为什么doLayout()没有用呢？

Question

我想动态再我的布局中添加一些组件，但是无法显示出来，后来在网上查了一下是要调用一下doLayout(),但是还是没有用。
[b]问题补充：[/b]
对我的布局就是border布局，我想动态添加west

Answer 1

Notes:

* Any container using the BorderLayout must have a child item with region:'center'. The child item in the center region will always be resized to fill the remaining space not used by the other regions in the layout.
* Any child items with a region of west or east must have width defined (an integer representing the number of pixels that the region should take up).
* Any child items with a region of north or south must have height defined.
* The regions of a BorderLayout are fixed at render time and thereafter, its child Components may not be removed or added. To add/remove Components within a BorderLayout, have them wrapped by an additional Container which is directly managed by the BorderLayout. If the region is to be collapsible, the Container used directly by the BorderLayout manager should be a Panel. In the following example a Container (an Ext.Panel) is added to the west region: 

这个是原文,大意就是border布局不能够动态增加和删除子组件,建议你先把你不想看到的部分折叠起来.这样比较好