1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/layers/apz/util/ActiveElementManager.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,85 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef mozilla_layers_ActiveElementManager_h
1.10 +#define mozilla_layers_ActiveElementManager_h
1.11 +
1.12 +#include "nsCOMPtr.h"
1.13 +#include "nsISupportsImpl.h"
1.14 +
1.15 +class inIDOMUtils;
1.16 +class nsIDOMEventTarget;
1.17 +class nsIDOMElement;
1.18 +class CancelableTask;
1.19 +
1.20 +namespace mozilla {
1.21 +namespace layers {
1.22 +
1.23 +/**
1.24 + * Manages setting and clearing the ':active' CSS pseudostate in the presence
1.25 + * of touch input.
1.26 + */
1.27 +class ActiveElementManager {
1.28 +public:
1.29 + NS_INLINE_DECL_REFCOUNTING(ActiveElementManager)
1.30 +
1.31 + ActiveElementManager();
1.32 + ~ActiveElementManager();
1.33 +
1.34 + /**
1.35 + * Specify the target of a touch. Typically this should be called right
1.36 + * before HandleTouchStart(), but we give callers the flexibility to specify
1.37 + * the target later if they don't know it at the time they call
1.38 + * HandleTouchStart().
1.39 + * |aTarget| may be nullptr.
1.40 + */
1.41 + void SetTargetElement(nsIDOMEventTarget* aTarget);
1.42 + /**
1.43 + * Handle a touch-start event.
1.44 + * @param aCanBePan whether the touch can be a pan
1.45 + */
1.46 + void HandleTouchStart(bool aCanBePan);
1.47 + /**
1.48 + * Handle the start of panning.
1.49 + */
1.50 + void HandlePanStart();
1.51 + /**
1.52 + * Handle a touch-end or touch-cancel event.
1.53 + * @param aWasClick whether the touch was a click
1.54 + */
1.55 + void HandleTouchEnd(bool aWasClick);
1.56 +private:
1.57 + nsCOMPtr<inIDOMUtils> mDomUtils;
1.58 + /**
1.59 + * The target of the first touch point in the current touch block.
1.60 + */
1.61 + nsCOMPtr<nsIDOMElement> mTarget;
1.62 + /**
1.63 + * Whether the current touch block can be a pan. Set in HandleTouchStart().
1.64 + */
1.65 + bool mCanBePan;
1.66 + /**
1.67 + * Whether mCanBePan has been set for the current touch block.
1.68 + * We need to keep track of this to allow HandleTouchStart() and
1.69 + * SetTargetElement() to be called in either order.
1.70 + */
1.71 + bool mCanBePanSet;
1.72 + /**
1.73 + * A task for calling SetActive() after a timeout.
1.74 + */
1.75 + CancelableTask* mSetActiveTask;
1.76 +
1.77 + // Helpers
1.78 + void TriggerElementActivation();
1.79 + void SetActive(nsIDOMElement* aTarget);
1.80 + void ResetActive();
1.81 + void SetActiveTask(nsIDOMElement* aTarget);
1.82 + void CancelTask();
1.83 +};
1.84 +
1.85 +}
1.86 +}
1.87 +
1.88 +#endif /* mozilla_layers_ActiveElementManager_h */
