Question

我一直致力于基本的塔防游戏，并且正在寻找跟踪鼠标的动作。拖动时我不需要它来跟踪鼠标移动，但只是当悬停在屏幕上时，用户可以看到塔的放置位置。我已经扩展了MouseAdapter以制作一个控制器并点击放置一个塔，但我无法想象如何跟踪鼠标移动。应该覆盖mouseMoved吗？我尝试了一点点成功。在发表一个印刷声明之后我可以看到该事件没有被解雇。这就是我目前所拥有的：

public class MouseController extends MouseAdapter {

    private final Board my_board;

    private final int square_size;

    public MouseController(final Board the_board, final int the_square_size) {
        my_board = the_board;
        square_size = square_size;
    }

    @Override
    public void mouseClicked(final MouseEvent e) {
        super.mouseClicked(e);
        Point p = e.getPoint();
        my_board.placeTower(p.x / square_size, p.y / square_size - 1);
    }

    @Override
    public void mouseMoved(final MouseEvent e) {
        super.mouseMoved(e);
        Point p = e.getPoint();
        my_board.placeCursor(p.x / square_size, p.y / square_size - 1);
    }
}

感谢任何帮助。谢谢！

Answer 1

这是一个官方教程，可以完全按照您的要求进行操作：http://docs.oracle.com/javase/tutorial/uiswing/events/mousemotionlistener.html

以下是内联的相关摘录：

public class MouseMotionEventDemo extends JPanel 
                                  implements MouseMotionListener {
    //...in initialization code:
        //Register for mouse events on blankArea and panel.
        blankArea.addMouseMotionListener(this);
        addMouseMotionListener(this);
        ...
    }

    public void mouseMoved(MouseEvent e) {
       saySomething("Mouse moved", e);
    }

    public void mouseDragged(MouseEvent e) {
       saySomething("Mouse dragged", e);
    }

    void saySomething(String eventDescription, MouseEvent e) {
        textArea.append(eventDescription 
                        + " (" + e.getX() + "," + e.getY() + ")"
                        + " detected on "
                        + e.getComponent().getClass().getName()
                        + newline);
    }
}

Answer 2

如何将MouseController添加到代码中？我认为MouseAdaptor实现了MouseListener和MouseMotionListener。请务必同时致电component.addMouseMotionListener(myMouseController)，而不仅仅是component.addMouseListener(myMouseController)。如果仅调用mouseClicked但不调用mouseMoved，则听起来您只是将鼠标控制器添加为鼠标侦听器，但还不是鼠标移动侦听器。

跟踪java中的鼠标移动

2 个答案: