зеркало из https://github.com/mozilla/gecko-dev.git
761 строка
30 KiB
C++
761 строка
30 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_GeckoRestyleManager_h
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#define mozilla_GeckoRestyleManager_h
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#include "mozilla/RestyleLogging.h"
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#include "mozilla/RestyleManager.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 "nsTransitionManager.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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enum class CSSPseudoElementType : uint8_t;
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class EventStates;
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struct UndisplayedNode;
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namespace dom {
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class Element;
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} // namespace dom
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class GeckoRestyleManager final : public RestyleManager
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{
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public:
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typedef RestyleManager base_type;
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friend class RestyleTracker;
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friend class ElementRestyler;
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explicit GeckoRestyleManager(nsPresContext* aPresContext);
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protected:
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~GeckoRestyleManager() override
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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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// Forwarded nsIDocumentObserver method, to handle restyling (and
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// passing the notification to the frame).
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void 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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const nsAttrValue* aNewValue);
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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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const nsAttrValue* aOldValue);
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// Whether rule matching should skip styles associated with animation
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bool SkipAnimationRules() const { return mSkipAnimationRules; }
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void SetSkipAnimationRules(bool aSkipAnimationRules) {
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mSkipAnimationRules = aSkipAnimationRules;
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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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void ClearSelectors() {
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mPendingRestyles.ClearSelectors();
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}
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void PostRestyleEventForLazyConstruction() { PostRestyleEventInternal(); }
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private:
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void PostRestyleEventInternal();
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// Used when restyling an element with a frame.
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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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const RestyleHintData& aRestyleHintData);
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// Used when restyling a display:contents element.
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void ComputeAndProcessStyleChange(nsStyleContext* aNewContext,
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Element* aElement,
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nsChangeHint aMinChange,
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RestyleTracker& aRestyleTracker,
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nsRestyleHint aRestyleHint,
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const RestyleHintData& aRestyleHintData);
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public:
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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 MOZ_STACK_CLASS ReframingStyleContexts final {
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public:
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/**
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* Construct a ReframingStyleContexts 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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*/
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explicit ReframingStyleContexts(GeckoRestyleManager* aRestyleManager);
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~ReframingStyleContexts();
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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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mElementContexts.Put(aContent, aStyleContext);
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} else if (pseudoType == CSSPseudoElementType::before) {
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MOZ_ASSERT(aContent->NodeInfo()->NameAtom() == nsGkAtoms::mozgeneratedcontentbefore);
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mBeforePseudoContexts.Put(aContent->GetParent(), aStyleContext);
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} else if (pseudoType == CSSPseudoElementType::after) {
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MOZ_ASSERT(aContent->NodeInfo()->NameAtom() == 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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CSSPseudoElementType aPseudoType) {
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MOZ_ASSERT(aContent);
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if (aPseudoType == CSSPseudoElementType::NotPseudo) {
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return mElementContexts.GetWeak(aContent);
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}
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if (aPseudoType == CSSPseudoElementType::before) {
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MOZ_ASSERT(aContent->NodeInfo()->NameAtom() == nsGkAtoms::mozgeneratedcontentbefore);
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return mBeforePseudoContexts.GetWeak(aContent->GetParent());
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}
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if (aPseudoType == CSSPseudoElementType::after) {
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MOZ_ASSERT(aContent->NodeInfo()->NameAtom() == 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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GeckoRestyleManager* mRestyleManager;
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AutoRestore<ReframingStyleContexts*> mRestorePointer;
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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 initiating 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. Returns
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* true if it does change aNewStyleContext.
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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 bool
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TryInitiatingTransition(nsPresContext* aPresContext, nsIContent* aContent,
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nsStyleContext* aOldStyleContext,
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RefPtr<nsStyleContext>* aNewStyleContext /* inout */);
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public:
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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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private:
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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(RestyleTracker& aRestyleTracker);
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void EndProcessingRestyles();
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public:
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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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// 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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//
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// aRestyleHint says which restyle hint to use for the computation;
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// the only sensible values to use are eRestyle_Subtree (which says
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// that the rebuild must run selector matching) and nsRestyleHint(0)
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// (which says that rerunning selector matching is not required. (The
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// method adds eRestyle_ForceDescendants internally, and including it
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// in the restyle hint is harmless; some callers (e.g.,
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// nsPresContext::MediaFeatureValuesChanged) might do this for their
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// own reasons.)
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void RebuildAllStyleData(nsChangeHint aExtraHint,
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nsRestyleHint aRestyleHint);
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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 aRestyleHintData: Additional data to go with aRestyleHint.
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*/
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void PostRestyleEvent(Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aMinChangeHint,
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const RestyleHintData* aRestyleHintData = nullptr);
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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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* For parameters, see RebuildAllStyleData.
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*/
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void PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint,
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nsRestyleHint aRestyleHint);
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#ifdef DEBUG
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bool InRebuildAllStyleData() const { return mInRebuildAllStyleData; }
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#endif
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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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* GeckoRestyleManager should be logged.
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*/
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bool ShouldLogRestyle() {
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return ShouldLogRestyle(PresContext());
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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->TransitionManager()->
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InAnimationOnlyStyleUpdate() ||
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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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bool IsProcessingRestyles() { return mIsProcessingRestyles; }
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private:
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inline nsStyleSet* StyleSet() const {
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MOZ_ASSERT(PresContext()->StyleSet()->IsGecko(),
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"GeckoRestyleManager should only be used with a Gecko-flavored "
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"style backend");
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return PresContext()->StyleSet()->AsGecko();
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}
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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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const RestyleHintData& aRestyleHintData);
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void StartRebuildAllStyleData(RestyleTracker& aRestyleTracker);
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void FinishRebuildAllStyleData();
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bool ShouldStartRebuildAllFor(RestyleTracker& aRestyleTracker) {
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// When we process our primary restyle tracker and we have a pending
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// rebuild-all, we need to process it.
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return mDoRebuildAllStyleData &&
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&aRestyleTracker == &mPendingRestyles;
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}
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void ProcessRestyles(RestyleTracker& aRestyleTracker) {
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// Fast-path the common case (esp. for the animation restyle
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// tracker) of not having anything to do.
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if (aRestyleTracker.Count() || ShouldStartRebuildAllFor(aRestyleTracker)) {
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IncrementRestyleGeneration();
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aRestyleTracker.DoProcessRestyles();
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}
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}
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private:
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// True if we need to reconstruct the rule tree the next time we
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// process restyles.
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bool mDoRebuildAllStyleData : 1;
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// True if we're currently in the process of reconstructing the rule tree.
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bool mInRebuildAllStyleData : 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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bool mHavePendingNonAnimationRestyles : 1;
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nsChangeHint mRebuildAllExtraHint;
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nsRestyleHint mRebuildAllRestyleHint;
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ReframingStyleContexts* mReframingStyleContexts;
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RestyleTracker mPendingRestyles;
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// Are we currently in the middle of a call to ProcessRestyles?
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// This flag is used both as a debugging aid to assert that we are not
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// performing nested calls to ProcessPendingRestyles, as well as to ignore
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// redundant calls to IncrementAnimationGeneration.
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bool mIsProcessingRestyles;
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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 final
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{
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public:
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typedef mozilla::dom::Element Element;
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struct ContextToClear {
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RefPtr<nsStyleContext> mStyleContext;
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uint32_t mStructs;
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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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nsTArray<nsCSSSelector*>& aSelectorsForDescendants,
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TreeMatchContext& aTreeMatchContext,
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nsTArray<nsIContent*>& aVisibleKidsOfHiddenElement,
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nsTArray<ContextToClear>& aContextsToClear,
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nsTArray<RefPtr<nsStyleContext>>& aSwappedStructOwners);
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// Construct for an element whose parent is being restyled.
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enum ConstructorFlags {
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FOR_OUT_OF_FLOW_CHILD = 1<<0
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};
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ElementRestyler(const ElementRestyler& aParentRestyler,
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nsIFrame* aFrame,
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uint32_t aConstructorFlags);
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// Construct for a frame whose parent is being restyled, but whose
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// style context is the parent style context for its parent frame.
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// (This is only used for table frames, whose style contexts are used
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// as the parent style context for their table wrapper frame. We should
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// probably try to get rid of this exception and have the inheritance go
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// the other way.)
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enum ParentContextFromChildFrame { PARENT_CONTEXT_FROM_CHILD_FRAME };
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ElementRestyler(ParentContextFromChildFrame,
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const ElementRestyler& aParentFrameRestyler,
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nsIFrame* aFrame);
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// For restyling undisplayed content only (mFrame==null).
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ElementRestyler(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsStyleChangeList* aChangeList,
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nsChangeHint aHintsHandledByAncestors,
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RestyleTracker& aRestyleTracker,
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nsTArray<nsCSSSelector*>& aSelectorsForDescendants,
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TreeMatchContext& aTreeMatchContext,
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nsTArray<nsIContent*>& aVisibleKidsOfHiddenElement,
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nsTArray<ContextToClear>& aContextsToClear,
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nsTArray<RefPtr<nsStyleContext>>& aSwappedStructOwners);
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/**
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* Restyle our frame's element and its subtree.
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*
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* Use eRestyle_Self for the aRestyleHint argument to mean
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* "reresolve our style context but not kids", use eRestyle_Subtree
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* to mean "reresolve our style context and kids", and use
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* nsRestyleHint(0) to mean recompute a new style context for our
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* current parent and existing rulenode, and the same for kids.
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*/
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void Restyle(nsRestyleHint aRestyleHint);
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/**
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* mHintsHandledBySelf changes over time; it starts off as nsChangeHint(0),
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* and by the end of Restyle it represents the hints that have been handled
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* for this frame. This method is intended to be called after Restyle, to
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* find out what hints have been handled for this frame.
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*/
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nsChangeHint HintsHandledForFrame() { return mHintsHandledBySelf; }
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/**
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* Called from GeckoRestyleManager::ComputeAndProcessStyleChange to restyle
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* children of a display:contents element.
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*/
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void RestyleChildrenOfDisplayContentsElement(nsIFrame* aParentFrame,
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nsStyleContext* aNewContext,
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nsChangeHint aMinHint,
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RestyleTracker& aRestyleTracker,
|
|
nsRestyleHint aRestyleHint,
|
|
const RestyleHintData&
|
|
aRestyleHintData);
|
|
|
|
/**
|
|
* Re-resolve the style contexts for a frame tree, building aChangeList
|
|
* based on the resulting style changes, plus aMinChange applied to aFrame.
|
|
*/
|
|
static void ComputeStyleChangeFor(nsIFrame* aFrame,
|
|
nsStyleChangeList* aChangeList,
|
|
nsChangeHint aMinChange,
|
|
RestyleTracker& aRestyleTracker,
|
|
nsRestyleHint aRestyleHint,
|
|
const RestyleHintData& aRestyleHintData,
|
|
nsTArray<ContextToClear>& aContextsToClear,
|
|
nsTArray<RefPtr<nsStyleContext>>&
|
|
aSwappedStructOwners);
|
|
|
|
#ifdef RESTYLE_LOGGING
|
|
bool ShouldLogRestyle() {
|
|
return GeckoRestyleManager::ShouldLogRestyle(mPresContext);
|
|
}
|
|
#endif
|
|
|
|
private:
|
|
inline nsStyleSet* StyleSet() const;
|
|
|
|
// Enum class 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 class RestyleResult : uint8_t {
|
|
// default initial value
|
|
eNone,
|
|
|
|
// we left the old style context on the frame; do not restyle children
|
|
eStop,
|
|
|
|
// we got a new style context on this frame, but we know that children
|
|
// do not depend on the changed values; do not restyle children
|
|
eStopWithStyleChange,
|
|
|
|
// continue restyling children
|
|
eContinue,
|
|
|
|
// continue restyling children with eRestyle_ForceDescendants set
|
|
eContinueAndForceDescendants
|
|
};
|
|
|
|
struct SwapInstruction
|
|
{
|
|
RefPtr<nsStyleContext> mOldContext;
|
|
RefPtr<nsStyleContext> mNewContext;
|
|
uint32_t mStructsToSwap;
|
|
};
|
|
|
|
/**
|
|
* First half of Restyle().
|
|
*/
|
|
RestyleResult RestyleSelf(nsIFrame* aSelf,
|
|
nsRestyleHint aRestyleHint,
|
|
uint32_t* aSwappedStructs,
|
|
nsTArray<SwapInstruction>& aSwaps);
|
|
|
|
/**
|
|
* Restyle the children of this frame (and, in turn, their children).
|
|
*
|
|
* Second half of Restyle().
|
|
*/
|
|
void RestyleChildren(nsRestyleHint aChildRestyleHint);
|
|
|
|
/**
|
|
* Returns true iff a selector in mSelectorsForDescendants matches aElement.
|
|
* This is called when processing a eRestyle_SomeDescendants restyle hint.
|
|
*/
|
|
bool SelectorMatchesForRestyle(Element* aElement);
|
|
|
|
/**
|
|
* Returns true iff aRestyleHint indicates that we should be restyling.
|
|
* Specifically, this will return true when eRestyle_Self or
|
|
* eRestyle_Subtree is present, or if eRestyle_SomeDescendants is
|
|
* present and the specified element matches one of the selectors in
|
|
* mSelectorsForDescendants.
|
|
*/
|
|
bool MustRestyleSelf(nsRestyleHint aRestyleHint, Element* aElement);
|
|
|
|
/**
|
|
* Returns true iff aRestyleHint indicates that we can call
|
|
* ReparentStyleContext rather than any other restyling method of
|
|
* nsStyleSet that looks up a new rule node, and if we are
|
|
* not in the process of reconstructing the whole rule tree.
|
|
* This is used to check whether it is appropriate to call
|
|
* ReparentStyleContext.
|
|
*/
|
|
bool CanReparentStyleContext(nsRestyleHint aRestyleHint);
|
|
|
|
/**
|
|
* Helpers for Restyle().
|
|
*/
|
|
void AddLayerChangesForAnimation();
|
|
|
|
bool MoveStyleContextsForContentChildren(nsIFrame* aParent,
|
|
nsStyleContext* aOldContext,
|
|
nsTArray<nsStyleContext*>& aContextsToMove);
|
|
bool MoveStyleContextsForChildren(nsStyleContext* aOldContext);
|
|
|
|
/**
|
|
* Helpers for RestyleSelf().
|
|
*/
|
|
void CaptureChange(nsStyleContext* aOldContext,
|
|
nsStyleContext* aNewContext,
|
|
nsChangeHint aChangeToAssume,
|
|
uint32_t* aEqualStructs,
|
|
uint32_t* aSamePointerStructs);
|
|
void ComputeRestyleResultFromFrame(nsIFrame* aSelf,
|
|
RestyleResult& aRestyleResult,
|
|
bool& aCanStopWithStyleChange);
|
|
void ComputeRestyleResultFromNewContext(nsIFrame* aSelf,
|
|
nsStyleContext* aNewContext,
|
|
RestyleResult& aRestyleResult,
|
|
bool& aCanStopWithStyleChange);
|
|
|
|
// Helpers for RestyleChildren().
|
|
void RestyleUndisplayedDescendants(nsRestyleHint aChildRestyleHint);
|
|
bool MustCheckUndisplayedContent(nsIFrame* aFrame,
|
|
nsIContent*& aUndisplayedParent);
|
|
|
|
/**
|
|
* In the following two methods, aParentStyleContext is either
|
|
* mFrame->StyleContext() if we have a frame, or a display:contents
|
|
* style context if we don't.
|
|
*/
|
|
void DoRestyleUndisplayedDescendants(nsRestyleHint aChildRestyleHint,
|
|
nsIContent* aParent,
|
|
nsStyleContext* aParentStyleContext);
|
|
void RestyleUndisplayedNodes(nsRestyleHint aChildRestyleHint,
|
|
UndisplayedNode* aUndisplayed,
|
|
nsIContent* aUndisplayedParent,
|
|
nsStyleContext* aParentStyleContext,
|
|
const StyleDisplay aDisplay);
|
|
void MaybeReframeForBeforePseudo();
|
|
void MaybeReframeForAfterPseudo(nsIFrame* aFrame);
|
|
void MaybeReframeForPseudo(CSSPseudoElementType aPseudoType,
|
|
nsIFrame* aGenConParentFrame,
|
|
nsIFrame* aFrame,
|
|
nsIContent* aContent,
|
|
nsStyleContext* aStyleContext);
|
|
#ifdef DEBUG
|
|
bool MustReframeForBeforePseudo();
|
|
bool MustReframeForAfterPseudo(nsIFrame* aFrame);
|
|
#endif
|
|
bool MustReframeForPseudo(CSSPseudoElementType aPseudoType,
|
|
nsIFrame* aGenConParentFrame,
|
|
nsIFrame* aFrame,
|
|
nsIContent* aContent,
|
|
nsStyleContext* aStyleContext);
|
|
void RestyleContentChildren(nsIFrame* aParent,
|
|
nsRestyleHint aChildRestyleHint);
|
|
void InitializeAccessibilityNotifications(nsStyleContext* aNewContext);
|
|
void SendAccessibilityNotifications();
|
|
|
|
enum DesiredA11yNotifications {
|
|
eSkipNotifications,
|
|
eSendAllNotifications,
|
|
eNotifyIfShown
|
|
};
|
|
|
|
enum A11yNotificationType {
|
|
eDontNotify,
|
|
eNotifyShown,
|
|
eNotifyHidden
|
|
};
|
|
|
|
// These methods handle the eRestyle_SomeDescendants hint by traversing
|
|
// down the frame tree (and then when reaching undisplayed content,
|
|
// the flattened content tree) find elements that match a selector
|
|
// in mSelectorsForDescendants and call AddPendingRestyle for them.
|
|
void ConditionallyRestyleChildren();
|
|
void ConditionallyRestyleChildren(nsIFrame* aFrame,
|
|
Element* aRestyleRoot);
|
|
void ConditionallyRestyleContentChildren(nsIFrame* aFrame,
|
|
Element* aRestyleRoot);
|
|
void ConditionallyRestyleUndisplayedDescendants(nsIFrame* aFrame,
|
|
Element* aRestyleRoot);
|
|
void DoConditionallyRestyleUndisplayedDescendants(nsIContent* aParent,
|
|
Element* aRestyleRoot);
|
|
void ConditionallyRestyleUndisplayedNodes(UndisplayedNode* aUndisplayed,
|
|
nsIContent* aUndisplayedParent,
|
|
const StyleDisplay aDisplay,
|
|
Element* aRestyleRoot);
|
|
void ConditionallyRestyleContentDescendants(Element* aElement,
|
|
Element* aRestyleRoot);
|
|
bool ConditionallyRestyle(nsIFrame* aFrame, Element* aRestyleRoot);
|
|
bool ConditionallyRestyle(Element* aElement, Element* aRestyleRoot);
|
|
|
|
#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;
|
|
// Hints that we computed on an ancestor (and which we already have
|
|
// generated a change list entry for). When we traverse to children
|
|
// after restyling an element, this field accumulates the hints
|
|
// generated for that element.
|
|
const nsChangeHint mHintsHandledByAncestors;
|
|
// Hints that we have computed so far the current node. This is
|
|
// initially zero, and accumulates hints for each same-style continuation
|
|
// and {ib} split sibling we restyle for the node.
|
|
nsChangeHint mHintsHandledBySelf;
|
|
RestyleTracker& mRestyleTracker;
|
|
nsTArray<nsCSSSelector*>& mSelectorsForDescendants;
|
|
TreeMatchContext& mTreeMatchContext;
|
|
nsIFrame* mResolvedChild; // child that provides our parent style context
|
|
// Array of style context subtrees in which we need to clear out cached
|
|
// structs at the end of the restyle (after change hints have been
|
|
// processed).
|
|
nsTArray<ContextToClear>& mContextsToClear;
|
|
// Style contexts that had old structs swapped into it and which should
|
|
// stay alive until the end of the restyle. (See comment in
|
|
// ElementRestyler::Restyle.)
|
|
nsTArray<RefPtr<nsStyleContext>>& mSwappedStructOwners;
|
|
// Whether this is the root of the restyle.
|
|
bool mIsRootOfRestyle;
|
|
|
|
#ifdef ACCESSIBILITY
|
|
const DesiredA11yNotifications mDesiredA11yNotifications;
|
|
DesiredA11yNotifications mKidsDesiredA11yNotifications;
|
|
A11yNotificationType mOurA11yNotification;
|
|
nsTArray<nsIContent*>& mVisibleKidsOfHiddenElement;
|
|
bool mWasFrameVisible;
|
|
#endif
|
|
|
|
#ifdef RESTYLE_LOGGING
|
|
int32_t mLoggingDepth;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* This pushes any display:contents nodes onto a TreeMatchContext.
|
|
* Use it before resolving style for kids of aParent where aParent
|
|
* (and further ancestors) may be display:contents nodes which have
|
|
* not yet been pushed onto TreeMatchContext.
|
|
*/
|
|
class MOZ_RAII AutoDisplayContentsAncestorPusher final
|
|
{
|
|
public:
|
|
typedef mozilla::dom::Element Element;
|
|
AutoDisplayContentsAncestorPusher(TreeMatchContext& aTreeMatchContext,
|
|
nsPresContext* aPresContext,
|
|
nsIContent* aParent);
|
|
~AutoDisplayContentsAncestorPusher();
|
|
bool IsEmpty() const { return mAncestors.Length() == 0; }
|
|
private:
|
|
TreeMatchContext& mTreeMatchContext;
|
|
nsPresContext* const mPresContext;
|
|
AutoTArray<mozilla::dom::Element*, 4> mAncestors;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_GeckoRestyleManager_h */
|