white master replace with a graphic 5.5 tall &4.3 wide copyright 2009 adobe systems...
TRANSCRIPT
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 3
Flash accessibility architecture
MSAA
Flash Player
Flex SDK
Flash contentFlex content
Assistive technology
Flash components
Custom Flashcontent
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 4
AccessibilityProperties object
name
description
silent
forceSimple
shortcut
noAutoLabeling
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 5
AccessibilityProperties.name and .description
AccessibilityProperties.name Labeling information for the object.
AccessibilityProperties.description Additional information on the object.
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 6
AccessibilityProperties.silent and .forceSimple
AccessibilityProperties.silent Used to make the movie clip or root movie inaccessible to assistive
technologies.
AccessibilityProperties.forceSimple Used to hide all child objects for a object, resulting in a single accessible
object
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 7
What you see when you can’t see
Flash movie start
Flash movie end
Bicycle
Wheel
Frame
Gears
Other Wheel
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 8
Using forceSimple
Flash movie start
Flash movie end
Bicycle
Wheel
Frame
Gears
Other Wheel
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 9
Other accessibility-related code
Capabilities.hasAccessibility
Accessibility.isActive() Takes 2 seconds to handshake
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 10
AccessibilityProperties.shortcut and .noAutoLabeling
AccessibilityProperties.shortcut Cue for the screen reader
Does not give the object that shortcut!
AccessibilityProperties.noAutoLabeling Used to toggle the Flash player’s ability to assign accessibility names
automatically. If this property is disabled, developers need to assign names for all objects
Only defined at the root movie level
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 11
Accessible Flash components
SimpleButton
CheckBox
RadioButton
Label
TextInput
TextArea
ComboBox
ListBox
Window
Alert
DataGrid
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 12
Enabling component accessibility
import fl.accessibility.ComboBoxAccImpl;
ComboBoxAccImpl.enableAccessibility();
Use Accessibility.updateProperties() to refresh Flash content when it’s modified.
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 13
Testing Flash for Accessibility
Designers are often visual in their way of looking at the world
Devote time to learning the screen reader, then use it
Test for accessibility are regular intervals Test for screen reader access at least twice a day
Test other use cases at least once a week (more often on compressed schedules)
Involve people with disabilities in the process User testing for large scale projects
Email based feedback for smaller projects
13
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 14
Controlling Tab and Reading Order
Inspect32 / AccExplorer32 Demo
Quick tools for identifying reading order, object names, and role and state information
14
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 15
Controlling Tab and Reading Order
Ensure objects are read in a sensible order The tab order for a Flash or Flex application is used to
determine the order of the items in the MSAA tree, which is used for the reading order
The MSAA tree is used in the same way that JAWS uses the DOM for HTML reading order.
Use MSAA inspector tools and a screen reader to: ensure labels are read before controls ensure any instructions for controls are read before
controls themselves
15
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 16
Controlling Tab and Reading Order
Controlling reading order is different from controlling what the user reads
Flash allows the focus to be programmatically moved, screen readers will respond to this in “forms” mode only.
Screen readers maintain an off-screen model which is followed instead of the system focus, except in forms mode.
16
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 17
Provide Structure, Role, and State Information
Screen reader user should know what every control does Buttons must be correctly
identified
Controls emulating standard windows controls should be identified appropriately
Unusual controls should provide cues to users as to their identification, operation and state information
Flash CS4’s UI components handle role for you.
17
®
Copyright 2009 Adobe Systems Incorporated. All rights reserved. Adobe confidential. 18
Provide Structure, Role, and State Information
Every control should indicate state:
Current selection.
Number of possible selections.
Update when selection changes.
Flash CS4’s UI components handle state for you.
18