source: EDIS/trunk/java/tracking-ui-core/src/main/flex/gov/va/med/edp/widget/accessibility/NumericStepperAccImpl.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
File size: 5.7 KB
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1package gov.va.med.edp.widget.accessibility
2{
3 import flash.accessibility.Accessibility;
4 import flash.events.Event;
5
6 import mx.accessibility.AccImpl;
7 import mx.core.UIComponent;
8 import mx.core.mx_internal;
9
10 import gov.va.med.edp.widget.AccessibleNumericStepper;
11
12 use namespace mx_internal;
13
14 /**
15 * The NumericStepperAccImpl class is the accessibility class
16 * the numericstepper component.
17 *
18 * @tiptext This is the NumericStepperAccImpl Accessibility Class.
19 * @created by jtorreno 6.2.2008
20 */
21 public class NumericStepperAccImpl extends AccImpl
22 {
23
24 /**
25 * @private
26 * Default role for numericstepper
27 */
28 private const ROLE_SYSTEM_TEXT:uint = 0x0000002A;
29
30 /**
31 * @private
32 * Default state for all the components.
33 */
34 private static const STATE_SYSTEM_NORMAL:uint = 0x00000000;
35
36 /**
37 * @private
38 */
39 private static const STATE_SYSTEM_FOCUSABLE:uint = 0x00100000;
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 * Accessibility hookup
59 */
60 private static var accessibilityHooked:Boolean = hookAccessibility();
61
62
63 /**
64 * Constructor
65 */
66 public function NumericStepperAccImpl(master:UIComponent)
67 {
68 super(master);
69 }
70
71 /**
72 * @private
73 * Method for creating the Accessibility class.
74 * This method is called from UIComponent.
75 * @review
76 */
77 mx_internal static function createAccessibilityImplementation(
78 component:UIComponent):void
79 {
80 component.accessibilityImplementation =
81 new NumericStepperAccImpl(component);
82 }
83
84 /**
85 * @private
86 * Static method for swapping the createAccessibilityImplementation()
87 * method of AccessibleNumericStepper with the NumericStepperAccImpl class.
88 */
89 private static function hookAccessibility():Boolean
90 {
91 AccessibleNumericStepper.createAccessibilityImplementation =
92 createAccessibilityImplementation;
93 return true;
94 }
95
96 /**
97 * Method call for enabling accessibility for a component.
98 * this method is required for the compiler to activate
99 * the accessibility classes for a component.
100 */
101 public static function enableAccessibility():void
102 {
103
104 }
105
106 /**
107 * @private
108 * Method for returning the name of the NumericStepper
109 *
110 * @param childID uint
111 *
112 * @return Name String
113 * @review
114 */
115 override protected function getName(childID:uint):String
116 {
117 var name:String = "";
118
119 name = AccessibleNumericStepper(master).name;
120
121 return name;
122 }
123
124 /**
125 * @private
126 * Method for returning the value of the NumericStepper
127 *
128 * @param childID uint
129 *
130 * @return Value String
131 * @review
132 */
133 override public function get_accValue(childID:uint):String
134 {
135 var accValue:String="";
136
137 accValue = AccessibleNumericStepper(master).value.toString();
138
139 return accValue;
140 }
141
142 /**
143 * @private
144 * IAccessible method for returning the state of the NumericStepper
145 *
146 * @param childID uint
147 *
148 * @return State uint
149 */
150 override public function get_accState(childID:uint):uint
151 {
152 var accState:uint = STATE_SYSTEM_NORMAL;
153
154 if (AccessibleNumericStepper(master).getFocus())
155 {
156 accState |= STATE_SYSTEM_FOCUSED;
157 }
158
159 return accState;
160 }
161
162 /**
163 * @private
164 * Gets the role for the component.
165 *
166 * @param childID uint.
167 */
168 override public function get_accRole(childID:uint):uint
169 {
170 return ROLE_SYSTEM_TEXT;
171 }
172
173 /**
174 * @private
175 * Array of events that we should listen for from the master component.
176 */
177 override protected function get eventsToHandle():Array
178 {
179 return super.eventsToHandle.concat(["numericStepperFocused","stepSizeChanged","stepSizeMouseClickChanged"]);
180 }
181
182 /**
183 * @private
184 * Override the generic event handler.
185 * All AccImpl must implement this to listen for events
186 * from its master component.
187 */
188 override protected function eventHandler(event:Event):void
189 {
190 //trace("&&&&&&&&&& Event Type: " + event.type);
191 switch (event.type)
192 {
193 /* tell JAWS to update and reread the information */
194 case "stepSizeChanged":
195 {
196 Accessibility.sendEvent(master, 0, EVENT_OBJECT_FOCUS);
197 Accessibility.sendEvent(master, 0, EVENT_OBJECT_VALUECHANGE);
198 Accessibility.updateProperties();
199 break;
200 }
201 case "stepSizeMouseClickChanged":
202 {
203 Accessibility.sendEvent(master, 0, EVENT_OBJECT_FOCUS);
204 //Accessibility.sendEvent(master, 0, EVENT_OBJECT_STATECHANGE);
205 Accessibility.sendEvent(master, 0, EVENT_OBJECT_VALUECHANGE);
206 Accessibility.updateProperties();
207 break;
208 }
209 case "numericStepperFocused":
210 {
211 Accessibility.sendEvent(master, 0, EVENT_OBJECT_FOCUS);
212 Accessibility.sendEvent(master, 0, EVENT_OBJECT_VALUECHANGE);
213 Accessibility.updateProperties();
214 break;
215 }
216
217 }
218 }
219
220 }
221}
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