topic Constraint-based positioning of components using ActionScript 3.0 in Application Development and Automation Discussions

Constraint-based positioning of components using ActionScript 3.0

GrahamRobbo — Sun, 16 Nov 2008 23:28:58 GMT

Hi there,

I am building a Flex3 and ActionScript application. I need to build much of the UI dynamically so I am using ActionScript for this.

My problem is that I can't figure out how use constraint-based positioning for my components.

Take for example this MXML that instantiates a TitleWindow.

<mx:TitleWindow layout="absolute" id="myid" title="My Window" left="10" right="10" top="10" bottom="10">
</mx:TitleWindow>

I can do the same thing in ActionScript...

var myTitleWindow:TitleWindow = new TitleWindow;
myTitleWindow.id = "myid";
myTitleWindow.layout = "absolute";
myTitleWindow.title="My Window";
this.addChild(myTitleWindow);

...but I cannot figure out how to set the left, right, top bottom attributes. I have looked at the generated ActionScript from the MXML example and it uses the stylesFactory property of the mx.core.UIComponentDescriptor class but I can't figure out how to replicate this in my code.

As always I would appreciate anyones help with this.

Cheers

Graham Robbo

Re: Constraint-based positioning of components using ActionScript 3.0

RichHeilman — Sun, 16 Nov 2008 23:55:16 GMT

Hey Graham. Check this out.

var aComponent:yourComponent = new yourComponent();
var theStyle:CSSStyleDeclaration = new CSSStyleDeclaration();
theStyle.setStyle(u201Dtopu201D, 0);
theStyle.setStyle(u201Dbottomu201D, 0);
theStyle.setStyle(u201Dleftu201D, 0);
theStyle.setStyle(u201Drightu201D, 0);
theStyle.setStyle(u201DhorizontalCenteru201D, 0); 
aComponent.styleDeclaration = theStyle;

Regards,

Rich Heilman

Re: Constraint-based positioning of components using ActionScript 3.0

GrahamRobbo — Mon, 17 Nov 2008 00:08:01 GMT

Thanks Rich - your response time is not bad either.

Cheers

Graham Robbo