/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* 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 http://mozilla.org/MPL/2.0/. */ #ifndef mozilla_a11y_EventQueue_h_ #define mozilla_a11y_EventQueue_h_ #include "AccEvent.h" namespace mozilla { namespace a11y { class DocAccessible; /** * Used to organize and coalesce pending events. */ class EventQueue { protected: explicit EventQueue(DocAccessible* aDocument) : mDocument(aDocument) { } /** * Put an accessible event into the queue to process it later. */ bool PushEvent(AccEvent* aEvent); /** * Puts a name change event into the queue, if needed. */ bool PushNameChange(Accessible* aTarget); /** * Process events from the queue and fires events. */ void ProcessEventQueue(); private: EventQueue(const EventQueue&) = delete; EventQueue& operator = (const EventQueue&) = delete; // Event queue processing /** * Coalesce redundant events from the queue. */ void CoalesceEvents(); /** * Coalesce events from the same subtree. */ void CoalesceReorderEvents(AccEvent* aTailEvent); /** * Coalesce two selection change events within the same select control. */ void CoalesceSelChangeEvents(AccSelChangeEvent* aTailEvent, AccSelChangeEvent* aThisEvent, uint32_t aThisIndex); protected: /** * The document accessible reference owning this queue. */ DocAccessible* mDocument; /** * Pending events array. Don't make this an AutoTArray; we use * SwapElements() on it. */ nsTArray<RefPtr<AccEvent>> mEvents; }; } // namespace a11y } // namespace mozilla #endif // mozilla_a11y_EventQueue_h_