105 lines
3.0 KiB
C++
105 lines
3.0 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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namespace mozilla {
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class CancelableRunnable;
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namespace dom {
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class Element;
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class EventTarget;
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} // namespace dom
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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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* after HandleTouchStart(), but in cases where the APZ needs to wait for
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* a content response the HandleTouchStart() may be delayed, in which case
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* this function can be called first.
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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 state notification from APZ. This notification
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* may be delayed until after touch listeners have responded to the APZ.
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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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* Clear the active element.
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*/
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void ClearActivation();
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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 HandleTouchEndEvent(bool aWasClick);
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/**
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* Handle a touch-end state notification from APZ. This notification may be
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* delayed until after touch listeners have responded to the APZ.
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*/
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void HandleTouchEnd();
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/**
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* @return true iff the currently active element (or one of its ancestors)
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* actually had a style for the :active pseudo-class. The currently active
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* element is the root element if no other elements are active.
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*/
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bool ActiveElementUsesStyle() const;
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private:
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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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RefPtr<CancelableRunnable> mSetActiveTask;
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/**
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* See ActiveElementUsesStyle() documentation.
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*/
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bool mActiveElementUsesStyle;
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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(const nsCOMPtr<dom::Element>& aTarget);
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void CancelTask();
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};
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} // namespace layers
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} // namespace mozilla
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#endif /* mozilla_layers_ActiveElementManager_h */
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