MACROMEDIA FLASH 8-FLASH, Руководство пользователя, Страница: 528 / 678

528 Creating Accessible Content
About animation and accessibility for the
visually impaired
In some situations, you may want to change the property of an accessible object during movie
playback. For example, you might want to indicate changes that take place on a keyframe in
an animation. However, different vendor’s screen readers treat new objects on frames
differently. Some screen readers may read only the new object, whereas other screen readers
may re-read the entire document.
To reduce the chance of causing a screen reader to emit extra “chatter” that can annoy users,
try to avoid animating the text, buttons, and input text fields in your document. Also, it’s best
to avoid making your Flash content loop.
Be aware that if you’re using features such as Text Break Apart to animate text, Flash Player
can’t determine the actual text content of that text. Also, be aware of information-carrying
graphics such as icons and gestural animations. Screen readers can only provide accurate
accessibility to such objects if you provide names and descriptions for these objects within
your document or for the entire Flash application. You can also add supplementary text into
your document or shift important content from graphics to text. See
“Making an entire Flash
application accessible” on page 524 .
To update properties for an accessible object:
1. Display the frame in which you want to change the properties.
2. Do one of the following:
■
Select Window > Properties if the inspector is not visible. In the Property inspector,
click the Accessibility button.
■
Select Window > Other Panels > Accessibility.
3. In the Accessibility panel, change the properties for the object as needed.
Alternatively, you can use ActionScript to update accessibility properties. See “Creating
accessibility with ActionScript” on page 530 .