1/* 2 * Copyright (C) 2011 Igalia S.L. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "config.h" 30#include "AccessibilityCallbacks.h" 31 32#include "AccessibilityController.h" 33#include "DumpRenderTree.h" 34#include "GOwnPtr.h" 35#include "WebCoreSupport/DumpRenderTreeSupportGtk.h" 36#include <gtk/gtk.h> 37#include <webkit/webkit.h> 38 39static guint stateChangeListenerId = 0; 40static guint focusEventListenerId = 0; 41static guint activeDescendantChangedListenerId = 0; 42static guint childrenChangedListenerId = 0; 43static guint propertyChangedListenerId = 0; 44static guint visibleDataChangedListenerId = 0; 45 46static guint loadCompleteListenerId = 0; 47static guint loadStoppedListenerId = 0; 48static guint reloadListenerId = 0; 49 50static void printAccessibilityEvent(AtkObject* accessible, const gchar* signalName) 51{ 52 // Sanity check. 53 if (!accessible || !ATK_IS_OBJECT(accessible) || !signalName) 54 return; 55 56 const gchar* objectName = atk_object_get_name(accessible); 57 guint objectRole = atk_object_get_role(accessible); 58 59 // Try to always provide a name to be logged for the object. 60 if (!objectName || *objectName == '\0') 61 objectName = "(No name)"; 62 63 printf("Accessibility object emitted \"%s\" / Name: \"%s\" / Role: %d\n", 64 signalName, objectName, objectRole); 65} 66 67static gboolean axObjectEventListener(GSignalInvocationHint *signalHint, 68 guint numParamValues, 69 const GValue *paramValues, 70 gpointer data) 71{ 72 // At least we should receive the instance emitting the signal. 73 if (numParamValues < 1) 74 return TRUE; 75 76 AtkObject* accessible = ATK_OBJECT(g_value_get_object(¶mValues[0])); 77 if (!accessible || !ATK_IS_OBJECT(accessible)) 78 return TRUE; 79 80 GSignalQuery signal_query; 81 GOwnPtr<gchar> signalName; 82 83 g_signal_query(signalHint->signal_id, &signal_query); 84 85 if (!g_strcmp0(signal_query.signal_name, "state-change")) { 86 signalName.set(g_strdup_printf("state-change:%s = %d", 87 g_value_get_string(¶mValues[1]), 88 g_value_get_boolean(¶mValues[2]))); 89 } else if (!g_strcmp0(signal_query.signal_name, "focus-event")) { 90 signalName.set(g_strdup_printf("focus-event = %d", 91 g_value_get_boolean(¶mValues[1]))); 92 } else if (!g_strcmp0(signal_query.signal_name, "children-changed")) { 93 signalName.set(g_strdup_printf("children-changed = %d", 94 g_value_get_uint(¶mValues[1]))); 95 } else if (!g_strcmp0(signal_query.signal_name, "property-change")) { 96 signalName.set(g_strdup_printf("property-change:%s", 97 g_quark_to_string(signalHint->detail))); 98 } else 99 signalName.set(g_strdup(signal_query.signal_name)); 100 101 printAccessibilityEvent(accessible, signalName.get()); 102 103 return TRUE; 104} 105 106static gboolean axDocumentEventListener(GSignalInvocationHint *signalHint, 107 guint numParamValues, 108 const GValue *paramValues, 109 gpointer data) 110{ 111 // At least we should receive the instance emitting the signal. 112 if (numParamValues < 1) 113 return TRUE; 114 115 AtkObject* accessible = ATK_OBJECT(g_value_get_object(¶mValues[0])); 116 if (!accessible || !ATK_IS_DOCUMENT(accessible)) 117 return TRUE; 118 119 GSignalQuery signal_query; 120 g_signal_query(signalHint->signal_id, &signal_query); 121 122 printAccessibilityEvent(accessible, signal_query.signal_name); 123 124 return TRUE; 125} 126 127void connectAccessibilityCallbacks() 128{ 129 // Ensure no callbacks are connected before. 130 disconnectAccessibilityCallbacks(); 131 132 // Ensure that accessibility is initialized for the WebView by querying for 133 // the root accessible object, which will create the full hierarchy. 134 DumpRenderTreeSupportGtk::getRootAccessibleElement(mainFrame); 135 136 // Add global listeners for AtkObject's signals. 137 stateChangeListenerId = atk_add_global_event_listener(axObjectEventListener, "Gtk:AtkObject:state-change"); 138 focusEventListenerId = atk_add_global_event_listener(axObjectEventListener, "Gtk:AtkObject:focus-event"); 139 activeDescendantChangedListenerId = atk_add_global_event_listener(axObjectEventListener, "Gtk:AtkObject:active-descendant-changed"); 140 childrenChangedListenerId = atk_add_global_event_listener(axObjectEventListener, "Gtk:AtkObject:children-changed"); 141 propertyChangedListenerId = atk_add_global_event_listener(axObjectEventListener, "Gtk:AtkObject:property-change"); 142 visibleDataChangedListenerId = atk_add_global_event_listener(axObjectEventListener, "Gtk:AtkObject:visible-data-changed"); 143 144 // Ensure the Atk interface types are registered, otherwise 145 // the AtkDocument signal handlers below won't get registered. 146 GObject* dummyAxObject = G_OBJECT(g_object_new(ATK_TYPE_OBJECT, 0)); 147 AtkObject* dummyNoOpAxObject = atk_no_op_object_new(dummyAxObject); 148 g_object_unref(G_OBJECT(dummyNoOpAxObject)); 149 g_object_unref(dummyAxObject); 150 151 // Add global listeners for AtkDocument's signals. 152 loadCompleteListenerId = atk_add_global_event_listener(axDocumentEventListener, "Gtk:AtkDocument:load-complete"); 153 loadStoppedListenerId = atk_add_global_event_listener(axDocumentEventListener, "Gtk:AtkDocument:load-stopped"); 154 reloadListenerId = atk_add_global_event_listener(axDocumentEventListener, "Gtk:AtkDocument:reload"); 155} 156 157void disconnectAccessibilityCallbacks() 158{ 159 // AtkObject signals. 160 if (stateChangeListenerId) { 161 atk_remove_global_event_listener(stateChangeListenerId); 162 stateChangeListenerId = 0; 163 } 164 if (focusEventListenerId) { 165 atk_remove_global_event_listener(focusEventListenerId); 166 focusEventListenerId = 0; 167 } 168 if (activeDescendantChangedListenerId) { 169 atk_remove_global_event_listener(activeDescendantChangedListenerId); 170 activeDescendantChangedListenerId = 0; 171 } 172 if (childrenChangedListenerId) { 173 atk_remove_global_event_listener(childrenChangedListenerId); 174 childrenChangedListenerId = 0; 175 } 176 if (propertyChangedListenerId) { 177 atk_remove_global_event_listener(propertyChangedListenerId); 178 propertyChangedListenerId = 0; 179 } 180 if (visibleDataChangedListenerId) { 181 atk_remove_global_event_listener(visibleDataChangedListenerId); 182 visibleDataChangedListenerId = 0; 183 } 184 185 // AtkDocument signals. 186 if (loadCompleteListenerId) { 187 atk_remove_global_event_listener(loadCompleteListenerId); 188 loadCompleteListenerId = 0; 189 } 190 if (loadStoppedListenerId) { 191 atk_remove_global_event_listener(loadStoppedListenerId); 192 loadStoppedListenerId = 0; 193 } 194 if (reloadListenerId) { 195 atk_remove_global_event_listener(reloadListenerId); 196 reloadListenerId = 0; 197 } 198} 199 200