Question

当我使用下面的树渲染器类时，树中的信息被切断。有没有解决方案来修复这个bug。请帮我。 PLTree类如下：

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();
        }
    }   
}

我正在附加执行时的外观图像文件。 enter image description here

使用谷歌浏览我发现修复此错误的建议是正确的方法吗？（

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

）

请帮帮我。谢谢你。

Answer 1

查看您的图片，我怀疑该问题与特定树无关，并且只与渲染器有点关联。相反，我认为当创建持有Tree的容器时，它没有大小，并且当Tree调整其渲染器大小时，它会给它们错误的大小。由于基于列表的控件不在渲染器上设置实际宽度，因此选择设置explicitWidth，不会触发渲染器更改其大小。

查看http://www.developria.com/2009/12/handling-delayed-instantiation-1.html以获取更多详细信息和修正。

Answer 2

类似于上述程序中的滚动处理程序。使用鼠标滚轮滚动处理程序来处理该事件，如下所示：

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

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

即使在使用滚动条后，flex tree也会被切断

2 个答案: