java-支持鼠标拖动面板
package otherexample;
import java.awt.Color;
import java.awt.Container;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class PanelMove
{
public static JFrame frm=new JFrame();
public static void main(String[] args)
{
frm.setTitle("鼠标拖动面板");
frm.setLayout(null);
MyPanel mp=new MyPanel();
frm.add(mp);
frm.setSize(500,500);
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setVisible(true);
}
}
class Product extends JPanel
{
JLabel pName=null;
JLabel pNumber=null;
JTextField tName=null;
JTextField tNumber=null;
public Product()
{
pName=new JLabel("名称:");
pNumber=new JLabel("数量:");
tName=new JTextField(3);
tNumber=new JTextField(3);
add(pName);
add(tName);
add(pNumber);
add(tNumber);
setBackground(Color.magenta);
}
}
class MyPanel extends JPanel
{
int focusx=0;//下面要做的是实现拖拉功能,设定焦点坐标
int focusy=0;
JLabel lab1=null;
JLabel lab2=null;
public MyPanel()
{
//在java中，标签可以用htnl的属性，但是不都是，比如你不可以设置左右滚动的字体
lab1=new JLabel("<html><font color=white>zhan</font></html>");
add(lab1);
lab2=new JLabel("<html><font color=white>深圳</font></html>");
add(lab2);
setBackground(Color.red);
setBorder(BorderFactory.createRaisedBevelBorder());//使面板有边框，突出显示
//下面四行都是进行拖动处理
setBounds(new Rectangle(80,80,80,100));//要进行拖拉处理，将其设为长方体
addMouseListener(new MouseProcess(){}); //加入监听器
addMouseMotionListener(new MouseMotionProcess());
setLocale(java.util.Locale.getDefault());
}
//以下做的是面板移动处理内部类
private class MouseProcess extends MouseAdapter
{
public void mouseClicked(MouseEvent e)
{
}
public void mousePressed(MouseEvent e)
{
focusx=e.getX(); //将鼠标的坐标赋予焦点X
focusy=e.getY(); //将鼠标的坐标赋予焦点Y
}
}
private class MouseMotionProcess extends MouseMotionAdapter
{
public void mouseDragged(MouseEvent e) //拖动时发生的事件
{
Container container=MyPanel.this.getParent();
int w=container.getWidth();
int h=container.getHeight();
int x=MyPanel.this.getX()+e.getX()-focusx;
int y=MyPanel.this.getY()+e.getY()-focusy;
if(x+MyPanel.this.getWidth()>w) x=w-MyPanel.this.getWidth();
if(y+MyPanel.this.getHeight()>h) y=h-MyPanel.this.getHeight();
if(x<0) x=0;
if(y<0) y=0;
MyPanel.this.setLocation(x,y);
}
}
}
