gfx/layers/apz/util/ActiveElementManager.h@b8a032363ba2 (annotated)
gfx/layers/apz/util/ActiveElementManager.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #ifndef mozilla_layers_ActiveElementManager_h |
| michael@0 | 7 | #define mozilla_layers_ActiveElementManager_h |
| michael@0 | 8 | |
| michael@0 | 9 | #include "nsCOMPtr.h" |
| michael@0 | 10 | #include "nsISupportsImpl.h" |
| michael@0 | 11 | |
| michael@0 | 12 | class inIDOMUtils; |
| michael@0 | 13 | class nsIDOMEventTarget; |
| michael@0 | 14 | class nsIDOMElement; |
| michael@0 | 15 | class CancelableTask; |
| michael@0 | 16 | |
| michael@0 | 17 | namespace mozilla { |
| michael@0 | 18 | namespace layers { |
| michael@0 | 19 | |
| michael@0 | 20 | /** |
| michael@0 | 21 | * Manages setting and clearing the ':active' CSS pseudostate in the presence |
| michael@0 | 22 | * of touch input. |
| michael@0 | 23 | */ |
| michael@0 | 24 | class ActiveElementManager { |
| michael@0 | 25 | public: |
| michael@0 | 26 | NS_INLINE_DECL_REFCOUNTING(ActiveElementManager) |
| michael@0 | 27 | |
| michael@0 | 28 | ActiveElementManager(); |
| michael@0 | 29 | ~ActiveElementManager(); |
| michael@0 | 30 | |
| michael@0 | 31 | /** |
| michael@0 | 32 | * Specify the target of a touch. Typically this should be called right |
| michael@0 | 33 | * before HandleTouchStart(), but we give callers the flexibility to specify |
| michael@0 | 34 | * the target later if they don't know it at the time they call |
| michael@0 | 35 | * HandleTouchStart(). |
| michael@0 | 36 | * |aTarget| may be nullptr. |
| michael@0 | 37 | */ |
| michael@0 | 38 | void SetTargetElement(nsIDOMEventTarget* aTarget); |
| michael@0 | 39 | /** |
| michael@0 | 40 | * Handle a touch-start event. |
| michael@0 | 41 | * @param aCanBePan whether the touch can be a pan |
| michael@0 | 42 | */ |
| michael@0 | 43 | void HandleTouchStart(bool aCanBePan); |
| michael@0 | 44 | /** |
| michael@0 | 45 | * Handle the start of panning. |
| michael@0 | 46 | */ |
| michael@0 | 47 | void HandlePanStart(); |
| michael@0 | 48 | /** |
| michael@0 | 49 | * Handle a touch-end or touch-cancel event. |
| michael@0 | 50 | * @param aWasClick whether the touch was a click |
| michael@0 | 51 | */ |
| michael@0 | 52 | void HandleTouchEnd(bool aWasClick); |
| michael@0 | 53 | private: |
| michael@0 | 54 | nsCOMPtr<inIDOMUtils> mDomUtils; |
| michael@0 | 55 | /** |
| michael@0 | 56 | * The target of the first touch point in the current touch block. |
| michael@0 | 57 | */ |
| michael@0 | 58 | nsCOMPtr<nsIDOMElement> mTarget; |
| michael@0 | 59 | /** |
| michael@0 | 60 | * Whether the current touch block can be a pan. Set in HandleTouchStart(). |
| michael@0 | 61 | */ |
| michael@0 | 62 | bool mCanBePan; |
| michael@0 | 63 | /** |
| michael@0 | 64 | * Whether mCanBePan has been set for the current touch block. |
| michael@0 | 65 | * We need to keep track of this to allow HandleTouchStart() and |
| michael@0 | 66 | * SetTargetElement() to be called in either order. |
| michael@0 | 67 | */ |
| michael@0 | 68 | bool mCanBePanSet; |
| michael@0 | 69 | /** |
| michael@0 | 70 | * A task for calling SetActive() after a timeout. |
| michael@0 | 71 | */ |
| michael@0 | 72 | CancelableTask* mSetActiveTask; |
| michael@0 | 73 | |
| michael@0 | 74 | // Helpers |
| michael@0 | 75 | void TriggerElementActivation(); |
| michael@0 | 76 | void SetActive(nsIDOMElement* aTarget); |
| michael@0 | 77 | void ResetActive(); |
| michael@0 | 78 | void SetActiveTask(nsIDOMElement* aTarget); |
| michael@0 | 79 | void CancelTask(); |
| michael@0 | 80 | }; |
| michael@0 | 81 | |
| michael@0 | 82 | } |
| michael@0 | 83 | } |
| michael@0 | 84 | |
| michael@0 | 85 | #endif /* mozilla_layers_ActiveElementManager_h */ |
