44 lines
1.4 KiB
C++
44 lines
1.4 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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#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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class nsIDocument;
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namespace mozilla {
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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
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{
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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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explicit ScrollLinkedEffectDetector(nsIDocument* aDoc);
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~ScrollLinkedEffectDetector();
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private:
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RefPtr<nsIDocument> mDocument;
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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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