external swf should unload when reaches final frame - actionscript-3

Question

I have a swf file loaded into a main movie. When the child is finished playing, ie reaches its final frame, I would like the swf to unload. Can anyone tell me what bits I can add to this code?
//start button
start_button_aboriginal.addEventListener(MouseEvent.CLICK, fl_ClickToLoadUnloadSWF_3,false,0,true);
import fl.display.ProLoader;
var fl_ProLoader_3:ProLoader;
var fl_ToLoad_3:Boolean = true;
function fl_ClickToLoadUnloadSWF_3(event:MouseEvent):void
{
//ADDED APR02 START
fl_ProLoader_3.contentLoaderInfo.addEventListener(Event.INIT, childInitHandler);
fl_ProLoader_3.load(new URLRequest("myths/myth_aboriginal.swf"));
//ADDED APR02 END
if(fl_ToLoad_3)
{
fl_ProLoader_3 = new ProLoader();
fl_ProLoader_3.load(new URLRequest("myths/myth_aboriginal.swf"));
addChild(fl_ProLoader_3);
fl_ProLoader_3.x = 114;
fl_ProLoader_3.y = 41;
}
else
{
removeChild(fl_ProLoader_3);
fl_ProLoader_3.unloadAndStop();
fl_ProLoader_3 = null;
}
// Toggle whether you want to load or unload the SWF
fl_ToLoad_3 = !fl_ToLoad_3;
}

Answer 1

You could
1) Use the undocumented addFrameScript function defined in the MovieClip class to place a callback on the last frame of the child SWF. Useful if you don't have control over the code in your loaded SWF.
addFrameScript() has the following signature:
addFrameScript(frameNumber, callback); //frameNumber is zero-based (unlike in the Flash authoring suite, here you would enter 0 to refer to the first frame, and 1 for the second.)
In the parent SWF, add the following:
function fl_ClickToLoadUnloadSWF_3(event:MouseEvent):void {
...
fl_ProLoader_3.contentLoaderInfo.addEventListener(Event.INIT, childInitHandler);
fl_ProLoader_3.load(new URLRequest("myths/myth_aboriginal.swf"));
...
}
function childInitHandler(event:Event):void {
MovieClip(fl_ProLoader_3.content).addFrameScript(MovieClip(fl_ProLoader_3.content).totalFrames-1, unloadChild);
}
function unloadChild() {
fl_ProLoader_3.unloadAndStop();
}
If you're worried about addFrameScript going away - don't be. When you put code on the timeline, all that code is actually compiled into functions in the document class, with frame listeners added via addFrameScript.
Remember to define function unloadChild().
function unloadChild():void {
fl_ProLoader_3.unloadAndStop();
}
-OR-
2) Dispatch an event from your loaded SWF when it reaches the final frame.
In last frame of child SWF:
this.dispatchEvent(new Event("lastFrameReached"));
In parent SWF, add the following:
fl_ProLoader_3.content.addEventListener("lastFrameReached", unloadChild);
-OR-
3) Subscribe to the ENTER_FRAME event of the child and check if the child is on its last frame.
In parent SWF, add the following:
fl_ProLoader_3.content.addEventListener(Event.ENTER_FRAME, checkIfEnded);
function checkIfEnded(event:Event):void {
if (fl_ProLoader_3.content.currentFrame == fl_ProLoader_3.content.totalFrames) {
unloadChild();
}
}
I personally prefer addFrameScript - seems to me a cleaner solution. Callback runs once, you don't have to poll and you don't need to modify the child SWF.

Answer 2

There are a number of ways to solve this, and it has been asked many times...
Unload child swf on last frame of child swf
When External SWF has reached Frame X, how do I unload it?
That said, one way you could resolve this without creating event listeners on the child swf, is by periodically checking the child swf for the current frame. If it's the last one on the swf, call the unload method.
// once every second, indefinitely.
var tick:Timer = new Timer(1000, 0);
tick.addEventListener(TimerEvent.TIMER, checkSWF);
tick.start();
//Load something to the stage.
var loader:Loader = new Loader();
loader.load(new URLRequest("child.swf"));
addChild(loader);
function checkSWF(e:Event):void {
if (loader.content.currentFrame == loader.content.totalFrames) {
tick.stop(); // stop the timer
loader.unloadAndStop();
}
}