Constraints are allowed to be arbitrary expressions, so you could write:
width="parent.width > 0 ? parent.width - 20 : 0"
Or you could create a subclass of view that enforces minimums:
<class name="minview" extends="view">
<attribute name="minwidth" value="0" />
<method name="setWidth" args="newwidth">
super.setWidth(newwidth < minwidth ? minwidth : newwidth);
</method>
</class>
Of course, you might also hope that the basic view would not let you
set your width to a negative number...
On 2006-09-23, at 01:25 EDT, [EMAIL PROTECTED] wrote:
> In my example below, I create a view with a smaller nested view. The
> inner view gets its size from constraints based on the its parent.
> The problem is, when the parent is resized too small, the constraints
> on the inner view become negative. If you run my app, you can adjust
> the size with the slider and see what happens. Basically, I need some
> way to have a constraint that tracks the parent, but cannot become
> negative. Is there some way to do this in a contstraint? Or possibly
> a different solution that doesn't have the negative constraint
> problem?
>
>
> <canvas>
>
> <view x="20" y="20" layout="axis:y">
> <view layout="axis:x">
> <text text="outer view size: "/>
> <slider id="sizeslider" width="100" showvalue="true"
> value="50"/>
> </view>
> <view layout="axis:x">
> <text text="inner view size: "/>
> <text text="${box.subviews[0].height}" bgcolor="silver"/>
> </view>
> </view>
>
> <view id="box" x="20" y="80" bgcolor="blue"
> width="${sizeslider.value}" height="${sizeslider.value}">
> <view bgcolor="green" x="10" y="10"
> width="${parent.width - 20}" height="${parent.height -
> 20}"/>
> </view>
>
>
> </canvas>
>
>
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