设置 JDialog 相对于 JFrame 的位置 [英] Set location of JDialog relative to JFrame

问题描述

有没有办法设置相对于 JFrame 的对话框位置?

Is there a way to set a dialog location relative to a JFrame?

我想将对话框居中放置在我的 GUI 所在的框架上，而不是对话框经常出现在屏幕中心而不是 GUI 内.

I would like to center the dialog to the frame that houses my GUI, instead the dialog often appears in the center of the screen rather than within the GUI.

推荐答案

有没有办法设置相对于另一个 JFrame 的位置

Is there a way to set a location relative to another JFrame

你可以:

• 传递 JFrame 作为 JDialog.setLocationRelativeTo(组件 c)
• 从 JFrame 到 JDialog.setLocation(Point p)

• pass JFrame as argument for JDialog.setLocationRelativeTo(Component c)
• set to desired Point from JFrame to JDialog.setLocation(Point p)

编辑

所有 Swing 代码都必须在 EventDispatchThread 上完成，意思是setVisible(true) 应该被包装到 invokeLater

all Swing code must be done on EventDispatchThread, meaning that setVisible(true) should be wrapped into invokeLater

EDIT2

当使用 JFrame 作为组件 c 时，我得到一个找不到符号错误

when using the JFrame as Component c I am getting a cannot find symbol error

不可能，有点小错误

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;

public class ClosingFrameDialog extends JFrame {

    private JFrame frame = new JFrame();
    private static final long serialVersionUID = 1L;
    private JMenuBar MenuBar;
    private JMenu File;
    private JMenuItem Exit;
    private JMenuItem ShowDialog;
    private JDialog dialog;
    private Point location;

    public ClosingFrameDialog() {
        Exit = new JMenuItem(" Exit ");
        Exit.addActionListener(new ExitListener());
        ShowDialog = new JMenuItem(" Show Dialog ");
        ShowDialog.addActionListener(showingDialog());
        File = new JMenu(" File ");
        File.add(Exit);
        File.add(ShowDialog);
        MenuBar = new JMenuBar();
        MenuBar.add(File);
        frame.addWindowListener(exitListener);
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.setJMenuBar(MenuBar);
        frame.setPreferredSize(new Dimension(400, 300));
        frame.setLocation(100, 100);
        frame.pack();
        frame.setVisible(true);
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                createDialog();
            }
        });
    }

    private void createDialog() {
        JButton btn = new JButton(" Save changes ");
        btn.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                //some stuff for saving whatewer programatically
                dialog.setVisible(false);
            }
        });
        JButton btn1 = new JButton(" Ignore changes ");
        btn1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                dialog.setLocationRelativeTo(frame);
                dialog.setVisible(false);
            }
        });
        dialog = new JDialog();
        dialog.add(btn);
        dialog.add(btn1);
        dialog.setVisible(false);
        dialog.setAlwaysOnTop(true);
        dialog.setModal(true);
        dialog.setLayout(new GridLayout(2, 0, 10, 10));
        JPanel pane = (JPanel) dialog.getContentPane();
        pane.setBorder(new EmptyBorder(10, 10, 10, 10));
        dialog.addWindowListener(closeListener);
        dialog.pack();
    }
//
    private WindowListener exitListener = new WindowAdapter() {

        @Override
        public void windowClosing(WindowEvent e) {
            int confirm = JOptionPane.showOptionDialog(frame,
                    "Are You Sure to Close this Application?",
                    "Exit Confirmation", JOptionPane.YES_NO_OPTION,
                    JOptionPane.QUESTION_MESSAGE, null, null, null);
            if (confirm == 0) {
                System.exit(1);
            }
        }

        @Override
        public void windowIconified(WindowEvent e) {
            int confirm = JOptionPane.showOptionDialog(frame,
                    "Are You Sure to Close this Application?",
                    "Exit Confirmation", JOptionPane.YES_NO_OPTION,
                    JOptionPane.QUESTION_MESSAGE, null, null, null);
            if (confirm == 0) {
                //System.exit(1);
            }
        }
    };
//
    private WindowListener closeListener = new WindowAdapter() {

        @Override
        public void windowClosing(WindowEvent e) {
            int confirm = JOptionPane.showOptionDialog(dialog,
                    "Are you want to save changes",
                    "Exit Confirmation", JOptionPane.YES_NO_OPTION,
                    JOptionPane.QUESTION_MESSAGE, null, null, null);
            if (confirm == 0) {
                //some stuff for saving whatewer programatically
                dialog.setVisible(true);
            } else if (confirm == 1) {// nothing only hide JDialog
                dialog.setVisible(true);
            }
        }
    };

    private Action showingDialog() {
        return new AbstractAction("Show Dialog") {

            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {
                Runnable doRun = new Runnable() {

                    @Override
                    public void run() {
                        dialog.setVisible(false);
                        location = frame.getLocationOnScreen();
                        int x = location.x;
                        int y = location.y;
                        //dialog.setLocation(x, y);
                        dialog.setLocationRelativeTo(frame);
                        dialog.setVisible(true);
                    }
                };
                SwingUtilities.invokeLater(doRun);
            }
        };
    }

    private class ExitListener implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            int confirm = JOptionPane.showOptionDialog(frame,
                    "Are You Sure to Close this Application?",
                    "Exit Confirmation", JOptionPane.YES_NO_OPTION,
                    JOptionPane.QUESTION_MESSAGE, null, null, null);
            if (confirm == 0) {
                System.exit(1);
            }
        }
    }

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

            @Override
            public void run() {
                ClosingFrameDialog cf = new ClosingFrameDialog();
            }
        });
    }
}

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