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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /accessible/base/EventQueue.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | accessible/base/EventQueue.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/accessible/base/EventQueue.h b/accessible/base/EventQueue.h new file mode 100644 index 0000000000..434acd3c09 --- /dev/null +++ b/accessible/base/EventQueue.h @@ -0,0 +1,79 @@ +/* -*- 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 name and/or description change events into the queue, if needed. + */ + bool PushNameOrDescriptionChange(AccEvent* aOrigEvent); + + /** + * 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; + + // Pending focus event. + RefPtr<AccEvent> mFocusEvent; +}; + +} // namespace a11y +} // namespace mozilla + +#endif // mozilla_a11y_EventQueue_h_ |