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67f83f31cd
FIXME: Adjust for eRestyle_Force if bug 931668 lands first. Later patches will add such types that are like eRestyle_Self but that only replace the style attribute, animation rule, or transition rule.
281 lines
10 KiB
C++
281 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* A class which manages pending restyles. This handles keeping track
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* of what nodes restyles need to happen on and so forth.
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*/
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#include "RestyleTracker.h"
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#include "nsStyleChangeList.h"
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#include "RestyleManager.h"
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#include "GeckoProfiler.h"
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namespace mozilla {
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inline nsIDocument*
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RestyleTracker::Document() const {
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return mRestyleManager->PresContext()->Document();
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}
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#define RESTYLE_ARRAY_STACKSIZE 128
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struct LaterSiblingCollector {
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RestyleTracker* tracker;
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nsTArray< nsRefPtr<dom::Element> >* elements;
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};
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static PLDHashOperator
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CollectLaterSiblings(nsISupports* aElement,
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RestyleTracker::RestyleData& aData,
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void* aSiblingCollector)
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{
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dom::Element* element =
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static_cast<dom::Element*>(aElement);
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LaterSiblingCollector* collector =
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static_cast<LaterSiblingCollector*>(aSiblingCollector);
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// Only collect the entries that actually need restyling by us (and
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// haven't, for example, already been restyled).
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// It's important to not mess with the flags on entries not in our
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// document.
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if (element->GetCrossShadowCurrentDoc() == collector->tracker->Document() &&
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element->HasFlag(collector->tracker->RestyleBit()) &&
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(aData.mRestyleHint & eRestyle_LaterSiblings)) {
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collector->elements->AppendElement(element);
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}
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return PL_DHASH_NEXT;
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}
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struct RestyleCollector {
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RestyleTracker* tracker;
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RestyleTracker::RestyleEnumerateData** restyleArrayPtr;
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};
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static PLDHashOperator
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CollectRestyles(nsISupports* aElement,
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RestyleTracker::RestyleData& aData,
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void* aRestyleCollector)
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{
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dom::Element* element =
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static_cast<dom::Element*>(aElement);
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RestyleCollector* collector =
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static_cast<RestyleCollector*>(aRestyleCollector);
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// Only collect the entries that actually need restyling by us (and
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// haven't, for example, already been restyled).
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// It's important to not mess with the flags on entries not in our
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// document.
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if (element->GetCrossShadowCurrentDoc() != collector->tracker->Document() ||
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!element->HasFlag(collector->tracker->RestyleBit())) {
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return PL_DHASH_NEXT;
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}
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NS_ASSERTION(!element->HasFlag(collector->tracker->RootBit()) ||
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// Maybe we're just not reachable via the frame tree?
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(element->GetFlattenedTreeParent() &&
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(!element->GetFlattenedTreeParent()->GetPrimaryFrame()||
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element->GetFlattenedTreeParent()->GetPrimaryFrame()->IsLeaf())) ||
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// Or not reachable due to an async reinsert we have
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// pending? If so, we'll have a reframe hint around.
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// That incidentally makes it safe that we still have
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// the bit, since any descendants that didn't get added
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// to the roots list because we had the bits will be
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// completely restyled in a moment.
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(aData.mChangeHint & nsChangeHint_ReconstructFrame),
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"Why did this not get handled while processing mRestyleRoots?");
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// Unset the restyle bits now, so if they get readded later as we
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// process we won't clobber that adding of the bit.
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element->UnsetFlags(collector->tracker->RestyleBit() |
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collector->tracker->RootBit());
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RestyleTracker::RestyleEnumerateData** restyleArrayPtr =
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collector->restyleArrayPtr;
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RestyleTracker::RestyleEnumerateData* currentRestyle =
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*restyleArrayPtr;
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currentRestyle->mElement = element;
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currentRestyle->mRestyleHint = aData.mRestyleHint;
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currentRestyle->mChangeHint = aData.mChangeHint;
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// Increment to the next slot in the array
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*restyleArrayPtr = currentRestyle + 1;
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return PL_DHASH_NEXT;
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}
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inline void
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RestyleTracker::ProcessOneRestyle(Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aChangeHint)
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{
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NS_PRECONDITION((aRestyleHint & eRestyle_LaterSiblings) == 0,
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"Someone should have handled this before calling us");
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NS_PRECONDITION(Document(), "Must have a document");
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NS_PRECONDITION(aElement->GetCrossShadowCurrentDoc() == Document(),
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"Element has unexpected document");
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nsIFrame* primaryFrame = aElement->GetPrimaryFrame();
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if (aRestyleHint & ~eRestyle_LaterSiblings) {
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mRestyleManager->RestyleElement(aElement, primaryFrame, aChangeHint,
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*this, aRestyleHint);
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} else if (aChangeHint &&
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(primaryFrame ||
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(aChangeHint & nsChangeHint_ReconstructFrame))) {
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// Don't need to recompute style; just apply the hint
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nsStyleChangeList changeList;
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changeList.AppendChange(primaryFrame, aElement, aChangeHint);
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mRestyleManager->ProcessRestyledFrames(changeList);
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}
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}
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void
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RestyleTracker::DoProcessRestyles()
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{
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PROFILER_LABEL("RestyleTracker", "ProcessRestyles",
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js::ProfileEntry::Category::CSS);
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mRestyleManager->BeginProcessingRestyles();
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// loop so that we process any restyle events generated by processing
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while (mPendingRestyles.Count()) {
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if (mHaveLaterSiblingRestyles) {
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// Convert them to individual restyles on all the later siblings
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nsAutoTArray<nsRefPtr<Element>, RESTYLE_ARRAY_STACKSIZE> laterSiblingArr;
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LaterSiblingCollector siblingCollector = { this, &laterSiblingArr };
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mPendingRestyles.Enumerate(CollectLaterSiblings, &siblingCollector);
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for (uint32_t i = 0; i < laterSiblingArr.Length(); ++i) {
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Element* element = laterSiblingArr[i];
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for (nsIContent* sibling = element->GetNextSibling();
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sibling;
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sibling = sibling->GetNextSibling()) {
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if (sibling->IsElement() &&
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AddPendingRestyle(sibling->AsElement(), eRestyle_Subtree,
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NS_STYLE_HINT_NONE)) {
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// Nothing else to do here; we'll handle the following
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// siblings when we get to |sibling| in laterSiblingArr.
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break;
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}
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}
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}
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// Now remove all those eRestyle_LaterSiblings bits
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for (uint32_t i = 0; i < laterSiblingArr.Length(); ++i) {
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Element* element = laterSiblingArr[i];
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NS_ASSERTION(element->HasFlag(RestyleBit()), "How did that happen?");
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RestyleData data;
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#ifdef DEBUG
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bool found =
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#endif
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mPendingRestyles.Get(element, &data);
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NS_ASSERTION(found, "Where did our entry go?");
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data.mRestyleHint =
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nsRestyleHint(data.mRestyleHint & ~eRestyle_LaterSiblings);
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mPendingRestyles.Put(element, data);
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}
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mHaveLaterSiblingRestyles = false;
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}
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uint32_t rootCount;
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while ((rootCount = mRestyleRoots.Length())) {
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// Make sure to pop the element off our restyle root array, so
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// that we can freely append to the array as we process this
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// element.
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nsRefPtr<Element> element;
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element.swap(mRestyleRoots[rootCount - 1]);
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mRestyleRoots.RemoveElementAt(rootCount - 1);
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// Do the document check before calling GetRestyleData, since we
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// don't want to do the sibling-processing GetRestyleData does if
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// the node is no longer relevant.
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if (element->GetCrossShadowCurrentDoc() != Document()) {
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// Content node has been removed from our document; nothing else
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// to do here
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continue;
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}
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RestyleData data;
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if (!GetRestyleData(element, &data)) {
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continue;
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}
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ProcessOneRestyle(element, data.mRestyleHint, data.mChangeHint);
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}
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if (mHaveLaterSiblingRestyles) {
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// Keep processing restyles for now
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continue;
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}
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// Now we only have entries with change hints left. To be safe in
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// case of reentry from the handing of the change hint, use a
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// scratch array instead of calling out to ProcessOneRestyle while
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// enumerating the hashtable. Use the stack if we can, otherwise
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// fall back on heap-allocation.
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nsAutoTArray<RestyleEnumerateData, RESTYLE_ARRAY_STACKSIZE> restyleArr;
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RestyleEnumerateData* restylesToProcess =
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restyleArr.AppendElements(mPendingRestyles.Count());
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if (restylesToProcess) {
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RestyleEnumerateData* lastRestyle = restylesToProcess;
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RestyleCollector collector = { this, &lastRestyle };
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mPendingRestyles.Enumerate(CollectRestyles, &collector);
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// Clear the hashtable now that we don't need it anymore
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mPendingRestyles.Clear();
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for (RestyleEnumerateData* currentRestyle = restylesToProcess;
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currentRestyle != lastRestyle;
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++currentRestyle) {
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ProcessOneRestyle(currentRestyle->mElement,
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currentRestyle->mRestyleHint,
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currentRestyle->mChangeHint);
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}
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}
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}
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mRestyleManager->EndProcessingRestyles();
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}
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bool
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RestyleTracker::GetRestyleData(Element* aElement, RestyleData* aData)
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{
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NS_PRECONDITION(aElement->GetCrossShadowCurrentDoc() == Document(),
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"Unexpected document; this will lead to incorrect behavior!");
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if (!aElement->HasFlag(RestyleBit())) {
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NS_ASSERTION(!aElement->HasFlag(RootBit()), "Bogus root bit?");
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return false;
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}
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#ifdef DEBUG
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bool gotData =
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#endif
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mPendingRestyles.Get(aElement, aData);
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NS_ASSERTION(gotData, "Must have data if restyle bit is set");
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if (aData->mRestyleHint & eRestyle_LaterSiblings) {
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// Someone readded the eRestyle_LaterSiblings hint for this
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// element. Leave it around for now, but remove the other restyle
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// hints and the change hint for it. Also unset its root bit,
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// since it's no longer a root with the new restyle data.
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RestyleData newData;
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newData.mChangeHint = nsChangeHint(0);
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newData.mRestyleHint = eRestyle_LaterSiblings;
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mPendingRestyles.Put(aElement, newData);
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aElement->UnsetFlags(RootBit());
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aData->mRestyleHint =
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nsRestyleHint(aData->mRestyleHint & ~eRestyle_LaterSiblings);
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} else {
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mPendingRestyles.Remove(aElement);
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aElement->UnsetFlags(mRestyleBits);
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}
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return true;
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}
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} // namespace mozilla
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