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comparison: gfx/layers/apz/util/ActiveElementManager.h
gfx/layers/apz/util/ActiveElementManager.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef mozilla_layers_ActiveElementManager_h | |
| 7 #define mozilla_layers_ActiveElementManager_h | |
| 8 | |
| 9 #include "nsCOMPtr.h" | |
| 10 #include "nsISupportsImpl.h" | |
| 11 | |
| 12 class inIDOMUtils; | |
| 13 class nsIDOMEventTarget; | |
| 14 class nsIDOMElement; | |
| 15 class CancelableTask; | |
| 16 | |
| 17 namespace mozilla { | |
| 18 namespace layers { | |
| 19 | |
| 20 /** | |
| 21 * Manages setting and clearing the ':active' CSS pseudostate in the presence | |
| 22 * of touch input. | |
| 23 */ | |
| 24 class ActiveElementManager { | |
| 25 public: | |
| 26 NS_INLINE_DECL_REFCOUNTING(ActiveElementManager) | |
| 27 | |
| 28 ActiveElementManager(); | |
| 29 ~ActiveElementManager(); | |
| 30 | |
| 31 /** | |
| 32 * Specify the target of a touch. Typically this should be called right | |
| 33 * before HandleTouchStart(), but we give callers the flexibility to specify | |
| 34 * the target later if they don't know it at the time they call | |
| 35 * HandleTouchStart(). | |
| 36 * |aTarget| may be nullptr. | |
| 37 */ | |
| 38 void SetTargetElement(nsIDOMEventTarget* aTarget); | |
| 39 /** | |
| 40 * Handle a touch-start event. | |
| 41 * @param aCanBePan whether the touch can be a pan | |
| 42 */ | |
| 43 void HandleTouchStart(bool aCanBePan); | |
| 44 /** | |
| 45 * Handle the start of panning. | |
| 46 */ | |
| 47 void HandlePanStart(); | |
| 48 /** | |
| 49 * Handle a touch-end or touch-cancel event. | |
| 50 * @param aWasClick whether the touch was a click | |
| 51 */ | |
| 52 void HandleTouchEnd(bool aWasClick); | |
| 53 private: | |
| 54 nsCOMPtr<inIDOMUtils> mDomUtils; | |
| 55 /** | |
| 56 * The target of the first touch point in the current touch block. | |
| 57 */ | |
| 58 nsCOMPtr<nsIDOMElement> mTarget; | |
| 59 /** | |
| 60 * Whether the current touch block can be a pan. Set in HandleTouchStart(). | |
| 61 */ | |
| 62 bool mCanBePan; | |
| 63 /** | |
| 64 * Whether mCanBePan has been set for the current touch block. | |
| 65 * We need to keep track of this to allow HandleTouchStart() and | |
| 66 * SetTargetElement() to be called in either order. | |
| 67 */ | |
| 68 bool mCanBePanSet; | |
| 69 /** | |
| 70 * A task for calling SetActive() after a timeout. | |
| 71 */ | |
| 72 CancelableTask* mSetActiveTask; | |
| 73 | |
| 74 // Helpers | |
| 75 void TriggerElementActivation(); | |
| 76 void SetActive(nsIDOMElement* aTarget); | |
| 77 void ResetActive(); | |
| 78 void SetActiveTask(nsIDOMElement* aTarget); | |
| 79 void CancelTask(); | |
| 80 }; | |
| 81 | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 #endif /* mozilla_layers_ActiveElementManager_h */ |
