зеркало из https://github.com/mozilla/gecko-dev.git
49 строки
1.6 KiB
C++
49 строки
1.6 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_layers_ScrollLinkedEffectDetector_h
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#define mozilla_layers_ScrollLinkedEffectDetector_h
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#include "mozilla/RefPtr.h"
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#include "mozilla/TimeStamp.h"
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namespace mozilla {
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namespace dom {
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class Document;
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}
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namespace layers {
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// ScrollLinkedEffectDetector is used to detect the existence of a scroll-linked
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// effect on a webpage. Generally speaking, a scroll-linked effect is something
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// on the page that animates or changes with respect to the scroll position.
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// Content authors usually rely on running some JS in response to the scroll
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// event in order to implement such effects, and therefore it tends to be laggy
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// or work improperly with APZ enabled. This class helps us detect such an
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// effect so that we can warn the author and/or take other preventative
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// measures.
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class MOZ_STACK_CLASS ScrollLinkedEffectDetector final {
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private:
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static uint32_t sDepth;
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static bool sFoundScrollLinkedEffect;
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public:
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static void PositioningPropertyMutated();
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ScrollLinkedEffectDetector(dom::Document*, const TimeStamp& aTimeStamp);
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~ScrollLinkedEffectDetector();
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private:
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RefPtr<dom::Document> mDocument;
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TimeStamp mTimeStamp;
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};
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} // namespace layers
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} // namespace mozilla
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#endif /* mozilla_layers_ScrollLinkedEffectDetector_h */
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