[Laszlo-dev] trouble at runtime with 'apply'

[P T Withington]

Maybe it is just time to bite the bullet and not support apply as both  
a method and an attribute in state any more?

I think you can work around this by changing:

   if (! (a in this))

to:

   if (! this[a])

[Remember that `in` does not see "class fixtures", which the apply  
method is.]

But, we really ought to make an API change.  I would propose that the  
state 'state variable' be named `applied`, not `apply`.  That would be  
consistent with the visibility/visible change we made for view.

On 2008-04-21, at 14:41 EDT, Henry Minsky wrote:

> I'm trying to get the slider component to work in swf9, and I have  
> gotten to
> the point where I am
> getting this runtime error
>
> [Fault] exception, information=ReferenceError: Error #1037: Cannot  
> assign to
> a method apply on .$lzc$class_state_$lz$2Fslider$2Elzx_9_52.
> Fault, __LZapplyArgs() at LzNode.as:273
> 273   this[a] = null
> (fdb) p a
> $1 = "apply"
> (fdb)
>
>
> I think this may be due to this line in the slider.lzx component
>
>        <state apply="${this.classroot.showrange}">
>            <text y="${classroot.track.y + classroot.track.height + 2}"
>                text="${classroot.minvalue}" fgcolor="$ 
> {classroot.style ?
> classroot.style.textcolor : this.fgcolor}"
>            />
>            <text y="${this.classroot.track.y +  
> this.classroot.track.height
> + 2}" resize="true"
>                x="${classroot.track.x+classroot.track.width-width}"
>                text="${classroot.maxvalue}" fgcolor="$ 
> {classroot.style ?
> classroot.style.textcolor : this.fgcolor}"
>            />
>        </state>
>
> The code in applyArgs is this line I think
>
>            // NOTE: [2007-05-16 ptw] This check ensures that each
>            // constrained attribute exists in the new instance.
>            // Necessary because of 'implicit this', which will make a
>            // free reference (error in Javascript) otherwise.  We
>            // have to not shadow inherited values because in some
>            // cases (e.g., lz.state), we actually have a method and
>            // an attribute of the same name!  The attribute is
>            // implemented by a setter, so it never clobbers the
>            // method... er, unless you set the attribute to a
>            // function.  YOW!
>            if (! (a in this)) {this[a] = null;}
>
>
> Is this something we can avoid in swf9?
> -- 
> Henry Minsky
> Software Architect
> hminsky at laszlosystems.com