[Laszlo-user] Question about applyConstraintMethod()

[André Bargull]

I've already converted all "applyConstraint" to "applyConstraintMethod" 
for the queens-charts (at least in trunk).

> So, I'm working on bringing all the charting stuff up to speed so that 
> we can finally get that checked in appropriately, and I have a bunch of 
> instances of applyConstraint() that need to be changed.  So what I did 
> was, I took the functions and made methods out of them, but I'm not sure 
> exactly what to feed into applyConstraintMethod() to get it to work the 
> same way.  For instance, part of my code block looks like:
>
>           if(this.charttype == "bar"){
>               if(this.drawaxis == 'x'){
>                   var f = function(ignore=null){                         
> this.setAttribute("x", this.barlink.x + (this.barlink.width / 2) -
>                           (this.width / 2));                         }
>                   var d = [this.barlink, "x"];
>                   this.applyConstraint("x", f, d);
>                   var ff = function(ignore=null){
>                       this.setAttribute("y", this.barlink.y - 
> this.height - 4);
>                   }
>                   var dd = [this.barlink, "y"];
>                   this.applyConstraint("y", ff, dd);
>                   if(this.fadein == true){
>                       this.fader.doStart();
>                   }
>               }
>
> So what I did was, I made methods for these:
>
>       <method name="constrainBarDrawXX" args="ignore=null">
>           this.setAttribute('x', this.barlink.x + (this.barlink.width / 
> 2) - (this.width / 2));
>       </method>
>       <method name="constrainBarDrawXY" args="ignore=null">
>           this.setAttribute('y', this.barlink.y - this.height - 4);
>       </method>
>
> ...and changed the script to:
>
> if(this.charttype == "bar"){
>               if(this.drawaxis == 'x'){
>                   this.applyConstraintMethod("constrainBarDrawXX", 
> [this.barlink, x, this, x]);
>                   this.applyConstraintMethod("constrainBarDrawXY", 
> [this.barlink, y, this, y]);
>                   if(this.fadein == true){
>                       this.fader.doStart();
>                   }
>
> However, the labels now don't exhibit the same behavior as when they 
> were using applyConstraint().  What am I doing wrong?
>
> Thanks!
> Josh
>