内部组件的JPanel大小

问题描述

是否可以告诉JPanel将其大小设置为适合它包含的所有组件？像JFrame的 pack（）之类的东西。

Is it possible to tell JPanel to set its size to fit all components that it contains? Something like pack() for JFrame.

编辑：使用preferredSize的技巧没有帮助。我有JSplitPane，其中一部分是带有许多标签的GridBagLayout（见截图）和标签相互重叠。

edit: The trick with preferredSize didn't help. I've got JSplitPane, where in one part there is GridBagLayout with many labels (see screenshot) and labels overlap each other.

推荐答案

在查看 pack（）的源代码后，我想出了：

After looking at the source code for pack(), I came up with:

    panel.setPreferredSize(panel.getPreferredSize());

这会强制面板根据其子组件的首选大小重新计算其首选大小。

This forces the panel to recalculate its preferred size based on the preferred sizes of its subcomponenents.

您可能需要或不必致电;在我的小例子中，它似乎没有区别，但Javadoc说：

You may or may not have to call validate() afterward; in my tiny example, it seemed to make no difference, but the Javadoc says:

所以我想这取决于你为什么要重新包装你的 JPanel 。

So I guess it depends on why you're having to repack your JPanel.

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