Java - mouseMoved() event handling in Swing

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Solution 1

If you want to receive mouseMoved and mouseDragged events, you need to also register your listener as a MouseMotionListener.

MouseAdapter adapter = ...
JFrame frame = ...
frame.addMouseListener(adapter);
frame.addMouseMotionListener(adapter);

Solution 2

Maybe you should try implementing MouseMotionListener and with MouseListener too ?

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mc.suchecki
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mc.suchecki

Nothing to see here yet, move around.

Updated on July 23, 2022

Comments

  • mc.suchecki
    mc.suchecki almost 2 years

    I want to listen for mouse movements and clicks in my JFrame. To do this, I've added a MouseListener implemented like this: (whole code of View class is at https://gist.github.com/2837224, Board class is at https://gist.github.com/2837231)

    class BattleshipsFrame extends JFrame {
      private final Board playerBoard, opponentBoard;
      private View view;
    
    /** Main window constructor. */
    BattleshipsFrame() {
      ...
      ...   
      ...
      //creating and displaying boards
      playerBoard = new Board();
      opponentBoard = new Board();
      PlayerBoardListener mouseListener = new PlayerBoardListener();
      this.addMouseListener(mouseListener);
      playerBoard.addMouseListener(mouseListener);
      opponentBoard.addMouseListener(new OpponentBoardListener());
      boards.add(playerBoard);
      boards.add(opponentBoard);
      ...
      ...
      ...
    }
    
    /** Listener responsible for handling mouse events on player board */
    private class PlayerBoardListener extends MouseAdapter {
      @Override public void mousePressed(MouseEvent event) {
        try {
          if(event.getButton() == MouseEvent.BUTTON1 && controllerConnection != null)
            controllerConnection.sendShipPlacedEvent(event.getX()/40, event.getY()/40, ShipType.EMPTY);
        } catch(Exception e) {
          e.printStackTrace();
        }
      }   
      @Override public void mouseMoved(MouseEvent event) {
        //TODO
        System.out.println("Mouse movement detected! Actual mouse position is: " + event.getX()+ "," + event.getY() + ".");
      }   
      @Override public void mouseDragged(MouseEvent event) {
        //TODO
        System.out.println("Mouse movement detected! Actual mouse position is: " + event.getX()+ "," + event.getY() + ".");
      }   
    
    }
    

    Funny thing is that mousePressed() is working well, but the other two are not (nothing shows on console while moving the mouse). Anybody could tell me what am I doing wrong? Thanks in advance!