Question

Scroll bar animation with forward and back buttons only?

Asked by: worked

Hey there-

I have a Sprite that when wider than the stage creates and displays two buttons, a forward and back button.  So far this successfully scrolls the Sprite across the screen in either direction.  But what if I wanted to create bounds for the scroll animation?  

For instance, stop the animation from moving any further left if the Sprite.width crosses a certain point or vise versa, disallow the Sprite.x to move forward from the stage's 0 X origin? Oh and grey out the buttons when one is rendered useless in terms of the bounds created.  

Thanks! Any help is appreciated!  I attached a .gif for visual purposes.

var containerObj:Sprite = new Sprite();
containerObj.x = 0;
containerObj.y = 0;
containerObj.width = 400;
//stage.stageWidth = 300;
 
checkBounds();
 
function checkBounds():void {
	if (containerObj.width >= stage.stageWidth) {
		displaySliders();
	}
}
 
function displaySliders():void {
	var btnContainer Sprite = new Sprite();
	var forBtn:Sprite = new Sprite();
	var backBtn:Sprite = new Sprite();
	foBtn.width = 20
	backBtn.width = 20;
	forBtn.x = 0;
	backBtn.x = forBtn.width;
	addChild(btnContainer);
	btnContainer.addChild(forBtn);
	btnContainer.addChild(backBtn);
	btn.addEventListener(MouseEvent.CLICK, clickBtn);
}
 
var begin:Number = containerObj.x;
var finish:Number = 0;
 
private function clickBtn(evt:MouseEvent):void {
	beginPos = containerObj.x;
	finishPosR = containerObj.x - 40;
	finishPosL = containerObj.x + 40;
	
	if (evt.target==lBtn) {
		var myTween1:Tween=new Tween(containerObj,"x",Strong.easeOut,beginPos,finishPosL,.5,true);
	}
	if (evt.target==rBtn) {
		var myTween2:Tween=new Tween(containerObj,"x",Strong.easeOut,beginPos,finishPosR,.5,true);
		}
	}
}
                                  
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Asked On
2009-02-12 at 09:46:44ID24138181
Tags

actionscript 3

,

Flash

,

dynamic animation

,

AppleScript

Topic

Apple Programming

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: greeneelPosted on 2009-02-12 at 10:23:32ID: 23624976

You would have to introduce a line of code in case the x location of the containerObg exceeds the width of the stage.

the script would look like the following.

//this would keep it from passing the right side of the stage
 
if(containerObj.x >= stage.stageWidth)
{
containerObj.x = (stage.stageWidth - containerObj.width);
}
 
//this would keep it from passing the left side of the stage
 
if(containerObj.x <= (stage.stageWidth - stage.stageWidth))
{
containerObj.x = (stage.stageWidth - stage.stageWidth );
}

                                              
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by: workedPosted on 2009-02-12 at 16:51:18ID: 23628627

So where would I put this code exactly?  I'm not sure where I would place the if ( conditional )...

 

by: greeneelPosted on 2009-02-12 at 18:50:32ID: 23629379

here is a peace of your code with the if statements inside:

private function clickBtn(evt:MouseEvent):void {
        beginPos = containerObj.x;
        finishPosR = containerObj.x - 40;
        finishPosL = containerObj.x + 40;
        
        if (evt.target==lBtn) {
                if(finishPosL >= (stage.stageWidth - containerObj.width))
{
finishPosL = (stage.stageWidth - containerObj.width);
}
				
				var myTween1:Tween=new Tween(containerObj,"x",Strong.easeOut,beginPos,finishPosL,.5,true);
        }
		
        if (evt.target==rBtn) {
			if(finishPosR <= (stage.stageWidth - stage.stageWidth))
{
finishPosR = (stage.stageWidth - stage.stageWidth );
}
                var myTween2:Tween=new Tween(containerObj,"x",Strong.easeOut,beginPos,finishPosR,.5,true);
                }
        }
}

                                              
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