Home | History | Annotate | Download | only in gtk 
      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 
     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 
     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 
     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