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CHAPTER 4: User-Interface Tools Communicating with the Flash application 85

the bubbling phase. For example, the following click handler, registered with the parent dialog object,

responds only in the capture phase:

myDialog.addEventListener("click", handleAllItems, true);

This value is false by default, so if it is not supplied, the handler can respond only in the bubbling phase

when the object’s descendent is the target, or when the object is itself the target of the event (the

at-target phase).

To distinguish which of multiple registered handlers is being executed at any given time, the event object

provides the eventPhase

property, and the currentTarget property, which In the capture and bubbling

phases contains the ancestor of the

target object at which the currently executing handler was

registered.

Communicating with the Flash application

ScriptUI supports a Flash Player, which runs the Flash application within a window in an Adobe

application. The Flash application runs ActionScript, a different implementation of JavaScript from the

ExtendScript version of JavaScript that Adobe applications run.

To open a Flash Player, add a control of type flashplayer

to your ScriptUI window. A control object of this

type contains functions that allow your script to load SWF files and control movie playback. It also contains

functions that allow your Adobe application script to communicate with the ActionScript environment of

the Flash application. See “

FlashPlayer control functions” on page 145.

A limited set of data types can be passed between the two scripting environments:

Number

String

Boolean

Null

undefined

Object

Array

The ActionScript class and date objects are not supported as parameter values.

In the ActionScript script for your Flash application, you must prepare for two-way communication by

providing access to the External API. Do this by importing the

ExternalInterface class into your Flash

application:

import flash.external.ExternalInterface;

Calling ExtendScript functions from ActionScript

The ActionScript ExternalInterface class allows you to call an ExtendScript function that has been

defined in the

FlashPlayer element in the Adobe application script, and run it in the ActionScript

environment. You must define the method in your FlashPlayer

element with a matching function name.

For example, in order for the SWF code to call an ExtendScript function named

myExtendScriptFunction,

define a function with the name

myExtendScriptFunction as a method of your FlashPlayer control

object. There are no special requirements for function names, but the function must take and return only

data of the supported types.

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