ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Working with movie clips
package com.example.programmingas3.runtimeassetexplorer
{
import flash.display.MovieClip;
}
public class AnimatingStar extends MovieClip
{
public function AnimatingStar() {
}
}
Publishing the library
We’ll now connect the MovieClip-based assets to the new class by creating a new FLA and entering GeometricAssets
into the Document Class field of the Property inspector. For the purposes of this example, we’ll create two very basic
shapes that use a timeline tween to make one clockwise rotation over 360 frames. Both the animatingBox and
animatingStar symbols are set to Export for ActionScript and have the Class field set to the respective classpaths
specified in the getAssets() implementation. The default base class of flash.display.MovieClip remains, as we
want to subclass the standard MovieClip methods.
After setting up your symbol’s export settings, publish the FLA. You now have your first run-time library. This SWF
file could be loaded into another AVM2 SWF file and the AnimatingBox and AnimatingStar symbols would be
available to the new SWF file.
Loading the library into another SWF file
Flash Player 9 and later, Adobe AIR 1.0 and later
The last functional piece to deal with is the user interface for the asset explorer. In this example, the path to the runtime
library is hard-coded as a variable named ASSETS_PATH. Alternatively, you could use the FileReference class—for
example, to create an interface that browses for a particular SWF file on your hard drive.
When the run-time library is successfully loaded, Flash Player calls the runtimeAssetsLoadComplete() method:
private function runtimeAssetsLoadComplete(event:Event):void
{
var rl:* = event.target.content;
var assetList:Array = rl.getAssets();
populateDropdown(assetList);
stage.frameRate = 60;
}
In this method, the variable rl represents the loaded SWF file. The code calls the getAssets() method of the loaded
SWF file, obtaining the list of assets that are available, and uses them to populate a ComboBox component with a list
of available assets by calling the populateDropDown() method. That method in turn stores the full classpath of each
asset. Clicking the Add button on the user interface triggers the addAsset() method:
Last updated 6/6/2012
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