Question

我想使用Java Swing进行布局，如下图所示。

layout sketch http://tobias.braun-abstatt.de/files/forums/buttons_sketch.png

左边是一个JPanel，它以paintComponent()的方式绘制，图形在调整窗口大小时自动缩放。（问题不在于那个小组。那个已经完成了。）

现在我需要一些按钮（黑盒子，在Photoshop中为绘图添加）到前面提到的JPanel的右边。顶部和底部的红色区域的高度，旁边应该只有空的空间，沿着CONSTANT_FACTOR * getHeight()的线计算。在左边的每个隔间旁边，应该有一组按钮，排列在相应隔间的中心（见蓝线）。

包含按钮的JPanel知道CONSTANT_FACTOR和隔离专区的数量，因此应该可以将此信息提供给布局管理器。

我最好使用哪种布局管理器来实现此布局？我已经阅读了所有不同的布局管理器，但在这种情况下，我无法确定哪一个或哪个组合最适合。

Answer 1

例如，通过使用不同的LayoutManager，一个非常简单和简单的容器，不超过15-20分钟：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;

public class ThinLineFrame {
    private JFrame frame = new JFrame();
    private JScrollPane scrollPane;
    private JPanel panel = new JPanel();
    private JPanel panelNorth = new JPanel();
    private JPanel panelCenter = new JPanel();
    private JPanel panelCenterCh1 = new JPanel();
    private JPanel panelCenterCh2 = new JPanel();
    private JPanel panelCenterCh3 = new JPanel();
    private JPanel panelCenterCh4 = new JPanel();
    private JPanel panelCenterCh5 = new JPanel();
    private JPanel panelSouth = new JPanel();

    public ThinLineFrame() {
        panelNorth.setBackground(Color.red.darker());
        panelNorth.setPreferredSize(new Dimension(80, 30));
        //
        panelCenter.setBackground(Color.darkGray);
        panelCenter.setLayout(new GridLayout(5, 1, 2, 2));
        //
        panelCenterCh1.setLayout(new BorderLayout());
        JButton panelCenterCh1Button = new JButton();
        panelCenterCh1.add(panelCenterCh1Button, BorderLayout.CENTER);
        //
        JButton panelCenterCh2Button1 = new JButton();
        JButton panelCenterCh2Button2 = new JButton();
        panelCenterCh2.setLayout(new GridLayout(2, 1, 2, 2));
        panelCenterCh2.add(panelCenterCh2Button1);
        panelCenterCh2.add(panelCenterCh2Button2);
        //
        JButton panelCenterCh3Button1 = new JButton();
        JButton panelCenterCh3Button2 = new JButton();
        panelCenterCh3.setLayout(new GridLayout(2, 1, 2, 2));
        panelCenterCh3.add(panelCenterCh3Button1);
        panelCenterCh3.add(panelCenterCh3Button2);
        //
        JButton panelCenterCh4Button1 = new JButton();
        JButton panelCenterCh4Button2 = new JButton();
        panelCenterCh4.setLayout(new GridLayout(2, 1, 2, 2));
        panelCenterCh4.add(panelCenterCh4Button1);
        panelCenterCh4.add(panelCenterCh4Button2);
        //
        panelCenterCh5.setLayout(new BorderLayout());
        JButton panelCenterCh5Button = new JButton();
        panelCenterCh5.add(panelCenterCh5Button, BorderLayout.CENTER);
        //
        panelCenter.add(panelCenterCh1);
        panelCenter.add(panelCenterCh2);
        panelCenter.add(panelCenterCh3);
        panelCenter.add(panelCenterCh4);
        panelCenter.add(panelCenterCh5);
        //
        panelSouth.setBackground(Color.red.darker());
        panelSouth.setPreferredSize(new Dimension(80, 30));
        //
        panel.setLayout(new BorderLayout(2, 2));
        panel.add(panelNorth, BorderLayout.NORTH);
        panel.add(panelCenter, BorderLayout.CENTER);
        panel.add(panelSouth, BorderLayout.SOUTH);
        //
        scrollPane = new JScrollPane(panel);
        frame.add(scrollPane, BorderLayout.CENTER);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setPreferredSize(new Dimension(80, 600));
        frame.setLocation(100, 150);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String args[]) {
        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                ThinLineFrame dlg = new ThinLineFrame();
            }
        });
    }
}

Answer 2

您应该尝试查看MigLayout。它是一个非常灵活的LayoutManager，也非常简单。

代码看起来像：

MigLayout layout = new MigLayout("flowy");
panel.setLayoutManager(layout);
panel.add(button1);
panel.adD(button2);
etc..

尝试将debug flowy添加到构造函数中，以便直观地了解正在发生的事情。

Answer 3

GBC没有锚点，只有普通的GridBagConstraints和首选大小。

固定大小的中心JButton：

import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

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

public class MainWithFixSize {
    public static void main(String[] argv) throws Exception {
        JFrame frame = new JFrame();
        Container container = frame.getContentPane();
        GridBagLayout gbl = new GridBagLayout();
        container.setLayout(gbl);
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 1;
        gbc.gridy = 1;
        JButton component = new JButton();
        component.setPreferredSize(new Dimension(25, 25));
        gbl.setConstraints(component, gbc);
        container.add(component);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setPreferredSize(new Dimension(40, 90));
        frame.pack();
        frame.setVisible(true);
    }

    private MainWithFixSize() {
    }
}

可调整大小的Swing布局，按钮按可变尺寸排列

3 个答案: