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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.accessibility.AccessibleFactory;
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12
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13
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14 import dwt.internal.accessibility.gtk.ATK;
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15 import dwt.internal.gtk.OS;
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16 import dwt.accessibility.Accessible;
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17 import dwt.accessibility.ACC;
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18 import dwt.accessibility.AccessibleObject;
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19 import dwt.accessibility.AccessibleControlEvent;
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20 import dwt.accessibility.AccessibleControlListener;
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21
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22 import dwt.SWT;
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23
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24 import tango.stdc.stringz;
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25 import tango.io.Stdout;
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26
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27 class AccessibleFactory {
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28 AtkObjectFactory * handle;
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29 uint objectParentType;
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30 char* widgetTypeName;
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31
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32 //Callback atkObjectFactoryCB_create_accessible;
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33 //Callback gTypeInfo_base_init_factory;
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34 Accessible[GtkWidget*] accessibles;
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35
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36 static long[char[]] Types;
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37 static AccessibleFactory[long] Factories;
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38
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39 static const uint DefaultParentType; //$NON-NLS-1$
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40 static const char[] FACTORY_PARENTTYPENAME = "AtkObjectFactory";
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41 static const char[] SWT_TYPE_PREFIX = "SWT";
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42 static const char[] CHILD_TYPENAME = "Child";
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43 static const char[] FACTORY_TYPENAME = "SWTFactory";
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44 static const int[] actionRoles = [
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45 ACC.ROLE_CHECKBUTTON, ACC.ROLE_COMBOBOX, ACC.ROLE_LINK,
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46 ACC.ROLE_MENUITEM, ACC.ROLE_PUSHBUTTON, ACC.ROLE_RADIOBUTTON,
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47 ];
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48 static const int[] hypertextRoles = [ACC.ROLE_LINK];
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49 static const int[] selectionRoles = [
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50 ACC.ROLE_LIST, ACC.ROLE_TABFOLDER, ACC.ROLE_TABLE, ACC.ROLE_TREE,
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51 ];
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52 static const int[] textRoles = [
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53 ACC.ROLE_COMBOBOX, ACC.ROLE_LINK, ACC.ROLE_LABEL, ACC.ROLE_TEXT,
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54 ];
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55
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56 /* AT callbacks*/
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57 /* interface definitions */
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58 static GTypeInfo* ObjectIfaceDefinition;
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59 static const GInterfaceInfo* ActionIfaceDefinition;
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60 static const GInterfaceInfo* ComponentIfaceDefinition;
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61 static const GInterfaceInfo* HypertextIfaceDefinition;
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62 static const GInterfaceInfo* SelectionIfaceDefinition;
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63 static const GInterfaceInfo* TextIfaceDefinition;
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64
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65 static this(){
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66 DefaultParentType = OS.g_type_from_name ("GtkAccessible"); //$NON-NLS-1$
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67 /* Action interface */
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68 ActionIfaceDefinition = cast(GInterfaceInfo*)OS.g_malloc (GInterfaceInfo.sizeof);
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69 ActionIfaceDefinition.interface_init = &AccessibleFactory.initActionIfaceCB;
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70 /* Component interface */
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71 ComponentIfaceDefinition = cast(GInterfaceInfo*)OS.g_malloc (GInterfaceInfo.sizeof);
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72 ComponentIfaceDefinition.interface_init = &AccessibleFactory.initComponentIfaceCB;
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73 /* Hypertext interface */
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74 HypertextIfaceDefinition = cast(GInterfaceInfo*)OS.g_malloc (GInterfaceInfo.sizeof);
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75 HypertextIfaceDefinition.interface_init = &AccessibleFactory.initHypertextIfaceCB;
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76 /* Selection interface */
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77 SelectionIfaceDefinition = cast(GInterfaceInfo*)OS.g_malloc (GInterfaceInfo.sizeof);
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78 SelectionIfaceDefinition.interface_init = &AccessibleFactory.initSelectionIfaceCB;
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79 /* Text interface */
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80 TextIfaceDefinition =cast(GInterfaceInfo*) OS.g_malloc (GInterfaceInfo.sizeof);
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81 TextIfaceDefinition.interface_init = &AccessibleFactory.initTextIfaceCB;
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82 }
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83
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84 private this (int /*long*/ widgetType) {
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85 widgetTypeName = OS.g_type_name (widgetType);
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86 char[] factoryName = FACTORY_TYPENAME ~ fromUtf8z( widgetTypeName ) ~ \0;
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87 if (OS.g_type_from_name (factoryName.ptr) is 0) {
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88 /* register the factory */
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89 auto registry = ATK.atk_get_default_registry ();
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90 auto previousFactory = ATK.atk_registry_get_factory (registry, widgetType);
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91 objectParentType = ATK.atk_object_factory_get_accessible_type (previousFactory);
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92 if (objectParentType is 0) objectParentType = DefaultParentType;
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93 auto factoryParentType = OS.g_type_from_name (FACTORY_PARENTTYPENAME.ptr);
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94 auto typeInfo = cast(GTypeInfo*) OS.g_malloc (GTypeInfo.sizeof);
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95 typeInfo.base_init = &gTypeInfo_base_init_factory;
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96 typeInfo.class_size = AtkObjectFactoryClass.sizeof;
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97 typeInfo.instance_size = AtkObjectFactory.sizeof;
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98 auto swtFactoryType = OS.g_type_register_static (factoryParentType, factoryName.ptr, typeInfo, 0);
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99 ATK.atk_registry_set_factory_type (registry, widgetType, swtFactoryType);
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100 handle = ATK.atk_registry_get_factory (registry, widgetType);
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101 }
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102 }
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103
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104 void addAccessible (Accessible accessible) {
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105 auto controlHandle = accessible.getControlHandle ();
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106 accessibles[controlHandle] = accessible;
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107 ATK.atk_object_factory_create_accessible (handle, cast(GObject*)controlHandle);
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108 }
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109
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110 private static extern(C) AtkObject* atkObjectFactory_create_accessible (GObject* widget) {
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111 auto widgetType = OS.G_OBJECT_TYPE ( cast(GTypeInstance*)widget);
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112 if( auto factory = widgetType in Factories ){
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113 with( *factory ){
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114 Accessible accessible = accessibles[ cast(GtkWidget*) widget ];
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115 if (accessible is null) {
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116 /*
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117 * we don't care about this control, so create it with the parent's
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118 * type so that its accessibility callbacks will not pass though here
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119 */
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120 auto result = cast(AtkObject*) OS.g_object_new (objectParentType, null);
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121 ATK.atk_object_initialize (result, cast(void*)widget);
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122 return result;
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123 }
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124 /* if an atk object has already been created for this widget then just return it */
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125 if (accessible.accessibleObject !is null) {
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126 return accessible.accessibleObject.handle;
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127 }
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128 char[] buffer = fromUtf8z( widgetTypeName ).dup;
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129 auto type = getType (buffer, accessible, objectParentType, ACC.CHILDID_SELF);
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130 AccessibleObject object = new AccessibleObject (type, cast(GtkWidget*)widget, accessible, objectParentType, false);
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131 accessible.accessibleObject = object;
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132 return object.handle;
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133 }
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134 }
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135 else{
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136 Stdout.formatln( "AccessibleFactory.atkObjectFactoryCB_create_accessible cannot find factory instance" );
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137 }
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138 }
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139
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140 static int /*long*/ getChildType (Accessible accessible, int childIndex) {
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141 return getType (CHILD_TYPENAME, accessible, DefaultParentType, childIndex);
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142 }
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143
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144 static int /*long*/ getDefaultParentType () {
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145 return DefaultParentType;
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146 }
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147
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148 static int /*long*/ getType (char[] widgetTypeName, Accessible accessible, int /*long*/ parentType, int childId) {
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149 AccessibleControlEvent event = new AccessibleControlEvent (accessible);
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150 event.childID = childId;
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151 AccessibleControlListener[] listeners = accessible.getControlListeners ();
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152 for (int i = 0; i < listeners.length; i++) {
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153 listeners [i].getRole (event);
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154 }
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155 bool action = false, hypertext = false, selection = false, text = false;
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156 if (event.detail !is 0) { /* a role was specified */
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157 for (int i = 0; i < actionRoles.length; i++) {
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158 if (event.detail is actionRoles [i]) {
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159 action = true;
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160 break;
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161 }
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162 }
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163 for (int i = 0; i < hypertextRoles.length; i++) {
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164 if (event.detail is hypertextRoles [i]) {
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165 hypertext = true;
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166 break;
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167 }
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168 }
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169 for (int i = 0; i < selectionRoles.length; i++) {
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170 if (event.detail is selectionRoles [i]) {
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171 selection = true;
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172 break;
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173 }
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174 }
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175 for (int i = 0; i < textRoles.length; i++) {
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176 if (event.detail is textRoles [i]) {
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177 text = true;
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178 break;
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179 }
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180 }
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181 } else {
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182 action = hypertext = selection = text = true;
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183 }
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184 char[] swtTypeName = SWT_TYPE_PREFIX.dup;
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185 swtTypeName ~= widgetTypeName;
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186 if (action) swtTypeName ~= "Action"; //$NON-NLS-1$
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187 if (hypertext) swtTypeName ~= "Hypertext"; //$NON-NLS-1$
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188 if (selection) swtTypeName ~= "Selection"; //$NON-NLS-1$
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189 if (text) swtTypeName ~= "Text"; //$NON-NLS-1$
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190
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191 int /*long*/ type = 0;
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192 if (swtTypeName in Types ) {
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193 type = Types[swtTypeName];
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194 } else {
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195 /* define the type */
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196 GTypeQuery* query = new GTypeQuery ();
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197 OS.g_type_query (parentType, query);
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198
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199 GTypeInfo* typeInfo = new GTypeInfo ();
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200 typeInfo.base_init = &gTypeInfo_base_init_type;
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201 typeInfo.class_size = query.class_size;
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202 typeInfo.instance_size = query.instance_size;
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203 ObjectIfaceDefinition = typeInfo;
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204
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205 type = OS.g_type_register_static (parentType, toStringz( swtTypeName ), ObjectIfaceDefinition, 0);
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206 OS.g_type_add_interface_static (type, AccessibleObject.ATK_COMPONENT_TYPE, ComponentIfaceDefinition);
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207 if (action) OS.g_type_add_interface_static (type, AccessibleObject.ATK_ACTION_TYPE, ActionIfaceDefinition);
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208 if (hypertext) OS.g_type_add_interface_static (type, AccessibleObject.ATK_HYPERTEXT_TYPE, HypertextIfaceDefinition);
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209 if (selection) OS.g_type_add_interface_static (type, AccessibleObject.ATK_SELECTION_TYPE, SelectionIfaceDefinition);
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210 if (text) OS.g_type_add_interface_static (type, AccessibleObject.ATK_TEXT_TYPE, TextIfaceDefinition);
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211 Types[swtTypeName] = type;
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212 }
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213 return type;
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214 }
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215
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216 private static extern(C) void gTypeInfo_base_init_factory (void* klass) {
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217 auto atkObjectFactoryClass = ATK.ATK_OBJECT_FACTORY_CLASS (klass);
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218 atkObjectFactoryClass.create_accessible = &atkObjectFactory_create_accessible;
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219 }
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220
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221 private static extern(C) void gTypeInfo_base_init_type (void* klass) {
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222 auto objectClass = cast(AtkObjectClass*)klass;
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223 objectClass.get_name = &AccessibleObject.atkObject_get_name;
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224 objectClass.get_description = &AccessibleObject.atkObject_get_description;
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225 objectClass.get_n_children = &AccessibleObject.atkObject_get_n_children;
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226 objectClass.get_role = &AccessibleObject.atkObject_get_role;
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227 objectClass.get_parent = &AccessibleObject.atkObject_get_parent;
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228 objectClass.ref_state_set = &AccessibleObject.atkObject_ref_state_set;
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229 objectClass.get_index_in_parent = &AccessibleObject.atkObject_get_index_in_parent;
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230 objectClass.ref_child = &AccessibleObject.atkObject_ref_child;
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231
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232 GObjectClass* gObjectClass = OS.G_OBJECT_CLASS ( cast(GTypeClass*)klass);
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233 gObjectClass.finalize = &AccessibleObject.gObjectClass_finalize;
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234 }
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235
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236 private static extern(C) void initActionIfaceCB ( void* g_iface, void* iface_data ) {
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237 auto iface = cast(AtkActionIface*)g_iface;
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238 iface.get_keybinding = &AccessibleObject.atkAction_get_keybinding;
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239 iface.get_name = &AccessibleObject.atkAction_get_name;
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240 }
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241
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242 private static extern(C) void initComponentIfaceCB ( void* g_iface, void* iface_data ) {
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243 auto iface = cast(AtkComponentIface*)g_iface;
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244 iface.get_extents = &AccessibleObject.atkComponent_get_extents;
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245 iface.get_position = &AccessibleObject.atkComponent_get_position;
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246 iface.get_size = &AccessibleObject.atkComponent_get_size;
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247 iface.ref_accessible_at_point = &AccessibleObject.atkComponent_ref_accessible_at_point;
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248 }
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249
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250 private static extern(C) void initHypertextIfaceCB ( void* g_iface, void* iface_data ) {
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251 auto iface = cast(AtkHypertextIface*)g_iface;
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252 iface.get_link = &AccessibleObject.atkHypertext_get_link;
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253 iface.get_link_index = &AccessibleObject.atkHypertext_get_link_index;
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254 iface.get_n_links = &AccessibleObject.atkHypertext_get_n_links;
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255 }
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256
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257 private static extern(C) void initSelectionIfaceCB ( void* g_iface, void* iface_data ) {
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258 auto iface = cast(AtkSelectionIface*)g_iface;
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259 iface.is_child_selected = &AccessibleObject.atkSelection_is_child_selected;
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260 iface.ref_selection = &AccessibleObject.atkSelection_ref_selection;
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261 }
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262
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263 private static extern(C) void initTextIfaceCB ( void* g_iface, void* iface_data ) {
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264 auto iface = cast(AtkTextIface*)g_iface;
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265 iface.get_caret_offset = &AccessibleObject.atkText_get_caret_offset;
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266 iface.get_character_at_offset = &AccessibleObject.atkText_get_character_at_offset;
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267 iface.get_character_count = &AccessibleObject.atkText_get_character_count;
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268 iface.get_n_selections = &AccessibleObject.atkText_get_n_selections;
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269 iface.get_selection = &AccessibleObject.atkText_get_selection;
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270 iface.get_text = &AccessibleObject.atkText_get_text;
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271 iface.get_text_after_offset = &AccessibleObject.atkText_get_text_after_offset;
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272 iface.get_text_at_offset = &AccessibleObject.atkText_get_text_at_offset;
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273 iface.get_text_before_offset = &AccessibleObject.atkText_get_text_before_offset;
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274 }
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275
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276 static void registerAccessible (Accessible accessible) {
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277 /* If DefaultParentType is 0 then OS accessibility is not active */
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278 if (DefaultParentType is 0) return;
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279 auto controlHandle = accessible.getControlHandle ();
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280 auto widgetType = OS.G_OBJECT_TYPE ( cast(GTypeInstance*)controlHandle);
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281 AccessibleFactory factory = Factories[widgetType];
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282 if (factory is null) {
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283 factory = new AccessibleFactory (widgetType);
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284 Factories[widgetType] = factory;
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285 }
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286 factory.addAccessible (accessible);
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287 }
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288
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289 void removeAccessible (Accessible accessible) {
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290 accessibles.remove (accessible.getControlHandle ());
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291 }
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292
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293 static void unregisterAccessible (Accessible accessible) {
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294 auto controlHandle = accessible.getControlHandle ();
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295 auto widgetType = OS.G_OBJECT_TYPE (cast(GTypeInstance*)controlHandle);
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296 AccessibleFactory factory = Factories[widgetType];
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297 if (factory !is null) {
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298 factory.removeAccessible (accessible);
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299 }
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300 }
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301 }
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