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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 "SelectionController.h"
22 
23 #include "AccessibilityObjectWrapperAtk.h"
24 #include "AXObjectCache.h"
25 #include "Frame.h"
26 #include "RefPtr.h"
27 
28 #include <gtk/gtk.h>
29 
30 namespace WebCore {
31 
emitTextSelectionChange(AccessibilityObject * object,VisibleSelection selection,int offset)32 static void emitTextSelectionChange(AccessibilityObject* object, VisibleSelection selection, int offset)
33 {
34     AtkObject* axObject = object->wrapper();
35     if (!axObject || !ATK_IS_TEXT(axObject))
36         return;
37 
38     g_signal_emit_by_name(axObject, "text-caret-moved", offset);
39     if (selection.isRange())
40         g_signal_emit_by_name(axObject, "text-selection-changed");
41 }
42 
maybeEmitTextFocusChange(PassRefPtr<AccessibilityObject> prpObject)43 static void maybeEmitTextFocusChange(PassRefPtr<AccessibilityObject> prpObject)
44 {
45     // This static variable is needed to keep track of the old object
46     // as per previous calls to this function, in order to properly
47     // decide whether to emit some signals or not.
48     DEFINE_STATIC_LOCAL(RefPtr<AccessibilityObject>, oldObject, ());
49 
50     RefPtr<AccessibilityObject> object = prpObject;
51 
52     // Ensure the oldObject belongs to the same document that the
53     // current object so further comparisons make sense. Otherwise,
54     // just reset oldObject to 0 so it won't be taken into account in
55     // the immediately following call to this function.
56     if (object && oldObject && oldObject->document() != object->document())
57         oldObject = 0;
58 
59     AtkObject* axObject = object ? object->wrapper() : 0;
60     AtkObject* oldAxObject = oldObject ? oldObject->wrapper() : 0;
61 
62     if (axObject != oldAxObject) {
63         if (oldAxObject && ATK_IS_TEXT(oldAxObject)) {
64             g_signal_emit_by_name(oldAxObject, "focus-event", false);
65             g_signal_emit_by_name(oldAxObject, "state-change", "focused", false);
66         }
67         if (axObject && ATK_IS_TEXT(axObject)) {
68             g_signal_emit_by_name(axObject, "focus-event", true);
69             g_signal_emit_by_name(axObject, "state-change", "focused", true);
70         }
71     }
72 
73     // Update pointer to last focused object.
74     oldObject = object;
75 }
76 
77 
notifyAccessibilityForSelectionChange()78 void SelectionController::notifyAccessibilityForSelectionChange()
79 {
80     if (!AXObjectCache::accessibilityEnabled())
81         return;
82 
83     // Reset lastFocuseNode and return for no valid selections.
84     if (!m_selection.start().isNotNull() || !m_selection.end().isNotNull())
85         return;
86 
87     RenderObject* focusedNode = m_selection.end().deprecatedNode()->renderer();
88     AccessibilityObject* accessibilityObject = m_frame->document()->axObjectCache()->getOrCreate(focusedNode);
89 
90     // Need to check this as getOrCreate could return 0,
91     if (!accessibilityObject)
92         return;
93 
94     int offset;
95     // Always report the events w.r.t. the non-linked unignored parent. (i.e. ignoreLinks == true).
96     RefPtr<AccessibilityObject> object = objectAndOffsetUnignored(accessibilityObject, offset, true);
97     if (!object)
98         return;
99 
100     // Emit relatedsignals.
101     emitTextSelectionChange(object.get(), m_selection, offset);
102     maybeEmitTextFocusChange(object.release());
103 }
104 
105 } // namespace WebCore
106