Adobe Flash Professional CS3 Manual de usuario descargar pdf (Pagina 371)

FLASH CS3

User Guide

365

For example, you could use the Accessibility.isActive() method to decide whether to include unsolicited

animation. Unsolicited animation happens without the screen reader doing anything, which can be confusing for

screen readers.

The

Accessibility.isActive() method provides asynchronous communication between the Flash content and

Flash Player; a slight real-time delay can occur between the time the method is called and the time when Flash Player

becomes active, returning an incorrect value of

false. To ensure that the method is called correctly, do one of the

following:

• Instead of using the Accessibility.isActive() method when the Flash content first plays, call the method

whenever you need to make a decision about accessibility.

• IntroduceashortdelayofoneortwosecondsatthebeginningofyourdocumenttogivetheFlashcontentenough

time to contact Flash Player.

Forexample,youcanusean

onFocus event to attach this method to a button. This approach generally gives the SWF

file enough time to load and you can assume a screen reader user will tab to the first button or object on the Stage.

Use ActionScript to create a tab order for accessible objects

To create the tab order with ActionScript code, assign the tabIndex property to the following objects:

• Dynamic text

• Input text

• Buttons

• Movie clips, including compiled movie clips

• Timeline frames

• Screens

Provide a complete tab order for all accessible objects. If you create a tab order for a frame and you don’t specify a

tab order for an accessible object in the frame, Flash Player ignores all the custom tab-order assignments.

Additionally, all objects assigned to a tab order, except frames, must have an instance name specified in the Instance

Name text field of the Property inspector. Even items that are not tab stops, such as text, need to be included in the

tab order if they are to be read in that order.

Becausestatictextcannotbeassignedaninstancename,itcannotbeincludedinthelistofthe

tabIndex property

values. As a result, a single instance of static text anywhere in the SWF file causes the reading order to revert to the

default.

To specify a tab order, assign an order number to the

tabIndex property, as the following example shows:

_this.myOption1.btn.tabIndex = 1

_this.myOption2.txt.tabIndex = 2

See tabIndex in Button, MovieClip, and TextField in the ActionScript 2.0 Language Reference.

You can also use the

tabChildren() or tabEnabled() methods to assign custom tab order. See

MovieClip.tabChildren, MovieClip.tabEnabled, and TextField.tabEnabled in the ActionScript 2.0

Language Reference.

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