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我使用 GridBagLayout 和 GridBagConstraints 设计了一个 GUI。它包含可变数量的行，每行都有几种可能的列布局之一。为了测试代码，我使用不同颜色的面板 GUI 来说明每行和每列中所有单元格的位置和调整大小的行为。这个测试 GUI 工作正常，但现在我需要自动构建它。具体来说，我需要这些行是三种不同类型之一。如果您运行下面的代码并查看生成的 GUI，您可以看到第 1 行是一种类型，第 2、6 和 7 行是另一种类型，第 3、4 和 5 行是第三种类型。我需要将这三种类型的行中的每一种都封装在自己的类中。更重要的是，我需要我的代码能够创建可变数量的第三种类型的行（在示例中由第 3、4 和 5 行说明）。

当我尝试将行封装到它们自己的类中时，GUI 不再像它应该的样子。下面的测试代码会生成一个 GUI 布局，看起来应该是这样。谁能告诉我如何更改此代码以使其具有上面第一段中描述的功能？

您只需将下面的测试代码粘贴到您的 IDE 中即可立即运行。测试代码在两个单独的文件中，如下：

GridBagLayoutDemo.java 的代码是：

import java.awt.*;
import javax.swing.JFrame;

public class GridBagLayoutDemo {
    final static boolean RIGHT_TO_LEFT = false;

    public static void addComponentsToPane(Container pane) {
        if (RIGHT_TO_LEFT) {pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);}
        pane.setLayout(new GridBagLayout());

// top row (fill, gridx, gridy, gridwidth 1, weightx 0, weighty 0, ipady 0)
        TestPanel panelr1c1 = new TestPanel(Color.black);
        GridBagConstraints constraint_r1c1 = getGridBagConstraints(GridBagConstraints.NONE,0,0,1,0,0,0);
        pane.add(panelr1c1,constraint_r1c1);

        TestPanel panelr1c2 = new TestPanel(Color.blue);
        GridBagConstraints constraint_r1c2 = getGridBagConstraints(GridBagConstraints.HORIZONTAL,1,0,1,0.8,0,0);
        pane.add(panelr1c2,constraint_r1c2);

        TestPanel panelr1c2a = new TestPanel(Color.green);
        GridBagConstraints constraint_r1c2a = getGridBagConstraints(GridBagConstraints.HORIZONTAL,2,0,1,0.8,0,0);
        pane.add(panelr1c2a,constraint_r1c2a);

        TestPanel panelr1c3 = new TestPanel(Color.red);
        GridBagConstraints constraint_r1c3 = getGridBagConstraints(GridBagConstraints.NONE,3,0,1,0,0,0);
        pane.add(panelr1c3,constraint_r1c3);

        TestPanel panelr1c4 = new TestPanel(Color.blue);
        GridBagConstraints constraint_r1c4 = getGridBagConstraints(GridBagConstraints.NONE,4,0,1,0,0,0);
        pane.add(panelr1c4,constraint_r1c4);

// second row (fill, gridx, gridy, gridwidth 1, weightx 0, weighty 0, ipady 0)
        TestPanel panelr2c1 = new TestPanel(Color.magenta);
        GridBagConstraints constraint_r2c1 = getGridBagConstraints(GridBagConstraints.NONE,0,1,1,0,0,0);
        pane.add(panelr2c1,constraint_r2c1);

        TestPanel panelr2c2 = new TestPanel(Color.pink);
        GridBagConstraints constraint_r2c2 = getGridBagConstraints(GridBagConstraints.HORIZONTAL,1,1,2,1.0,0,0);
        pane.add(panelr2c2,constraint_r2c2);

        TestPanel panelr2c3 = new TestPanel(Color.black);
        GridBagConstraints constraint_r2c3 = getGridBagConstraints(GridBagConstraints.NONE,3,1,1,0,0,0);
        pane.add(panelr2c3,constraint_r2c3);

        TestPanel panelr2c4 = new TestPanel(Color.pink);
        GridBagConstraints constraint_r2c4 = getGridBagConstraints(GridBagConstraints.NONE,4,1,1,0,0,0);
        pane.add(panelr2c4,constraint_r2c4);

// third row (fill, gridx, gridy, gridwidth 1, weightx 0, weighty 0, ipady 0)
        TestPanel panelr3c1 = new TestPanel(Color.gray);
        GridBagConstraints constraint_r3c1 = getGridBagConstraints(GridBagConstraints.VERTICAL,0,2,1,0,0.5,40);
        pane.add(panelr3c1,constraint_r3c1);

        TestPanel panelr3c2 = new TestPanel(Color.orange);
        GridBagConstraints constraint_r3c2 = getGridBagConstraints(GridBagConstraints.BOTH,1,2,2,1.0,0.5,40);
        pane.add(panelr3c2,constraint_r3c2);

        TestPanel panelr3c3 = new TestPanel(Color.red);
        GridBagConstraints constraint_r3c3 = getGridBagConstraints(GridBagConstraints.VERTICAL,3,2,1,0,0.5,40);
        pane.add(panelr3c3,constraint_r3c3);

        TestPanel panelr3c4 = new TestPanel(Color.orange);
        GridBagConstraints constraint_r3c4 = getGridBagConstraints(GridBagConstraints.VERTICAL,4,2,1,0,0.5,40);
        pane.add(panelr3c4,constraint_r3c4);

// fourth row (fill, gridx, gridy, gridwidth 1, weightx 0, weighty 0, ipady 0)
        TestPanel panelr4c1 = new TestPanel(Color.black);
        GridBagConstraints constraint_r4c1 = getGridBagConstraints(GridBagConstraints.VERTICAL,0,3,1,0,0.5,40);
        pane.add(panelr4c1,constraint_r4c1);

        TestPanel panelr4c2 = new TestPanel(Color.white);
        GridBagConstraints constraint_r4c2 = getGridBagConstraints(GridBagConstraints.BOTH,1,3,2,1.0,0.5,40);
        pane.add(panelr4c2,constraint_r4c2);

        TestPanel panelr4c3 = new TestPanel(Color.green);
        GridBagConstraints constraint_r4c3 = getGridBagConstraints(GridBagConstraints.VERTICAL,3,3,1,0,0.5,40);
        pane.add(panelr4c3,constraint_r4c3);

        TestPanel panelr4c4 = new TestPanel(Color.blue);
        GridBagConstraints constraint_r4c4 = getGridBagConstraints(GridBagConstraints.VERTICAL,4,3,1,0,0.5,40);
        pane.add(panelr4c4,constraint_r4c4);

// fifth row (fill, gridx, gridy, gridwidth 1, weightx 0, weighty 0, ipady 0)
        TestPanel panelr5c1 = new TestPanel(Color.darkGray);
        GridBagConstraints constraint_r5c1 = getGridBagConstraints(GridBagConstraints.VERTICAL,0,4,1,0,0.5,40);
        pane.add(panelr5c1,constraint_r5c1);

        TestPanel panelr5c2 = new TestPanel(Color.yellow);
        GridBagConstraints constraint_r5c2 = getGridBagConstraints(GridBagConstraints.BOTH,1,4,2,1.0,0.5,40);
        pane.add(panelr5c2,constraint_r5c2);

        TestPanel panelr5c3 = new TestPanel(Color.white);
        GridBagConstraints constraint_r5c3 = getGridBagConstraints(GridBagConstraints.VERTICAL,3,4,1,0,0.5,40);
        pane.add(panelr5c3,constraint_r5c3);

        TestPanel panelr5c4 = new TestPanel(Color.orange);
        GridBagConstraints constraint_r5c4 = getGridBagConstraints(GridBagConstraints.VERTICAL,4,4,1,0,0.5,40);
        pane.add(panelr5c4,constraint_r5c4);

// sixth row (fill, gridx, gridy, gridwidth 1, weightx 0, weighty 0, ipady 0)
        TestPanel panelr6c1 = new TestPanel(Color.green);
        GridBagConstraints constraint_r6c1 = getGridBagConstraints(GridBagConstraints.NONE,0,5,1,0,0,0);
        pane.add(panelr6c1,constraint_r6c1);

        TestPanel panelr6c2 = new TestPanel(Color.blue);
        GridBagConstraints constraint_r6c2 = getGridBagConstraints(GridBagConstraints.HORIZONTAL,1,5,2,1.0,0,0);
        pane.add(panelr6c2,constraint_r6c2);

        TestPanel panelr6c3 = new TestPanel(Color.red);
        GridBagConstraints constraint_r6c3 = getGridBagConstraints(GridBagConstraints.NONE,3,5,1,0,0,0);
        pane.add(panelr6c3,constraint_r6c3);

        TestPanel panelr6c4 = new TestPanel(Color.black);
        GridBagConstraints constraint_r6c4 = getGridBagConstraints(GridBagConstraints.NONE,4,5,1,0,0,0);
        pane.add(panelr6c4,constraint_r6c4);

// seventh row (fill, gridx, gridy, gridwidth 1, weightx 0, weighty 0, ipady 0)
        TestPanel panelr7c1 = new TestPanel(Color.darkGray);
        GridBagConstraints constraint_r7c1 = getGridBagConstraints(GridBagConstraints.NONE,0,6,1,0,0,0);
        pane.add(panelr7c1,constraint_r7c1);

        TestPanel panelr7c2 = new TestPanel(Color.white);
        GridBagConstraints constraint_r7c2 = getGridBagConstraints(GridBagConstraints.HORIZONTAL,1,6,2,1.0,0,0);
        pane.add(panelr7c2,constraint_r7c2);

        TestPanel panelr7c3 = new TestPanel(Color.yellow);
        GridBagConstraints constraint_r7c3 = getGridBagConstraints(GridBagConstraints.NONE,3,6,1,0,0,0);
        pane.add(panelr7c3,constraint_r7c3);

        TestPanel panelr7c4 = new TestPanel(Color.green);
        GridBagConstraints constraint_r7c4 = getGridBagConstraints(GridBagConstraints.NONE,4,6,1,0,0,0);
        pane.add(panelr7c4,constraint_r7c4);
    }

    // Create the GUI and show it.  For thread safety, this method should be invoked from the event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("GridBagConstraint Practice");
        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) {
        //Schedule a job for the event-dispatching thread: creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {public void run() {createAndShowGUI();}});
    }
    private static GridBagConstraints getGridBagConstraints(int fill, int gridx, int gridy, int gridwidth, double weightx, double weighty, int ipady){
        GridBagConstraints myGridBagConstraints = new GridBagConstraints();
          myGridBagConstraints.fill=fill;
        myGridBagConstraints.gridx=gridx;
        myGridBagConstraints.gridy=gridy;
        myGridBagConstraints.gridwidth=gridwidth;
        myGridBagConstraints.weightx=weightx;
        myGridBagConstraints.weighty=weighty;
        myGridBagConstraints.ipady=ipady;
        return myGridBagConstraints;
    }
}

TestPanel.java 的代码是：

import java.awt.Color;
import javax.swing.JPanel;

public class TestPanel extends JPanel {
    public TestPanel (Color myColor){this.setBackground(myColor);}
}
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1 回答 1

6

Swing 布局的规则 1：无论您做什么，都不要使用 GridBagLayout。GridBagLayout 在 1998 年还不错。它的设计有问题，有缺陷，而且还没有进化。代码非常冗长、难以编写、难以理解和难以维护。

我推荐MigLayout，它是我见过的最通用和最直观的布局管理器。查看 MigLayout 站点上的快速入门指南，它比 GridBagLayout 简单得多，而且功能强大得多。这是您在 MigLayout 中的示例，我向您展示了如何重构您的行类型：

import net.miginfocom.swing.MigLayout;
import java.awt.*;
import javax.swing.*;

public class GridBagLayoutDemo {
    final static boolean RIGHT_TO_LEFT = false;

    public static void addComponentsToPane(Container pane) {
        if (RIGHT_TO_LEFT) {
            pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
        }
        pane.setLayout(new MigLayout("insets 0, gap 0, wrap", "[][fill, grow][fill, grow][][]", "[fill]"));

        addType1(pane, Color.BLACK, Color.BLUE, Color.GREEN, Color.RED, Color.BLUE);
        addType2(pane, Color.MAGENTA, Color.PINK, Color.BLACK, Color.PINK);
        addType3(pane, Color.GRAY, Color.ORANGE, Color.RED, Color.ORANGE);
        addType3(pane, Color.BLACK, Color.WHITE, Color.GREEN, Color.BLUE);
        addType3(pane, Color.DARK_GRAY, Color.YELLOW, Color.WHITE, Color.ORANGE);
        addType2(pane, Color.GREEN, Color.BLUE, Color.RED, Color.BLACK);
        addType2(pane, Color.DARK_GRAY, Color.WHITE, Color.YELLOW, Color.GREEN);
    }

    private static void addType1(Container pane, Color c1, Color c2, Color c3, Color c4, Color c5) {
        pane.add(new TestPanel(c1));
        pane.add(new TestPanel(c2));
        pane.add(new TestPanel(c3));
        pane.add(new TestPanel(c4));
        pane.add(new TestPanel(c5));
    }

    private static void addType2(Container pane, Color c1, Color c2, Color c3, Color c4) {
        pane.add(new TestPanel(c1));
        pane.add(new TestPanel(c2), "spanx 2");
        pane.add(new TestPanel(c3));
        pane.add(new TestPanel(c4));
    }

    private static void addType3(Container pane, Color c1, Color c2, Color c3, Color c4) {
        pane.add(new TestPanel(c1));
        pane.add(new TestPanel(c2), "spanx 2, pushy, hmin pref+40");
        pane.add(new TestPanel(c3));
        pane.add(new TestPanel(c4));
    }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("MigLayout Practice");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        addComponentsToPane(frame.getContentPane());
        frame.pack();
        frame.setVisible(true);
    }

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

class TestPanel extends JPanel {
    public TestPanel(Color myColor) {
        this.setBackground(myColor);
    }
}

这会产生与您的示例完全相同的布局。可能您想要hmin 40代替 hmin pref+40，后者产生与在 GridBagConstraints 中设置 ipady=40 相同的结果。

并且请在 Color 类中使用大写常量，小写常量确实应该被弃用。

对于任何想知道这种布局是什么样子的人，这里是：

在此处输入图像描述

于 2011-09-22T11:44:23.780 回答