mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-28 03:18:41 +00:00
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 -*- */
|
|
/* 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);
|
|
|
|
/**
|
|
* Process events from the queue and fires events.
|
|
*/
|
|
void ProcessEventQueue();
|
|
|
|
private:
|
|
EventQueue(const EventQueue&) MOZ_DELETE;
|
|
EventQueue& operator = (const EventQueue&) MOZ_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);
|
|
|
|
/**
|
|
* Coalesce text change events caused by sibling hide events.
|
|
*/
|
|
void CoalesceTextChangeEventsFor(AccHideEvent* aTailEvent,
|
|
AccHideEvent* aThisEvent);
|
|
void CoalesceTextChangeEventsFor(AccShowEvent* aTailEvent,
|
|
AccShowEvent* aThisEvent);
|
|
|
|
/**
|
|
* Create text change event caused by hide or show event. When a node is
|
|
* hidden/removed or shown/appended, the text in an ancestor hyper text will
|
|
* lose or get new characters.
|
|
*/
|
|
void CreateTextChangeEventFor(AccMutationEvent* aEvent);
|
|
|
|
protected:
|
|
|
|
/**
|
|
* The document accessible reference owning this queue.
|
|
*/
|
|
DocAccessible* mDocument;
|
|
|
|
/**
|
|
* Pending events array. Don't make this an nsAutoTArray; we use
|
|
* SwapElements() on it.
|
|
*/
|
|
nsTArray<nsRefPtr<AccEvent> > mEvents;
|
|
};
|
|
|
|
} // namespace a11y
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_a11y_EventQueue_h_
|