23662f6e46
In particular, this fixes: * Restyling of <area> elements that reuse the primary frame mapping for the image map. * Restyling of children of display: contents elements when the display: contents element generates a hint. * Restyling of out-of-flows (if my analysis in the bug is right). * Restyling of the ::backdrop pseudo-element. * Restyling of the Viewport frame. I only managed to do a reftest for the second one, but the rest of them are covered by the assertions added. MozReview-Commit-ID: E7QtiQ1vPqu
259 lines
9.1 KiB
C++
259 lines
9.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ServoRestyleManager_h
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#define mozilla_ServoRestyleManager_h
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#include "mozilla/EventStates.h"
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#include "mozilla/RestyleManager.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/ServoElementSnapshot.h"
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#include "mozilla/ServoElementSnapshotTable.h"
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#include "nsChangeHint.h"
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#include "nsPresContext.h"
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namespace mozilla {
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namespace dom {
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class Element;
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} // namespace dom
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} // namespace mozilla
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class nsAttrValue;
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class nsIAtom;
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class nsIContent;
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class nsIFrame;
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class nsStyleChangeList;
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namespace mozilla {
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/**
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* A stack class used to pass some common restyle state in a slightly more
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* comfortable way than a bunch of individual arguments, and that also checks
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* that the change hint used for optimization is correctly used in debug mode.
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*/
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class ServoRestyleState
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{
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public:
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ServoRestyleState(ServoStyleSet& aStyleSet, nsStyleChangeList& aChangeList)
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: mStyleSet(aStyleSet)
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, mChangeList(aChangeList)
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, mChangesHandled(nsChangeHint(0))
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{}
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// We shouldn't assume that changes handled from our parent are handled for
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// our children too if we're out of flow since they aren't necessarily
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// parented in DOM order, and thus a change handled by a DOM ancestor doesn't
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// necessarily mean that it's handled for an ancestor frame.
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enum class Type
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{
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InFlow,
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OutOfFlow,
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};
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ServoRestyleState(const nsIFrame& aOwner,
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ServoRestyleState& aParentState,
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nsChangeHint aHintForThisFrame,
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Type aType)
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: mStyleSet(aParentState.mStyleSet)
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, mChangeList(aParentState.mChangeList)
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, mChangesHandled(
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aType == Type::InFlow
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? aParentState.mChangesHandled | aHintForThisFrame
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: aHintForThisFrame)
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#ifdef DEBUG
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, mOwner(&aOwner)
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#endif
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{
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if (aType == Type::InFlow) {
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AssertOwner(aParentState);
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}
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}
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nsStyleChangeList& ChangeList() { return mChangeList; }
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ServoStyleSet& StyleSet() { return mStyleSet; }
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#ifdef DEBUG
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void AssertOwner(const ServoRestyleState& aParentState) const;
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nsChangeHint ChangesHandledFor(const nsIFrame&) const;
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#else
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void AssertOwner(const ServoRestyleState&) const {}
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nsChangeHint ChangesHandledFor(const nsIFrame&) const
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{
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return mChangesHandled;
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}
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#endif
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private:
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ServoStyleSet& mStyleSet;
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nsStyleChangeList& mChangeList;
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const nsChangeHint mChangesHandled;
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// We track the "owner" frame of this restyle state, that is, the frame that
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// generated the last change that is stored in mChangesHandled, in order to
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// verify that we only use mChangesHandled for actual descendants of that
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// frame (given DOM order isn't always frame order, and that there are a few
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// special cases for stuff like wrapper frames, ::backdrop, and so on).
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#ifdef DEBUG
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const nsIFrame* mOwner { nullptr };
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#endif
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};
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/**
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* Restyle manager for a Servo-backed style system.
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*/
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class ServoRestyleManager : public RestyleManager
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{
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friend class ServoStyleSet;
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public:
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typedef ServoElementSnapshotTable SnapshotTable;
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typedef RestyleManager base_type;
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explicit ServoRestyleManager(nsPresContext* aPresContext);
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void PostRestyleEvent(dom::Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aMinChangeHint);
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void PostRestyleEventForCSSRuleChanges();
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void RebuildAllStyleData(nsChangeHint aExtraHint,
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nsRestyleHint aRestyleHint);
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void PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint,
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nsRestyleHint aRestyleHint);
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void ProcessPendingRestyles();
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void UpdateOnlyAnimationStyles();
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void ContentInserted(nsINode* aContainer, nsIContent* aChild);
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void ContentAppended(nsIContent* aContainer,
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nsIContent* aFirstNewContent);
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void ContentRemoved(nsINode* aContainer,
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nsIContent* aOldChild,
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nsIContent* aFollowingSibling);
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void RestyleForInsertOrChange(nsINode* aContainer,
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nsIContent* aChild);
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void RestyleForAppend(nsIContent* aContainer,
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nsIContent* aFirstNewContent);
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void ContentStateChanged(nsIContent* aContent, EventStates aStateMask);
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void AttributeWillChange(dom::Element* aElement,
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int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType,
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const nsAttrValue* aNewValue);
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void AttributeChanged(dom::Element* aElement, int32_t aNameSpaceID,
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nsIAtom* aAttribute, int32_t aModType,
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const nsAttrValue* aOldValue);
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nsresult ReparentStyleContext(nsIFrame* aFrame);
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/**
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* Gets the appropriate frame given a content and a pseudo-element tag.
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*
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* Right now only supports a null tag, before or after. If the pseudo-element
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* is not null, the content needs to be an element.
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*/
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static nsIFrame* FrameForPseudoElement(const Element* aElement,
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nsIAtom* aPseudoTagOrNull);
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/**
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* Clears the ServoElementData and HasDirtyDescendants from all elements
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* in the subtree rooted at aElement.
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*/
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static void ClearServoDataFromSubtree(Element* aElement);
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/**
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* Clears HasDirtyDescendants and RestyleData from all elements in the
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* subtree rooted at aElement.
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*/
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static void ClearRestyleStateFromSubtree(Element* aElement);
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/**
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* Posts restyle hints for animations.
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* This is only called for the second traversal for CSS animations during
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* updating CSS animations in a SequentialTask.
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* This function does neither register a refresh observer nor flag that a
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* style flush is needed since this function is supposed to be called during
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* restyling process and this restyle event will be processed in the second
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* traversal of the same restyling process.
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*/
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static void PostRestyleEventForAnimations(dom::Element* aElement,
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CSSPseudoElementType aPseudoType,
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nsRestyleHint aRestyleHint);
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protected:
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~ServoRestyleManager() override
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{
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MOZ_ASSERT(!mReentrantChanges);
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}
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private:
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/**
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* Performs post-Servo-traversal processing on this element and its
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* descendants.
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*
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* Returns whether any style did actually change. There may be cases where we
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* didn't need to change any style after all, for example, when a content
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* attribute changes that happens not to have any effect on the style of that
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* element or any descendant or sibling.
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*/
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bool ProcessPostTraversal(Element* aElement,
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nsStyleContext* aParentContext,
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ServoRestyleState& aRestyleState);
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struct TextPostTraversalState;
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bool ProcessPostTraversalForText(nsIContent* aTextNode,
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TextPostTraversalState& aState);
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inline ServoStyleSet* StyleSet() const
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{
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MOZ_ASSERT(PresContext()->StyleSet()->IsServo(),
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"ServoRestyleManager should only be used with a Servo-flavored "
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"style backend");
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return PresContext()->StyleSet()->AsServo();
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}
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const SnapshotTable& Snapshots() const { return mSnapshots; }
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void ClearSnapshots();
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ServoElementSnapshot& SnapshotFor(mozilla::dom::Element* aElement);
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void DoProcessPendingRestyles(TraversalRestyleBehavior aRestyleBehavior);
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// We use a separate data structure from nsStyleChangeList because we need a
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// frame to create nsStyleChangeList entries, and the primary frame may not be
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// attached yet.
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struct ReentrantChange {
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nsCOMPtr<nsIContent> mContent;
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nsChangeHint mHint;
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};
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typedef AutoTArray<ReentrantChange, 10> ReentrantChangeList;
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// Only non-null while processing change hints. See the comment in
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// ProcessPendingRestyles.
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ReentrantChangeList* mReentrantChanges;
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// We use this flag to track if the current restyle contains any non-animation
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// update, which triggers a normal restyle, and so there might be any new
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// transition created later. Therefore, if this flag is true, we need to
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// increase mAnimationGeneration before creating new transitions, so their
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// creation sequence will be correct.
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bool mHaveNonAnimationRestyles = false;
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// Set to true when posting restyle events triggered by CSS rule changes.
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// This flag is cleared once ProcessPendingRestyles has completed.
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// When we process a traversal all descendants elements of the document
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// triggered by CSS rule changes, we will need to update all elements with
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// CSS animations. We propagate TraversalRestyleBehavior::ForCSSRuleChanges
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// to traversal function if this flag is set.
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bool mRestyleForCSSRuleChanges = false;
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// A hashtable with the elements that have changed state or attributes, in
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// order to calculate restyle hints during the traversal.
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SnapshotTable mSnapshots;
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};
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} // namespace mozilla
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#endif // mozilla_ServoRestyleManager_h
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