[Laszlo-dev] overriding a 'always' constraint

[Henry Minsky]

I was looking into a remaining bug in the amazon / DHTML demo and I came
across a case where it appears that
a "always" constraint is running in a different order than it does in the
swf runtime. The symptom is that a view
had it's height constrained as shown below



    <class name="tabpanel" clip="true" x="1" width="${parent.width-2}"
           bgcolor="#FFFFFF" height="${top.height}"
defaultplacement="content">
                                      ^^^^^

And then in some other code there was an oninit method which was trying to
set the height manually, calling this method

        <method name="open">
            this.animate("height",parent.height-(parent.subviews.length-1)*
top.height-1,333,false);
        </method>



In swf, the call to animate the height succeeded, but in DHTML, it appears
that the constraint won out and kept the height
at some smaller setting.

I fixed this by changing the constraint to a $once

    <class name="tabpanel" clip="true" x="1" width="${parent.width-2}"
           bgcolor="#FFFFFF" height="${once{top.height}"
defaultplacement="content">

However I am wondering what the semantics are supposed to be if you try to
animate an attribute which is constrained to something else.





-- 
Henry Minsky
Software Architect
hminsky at laszlosystems.com
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