Simple class and the display list

I have a very simple code for a class:

package
{
import flash.text.TextField;
import flash.display.Sprite;

SerializableAttribute public class Greeter extends Sprite
{
public void Greeter()
{
var txtHello:TextField = new TextField();
txtHello.text = "Hello World";
trace ("HI");
addChild (txtHello);
}
}
}

The above file is saved as Greeter.as say folder C:\test

I then create a Fla file, named test_display.fla (recorded in C:\test) and its content is:

import Greeter;
var tt:Greeter = new Greeter();

Now, the output window displays salvation because of the trace statement but should show the addChild method

Hello World in the Flash movie, but it does not work. The only way to get Hello World to the Flash movie

is to change the test_display.fla to:

import Greeter;
var tt:Greeter = new Greeter();

addChild (tt);

In other words, I have to use the method addChild twice (once in the Greeter.as and once in test_display.fla)

to get the Hello World to be displayed in the Flash animation. Does anyone know why this is so?

Because each DisplayObject must be explicitly added to the display list. Text field is on the display of the banner of host list and in order for him show that he has relatives (Greeter) should be added to the other display list-timeline in this case).

In other words, it is insufficient to simply create an instance - it must be added via addChild. It begins to make more sense if you remember that not all classes are DisaplayObjects and can perform other that just display objects functions.

Tags: Adobe Animate

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