89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_a11y_EventQueue_h_
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#define mozilla_a11y_EventQueue_h_
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#include "AccEvent.h"
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namespace mozilla {
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namespace a11y {
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class DocAccessible;
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/**
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* Used to organize and coalesce pending events.
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*/
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class EventQueue
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{
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protected:
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explicit EventQueue(DocAccessible* aDocument) : mDocument(aDocument) { }
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/**
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* Put an accessible event into the queue to process it later.
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*/
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bool PushEvent(AccEvent* aEvent);
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/**
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* Process events from the queue and fires events.
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*/
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void ProcessEventQueue();
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private:
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EventQueue(const EventQueue&) = delete;
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EventQueue& operator = (const EventQueue&) = delete;
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// Event queue processing
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/**
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* Coalesce redundant events from the queue.
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*/
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void CoalesceEvents();
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/**
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* Coalesce events from the same subtree.
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*/
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void CoalesceReorderEvents(AccEvent* aTailEvent);
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/**
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* Coalesce two selection change events within the same select control.
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*/
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void CoalesceSelChangeEvents(AccSelChangeEvent* aTailEvent,
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AccSelChangeEvent* aThisEvent,
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uint32_t aThisIndex);
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/**
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* Coalesce text change events caused by sibling hide events.
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*/
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void CoalesceTextChangeEventsFor(AccHideEvent* aTailEvent,
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AccHideEvent* aThisEvent);
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void CoalesceTextChangeEventsFor(AccShowEvent* aTailEvent,
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AccShowEvent* aThisEvent);
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/**
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* Create text change event caused by hide or show event. When a node is
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* hidden/removed or shown/appended, the text in an ancestor hyper text will
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* lose or get new characters.
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*/
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void CreateTextChangeEventFor(AccMutationEvent* aEvent);
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protected:
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/**
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* The document accessible reference owning this queue.
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*/
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DocAccessible* mDocument;
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/**
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* Pending events array. Don't make this an nsAutoTArray; we use
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* SwapElements() on it.
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*/
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nsTArray<RefPtr<AccEvent> > mEvents;
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};
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} // namespace a11y
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} // namespace mozilla
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#endif // mozilla_a11y_EventQueue_h_
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