source: EDIS/trunk/java/tracking-ui-core/src/main/flex/gov/va/med/edp/widget/accessibility/AutoCompleteAccImpl.as@ 1227

Last change on this file since 1227 was 1227, checked in by George Lilly, 13 years ago

initial load of EDIS 1.0
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1package gov.va.med.edp.widget.accessibility
2{
3 import gov.va.med.edp.widget.AutoComplete;
4
5 import flash.accessibility.Accessibility;
6 import flash.events.Event;
7
8 import mx.accessibility.ComboBoxAccImpl;
9 import mx.core.UIComponent;
10 import mx.core.mx_internal;
11
12 use namespace mx_internal;
13
14 /**
15 * The AutoCompleteAccImpl class is the accessibility class for
16 * Autocomplete component.
17 *
18 * @tiptext This is the AutoCompleteAccImpl Accessibility Class.
19 * @created by jtorreno 6.2.2008
20 */
21 public class AutoCompleteAccImpl extends ComboBoxAccImpl
22 {
23 /**
24 * @private
25 */
26 private var lastItemName:String = "No item selected";
27
28
29 /**
30 * @private
31 * Default Role of Autocomplete component.
32 */
33 private const ROLE_SYSTEM_TEXT:uint = 0x0000002A;
34
35 /**
36 * @private
37 * Default state for all the components.
38 */
39 private static const STATE_SYSTEM_NORMAL:uint = 0x00000000;
40
41 /**
42 * @private
43 */
44 private static const STATE_SYSTEM_FOCUSED:uint = 0x00000004;
45
46 /**
47 * @private
48 */
49 private static const EVENT_OBJECT_FOCUS:uint = 0x8005;
50
51 /**
52 * @private
53 */
54 private static const EVENT_OBJECT_VALUECHANGE:uint = 0x0000800e;
55
56 /**
57 * @private
58 * Event emitted if 1 item is selected.
59 */
60 private static const EVENT_OBJECT_SELECTION:uint = 0x8006;
61
62 /**
63 * Accessibility hookup
64 * @private
65 */
66 private static var accessibilityHooked:Boolean = hookAccessibility();
67
68 /**
69 * Constructor
70 */
71 public function AutoCompleteAccImpl(master:UIComponent)
72 {
73 super(master);
74 }
75
76 /**
77 * @private
78 * Method for creating the Accessibility class.
79 * This method is called from UIComponent.
80 * @review
81 */
82 mx_internal static function createAccessibilityImplementation(
83 component:UIComponent):void
84 {
85 component.accessibilityImplementation =
86 new AutoCompleteAccImpl(component);
87 }
88
89 /**
90 * @private
91 * Static variable triggering the hookAccessibility() method.
92 * This is used for initializing AutoCompleteAccImpl class to hook its
93 * createAccessibilityImplementation() method to AutoComplete class
94 * before it gets called from UIComponent.
95 */
96 private static function hookAccessibility():Boolean
97 {
98 AutoComplete.createAccessibilityImplementation =
99 createAccessibilityImplementation;
100
101 return true;
102 }
103
104 /**
105 * Method call for enabling accessibility for a component.
106 * this method is required for the compiler to activate
107 * the accessibility classes for a component.
108 */
109 public static function enableAccessibility():void
110 {
111
112 }
113
114 /**
115 * @private
116 * method for returning the name of the Autocomplete
117 *
118 * @param childID uint
119 *
120 * @return Name String
121 * @review
122 */
123 override protected function getName(childID:uint):String
124 {
125 super.getName(childID);
126 var name:String = "";
127
128 if (AutoComplete(master).selectedIndex == -1) {
129 name = AutoComplete(master).name ;
130 } else {
131 var lastSelectedIndx:int = AutoComplete(master).selectedIndex + 1;
132 name = "Item " + lastSelectedIndx +
133 " of " + AutoComplete(master).dataProvider.length;
134 }
135
136 return name;
137 }
138
139 /**
140 * @private
141 * Method for returning the value of the Autocomplete component
142 *
143 * @param childID uint
144 *
145 * @return Value String
146 * @review
147 */
148 override public function get_accValue(childID:uint):String
149 {
150 super.get_accValue(childID);
151 var accValue:String = "";
152 accValue = AutoComplete(master).value.toString();
153 return accValue;
154 }
155
156 /**
157 * @private
158 * Method for returning the state of the Autocomplete component
159 *
160 * @param childID uint
161 *
162 * @return State uint
163 */
164 override public function get_accState(childID:uint):uint
165 {
166 var accState:uint = STATE_SYSTEM_NORMAL;
167
168 if (AutoComplete(master).getFocus())
169 {
170 accState |= STATE_SYSTEM_FOCUSED;
171 }
172
173 return accState;
174 }
175
176 /**
177 * @private
178 * Gets the role for the component.
179 *
180 * @param childID uint.
181 */
182 override public function get_accRole(childID:uint):uint
183 {
184 return ROLE_SYSTEM_TEXT ;
185 }
186
187 /**
188 * @private
189 * Array of events that we should listen for from the master component.
190 */
191 override protected function get eventsToHandle():Array
192 {
193 return super.eventsToHandle.concat(["valueCommit","change","enter","onFocus"]);
194 }
195
196 /**
197 * @private
198 * Override the generic event handler.
199 * All AccImpl must implement this to listen for events
200 * from its master component.
201 */
202 override protected function eventHandler(event:Event):void
203 {
204 switch (event.type)
205 {
206 case "valueCommit":
207 {
208 Accessibility.sendEvent(master, 0, EVENT_OBJECT_FOCUS);
209 Accessibility.sendEvent(master, 0,EVENT_OBJECT_SELECTION);
210 //Accessibility.sendEvent(master, 0, EVENT_OBJECT_VALUECHANGE);
211 Accessibility.updateProperties();
212 break;
213 }
214 case "enter":
215 {
216 Accessibility.sendEvent(master, 0,EVENT_OBJECT_SELECTION);
217 Accessibility.updateProperties();
218 break;
219 }
220 case "change":
221 {
222 Accessibility.sendEvent(master, 0, EVENT_OBJECT_FOCUS);
223 Accessibility.sendEvent(master, 0, EVENT_OBJECT_VALUECHANGE);
224 Accessibility.updateProperties();
225 break;
226 }
227 case "onFocus":
228 {
229 Accessibility.sendEvent(master, 0, EVENT_OBJECT_FOCUS);
230 Accessibility.updateProperties();
231 break;
232 }
233
234 }
235 }
236
237 }
238}
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