在Flex 4中，如果节点展开，如何动态更改Tree rowCount？
树的最小行数应为 4，最大行数为 10（超过该行数应显示滚动条）。因此，我有一棵 rowCount="4" 的树，我希望 rowCount 根据当前扩展的节点更改为“10”。在调试中，我可以看到我可以使用的两个树属性： - 集合长度 - numberOfRows
但这些无法从外部访问，因此我无法找到一种方法来了解树是否已展开。
我该怎么做？
我是否必须创建一个继承自 Tree 的自定义 MyTree？我试图避免这种情况...
谢谢， 努诺
The tree should have a minimum row count of 4 and a maximum of 10 (beyond which it should display the scroll bars). So, I have a tree with rowCount="4" and I want rowCount to change up to "10" depending on the currently expanded nodes. In debug I can see two of the tree's properties which I could use:
- collectionLength
- numberOfRows
But these are not accessible from outside so I can't find a way to understand if the tree is expanded or not.
How can I do this?
Will I have to create a custom MyTree which inherits from Tree? I was trying to avoid this...
Thanks,
Nuno
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不确定您是否已经弄清楚了这一点，但这应该是您确定打开的内容所需的全部http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/controls/Tree .html?filter_flex=4.1&filter_flashplayer=10.1&filter_air=2#openItems
Not sure if you already got this figured out but this should be all you need to determine what's open http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/controls/Tree.html?filter_flex=4.1&filter_flashplayer=10.1&filter_air=2#openItems