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9c67e88e45
The set of events fired to platform accessibility is not the same as the set in the event queue. Therefore we should forward events to the parent process someplace where they are the same so the same events can be emitted for child processes.
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<nsRefPtr<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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