MouseListener en Java
// Java program to handle MouseListener events
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Mouse extends Frame implements MouseListener {
// Jlabels to display the actions of events of mouseListener
// static JLabel label1, label2, label3;
// default constructor
Mouse()
{
}
// main class
public static void main(String[] args)
{
// create a frame
JFrame f = new JFrame("MouseListener");
// set the size of the frame
f.setSize(600, 100);
// close the frame when close button is pressed
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// create anew panel
JPanel p = new JPanel();
// set the layout of the panel
p.setLayout(new FlowLayout());
// initialize the labels
label1 = new JLabel("no event ");
label2 = new JLabel("no event ");
label3 = new JLabel("no event ");
// create an object of mouse class
Mouse m = new Mouse();
// add mouseListener to the frame
f.addMouseListener(m);
// add labels to the panel
p.add(label1);
p.add(label2);
p.add(label3);
// add panel to the frame
f.add(p);
f.show();
}
// getX() and getY() functions return the
// x and y coordinates of the current
// mouse position
// getClickCount() returns the number of
// quick consecutive clicks made by the user
// this function is invoked when the mouse is pressed
public void mousePressed(MouseEvent e)
{
// show the point where the user pressed the mouse
label1.setText("mouse pressed at point:"
+ e.getX() + " " + e.getY());
}
// this function is invoked when the mouse is released
public void mouseReleased(MouseEvent e)
{
// show the point where the user released the mouse click
label1.setText("mouse released at point:"
+ e.getX() + " " + e.getY());
}
// this function is invoked when the mouse exits the component
public void mouseExited(MouseEvent e)
{
// show the point through which the mouse exited the frame
label2.setText("mouse exited through point:"
+ e.getX() + " " + e.getY());
}
// this function is invoked when the mouse enters the component
public void mouseEntered(MouseEvent e)
{
// show the point through which the mouse entered the frame
label2.setText("mouse entered at point:"
+ e.getX() + " " + e.getY());
}
// this function is invoked when the mouse is pressed or released
public void mouseClicked(MouseEvent e)
{
// getClickCount gives the number of quick,
// consecutive clicks made by the user
// show the point where the mouse is i.e
// the x and y coordinates
label3.setText("mouse clicked at point:"
+ e.getX() + " "
+ e.getY() + "mouse clicked :" + e.getClickCount());
}
}
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