My goal was to simplify this code (all works fine):
package test;
import java.awt.Window;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JWindow;
public class A extends JWindow implements MouseListener, MouseMotionListener {
public A() {
addMouseListener(A.this);
addMouseMotionListener(A.this);
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
//This method is being used, working fine
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mouseDragged(MouseEvent e) {
//This method is being used, working fine
}
@Override
public void mouseMoved(MouseEvent e) {
}
}
But if I decide to use MouseAdapter
like this:
addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
transferFocusBackward();
//This method is being used, working fine
}
@Override
public void mouseDragged(MouseEvent e) {
//This method is being used, not working anymore
}
});
mouseDragged
receiving no events. But if I add MouseMotionListener
like this:
addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
//This method is being used, working fine
}
});
addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseDragged(MouseEvent e) {
//This method is being used, working fine
}
});
Then everything backs to normal. So my question is - what is the purpose of mouseDragged
, mouseMoved
and mouseWheelMoved
methods in MouseAdapter
class if they do not work?
OK, I think I understand now: in MouseAdapter
class documentation it is said that "Create a listener object using the extended class and then register it with a component using the component's addMouseListener
, addMouseMotionListener
, addMouseWheelListener
methods". So now it looks like:
private class MouseListeners extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
//This method is being used, working fine
}
@Override
public void mouseDragged(MouseEvent e) {
//This method is being used, working fine
}
}
and then:
MouseListeners listeners = new MouseListeners();
addMouseListener(listeners);
addMouseMotionListener(listeners);
Now everything is OK.