I'm having some brain ache with trying to find an easy solution to this
one, and I'm wondering If I'm missing the obvious (again )?
I'm trying to replace the hardcoded "var scrollBarWidth:int = 16;" line
in the code below with one that actually reflects the true width of the
scrollbar (say if it's been styled or skinned).
I can see the scrollbar in the comboBoxes dropdown instance in the
debugger ("scroll_verticalScrollbar"), however it is private. Is there
an easier/better way to find it's width than extending the dropdown
renderer to provide access to it?
Perhaps via styles/skin properties? Or another approach entirely ?
Apologies if this is a really stupid question, and thanks in advance for
any pointers.
Jim.
package com.ifeedme.component
{
import flash.events.Event;
import mx.controls.ComboBox;
import mx.events.FlexEvent;
/**
*
* @author jim Hayes
* ExtendedComboBox : extends comboBox to provide a dropdownWidth
that adjusts to the widest label
* whenever the dataprovider is changed.
*/
public class ExtendedComboBox extends ComboBox
{
public function ExtendedComboBox()
{
super();
}
public function adjustDropDownWidth(event:Event=null):void
{
if (this.dropdown == null)
{
callLater(adjustDropDownWidth)
}
else
{
var ddWidth:int =
this.dropdown.measureWidthOfItems(-1,this.dataProvider.length);
if (this.dropdown.maxVerticalScrollPosition > 0)
{
// we have vertical scrollbar
var scrollBarWidth:int = 16;
ddWidth += 16;
}
this.dropdownWidth =
Math.max(ddWidth,this.width);
}
}
override protected function
collectionChangeHandler(event:Event):void
{
super.collectionChangeHandler(event);
this.addEventListener(FlexEvent.VALUE_COMMIT,adjustDropDownWidth)
}
}
}
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