鼠标拖动自定义JFrame(JDialog同理)
- Java
- 2017-07-15
- 113热度
- 0评论
自定义 JFrame(或JDialog),用 setUndecorated 隐藏了标题栏和边框。如何拖动它?自己写鼠标监听,根据鼠标事件更新 JFrame 的位置即可。
以下示例代码来自 StackOverFlow:
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);
}
}
}