问题描述
所以我一直在开发一个程序,我想用 jframe.setUndecorated(true);
使它无边界。但是,我无法真正在屏幕上移动 JFrame 窗口。有什么办法可以解决这个问题吗?
这是我当前的 JFrame 代码:
JFrame frame = new JFrame();
frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(700,450);
frame.setLocationRelativeto(null);
frame.setUndecorated(true);
frame.getContentPane().setBackground(Color.BLACK);
解决方法
要移动 JFrame,请在 JFrame 内的某处左键单击,将鼠标拖动到新位置,并在 JFrame 处于正确位置时释放鼠标按钮。
这是完整的可运行代码。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class MoveUndecoratedJFrame implements Runnable {
public static void main(String[] args) {
SwingUtilities.invokeLater(new MoveUndecoratedJFrame());
}
private JFrame frame;
@Override
public void run() {
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
frame.add(createMainPanel(),BorderLayout.CENTER);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private JPanel createMainPanel() {
JPanel panel = new JPanel(new FlowLayout());
MoveListener listener = new MoveListener();
panel.addMouseListener(listener);
panel.addMouseMotionListener(listener);
panel.setBackground(Color.BLACK);
panel.setPreferredSize(new Dimension(700,400));
return panel;
}
public class MoveListener implements MouseListener,MouseMotionListener {
private Point pressedPoint;
private Rectangle frameBounds;
@Override
public void mouseClicked(MouseEvent event) {
}
@Override
public void mousePressed(MouseEvent event) {
this.frameBounds = frame.getBounds();
this.pressedPoint = event.getPoint();
}
@Override
public void mouseReleased(MouseEvent event) {
moveJFrame(event);
}
@Override
public void mouseEntered(MouseEvent event) {
}
@Override
public void mouseExited(MouseEvent event) {
}
@Override
public void mouseDragged(MouseEvent event) {
moveJFrame(event);
}
@Override
public void mouseMoved(MouseEvent event) {
}
private void moveJFrame(MouseEvent event) {
Point endPoint = event.getPoint();
int xDiff = endPoint.x - pressedPoint.x;
int yDiff = endPoint.y - pressedPoint.y;
frameBounds.x += xDiff;
frameBounds.y += yDiff;
frame.setBounds(frameBounds);
}
}
}