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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef mozilla_layers_ActiveElementManager_h
#define mozilla_layers_ActiveElementManager_h
#include "nsCOMPtr.h"
#include "nsISupportsImpl.h"
namespace mozilla {
class CancelableRunnable;
namespace dom {
class Element;
class EventTarget;
} // namespace dom
namespace layers {
class DelayedClearElementActivation;
* Manages setting and clearing the ':active' CSS pseudostate in the presence
* of touch input.
class ActiveElementManager final {
* Specify the target of a touch. Typically this should be called right
* after HandleTouchStart(), but in cases where the APZ needs to wait for
* a content response the HandleTouchStart() may be delayed, in which case
* this function can be called first.
* |aTarget| may be nullptr.
void SetTargetElement(dom::EventTarget* aTarget);
* Handle a touch-start state notification from APZ. This notification
* may be delayed until after touch listeners have responded to the APZ.
* @param aCanBePan whether the touch can be a pan
void HandleTouchStart(bool aCanBePan);
* Clear the active element.
void ClearActivation();
* Handle a touch-end or touch-cancel event.
* @param aWasClick whether the touch was a click
void HandleTouchEndEvent(bool aWasClick);
* Handle a touch-end state notification from APZ. This notification may be
* delayed until after touch listeners have responded to the APZ.
void HandleTouchEnd();
* Possibly clear active element sate in response to a single tap.
void ProcessSingleTap();
* Cleanup on window destroy.
void Destroy();
* The target of the first touch point in the current touch block.
nsCOMPtr<dom::Element> mTarget;
* Whether the current touch block can be a pan. Set in HandleTouchStart().
bool mCanBePan;
* Whether mCanBePan has been set for the current touch block.
* We need to keep track of this to allow HandleTouchStart() and
* SetTargetElement() to be called in either order.
bool mCanBePanSet;
* A task for calling SetActive() after a timeout.
RefPtr<CancelableRunnable> mSetActiveTask;
// Store the pending single tap event element activation clearing
// task.
RefPtr<DelayedClearElementActivation> mDelayedClearElementActivation;
// Helpers
void TriggerElementActivation();
void SetActive(dom::Element* aTarget);
void ResetActive();
void ResetTouchBlockState();
void SetActiveTask(const nsCOMPtr<dom::Element>& aTarget);
void CancelTask();
} // namespace layers
} // namespace mozilla
#endif /* mozilla_layers_ActiveElementManager_h */