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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/Platform.h>
#if PLATFORM(COCOA)
#include "AXCoreObject.h"
#include "AttributedString.h"
#include <wtf/HashMap.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class AccessibilityObject;
class AXObjectCache;
enum class LiveRegionStatus : uint8_t;
enum class LiveRegionRelevant : uint8_t {
Additions = 1 << 0,
Removals = 1 << 1,
Text = 1 << 2,
All = 1 << 3
};
struct LiveRegionObject {
AXID objectID;
String text;
String language;
HashSet<AXID> descendants; // For atomic regions only, to track additions/removals of descendants.
};
struct LiveRegionSnapshot {
Vector<LiveRegionObject> objects;
LiveRegionStatus liveRegionStatus { LiveRegionStatus::Off };
OptionSet<LiveRegionRelevant> liveRegionRelevant { { LiveRegionRelevant::Additions, LiveRegionRelevant::Text } };
};
enum class AnnouncementContents : bool { All, Changes };
class AXLiveRegionManager {
WTF_MAKE_NONCOPYABLE(AXLiveRegionManager);
WTF_MAKE_TZONE_ALLOCATED(AXLiveRegionManager);
public:
explicit AXLiveRegionManager(AXObjectCache&);
~AXLiveRegionManager() = default;
void registerLiveRegion(AccessibilityObject&, bool = false);
void unregisterLiveRegion(AXID axID) { m_liveRegions.remove(axID); }
void handleLiveRegionChange(AccessibilityObject&, AnnouncementContents = AnnouncementContents::Changes);
private:
struct LiveRegionDiff {
Vector<LiveRegionObject> added;
Vector<LiveRegionObject> removed;
Vector<LiveRegionObject> changed;
};
LiveRegionSnapshot buildLiveRegionSnapshot(AccessibilityObject&) const;
bool shouldIncludeInSnapshot(AccessibilityObject&) const;
String textForObject(AccessibilityObject&) const;
void postAnnouncementForChange(AccessibilityObject&, const LiveRegionSnapshot&, const LiveRegionSnapshot&);
LiveRegionDiff computeChanges(const Vector<LiveRegionObject>&, const Vector<LiveRegionObject>&) const;
AttributedString computeAnnouncement(const LiveRegionSnapshot&, const LiveRegionDiff&) const;
CheckedRef<AXObjectCache> m_cache;
HashMap<AXID, LiveRegionSnapshot> m_liveRegions;
};
} // namespace WebCore
#endif // PLATFORM(COCOA)
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