Java Swing BorderLayout调整大小的困难 [英] Java Swing BorderLayout resize difficulties

问题描述

我想将屏幕分成两部分，所以我使用了一个带有东西两部分的BorderLayout.我在调整大小时遇到​​问题，并且在此处我最终发现宽度未更改东部和西部面板以及高度在北部和南部面板中均未更改，并且在中央面板中均已更改.

I want to have my screen split in two so I used a BorderLayout with East and West sections. I had problems resizing and here I eventually found out that width is not changed in the East and West panels and height is not changed in the North and South panels and both are changed in the Center panel.

但是，我希望宽度和高度都可以在调整大小时更改，并排有两个面板.我尝试了各种级别的嵌套以尝试使其正常工作，但我认为它不能与BorderLayout一起使用.

However, I want both width and height to be changed upon resize, and have two panels side by side. I have tried various levels of nesting to try getting it to work but I do not think it will work with BorderLayout.

对于默认的布局管理器来说，这似乎应该很容易，但是也许我应该尝试使用其他布局(例如BoxLayout)来实现我想要的功能.

It seems like this should be easy for the default layout manager but maybe I should try a different layout (e.g. BoxLayout) to achieve what I want.

这里还有一些代码可以复制我正在谈论的问题(尝试调整窗口大小):

Also here is some code which replicates the problem I am talking about (try resizing the window):

import java.awt.BorderLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JFrame {

    public static void main(String[] args) {
        JFrame window = new Main();
        window.setVisible(true);
    }

    public Main() {
        JButton east = new JButton("East");
        JButton west = new JButton("West");

        JPanel content = new JPanel();
        content.setLayout(new BorderLayout());

        content.add(east, BorderLayout.EAST);
        content.add(west, BorderLayout.WEST);

        setContentPane(content);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
    }

}

我不希望双方相等，大约是2:1是我想要的比率.

I do not want the two sides to be equal, roughly 2:1 is the ratio which I want.

推荐答案

在您的情况下可以使用的是

What you can use in your case is GridLayout, here two JButtons will resize themselves as the JFrame resizes.

import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class Main extends JFrame {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                JFrame window = new Main();
                window.setVisible(true);
            }
        });        
    }

    public Main() {
        JButton east = new JButton("East");
        JButton west = new JButton("West");

        JPanel content = new JPanel();
        content.setLayout(new GridLayout(1, 2));

        content.add(east);
        content.add(west);

        setContentPane(content);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
    }

}

此外，始终最好从EDT-事件调度线程而不是从主线程运行与GUI相关的代码.请阅读 Swing中的并发，以获取有关该主题的更多信息.

Moreover, it's always best to run your GUI related code from the EDT - Event Dispatch Thread, and not from the Main Thread. Do read Concurrency in Swing, for more info on the topic.

最新根据要求的评论

使用GridBagLayout指定要提供的大小

Use GridBagLayout to specify the size that you want to give

import java.awt.Color;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class Main extends JFrame {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                JFrame window = new Main();
                window.setVisible(true);
            }
        });        
    }

    public Main() {
        JPanel east = new JPanel();
        east.setOpaque(true);
        east.setBackground(Color.WHITE);
        JPanel west = new JPanel();
        west.setOpaque(true);
        west.setBackground(Color.BLUE);

        JPanel content = new JPanel();
        content.setLayout(new GridBagLayout());

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.anchor = GridBagConstraints.FIRST_LINE_START;
        gbc.fill = GridBagConstraints.BOTH;
        gbc.weightx = 0.3;
        gbc.weighty = 1.0;
        gbc.gridx = 0;
        gbc.gridy = 0;

        content.add(east, gbc);
        gbc.weightx = 0.7;
        gbc.gridx = 1;
        content.add(west, gbc);

        setContentPane(content);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
    }

}

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