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