1/*
2 * Copyright (C) 2009 Igalia S.L.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#include "config.h"
21#include "FrameSelection.h"
22
23#if HAVE(ACCESSIBILITY)
24
25#include "AXObjectCache.h"
26#include "Document.h"
27#include "Frame.h"
28#include "RenderListItem.h"
29#include "WebKitAccessible.h"
30#include "WebKitAccessibleUtil.h"
31#include <glib.h>
32#include <wtf/NeverDestroyed.h>
33#include <wtf/RefPtr.h>
34
35namespace WebCore {
36
37static void emitTextSelectionChange(AccessibilityObject* object, VisibleSelection selection, int offset)
38{
39 auto* axObject = object->wrapper();
40 if (!axObject || !ATK_IS_TEXT(axObject))
41 return;
42
43 // We need to adjust the offset for the list item marker in Left-To-Right text because
44 // the list item marker is exposed through the text of the accessible list item rather
45 // than through a separate accessible object.
46 RenderObject* renderer = object->renderer();
47 if (is<RenderListItem>(renderer) && renderer->style().direction() == TextDirection::LTR)
48 offset += downcast<RenderListItem>(*renderer).markerTextWithSuffix().length();
49
50 g_signal_emit_by_name(axObject, "text-caret-moved", offset);
51 if (selection.isRange())
52 g_signal_emit_by_name(axObject, "text-selection-changed");
53}
54
55static void maybeEmitTextFocusChange(RefPtr<AccessibilityObject>&& object)
56{
57 // This static variable is needed to keep track of the old object
58 // as per previous calls to this function, in order to properly
59 // decide whether to emit some signals or not.
60 static NeverDestroyed<RefPtr<AccessibilityObject>> oldObject;
61
62 // Ensure the oldObject belongs to the same document that the
63 // current object so further comparisons make sense. Otherwise,
64 // just reset oldObject to 0 so it won't be taken into account in
65 // the immediately following call to this function.
66 if (object && oldObject.get() && oldObject.get()->document() != object->document())
67 oldObject.get() = nullptr;
68
69 auto* axObject = object ? object->wrapper() : nullptr;
70 auto* oldAxObject = oldObject.get() ? oldObject.get()->wrapper() : nullptr;
71
72 if (axObject != oldAxObject) {
73 if (oldAxObject && ATK_IS_TEXT(oldAxObject)) {
74 g_signal_emit_by_name(oldAxObject, "focus-event", FALSE);
75 atk_object_notify_state_change(ATK_OBJECT(oldAxObject), ATK_STATE_FOCUSED, FALSE);
76 }
77 if (axObject && ATK_IS_TEXT(axObject)) {
78 g_signal_emit_by_name(axObject, "focus-event", TRUE);
79 atk_object_notify_state_change(ATK_OBJECT(axObject), ATK_STATE_FOCUSED, TRUE);
80 }
81 }
82
83 // Update pointer to last focused object.
84 oldObject.get() = WTFMove(object);
85}
86
87
88void FrameSelection::notifyAccessibilityForSelectionChange(const AXTextStateChangeIntent&)
89{
90 if (!AXObjectCache::accessibilityEnabled())
91 return;
92
93 if (!m_selection.start().isNotNull() || !m_selection.end().isNotNull())
94 return;
95
96 Node* focusedNode = m_selection.end().containerNode();
97 if (!focusedNode)
98 return;
99
100 AXObjectCache* cache = m_frame->document()->existingAXObjectCache();
101 if (!cache)
102 return;
103
104 AccessibilityObject* accessibilityObject = cache->getOrCreate(focusedNode->renderer());
105 if (!accessibilityObject)
106 return;
107
108 int offset;
109 RefPtr<AccessibilityObject> object = objectFocusedAndCaretOffsetUnignored(accessibilityObject, offset);
110 if (!object)
111 return;
112
113 emitTextSelectionChange(object.get(), m_selection, offset);
114 maybeEmitTextFocusChange(WTFMove(object));
115}
116
117} // namespace WebCore
118
119#endif // HAVE(ACCESSIBILITY)
120