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Loading External Symbols During Playback
Author: Mark White | Website: http://www.entriq.com/ |

Step 2 - Create the main movie

First we'll create a place holder into which the library will be loaded.

1. Open a new flash project.
2. Choose Insert> New Symbol (or press F8). Name it "Empty" and click OK.
3. Draw a box (or whatever you like - it really doesn't matter) so that you'll be able to see the movie clip.
   
4. Go back to the main stage (click Scene 1 above the timeline).
5. Open the library window (Window> Library) drag the "Empty" movie onto the stage.
6. Open the "Instance" panel (Window> Panels> Instance) and give the instance the name "placeHolder". The name is case sensitive.

Add ActionScript to load the library.

1. Create a new layer in the timeline and name it "Actions".
2. Right click on the first frame of the "Actions" layer and from the menu choose Actions.
3. In the actions panel, add the following code:

placeHolder.loadMovie("library.swf");

Add ActionScript to wait until the library has been loaded.

Since it takes time for library.swf to download, we need to loop through some frames until the library has completely loaded, since the symbols contained in the library will not be available until downloading is complete. While it would be nice to put a proper loader in here, for brevity we'll do the minimum and just make the play-head loop over frames 2 & 3 until the library is loaded.

Once the library has been loaded we'll use the attachMovie command to load the symbols onto the stage.

1. Create a blank keyframe in frame 3 of the Actions layer. Clicking on frame 3 and pressing F6 should do the trick.
2. Extend the last frame on Layer1 to frame 3. Clicking on Layer1's frame 3 and pressing F5 will achieve this.
3. In the Actions panel (for frame 3 of the Actions layer) type:

if(placeHolder.getBytesLoaded() < placeHolder.getbytesTotal()) {
 prevFrame();
 play();
} else {
 placeHolder.attachMovie("line","myLine",2);
 placeHolder.attachMovie("circle","myCircle",3);
 placeHolder.attachMovie("box","myBox",4);
 placeHolder.myLine._x = -20;
 placeHolder.myCircle._y = 20;
 stop();
}

Play the movie (CTRL + Enter). You should see the line, the box and the circle loaded on the stage.

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