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305 lines
11 KiB
C++
305 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#ifndef mozilla_RestyleManager_h
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#define mozilla_RestyleManager_h
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#include "mozilla/OverflowChangedTracker.h"
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#include "nsChangeHint.h"
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#include "nsPresContext.h"
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class nsCString;
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class nsCSSFrameConstructor;
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class nsStyleChangeList;
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namespace mozilla {
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class EventStates;
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class GeckoRestyleManager;
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class ServoRestyleManager;
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namespace dom {
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class Element;
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}
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/**
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* Class for sharing data and logic common to both GeckoRestyleManager and
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* ServoRestyleManager.
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*/
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class RestyleManager
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{
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public:
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typedef mozilla::dom::Element Element;
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NS_INLINE_DECL_REFCOUNTING(mozilla::RestyleManager)
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// Get an integer that increments every time we process pending restyles.
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// The value is never 0.
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uint32_t GetRestyleGeneration() const { return mRestyleGeneration; }
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// Get an integer that increments every time there is a style change
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// as a result of a change to the :hover content state.
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uint32_t GetHoverGeneration() const { return mHoverGeneration; }
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void Disconnect() { mPresContext = nullptr; }
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static nsCString RestyleHintToString(nsRestyleHint aHint);
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#ifdef DEBUG
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static nsCString ChangeHintToString(nsChangeHint aHint);
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/**
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* DEBUG ONLY method to verify integrity of style tree versus frame tree
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*/
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void DebugVerifyStyleTree(nsIFrame* aFrame);
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#endif
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void FlushOverflowChangedTracker() {
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mOverflowChangedTracker.Flush();
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}
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// Should be called when a frame is going to be destroyed and
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// WillDestroyFrameTree hasn't been called yet.
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void NotifyDestroyingFrame(nsIFrame* aFrame) {
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mOverflowChangedTracker.RemoveFrame(aFrame);
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// If ProcessRestyledFrames is tracking frames which have been
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// destroyed (to avoid re-visiting them), add this one to its set.
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if (mDestroyedFrames) {
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mDestroyedFrames->PutEntry(aFrame);
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}
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}
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// Note: It's the caller's responsibility to make sure to wrap a
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// ProcessRestyledFrames call in a view update batch and a script blocker.
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// This function does not call ProcessAttachedQueue() on the binding manager.
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// If the caller wants that to happen synchronously, it needs to handle that
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// itself.
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void ProcessRestyledFrames(nsStyleChangeList& aChangeList);
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bool IsInStyleRefresh() const { return mInStyleRefresh; }
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// AnimationsWithDestroyedFrame is used to stop animations and transitions
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// on elements that have no frame at the end of the restyling process.
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// It only lives during the restyling process.
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class MOZ_STACK_CLASS AnimationsWithDestroyedFrame final {
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public:
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// Construct a AnimationsWithDestroyedFrame object. The caller must
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// ensure that aRestyleManager lives at least as long as the
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// object. (This is generally easy since the caller is typically a
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// method of RestyleManager.)
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explicit AnimationsWithDestroyedFrame(RestyleManager* aRestyleManager);
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// This method takes the content node for the generated content for
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// animation/transition on ::before and ::after, rather than the
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// content node for the real element.
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void Put(nsIContent* aContent, nsStyleContext* aStyleContext) {
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MOZ_ASSERT(aContent);
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CSSPseudoElementType pseudoType = aStyleContext->GetPseudoType();
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if (pseudoType == CSSPseudoElementType::NotPseudo) {
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mContents.AppendElement(aContent);
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} else if (pseudoType == CSSPseudoElementType::before) {
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MOZ_ASSERT(aContent->NodeInfo()->NameAtom() ==
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nsGkAtoms::mozgeneratedcontentbefore);
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mBeforeContents.AppendElement(aContent->GetParent());
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} else if (pseudoType == CSSPseudoElementType::after) {
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MOZ_ASSERT(aContent->NodeInfo()->NameAtom() ==
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nsGkAtoms::mozgeneratedcontentafter);
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mAfterContents.AppendElement(aContent->GetParent());
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}
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}
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void StopAnimationsForElementsWithoutFrames();
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private:
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void StopAnimationsWithoutFrame(nsTArray<RefPtr<nsIContent>>& aArray,
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CSSPseudoElementType aPseudoType);
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RestyleManager* mRestyleManager;
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AutoRestore<AnimationsWithDestroyedFrame*> mRestorePointer;
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// Below three arrays might include elements that have already had their
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// animations or transitions stopped.
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//
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// mBeforeContents and mAfterContents hold the real element rather than
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// the content node for the generated content (which might change during
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// a reframe)
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nsTArray<RefPtr<nsIContent>> mContents;
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nsTArray<RefPtr<nsIContent>> mBeforeContents;
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nsTArray<RefPtr<nsIContent>> mAfterContents;
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};
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/**
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* Return the current AnimationsWithDestroyedFrame struct, or null if we're
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* not currently in a restyling operation.
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*/
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AnimationsWithDestroyedFrame* GetAnimationsWithDestroyedFrame() {
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return mAnimationsWithDestroyedFrame;
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}
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void ContentInserted(nsINode* aContainer, nsIContent* aChild);
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void ContentAppended(nsIContent* aContainer, nsIContent* aFirstNewContent);
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// This would be have the same logic as RestyleForInsertOrChange if we got the
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// notification before the removal. However, we get it after, so we need the
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// following sibling in addition to the old child. |aContainer| must be
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// non-null; when the container is null, no work is needed. aFollowingSibling
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// is the sibling that used to come after aOldChild before the removal.
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void ContentRemoved(nsINode* aContainer,
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nsIContent* aOldChild,
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nsIContent* aFollowingSibling);
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// Restyling for a ContentInserted (notification after insertion) or
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// for a CharacterDataChanged. |aContainer| must be non-null; when
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// the container is null, no work is needed.
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void RestyleForInsertOrChange(nsINode* aContainer, nsIContent* aChild);
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// Restyling for a ContentAppended (notification after insertion) or
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// for a CharacterDataChanged. |aContainer| must be non-null; when
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// the container is null, no work is needed.
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void RestyleForAppend(nsIContent* aContainer, nsIContent* aFirstNewContent);
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MOZ_DECL_STYLO_METHODS(GeckoRestyleManager, ServoRestyleManager)
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inline void PostRestyleEvent(dom::Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aMinChangeHint);
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inline void RebuildAllStyleData(nsChangeHint aExtraHint,
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nsRestyleHint aRestyleHint);
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inline void PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint,
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nsRestyleHint aRestyleHint);
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inline void ProcessPendingRestyles();
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inline void ContentStateChanged(nsIContent* aContent,
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EventStates aStateMask);
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inline void AttributeWillChange(dom::Element* aElement,
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int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType,
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const nsAttrValue* aNewValue);
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inline void AttributeChanged(dom::Element* aElement,
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int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType,
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const nsAttrValue* aOldValue);
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inline nsresult ReparentStyleContext(nsIFrame* aFrame);
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inline void UpdateOnlyAnimationStyles();
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// Get a counter that increments on every style change, that we use to
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// track whether off-main-thread animations are up-to-date.
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uint64_t GetAnimationGeneration() const { return mAnimationGeneration; }
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static uint64_t GetAnimationGenerationForFrame(nsIFrame* aFrame);
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// Update the animation generation count to mark that animation state
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// has changed.
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//
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// This is normally performed automatically by ProcessPendingRestyles
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// but it is also called when we have out-of-band changes to animations
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// such as changes made through the Web Animations API.
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void IncrementAnimationGeneration();
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static void AddLayerChangesForAnimation(nsIFrame* aFrame,
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nsIContent* aContent,
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nsStyleChangeList&
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aChangeListToProcess);
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protected:
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RestyleManager(StyleBackendType aType, nsPresContext* aPresContext);
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virtual ~RestyleManager()
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{
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MOZ_ASSERT(!mAnimationsWithDestroyedFrame,
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"leaving dangling pointers from AnimationsWithDestroyedFrame");
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}
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void RestyleForEmptyChange(Element* aContainer);
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void ContentStateChangedInternal(Element* aElement,
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EventStates aStateMask,
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nsChangeHint* aOutChangeHint,
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nsRestyleHint* aOutRestyleHint);
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bool IsDisconnected() { return mPresContext == nullptr; }
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void IncrementHoverGeneration() {
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++mHoverGeneration;
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}
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void IncrementRestyleGeneration() {
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if (++mRestyleGeneration == 0) {
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// Keep mRestyleGeneration from being 0, since that's what
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// nsPresContext::GetRestyleGeneration returns when it no
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// longer has a RestyleManager.
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++mRestyleGeneration;
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}
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}
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nsPresContext* PresContext() const {
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MOZ_ASSERT(mPresContext);
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return mPresContext;
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}
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nsCSSFrameConstructor* FrameConstructor() const {
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return PresContext()->FrameConstructor();
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}
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private:
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nsPresContext* mPresContext; // weak, can be null after Disconnect().
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uint32_t mRestyleGeneration;
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uint32_t mHoverGeneration;
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// Used to keep track of frames that have been destroyed during
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// ProcessRestyledFrames, so we don't try to touch them again even if
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// they're referenced again later in the changelist.
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mozilla::UniquePtr<nsTHashtable<nsPtrHashKey<const nsIFrame>>> mDestroyedFrames;
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const StyleBackendType mType;
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protected:
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// True if we're in the middle of a nsRefreshDriver refresh
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bool mInStyleRefresh;
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// The total number of animation flushes by this frame constructor.
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// Used to keep the layer and animation manager in sync.
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uint64_t mAnimationGeneration;
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OverflowChangedTracker mOverflowChangedTracker;
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/**
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* These are protected static methods that help with the change hint
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* processing bits of the restyle managers.
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*/
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static nsIFrame*
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GetNearestAncestorFrame(nsIContent* aContent);
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static nsIFrame*
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GetNextBlockInInlineSibling(nsIFrame* aFrame);
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/**
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* Get the next continuation or similar ib-split sibling (assuming
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* block/inline alternation), conditionally on it having the same style.
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*
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* Since this is used when deciding to copy the new style context, it
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* takes as an argument the old style context to check if the style is
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* the same. When it is used in other contexts (i.e., where the next
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* continuation would already have the new style context), the current
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* style context should be passed.
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*/
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static nsIFrame*
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GetNextContinuationWithSameStyle(nsIFrame* aFrame,
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nsStyleContext* aOldStyleContext,
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bool* aHaveMoreContinuations = nullptr);
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AnimationsWithDestroyedFrame* mAnimationsWithDestroyedFrame = nullptr;
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friend class mozilla::GeckoRestyleManager;
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friend class mozilla::ServoRestyleManager;
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};
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} // namespace mozilla
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#endif
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