Java 设置 JPanel 的大小
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/4222025/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
setting the size of a JPanel
提问by aherlambang
I have a class that extends a JPanelcalled Row. I have a bunch of Row added to a JLabel, the code is the following:
我有一个扩展名为 Row的JPanel的类。我有一堆 Row 添加到JLabel，代码如下：
JFrame f=new JFrame();
JPanel rowPanel = new JPanel();
//southReviewPanel.setPreferredSize(new Dimension(400,130));
rowPanel.setLayout(new BoxLayout(rowPanel, BoxLayout.Y_AXIS));
rowPanel.add(test1);
rowPanel.add(test1);
rowPanel.add(test2);
rowPanel.add(test3);
rowPanel.add(test4);
rowPanel.setPreferredSize(new Dimension(600, 400));
rowPanel.setMaximumSize(rowPanel.getPreferredSize());
rowPanel.setMinimumSize(rowPanel.getPreferredSize());
f.setSize(new Dimension(300,600));
JScrollPane sp = new JScrollPane(rowPanel);
sp.setSize(new Dimension(300,600));
f.add(sp);
f.setVisible(true);
where test1...etc is a Row. However when I resize the window the layout of the Row somehow becomes messy (it resizes as well)... how can I prevent this from happening?
其中 test1...etc 是一行。但是，当我调整窗口大小时，Row 的布局会以某种方式变得混乱（它也会调整大小）……我该如何防止这种情况发生？
采纳答案by camickr
Read the Swing tutorial on Using Layout Managers. Each layout manager has its own rules about what happens when the container is resized. Experiment and play.
阅读有关使用布局管理器的 Swing 教程。每个布局管理器都有自己的规则，当容器被调整大小时会发生什么。实验和玩耍。
In the case of a BoxLayout it should respect the maximum size of the components added to the panel so you can do:
在 BoxLayout 的情况下，它应该尊重添加到面板的组件的最大尺寸，以便您可以：
childPanel.setMaximumSize( childPanel.getPreferredSize() );
If you need more help post your SSCCEdemonstrating the problem.
如果您需要更多帮助，请发布您的SSCCE 来演示问题。
回答by Cesar
I took the code in http://download.oracle.com/javase/tutorial/uiswing/examples/layout/BoxLayoutDemoProject/src/layout/BoxLayoutDemo.javaand adapted it with what you are trying to do, only using buttons instead of custom JPanels:
我在http://download.oracle.com/javase/tutorial/uiswing/examples/layout/BoxLayoutDemoProject/src/layout/BoxLayoutDemo.java中获取了代码，并根据您要执行的操作对其进行了调整，仅使用按钮而不是自定义 JPanel：
public class BoxLayoutDemo {
public static void addComponentsToPane(Container pane) {
JPanel rowPanel = new JPanel();
pane.add(rowPanel);
rowPanel.setLayout(new BoxLayout(rowPanel, BoxLayout.Y_AXIS));
rowPanel.add(addAButton("Button 1"));
rowPanel.add(addAButton("Button 2"));
rowPanel.add(addAButton("Button 3"));
rowPanel.add(addAButton("Button 4"));
rowPanel.add(addAButton("5"));
rowPanel.setPreferredSize(new Dimension(600, 400));
rowPanel.setMaximumSize(rowPanel.getPreferredSize());
rowPanel.setMinimumSize(rowPanel.getPreferredSize());
}
private static JButton addAButton(String text) {
JButton button = new JButton(text);
button.setAlignmentX(Component.CENTER_ALIGNMENT);
return button;
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("BoxLayoutDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Set up the content pane.
addComponentsToPane(frame.getContentPane());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
The end result is this:
最终结果是这样的：
As you can see, the button row is perfectly aligned. If you resize the JFrame, they stay aligned. Is that what you are looking for?
如您所见，按钮行完全对齐。如果您调整 JFrame 的大小，它们将保持对齐。这就是你要找的吗？
