检测是否UIComponent具有滚动条活跃 [英] Detecting if UIComponent has scroll bars active

问题描述

我在Flex中TileList和需要能够检测如果滚动条显示与否，这样我就可以改变它奠定了项目的大小。

I have a TileList in flex, and need to be able to detect if the scroll bars are shown or not, so I can change the size of the items it is laying out.

ScrollPolicy设置为auto，但我需要一个像CurrentScrollPolicy一个变量，它会从截止到更改​​取决于内容。

ScrollPolicy is set to auto, but I need a variable like CurrentScrollPolicy which will change from off to on depending on the content.

感谢

推荐答案

感谢eBuildy，你的权利！

Thanks eBuildy, your right!

我已经创建了一个例子，也考虑到滚动条让隐藏在不需要的时候，而不是重新设置为空的事实：

I have created an example that also takes into account the fact that scroll bars get hidden when not needed rather than set back to null:

   public class CustomTileList extends TileList
{

    public function CustomTileList()
    {
        super();
    }

    /**
     * Returns true if the vertical scroll bar is displayed
     * @return Boolean
     *
     */
    public function hasVerticalScrollBar():Boolean
    {
        if (super.verticalScrollBar == null || super.verticalScrollBar.visible == false)
            return false;
        return true;
    }

}

感谢您的帮助。

Thanks for the help.

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