java - 在对话框中对齐复选框

Question

我想根据其他相应字段对齐复选框(红色突出显示区域)。

这是我用来生成它的主要方法

public class DialogTesting extends JFrame{

public static void main(String args[])
{

    JFrame frame = new JFrame();
    frame.setSize(320,250);
    frame.setLocation(400,400);

    JTextField txtUserName,txtHostName,txtPortNo,txtSID;
    JPasswordField txtPassword;
    JPanel mainPanel;
    JCheckBox chkBoxSaveConnection;

    mainPanel = new JPanel();
    mainPanel.setBorder(BorderFactory.createEmptyBorder());
    mainPanel.setPreferredSize(new Dimension(300, 210));
    mainPanel.setLayout(new FlowLayout());


    JLabel l_label = null;
    txtUserName = new JTextField("K_USERNAME", 15);
    txtUserName.putClientProperty("maxlength", 200);
    l_label = new JLabel("User Name");
    l_label.setPreferredSize(new Dimension(100, 30));
    mainPanel.add(l_label);
    mainPanel.add(txtUserName);

    txtPassword = new JPasswordField("K_PASSWORD", 15);
    txtUserName.putClientProperty("maxlength", 200);
    l_label = new JLabel("Password");
    l_label.setPreferredSize(new Dimension(100, 30));
    mainPanel.add(l_label);
    mainPanel.add(txtPassword);

    txtHostName = new JTextField("K_HOSTNAME", 15);
    txtHostName.putClientProperty("maxlength", 200);
    l_label = new JLabel("Host Name");
    l_label.setPreferredSize(new Dimension(100, 30));
    mainPanel.add(l_label);
    mainPanel.add(txtHostName);

    txtPortNo = new JTextField("K_PORTNO", 15);

    l_label = new JLabel("Port Number");
    l_label.setPreferredSize(new Dimension(100, 30));
    txtPortNo.putClientProperty("maxlength", 200);
    mainPanel.add(l_label);
    mainPanel.add(txtPortNo);


    txtSID = new JTextField("K_SID", 15);
    l_label = new JLabel("SID number");
    l_label.setPreferredSize(new Dimension(100, 30));
    txtPortNo.putClientProperty("maxlength", 200);
    mainPanel.add(l_label);
    mainPanel.add(txtSID);

    chkBoxSaveConnection = new JCheckBox();
    l_label = new JLabel("chkBoxSaveConnection");
    l_label.setPreferredSize(new Dimension(150, 30));
    mainPanel.add(l_label);
    mainPanel.add(chkBoxSaveConnection);

    mainPanel.setVisible(true);

    frame.add(mainPanel);
    frame.setVisible(true);

}
}

这里我想让复选框(红色突出显示区域)根据其他字段对齐

我尝试了这个解决方案以使其正确对齐

mainPanel.setLayout(new GridLayout()); 
GridBagConstraints l_bag_constraints = new GridBagConstraints();
l_bag_constraints.fill = GridBagConstraints.HORIZONTAL;
mainPanel.add(jlabel,FieldMapperHelper.getGridBagCompPosition(l_bag_constraints,0,0,10,1,0,10)
            );
    mainPanel.add(txtUserName
            ,FieldMapperHelper.getGridBagCompPosition(l_bag_constraints,0,1,10,1,0,10)
            );

但在这种情况下，它向我显示非常小的文本框。

除此之外，如果您还想要其他东西，请告诉我。

Answer 1

好吧，所以你的问题是你没有使用合适的布局管理器，并且你还被迫设置首选尺寸(你不应该这样做)。

这是代码的更新版本，它使用 GridBagLayout 并且应该可以很好地工作:

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

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class DialogTesting {

    protected void initUI() {

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JTextField txtUserName, txtHostName, txtPortNo, txtSID;
        JPasswordField txtPassword;
        JPanel mainPanel;
        JCheckBox chkBoxSaveConnection;

        GridBagConstraints firstCol = new GridBagConstraints();
        firstCol.weightx = 1.0;
        firstCol.anchor = GridBagConstraints.WEST;
        firstCol.insets = new Insets(5, 20, 5, 5);

        GridBagConstraints lastCol = new GridBagConstraints();
        lastCol.gridwidth = GridBagConstraints.REMAINDER;
        lastCol.weightx = 1.0;
        lastCol.fill = GridBagConstraints.HORIZONTAL;
        lastCol.insets = new Insets(5, 5, 5, 20);

        mainPanel = new JPanel(new GridBagLayout());

        JLabel l_label = null;
        txtUserName = new JTextField("K_USERNAME", 15);
        txtUserName.putClientProperty("maxlength", 200);
        l_label = new JLabel("User Name");
        mainPanel.add(l_label, firstCol);
        mainPanel.add(txtUserName, lastCol);

        txtPassword = new JPasswordField("K_PASSWORD", 15);
        txtUserName.putClientProperty("maxlength", 200);
        l_label = new JLabel("Password");
        mainPanel.add(l_label, firstCol);
        mainPanel.add(txtPassword, lastCol);

        txtHostName = new JTextField("K_HOSTNAME", 15);
        txtHostName.putClientProperty("maxlength", 200);
        l_label = new JLabel("Host Name");
        mainPanel.add(l_label, firstCol);
        mainPanel.add(txtHostName, lastCol);

        txtPortNo = new JTextField("K_PORTNO", 15);

        l_label = new JLabel("Port Number");
        txtPortNo.putClientProperty("maxlength", 200);
        mainPanel.add(l_label, firstCol);
        mainPanel.add(txtPortNo, lastCol);

        txtSID = new JTextField("K_SID", 15);
        l_label = new JLabel("SID number");
        txtPortNo.putClientProperty("maxlength", 200);
        mainPanel.add(l_label, firstCol);
        mainPanel.add(txtSID, lastCol);

        chkBoxSaveConnection = new JCheckBox();
        l_label = new JLabel("chkBoxSaveConnection");
        mainPanel.add(l_label, firstCol);
        mainPanel.add(chkBoxSaveConnection, lastCol);

        frame.add(mainPanel);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String args[]) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new DialogTesting().initUI();
            }
        });
    }
}