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comparison: accessible/src/base/EventQueue.h
accessible/src/base/EventQueue.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_a11y_EventQueue_h_ | |
| 7 #define mozilla_a11y_EventQueue_h_ | |
| 8 | |
| 9 #include "AccEvent.h" | |
| 10 | |
| 11 namespace mozilla { | |
| 12 namespace a11y { | |
| 13 | |
| 14 class DocAccessible; | |
| 15 | |
| 16 /** | |
| 17 * Used to organize and coalesce pending events. | |
| 18 */ | |
| 19 class EventQueue | |
| 20 { | |
| 21 protected: | |
| 22 EventQueue(DocAccessible* aDocument) : mDocument(aDocument) { } | |
| 23 | |
| 24 /** | |
| 25 * Put an accessible event into the queue to process it later. | |
| 26 */ | |
| 27 bool PushEvent(AccEvent* aEvent); | |
| 28 | |
| 29 /** | |
| 30 * Process events from the queue and fires events. | |
| 31 */ | |
| 32 void ProcessEventQueue(); | |
| 33 | |
| 34 private: | |
| 35 EventQueue(const EventQueue&) MOZ_DELETE; | |
| 36 EventQueue& operator = (const EventQueue&) MOZ_DELETE; | |
| 37 | |
| 38 // Event queue processing | |
| 39 /** | |
| 40 * Coalesce redundant events from the queue. | |
| 41 */ | |
| 42 void CoalesceEvents(); | |
| 43 | |
| 44 /** | |
| 45 * Coalesce events from the same subtree. | |
| 46 */ | |
| 47 void CoalesceReorderEvents(AccEvent* aTailEvent); | |
| 48 | |
| 49 /** | |
| 50 * Coalesce two selection change events within the same select control. | |
| 51 */ | |
| 52 void CoalesceSelChangeEvents(AccSelChangeEvent* aTailEvent, | |
| 53 AccSelChangeEvent* aThisEvent, | |
| 54 uint32_t aThisIndex); | |
| 55 | |
| 56 /** | |
| 57 * Coalesce text change events caused by sibling hide events. | |
| 58 */ | |
| 59 void CoalesceTextChangeEventsFor(AccHideEvent* aTailEvent, | |
| 60 AccHideEvent* aThisEvent); | |
| 61 void CoalesceTextChangeEventsFor(AccShowEvent* aTailEvent, | |
| 62 AccShowEvent* aThisEvent); | |
| 63 | |
| 64 /** | |
| 65 * Create text change event caused by hide or show event. When a node is | |
| 66 * hidden/removed or shown/appended, the text in an ancestor hyper text will | |
| 67 * lose or get new characters. | |
| 68 */ | |
| 69 void CreateTextChangeEventFor(AccMutationEvent* aEvent); | |
| 70 | |
| 71 protected: | |
| 72 | |
| 73 /** | |
| 74 * The document accessible reference owning this queue. | |
| 75 */ | |
| 76 DocAccessible* mDocument; | |
| 77 | |
| 78 /** | |
| 79 * Pending events array. Don't make this an nsAutoTArray; we use | |
| 80 * SwapElements() on it. | |
| 81 */ | |
| 82 nsTArray<nsRefPtr<AccEvent> > mEvents; | |
| 83 }; | |
| 84 | |
| 85 } // namespace a11y | |
| 86 } // namespace mozilla | |
| 87 | |
| 88 #endif // mozilla_a11y_EventQueue_h_ |
