зеркало из https://github.com/mozilla/gecko-dev.git
70 строки
2.4 KiB
C++
70 строки
2.4 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_InputAPZContext_h
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#define mozilla_layers_InputAPZContext_h
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#include "mozilla/EventForwards.h"
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#include "mozilla/layers/ScrollableLayerGuid.h"
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namespace mozilla {
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namespace layers {
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// InputAPZContext is used to communicate various pieces of information
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// around the codebase without having to plumb it through lots of functions
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// and codepaths. Conceptually it is attached to a WidgetInputEvent that is
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// relevant to APZ.
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//
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// There are two types of information bits propagated using this class. One
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// type is propagated "downwards" (from a process entry point like nsBaseWidget
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// or BrowserChild) into deeper code that is run during complicated operations
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// like event dispatch. The other type is information that is propagated
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// "upwards", from the deeper code back to the entry point.
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class MOZ_STACK_CLASS InputAPZContext {
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private:
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// State that is propagated downwards from InputAPZContext creation into
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// "deeper" code.
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static ScrollableLayerGuid sGuid;
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static uint64_t sBlockId;
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static nsEventStatus sApzResponse;
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static bool sPendingLayerization;
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// State that is set in deeper code and propagated upwards.
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static bool sRoutedToChildProcess;
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public:
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// Functions to access downwards-propagated data
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static ScrollableLayerGuid GetTargetLayerGuid();
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static uint64_t GetInputBlockId();
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static nsEventStatus GetApzResponse();
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static bool HavePendingLayerization();
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// Functions to access upwards-propagated data
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static bool WasRoutedToChildProcess();
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// Constructor sets the data to be propagated downwards
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InputAPZContext(const ScrollableLayerGuid& aGuid, const uint64_t& aBlockId,
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const nsEventStatus& aApzResponse,
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bool aPendingLayerization = false);
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~InputAPZContext();
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// Functions to set data to be propagated upwards
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static void SetRoutedToChildProcess();
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private:
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ScrollableLayerGuid mOldGuid;
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uint64_t mOldBlockId;
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nsEventStatus mOldApzResponse;
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bool mOldPendingLayerization;
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bool mOldRoutedToChildProcess;
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};
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} // namespace layers
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} // namespace mozilla
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#endif /* mozilla_layers_InputAPZContext_h */
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