组件坐标

Question

我正在尝试获得与其父级相关的组件坐标.例如,当我有一个JFrame的大小500×500,其中有一个孩子- 的JPanel -在[50,10]我应该得到[50,10]结果.无论看起来多么简单,我一直都会遇到错误的坐标([0,0]或[ 3,24 ]).

这是我的JPanel代码:

class MyPanel extends JPanel implements MouseListener { 
    private Component parent;   
    private String strName;

    public MyPanel(Component pr, String name, int w, int h) {
        super();

        parent = pr;
        strName = new String(name);

        this.setLayout(null);
        this.setSize(w, h);
        this.setBackground(Color.WHITE);
        this.addMouseListener(this);

        this.setVisible(true);
    }

    /* MouseListener implementation */
    public void mouseClicked(MouseEvent event) {
            int x = event.getX(); int y = event.getY();
            Point pnt = new Point(SwingUtilities.convertPoint(this, new Point(0, 0), parent));
            System.out.println(strName + ":" + pnt);    
    }

    public void mouseEntered(MouseEvent event) { }

    public void mouseExited(MouseEvent event) { }

    public void mousePressed(MouseEvent event) { }

    public void mouseReleased(MouseEvent event) { }
}

有任何想法吗？

Java二进制和源代码(*.tar.xz)

Answer 1

试试这个:

Point pnt = new Point(SwingUtilities.convertPoint(this, event.getPoint(), parent));

isnatead of using(在提供的片段中至少没有使用BTW至少):

    int x = event.getX();
    int y = event.getY();

你不应该这样做:

Point pnt = new Point(SwingUtilities.convertPoint(this, new Point(0,0), parent));

否则返回的坐标将始终与(0,0)有关.

你也可以这样做(我认为你会忘记x和y:P):

    int x = event.getX();
    int y = event.getY();
    Point pnt = new Point(SwingUtilities.convertPoint(this,
                                               new Point(x,y), parent));

编辑:

如果我明白你想要什么,那么为什么要烦恼所有的代码呢？在每个JPanelŝ MouseListener的mouseClicked()做到这一点:

public void mouseClicked(MouseEvent event) {
    System.out.println(this.getX()+" "+this.getY());//print x and why co-ords for MyJpanel
}