Question

when i use the following tree renderer class the the informtions in the tree gets chopped. Is there any solution to fix this bug. please help me.
The PLTree class is as follows:

import flash.events.Event;
    import mx.events.ScrollEvent;
    import mx.controls.Tree;
    import mx.core.ScrollPolicy;
    import mx.core.mx_internal;
    import mx.events.TreeEvent;

    public class PLTree extends Tree
    {
        private var _lastWidth:Number = 0;
        private var _lastHeight:Number = 0;
        public function PLTree() {
            super();
            horizontalScrollPolicy = ScrollPolicy.AUTO;
        }       
       override public function get maxHorizontalScrollPosition():Number
       {
            return mx_internal::_maxHorizontalScrollPosition;
       }     
       override public function set maxHorizontalScrollPosition(value:Number):void
       {
            mx_internal::_maxHorizontalScrollPosition = value;
            dispatchEvent(new Event("maxHorizontalScrollPositionChanged"));      
            scrollAreaChanged = true;
            invalidateDisplayList();
       }      
       override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
       {
            var diffWidth:Number = measureWidthOfItems(0,0) - (unscaledWidth - viewMetrics.left - viewMetrics.right);

            if (diffWidth <= 0) {
                maxHorizontalScrollPosition = 0;
                horizontalScrollPolicy = ScrollPolicy.OFF;
            } else {
                maxHorizontalScrollPosition = diffWidth;
                horizontalScrollPolicy = ScrollPolicy.ON;
            }
            super.updateDisplayList(unscaledWidth, unscaledHeight);
       }
    override protected function scrollHandler(event:Event):void
    {
        if (mx_internal::isOpening)
            return;

        // TextField.scroll bubbles so you might see it here
        if (event is ScrollEvent){

            super.scrollHandler(event);
            invalidateDisplayList();
        }
    }   
}

i am attaching the image file of how it looks when executed.

When surfing using google i found a suggesion to fix this bug is it the right way ?
(

Issue: Text getting chopped of at end.
Fix: change
maxHorizontalScrollPosition = diffWidth;
to
maxHorizontalScrollPosition = diffWidth + 10;
or what ever correction factor you need. 

)

Kindly help me .Thanks a lot in advance.

Answer 1

similar to the scroll handler in the above mentioned program. Use a mouse wheel scroll handler to handle that event as follows:

override protected function mouseWheelHandler(eventMouse:MouseEvent):void
     {      if (mx_internal::isOpening)
            return;

        if (eventMouse is MouseEvent){          
            super.mouseWheelHandler(eventMouse);
            invalidateDisplayList();
        }
     }