зеркало из https://github.com/mozilla/gecko-dev.git
662 строки
24 KiB
C++
662 строки
24 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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* Code responsible for managing style changes: tracking what style
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* changes need to happen, scheduling them, and doing them.
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*/
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#ifndef mozilla_RestyleManager_h
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#define mozilla_RestyleManager_h
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#include "mozilla/RestyleLogging.h"
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#include "nsISupportsImpl.h"
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#include "nsChangeHint.h"
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#include "RestyleTracker.h"
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#include "nsPresContext.h"
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#include "nsRefreshDriver.h"
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#include "nsRefPtrHashtable.h"
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#include "nsCSSPseudoElements.h"
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class nsIFrame;
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class nsStyleChangeList;
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struct TreeMatchContext;
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namespace mozilla {
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class EventStates;
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namespace dom {
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class Element;
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} // namespace dom
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class RestyleManager MOZ_FINAL {
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public:
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friend class ::nsRefreshDriver;
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friend class RestyleTracker;
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typedef mozilla::dom::Element Element;
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explicit RestyleManager(nsPresContext* aPresContext);
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private:
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// Private destructor, to discourage deletion outside of Release():
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~RestyleManager()
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{
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MOZ_ASSERT(!mReframingStyleContexts,
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"temporary member should be nulled out before destruction");
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}
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public:
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NS_INLINE_DECL_REFCOUNTING(mozilla::RestyleManager)
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void Disconnect() {
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mPresContext = nullptr;
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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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// 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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// Forwarded nsIDocumentObserver method, to handle restyling (and
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// passing the notification to the frame).
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nsresult ContentStateChanged(nsIContent* aContent,
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EventStates aStateMask);
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// Forwarded nsIMutationObserver method, to handle restyling.
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void AttributeWillChange(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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// Forwarded nsIMutationObserver method, to handle restyling (and
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// passing the notification to the frame).
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void AttributeChanged(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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// 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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// 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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// Whether rule matching should skip styles associated with animation
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bool SkipAnimationRules() const {
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MOZ_ASSERT(mSkipAnimationRules || !mPostAnimationRestyles,
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"inconsistent state");
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return mSkipAnimationRules;
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}
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// Whether rule matching should post animation restyles when it skips
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// styles associated with animation. Only true when
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// SkipAnimationRules() is also true.
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bool PostAnimationRestyles() const {
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MOZ_ASSERT(mSkipAnimationRules || !mPostAnimationRestyles,
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"inconsistent state");
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return mPostAnimationRestyles;
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}
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// Whether we're currently in the animation phase of restyle
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// processing (to be eliminated in bug 960465)
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bool IsProcessingAnimationStyleChange() const {
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return mIsProcessingAnimationStyleChange;
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}
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/**
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* Reparent the style contexts of this frame subtree. The parent frame of
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* aFrame must be changed to the new parent before this function is called;
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* the new parent style context will be automatically computed based on the
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* new position in the frame tree.
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*
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* @param aFrame the root of the subtree to reparent. Must not be null.
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*/
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nsresult ReparentStyleContext(nsIFrame* aFrame);
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private:
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void ComputeAndProcessStyleChange(nsIFrame* aFrame,
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nsChangeHint aMinChange,
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RestyleTracker& aRestyleTracker,
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nsRestyleHint aRestyleHint);
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/**
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* Re-resolve the style contexts for a frame tree, building
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* aChangeList based on the resulting style changes, plus aMinChange
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* applied to aFrame.
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*/
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void
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ComputeStyleChangeFor(nsIFrame* aFrame,
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nsStyleChangeList* aChangeList,
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nsChangeHint aMinChange,
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RestyleTracker& aRestyleTracker,
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nsRestyleHint aRestyleHint);
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public:
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#ifdef DEBUG
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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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// 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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nsresult ProcessRestyledFrames(nsStyleChangeList& aRestyleArray);
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/**
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* In order to start CSS transitions on elements that are being
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* reframed, we need to stash their style contexts somewhere during
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* the reframing process.
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*
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* In all cases, the content node in the hash table is the real
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* content node, not the anonymous content node we create for ::before
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* or ::after. The content node passed to the Get and Put methods is,
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* however, the content node to be associate with the frame's style
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* context.
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*/
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typedef nsRefPtrHashtable<nsRefPtrHashKey<nsIContent>, nsStyleContext>
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ReframingStyleContextTable;
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class ReframingStyleContexts {
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public:
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void Put(nsIContent* aContent, nsStyleContext* aStyleContext) {
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MOZ_ASSERT(aContent);
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nsCSSPseudoElements::Type pseudoType = aStyleContext->GetPseudoType();
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if (pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) {
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mElementContexts.Put(aContent, aStyleContext);
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} else if (pseudoType == nsCSSPseudoElements::ePseudo_before) {
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MOZ_ASSERT(aContent->Tag() == nsGkAtoms::mozgeneratedcontentbefore);
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mBeforePseudoContexts.Put(aContent->GetParent(), aStyleContext);
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} else if (pseudoType == nsCSSPseudoElements::ePseudo_after) {
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MOZ_ASSERT(aContent->Tag() == nsGkAtoms::mozgeneratedcontentafter);
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mAfterPseudoContexts.Put(aContent->GetParent(), aStyleContext);
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}
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}
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nsStyleContext* Get(nsIContent* aContent,
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nsCSSPseudoElements::Type aPseudoType) {
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MOZ_ASSERT(aContent);
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if (aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) {
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return mElementContexts.GetWeak(aContent);
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}
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if (aPseudoType == nsCSSPseudoElements::ePseudo_before) {
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MOZ_ASSERT(aContent->Tag() == nsGkAtoms::mozgeneratedcontentbefore);
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return mBeforePseudoContexts.GetWeak(aContent->GetParent());
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}
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if (aPseudoType == nsCSSPseudoElements::ePseudo_after) {
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MOZ_ASSERT(aContent->Tag() == nsGkAtoms::mozgeneratedcontentafter);
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return mAfterPseudoContexts.GetWeak(aContent->GetParent());
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}
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MOZ_ASSERT(false, "unexpected aPseudoType");
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return nullptr;
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}
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private:
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ReframingStyleContextTable mElementContexts;
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ReframingStyleContextTable mBeforePseudoContexts;
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ReframingStyleContextTable mAfterPseudoContexts;
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};
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/**
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* Return the current ReframingStyleContexts struct, or null if we're
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* not currently in a restyling operation.
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*/
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ReframingStyleContexts* GetReframingStyleContexts() {
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return mReframingStyleContexts;
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}
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/**
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* Try starting a transition for an element or a ::before or ::after
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* pseudo-element, given an old and new style context. This may
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* change the new style context if a transition is started.
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*
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* For the pseudo-elements, aContent must be the anonymous content
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* that we're creating for that pseudo-element, not the real element.
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*/
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static void
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TryStartingTransition(nsPresContext* aPresContext, nsIContent* aContent,
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nsStyleContext* aOldStyleContext,
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nsRefPtr<nsStyleContext>* aNewStyleContext /* inout */);
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private:
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void RestyleForEmptyChange(Element* aContainer);
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public:
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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(Element* aContainer, nsIContent* aChild);
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// This would be the same 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 RestyleForRemove(Element* aContainer,
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nsIContent* aOldChild,
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nsIContent* aFollowingSibling);
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// Same for a ContentAppended. |aContainer| must be non-null; when
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// the container is null, no work is needed.
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void RestyleForAppend(Element* aContainer, nsIContent* aFirstNewContent);
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// Process any pending restyles. This should be called after
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// CreateNeededFrames.
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// Note: It's the caller's responsibility to make sure to wrap a
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// ProcessPendingRestyles 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 ProcessPendingRestyles();
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// Returns whether there are any pending restyles.
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bool HasPendingRestyles() { return mPendingRestyles.Count() != 0; }
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// ProcessPendingRestyles calls into one of our RestyleTracker
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// objects. It then calls back to these functions at the beginning
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// and end of its work.
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void BeginProcessingRestyles();
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void EndProcessingRestyles();
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// Update styles for animations that are running on the compositor and
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// whose updating is suppressed on the main thread (to save
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// unnecessary work), while leaving all other aspects of style
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// out-of-date.
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//
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// Performs an animation-only style flush to make styles from
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// throttled transitions up-to-date prior to processing an unrelated
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// style change, so that any transitions triggered by that style
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// change produce correct results.
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//
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// In more detail: when we're able to run animations on the
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// compositor, we sometimes "throttle" these animations by skipping
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// updating style data on the main thread. However, whenever we
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// process a normal (non-animation) style change, any changes in
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// computed style on elements that have transition-* properties set
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// may need to trigger new transitions; this process requires knowing
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// both the old and new values of the property. To do this correctly,
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// we need to have an up-to-date *old* value of the property on the
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// primary frame. So the purpose of the mini-flush is to update the
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// style for all throttled transitions and animations to the current
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// animation state without making any other updates, so that when we
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// process the queued style updates we'll have correct old data to
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// compare against. When we do this, we don't bother touching frames
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// other than primary frames.
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void UpdateOnlyAnimationStyles();
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bool ThrottledAnimationStyleIsUpToDate() const {
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return mLastUpdateForThrottledAnimations ==
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mPresContext->RefreshDriver()->MostRecentRefresh();
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}
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// Rebuilds all style data by throwing out the old rule tree and
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// building a new one, and additionally applying aExtraHint (which
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// must not contain nsChangeHint_ReconstructFrame) to the root frame.
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void RebuildAllStyleData(nsChangeHint aExtraHint);
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// Helper that does part of the work of RebuildAllStyleData, shared by
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// RestyleElement for 'rem' handling.
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void DoRebuildAllStyleData(RestyleTracker& aRestyleTracker,
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nsChangeHint aExtraHint,
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nsRestyleHint aRestyleHint);
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// See PostRestyleEventCommon below.
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void PostRestyleEvent(Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aMinChangeHint)
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{
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if (mPresContext) {
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PostRestyleEventCommon(aElement, aRestyleHint, aMinChangeHint,
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IsProcessingAnimationStyleChange());
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}
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}
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// See PostRestyleEventCommon below.
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void PostAnimationRestyleEvent(Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aMinChangeHint)
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{
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PostRestyleEventCommon(aElement, aRestyleHint, aMinChangeHint, true);
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}
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void PostRestyleEventForLazyConstruction()
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{
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PostRestyleEventInternal(true);
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}
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void FlushOverflowChangedTracker()
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{
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mOverflowChangedTracker.Flush();
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}
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#ifdef DEBUG
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static nsCString RestyleHintToString(nsRestyleHint aHint);
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static nsCString ChangeHintToString(nsChangeHint aHint);
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#endif
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private:
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/**
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* Notify the frame constructor that an element needs to have its
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* style recomputed.
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* @param aElement: The element to be restyled.
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* @param aRestyleHint: Which nodes need to have selector matching run
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* on them.
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* @param aMinChangeHint: A minimum change hint for aContent and its
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* descendants.
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* @param aForAnimation: Whether the style should be computed with or
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* without animation data. Animation code
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* sometimes needs to pass true; other code
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* should generally pass the the pres context's
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* IsProcessingAnimationStyleChange() value
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* (which is the default value).
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*/
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void PostRestyleEventCommon(Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aMinChangeHint,
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bool aForAnimation);
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void PostRestyleEventInternal(bool aForLazyConstruction);
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public:
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/**
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* Asynchronously clear style data from the root frame downwards and ensure
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* it will all be rebuilt. This is safe to call anytime; it will schedule
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* a restyle and take effect next time style changes are flushed.
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* This method is used to recompute the style data when some change happens
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* outside of any style rules, like a color preference change or a change
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* in a system font size, or to fix things up when an optimization in the
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* style data has become invalid. We assume that the root frame will not
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* need to be reframed.
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*/
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void PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint);
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#ifdef RESTYLE_LOGGING
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/**
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* Returns whether a restyle event currently being processed by this
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* RestyleManager should be logged.
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*/
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bool ShouldLogRestyle() {
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return ShouldLogRestyle(mPresContext);
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}
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/**
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* Returns whether a restyle event currently being processed for the
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* document with the specified nsPresContext should be logged.
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*/
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static bool ShouldLogRestyle(nsPresContext* aPresContext) {
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return aPresContext->RestyleLoggingEnabled() &&
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(!aPresContext->RestyleManager()->
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IsProcessingAnimationStyleChange() ||
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AnimationRestyleLoggingEnabled());
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}
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static bool RestyleLoggingInitiallyEnabled() {
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static bool enabled = getenv("MOZ_DEBUG_RESTYLE") != 0;
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return enabled;
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}
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static bool AnimationRestyleLoggingEnabled() {
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static bool animations = getenv("MOZ_DEBUG_RESTYLE_ANIMATIONS") != 0;
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return animations;
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}
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// Set MOZ_DEBUG_RESTYLE_STRUCTS to a comma-separated string of
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// style struct names -- such as "Font,SVGReset" -- to log the style context
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// tree and those cached struct pointers before each restyle. This
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// function returns a bitfield of the structs named in the
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// environment variable.
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static uint32_t StructsToLog();
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static nsCString StructNamesToString(uint32_t aSIDs);
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int32_t& LoggingDepth() { return mLoggingDepth; }
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#endif
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private:
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/* aMinHint is the minimal change that should be made to the element */
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// XXXbz do we really need the aPrimaryFrame argument here?
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void RestyleElement(Element* aElement,
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nsIFrame* aPrimaryFrame,
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nsChangeHint aMinHint,
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RestyleTracker& aRestyleTracker,
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nsRestyleHint aRestyleHint);
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void StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint);
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// Recursively add all the given frame and all children to the tracker.
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void AddSubtreeToOverflowTracker(nsIFrame* aFrame);
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// Returns true if this function managed to successfully move a frame, and
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// false if it could not process the position change, and a reflow should
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// be performed instead.
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bool RecomputePosition(nsIFrame* aFrame);
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private:
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nsPresContext* mPresContext; // weak, disconnected in Disconnect
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bool mRebuildAllStyleData : 1;
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// True if we're already waiting for a refresh notification
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bool mObservingRefreshDriver : 1;
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// True if we're in the middle of a nsRefreshDriver refresh
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bool mInStyleRefresh : 1;
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// Whether rule matching should skip styles associated with animation
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bool mSkipAnimationRules : 1;
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// Whether rule matching should post animation restyles when it skips
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// styles associated with animation. Only true when
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// mSkipAnimationRules is also true.
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bool mPostAnimationRestyles : 1;
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// Whether we're currently in the animation phase of restyle
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// processing (to be eliminated in bug 960465)
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bool mIsProcessingAnimationStyleChange : 1;
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uint32_t mHoverGeneration;
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nsChangeHint mRebuildAllExtraHint;
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mozilla::TimeStamp mLastUpdateForThrottledAnimations;
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OverflowChangedTracker mOverflowChangedTracker;
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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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ReframingStyleContexts* mReframingStyleContexts;
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RestyleTracker mPendingRestyles;
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RestyleTracker mPendingAnimationRestyles;
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#ifdef DEBUG
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bool mIsProcessingRestyles;
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#endif
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#ifdef RESTYLE_LOGGING
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int32_t mLoggingDepth;
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#endif
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};
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/**
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* An ElementRestyler is created for *each* element in a subtree that we
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* recompute styles for.
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*/
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class ElementRestyler MOZ_FINAL {
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public:
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typedef mozilla::dom::Element Element;
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|
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// Construct for the root of the subtree that we're restyling.
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ElementRestyler(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsStyleChangeList* aChangeList,
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nsChangeHint aHintsHandledByAncestors,
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RestyleTracker& aRestyleTracker,
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TreeMatchContext& aTreeMatchContext,
|
|
nsTArray<nsIContent*>& aVisibleKidsOfHiddenElement);
|
|
|
|
// Construct for an element whose parent is being restyled.
|
|
enum ConstructorFlags {
|
|
FOR_OUT_OF_FLOW_CHILD = 1<<0
|
|
};
|
|
ElementRestyler(const ElementRestyler& aParentRestyler,
|
|
nsIFrame* aFrame,
|
|
uint32_t aConstructorFlags);
|
|
|
|
// Construct for a frame whose parent is being restyled, but whose
|
|
// style context is the parent style context for its parent frame.
|
|
// (This is only used for table frames, whose style contexts are used
|
|
// as the parent style context for their outer table frame (table
|
|
// wrapper frame). We should probably try to get rid of this
|
|
// exception and have the inheritance go the other way.)
|
|
enum ParentContextFromChildFrame { PARENT_CONTEXT_FROM_CHILD_FRAME };
|
|
ElementRestyler(ParentContextFromChildFrame,
|
|
const ElementRestyler& aParentFrameRestyler,
|
|
nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Restyle our frame's element and its subtree.
|
|
*
|
|
* Use eRestyle_Self for the aRestyleHint argument to mean
|
|
* "reresolve our style context but not kids", use eRestyle_Subtree
|
|
* to mean "reresolve our style context and kids", and use
|
|
* nsRestyleHint(0) to mean recompute a new style context for our
|
|
* current parent and existing rulenode, and the same for kids.
|
|
*/
|
|
void Restyle(nsRestyleHint aRestyleHint);
|
|
|
|
/**
|
|
* mHintsHandled changes over time; it starts off as the hints that
|
|
* have been handled by ancestors, and by the end of Restyle it
|
|
* represents the hints that have been handled for this frame. This
|
|
* method is intended to be called after Restyle, to find out what
|
|
* hints have been handled for this frame.
|
|
*/
|
|
nsChangeHint HintsHandledForFrame() { return mHintsHandled; }
|
|
|
|
#ifdef RESTYLE_LOGGING
|
|
bool ShouldLogRestyle() {
|
|
return RestyleManager::ShouldLogRestyle(mPresContext);
|
|
}
|
|
#endif
|
|
|
|
private:
|
|
// Enum for the result of RestyleSelf, which indicates whether the
|
|
// restyle procedure should continue to the children, and how.
|
|
//
|
|
// These values must be ordered so that later values imply that all
|
|
// the work of the earlier values is also done.
|
|
enum RestyleResult {
|
|
|
|
// do not restyle children
|
|
eRestyleResult_Stop = 1,
|
|
|
|
// continue restyling children
|
|
eRestyleResult_Continue,
|
|
|
|
// continue restyling children with eRestyle_ForceDescendants set
|
|
eRestyleResult_ContinueAndForceDescendants
|
|
};
|
|
|
|
/**
|
|
* First half of Restyle().
|
|
*/
|
|
RestyleResult RestyleSelf(nsIFrame* aSelf,
|
|
nsRestyleHint aRestyleHint,
|
|
uint32_t* aSwappedStructs);
|
|
|
|
/**
|
|
* Restyle the children of this frame (and, in turn, their children).
|
|
*
|
|
* Second half of Restyle().
|
|
*/
|
|
void RestyleChildren(nsRestyleHint aChildRestyleHint);
|
|
|
|
/**
|
|
* Helpers for RestyleSelf().
|
|
*/
|
|
void CaptureChange(nsStyleContext* aOldContext,
|
|
nsStyleContext* aNewContext,
|
|
nsChangeHint aChangeToAssume,
|
|
uint32_t* aEqualStructs);
|
|
RestyleResult ComputeRestyleResultFromFrame(nsIFrame* aSelf);
|
|
RestyleResult ComputeRestyleResultFromNewContext(nsIFrame* aSelf,
|
|
nsStyleContext* aNewContext);
|
|
|
|
/**
|
|
* Helpers for RestyleChildren().
|
|
*/
|
|
void RestyleUndisplayedChildren(nsRestyleHint aChildRestyleHint);
|
|
void MaybeReframeForBeforePseudo();
|
|
void MaybeReframeForAfterPseudo(nsIFrame* aFrame);
|
|
void RestyleContentChildren(nsIFrame* aParent,
|
|
nsRestyleHint aChildRestyleHint);
|
|
void InitializeAccessibilityNotifications();
|
|
void SendAccessibilityNotifications();
|
|
|
|
enum DesiredA11yNotifications {
|
|
eSkipNotifications,
|
|
eSendAllNotifications,
|
|
eNotifyIfShown
|
|
};
|
|
|
|
enum A11yNotificationType {
|
|
eDontNotify,
|
|
eNotifyShown,
|
|
eNotifyHidden
|
|
};
|
|
|
|
#ifdef RESTYLE_LOGGING
|
|
int32_t& LoggingDepth() { return mLoggingDepth; }
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
static nsCString RestyleResultToString(RestyleResult aRestyleResult);
|
|
#endif
|
|
|
|
private:
|
|
nsPresContext* const mPresContext;
|
|
nsIFrame* const mFrame;
|
|
nsIContent* const mParentContent;
|
|
// |mContent| is the node that we used for rule matching of
|
|
// normal elements (not pseudo-elements) and for which we generate
|
|
// framechange hints if we need them.
|
|
nsIContent* const mContent;
|
|
nsStyleChangeList* const mChangeList;
|
|
// We have already generated change list entries for hints listed in
|
|
// mHintsHandled (initially it's those handled by ancestors, but by
|
|
// the end of Restyle it is those handled for this frame as well). We
|
|
// need to generate a new change list entry for the frame when its
|
|
// style comparision returns a hint other than one of these hints.
|
|
nsChangeHint mHintsHandled;
|
|
// See nsStyleContext::CalcStyleDifference
|
|
nsChangeHint mParentFrameHintsNotHandledForDescendants;
|
|
nsChangeHint mHintsNotHandledForDescendants;
|
|
RestyleTracker& mRestyleTracker;
|
|
TreeMatchContext& mTreeMatchContext;
|
|
nsIFrame* mResolvedChild; // child that provides our parent style context
|
|
|
|
#ifdef ACCESSIBILITY
|
|
const DesiredA11yNotifications mDesiredA11yNotifications;
|
|
DesiredA11yNotifications mKidsDesiredA11yNotifications;
|
|
A11yNotificationType mOurA11yNotification;
|
|
nsTArray<nsIContent*>& mVisibleKidsOfHiddenElement;
|
|
bool mWasFrameVisible;
|
|
#endif
|
|
|
|
#ifdef RESTYLE_LOGGING
|
|
int32_t mLoggingDepth;
|
|
#endif
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_RestyleManager_h */
|