Mouse cursor detecting Java

Question

I would want my mouse positions to get detected for dragging object. I want the object will be able to be dragged only when the mouse cursor is pointing at the object

I can drag the object with .setObjPos(e.getX(),e.getY()). But the object keep jump to wherever the mouse cursor is. I want the object can only be dragged when the mouse cursor pointing at the object.

• Stultuske: ok. and what is stopping you from implementing that? Get the coordinates of the mouse, check if they 're (still) on that of the object.

Answer 1

You can achieve this quite easily by implementing a custom MouseListener:

public final class DragListener extends MouseInputAdapter {
 private Point location;
 private MouseEvent pressed;
 public DragListener() {
 }
 public void mousePressed(final MouseEvent me) {
 pressed = me;
 }
 public void mouseDragged(final MouseEvent me) {
 if (pressed == null) {
 return;
 }
 Component component = me.getComponent();
 location = component.getLocation(location);
 int x = location.x - pressed.getX() + me.getX();
 int y = location.y - pressed.getY() + me.getY();
 component.setLocation(x, y);
 }
}

You can then add this custom Listener to any component like so:

DragListener dragListener = new DragListener();
frame.addMouseListener(dragListener);
frame.addMouseMotionListener(dragListener);

This will detect the MouseEvents on the component it is set to and only drag the component while the left mouse button is being pressed.