[Laszlo-dev] how to convert applyConstraint to applyConstraintMethod in lps-4.1.x

[P T Withington]

In preparation for swf9, we need constraint closures to be methods (so  
they will get proper references to `this`).  The conversion you need  
to make is to take the closure:

   function() { this.setAttribute("x", this.parent.width -  
this.width); }

and make it a method on the class:

   <method name="constrain_x">this.setAttribute("x", this.parent.width  
- this.width);</method>

and apply it by:

   this.applyConstraintMethod('constrain_x', [p, "width", this,  
"width"])

Better yet, if the constraint can be written in LZX, as in the comment:

                    // _vs.x="${parent.width - this.width}"

you would not need to do any of this.  I don't know enough about the  
rich-text component to say why it was done this way.

On 2008-08-06, at 14:00EDT, Sebastian Wagner wrote:

> hi,
> I try to use the Rich-Text Editor in lps-4.1.1
>
> Besides others you get Messages like that:
> INFO @lz/vscrollbar.lzx#9: vscrollbar.applyConstraint is  
> deprecated.  Use
> vscrollbar.applyConstraintMethod instead
>
> see:
> http://www.openlaszlo.org/lps4.1/lps/components/incubator/rich-text/test/richtexteditor-test.lzx?lzr=swf8&debug=true
>
> I was able to fix all the other Errors but  
> *vscrollbar.applyConstraint is
> deprecated* confuses me cause actually applyConstraint is still a  
> valid
> method in the Documenation and applyConstraintMethod has different  
> arguments
> then applyConstraint, so how can we convert that?
>
> The result of the Error is that the scollbar does not work in the  
> Rich-Text
> Editor.
>
> The Error comes from this part:
>
> var vsinit = function () {
>                    var p = this.parent;
>
>
>                    // _vs.x="${parent.width - this.width}"
>                    this.applyConstraint("x",
>                        function() { this.setAttribute("x",
> this.parent.width - this.width); },
>
>                        [p, "width", this, "width"]);
>
> .....
>
> in the File:
> http://www.openlaszlo.org/lps4.1/lps/components/incubator/rich-text/scrollrichedittext.lzx?lzt=source
>
> how to convert applyConstraint to applyConstraintMethod or did the  
> compile
> actually mean something different?
>
>
> thx
> sebastian
>
> -- 
> Sebastian Wagner
> http://www.webbase-design.de
> http://openmeetings.googlecode.com
> http://www.laszlo-forum.de
> seba.wagner at gmail.com