GWT docklayoutpanel widget visibility
How to know that a widget is hidden once you have call the
dock.setWidgetHidden(widget, true);
as it seems we do not have access to Layoutdata I do not know how to do this.
使用继承，您可以扩展DockLayoutPanel类并将访问器写入LayoutData，或者只写一个布尔方法来告知widget x是否隐藏。
I think you can find something like this:
String visibility = myDockLayoutPanel.getWidgetContainerElement(childPanel).getStyle().getVisibility()
The visibility might be "visible | hidden | collapse | inherit"
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