Actionscript 3.0 looping through stage and DisplayObject items

[clem_c_rok]

Actionscript 3.0 looping through stage and DisplayObject items

Hello,
   I'm trying to convert to Actionscript 3.0 and I'm trying to find out how to loop through Stage objects as well as DisplayObject.

With AS 2.0 - I would only have to do:

for(var i in _root) // or MovieClip, this, ect
{
    trace("i: " + i + " : " + _root.);
}

In AS 3.0 I found this equivalent which works w/ some objects:

public function debug_object(o:Object, show_all:Boolean):void
{
    import flash.utils.*;
    var def:XML       = describeType(o);
    var props:XMLList    = def..variable.@name;
    if(show_all)       props += def..accessor.@name;

    for each (var prop:String in props)
    {
        trace(prop + ": " + o[prop]);
    }
}

this.showChildren(Stage);

This kind of works but the o[prop] always traces undefined and it's not showing any movieClips on the stage.

I would like to be able to have the debug object function be able to take Stage and DisplayObject arguments like such:

this.debug_object(Stage, true);
this.debug_object(flash.display.DisplayObject, true);

Any ideas on how I could achieve this?

Thanks,
Clem C

[Guest]

You're processing Class objects, not instances:

this.debug_object(Stage, true);
this.debug_object(flash.display.DisplayObject, true);

Try sending the stage instance:

this.debug_object(this.stage, true);

Note: You'll need to handle errors, such as this:

Error: Error #2071: The Stage class does not implement this property or method.
at Error$/throwError()
at flash.display::Stage/get textSnapshot()
at Untitled_fla::MainTimeline/debug_object()
at Untitled_fla::MainTimeline/frame1()

[clem_c_rok]

Raymond,

    Big thanks for your help and great advice.    The only problem is that I'm trying to access the Stage from a class method and I get this error:

1119: Access of possibly undefined property stage through a reference with static type com:videoControl.

[Guest]

You'll need to wait until your com.VideoControl instance is added to the stage before you can run your procedure.

In your ctor, add something like this:

this.addEventListener(Event.ADDED_TO_STAGE, someHandler);

... and add a handler:

function someHandler(event:Event)

{

     if(event.type == Event.ADDED_TO_STAGE)

     {

          // do stuff here

     }

}

[Guest]

Oh... what is the superclass of com.VideoControl?

[clem_c_rok]

MovieClip is the superclass of videoControls.

[Guest]

Good. I thought perhaps you were using something other than a DisplayObject.

So you'll need to check that the stage property if not null before using it.

[clem_c_rok]

When I trace it  in the class - it's definitely null.      Is that because the class isn't  fully loaded at that time?

In as 2, I would do this in the constructor:

public function myClass()

{

    this.onLoad = init;

}

private function init():Void

{

}

[Guest]

There is always a lag from instanciation to the DisplayObject being added to the display list. You can either listen for Event.ADDED_TO_STAGE and then use the stage object, or Event.ENTER_FRAME and check that the stage value is not null.

[clem_c_rok]

Here's my code so far .     I can't get the this.addEventListener(Event.ADDED_TO_STAGE, init); to call init.

package com
{
    import flash.utils.Timer;
    import flash.events.Event;
    import flash.display.Stage;
    import flash.net.NetStream;
    import flash.net.URLLoader;
    import flash.net.URLRequest;
    import flash.net.SharedObject;
    import flash.net.NetConnection;
    import flash.display.MovieClip;
    import flash.display.DisplayObject;
   
    public class videoControl extends MovieClip
    {
        const BUFFER_TIME:Number = 8;                  // time to buffer for the video in sec.
        const SMOOTHING:Boolean    = true;              // smoothing for video. may slow down old computers
        const DEFAULT_VOLUME:Number    = 0.6;             // start volume when initializing player
        const DISPLAY_TIMER_UPDATE_DELAY:int = 10;  // update delay in milliseconds.
   
        private var objInfo:Object;
        private var xmlPlaylist:XML;
        private var mcVideoControls;           
        private var intActiveVid:int;
        private var nsStream:NetStream;
        private var ncConnection:NetConnection;
       
        private var strSource:String;     //fix: = _root.loaderInfo.parameters.playlist == null ? "playlist.xml" : root.loaderInfo.parameters.playlist;
        private var tmrDisplay:Timer;
        private var urlLoader:URLLoader;
        private var urlRequest:URLRequest;
        private var intLastVolume:Number = DEFAULT_VOLUME;
       
        private var thisStage:Stage;
        private var bolLoaded:Boolean = false;
        private var bolVolumeScrub:Boolean = false;
        private var bolProgressScrub:Boolean = false;
        private var bolDescriptionHover:Boolean = false;
        private var bolDescriptionHoverForward:Boolean = true;

       
        private var shoVideoPlayerSettings:SharedObject = SharedObject.getLocal("playerSettings");
       
        public function videoControl():void
        {
            this.addEventListener(Event.ADDED_TO_STAGE, init);

        };
       
       
        public function init(evnt:Event):void
        {
            trace("**(videoControl:init)** flash.display.DisplayObject.stage: " + Stage + " this.stage: " + this.stage);
        }
    }
}

[Guest]

How are you adding the object to the display list? Timeline? Code?

Try adding an ENTER_FRAME to check the stage

        public function videoControl():void
        {
            this.addEventListener(Event.ADDED_TO_STAGE, init);

          this.addEventListener(Event.ENTER_FRAME, checkStage);

        };
       
       
        public function init(evnt:Event):void
        {
            trace("**(videoControl:init)** flash.display.DisplayObject.stage: " + Stage + " this.stage: " + this.stage);
        }

        public function checkStage(evnt:Event):void
        {

          if(stage != null)

          {

               this.removeEventListener(Event.ENTER_FRAME, checkStage);

               trace("**ON STAGE**, stage);

          }

        }

[clem_c_rok]

That's probably a big part of the problem.    I want this class to control all things video.       I have a video screen laid out and all my controls.     I have code that worked in the timeline but I'm porting it all to a class as my first AS 3 project.

Right now I'm loading the class via this publishing class which I call in the properties panel:

package
{
    import com.videoControl;
    import flash.display.Sprite;
   
    public class loadVideo extends Sprite
    {
        private var thisVid:videoControl;
       
        public function loadVideo()
        {
            this.thisVid = new videoControl();
        }
    }
}

[clem_c_rok]

It's weird  - I can trace this.stage and it will show  [object Stage] but when I loop through the stage object I get this:

tabIndex: -1

visible: true

scaleX: 1

scaleY: 1

stageFocusRect: true

stageHeight: 365

showDefaultContextMenu: true

mask: null

fullScreenWidth: 0

focus: null

alpha: 1

scaleMode: noScale

mouseChildren: true

fullScreenSourceRect: null

align:

scale9Grid: null

numChildren: 1

width: 574

rotation: 0

fullScreenHeight: 0

blendMode: normal

I do not show any items that are on the stage.

Also when I add an event handler like this:

this.addEventListener(Event.ENTER_FRAME, this.testHandler);

and trace stage I get a perpetual null item.    When I trace the stage object before the evenlistener is declared, it prints out the stage object no problem?