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该脚本可以很好地拖动一张图片,但是如果我试图让它们中的两个同时进行,就好像该类只能被调用一次一样?这里是我添加两个imageicons的代码,但只有一个正在显示:为什么我的代码不能同时显示frame.add?
import java.awt.*;
import javax.swing.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseAdapter;
public class TestMouseDrag {
public static void main(String[] args) {
new TestMouseDrag();
}
public TestMouseDrag() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new DragMyIcon("C:\\Users\\anon\\Desktop\\Hobbit.png")).setLocation(100, 100);
frame.add(new DragMyIcon("C:\\Users\\anon\\Desktop\\alien.png")).setLocation(100, 100)
frame.pack();
frame.setSize(700,700);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class DragMyIcon extends JPanel {
public static final long serialVersionUID = 172L;
private JLabel label;
public DragMyIcon(String path) {
setLayout(null);
ImageIcon icon = null;
icon = new ImageIcon(path);
label = new JLabel(icon);
label.setBounds(0,0,100, 100);
label.setHorizontalAlignment(JLabel.CENTER);
label.setVerticalAlignment(JLabel.CENTER);
add(label);
MouseHandler handler = new MouseHandler();
label.addMouseListener(handler);
label.addMouseMotionListener(handler);
}
}
protected class MouseHandler extends MouseAdapter {
private boolean active = false;
private int xDisp;
private int yDisp;
@Override
public void mousePressed(MouseEvent e) {
active = true;
JLabel label = (JLabel) e.getComponent();
xDisp = e.getPoint().x - label.getLocation().x;
yDisp = e.getPoint().y - label.getLocation().y;
label.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
}
@Override
public void mouseReleased(MouseEvent e) {
active = false;
JLabel label = (JLabel) e.getComponent();
label.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}
@Override
public void mouseDragged(MouseEvent e) {
if (active) {
JLabel label = (JLabel) e.getComponent();
Point point = e.getPoint();
label.setLocation(point.x - xDisp, point.y - yDisp);
label.invalidate();
label.repaint();
}
}
@Override
public void mouseMoved(MouseEvent e) {
}
}}
您明白'JFrame'默认使用'BorderLayout',并且它只允许单个组件驻留在5个可用插槽中的任何一个中。这意味着通过添加第二张图片,您可以有效移除第一张图片。另外,在拖动标签之后尝试调整窗口大小... – MadProgrammer