blob: 2935473a281ba09a6b472449ec2ae711f1ced966 [file] [log] [blame]
/*
* Copyright (C) 2009 Igalia S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "FrameSelection.h"
#if ENABLE(ACCESSIBILITY)
#include "AXObjectCache.h"
#include "Document.h"
#include "Frame.h"
#include "RenderListItem.h"
#include "WebKitAccessible.h"
#include "WebKitAccessibleUtil.h"
#include <glib.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/RefPtr.h>
namespace WebCore {
static void emitTextSelectionChange(AccessibilityObject* object, VisibleSelection selection, int offset)
{
auto* axObject = object->wrapper();
if (!axObject || !ATK_IS_TEXT(axObject))
return;
// We need to adjust the offset for the list item marker in Left-To-Right text because
// the list item marker is exposed through the text of the accessible list item rather
// than through a separate accessible object.
RenderObject* renderer = object->renderer();
if (is<RenderListItem>(renderer) && renderer->style().direction() == TextDirection::LTR)
offset += downcast<RenderListItem>(*renderer).markerTextWithSuffix().length();
g_signal_emit_by_name(axObject, "text-caret-moved", offset);
if (selection.isRange())
g_signal_emit_by_name(axObject, "text-selection-changed");
}
static void maybeEmitTextFocusChange(RefPtr<AccessibilityObject>&& object)
{
// This static variable is needed to keep track of the old object
// as per previous calls to this function, in order to properly
// decide whether to emit some signals or not.
static NeverDestroyed<RefPtr<AccessibilityObject>> oldObject;
// Ensure the oldObject belongs to the same document that the
// current object so further comparisons make sense. Otherwise,
// just reset oldObject to 0 so it won't be taken into account in
// the immediately following call to this function.
if (object && oldObject.get() && oldObject.get()->document() != object->document())
oldObject.get() = nullptr;
auto* axObject = object ? object->wrapper() : nullptr;
auto* oldAxObject = oldObject.get() ? oldObject.get()->wrapper() : nullptr;
if (axObject != oldAxObject) {
if (oldAxObject && ATK_IS_TEXT(oldAxObject)) {
g_signal_emit_by_name(oldAxObject, "focus-event", FALSE);
atk_object_notify_state_change(ATK_OBJECT(oldAxObject), ATK_STATE_FOCUSED, FALSE);
}
if (axObject && ATK_IS_TEXT(axObject)) {
g_signal_emit_by_name(axObject, "focus-event", TRUE);
atk_object_notify_state_change(ATK_OBJECT(axObject), ATK_STATE_FOCUSED, TRUE);
}
}
// Update pointer to last focused object.
oldObject.get() = WTFMove(object);
}
void FrameSelection::notifyAccessibilityForSelectionChange(const AXTextStateChangeIntent&)
{
if (!AXObjectCache::accessibilityEnabled())
return;
if (!m_selection.start().isNotNull() || !m_selection.end().isNotNull())
return;
Node* focusedNode = m_selection.end().containerNode();
if (!focusedNode)
return;
AXObjectCache* cache = m_frame->document()->existingAXObjectCache();
if (!cache)
return;
AccessibilityObject* accessibilityObject = cache->getOrCreate(focusedNode->renderer());
if (!accessibilityObject)
return;
int offset;
RefPtr<AccessibilityObject> object = objectFocusedAndCaretOffsetUnignored(accessibilityObject, offset);
if (!object)
return;
emitTextSelectionChange(object.get(), m_selection, offset);
maybeEmitTextFocusChange(WTFMove(object));
}
} // namespace WebCore
#endif // ENABLE(ACCESSIBILITY)