AS3：访问动画片段按钮

Question

I was trying to access movieclip located in a button, which i refer by this code:

var buttonObject = this[weaponsPurchased[i]];

Then i'm setting "mouseEnabled" false (that part works)

buttonObject.mouseEnabled = false;

And then i'm trying to set a movieclip inside this button unvisible (and that doesn't work)

buttonObject["square"].visible = false;

I get this error:

ReferenceError: Error #1069: Property square not found on flash.display.SimpleButton and there is no default value. at (...)

I didn't find any help on the internet, so please help me. What am i doing wrong?

Answer 1

You can not access child elements of a SimpleButton. SimpleButtons are not DisplayObjectContainers, yet they can have child elements when being created from the Flash IDE.

Source: http://xtyler.com/as3-simple-button-breaking-all-rules/

I would just go with a MovieClip instead with your own class to handle MouseOver and MouseOut events. A good tutorial outlines the creation of a reusable button class that extends MovieClip.

http://www.ironcoding.com/2011/02/flash-as3-movieclip-button-tutorial/

Answer 2

I had this problem a while ago. What I did was to search for the DisplayObject inside of each state of the button. I'll drop some code here that might help you. You must realize that if your button have objects in all four frames, you will find your object in all the states as well.

    private var Obj1:DisplayObject, Obj2:DisplayObject, 
    Obj3:DisplayObject, Obj2:DisplayObject;

    private function searchInChildren(spr:DisplayObject, name:String):void
    {
        for (var i:int = 0; i < spr.numChildren; i++) 
        {
            if(spr.getChildAt(i).name == name)
            {
                return spr.getChildAt(i);
            }           
        }
        return null;
    }

    public function searchControllers(_ref:SimpleButton, name:String):void
    {   
        try{
            Obj1 = searchInChildren(_ref.upState, name);
            Obj2 = searchInChildren(_ref.overState, name);
            Obj3 = searchInChildren(_ref.downState, name);
            Obj4 = searchInChildren(_ref.hitTestState, name);
        } catch (e:Error) {
            trace("error: "+e+", when trying to search for controllers");
        }
    }