import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class Main extends JComponent {
public static void main(String[] args) {
JFrame frame = new JFrame();
final JButton activate = new JButton("Show");
frame.add(activate);
frame.pack();
frame.setVisible(true);
final Main glass = new Main(frame);
frame.setGlassPane(glass);
activate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
glass.setVisible(true);
}
});
}
JFrame frame;
Point cursor;
public Main(JFrame frame) {
this.frame = frame;
cursor = new Point();
this.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseMoved(MouseEvent evt) {
cursor = new Point(evt.getPoint());
Main.this.repaint();
}
});
this.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent evt) {
Main.this.setVisible(false);
}
});
}
public void paint(Graphics g) {
Container root = frame.getContentPane();
myPaint(root, g);
}
private void myPaint(Component comp, Graphics g) {
int x = comp.getX();
int y = comp.getY();
g.translate(x, y);
cursor.translate(-x, -y);
if (comp.contains(cursor)) {
String cls_name = comp.getClass().getName();
g.setColor(Color.black);
g.drawString(cls_name, 0, 10);
}
if (comp instanceof Container) {
Container cont = (Container) comp;
for (int i = 0; i < cont.getComponentCount(); i++) {
Component child = cont.getComponent(i);
myPaint(child, g);
}
}
cursor.translate(x, y);
g.translate(-x, -y);
}
}