使 java 摆动框架可移动和 setUndecorated

Making a java swing frame movable and setUndecorated

提问by Imri Persiado

I have created a frame without the title bar, for that I used the setUndecorated(true); method but after that the frame is became unmovable for some reason.

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

How can I make my frame movable and still hide my title bar?

如何使我的框架可移动并仍然隐藏我的标题栏？

回答by Erik Pragt

The following code will create a JFrame without a title bar, which you can still move around:

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);
        }
    }
}

You can still drag it around by dragging the body of the frame.

您仍然可以通过拖动框架的主体来拖动它。

回答by DRastislav

Maybe this will help you Moving Window

也许这会帮助你 移动窗口

回答by Super-ilad

I encapsulate a extended JFrameclass for you, I called it MoveaFrame, you just need to "extend MoveaFrame" in your practice:

我JFrame给你封装了一个扩展类，我叫它MoveaFrame，你只需要在你的实践中“扩展MoveaFrame”即可：

Just copy below codes to your project, and extend it, you can make your Frame window draggable!

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！

Extend MoveJFramelike extend a JFrame, you can directly drag your window:

延长MoveJFrame像扩展JFrame，你可以直接拖动窗口：

public class ContactUi extends MoveJFrame implements  Runnable {

The MoveJFrameclass code, just copy it and extend it like extend JFrame:

在MoveJFrame类代码，只需将它复制并扩展它就像延伸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);
        }
    }
}