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gecko-dev/layout/base/RestyleManager.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/**
* Code responsible for managing style changes: tracking what style
* changes need to happen, scheduling them, and doing them.
*/
#include "RestyleManager.h"
#include "nsLayoutUtils.h"
#include "GeckoProfiler.h"
#include "nsStyleChangeList.h"
#include "nsRuleProcessorData.h"
#include "nsStyleUtil.h"
#include "nsCSSFrameConstructor.h"
#include "nsSVGEffects.h"
#include "nsCSSRendering.h"
#include "nsAnimationManager.h"
#include "nsTransitionManager.h"
#include "nsViewManager.h"
#include "nsRenderingContext.h"
#include "nsSVGIntegrationUtils.h"
#include "nsCSSAnonBoxes.h"
#include "nsContainerFrame.h"
#include "nsPlaceholderFrame.h"
#include "nsBlockFrame.h"
#include "nsViewportFrame.h"
#include "nsSVGTextFrame2.h"
#include "StickyScrollContainer.h"
#include "nsIRootBox.h"
#include "nsIDOMMutationEvent.h"
#include "nsContentUtils.h"
#include "nsIFrameInlines.h"
#include "ActiveLayerTracker.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#endif
namespace mozilla {
RestyleManager::RestyleManager(nsPresContext* aPresContext)
: mPresContext(aPresContext)
, mRebuildAllStyleData(false)
, mObservingRefreshDriver(false)
, mInStyleRefresh(false)
, mHoverGeneration(0)
, mRebuildAllExtraHint(nsChangeHint(0))
, mAnimationGeneration(0)
, mPendingRestyles(ELEMENT_HAS_PENDING_RESTYLE |
ELEMENT_IS_POTENTIAL_RESTYLE_ROOT)
, mPendingAnimationRestyles(ELEMENT_HAS_PENDING_ANIMATION_RESTYLE |
ELEMENT_IS_POTENTIAL_ANIMATION_RESTYLE_ROOT)
{
mPendingRestyles.Init(this);
mPendingAnimationRestyles.Init(this);
}
void
RestyleManager::NotifyDestroyingFrame(nsIFrame* aFrame)
{
mOverflowChangedTracker.RemoveFrame(aFrame);
}
#ifdef DEBUG
// To ensure that the functions below are only called within
// |ApplyRenderingChangeToTree|.
static bool gInApplyRenderingChangeToTree = false;
#endif
static void
DoApplyRenderingChangeToTree(nsIFrame* aFrame,
nsChangeHint aChange);
/**
* 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 and
* nsChangeHint_RepaintFrame and nsChangeHint_UpdateOpacityLayer, nothing else.
*/
static void
SyncViewsAndInvalidateDescendants(nsIFrame* aFrame,
nsChangeHint aChange)
{
NS_PRECONDITION(gInApplyRenderingChangeToTree,
"should only be called within ApplyRenderingChangeToTree");
NS_ASSERTION(aChange == (aChange & (nsChangeHint_RepaintFrame |
nsChangeHint_SyncFrameView |
nsChangeHint_UpdateOpacityLayer)),
"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()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
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);
}
}
}
}
}
/**
* 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->GetFirstPrincipalChild();
}
// 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->GetFirstPrincipalChild();
NS_ABORT_IF_FALSE(aFrame->GetType() == nsGkAtoms::svgOuterSVGAnonChildFrame,
"Where is the nsSVGOuterSVGFrame's anon child??");
}
NS_ABORT_IF_FALSE(aFrame->IsFrameOfType(nsIFrame::eSVG |
nsIFrame::eSVGContainer),
"Children-only transforms only expected on SVG frames");
return aFrame;
}
static void
DoApplyRenderingChangeToTree(nsIFrame* aFrame,
nsChangeHint aChange)
{
NS_PRECONDITION(gInApplyRenderingChangeToTree,
"should only be called within ApplyRenderingChangeToTree");
for ( ; aFrame; aFrame = nsLayoutUtils::GetNextContinuationOrSpecialSibling(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)));
// 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 nsSVGTextFrame2:
NS_ASSERTION(aFrame->GetContent()->IsSVG(nsGkAtoms::textPath),
"expected frame for a <textPath> element");
nsIFrame* text = nsLayoutUtils::GetClosestFrameOfType(
aFrame,
nsGkAtoms::svgTextFrame2);
NS_ASSERTION(text, "expected to find an ancestor nsSVGTextFrame2");
static_cast<nsSVGTextFrame2*>(text)->NotifyGlyphMetricsChange();
} else {
NS_ABORT_IF_FALSE(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) {
needInvalidatingPaint |= !aFrame->TryUpdateTransformOnly();
}
}
if (aChange & nsChangeHint_ChildrenOnlyTransform) {
needInvalidatingPaint = true;
nsIFrame* childFrame =
GetFrameForChildrenOnlyTransformHint(aFrame)->GetFirstPrincipalChild();
for ( ; childFrame; childFrame = childFrame->GetNextSibling()) {
ActiveLayerTracker::NotifyRestyle(childFrame, eCSSProperty_transform);
}
}
aFrame->SchedulePaint(needInvalidatingPaint ?
nsIFrame::PAINT_DEFAULT :
nsIFrame::PAINT_COMPOSITE_ONLY);
}
}
static void
ApplyRenderingChangeToTree(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsChangeHint aChange)
{
// We check StyleDisplay()->HasTransform() 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");
nsIPresShell *shell = aPresContext->PresShell();
if (shell->IsPaintingSuppressed()) {
// Don't allow synchronous rendering changes when painting is turned off.
aChange = NS_SubtractHint(aChange, nsChangeHint_RepaintFrame);
if (!aChange) {
return;
}
}
// If the frame's background is propagated to an ancestor, walk up to
// that ancestor.
nsStyleContext *bgSC;
while (!nsCSSRendering::FindBackground(aFrame, &bgSC)) {
aFrame = aFrame->GetParent();
NS_ASSERTION(aFrame, "root frame must paint");
}
// Trigger rendering updates by damaging this frame and any
// continuations of this frame.
// XXX this needs to detect the need for a view due to an opacity change and deal with it...
#ifdef DEBUG
gInApplyRenderingChangeToTree = true;
#endif
DoApplyRenderingChangeToTree(aFrame, aChange);
#ifdef DEBUG
gInApplyRenderingChangeToTree = false;
#endif
}
bool
RestyleManager::RecomputePosition(nsIFrame* aFrame)
{
// Don't process position changes on table frames, since we already handle
// the dynamic position change on the outer table frame, and the reflow-based
// fallback code path also ignores positions on inner table frames.
if (aFrame->GetType() == nsGkAtoms::tableFrame) {
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;
}
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;
}
aFrame->SchedulePaint();
// For relative positioning, we can simply update the frame rect
if (display->IsRelativelyPositionedStyle()) {
if (display->IsInnerTableStyle()) {
// We don't currently support relative positioning of inner table
// elements (bug 35168). If we apply offsets to things we haven't
// previously offset, we'll get confused. So bail.
return true;
}
// Move the frame
if (display->mPosition == NS_STYLE_POSITION_STICKY) {
// Update sticky positioning for an entire element at once when
// RecomputePosition is called with the first continuation in a chain.
StickyScrollContainer::ComputeStickyOffsets(aFrame);
StickyScrollContainer* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(aFrame);
if (ssc) {
ssc->PositionContinuations(aFrame);
}
} else {
MOZ_ASSERT(NS_STYLE_POSITION_RELATIVE == display->mPosition,
"Unexpected type of positioning");
for (nsIFrame *cont = aFrame; cont;
cont = nsLayoutUtils::GetNextContinuationOrSpecialSibling(cont)) {
nsIFrame* cb = cont->GetContainingBlock();
nsMargin newOffsets;
const nsSize size = cb->GetContentRectRelativeToSelf().Size();
nsHTMLReflowState::ComputeRelativeOffsets(
cb->StyleVisibility()->mDirection,
cont, size.width, size.height, newOffsets);
NS_ASSERTION(newOffsets.left == -newOffsets.right &&
newOffsets.top == -newOffsets.bottom,
"ComputeRelativeOffsets should return valid results");
// nsHTMLReflowState::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.
cont->SetPosition(cont->GetNormalPosition() +
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.
nsRefPtr<nsRenderingContext> rc = aFrame->PresContext()->GetPresShell()->
GetReferenceRenderingContext();
// Construct a bogus parent reflow state so that there's a usable
// containing block reflow state.
nsIFrame* parentFrame = aFrame->GetParent();
nsSize parentSize = parentFrame->GetSize();
nsFrameState savedState = parentFrame->GetStateBits();
nsHTMLReflowState parentReflowState(aFrame->PresContext(), parentFrame,
rc, parentSize);
parentFrame->RemoveStateBits(~nsFrameState(0));
parentFrame->AddStateBits(savedState);
NS_WARN_IF_FALSE(parentSize.width != NS_INTRINSICSIZE &&
parentSize.height != NS_INTRINSICSIZE,
"parentSize should be valid");
parentReflowState.SetComputedWidth(std::max(parentSize.width, 0));
parentReflowState.SetComputedHeight(std::max(parentSize.height, 0));
parentReflowState.mComputedMargin.SizeTo(0, 0, 0, 0);
parentReflowState.mComputedPadding = parentFrame->GetUsedPadding();
parentReflowState.mComputedBorderPadding =
parentFrame->GetUsedBorderAndPadding();
nsSize availSize(parentSize.width, NS_INTRINSICSIZE);
ViewportFrame* viewport = do_QueryFrame(parentFrame);
nsSize cbSize = viewport ?
viewport->AdjustReflowStateAsContainingBlock(&parentReflowState).Size()
: aFrame->GetContainingBlock()->GetSize();
const nsMargin& parentBorder =
parentReflowState.mStyleBorder->GetComputedBorder();
cbSize -= nsSize(parentBorder.LeftRight(), parentBorder.TopBottom());
nsHTMLReflowState reflowState(aFrame->PresContext(), parentReflowState,
aFrame, availSize, cbSize.width,
cbSize.height);
nsSize computedSize(reflowState.ComputedWidth(), reflowState.ComputedHeight());
computedSize.width += reflowState.mComputedBorderPadding.LeftRight();
if (computedSize.height != NS_INTRINSICSIZE) {
computedSize.height += reflowState.mComputedBorderPadding.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 == reflowState.mComputedOffsets.left) {
reflowState.mComputedOffsets.left = cbSize.width -
reflowState.mComputedOffsets.right -
reflowState.mComputedMargin.right -
size.width -
reflowState.mComputedMargin.left;
}
if (NS_AUTOOFFSET == reflowState.mComputedOffsets.top) {
reflowState.mComputedOffsets.top = cbSize.height -
reflowState.mComputedOffsets.bottom -
reflowState.mComputedMargin.bottom -
size.height -
reflowState.mComputedMargin.top;
}
// Move the frame
nsPoint pos(parentBorder.left + reflowState.mComputedOffsets.left +
reflowState.mComputedMargin.left,
parentBorder.top + reflowState.mComputedOffsets.top +
reflowState.mComputedMargin.top);
aFrame->SetPosition(pos);
return true;
}
// Fall back to a reflow
StyleChangeReflow(aFrame, nsChangeHint_NeedReflow);
return false;
}
nsresult
RestyleManager::StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint)
{
// If the frame hasn't even received an initial reflow, then don't
// send it a style-change reflow!
if (aFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW)
return NS_OK;
nsIPresShell::IntrinsicDirty dirtyType;
if (aHint & nsChangeHint_ClearDescendantIntrinsics) {
NS_ASSERTION(aHint & nsChangeHint_ClearAncestorIntrinsics,
"Please read the comments in nsChangeHint.h");
dirtyType = nsIPresShell::eStyleChange;
} else if (aHint & nsChangeHint_ClearAncestorIntrinsics) {
dirtyType = nsIPresShell::eTreeChange;
} else {
dirtyType = nsIPresShell::eResize;
}
nsFrameState dirtyBits;
if (aHint & nsChangeHint_NeedDirtyReflow) {
dirtyBits = NS_FRAME_IS_DIRTY;
} else {
dirtyBits = NS_FRAME_HAS_DIRTY_CHILDREN;
}
do {
mPresContext->PresShell()->FrameNeedsReflow(aFrame, dirtyType, dirtyBits);
aFrame = nsLayoutUtils::GetNextContinuationOrSpecialSibling(aFrame);
} while (aFrame);
return NS_OK;
}
NS_DECLARE_FRAME_PROPERTY(ChangeListProperty, nullptr)
/**
* 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)
{
const nsIFrame::ChildListIDs skip(nsIFrame::kAbsoluteList |
nsIFrame::kFixedList);
for (nsIFrame::ChildListIterator lists(aFrame); !lists.IsDone(); lists.Next()) {
if (!skip.Contains(lists.CurrentID())) {
for (nsFrameList::Enumerator childFrames(lists.CurrentList());
!childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* f = childFrames.get();
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;
}
}
if (FrameHasPositionedPlaceholderDescendants(f, aPositionMask)) {
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::GetNextContinuationOrSpecialSibling(f)) {
if (FrameHasPositionedPlaceholderDescendants(f, positionMask)) {
return true;
}
}
return false;
}
nsresult
RestyleManager::ProcessRestyledFrames(nsStyleChangeList& aChangeList)
{
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"Someone forgot a script blocker");
int32_t count = aChangeList.Count();
if (!count)
return NS_OK;
PROFILER_LABEL("CSS", "ProcessRestyledFrames");
// Make sure to not rebuild quote or counter lists while we're
// processing restyles
FrameConstructor()->BeginUpdate();
FramePropertyTable* propTable = mPresContext->PropertyTable();
// 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
int32_t index = count;
while (0 <= --index) {
const nsStyleChangeData* changeData;
aChangeList.ChangeAt(index, &changeData);
if (changeData->mFrame) {
propTable->Set(changeData->mFrame, ChangeListProperty(),
NS_INT32_TO_PTR(1));
}
}
index = count;
bool didUpdateCursor = false;
while (0 <= --index) {
nsIFrame* frame;
nsIContent* content;
bool didReflowThisFrame = false;
nsChangeHint hint;
aChangeList.ChangeAt(index, frame, content, hint);
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_AddOrRemoveTransform) && frame &&
!(hint & nsChangeHint_ReconstructFrame)) {
if (NeedToReframeForAddingOrRemovingTransform(frame)) {
NS_UpdateHint(hint, nsChangeHint_ReconstructFrame);
} else {
for (nsIFrame *cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrSpecialSibling(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_AddOrRemoveTransform hints up
// to ancestors (i.e. it can't be an inherited change hint).
if (cont->IsPositioned()) {
// If a transform has been added, we'll be taking this path,
// but we may be taking this path even if a transform has been
// removed. It's OK to add the bit even if it's not needed.
cont->AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
if (!cont->IsAbsoluteContainer() &&
(cont->GetStateBits() & NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) {
cont->MarkAsAbsoluteContainingBlock();
}
} else {
// Don't remove NS_FRAME_MAY_BE_TRANSFORMED since it may still by
// transformed by other means. It's OK to have the bit even if it's
// not needed.
if (cont->IsAbsoluteContainer()) {
cont->MarkAsNotAbsoluteContainingBlock();
}
}
}
}
}
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.
FrameConstructor()->RecreateFramesForContent(content, false);
} else {
NS_ASSERTION(frame, "This shouldn't happen");
if ((frame->GetStateBits() & NS_FRAME_SVG_LAYOUT) &&
(frame->GetStateBits() & NS_FRAME_IS_NONDISPLAY)) {
// frame does not maintain overflow rects, so avoid calling
// FinishAndStoreOverflow on it:
hint = NS_SubtractHint(hint,
NS_CombineHint(nsChangeHint_UpdateOverflow,
nsChangeHint_ChildrenOnlyTransform));
}
if (hint & nsChangeHint_UpdateEffects) {
for (nsIFrame *cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrSpecialSibling(cont)) {
nsSVGEffects::UpdateEffects(cont);
}
}
if (hint & nsChangeHint_NeedReflow) {
StyleChangeReflow(frame, hint);
didReflowThisFrame = true;
}
if (hint & (nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView |
nsChangeHint_UpdateOpacityLayer | nsChangeHint_UpdateTransformLayer |
nsChangeHint_ChildrenOnlyTransform)) {
ApplyRenderingChangeToTree(mPresContext, 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 ((hint & nsChangeHint_UpdateOverflow) && !didReflowThisFrame) {
if (hint & nsChangeHint_ChildrenOnlyTransform) {
// The overflow areas of the child frames need to be updated:
nsIFrame* hintFrame = GetFrameForChildrenOnlyTransformHint(frame);
nsIFrame* childFrame = hintFrame->GetFirstPrincipalChild();
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrSpecialSibling(frame),
"SVG frames should not have continuations or special siblings");
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrSpecialSibling(hintFrame),
"SVG frames should not have continuations or special siblings");
for ( ; childFrame; childFrame = childFrame->GetNextSibling()) {
NS_ABORT_IF_FALSE(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);
}
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrSpecialSibling(childFrame),
"SVG frames should not have continuations or special 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))) {
for (nsIFrame *cont = frame; cont; cont =
nsLayoutUtils::GetNextContinuationOrSpecialSibling(cont)) {
mOverflowChangedTracker.AddFrame(cont);
}
}
}
if ((hint & nsChangeHint_UpdateCursor) && !didUpdateCursor) {
mPresContext->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.
index = count;
while (0 <= --index) {
const nsStyleChangeData* changeData;
aChangeList.ChangeAt(index, &changeData);
if (changeData->mFrame) {
propTable->Delete(changeData->mFrame, ChangeListProperty());
}
#ifdef DEBUG
// reget frame from content since it may have been regenerated...
if (changeData->mContent) {
if (!nsAnimationManager::ContentOrAncestorHasAnimation(changeData->mContent) &&
!nsTransitionManager::ContentOrAncestorHasTransition(changeData->mContent)) {
nsIFrame* frame = changeData->mContent->GetPrimaryFrame();
if (frame) {
DebugVerifyStyleTree(frame);
}
}
} else if (!changeData->mFrame ||
changeData->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;
}
void
RestyleManager::RestyleElement(Element* aElement,
nsIFrame* aPrimaryFrame,
nsChangeHint aMinHint,
RestyleTracker& aRestyleTracker,
bool aRestyleDescendants)
{
NS_ASSERTION(aPrimaryFrame == aElement->GetPrimaryFrame(),
"frame/content mismatch");
if (aPrimaryFrame && aPrimaryFrame->GetContent() != aElement) {
// XXXbz this is due to image maps messing with the primary frame pointer
// of <area>s. See bug 135040. We can remove this block once that's fixed.
aPrimaryFrame = nullptr;
}
NS_ASSERTION(!aPrimaryFrame || aPrimaryFrame->GetContent() == aElement,
"frame/content mismatch");
// If we're restyling the root element and there are 'rem' units in
// use, handle dynamic changes to the definition of a 'rem' here.
if (mPresContext->UsesRootEMUnits() && aPrimaryFrame) {
nsStyleContext *oldContext = aPrimaryFrame->StyleContext();
if (!oldContext->GetParent()) { // check that we're the root element
nsRefPtr<nsStyleContext> newContext = mPresContext->StyleSet()->
ResolveStyleFor(aElement, nullptr /* == oldContext->GetParent() */);
if (oldContext->StyleFont()->mFont.size !=
newContext->StyleFont()->mFont.size) {
// The basis for 'rem' units has changed.
newContext = nullptr;
DoRebuildAllStyleData(aRestyleTracker, nsChangeHint(0));
if (aMinHint == 0) {
return;
}
aPrimaryFrame = aElement->GetPrimaryFrame();
}
}
}
if (aMinHint & nsChangeHint_ReconstructFrame) {
FrameConstructor()->RecreateFramesForContent(aElement, false);
} else if (aPrimaryFrame) {
nsStyleChangeList changeList;
ComputeStyleChangeFor(aPrimaryFrame, &changeList, aMinHint,
aRestyleTracker, aRestyleDescendants);
ProcessRestyledFrames(changeList);
} else {
// no frames, reconstruct for content
FrameConstructor()->MaybeRecreateFramesForElement(aElement);
}
}
// Forwarded nsIDocumentObserver method, to handle restyling (and
// passing the notification to the frame).
nsresult
RestyleManager::ContentStateChanged(nsIContent* aContent,
nsEventStates aStateMask)
{
// XXXbz it would be good if this function only took Elements, but
// we'd have to make ESM guarantee that usefully.
if (!aContent->IsElement()) {
return NS_OK;
}
Element* aElement = aContent->AsElement();
nsStyleSet* styleSet = mPresContext->StyleSet();
NS_ASSERTION(styleSet, "couldn't get style set");
nsChangeHint hint = NS_STYLE_HINT_NONE;
// 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();
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)) {
hint = nsChangeHint_ReconstructFrame;
} else {
uint8_t app = primaryFrame->StyleDisplay()->mAppearance;
if (app) {
nsITheme *theme = mPresContext->GetTheme();
if (theme && theme->ThemeSupportsWidget(mPresContext,
primaryFrame, app)) {
bool repaint = false;
theme->WidgetStateChanged(primaryFrame, app, nullptr, &repaint);
if (repaint) {
NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
}
}
}
}
primaryFrame->ContentStatesChanged(aStateMask);
}
nsRestyleHint rshint =
styleSet->HasStateDependentStyle(mPresContext, aElement, aStateMask);
if (aStateMask.HasState(NS_EVENT_STATE_HOVER) && rshint != 0) {
++mHoverGeneration;
}
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.
NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
}
PostRestyleEvent(aElement, rshint, hint);
return NS_OK;
}
// Forwarded nsIMutationObserver method, to handle restyling.
void
RestyleManager::AttributeWillChange(Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
nsRestyleHint rshint =
mPresContext->StyleSet()->HasAttributeDependentStyle(mPresContext,
aElement,
aAttribute,
aModType,
false);
PostRestyleEvent(aElement, rshint, NS_STYLE_HINT_NONE);
}
// Forwarded nsIMutationObserver method, to handle restyling (and
// passing the notification to the frame).
void
RestyleManager::AttributeChanged(Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
// Hold onto the PresShell to prevent ourselves from being destroyed.
// XXXbz how, exactly, would this attribute change cause us to be
// destroyed from inside this function?
nsCOMPtr<nsIPresShell> shell = mPresContext->GetPresShell();
// Get the frame associated with the content which is the highest in the frame tree
nsIFrame* primaryFrame = aElement->GetPrimaryFrame();
#if 0
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("RestyleManager::AttributeChanged: content=%p[%s] frame=%p",
aContent, ContentTag(aElement, 0), frame));
#endif
// the style tag has its own interpretation based on aHint
nsChangeHint hint = aElement->GetAttributeChangeHint(aAttribute, aModType);
bool reframe = (hint & nsChangeHint_ReconstructFrame) != 0;
#ifdef MOZ_XUL
// The following listbox widget trap prevents offscreen listbox widget
// content from being removed and re-inserted (which is what would
// happen otherwise).
if (!primaryFrame && !reframe) {
int32_t namespaceID;
nsIAtom* tag = mPresContext->Document()->BindingManager()->
ResolveTag(aElement, &namespaceID);
if (namespaceID == kNameSpaceID_XUL &&
(tag == nsGkAtoms::listitem ||
tag == nsGkAtoms::listcell))
return;
}
if (aAttribute == nsGkAtoms::tooltiptext ||
aAttribute == nsGkAtoms::tooltip)
{
nsIRootBox* rootBox = nsIRootBox::GetRootBox(mPresContext->GetPresShell());
if (rootBox) {
if (aModType == nsIDOMMutationEvent::REMOVAL)
rootBox->RemoveTooltipSupport(aElement);
if (aModType == nsIDOMMutationEvent::ADDITION)
rootBox->AddTooltipSupport(aElement);
}
}
#endif // MOZ_XUL
if (primaryFrame) {
// See if we have appearance information for a theme.
const nsStyleDisplay* disp = primaryFrame->StyleDisplay();
if (disp->mAppearance) {
nsITheme *theme = mPresContext->GetTheme();
if (theme && theme->ThemeSupportsWidget(mPresContext, primaryFrame, disp->mAppearance)) {
bool repaint = false;
theme->WidgetStateChanged(primaryFrame, disp->mAppearance, aAttribute, &repaint);
if (repaint)
NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
}
}
// let the frame deal with it now, so we don't have to deal later
primaryFrame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
// XXXwaterson should probably check for special IB siblings
// here, and propagate the AttributeChanged notification to
// them, as well. Currently, inline frames don't do anything on
// this notification, so it's not that big a deal.
}
// See if we can optimize away the style re-resolution -- must be called after
// the frame's AttributeChanged() in case it does something that affects the style
nsRestyleHint rshint =
mPresContext->StyleSet()->HasAttributeDependentStyle(mPresContext,
aElement,
aAttribute,
aModType,
true);
PostRestyleEvent(aElement, rshint, hint);
}
void
RestyleManager::RestyleForEmptyChange(Element* aContainer)
{
// In some cases (:empty + E, :empty ~ E), a change if the content of
// an element requires restyling its parent's siblings.
nsRestyleHint hint = eRestyle_Subtree;
nsIContent* grandparent = aContainer->GetParent();
if (grandparent &&
(grandparent->GetFlags() & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS)) {
hint = nsRestyleHint(hint | eRestyle_LaterSiblings);
}
PostRestyleEvent(aContainer, hint, NS_STYLE_HINT_NONE);
}
void
RestyleManager::RestyleForAppend(Element* aContainer,
nsIContent* aFirstNewContent)
{
NS_ASSERTION(aContainer, "must have container for append");
#ifdef DEBUG
{
for (nsIContent* cur = aFirstNewContent; cur; cur = cur->GetNextSibling()) {
NS_ASSERTION(!cur->IsRootOfAnonymousSubtree(),
"anonymous nodes should not be in child lists");
}
}
#endif
uint32_t selectorFlags =
aContainer->GetFlags() & (NODE_ALL_SELECTOR_FLAGS &
~NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
if (selectorFlags == 0)
return;
if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
// see whether we need to restyle the container
bool wasEmpty = true; // :empty or :-moz-only-whitespace
for (nsIContent* cur = aContainer->GetFirstChild();
cur != aFirstNewContent;
cur = cur->GetNextSibling()) {
// We don't know whether we're testing :empty or :-moz-only-whitespace,
// so be conservative and assume :-moz-only-whitespace (i.e., make
// IsSignificantChild less likely to be true, and thus make us more
// likely to restyle).
if (nsStyleUtil::IsSignificantChild(cur, true, false)) {
wasEmpty = false;
break;
}
}
if (wasEmpty) {
RestyleForEmptyChange(aContainer);
return;
}
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR) {
PostRestyleEvent(aContainer, eRestyle_Subtree, NS_STYLE_HINT_NONE);
// Restyling the container is the most we can do here, so we're done.
return;
}
if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
// restyle the last element child before this node
for (nsIContent* cur = aFirstNewContent->GetPreviousSibling();
cur;
cur = cur->GetPreviousSibling()) {
if (cur->IsElement()) {
PostRestyleEvent(cur->AsElement(), eRestyle_Subtree, NS_STYLE_HINT_NONE);
break;
}
}
}
}
// Needed since we can't use PostRestyleEvent on non-elements (with
// eRestyle_LaterSiblings or nsRestyleHint(eRestyle_Subtree |
// eRestyle_LaterSiblings) as appropriate).
static void
RestyleSiblingsStartingWith(RestyleManager* aRestyleManager,
nsIContent* aStartingSibling /* may be null */)
{
for (nsIContent *sibling = aStartingSibling; sibling;
sibling = sibling->GetNextSibling()) {
if (sibling->IsElement()) {
aRestyleManager->
PostRestyleEvent(sibling->AsElement(),
nsRestyleHint(eRestyle_Subtree | eRestyle_LaterSiblings),
NS_STYLE_HINT_NONE);
break;
}
}
}
// Restyling for a ContentInserted or CharacterDataChanged notification.
// This could be used for ContentRemoved as well if we got the
// notification before the removal happened (and sometimes
// CharacterDataChanged is more like a removal than an addition).
// The comments are written and variables are named in terms of it being
// a ContentInserted notification.
void
RestyleManager::RestyleForInsertOrChange(Element* aContainer,
nsIContent* aChild)
{
NS_ASSERTION(!aChild->IsRootOfAnonymousSubtree(),
"anonymous nodes should not be in child lists");
uint32_t selectorFlags =
aContainer ? (aContainer->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
if (selectorFlags == 0)
return;
if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
// see whether we need to restyle the container
bool wasEmpty = true; // :empty or :-moz-only-whitespace
for (nsIContent* child = aContainer->GetFirstChild();
child;
child = child->GetNextSibling()) {
if (child == aChild)
continue;
// We don't know whether we're testing :empty or :-moz-only-whitespace,
// so be conservative and assume :-moz-only-whitespace (i.e., make
// IsSignificantChild less likely to be true, and thus make us more
// likely to restyle).
if (nsStyleUtil::IsSignificantChild(child, true, false)) {
wasEmpty = false;
break;
}
}
if (wasEmpty) {
RestyleForEmptyChange(aContainer);
return;
}
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR) {
PostRestyleEvent(aContainer, eRestyle_Subtree, NS_STYLE_HINT_NONE);
// Restyling the container is the most we can do here, so we're done.
return;
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS) {
// Restyle all later siblings.
RestyleSiblingsStartingWith(this, aChild->GetNextSibling());
}
if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
// restyle the previously-first element child if it is after this node
bool passedChild = false;
for (nsIContent* content = aContainer->GetFirstChild();
content;
content = content->GetNextSibling()) {
if (content == aChild) {
passedChild = true;
continue;
}
if (content->IsElement()) {
if (passedChild) {
PostRestyleEvent(content->AsElement(), eRestyle_Subtree,
NS_STYLE_HINT_NONE);
}
break;
}
}
// restyle the previously-last element child if it is before this node
passedChild = false;
for (nsIContent* content = aContainer->GetLastChild();
content;
content = content->GetPreviousSibling()) {
if (content == aChild) {
passedChild = true;
continue;
}
if (content->IsElement()) {
if (passedChild) {
PostRestyleEvent(content->AsElement(), eRestyle_Subtree,
NS_STYLE_HINT_NONE);
}
break;
}
}
}
}
void
RestyleManager::RestyleForRemove(Element* aContainer,
nsIContent* aOldChild,
nsIContent* aFollowingSibling)
{
if (aOldChild->IsRootOfAnonymousSubtree()) {
// This should be an assert, but this is called incorrectly in
// nsHTMLEditor::DeleteRefToAnonymousNode and the assertions were clogging
// up the logs. Make it an assert again when that's fixed.
NS_WARNING("anonymous nodes should not be in child lists (bug 439258)");
}
uint32_t selectorFlags =
aContainer ? (aContainer->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
if (selectorFlags == 0)
return;
if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
// see whether we need to restyle the container
bool isEmpty = true; // :empty or :-moz-only-whitespace
for (nsIContent* child = aContainer->GetFirstChild();
child;
child = child->GetNextSibling()) {
// We don't know whether we're testing :empty or :-moz-only-whitespace,
// so be conservative and assume :-moz-only-whitespace (i.e., make
// IsSignificantChild less likely to be true, and thus make us more
// likely to restyle).
if (nsStyleUtil::IsSignificantChild(child, true, false)) {
isEmpty = false;
break;
}
}
if (isEmpty) {
RestyleForEmptyChange(aContainer);
return;
}
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR) {
PostRestyleEvent(aContainer, eRestyle_Subtree, NS_STYLE_HINT_NONE);
// Restyling the container is the most we can do here, so we're done.
return;
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS) {
// Restyle all later siblings.
RestyleSiblingsStartingWith(this, aFollowingSibling);
}
if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
// restyle the now-first element child if it was after aOldChild
bool reachedFollowingSibling = false;
for (nsIContent* content = aContainer->GetFirstChild();
content;
content = content->GetNextSibling()) {
if (content == aFollowingSibling) {
reachedFollowingSibling = true;
// do NOT continue here; we might want to restyle this node
}
if (content->IsElement()) {
if (reachedFollowingSibling) {
PostRestyleEvent(content->AsElement(), eRestyle_Subtree,
NS_STYLE_HINT_NONE);
}
break;
}
}
// restyle the now-last element child if it was before aOldChild
reachedFollowingSibling = (aFollowingSibling == nullptr);
for (nsIContent* content = aContainer->GetLastChild();
content;
content = content->GetPreviousSibling()) {
if (content->IsElement()) {
if (reachedFollowingSibling) {
PostRestyleEvent(content->AsElement(), eRestyle_Subtree, NS_STYLE_HINT_NONE);
}
break;
}
if (content == aFollowingSibling) {
reachedFollowingSibling = true;
}
}
}
}
void
RestyleManager::RebuildAllStyleData(nsChangeHint aExtraHint)
{
NS_ASSERTION(!(aExtraHint & nsChangeHint_ReconstructFrame),
"Should not reconstruct the root of the frame tree. "
"Use ReconstructDocElementHierarchy instead.");
mRebuildAllStyleData = false;
NS_UpdateHint(aExtraHint, mRebuildAllExtraHint);
mRebuildAllExtraHint = nsChangeHint(0);
nsIPresShell* presShell = mPresContext->GetPresShell();
if (!presShell || !presShell->GetRootFrame())
return;
// Make sure that the viewmanager will outlive the presshell
nsRefPtr<nsViewManager> vm = presShell->GetViewManager();
// Processing the style changes could cause a flush that propagates to
// the parent frame and thus destroys the pres shell.
nsCOMPtr<nsIPresShell> kungFuDeathGrip(presShell);
// We may reconstruct frames below and hence process anything that is in the
// tree. We don't want to get notified to process those items again after.
presShell->GetDocument()->FlushPendingNotifications(Flush_ContentAndNotify);
nsAutoScriptBlocker scriptBlocker;
mPresContext->SetProcessingRestyles(true);
DoRebuildAllStyleData(mPendingRestyles, aExtraHint);
mPresContext->SetProcessingRestyles(false);
// Make sure that we process any pending animation restyles from the
// above style change. Note that we can *almost* implement the above
// by just posting a style change -- except we really need to restyle
// the root frame rather than the root element's primary frame.
ProcessPendingRestyles();
}
void
RestyleManager::DoRebuildAllStyleData(RestyleTracker& aRestyleTracker,
nsChangeHint aExtraHint)
{
// Tell the style set to get the old rule tree out of the way
// so we can recalculate while maintaining rule tree immutability
nsresult rv = mPresContext->StyleSet()->BeginReconstruct();
if (NS_FAILED(rv)) {
return;
}
// Recalculate all of the style contexts for the document
// Note that we can ignore the return value of ComputeStyleChangeFor
// because we never need to reframe the root frame
// XXX This could be made faster by not rerunning rule matching
// (but note that nsPresShell::SetPreferenceStyleRules currently depends
// on us re-running rule matching here
nsStyleChangeList changeList;
// XXX Does it matter that we're passing aExtraHint to the real root
// frame and not the root node's primary frame?
// Note: The restyle tracker we pass in here doesn't matter.
ComputeStyleChangeFor(mPresContext->PresShell()->GetRootFrame(),
&changeList, aExtraHint,
aRestyleTracker, true);
// Process the required changes
ProcessRestyledFrames(changeList);
FlushOverflowChangedTracker();
// Tell the style set it's safe to destroy the old rule tree. We
// must do this after the ProcessRestyledFrames call in case the
// change list has frame reconstructs in it (since frames to be
// reconstructed will still have their old style context pointers
// until they are destroyed).
mPresContext->StyleSet()->EndReconstruct();
}
void
RestyleManager::ProcessPendingRestyles()
{
NS_PRECONDITION(mPresContext->Document(), "No document? Pshaw!");
NS_PRECONDITION(!nsContentUtils::IsSafeToRunScript(),
"Missing a script blocker!");
// Process non-animation restyles...
NS_ABORT_IF_FALSE(!mPresContext->IsProcessingRestyles(),
"Nesting calls to ProcessPendingRestyles?");
mPresContext->SetProcessingRestyles(true);
// Before we process any restyles, we need to ensure that style
// resulting from any throttled animations (animations that we're
// running entirely on the compositor thread) is up-to-date, so that
// if any style changes we cause trigger transitions, we have the
// correct old style for starting the transition.
if (nsLayoutUtils::AreAsyncAnimationsEnabled() &&
mPendingRestyles.Count() > 0) {
++mAnimationGeneration;
mPresContext->TransitionManager()->UpdateAllThrottledStyles();
}
mPendingRestyles.ProcessRestyles();
#ifdef DEBUG
uint32_t oldPendingRestyleCount = mPendingRestyles.Count();
#endif
// ...and then process animation restyles. This needs to happen
// second because we need to start animations that resulted from the
// first set of restyles (e.g., CSS transitions with negative
// transition-delay), and because we need to immediately
// restyle-with-animation any just-restyled elements that are
// mid-transition (since processing the non-animation restyle ignores
// the running transition so it can check for a new change on the same
// property, and then posts an immediate animation style change).
mPresContext->SetProcessingAnimationStyleChange(true);
mPendingAnimationRestyles.ProcessRestyles();
mPresContext->SetProcessingAnimationStyleChange(false);
mPresContext->SetProcessingRestyles(false);
NS_POSTCONDITION(mPendingRestyles.Count() == oldPendingRestyleCount,
"We should not have posted new non-animation restyles while "
"processing animation restyles");
if (mRebuildAllStyleData) {
// We probably wasted a lot of work up above, but this seems safest
// and it should be rarely used.
// This might add us as a refresh observer again; that's ok.
RebuildAllStyleData(nsChangeHint(0));
}
}
void
RestyleManager::BeginProcessingRestyles()
{
// Make sure to not rebuild quote or counter lists while we're
// processing restyles
mPresContext->FrameConstructor()->BeginUpdate();
mInStyleRefresh = true;
}
void
RestyleManager::EndProcessingRestyles()
{
FlushOverflowChangedTracker();
// Set mInStyleRefresh to false now, since the EndUpdate call might
// add more restyles.
mInStyleRefresh = false;
mPresContext->FrameConstructor()->EndUpdate();
#ifdef DEBUG
mPresContext->PresShell()->VerifyStyleTree();
#endif
}
void
RestyleManager::PostRestyleEventCommon(Element* aElement,
nsRestyleHint aRestyleHint,
nsChangeHint aMinChangeHint,
bool aForAnimation)
{
if (MOZ_UNLIKELY(mPresContext->PresShell()->IsDestroying())) {
return;
}
if (aRestyleHint == 0 && !aMinChangeHint) {
// Nothing to do here
return;
}
RestyleTracker& tracker =
aForAnimation ? mPendingAnimationRestyles : mPendingRestyles;
tracker.AddPendingRestyle(aElement, aRestyleHint, aMinChangeHint);
PostRestyleEventInternal(false);
}
void
RestyleManager::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 = mPresContext->PresShell();
if (!mObservingRefreshDriver && !inRefresh) {
mObservingRefreshDriver = mPresContext->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();
}
void
RestyleManager::PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint)
{
NS_ASSERTION(!(aExtraHint & nsChangeHint_ReconstructFrame),
"Should not reconstruct the root of the frame tree. "
"Use ReconstructDocElementHierarchy instead.");
mRebuildAllStyleData = true;
NS_UpdateHint(mRebuildAllExtraHint, aExtraHint);
// Get a restyle event posted if necessary
PostRestyleEventInternal(false);
}
#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(nsPresContext* aPresContext, nsIFrame* aFrame,
nsStyleContext* aContext, nsStyleContext* aParentContext)
{
// get the contexts not provided
if (!aContext) {
aContext = aFrame->StyleContext();
}
if (!aParentContext) {
// Get the correct parent context from the frame
// - if the frame is a placeholder, we get the out of flow frame's context
// as the parent context instead of asking the frame
// get the parent context from the frame (indirectly)
nsIFrame* providerFrame = aFrame->GetParentStyleContextFrame();
if (providerFrame)
aParentContext = providerFrame->StyleContext();
// 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(nsPresContext* aPresContext, nsIFrame* aFrame,
nsStyleContext* aParentContext)
{
nsStyleContext* context = aFrame->StyleContext();
VerifyContextParent(aPresContext, aFrame, context, nullptr);
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
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(aPresContext, outOfFlowFrame, nullptr);
} while ((outOfFlowFrame = outOfFlowFrame->GetNextContinuation()));
// verify placeholder using the parent frame's context as
// parent context
VerifyContextParent(aPresContext, child, nullptr, nullptr);
}
else { // regular frame
VerifyStyleTree(aPresContext, child, nullptr);
}
}
}
}
// do additional contexts
int32_t contextIndex = 0;
for (nsStyleContext* extraContext;
(extraContext = aFrame->GetAdditionalStyleContext(contextIndex));
++contextIndex) {
VerifyContextParent(aPresContext, aFrame, extraContext, context);
}
}
void
RestyleManager::DebugVerifyStyleTree(nsIFrame* aFrame)
{
if (aFrame) {
nsStyleContext* context = aFrame->StyleContext();
nsStyleContext* parentContext = context->GetParent();
VerifyStyleTree(mPresContext, aFrame, parentContext);
}
}
#endif // DEBUG
// aContent must be the content for the frame in question, which may be
// :before/:after content
static void
TryStartingTransition(nsPresContext *aPresContext, nsIContent *aContent,
nsStyleContext *aOldStyleContext,
nsRefPtr<nsStyleContext> *aNewStyleContext /* inout */)
{
if (!aContent || !aContent->IsElement()) {
return;
}
// Notify the transition manager, and if it starts a transition,
// it will give us back a transition-covering style rule which
// we'll use to get *another* style context. We want to ignore
// any already-running transitions, but cover up any that we're
// currently starting with their start value so we don't start
// them again for descendants that inherit that value.
nsCOMPtr<nsIStyleRule> coverRule =
aPresContext->TransitionManager()->StyleContextChanged(
aContent->AsElement(), aOldStyleContext, *aNewStyleContext);
if (coverRule) {
nsCOMArray<nsIStyleRule> rules;
rules.AppendObject(coverRule);
*aNewStyleContext = aPresContext->StyleSet()->
ResolveStyleByAddingRules(*aNewStyleContext, rules);
}
}
static inline dom::Element*
ElementForStyleContext(nsIContent* aParentContent,
nsIFrame* aFrame,
nsCSSPseudoElements::Type aPseudoType)
{
// We don't expect XUL tree stuff here.
NS_PRECONDITION(aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ||
aPseudoType == nsCSSPseudoElements::ePseudo_AnonBox ||
aPseudoType < nsCSSPseudoElements::ePseudo_PseudoElementCount,
"Unexpected pseudo");
// XXX see the comments about the various element confusion in
// ElementRestyler::Restyle.
if (aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) {
return aFrame->GetContent()->AsElement();
}
if (aPseudoType == nsCSSPseudoElements::ePseudo_AnonBox) {
return nullptr;
}
if (aPseudoType == nsCSSPseudoElements::ePseudo_firstLetter) {
NS_ASSERTION(aFrame->GetType() == nsGkAtoms::letterFrame,
"firstLetter pseudoTag without a nsFirstLetterFrame");
nsBlockFrame* block = nsBlockFrame::GetNearestAncestorBlock(aFrame);
return block->GetContent()->AsElement();
}
if (aPseudoType == nsCSSPseudoElements::ePseudo_mozColorSwatch) {
MOZ_ASSERT(aFrame->GetParent() &&
aFrame->GetParent()->GetParent(),
"Color swatch frame should have a parent & grandparent");
nsIFrame* grandparentFrame = aFrame->GetParent()->GetParent();
MOZ_ASSERT(grandparentFrame->GetType() == nsGkAtoms::colorControlFrame,
"Color swatch's grandparent should be nsColorControlFrame");
return grandparentFrame->GetContent()->AsElement();
}
nsIContent* content = aParentContent ? aParentContent : aFrame->GetContent();
return content->AsElement();
}
/**
* FIXME: Temporary. Should merge with following function.
*/
static nsIFrame*
GetPrevContinuationWithPossiblySameStyle(nsIFrame* aFrame)
{
// Account for {ib} splits when looking for "prevContinuation". In
// particular, for the first-continuation of a part of an {ib} split we
// want to use the special prevsibling of the special prevsibling of
// aFrame, which should have the same style context as aFrame itself.
// In particular, if aFrame is the first continuation of an inline part
// of an {ib} split then its special prevsibling is a block, and the
// special prevsibling of _that_ is an inline, just like aFrame.
// Similarly, if aFrame is the first continuation of a block part of an
// {ib} split (an {ib} wrapper block), then its special prevsibling is
// an inline and the special prevsibling of that is either another {ib}
// wrapper block block or null.
nsIFrame *prevContinuation = aFrame->GetPrevContinuation();
if (!prevContinuation && (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL)) {
// We're the first continuation, so we can just get the frame
// property directly
prevContinuation = static_cast<nsIFrame*>(
aFrame->Properties().Get(nsIFrame::IBSplitSpecialPrevSibling()));
if (prevContinuation) {
prevContinuation = static_cast<nsIFrame*>(
prevContinuation->Properties().Get(nsIFrame::IBSplitSpecialPrevSibling()));
}
}
NS_ASSERTION(!prevContinuation ||
prevContinuation->GetContent() == aFrame->GetContent(),
"unexpected content mismatch");
return prevContinuation;
}
/**
* Get the previous continuation or similar special sibling (assuming
* block/inline alternation), conditionally on it having the same style.
* This assumes that we're not between resolving the two (i.e., that
* they're both already resolved.
*/
static nsIFrame*
GetPrevContinuationWithSameStyle(nsIFrame* aFrame)
{
nsIFrame* prevContinuation = GetPrevContinuationWithPossiblySameStyle(aFrame);
if (!prevContinuation) {
return nullptr;
}
nsStyleContext* prevStyle = prevContinuation->StyleContext();
nsStyleContext* selfStyle = aFrame->StyleContext();
if (prevStyle != selfStyle) {
NS_ASSERTION(prevStyle->GetPseudo() != selfStyle->GetPseudo() ||
prevStyle->GetParent() != selfStyle->GetParent(),
"continuations should have the same style context");
prevContinuation = nullptr;
}
return prevContinuation;
}
/**
* Get the next continuation or similar special sibling (assuming
* block/inline alternation), conditionally on it having the same style.
*
* Since this is used when deciding to copy the new style context, it
* takes as an argument the old style context to check if the style is
* the same. When it is used in other contexts (i.e., where the next
* continuation would already have the new style context), the current
* style context should be passed.
*/
static nsIFrame*
GetNextContinuationWithSameStyle(nsIFrame* aFrame,
nsStyleContext* aOldStyleContext)
{
// See GetPrevContinuationWithSameStyle about {ib} splits.
nsIFrame *nextContinuation = aFrame->GetNextContinuation();
if (!nextContinuation && (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL)) {
// We're the last continuation, so we have to hop back to the first
// before getting the frame property
nextContinuation = static_cast<nsIFrame*>(aFrame->FirstContinuation()->
Properties().Get(nsIFrame::IBSplitSpecialSibling()));
if (nextContinuation) {
nextContinuation = static_cast<nsIFrame*>(
nextContinuation->Properties().Get(nsIFrame::IBSplitSpecialSibling()));
}
}
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;
}
return nextContinuation;
}
nsresult
RestyleManager::ReparentStyleContext(nsIFrame* aFrame)
{
if (nsGkAtoms::placeholderFrame == aFrame->GetType()) {
// Also reparent the out-of-flow and all its continuations.
nsIFrame* outOfFlow =
nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame);
NS_ASSERTION(outOfFlow, "no out-of-flow frame");
do {
ReparentStyleContext(outOfFlow);
} while ((outOfFlow = outOfFlow->GetNextContinuation()));
}
// DO NOT verify the style tree before reparenting. The frame
// tree has already been changed, so this check would just fail.
nsStyleContext* oldContext = aFrame->StyleContext();
nsRefPtr<nsStyleContext> newContext;
nsIFrame* providerFrame = aFrame->GetParentStyleContextFrame();
bool isChild = providerFrame && providerFrame->GetParent() == aFrame;
nsStyleContext* newParentContext = nullptr;
nsIFrame* providerChild = nullptr;
if (isChild) {
ReparentStyleContext(providerFrame);
newParentContext = providerFrame->StyleContext();
providerChild = providerFrame;
} else if (providerFrame) {
newParentContext = providerFrame->StyleContext();
} else {
NS_NOTREACHED("Reparenting something that has no usable parent? "
"Shouldn't happen!");
}
// XXX need to do something here to produce the correct style context for
// an IB split whose first inline part is inside a first-line frame.
// Currently the first IB anonymous block's style context takes the first
// part's style context as parent, which is wrong since first-line style
// should not apply to the anonymous block.
#ifdef DEBUG
{
// Check that our assumption that continuations of the same
// pseudo-type and with the same style context parent have the
// same style context is valid before the reresolution. (We need
// to check the pseudo-type and style context parent because of
// :first-letter and :first-line, where we create styled and
// unstyled letter/line frames distinguished by pseudo-type, and
// then need to distinguish their descendants based on having
// different parents.)
nsIFrame *nextContinuation = aFrame->GetNextContinuation();
if (nextContinuation) {
nsStyleContext *nextContinuationContext =
nextContinuation->StyleContext();
NS_ASSERTION(oldContext == nextContinuationContext ||
oldContext->GetPseudo() !=
nextContinuationContext->GetPseudo() ||
oldContext->GetParent() !=
nextContinuationContext->GetParent(),
"continuations should have the same style context");
}
}
#endif
nsIFrame *prevContinuation =
GetPrevContinuationWithPossiblySameStyle(aFrame);
nsStyleContext *prevContinuationContext;
bool copyFromContinuation =
prevContinuation &&
(prevContinuationContext = prevContinuation->StyleContext())
->GetPseudo() == oldContext->GetPseudo() &&
prevContinuationContext->GetParent() == newParentContext;
if (copyFromContinuation) {
// Just use the style context from the frame's previous
// continuation (see assertion about aFrame->GetNextContinuation()
// above, which we would have previously hit for aFrame's previous
// continuation).
newContext = prevContinuationContext;
} else {
nsIFrame* parentFrame = aFrame->GetParent();
Element* element =
ElementForStyleContext(parentFrame ? parentFrame->GetContent() : nullptr,
aFrame,
oldContext->GetPseudoType());
newContext = mPresContext->StyleSet()->
ReparentStyleContext(oldContext, newParentContext, element);
}
if (newContext) {
if (newContext != oldContext) {
// We probably don't want to initiate transitions from
// ReparentStyleContext, since we call it during frame
// construction rather than in response to dynamic changes.
// Also see the comment at the start of
// nsTransitionManager::ConsiderStartingTransition.
#if 0
if (!copyFromContinuation) {
TryStartingTransition(mPresContext, aFrame->GetContent(),
oldContext, &newContext);
}
#endif
// Make sure to call CalcStyleDifference so that the new context ends
// up resolving all the structs the old context resolved.
if (!copyFromContinuation) {
DebugOnly<nsChangeHint> styleChange =
oldContext->CalcStyleDifference(newContext, nsChangeHint(0));
// The style change is always 0 because we have the same rulenode and
// CalcStyleDifference optimizes us away. That's OK, though:
// reparenting should never trigger a frame reconstruct, and whenever
// it's happening we already plan to reflow and repaint the frames.
NS_ASSERTION(!(styleChange & nsChangeHint_ReconstructFrame),
"Our frame tree is likely to be bogus!");
}
aFrame->SetStyleContext(newContext);
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
// only do frames that are in flow
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW) &&
child != providerChild) {
#ifdef DEBUG
if (nsGkAtoms::placeholderFrame == child->GetType()) {
nsIFrame* outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(child);
NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");
NS_ASSERTION(outOfFlowFrame != providerChild,
"Out of flow provider?");
}
#endif
ReparentStyleContext(child);
}
}
}
// If this frame is part of an IB split, then the style context of
// the next part of the split might be a child of our style context.
// Reparent its style context just in case one of our ancestors
// (split or not) hasn't done so already). It's not a problem to
// reparent the same frame twice because the "if (newContext !=
// oldContext)" check will prevent us from redoing work.
if ((aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL) &&
!aFrame->GetPrevContinuation()) {
nsIFrame* sib = static_cast<nsIFrame*>
(aFrame->Properties().Get(nsIFrame::IBSplitSpecialSibling()));
if (sib) {
ReparentStyleContext(sib);
}
}
// do additional contexts
int32_t contextIndex = 0;
for (nsStyleContext* oldExtraContext;
(oldExtraContext = aFrame->GetAdditionalStyleContext(contextIndex));
++contextIndex) {
nsRefPtr<nsStyleContext> newExtraContext;
newExtraContext = mPresContext->StyleSet()->
ReparentStyleContext(oldExtraContext,
newContext, nullptr);
if (newExtraContext) {
if (newExtraContext != oldExtraContext) {
// Make sure to call CalcStyleDifference so that the new
// context ends up resolving all the structs the old context
// resolved.
DebugOnly<nsChangeHint> styleChange =
oldExtraContext->CalcStyleDifference(newExtraContext,
nsChangeHint(0));
// The style change is always 0 because we have the same
// rulenode and CalcStyleDifference optimizes us away. That's
// OK, though: reparenting should never trigger a frame
// reconstruct, and whenever it's happening we already plan to
// reflow and repaint the frames.
NS_ASSERTION(!(styleChange & nsChangeHint_ReconstructFrame),
"Our frame tree is likely to be bogus!");
}
aFrame->SetAdditionalStyleContext(contextIndex, newExtraContext);
}
}
#ifdef DEBUG
VerifyStyleTree(mPresContext, aFrame, newParentContext);
#endif
}
}
return NS_OK;
}
ElementRestyler::ElementRestyler(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsStyleChangeList* aChangeList,
nsChangeHint aHintsHandledByAncestors,
RestyleTracker& aRestyleTracker,
TreeMatchContext& aTreeMatchContext,
nsTArray<nsIContent*>&
aVisibleKidsOfHiddenElement)
: mPresContext(aPresContext)
, mFrame(aFrame)
, mParentContent(nullptr)
// XXXldb Why does it make sense to use aParentContent? (See
// comment above assertion at start of ElementRestyler::Restyle.)
, mContent(mFrame->GetContent() ? mFrame->GetContent() : mParentContent)
, mChangeList(aChangeList)
, mHintsHandled(NS_SubtractHint(aHintsHandledByAncestors,
NS_HintsNotHandledForDescendantsIn(aHintsHandledByAncestors)))
, mParentFrameHintsNotHandledForDescendants(nsChangeHint(0))
, mHintsNotHandledForDescendants(nsChangeHint(0))
, mRestyleTracker(aRestyleTracker)
, mTreeMatchContext(aTreeMatchContext)
, mResolvedChild(nullptr)
#ifdef ACCESSIBILITY
, mDesiredA11yNotifications(eSendAllNotifications)
, mKidsDesiredA11yNotifications(mDesiredA11yNotifications)
, mOurA11yNotification(eDontNotify)
, mVisibleKidsOfHiddenElement(aVisibleKidsOfHiddenElement)
#endif
{
}
ElementRestyler::ElementRestyler(const ElementRestyler& aParentRestyler,
nsIFrame* aFrame,
uint32_t aConstructorFlags)
: mPresContext(aParentRestyler.mPresContext)
, mFrame(aFrame)
, mParentContent(aParentRestyler.mContent)
// XXXldb Why does it make sense to use aParentContent? (See
// comment above assertion at start of ElementRestyler::Restyle.)
, mContent(mFrame->GetContent() ? mFrame->GetContent() : mParentContent)
, mChangeList(aParentRestyler.mChangeList)
, mHintsHandled(NS_SubtractHint(aParentRestyler.mHintsHandled,
NS_HintsNotHandledForDescendantsIn(aParentRestyler.mHintsHandled)))
, mParentFrameHintsNotHandledForDescendants(
aParentRestyler.mHintsNotHandledForDescendants)
, mHintsNotHandledForDescendants(nsChangeHint(0))
, mRestyleTracker(aParentRestyler.mRestyleTracker)
, mTreeMatchContext(aParentRestyler.mTreeMatchContext)
, mResolvedChild(nullptr)
#ifdef ACCESSIBILITY
, mDesiredA11yNotifications(aParentRestyler.mKidsDesiredA11yNotifications)
, mKidsDesiredA11yNotifications(mDesiredA11yNotifications)
, mOurA11yNotification(eDontNotify)
, mVisibleKidsOfHiddenElement(aParentRestyler.mVisibleKidsOfHiddenElement)
#endif
{
if (aConstructorFlags & FOR_OUT_OF_FLOW_CHILD) {
// Note that the out-of-flow may not be a geometric descendant of
// the frame where we started the reresolve. Therefore, even if
// mHintsHandled already includes nsChangeHint_AllReflowHints we
// don't want to pass that on to the out-of-flow reresolve, since
// that can lead to the out-of-flow not getting reflowed when it
// should be (eg a reresolve starting at <body> that involves
// reflowing the <body> would miss reflowing fixed-pos nodes that
// also need reflow). In the cases when the out-of-flow _is_ a
// geometric descendant of a frame we already have a reflow hint
// for, reflow coalescing should keep us from doing the work twice.
mHintsHandled = NS_SubtractHint(mHintsHandled, nsChangeHint_AllReflowHints);
}
}
ElementRestyler::ElementRestyler(ParentContextFromChildFrame,
const ElementRestyler& aParentRestyler,
nsIFrame* aFrame)
: mPresContext(aParentRestyler.mPresContext)
, mFrame(aFrame)
, mParentContent(aParentRestyler.mParentContent)
// XXXldb Why does it make sense to use aParentContent? (See
// comment above assertion at start of ElementRestyler::Restyle.)
, mContent(mFrame->GetContent() ? mFrame->GetContent() : mParentContent)
, mChangeList(aParentRestyler.mChangeList)
, mHintsHandled(NS_SubtractHint(aParentRestyler.mHintsHandled,
NS_HintsNotHandledForDescendantsIn(aParentRestyler.mHintsHandled)))
, mParentFrameHintsNotHandledForDescendants(
// assume the worst
nsChangeHint_Hints_NotHandledForDescendants)
, mHintsNotHandledForDescendants(nsChangeHint(0))
, mRestyleTracker(aParentRestyler.mRestyleTracker)
, mTreeMatchContext(aParentRestyler.mTreeMatchContext)
, mResolvedChild(nullptr)
#ifdef ACCESSIBILITY
, mDesiredA11yNotifications(aParentRestyler.mDesiredA11yNotifications)
, mKidsDesiredA11yNotifications(mDesiredA11yNotifications)
, mOurA11yNotification(eDontNotify)
, mVisibleKidsOfHiddenElement(aParentRestyler.mVisibleKidsOfHiddenElement)
#endif
{
}
void
ElementRestyler::CaptureChange(nsStyleContext* aOldContext,
nsStyleContext* aNewContext,
nsChangeHint aChangeToAssume)
{
// Check some invariants about replacing one style context with another.
NS_ASSERTION(aOldContext->GetPseudo() == aNewContext->GetPseudo(),
"old and new style contexts should have the same pseudo");
NS_ASSERTION(aOldContext->GetPseudoType() == aNewContext->GetPseudoType(),
"old and new style contexts should have the same pseudo");
nsChangeHint ourChange = aOldContext->CalcStyleDifference(aNewContext,
mParentFrameHintsNotHandledForDescendants);
NS_ASSERTION(!(ourChange & nsChangeHint_AllReflowHints) ||
(ourChange & nsChangeHint_NeedReflow),
"Reflow hint bits set without actually asking for a reflow");
// nsChangeHint_UpdateEffects is inherited, but it can be set due to changes
// in inherited properties (fill and stroke). Avoid propagating it into
// text nodes.
if ((ourChange & nsChangeHint_UpdateEffects) &&
mContent && !mContent->IsElement()) {
ourChange = NS_SubtractHint(ourChange, nsChangeHint_UpdateEffects);
}
NS_UpdateHint(ourChange, aChangeToAssume);
if (NS_UpdateHint(mHintsHandled, ourChange)) {
if (!(ourChange & nsChangeHint_ReconstructFrame) || mContent) {
mChangeList->AppendChange(mFrame, mContent, ourChange);
}
}
NS_UpdateHint(mHintsNotHandledForDescendants,
NS_HintsNotHandledForDescendantsIn(ourChange));
}
/**
* Recompute style for mFrame (which should not have a prev continuation
* with the same style), all of its next continuations with the same
* style, and all special siblings of the same type (either block or
* inline, skipping the intermediates of the other type) and accumulate
* changes into mChangeList given that mHintsHandled is already accumulated
* for an ancestor.
* mParentContent is the content node used to resolve the parent style
* context. This means that, for pseudo-elements, it is the content
* that should be used for selector matching (rather than the fake
* content node attached to the frame).
*/
void
ElementRestyler::Restyle(nsRestyleHint aRestyleHint)
{
// It would be nice if we could make stronger assertions here; they
// would let us simplify the ?: expressions below setting |content|
// and |pseudoContent| in sensible ways as well as making what
// |content| and |pseudoContent| mean, and their relationship to
// |mFrame->GetContent()|, make more sense. However, we can't,
// because of frame trees like the one in
// https://bugzilla.mozilla.org/show_bug.cgi?id=472353#c14 . Once we
// fix bug 242277 we should be able to make this make more sense.
NS_ASSERTION(mFrame->GetContent() || !mParentContent ||
!mParentContent->GetParent(),
"frame must have content (unless at the top of the tree)");
NS_ASSERTION(!GetPrevContinuationWithSameStyle(mFrame),
"should not be trying to restyle this frame separately");
if (mContent && mContent->IsElement()) {
mContent->OwnerDoc()->FlushPendingLinkUpdates();
RestyleTracker::RestyleData restyleData;
if (mRestyleTracker.GetRestyleData(mContent->AsElement(), &restyleData)) {
if (NS_UpdateHint(mHintsHandled, restyleData.mChangeHint)) {
mChangeList->AppendChange(mFrame, mContent, restyleData.mChangeHint);
}
aRestyleHint = nsRestyleHint(aRestyleHint | restyleData.mRestyleHint);
}
}
nsRestyleHint childRestyleHint = aRestyleHint;
if (childRestyleHint == eRestyle_Self) {
childRestyleHint = nsRestyleHint(0);
}
{
nsRefPtr<nsStyleContext> oldContext = mFrame->StyleContext();
// TEMPORARY (until bug 918064): Call RestyleSelf for each
// continuation or block-in-inline sibling.
for (nsIFrame* f = mFrame; f;
f = GetNextContinuationWithSameStyle(f, oldContext)) {
RestyleSelf(f, aRestyleHint);
}
}
RestyleChildren(childRestyleHint);
}
void
ElementRestyler::RestyleSelf(nsIFrame* aSelf, nsRestyleHint aRestyleHint)
{
// XXXldb get new context from prev-in-flow if possible, to avoid
// duplication. (Or should we just let |GetContext| handle that?)
// Getting the hint would be nice too, but that's harder.
// XXXbryner we may be able to avoid some of the refcounting goop here.
// We do need a reference to oldContext for the lifetime of this function, and it's possible
// that the frame has the last reference to it, so AddRef it here.
nsChangeHint assumeDifferenceHint = NS_STYLE_HINT_NONE;
nsRefPtr<nsStyleContext> oldContext = aSelf->StyleContext();
nsStyleSet* styleSet = mPresContext->StyleSet();
#ifdef ACCESSIBILITY
mWasFrameVisible = nsIPresShell::IsAccessibilityActive() ?
oldContext->StyleVisibility()->IsVisible() : false;
#endif
nsIAtom* const pseudoTag = oldContext->GetPseudo();
const nsCSSPseudoElements::Type pseudoType = oldContext->GetPseudoType();
nsStyleContext* parentContext;
// Get the frame providing the parent style context. If it is a
// child, then resolve the provider first.
nsIFrame* providerFrame = aSelf->GetParentStyleContextFrame();
bool isChild = providerFrame && providerFrame->GetParent() == aSelf;
if (!isChild) {
if (providerFrame)
parentContext = providerFrame->StyleContext();
else
parentContext = nullptr;
}
else {
MOZ_ASSERT(providerFrame->GetContent() == aSelf->GetContent(),
"Postcondition for GetParentStyleContextFrame() violated. "
"That means we need to add the current element to the "
"ancestor filter.");
// resolve the provider here (before aSelf below).
// assumeDifferenceHint forces the parent's change to be also
// applied to this frame, no matter what
// nsStyleContext::CalcStyleDifference says. CalcStyleDifference
// can't be trusted because it assumes any changes to the parent
// style context provider will be automatically propagated to
// the frame(s) with child style contexts.
ElementRestyler providerRestyler(PARENT_CONTEXT_FROM_CHILD_FRAME,
*this, providerFrame);
providerRestyler.Restyle(aRestyleHint);
assumeDifferenceHint = providerRestyler.HintsHandledForFrame();
// The provider's new context becomes the parent context of
// aSelf's context.
parentContext = providerFrame->StyleContext();
// Set |mResolvedChild| so we don't bother resolving the
// provider again.
mResolvedChild = providerFrame;
}
if (providerFrame != aSelf->GetParent()) {
// We don't actually know what the parent style context's
// non-inherited hints were, so assume the worst.
mParentFrameHintsNotHandledForDescendants =
nsChangeHint_Hints_NotHandledForDescendants;
}
// do primary context
nsRefPtr<nsStyleContext> newContext;
nsIFrame *prevContinuation =
GetPrevContinuationWithPossiblySameStyle(aSelf);
nsStyleContext *prevContinuationContext;
bool copyFromContinuation =
prevContinuation &&
(prevContinuationContext = prevContinuation->StyleContext())
->GetPseudo() == oldContext->GetPseudo() &&
prevContinuationContext->GetParent() == parentContext;
if (copyFromContinuation) {
// Just use the style context from the frame's previous
// continuation.
newContext = prevContinuationContext;
}
else if (pseudoTag == nsCSSAnonBoxes::mozNonElement) {
NS_ASSERTION(aSelf->GetContent(),
"non pseudo-element frame without content node");
newContext = styleSet->ResolveStyleForNonElement(parentContext);
}
else if (!aRestyleHint && !prevContinuation) {
// Unfortunately, if prevContinuation is non-null then we may have
// already stolen the restyle tracker entry for this element while
// processing prevContinuation. So we don't know whether aRestyleHint
// should really be 0 here or whether it should be eRestyle_Self. Be
// pessimistic and force an actual reresolve in that situation. The good
// news is that in the common case when prevContinuation is non-null we
// just used prevContinuationContext anyway and aren't reaching this code
// to start with.
newContext =
styleSet->ReparentStyleContext(oldContext, parentContext,
ElementForStyleContext(mParentContent,
aSelf, pseudoType));
} else if (pseudoType == nsCSSPseudoElements::ePseudo_AnonBox) {
newContext = styleSet->ResolveAnonymousBoxStyle(pseudoTag,
parentContext);
}
else {
Element* element = ElementForStyleContext(mParentContent, aSelf, pseudoType);
if (pseudoTag) {
if (pseudoTag == nsCSSPseudoElements::before ||
pseudoTag == nsCSSPseudoElements::after) {
// XXX what other pseudos do we need to treat like this?
newContext = styleSet->ProbePseudoElementStyle(element,
pseudoType,
parentContext,
mTreeMatchContext);
if (!newContext) {
// This pseudo should no longer exist; gotta reframe
NS_UpdateHint(mHintsHandled, nsChangeHint_ReconstructFrame);
mChangeList->AppendChange(aSelf, element,
nsChangeHint_ReconstructFrame);
// We're reframing anyway; just keep the same context
newContext = oldContext;
}
} else if (nsCSSPseudoElements::PseudoElementSupportsStyleAttribute(pseudoTag)) {
newContext = styleSet->ResolvePseudoElementStyle(element,
pseudoType,
parentContext,
aSelf->GetContent()->AsElement());
} else {
// Don't expect XUL tree stuff here, since it needs a comparator and
// all.
NS_ASSERTION(pseudoType <
nsCSSPseudoElements::ePseudo_PseudoElementCount,
"Unexpected pseudo type");
newContext = styleSet->ResolvePseudoElementStyle(element,
pseudoType,
parentContext);
}
}
else {
NS_ASSERTION(aSelf->GetContent(),
"non pseudo-element frame without content node");
// Skip flex-item style fixup for anonymous subtrees:
TreeMatchContext::AutoFlexItemStyleFixupSkipper
flexFixupSkipper(mTreeMatchContext,
element->IsRootOfNativeAnonymousSubtree());
newContext = styleSet->ResolveStyleFor(element, parentContext,
mTreeMatchContext);
}
}
MOZ_ASSERT(newContext);
if (!parentContext) {
if (oldContext->RuleNode() == newContext->RuleNode() &&
oldContext->IsLinkContext() == newContext->IsLinkContext() &&
oldContext->RelevantLinkVisited() ==
newContext->RelevantLinkVisited()) {
// We're the root of the style context tree and the new style
// context returned has the same rule node. This means that
// we can use FindChildWithRules to keep a lot of the old
// style contexts around. However, we need to start from the
// same root.
newContext = oldContext;
}
}
if (newContext != oldContext) {
if (!copyFromContinuation) {
TryStartingTransition(mPresContext, aSelf->GetContent(),
oldContext, &newContext);
CaptureChange(oldContext, newContext, assumeDifferenceHint);
}
if (!(mHintsHandled & nsChangeHint_ReconstructFrame)) {
// If the frame gets regenerated, let it keep its old context,
// which is important to maintain various invariants about
// frame types matching their style contexts.
// Note that this check even makes sense if we didn't call
// CaptureChange because of copyFromContinuation being true,
// since we'll have copied the existing context from the
// previous continuation, so newContext == oldContext.
aSelf->SetStyleContext(newContext);
}
}
oldContext = nullptr;
// do additional contexts
// XXXbz might be able to avoid selector matching here in some
// cases; won't worry about it for now.
int32_t contextIndex = 0;
for (nsStyleContext* oldExtraContext;
(oldExtraContext = aSelf->GetAdditionalStyleContext(contextIndex));
++contextIndex) {
nsRefPtr<nsStyleContext> newExtraContext;
nsIAtom* const extraPseudoTag = oldExtraContext->GetPseudo();
const nsCSSPseudoElements::Type extraPseudoType =
oldExtraContext->GetPseudoType();
NS_ASSERTION(extraPseudoTag &&
extraPseudoTag != nsCSSAnonBoxes::mozNonElement,
"extra style context is not pseudo element");
if (extraPseudoType == nsCSSPseudoElements::ePseudo_AnonBox) {
newExtraContext = styleSet->ResolveAnonymousBoxStyle(extraPseudoTag,
newContext);
}
else {
// Don't expect XUL tree stuff here, since it needs a comparator and
// all.
NS_ASSERTION(extraPseudoType <
nsCSSPseudoElements::ePseudo_PseudoElementCount,
"Unexpected type");
newExtraContext = styleSet->ResolvePseudoElementStyle(mContent->AsElement(),
extraPseudoType,
newContext);
}
MOZ_ASSERT(newExtraContext);
if (oldExtraContext != newExtraContext) {
CaptureChange(oldExtraContext, newExtraContext, assumeDifferenceHint);
if (!(mHintsHandled & nsChangeHint_ReconstructFrame)) {
aSelf->SetAdditionalStyleContext(contextIndex, newExtraContext);
}
}
}
}
void
ElementRestyler::RestyleChildren(nsRestyleHint aChildRestyleHint)
{
RestyleUndisplayedChildren(aChildRestyleHint);
// Check whether we might need to create a new ::before frame.
// There's no need to do this if we're planning to reframe already
// or if we're not forcing restyles on kids.
// It's also important to check mHintsHandled since we use
// mFrame->StyleContext(), which is out of date if mHintsHandled has a
// ReconstructFrame hint. Using an out of date style context could
// trigger assertions about mismatched rule trees.
if (!(mHintsHandled & nsChangeHint_ReconstructFrame) &&
aChildRestyleHint) {
RestyleBeforePseudo();
}
// There is no need to waste time crawling into a frame's children
// on a frame change. The act of reconstructing frames will force
// new style contexts to be resolved on all of this frame's
// descendants anyway, so we want to avoid wasting time processing
// style contexts that we're just going to throw away anyway. - dwh
// It's also important to check mHintsHandled since reresolving the
// kids would use mFrame->StyleContext(), which is out of date if
// mHintsHandled has a ReconstructFrame hint; doing this could trigger
// assertions about mismatched rule trees.
nsIFrame *lastContinuation;
if (!(mHintsHandled & nsChangeHint_ReconstructFrame)) {
InitializeAccessibilityNotifications();
for (nsIFrame* f = mFrame; f;
f = GetNextContinuationWithSameStyle(f, f->StyleContext())) {
lastContinuation = f;
RestyleContentChildren(f, aChildRestyleHint);
}
SendAccessibilityNotifications();
}
// Check whether we might need to create a new ::after frame.
// See comments above regarding :before.
if (!(mHintsHandled & nsChangeHint_ReconstructFrame) &&
aChildRestyleHint) {
RestyleAfterPseudo(lastContinuation);
}
}
void
ElementRestyler::RestyleUndisplayedChildren(nsRestyleHint aChildRestyleHint)
{
// When the root element is display:none, we still construct *some*
// frames that have the root element as their mContent, down to the
// DocElementContainingBlock.
bool checkUndisplayed;
nsIContent* undisplayedParent;
nsCSSFrameConstructor* frameConstructor = mPresContext->FrameConstructor();
if (mFrame->StyleContext()->GetPseudo()) {
checkUndisplayed = mFrame == frameConstructor->
GetDocElementContainingBlock();
undisplayedParent = nullptr;
} else {
checkUndisplayed = !!mFrame->GetContent();
undisplayedParent = mFrame->GetContent();
}
if (checkUndisplayed &&
// No need to do this if we're planning to reframe already.
// It's also important to check mHintsHandled since we use
// mFrame->StyleContext(), which is out of date if mHintsHandled
// has a ReconstructFrame hint. Using an out of date style
// context could trigger assertions about mismatched rule trees.
!(mHintsHandled & nsChangeHint_ReconstructFrame)) {
UndisplayedNode* undisplayed =
frameConstructor->GetAllUndisplayedContentIn(undisplayedParent);
TreeMatchContext::AutoAncestorPusher pusher(mTreeMatchContext);
if (undisplayed) {
pusher.PushAncestorAndStyleScope(undisplayedParent);
}
for (; undisplayed; undisplayed = undisplayed->mNext) {
NS_ASSERTION(undisplayedParent ||
undisplayed->mContent ==
mPresContext->Document()->GetRootElement(),
"undisplayed node child of null must be root");
NS_ASSERTION(!undisplayed->mStyle->GetPseudo(),
"Shouldn't have random pseudo style contexts in the "
"undisplayed map");
// Get the parent of the undisplayed content and check if it is a XBL
// children element. Push the children element as an ancestor here because it does
// not have a frame and would not otherwise be pushed as an ancestor.
nsIContent* parent = undisplayed->mContent->GetParent();
TreeMatchContext::AutoAncestorPusher insertionPointPusher(mTreeMatchContext);
if (parent && parent->IsActiveChildrenElement()) {
insertionPointPusher.PushAncestorAndStyleScope(parent);
}
nsRestyleHint thisChildHint = aChildRestyleHint;
RestyleTracker::RestyleData undisplayedRestyleData;
if (mRestyleTracker.GetRestyleData(undisplayed->mContent->AsElement(),
&undisplayedRestyleData)) {
thisChildHint =
nsRestyleHint(thisChildHint | undisplayedRestyleData.mRestyleHint);
}
nsRefPtr<nsStyleContext> undisplayedContext;
nsStyleSet* styleSet = mPresContext->StyleSet();
if (thisChildHint) {
undisplayedContext =
styleSet->ResolveStyleFor(undisplayed->mContent->AsElement(),
mFrame->StyleContext(),
mTreeMatchContext);
} else {
undisplayedContext =
styleSet->ReparentStyleContext(undisplayed->mStyle,
mFrame->StyleContext(),
undisplayed->mContent->AsElement());
}
const nsStyleDisplay* display = undisplayedContext->StyleDisplay();
if (display->mDisplay != NS_STYLE_DISPLAY_NONE) {
NS_ASSERTION(undisplayed->mContent,
"Must have undisplayed content");
mChangeList->AppendChange(nullptr, undisplayed->mContent,
NS_STYLE_HINT_FRAMECHANGE);
// The node should be removed from the undisplayed map when
// we reframe it.
} else {
// update the undisplayed node with the new context
undisplayed->mStyle = undisplayedContext;
}
}
}
}
void
ElementRestyler::RestyleBeforePseudo()
{
// Make sure not to do this for pseudo-frames or frames that
// can't have generated content.
if (!mFrame->StyleContext()->GetPseudo() &&
((mFrame->GetStateBits() & NS_FRAME_MAY_HAVE_GENERATED_CONTENT) ||
// Our content insertion frame might have gotten flagged
(mFrame->GetContentInsertionFrame()->GetStateBits() &
NS_FRAME_MAY_HAVE_GENERATED_CONTENT))) {
// Check for a new :before pseudo and an existing :before
// frame, but only if the frame is the first continuation.
nsIFrame* prevContinuation = mFrame->GetPrevContinuation();
if (!prevContinuation) {
// Checking for a :before frame is cheaper than getting the
// :before style context.
if (!nsLayoutUtils::GetBeforeFrame(mFrame) &&
nsLayoutUtils::HasPseudoStyle(mFrame->GetContent(),
mFrame->StyleContext(),
nsCSSPseudoElements::ePseudo_before,
mPresContext)) {
// Have to create the new :before frame
NS_UpdateHint(mHintsHandled, nsChangeHint_ReconstructFrame);
mChangeList->AppendChange(mFrame, mContent,
nsChangeHint_ReconstructFrame);
}
}
}
}
/**
* aFrame is the last continuation or block-in-inline sibling that this
* ElementRestyler is restyling.
*/
void
ElementRestyler::RestyleAfterPseudo(nsIFrame* aFrame)
{
// Make sure not to do this for pseudo-frames or frames that
// can't have generated content.
if (!aFrame->StyleContext()->GetPseudo() &&
((aFrame->GetStateBits() & NS_FRAME_MAY_HAVE_GENERATED_CONTENT) ||
// Our content insertion frame might have gotten flagged
(aFrame->GetContentInsertionFrame()->GetStateBits() &
NS_FRAME_MAY_HAVE_GENERATED_CONTENT))) {
// Check for new :after content, but only if the frame is the
// last continuation.
nsIFrame* nextContinuation = aFrame->GetNextContinuation();
if (!nextContinuation) {
// Getting the :after frame is more expensive than getting the pseudo
// context, so get the pseudo context first.
if (nsLayoutUtils::HasPseudoStyle(aFrame->GetContent(),
aFrame->StyleContext(),
nsCSSPseudoElements::ePseudo_after,
mPresContext) &&
!nsLayoutUtils::GetAfterFrame(aFrame)) {
// have to create the new :after frame
NS_UpdateHint(mHintsHandled, nsChangeHint_ReconstructFrame);
mChangeList->AppendChange(aFrame, mContent,
nsChangeHint_ReconstructFrame);
}
}
}
}
void
ElementRestyler::InitializeAccessibilityNotifications()
{
#ifdef ACCESSIBILITY
// Notify a11y for primary frame only if it's a root frame of visibility
// changes or its parent frame was hidden while it stays visible and
// it is not inside a {ib} split or is the first frame of {ib} split.
if (nsIPresShell::IsAccessibilityActive() &&
!mFrame->GetPrevContinuation() &&
!mFrame->FrameIsNonFirstInIBSplit()) {
if (mDesiredA11yNotifications == eSendAllNotifications) {
bool isFrameVisible = mFrame->StyleVisibility()->IsVisible();
if (isFrameVisible != mWasFrameVisible) {
if (isFrameVisible) {
// Notify a11y the element (perhaps with its children) was shown.
// We don't fall into this case if this element gets or stays shown
// while its parent becomes hidden.
mKidsDesiredA11yNotifications = eSkipNotifications;
mOurA11yNotification = eNotifyShown;
} else {
// The element is being hidden; its children may stay visible, or
// become visible after being hidden previously. If we'll find
// visible children then we should notify a11y about that as if
// they were inserted into tree. Notify a11y this element was
// hidden.
mKidsDesiredA11yNotifications = eNotifyIfShown;
mOurA11yNotification = eNotifyHidden;
}
}
} else if (mDesiredA11yNotifications == eNotifyIfShown &&
mFrame->StyleVisibility()->IsVisible()) {
// Notify a11y that element stayed visible while its parent was
// hidden.
mVisibleKidsOfHiddenElement.AppendElement(mFrame->GetContent());
mKidsDesiredA11yNotifications = eSkipNotifications;
}
}
#endif
}
void
ElementRestyler::RestyleContentChildren(nsIFrame* aParent,
nsRestyleHint aChildRestyleHint)
{
nsIFrame::ChildListIterator lists(aParent);
TreeMatchContext::AutoAncestorPusher ancestorPusher(mTreeMatchContext);
if (!lists.IsDone()) {
ancestorPusher.PushAncestorAndStyleScope(mContent);
}
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
// Out-of-flows are reached through their placeholders. Continuations
// and block-in-inline splits are reached through those chains.
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW) &&
!GetPrevContinuationWithSameStyle(child)) {
// Get the parent of the child frame's content and check if it
// is a XBL children element. Push the children element as an
// ancestor here because it does not have a frame and would not
// otherwise be pushed as an ancestor.
// Check if the frame has a content because |child| may be a
// nsPageFrame that does not have a content.
nsIContent* parent = child->GetContent() ? child->GetContent()->GetParent() : nullptr;
TreeMatchContext::AutoAncestorPusher insertionPointPusher(mTreeMatchContext);
if (parent && parent->IsActiveChildrenElement()) {
insertionPointPusher.PushAncestorAndStyleScope(parent);
}
// only do frames that are in flow
if (nsGkAtoms::placeholderFrame == child->GetType()) { // placeholder
// get out of flow frame and recur there
nsIFrame* outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(child);
NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");
NS_ASSERTION(outOfFlowFrame != mResolvedChild,
"out-of-flow frame not a true descendant");
// |nsFrame::GetParentStyleContextFrame| checks being out
// of flow so that this works correctly.
do {
if (GetPrevContinuationWithSameStyle(outOfFlowFrame)) {
// Later continuations are likely restyled as a result of
// the restyling of the previous continuation.
// (Currently that's always true, but it's likely to
// change if we implement overflow:fragments or similar.)
continue;
}
ElementRestyler oofRestyler(*this, outOfFlowFrame,
FOR_OUT_OF_FLOW_CHILD);
oofRestyler.Restyle(aChildRestyleHint);
} while ((outOfFlowFrame = outOfFlowFrame->GetNextContinuation()));
// reresolve placeholder's context under the same parent
// as the out-of-flow frame
ElementRestyler phRestyler(*this, child, 0);
phRestyler.Restyle(aChildRestyleHint);
}
else { // regular child frame
if (child != mResolvedChild) {
ElementRestyler childRestyler(*this, child, 0);
childRestyler.Restyle(aChildRestyleHint);
}
}
}
}
}
// XXX need to do overflow frames???
}
void
ElementRestyler::SendAccessibilityNotifications()
{
#ifdef ACCESSIBILITY
// Send notifications about visibility changes.
if (mOurA11yNotification == eNotifyShown) {
nsAccessibilityService* accService = nsIPresShell::AccService();
if (accService) {
nsIPresShell* presShell = mFrame->PresContext()->GetPresShell();
nsIContent* content = mFrame->GetContent();
accService->ContentRangeInserted(presShell, content->GetParent(),
content,
content->GetNextSibling());
}
} else if (mOurA11yNotification == eNotifyHidden) {
nsAccessibilityService* accService = nsIPresShell::AccService();
if (accService) {
nsIPresShell* presShell = mFrame->PresContext()->GetPresShell();
nsIContent* content = mFrame->GetContent();
accService->ContentRemoved(presShell, content->GetParent(), content);
// Process children staying shown.
uint32_t visibleContentCount = mVisibleKidsOfHiddenElement.Length();
for (uint32_t idx = 0; idx < visibleContentCount; idx++) {
nsIContent* childContent = mVisibleKidsOfHiddenElement[idx];
accService->ContentRangeInserted(presShell, childContent->GetParent(),
childContent,
childContent->GetNextSibling());
}
mVisibleKidsOfHiddenElement.Clear();
}
}
#endif
}
void
RestyleManager::ComputeStyleChangeFor(nsIFrame* aFrame,
nsStyleChangeList* aChangeList,
nsChangeHint aMinChange,
RestyleTracker& aRestyleTracker,
bool aRestyleDescendants)
{
PROFILER_LABEL("CSS", "ComputeStyleChangeFor");
nsIContent *content = aFrame->GetContent();
if (aMinChange) {
aChangeList->AppendChange(aFrame, content, aMinChange);
}
nsIFrame* frame = aFrame;
NS_ASSERTION(!frame->GetPrevContinuation(), "must start with the first in flow");
// We need to handle aFrame and all of its continuations and special
// siblings and their continuations. ReResolveStyleContext loops over
// the continuations, and also loops over the similar-type sequences
// in block-in-inline splits (i.e., either all the blocks or all the
// inlines), so here we only have to advance one step to the other set
// of special siblings (i.e., switch from blocks to inlines, or
// vice-versa).
FramePropertyTable* propTable = mPresContext->PropertyTable();
TreeMatchContext treeMatchContext(true,
nsRuleWalker::eRelevantLinkUnvisited,
mPresContext->Document());
nsIContent *parent = content ? content->GetParent() : nullptr;
Element *parentElement =
parent && parent->IsElement() ? parent->AsElement() : nullptr;
treeMatchContext.InitAncestors(parentElement);
nsTArray<nsIContent*> visibleKidsOfHiddenElement;
for (int ibSet = 0; ibSet < 2; ++ibSet) {
// loop over the two sets (blocks, inlines) of special siblings
ElementRestyler restyler(mPresContext, frame, aChangeList,
aMinChange, aRestyleTracker,
treeMatchContext,
visibleKidsOfHiddenElement);
restyler.Restyle(aRestyleDescendants ? eRestyle_Subtree : eRestyle_Self);
if (restyler.HintsHandledForFrame() & nsChangeHint_ReconstructFrame) {
// If it's going to cause a framechange, then don't bother
// with the continuations or special siblings since they'll be
// clobbered by the frame reconstruct anyway.
NS_ASSERTION(!frame->GetPrevContinuation(),
"continuing frame had more severe impact than first-in-flow");
return;
}
// Might we have special siblings?
if (!(frame->GetStateBits() & NS_FRAME_IS_SPECIAL)) {
// nothing more to do here
return;
}
frame = static_cast<nsIFrame*>
(propTable->Get(frame, nsIFrame::IBSplitSpecialSibling()));
if (!frame) {
return;
}
}
}
} // namespace mozilla
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