在Java中，我尝试使用容器类中的getComponentAt（x，y）方法。但是对于给定的（x，y）坐标，即使（x，y）包含一些image / JLabel / JButton，它也总是返回给我javax.swing.JRootPane类的对象。
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class temp2 implements MouseListener{
public static void main(String[] arg){
frame = new JFrame("adsa");
frame.setBounds(0, 0, 1000, 1000);
frame.setVisible(true);
frame.addMouseListener(new temp2());
JButton l = new JButton("asdasd");
frame.add(l);
l.addMouseListener(new temp2());;
}
static JFrame frame;
@Override
public void mouseClicked(MouseEvent e) {
int x = e.getX();
int y = e.getY();
System.out.println(frame.getComponentAt(x, y).getClass());
System.out.println(frame.getComponentAt(x, y) instanceof JButton);
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
}
这是我用于测试的示例代码。
每当我单击按钮时，我都会得到以下输出：
class javax.swing.JRootPane
false
最佳答案
您必须寻找SwingUtilities#getDeepestComponentAt，例如
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
public class TestMouseListener {
public static void main(String[] args) {
final JComboBox combo = new JComboBox();
combo.setEditable(true);
for (int i = 0; i < 10; i++) {
combo.addItem(i);
}
final JLabel tip = new JLabel();
tip.setText("Outside combobox");
JPanel panel = new JPanel();
panel.add(combo);
panel.add(tip);
panel.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent e) {
tip.setText("Outside combobox");
}
@Override
public void mouseExited(MouseEvent e) {
Component c = SwingUtilities.getDeepestComponentAt(
e.getComponent(), e.getX(), e.getY());
tip.setText(c != null && SwingUtilities.isDescendingFrom(
c, combo) ? "Inside combo box" : "Outside combobox");
}
});
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
private TestMouseListener() {
}
}