java - 制作一个 java swing frame 可移动和 setUndecorated

Question

我创建了一个没有标题栏的框架，为此我使用了 setUndecorated(true); 方法，但之后框架由于某种原因变得不可移动。

我怎样才能使我的框架可移动并仍然隐藏我的标题栏？

Answer 1

以下代码将创建一个没有标题栏的 JFrame，您仍然可以移动它：

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class FrameDragListenerExample {

    public static void main(String[] args) {
        Runnable runnable = new Runnable() {
            public void run() {
                final JFrame frame = new JFrame("Hello");

                frame.setUndecorated(true);
                frame.setBounds(0, 0, 400, 400);

                JPanel contentPane = new JPanel(new BorderLayout());
                JLabel label = new JLabel("Click anywhere in the Jframe and drag");
                label.setFont(label.getFont().deriveFont(16f));
                label.setBorder(BorderFactory.createEmptyBorder(100, 100, 100, 100));
                contentPane.add(label);
                frame.setContentPane(contentPane);

                FrameDragListener frameDragListener = new FrameDragListener(frame);
                frame.addMouseListener(frameDragListener);
                frame.addMouseMotionListener(frameDragListener);

                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        };
        SwingUtilities.invokeLater(runnable);
    }

    public static class FrameDragListener extends MouseAdapter {

        private final JFrame frame;
        private Point mouseDownCompCoords = null;

        public FrameDragListener(JFrame frame) {
            this.frame = frame;
        }

        public void mouseReleased(MouseEvent e) {
            mouseDownCompCoords = null;
        }

        public void mousePressed(MouseEvent e) {
            mouseDownCompCoords = e.getPoint();
        }

        public void mouseDragged(MouseEvent e) {
            Point currCoords = e.getLocationOnScreen();
            frame.setLocation(currCoords.x - mouseDownCompCoords.x, currCoords.y - mouseDownCompCoords.y);
        }
    }
}

您仍然可以通过拖动框架的主体来拖动它。

Answer 2

也许这会帮助你 移动窗口

Answer 3

我为你封装了一个扩展JFrame类，我称之为MoveaFrame，你只需要在实践中“扩展MoveaFrame”即可：

只需将以下代码复制到您的项目中，并扩展它，您就可以使您的 Frame 窗口可拖动！

MoveJFrame像 extend a 一样扩展，JFrame你可以直接拖动你的窗口：

public class ContactUi extends MoveJFrame implements  Runnable {

类MoveJFrame 代码，只需复制它并像 extend 一样扩展它JFrame：

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.IOException;

public class MoveJFrame extends JFrame {

    public MoveJFrame() {


        this.setUndecorated(true);


        FrameDragListener frameDragListener = new FrameDragListener(this);
        this.addMouseListener(frameDragListener);
        this.addMouseMotionListener(frameDragListener);

        this.pack();
        this.setLocationRelativeTo(null);
        this.setVisible(true);

    }

    public static void main(String[] args) throws IOException {
        new MoveJFrame();
    }

    public static class FrameDragListener extends MouseAdapter {

        private final JFrame frame;
        private Point mouseDownCompCoords = null;

        public FrameDragListener(JFrame frame) {
            this.frame = frame;
        }

        public void mouseReleased(MouseEvent e) {
            mouseDownCompCoords = null;
        }

        public void mousePressed(MouseEvent e) {
            mouseDownCompCoords = e.getPoint();
        }

        public void mouseDragged(MouseEvent e) {
            Point currCoords = e.getLocationOnScreen();
            frame.setLocation(currCoords.x - mouseDownCompCoords.x, currCoords.y - mouseDownCompCoords.y);
        }
    }
}