зеркало из https://github.com/mozilla/gecko-dev.git
98 строки
2.6 KiB
C++
98 строки
2.6 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_RestyleManagerBase_h
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#define mozilla_RestyleManagerBase_h
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#include "nsChangeHint.h"
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namespace mozilla {
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class ServoRestyleManager;
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class RestyleManager;
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/**
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* Class for sharing data and logic common to both RestyleManager and
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* ServoRestyleManager.
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*/
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class RestyleManagerBase
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{
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protected:
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explicit RestyleManagerBase(nsPresContext* aPresContext);
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public:
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typedef mozilla::dom::Element Element;
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// Get an integer that increments every time we process pending restyles.
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// The value is never 0.
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uint32_t GetRestyleGeneration() const { return mRestyleGeneration; }
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// Get an integer that increments every time there is a style change
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// as a result of a change to the :hover content state.
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uint32_t GetHoverGeneration() const { return mHoverGeneration; }
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bool ObservingRefreshDriver() const { return mObservingRefreshDriver; }
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void SetObservingRefreshDriver(bool aObserving) {
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mObservingRefreshDriver = aObserving;
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}
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void Disconnect() { mPresContext = nullptr; }
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protected:
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void ContentStateChangedInternal(Element* aElement,
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EventStates aStateMask,
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nsChangeHint* aOutChangeHint,
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nsRestyleHint* aOutRestyleHint);
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bool IsDisconnected() { return mPresContext == nullptr; }
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void IncrementHoverGeneration() {
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++mHoverGeneration;
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}
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void IncrementRestyleGeneration() {
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if (++mRestyleGeneration == 0) {
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// Keep mRestyleGeneration from being 0, since that's what
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// nsPresContext::GetRestyleGeneration returns when it no
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// longer has a RestyleManager.
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++mRestyleGeneration;
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}
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}
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nsPresContext* PresContext() const {
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MOZ_ASSERT(mPresContext);
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return mPresContext;
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}
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nsCSSFrameConstructor* FrameConstructor() const {
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return PresContext()->FrameConstructor();
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}
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inline bool IsGecko() const {
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return !IsServo();
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}
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inline bool IsServo() const {
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#ifdef MOZ_STYLO
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return PresContext()->StyleSet()->IsServo();
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#else
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return false;
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#endif
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}
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private:
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nsPresContext* mPresContext; // weak, can be null after Disconnect().
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uint32_t mRestyleGeneration;
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uint32_t mHoverGeneration;
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// True if we're already waiting for a refresh notification.
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bool mObservingRefreshDriver;
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};
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} // namespace mozilla
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#endif
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