java - 难以在多个 JPanel 中对齐组件

Question

我正在尝试创建一个布局，其中有两个带有边框的面板。我希望矩形边框大小相等。我还希望底部面板中的 JTextField 具有较小的宽度。

问题是，每当我水平填充底部面板(使用 GridBagConstraints.HORIZONTAL)时，该面板内的复选框和标签就会与其上方面板中的复选框和标签不对齐。

我希望一位经验丰富的开发人员能够提供有关如何使两个 JPanel 及其矩形边框大小彼此相等，同时对齐复选框和标签的见解。

这是现在的样子:

这里是重现问题的代码:

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.Border;

public class Example
{
    public static void main(String[] args) 
    {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try 
                {
                    MyFrame frame = new MyFrame();
                } 
                catch (Exception e) 
                {
                    e.printStackTrace();
                }
            }
        });
    }
}

class MyFrame
{
    private JFrame frame;

    private MyDialog dialog;

    public MyFrame()
    {
        frame = new JFrame();

        frame.setSize(300, 300);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        dialog = new MyDialog(frame);
    }
}

class MyDialog
{
    private JDialog dialog;

    private JPanel mainPanel,
                   panel1,
                   inputPanel1,
                   panel2,
                   inputPanel2;

    private JLabel titleLabel,
                   label1,
                   label2;

    private JCheckBox checkBox1,
                      checkBox2;

    private JTextField textField1,
                       textField2;

    public MyDialog(JFrame frame)
    {
        dialog = new JDialog(frame, true);

        buildPanel();

        dialog.add(mainPanel);

        dialog.pack();
        dialog.setLocationRelativeTo(frame);
        dialog.setVisible(true);
    }

    private void buildPanel()
    {
        mainPanel = new JPanel(new GridBagLayout());

        titleLabel = new JLabel("Title");



        checkBox1 = new JCheckBox("checkBox1");

        label1 = new JLabel("label1:");

        textField1 = new JTextField(15);

        inputPanel1 = new JPanel(new GridBagLayout());
        inputPanel1.setBorder(BorderFactory.createEmptyBorder(0, 17, 0, 0));  // indent the label and textfield
        inputPanel1.add(label1, getConstraints(0, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        inputPanel1.add(textField1, getConstraints(1, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));

        panel1 = new JPanel(new GridBagLayout());
        Border border1 = BorderFactory.createEtchedBorder();
        panel1.setBorder(border1);
        panel1.add(checkBox1, getConstraints(0, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        panel1.add(inputPanel1, getConstraints(0, 1, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));



        checkBox2 = new JCheckBox("checkBox2");

        label2 = new JLabel("label2:");

        textField2 = new JTextField(8);

        inputPanel2 = new JPanel(new GridBagLayout());
        inputPanel2.setBorder(BorderFactory.createEmptyBorder(0, 17, 0, 0));  // indent the label and textfield
        inputPanel2.add(label2, getConstraints(0, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        inputPanel2.add(textField2, getConstraints(1, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));

        panel2 = new JPanel(new GridBagLayout());
        Border border2 = BorderFactory.createEtchedBorder();
        panel2.setBorder(border2);
        panel2.add(checkBox2, getConstraints(0, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        panel2.add(inputPanel2, getConstraints(0, 1, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));



        mainPanel.add(titleLabel, getConstraints(0, 0, 2, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE));
        mainPanel.add(panel1, getConstraints(0, 1, 2, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        mainPanel.add(panel2, getConstraints(0, 2, 2, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        // When I fill panel2 horizontally, the checkbox becomes misaligned with the above checkbox:
        //mainPanel.add(panel2, getConstraints(0, 2, 2, 1, GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL));


  }

  private GridBagConstraints getConstraints(int gridx, int gridy, int gridwidth, int gridheight, int anchor, int fill)
  {
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.insets = new Insets(5, 5, 5, 5);
      gbc.ipadx = 0;
      gbc.ipady = 0;
      gbc.gridx = gridx;
      gbc.gridy = gridy;
      gbc.gridwidth = gridwidth;
      gbc.gridheight = gridheight;
      gbc.anchor = anchor;
      gbc.fill = fill;

      return gbc;
  }

}

Answer 1

我所做的是

• 让您的 inputPanelX 具有带有 FlowLayout.LEADING 的 FlowLayout，而不是使用 GirdBagLayout。

  inputPanel1 = new JPanel(new FlowLayout(FlowLayout.LEADING));
  

• 第二个我刚刚制作了与第一个相同的Dimension

  inputPanel2 = new JPanel(new FlowLayout(FlowLayout.LEADING)){
      Dimension dim = new Dimension(inputPanel1.getPreferredSize());
      public Dimension getPreferredSize(){
          return new Dimension(dim);
      }
  };
  

这就是我改变的一切。请参阅下面的完整代码

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.Border;

public class Example
{
    public static void main(String[] args) 
    {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try 
                {
                    MyFrame frame = new MyFrame();
                } 
                catch (Exception e) 
                {
                    e.printStackTrace();
                }
            }
        });
    }
}

class MyFrame
{
    private JFrame frame;

    private MyDialog dialog;

    public MyFrame()
    {
        frame = new JFrame();

        frame.setSize(300, 300);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        dialog = new MyDialog(frame);
    }
}

class MyDialog
{
    private JDialog dialog;

    private JPanel mainPanel,
                   panel1,
                   inputPanel1,
                   panel2,
                   inputPanel2;

    private JLabel titleLabel,
                   label1,
                   label2;

    private JCheckBox checkBox1,
                      checkBox2;

    private JTextField textField1,
                       textField2;

    public MyDialog(JFrame frame)
    {
        dialog = new JDialog(frame, true);

        buildPanel();

        dialog.add(mainPanel);

        dialog.pack();
        dialog.setLocationRelativeTo(frame);
        dialog.setVisible(true);
    }

    private void buildPanel()
    {
        mainPanel = new JPanel(new GridBagLayout());

        titleLabel = new JLabel("Title");



        checkBox1 = new JCheckBox("checkBox1");

        label1 = new JLabel("label1:");

        textField1 = new JTextField(15);

        inputPanel1 = new JPanel(new FlowLayout(FlowLayout.LEADING));

        inputPanel1.setBorder(BorderFactory.createEmptyBorder(0, 17, 0, 0));  // indent the label and textfield
        inputPanel1.add(label1);
        inputPanel1.add(textField1);

        panel1 = new JPanel(new GridBagLayout());
        Border border1 = BorderFactory.createEtchedBorder();
        panel1.setBorder(border1);
        panel1.add(checkBox1, getConstraints(0, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        panel1.add(inputPanel1, getConstraints(0, 1, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));



        checkBox2 = new JCheckBox("checkBox2");

        label2 = new JLabel("label2:");

        textField2 = new JTextField(8);

        inputPanel2 = new JPanel(new FlowLayout(FlowLayout.LEADING)){
            Dimension dim = new Dimension(inputPanel1.getPreferredSize());
            public Dimension getPreferredSize(){
                return new Dimension(dim);
            }
        };
        inputPanel2.setBorder(BorderFactory.createEmptyBorder(0, 17, 0, 0));  // indent the label and textfield
        inputPanel2.add(label2, getConstraints(0, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        inputPanel2.add(textField2, getConstraints(1, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));

        panel2 = new JPanel(new GridBagLayout());
        Border border2 = BorderFactory.createEtchedBorder();
        panel2.setBorder(border2);
        panel2.add(checkBox2, getConstraints(0, 0, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        panel2.add(inputPanel2, getConstraints(0, 1, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));



        mainPanel.add(titleLabel, getConstraints(0, 0, 2, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE));
        mainPanel.add(panel1, getConstraints(0, 1, 2, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        mainPanel.add(panel2, getConstraints(0, 2, 2, 1, GridBagConstraints.WEST, GridBagConstraints.NONE));
        // When I fill panel2 horizontally, the checkbox becomes misaligned with the above checkbox:
        //mainPanel.add(panel2, getConstraints(0, 2, 2, 1, GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL));


  }

  private GridBagConstraints getConstraints(int gridx, int gridy, int gridwidth, int gridheight, int anchor, int fill)
  {
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.insets = new Insets(5, 5, 5, 5);
      gbc.ipadx = 0;
      gbc.ipady = 0;
      gbc.gridx = gridx;
      gbc.gridy = gridy;
      gbc.gridwidth = gridwidth;
      gbc.gridheight = gridheight;
      gbc.anchor = anchor;
      gbc.fill = fill;

      return gbc;
  }

}