1 | package gov.va.med.edp.widget.accessibility
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2 | {
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3 | import gov.va.med.edp.widget.AutoComplete;
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4 |
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5 | import flash.accessibility.Accessibility;
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6 | import flash.events.Event;
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7 |
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8 | import mx.accessibility.ComboBoxAccImpl;
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9 | import mx.core.UIComponent;
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10 | import mx.core.mx_internal;
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11 |
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12 | use namespace mx_internal;
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13 |
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14 | /**
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15 | * The AutoCompleteAccImpl class is the accessibility class for
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16 | * Autocomplete component.
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17 | *
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18 | * @tiptext This is the AutoCompleteAccImpl Accessibility Class.
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19 | * @created by jtorreno 6.2.2008
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20 | */
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21 | public class AutoCompleteAccImpl extends ComboBoxAccImpl
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22 | {
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23 | /**
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24 | * @private
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25 | */
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26 | private var lastItemName:String = "No item selected";
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27 |
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28 |
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29 | /**
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30 | * @private
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31 | * Default Role of Autocomplete component.
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32 | */
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33 | private const ROLE_SYSTEM_TEXT:uint = 0x0000002A;
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34 |
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35 | /**
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36 | * @private
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37 | * Default state for all the components.
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38 | */
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39 | private static const STATE_SYSTEM_NORMAL:uint = 0x00000000;
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40 |
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41 | /**
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42 | * @private
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43 | */
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44 | private static const STATE_SYSTEM_FOCUSED:uint = 0x00000004;
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45 |
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46 | /**
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47 | * @private
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48 | */
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49 | private static const EVENT_OBJECT_FOCUS:uint = 0x8005;
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50 |
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51 | /**
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52 | * @private
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53 | */
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54 | private static const EVENT_OBJECT_VALUECHANGE:uint = 0x0000800e;
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55 |
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56 | /**
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57 | * @private
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58 | * Event emitted if 1 item is selected.
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59 | */
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60 | private static const EVENT_OBJECT_SELECTION:uint = 0x8006;
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61 |
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62 | /**
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63 | * Accessibility hookup
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64 | * @private
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65 | */
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66 | private static var accessibilityHooked:Boolean = hookAccessibility();
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67 |
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68 | /**
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69 | * Constructor
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70 | */
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71 | public function AutoCompleteAccImpl(master:UIComponent)
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72 | {
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73 | super(master);
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74 | }
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75 |
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76 | /**
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77 | * @private
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78 | * Method for creating the Accessibility class.
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79 | * This method is called from UIComponent.
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80 | * @review
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81 | */
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82 | mx_internal static function createAccessibilityImplementation(
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83 | component:UIComponent):void
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84 | {
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85 | component.accessibilityImplementation =
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86 | new AutoCompleteAccImpl(component);
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87 | }
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88 |
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89 | /**
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90 | * @private
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91 | * Static variable triggering the hookAccessibility() method.
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92 | * This is used for initializing AutoCompleteAccImpl class to hook its
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93 | * createAccessibilityImplementation() method to AutoComplete class
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94 | * before it gets called from UIComponent.
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95 | */
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96 | private static function hookAccessibility():Boolean
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97 | {
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98 | AutoComplete.createAccessibilityImplementation =
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99 | createAccessibilityImplementation;
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100 |
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101 | return true;
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102 | }
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103 |
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104 | /**
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105 | * Method call for enabling accessibility for a component.
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106 | * this method is required for the compiler to activate
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107 | * the accessibility classes for a component.
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108 | */
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109 | public static function enableAccessibility():void
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110 | {
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111 |
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112 | }
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113 |
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114 | /**
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115 | * @private
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116 | * method for returning the name of the Autocomplete
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117 | *
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118 | * @param childID uint
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119 | *
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120 | * @return Name String
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121 | * @review
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122 | */
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123 | override protected function getName(childID:uint):String
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124 | {
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125 | super.getName(childID);
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126 | var name:String = "";
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127 |
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128 | if (AutoComplete(master).selectedIndex == -1) {
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129 | name = AutoComplete(master).name ;
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130 | } else {
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131 | var lastSelectedIndx:int = AutoComplete(master).selectedIndex + 1;
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132 | name = "Item " + lastSelectedIndx +
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133 | " of " + AutoComplete(master).dataProvider.length;
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134 | }
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135 |
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136 | return name;
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137 | }
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138 |
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139 | /**
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140 | * @private
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141 | * Method for returning the value of the Autocomplete component
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142 | *
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143 | * @param childID uint
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144 | *
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145 | * @return Value String
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146 | * @review
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147 | */
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148 | override public function get_accValue(childID:uint):String
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149 | {
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150 | super.get_accValue(childID);
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151 | var accValue:String = "";
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152 | accValue = AutoComplete(master).value.toString();
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153 | return accValue;
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154 | }
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155 |
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156 | /**
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157 | * @private
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158 | * Method for returning the state of the Autocomplete component
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159 | *
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160 | * @param childID uint
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161 | *
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162 | * @return State uint
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163 | */
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164 | override public function get_accState(childID:uint):uint
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165 | {
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166 | var accState:uint = STATE_SYSTEM_NORMAL;
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167 |
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168 | if (AutoComplete(master).getFocus())
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169 | {
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170 | accState |= STATE_SYSTEM_FOCUSED;
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171 | }
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172 |
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173 | return accState;
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174 | }
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175 |
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176 | /**
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177 | * @private
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178 | * Gets the role for the component.
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179 | *
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180 | * @param childID uint.
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181 | */
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182 | override public function get_accRole(childID:uint):uint
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183 | {
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184 | return ROLE_SYSTEM_TEXT ;
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185 | }
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186 |
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187 | /**
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188 | * @private
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189 | * Array of events that we should listen for from the master component.
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190 | */
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191 | override protected function get eventsToHandle():Array
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192 | {
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193 | return super.eventsToHandle.concat(["valueCommit","change","enter","onFocus"]);
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194 | }
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195 |
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196 | /**
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197 | * @private
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198 | * Override the generic event handler.
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199 | * All AccImpl must implement this to listen for events
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200 | * from its master component.
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201 | */
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202 | override protected function eventHandler(event:Event):void
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203 | {
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204 | switch (event.type)
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205 | {
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206 | case "valueCommit":
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207 | {
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208 | Accessibility.sendEvent(master, 0, EVENT_OBJECT_FOCUS);
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209 | Accessibility.sendEvent(master, 0,EVENT_OBJECT_SELECTION);
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210 | //Accessibility.sendEvent(master, 0, EVENT_OBJECT_VALUECHANGE);
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211 | Accessibility.updateProperties();
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212 | break;
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213 | }
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214 | case "enter":
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215 | {
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216 | Accessibility.sendEvent(master, 0,EVENT_OBJECT_SELECTION);
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217 | Accessibility.updateProperties();
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218 | break;
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219 | }
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220 | case "change":
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221 | {
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222 | Accessibility.sendEvent(master, 0, EVENT_OBJECT_FOCUS);
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223 | Accessibility.sendEvent(master, 0, EVENT_OBJECT_VALUECHANGE);
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224 | Accessibility.updateProperties();
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225 | break;
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226 | }
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227 | case "onFocus":
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228 | {
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229 | Accessibility.sendEvent(master, 0, EVENT_OBJECT_FOCUS);
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230 | Accessibility.updateProperties();
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231 | break;
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232 | }
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233 |
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234 | }
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235 | }
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236 |
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237 | }
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238 | }
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