedTracker);
}
// The work we just did in AddSubtreeToOverflowTracker
// subsumes some of the other hints:
hint &= ~(nsChangeHint_UpdateOverflow |
nsChangeHint_UpdatePostTransformOverflow);
}
if (hint & nsChangeHint_ChildrenOnlyTransform) {
// The overflow areas of the child frames need to be updated:
nsIFrame* hintFrame = GetFrameForChildrenOnlyTransformHint(frame);
nsIFrame* childFrame = hintFrame->PrincipalChildList().FirstChild();
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrIBSplitSibling(frame),
"SVG frames should not have continuations "
"or ib-split siblings");
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrIBSplitSibling(hintFrame),
"SVG frames should not have continuations "
"or ib-split siblings");
for ( ; childFrame; childFrame = childFrame->GetNextSibling()) {
MOZ_ASSERT(childFrame->IsFrameOfType(nsIFrame::eSVG),
"Not expecting non-SVG children");
// If |childFrame| is dirty or has dirty children, we don't bother
// updating overflows since that will happen when it's reflowed.
if (!(childFrame->GetStateBits() &
(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN))) {
mOverflowChangedTracker.AddFrame(childFrame,
OverflowChangedTracker::CHILDREN_CHANGED);
}
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrIBSplitSibling(childFrame),
"SVG frames should not have continuations "
"or ib-split siblings");
NS_ASSERTION(childFrame->GetParent() == hintFrame,
"SVG child frame not expected to have different parent");
}
}
// If |frame| is dirty or has dirty children, we don't bother updating
// overflows since that will happen when it's reflowed.
if (!(frame->GetStateBits() &
(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN))) {
if (hint & (nsChangeHint_UpdateOverflow |
nsChangeHint_UpdatePostTransformOverflow)) {
OverflowChangedTracker::ChangeKind changeKind;
// If we have both nsChangeHint_UpdateOverflow and
// nsChangeHint_UpdatePostTransformOverflow,
// CHILDREN_CHANGED is selected as it is
// strictly stronger.
if (hint & nsChangeHint_UpdateOverflow) {
changeKind = OverflowChangedTracker::CHILDREN_CHANGED;
} else {
changeKind = OverflowChangedTracker::TRANSFORM_CHANGED;
}
for (nsIFrame* cont = frame; cont; cont =
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
mOverflowChangedTracker.AddFrame(cont, changeKind);
}
}
// UpdateParentOverflow hints need to be processed in addition
// to the above, since if the processing of the above hints
// yields no change, the update will not propagate to the
// parent.
if (hint & nsChangeHint_UpdateParentOverflow) {
MOZ_ASSERT(frame->GetParent(),
"shouldn't get style hints for the root frame");
for (nsIFrame* cont = frame; cont; cont =
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
mOverflowChangedTracker.AddFrame(cont->GetParent(),
OverflowChangedTracker::CHILDREN_CHANGED);
}
}
}
}
if ((hint & nsChangeHint_UpdateCursor) && !didUpdateCursor) {
presContext->PresShell()->SynthesizeMouseMove(false);
didUpdateCursor = true;
}
}
}
frameConstructor->EndUpdate();
// cleanup references and verify the style tree. Note that the latter needs
// to happen once we've processed the whole list, since until then the tree
// is not in fact in a consistent state.
for (const nsStyleChangeData& data : aChangeList) {
if (data.mFrame) {
propTable->Delete(data.mFrame, ChangeListProperty());
}
#ifdef DEBUG
// reget frame from content since it may have been regenerated...
if (data.mContent) {
nsIFrame* frame = data.mContent->GetPrimaryFrame();
if (frame) {
DebugVerifyStyleTree(frame);
}
} else if (!data.mFrame ||
data.mFrame->GetType() != nsGkAtoms::viewportFrame) {
NS_WARNING("Unable to test style tree integrity -- no content node "
"(and not a viewport frame)");
}
#endif
}
aChangeList.Clear();
return NS_OK;
}
} // namespace mozilla
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку