当您单击并拖动它时,蓝色标签会移动。这可行,但 x/y 位置然后以一种有趣的方式跳跃。
代码如下:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class test extends JFrame implements MouseListener, MouseMotionListener {
private JPanel panel = new JPanel(null);
private JLabel label1 = new JLabel();
private JLabel label2 = new JLabel();
private int mouseX = 200;
private int mouseY = 100;
private boolean drag = false;
public test() {
this.add(panel);
panel.setBackground(Color.WHITE);
panel.add(label1);
label1.setOpaque(true);
label1.setBackground(Color.BLUE);
label1.setBounds(mouseX, mouseY, 100, 50);
label1.addMouseMotionListener(this);
label1.addMouseListener(this);
panel.add(label2);
label2.setOpaque(true);
label2.setBackground(Color.RED);
label2.setBounds(mouseX + 200, mouseY, 100, 50);
label2.addMouseMotionListener(this);
label2.addMouseListener(this);
}
@Override
public void mousePressed(MouseEvent e) {
if (e.getSource() == label1) {
drag = true;
}
}
@Override
public void mouseReleased(MouseEvent e) {
drag = false;
}
@Override
public void mouseDragged(MouseEvent e) {
if (drag == true) {
mouseX = e.getX();
mouseY = e.getY();
label1.setBounds(mouseX, mouseY, 100, 50);
}
}
public void mouseMoved(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseClicked(MouseEvent e) {}
public static void main(String[] args) {
test frame = new test();
frame.setVisible(true);
frame.setSize(600, 400);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
最佳答案
只需将其放在您的 MouseDragged
方法中:
public void mouseDragged(MouseEvent e)
{
if (drag == true)
{
JComponent jc = (JComponent)e.getSource();
jc.setLocation(jc.getX()+e.getX(), jc.getY()+e.getY());
}
}
关于java jlabel 单击/拖动,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4894356/