| //////////////////////////////////////////////////////////////////////////////// |
| // |
| // Licensed to the Apache Software Foundation (ASF) under one or more |
| // contributor license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright ownership. |
| // The ASF licenses this file to You under the Apache License, Version 2.0 |
| // (the "License"); you may not use this file except in compliance with |
| // the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| package spark.accessibility |
| { |
| |
| import flash.accessibility.Accessibility; |
| import flash.events.FocusEvent; |
| import flash.events.Event; |
| |
| import mx.accessibility.AccConst; |
| import mx.core.UIComponent; |
| import mx.core.mx_internal; |
| |
| import spark.components.NumericStepper; |
| import spark.components.TextInput; |
| import spark.events.SkinPartEvent; |
| |
| use namespace mx_internal; |
| |
| /** |
| * NumericStepperAccImpl is the accessibility implementation class |
| * for spark.components.NumericStepper. |
| * |
| * <p>When a Spark NumericStepper is created, |
| * its <code>accessibilityImplementation</code> property |
| * is set to an instance of this class. |
| * The Flash Player then uses this class to allow MSAA clients |
| * such as screen readers to see and manipulate the NumericStepper. |
| * See the mx.accessibility.AccImpl and |
| * flash.accessibility.AccessibilityImplementation classes |
| * for background information about accessibility implementation |
| * classes and MSAA.</p> |
| * |
| * <p><b>Children</b></p> |
| * |
| * <p>A NumericStepper has two MSAA children, |
| * which are its increment and decrement buttons.</p> |
| * |
| * <p><b>Role</b></p> |
| * |
| * <p>The MSAA Role of a NumericStepper is ROLE_SYSTEM_TEXT.</p> |
| * |
| * <p>The Role of each child button is ROLE_SYSTEM_PUSHBUTTON.</p> |
| * |
| * <p><b>Name</b></p> |
| * |
| * <p>The MSAA Name of a NumericStepper is, by default, an empty string. |
| * When wrapped in a FormItem element, the Name is the FormItem's label. |
| * To override this behavior, |
| * set the NumericStepper's <code>accessibilityName</code> property.</p> |
| * |
| * <p>The Name of each child button comes from a locale-dependent resource. |
| * For the en_US locale, the names are "More" and "Less".</p> |
| * |
| * <p>When the Name of the NumericStepper or one of its child button changes |
| * a NumericStepper dispatches the MSAA event EVENT_OBJECT_NAMECHANGE |
| * with the proper childID for the button or 0 for itself.</p> |
| * |
| * <p><b>Description</b></p> |
| * |
| * <p>The MSAA Description of a NumericStepper is, by default, an empty string, |
| * but you can set the NumericStepper's <code>accessibilityDescription</code> |
| * property.</p> |
| * |
| * <p>The Description of each child button is the empty string.</p> |
| * |
| * <p><b>State</b></p> |
| * |
| * <p>The MSAA State of a NumericStepper is a combination of: |
| * <ul> |
| * <li>STATE_SYSTEM_UNAVAILABLE (when enabled is false)</li> |
| * <li>STATE_SYSTEM_FOCUSABLE (when enabled is true)</li> |
| * <li>STATE_SYSTEM_FOCUSED |
| * (when enabled is true and the Spinner has focus)</li> |
| * </ul></p> |
| * |
| * <p>When the State of the NumericStepper or one of its child buttons changes, |
| * a NumericStepper dispatches the MSAA event EVENT_OBJECT_STATECHANGE |
| * with the proper childID for the button or 0 for itself.</p> |
| * |
| * <p><b>Value</b></p> |
| * |
| * <p>The MSAA Value of a NumericStepper is the value |
| * currently held by the NumericStepper.</p> |
| * |
| * <p>The child buttons do not have MSAA values.</p> |
| * |
| * <p>When the Value of the NumericStepper changes, |
| * the NumericStepper dispatches the MSAA event EVENT_OBJECT_VALUECHANGE.</p> |
| * |
| * <p><b>Location</b></p> |
| * |
| * <p>The MSAA Location of a NumericStepper, or one of its child buttons, |
| * is its bounding rectangle.</p> |
| * |
| * <p><b>Default Action</b></p> |
| * |
| * <p>A NumericStepper does not have an MSAA DefaultAction.</p> |
| * |
| * <p>The DefaultAction of each child button is "Press".</p> |
| * |
| * <p>Performing the default action of one of the child buttons |
| * will increment or decrement the value.</p> |
| * |
| * <p><b>Focus</b></p> |
| * |
| * <p>A NumericStepper accepts focus. |
| * When it does so, it dispatches the MSAA event EVENT_OBJECT_FOCUS.</p> |
| * |
| * <p><b>Selection</b></p> |
| * |
| * <p>A NumericStepper does not support selection in the MSAA sense.</p> |
| * |
| * @langversion 3.0 |
| * @playerversion Flash 10 |
| * @playerversion AIR 1.5 |
| * @productversion Flex 4 |
| */ |
| public class NumericStepperAccImpl extends SpinnerAccImpl |
| { |
| include "../core/Version.as"; |
| |
| //-------------------------------------------------------------------------- |
| // |
| // Class methods |
| // |
| //-------------------------------------------------------------------------- |
| |
| /** |
| * Enables accessibility in the Spinner class. |
| * |
| * <p>This method is called by application startup code |
| * that is autogenerated by the MXML compiler. |
| * Afterwards, when instances of Spinner are initialized, |
| * their <code>accessibilityImplementation</code> property |
| * will be set to an instance of this class.</p> |
| * |
| * @langversion 3.0 |
| * @playerversion Flash 10 |
| * @playerversion AIR 1.5 |
| * @productversion Flex 4 |
| */ |
| public static function enableAccessibility():void |
| { |
| NumericStepper.createAccessibilityImplementation = |
| createAccessibilityImplementation; |
| } |
| |
| /** |
| * @private |
| * Creates a Spinner's AccessibilityImplementation object. |
| * This method is called from UIComponent's |
| * initializeAccessibility() method. |
| */ |
| mx_internal static function createAccessibilityImplementation( |
| component:UIComponent):void |
| { |
| component.accessibilityImplementation = |
| new NumericStepperAccImpl(component); |
| } |
| |
| //-------------------------------------------------------------------------- |
| // |
| // Constructor |
| // |
| //-------------------------------------------------------------------------- |
| |
| /** |
| * Constructor. |
| * |
| * @param master The UIComponent instance that this AccImpl instance |
| * is making accessible. |
| * |
| * @langversion 3.0 |
| * @playerversion Flash 10 |
| * @playerversion AIR 1.5 |
| * @productversion Flex 4 |
| */ |
| public function NumericStepperAccImpl(master:UIComponent) |
| { |
| super(master); |
| |
| role = AccConst.ROLE_SYSTEM_TEXT; |
| |
| // NumericStepper has a TextInput as a skin part, |
| // and we need to listen to some of its events. |
| // It may or may not be present when this constructor is called. |
| // If it comes or goes later, we are notified via |
| // "partAdded" and "partRemoved" events. |
| var textDisplay:TextInput = NumericStepper(master).textDisplay; |
| if (textDisplay) |
| { |
| textDisplay.addEventListener(Event.CHANGE, eventHandler); |
| textDisplay.addEventListener(FocusEvent.FOCUS_IN, focusInHandler); |
| } |
| } |
| |
| //-------------------------------------------------------------------------- |
| // |
| // Overridden properties: AccImpl |
| // |
| //-------------------------------------------------------------------------- |
| |
| //---------------------------------- |
| // eventsToHandle |
| //---------------------------------- |
| |
| /** |
| * @private |
| * Array of events that we should listen for from the master component. |
| */ |
| override protected function get eventsToHandle():Array |
| { |
| return super.eventsToHandle.concat([ SkinPartEvent.PART_ADDED, |
| SkinPartEvent.PART_REMOVED ]); |
| } |
| |
| //-------------------------------------------------------------------------- |
| // |
| // Overridden event handlers: AccImpl |
| // |
| //-------------------------------------------------------------------------- |
| |
| /** |
| * @private |
| * Override the generic event handler. |
| * All AccImpl must implement this |
| * to listen for events from its master component. |
| */ |
| override protected function eventHandler(event:Event):void |
| { |
| var textDisplay:TextInput; |
| |
| switch (event.type) |
| { |
| case SkinPartEvent.PART_ADDED: |
| { |
| textDisplay = NumericStepper(master).textDisplay; |
| if (SkinPartEvent(event).instance == textDisplay) |
| { |
| textDisplay.addEventListener(Event.CHANGE, |
| eventHandler); |
| textDisplay.addEventListener(FocusEvent.FOCUS_IN, |
| focusInHandler); |
| } |
| break; |
| } |
| |
| case SkinPartEvent.PART_REMOVED: |
| { |
| textDisplay = NumericStepper(master).textDisplay; |
| if (SkinPartEvent(event).instance == textDisplay) |
| { |
| textDisplay.removeEventListener(Event.CHANGE, |
| eventHandler); |
| textDisplay.removeEventListener(FocusEvent.FOCUS_IN, |
| focusInHandler); |
| } |
| break; |
| } |
| |
| default: |
| { |
| super.eventHandler(event); |
| } |
| } |
| } |
| |
| //-------------------------------------------------------------------------- |
| // |
| // Event handlers |
| // |
| //-------------------------------------------------------------------------- |
| |
| /** |
| * @private |
| */ |
| private function focusInHandler(event:Event):void |
| { |
| Accessibility.sendEvent(master, 0, AccConst.EVENT_OBJECT_FOCUS); |
| } |
| } |
| |
| } |