Problem with classes and oop basics.

[pa-pavel]

I got a main class called "controll class":

There I addChild a btn to the stage and create a listener for click on that btn.

When clicked the function animated the curretn clip on the stage and moves it out and addChild another movieclip

called Levels_BG

Levels_BG contains at attached and controled but its onwl class: Levels_BG

Which creates a number of 'boxs' on the stage that can be clicked to select a level.

I am tryin to achieve this:

a level box is clicked in the Levels_BG and I need to pass this variable to another class.

Any help appriciated. sry if this is confussing.

Cheers Pavel

swf here:

http://www.2shared.com/document/pO8IIf4x/NumberGame.html

[kglad]

there are a number of ways to communicate among classes.  deciding which is best depends on some specifics.

for example, is there a simple relationship between Levels_BG and your other class?  eg, did your other class created the Levels_BG instance?

is there no simple relationship?  for example, i often use  Data class contains information that needs to be shared among several other classes like a setup class where a user selects parameters and those parameters are used in other classes to control the app.  in that situation, using a singleton Data class or static Data class makes sense.

i've never used more than one static/singleton class per app so most communication is not done via this global-type class.  some people think static/singleton classes should never be used.  but, i think, those are mostly teacher-types, not doers.

[pa-pavel]

Thx for the reply.

The relation ship between the 2 classes is that controll class addChild amovieclip to the stage that is attached to Levels_BG class.

Was think about using a static variable - but I need to run a function in Levels_BG that runs a function in controll class 

which essentially will removeChild the movie clip that's controlled by Levels_BG this is what I am trying my am getting an error:

in controll class:

public function startlevel ():void

                    {

                                   trace("from that class to this one")

                    }

in Levels_BG:

private static var controlCall:control_Class = new control_Class

controlCall.startlevel();

But this gives me this error:

Error #1009: Cannot access a property or method of a null object reference.

          at control_Class()

          at Levels_BG$cinit()

          at global$init()

Hope you can help.

thx pavel

ps. ' those are mostly teacher-types, not doers' - brilliant

[pa-pavel · Accepted solution]

Managed to get it working found htis brilliant guide:

http://stackoverflow.com/questions/11083843/as3-call-function-from-one-class-to-another

I changed my function in control_Class:

static public function startlevel ():void

                    {

                              trace("from that class to this one")

                    }

control_Class.startlevel();

thx for the help.

pav