Java：如何注册侦听JFrame运动的侦听器 [英] Java: how to register a listener that listen to a JFrame movement

问题描述

如何跟踪JFrame本身的移动？我想注册一个每次都会被回调的监听器 JFrame.getLocation（）将返回一个新值。

How can you track the movement of a JFrame itself? I'd like to register a listener that would be called back every single time JFrame.getLocation() is going to return a new value.

编辑以下代码显示已接受的答案正在解决我的问题：

EDIT Here's a code showing that the accepted answered is solving my problem:

import javax.swing.*;

public class SO {

    public static void main( String[] args ) throws Exception {
        SwingUtilities.invokeAndWait( new Runnable() {
            public void run() {
                final JFrame jf = new JFrame();
                final JPanel jp = new JPanel();
                final JLabel jl = new JLabel();
                updateText( jf, jl );
                jp.add( jl );
                jf.add( jp );
                jf.pack();
                jf.setVisible( true );
                jf.addComponentListener( new ComponentListener() {
                    public void componentResized( ComponentEvent e ) {}
                    public void componentMoved( ComponentEvent e ) {
                        updateText( jf, jl );
                    }
                    public void componentShown( ComponentEvent e ) {}
                    public void componentHidden( ComponentEvent e ) {}
                } );
            }
        } );
    }

    private static void updateText( final JFrame jf, final JLabel jl ) {
        // this method shall always be called from the EDT
        jl.setText( "JFrame is located at: " + jf.getLocation() );
        jl.repaint();
    }

}

推荐答案

JFrame jf = new JFrame();
jf.addComponentListener(new ComponentListener() {...});

是你想要的。

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