just for the record, i figured it out after reading 'creating advanced
components', as manish mentioned originally the measure method has to
be overridden, so that the _measuredPreferredWidth and
_measuredPreferredHeight are set according to your layout wishes.
i include my modified code....
ed
// Flow.as
/**
* Implements flow layout for Flex.
* from original source by Manish Jethani of Macromedia
*/
class Flow extends mx.containers.Container
{
/* measure
* note: height has to be specified in pixels at the moment
*
* measure is like a dry run at laying out the children and setting
_measured variables
* once these are set, then the component will draw properly.
*/
private function measure( Void ): Void
{
var vm:Object = getViewMetricsAndMargins();
var lastX:Number = vm.left;
var lastY:Number = vm.top;
var columnWidth:Number = 0;
for (var i:Number = 0; i < numChildren; i++)
{
var child:Object = getChildAt(i);
if (lastY + child.preferredHeight > layoutHeight -
vm.bottom)
{
lastX += columnWidth +
getStyle("horizontalGap") ;
}
lastY += child.preferredHeight;
columnWidth = Math.max(columnWidth,
child.preferredWidth);
}
_measuredPreferredWidth = lastX;
_measuredPreferredHeight = layoutHeight;
}
private function layoutChildren():Void
{
var vm:Object = getViewMetricsAndMargins();
var lastX:Number = vm.left;
var lastY:Number = vm.top;
var columnWidth:Number = 0;
for (var i:Number = 0; i < numChildren; i++)
{
var child:Object = getChildAt(i);
if (lastY + child.preferredHeight > layoutHeight -
vm.bottom)
{
lastX += columnWidth +
getStyle("horizontalGap") ;
lastY = vm.top;
}
child.move(lastX, lastY);
lastY += child.preferredHeight;
columnWidth = Math.max(columnWidth,
child.preferredWidth);
}
super.layoutChildren();
}
}
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