java用鼠标移动组件

Question

我试图通过简单地添加鼠标监听器和使用setLocation函数来使任何组件可拖动java.awt.Component.我开始JButton测试是否有可能按照我的想法.

这是我想要做的代码示例:

import java.awt.*;
import javax.swing.*;

public class DragButton extends JButton{

private volatile int draggedAtX, draggedAtY;

public DragButton(String text){
    super(text);
    setDoubleBuffered(false);
    setMargin(new Insets(0, 0, 0, 0));
    setSize(25, 25);
    setPreferredSize(new Dimension(25, 25));

    addMouseListener(new MouseAdapter(){
        public void mousePressed(MouseEvent e){
            draggedAtX = e.getX() - getLocation().x;
            draggedAtY = e.getY() - getLocation().y;
        }
    });

    addMouseMotionListener(new MouseMotionAdapter(){
        public void mouseDragged(MouseEvent e){
            setLocation(e.getX() - draggedAtX, e.getY() - draggedAtY);
        }
    });
}

public static void main(String[] args){
    JFrame frame = new JFrame("DragButton");
    frame.setLayout(null);
    frame.getContentPane().add(new DragButton("1"));
    frame.getContentPane().add(new DragButton("2"));
    frame.getContentPane().add(new DragButton("3"));
    frame.setSize(300, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    }
}

不知何故,这无法正常工作,我不明白为什么.拖动的实际距离是鼠标移动距离的一半,并且在拖动时它会在该距离周围闪烁,就好像两个鼠标位置在比赛中一样MouseMotionListener.

愿任何人帮助挥杆/击球杆吗？=)非常感谢提前.

编辑:

好的,所以问题是我不知道事件会在每个鼠标位置重新启动,其位置是相对(!)到射击JComponent.所以这是纠正和工作的代码:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class DragButton extends JButton{

    private volatile int draggedAtX, draggedAtY;

    public DragButton(String text){
        super(text);
        setDoubleBuffered(false);
        setMargin(new Insets(0, 0, 0, 0));
        setSize(25, 25);
        setPreferredSize(new Dimension(25, 25));

        addMouseListener(new MouseAdapter(){
            public void mousePressed(MouseEvent e){
                draggedAtX = e.getX();
                draggedAtY = e.getY();
            }
        });

        addMouseMotionListener(new MouseMotionAdapter(){
            public void mouseDragged(MouseEvent e){
                setLocation(e.getX() - draggedAtX + getLocation().x,
                        e.getY() - draggedAtY + getLocation().y);
            }
        });
    }

    public static void main(String[] args){
        JFrame frame = new JFrame("DragButton");
        frame.setLayout(null);
        frame.getContentPane().add(new DragButton("1"));
        frame.getContentPane().add(new DragButton("2"));
        frame.getContentPane().add(new DragButton("3"));
        frame.setSize(300, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

感谢Adel的努力和mKorbel的链接.

Answer 1

你必须搬走JComponent,我在空洞中错过了这个定义mousePressed/mouseDragged; 另一方面,作为ComponentMover的@[camickr][1]优秀代码,没有什么比这更好的了.

Answer 2

import javax.swing.*;
import java.awt.event.*;    

public class movingButton extends JFrame{

    private JButton button ;

    public movingButton ()
    {
     super("Position helper");
       super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       super.setSize(500,520);
       super.setVisible(true);
       super.setLayout(null);
       button = new JButton ("drag me ");
       add(button);
       button.setBounds(100, 100, 150, 40);         
       button.addMouseMotionListener(new MouseAdapter(){

            public void mouseDragged(MouseEvent E)
            {
               int X=E.getX()+button.getX();
               int Y=E.getY()+button.getY;
               button.setBounds(X,Y,150,40);
            }
        });
    }

    public static void main (String x[])
    {           
        new movingButton();
    }
}