[Laszlo-dev] Setting constraints on a newed object

[P T Withington]

Well, a constraint boils down to a method that sets the constrained  
attribute and a set of events that listen to the dependencies of the  
constraint.  The compiler has a simple analyzer to find the  
dependencies in a constraint expression.  You'd have to do this  
analysis manually for a constraint created at runtime.  Your simple  
case could be done as:

  obj.constrainWidth = function () {
     this.setAttribute('width', parent.width);
  }
  new LzDelegate(obj, 'constrainWidth', obj.parent, 'onwidth');

If there were multiple dependencies, you'd create a delegate for your  
constraintMethod and register it on each of the dependencies.

On 19 Jul 2005, at 12:52, Andrew McClain wrote:

> What's the best way to set up constraints on a javascript-created  
> object?
>
> e.g.   convert <LZClass height="40" width="${parent.width}" /> into  
> javascript
>
>  var obj = new LZClass(this, {height: 40});
>
> ... then what?
>
>
> andrew
>
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