java - 停止鼠标移动

Question

我想知道如何阻止 mousedMoved 被解雇。我一直在谷歌搜索但找不到答案。有没有办法呢？我正在使用 Eclipse 并通过了 mouseevent 方法，但找不到任何东西。

    public class Drawing extends JPanel {

private ArrayList<Point> pointList;
private int counter = 0;

public Drawing() {
    setLayout(new FlowLayout());
    setBackground(Color.white);

    pointList = new ArrayList<Point>();
    addMouseListener(new MouseTrackerListener());


}

public void paintComponent(Graphics pen) {
    super.paintComponent(pen);


    for (int i = 0; i < pointList.size(); i++) {
        Point p = pointList.get(i);
        pen.fillOval(p.x, p.y, 10, 10);
    }

}

private class MouseTrackerListener extends MouseInputAdapter {
    public void mouseClicked(MouseEvent e) {

        counter++;
        if (counter % 2 != 0) {
            addMouseMotionListener(new MouseTrackerListener());


        } else {
            System.out.println("Hi");
        }

    }

    public void mouseMoved(MouseEvent e) {

        Point point = e.getPoint();
        pointList.add(point);

        repaint();

    }
}

Answer 1

您可以创建一个 boolean 值来切换它是否处于绘图状态。您将 boolean 命名为 isDrawingMode

所以当你点击鼠标时..你把它设置为 false，如果你再次点击它，它就会变成 true；

您所要做的就是在单击鼠标时切换boolean isDrawingMode

所以你的mousemoved监听器看起来像这样

public void mouseMoved(MouseEvent e) {

        if (!isDrawingMode) return; //if isDrawingMode is false, it will not trigger to draw
        Point point = e.getPoint();
        pointList.add(point);

        repaint();

}