Java GridBagLayout 调整大小和固定大小

Question

这就是我想要实现的目标

------------------------| 150px |
|                       | width |
|                       |   p2  |
|                       |       |
|      Fill frame       |       |
|      p1               |       |
|                       |       |
|                       |       |
------------------------|       |
150px height            |       |
|       p3              |       |
---------------------------------

“填充框”必须动态缩放，但其他两个方块具有固定的宽度/高度。

我的代码确实产生了这种布局，但 p1 没有缩放以填满整个框架。 有人可以告诉我如何使 p1 动态化吗？

提前致谢。

这是我目前所拥有的：

    setTitle(Rolit.TITLE);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    mainPanel = new JPanel();
    mainPanel.setLayout(new GridBagLayout());
    GridBagConstraints c = new GridBagConstraints();

//P1    FILL P1 WITH 64 BUTTONS
    p1 = new JPanel();
    p1.setLayout(new GridLayout(8, 8));

    p1.setMinimumSize(new Dimension(600, 600));
    p1.setMaximumSize(new Dimension(600, 600));
    p1.setPreferredSize(new Dimension(600, 600));

    for(int y = 0; y < 8; y++){
        for(int x = 0; x < 8; x++){
            JButton btn = new JButton(x + " , " + y);
            p1.add(btn);
        }
    }

//P2    FILL P2 WITH 4 BUTTONS
    p2 = new JPanel();
    p2.setLayout(new GridLayout(4, 1));
    p2.setMinimumSize(new Dimension(150, 100));
    p2.setMaximumSize(new Dimension(150, 100));
    p2.setPreferredSize(new Dimension(150, 100));

    for(int i = 0; i < 4; i++){
        p2.add(new JButton("Button"));
    }

//P3
    p3 = new JPanel();
    p3.setMinimumSize(new Dimension(100, 150));
    p3.setMaximumSize(new Dimension(100, 150));
    p3.setPreferredSize(new Dimension(100, 150));
    p3.setBackground(Color.BLUE);


//ADD ALL TO mainPanel

    c.gridx = 0;
    c.gridy = 0;
    c.fill = GridBagConstraints.BOTH; 
    mainPanel.add(p1, c);        

    c.gridx = 1;
    c.gridheight = 2;  
    c.fill = GridBagConstraints.VERTICAL;
    mainPanel.add(p2, c);

    c.gridx = 0;
    c.gridy = 1;
    c.gridheight = 1;        
    c.gridwidth = 2;
    c.fill = GridBagConstraints.HORIZONTAL;
    mainPanel.add(p3, c);

    setContentPane(mainPanel);
    pack();
    setLocationRelativeTo(null);
    setVisible(true);

Answer 1

您需要为weightx 和weighty 提供GridBagConstraints 值，这会影响各个组件对父容器大小变化的反应以及在给定单元格中占用多少“重量”

查看How to use GridBagLayout了解更多详情

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestGridBagLayout {

    public static void main(String[] args) {
        new TestGridBagLayout();
    }

    private JPanel mainPanel;
    private JPanel p1;
    private JPanel p2;
    private JPanel p3;

    public TestGridBagLayout() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                mainPanel = new JPanel();
                mainPanel.setLayout(new GridBagLayout());
                GridBagConstraints c = new GridBagConstraints();

                //P1    FILL P1 WITH 64 BUTTONS
                p1 = new JPanel();
                p1.setLayout(new GridLayout(8, 8));

                p1.setMinimumSize(new Dimension(600, 600));
                p1.setMaximumSize(new Dimension(600, 600));
                p1.setPreferredSize(new Dimension(600, 600));

                for (int y = 0; y < 8; y++) {
                    for (int x = 0; x < 8; x++) {
                        JButton btn = new JButton(x + " , " + y);
                        p1.add(btn);
                    }
                }

                //P2    FILL P2 WITH 4 BUTTONS
                p2 = new JPanel();
                p2.setLayout(new GridLayout(4, 1));
                p2.setMinimumSize(new Dimension(150, 100));
                p2.setMaximumSize(new Dimension(150, 100));
                p2.setPreferredSize(new Dimension(150, 100));

                for (int i = 0; i < 4; i++) {
                    p2.add(new JButton("Button"));
                }

                //P3
                p3 = new JPanel();
                p3.setMinimumSize(new Dimension(100, 150));
                p3.setMaximumSize(new Dimension(100, 150));
                p3.setPreferredSize(new Dimension(100, 150));
                p3.setBackground(Color.BLUE);

                //ADD ALL TO mainPanel
                c.gridx = 0;
                c.gridy = 0;
                c.fill = GridBagConstraints.BOTH;
                c.weightx = 1;
                c.weighty = 1;
                mainPanel.add(p1, c);

                c.gridx = 1;
                c.gridheight = 2;
                c.weighty = 1;
                c.weightx = 0;
                c.fill = GridBagConstraints.VERTICAL;
                mainPanel.add(p2, c);

                c.gridx = 0;
                c.gridy = 1;
                c.gridheight = 1;
                c.gridwidth = 2;
                c.fill = GridBagConstraints.HORIZONTAL;
                c.weighty = 0;
                c.weightx = 1;
                mainPanel.add(p3, c);

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(mainPanel);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

}

Answer 2

我会考虑改用使用 BorderLayouts 的嵌套 JPanel。例如：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class EmielGui extends JPanel {
   protected static final int DELTA_DIMEN = 1;
   protected static final int MAX_DIMEN = 600;
   private static final int DELAY = 20;
   private JPanel rightPanel = new JPanel();
   private JPanel bottomPanel = new JPanel();
   private JPanel centerPanel = new JPanel();
   private int dimen = 100;

   public EmielGui() {
      JPanel tempCenterPanel = new JPanel(new BorderLayout());
      tempCenterPanel.add(centerPanel, BorderLayout.CENTER);
      tempCenterPanel.add(bottomPanel, BorderLayout.SOUTH);

      setLayout(new BorderLayout());
      add(rightPanel, BorderLayout.EAST);
      add(tempCenterPanel, BorderLayout.CENTER);

      rightPanel.setMinimumSize(new Dimension(150, 0));
      bottomPanel.setMinimumSize(new Dimension(0, 150));

      rightPanel.setPreferredSize(rightPanel.getMinimumSize());
      bottomPanel.setPreferredSize(bottomPanel.getMinimumSize());

      rightPanel.setBorder(BorderFactory.createLineBorder(Color.red));
      bottomPanel.setBorder(BorderFactory.createLineBorder(Color.blue));
      centerPanel.setBorder(BorderFactory.createLineBorder(Color.green));

      new Timer(DELAY, new ActionListener() {

         @Override
         public void actionPerformed(ActionEvent e) {
            dimen += DELTA_DIMEN;
            if (dimen < MAX_DIMEN) {
               centerPanel.setPreferredSize(new Dimension(dimen, dimen));
               SwingUtilities.getWindowAncestor(EmielGui.this).pack();

            } else {
               ((Timer) e.getSource()).stop();
            }
         }
      }).start();
   }

   private static void createAndShowGui() {
      EmielGui mainPanel = new EmielGui();

      JFrame frame = new JFrame("EmielGui");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

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