java 设置 JScrollPane 的恒定大小
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Set constant size of JScrollPane
提问by Joel Christophel
I have a JTabbedPane with a Border Layout.
我有一个带有边框布局的 JTabbedPane。
Here's the code I'm using to add the components:
这是我用来添加组件的代码：
add(columnNames, BorderLayout.NORTH);
add(scroll, BorderLayout.CENTER);
add(useCtrl, BorderLayout.SOUTH);
setVisible(true);
Question: Notice the excess whitespace to the right inside the JScrollPane. I don't want that there. I would like for the JScrollPane not to change size at all when changing the size of the JFrame. I have tried setSize() and setPreferredSize(), but the size of the JScrollPane always changes. I've tried using GridLayout, but I get the same result.
问题：注意 JScrollPane 右侧的多余空白。我不想在那里。我希望 JScrollPane 在更改 JFrame 的大小时根本不更改大小。我尝试过 setSize() 和 setPreferredSize()，但 JScrollPane 的大小总是在变化。我试过使用 GridLayout，但我得到了相同的结果。
回答by StanislavL
Place the JScrollPanein a JPanelwith another layout. (e.g. BoxLayoutor GridBagLayout). And add the JPanelto the center.
将与另一个布局JScrollPane放在JPanel一起。（例如BoxLayout或GridBagLayout）。并添加JPanel到中心。
回答by Mel Nicholson
The size of a graphics object is controlled by the layout manager. The BorderLayoutwill always expand the CENTERobject to take up all available space. GridLayoutexpands all it's children proportionally. If you try a GridBagLayout and set the weightxto 0, that will prevent expansion horizontally.
图形对象的大小由布局管理器控制。该BorderLayout会一直扩大CENTER对象占用全部可用空间。 GridLayout按比例扩展它的所有子项。如果您尝试使用 GridBagLayout 并将 设置weightx为 0，则将阻止水平扩展。
There are a lot of layout managers available, browse the API for more choices and experiment until you find the resizing behavior you want. Each has a fairly good explanation of how it works in the javadoc.
有很多可用的布局管理器，浏览 API 以获得更多选择并进行试验，直到找到所需的调整大小行为。每个人都对它在 javadoc 中的工作方式有很好的解释。
