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90 lines
2.3 KiB
C++
90 lines
2.3 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_ActiveElementManager_h
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#define mozilla_layers_ActiveElementManager_h
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#include "nsCOMPtr.h"
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#include "nsISupportsImpl.h"
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class inIDOMUtils;
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class CancelableTask;
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namespace mozilla {
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namespace dom {
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class Element;
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class EventTarget;
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}
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namespace layers {
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/**
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* Manages setting and clearing the ':active' CSS pseudostate in the presence
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* of touch input.
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*/
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class ActiveElementManager {
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~ActiveElementManager();
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public:
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NS_INLINE_DECL_REFCOUNTING(ActiveElementManager)
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ActiveElementManager();
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/**
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* Specify the target of a touch. Typically this should be called right
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* before HandleTouchStart(), but we give callers the flexibility to specify
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* the target later if they don't know it at the time they call
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* HandleTouchStart().
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* |aTarget| may be nullptr.
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*/
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void SetTargetElement(dom::EventTarget* aTarget);
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/**
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* Handle a touch-start event.
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* @param aCanBePan whether the touch can be a pan
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*/
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void HandleTouchStart(bool aCanBePan);
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/**
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* Handle the start of panning.
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*/
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void HandlePanStart();
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/**
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* Handle a touch-end or touch-cancel event.
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* @param aWasClick whether the touch was a click
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*/
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void HandleTouchEnd(bool aWasClick);
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private:
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nsCOMPtr<inIDOMUtils> mDomUtils;
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/**
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* The target of the first touch point in the current touch block.
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*/
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nsCOMPtr<dom::Element> mTarget;
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/**
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* Whether the current touch block can be a pan. Set in HandleTouchStart().
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*/
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bool mCanBePan;
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/**
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* Whether mCanBePan has been set for the current touch block.
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* We need to keep track of this to allow HandleTouchStart() and
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* SetTargetElement() to be called in either order.
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*/
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bool mCanBePanSet;
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/**
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* A task for calling SetActive() after a timeout.
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*/
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CancelableTask* mSetActiveTask;
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// Helpers
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void TriggerElementActivation();
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void SetActive(dom::Element* aTarget);
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void ResetActive();
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void ResetTouchBlockState();
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void SetActiveTask(dom::Element* aTarget);
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void CancelTask();
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};
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}
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}
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#endif /* mozilla_layers_ActiveElementManager_h */
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