Java MouseEvent事件

在任何事件都可以使用鼠标事件,当发生相关的事件是MouseEvent类自动一个事件对象

addMouseListener(MouseListener listener)//注册鼠标事件监视器

使用MouseListener 接口处理鼠标事件

MouseEvent中几个重要的方法

getX()//获取鼠标指针在事件源坐标系中的x坐标
getY()//获取鼠标指针在事件源坐标系中的y坐标
getButton()//获取鼠标的左键(BUTTON1)或中键(BUTTON2)或右键(BUTTON3)/填到括号里的常量
getClickCount()//获取鼠标被点击的次数
getSource()//获取发生鼠标事件的事件源

MouseListener接口中几个重要方法

mousePressed(MouseEvent)//当鼠标被按下时
mouseReleased(MouseEvent)//当鼠标被释放时
mouseEntered(MouseEvent)//当鼠标进入组件时
mouseExited(MouseEvent)//当鼠标离开组件时
mouseClicked(MouseEvent)//当鼠标被点击时

MouseMotionListener接口处理鼠标事件

鼠标事件的第二个接口

mouseDragged(MouseEvent)//当鼠标被拖动时
mouseMoved(MouseEvent)//当鼠标被移动时

使用坐标实现组件的拖动例子
首先一个实现MouseListener和MouseMotionListener接口的分层窗格的子类

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;public class LP extends JLayeredPane implements MouseListener, MouseMotionListener {    //分层窗格子类LP实现了两个接口JButton jButton,jButton2;int x,y,a,b,x0,y0;LP(){setLayout(new FlowLayout());    //设置一个流体布局jButton = new JButton("用鼠标拖动我");jButton2 = new JButton("用鼠标拖动我2");jButton.addMouseListener(this); //用LP自己做监视器jButton2.addMouseListener(this); //用LP自己做监视器jButton.addMouseMotionListener(this); //用LP自己做监视器jButton2.addMouseMotionListener(this); //用LP自己做监视器add(jButton,JLayeredPane.DEFAULT_LAYER);//将按钮添加到分层窗格的默认层add(jButton2,JLayeredPane.DEFAULT_LAYER);//将按钮添加到分层窗格的默认层}@Overridepublic void mouseClicked(MouseEvent mouseEvent) {}@Overridepublic void mousePressed(MouseEvent mouseEvent) {   //当鼠标点击时JComponent com = null;com = (JComponent)mouseEvent.getSource();//获取鼠标的当前对象//setLayout(com,JLayeredPane.DRAG_LAYER);a = com.getBounds().x;b = com.getBounds().y;x0 = mouseEvent.getX(); //获取鼠标在事件源中的位置坐标y0 = mouseEvent.getY();}@Overridepublic void mouseReleased(MouseEvent mouseEvent) {JComponent com = null;com = (JComponent)mouseEvent.getSource();////setLayout(com,JLayeredPane.DEFAULT_LAYER);}@Overridepublic void mouseEntered(MouseEvent mouseEvent) {}@Overridepublic void mouseExited(MouseEvent mouseEvent) {}@Overridepublic void mouseDragged(MouseEvent mouseEvent) {Component com = null;if (mouseEvent.getSource()instanceof Component){com = (Component)mouseEvent.getSource();a = com.getBounds().x;b = com.getBounds().y;x = mouseEvent.getX();  //获取鼠标源的位置y = mouseEvent.getY();a = a + x;b = b + y;com.setLocation(a-x0,b-y0);}}@Overridepublic void mouseMoved(MouseEvent mouseEvent) {}
}

然后再写一个JFrame的子类

import javax.swing.*;
import java.awt.*;public class myWindow extends JFrame {LP layeredPane; //分层窗格的子类LP 类型变量myWindow(){setTitle("实现组件的拖动");setBounds(300,300,400,400);Container con = this.getContentPane();con.setBackground(new Color(0x366728));layeredPane = new LP(); //将分层窗格实例化add(layeredPane, BorderLayout.CENTER);//window默认布局设置为中心setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setVisible(true);//validate();}
}

最后进行测试

public class Example10_11 {public static void main(String[] args) {myWindow myWindow = new myWindow();}
}

最后的效果图(随便拖动)

注:本篇文章写的比较仓促还有很多注意地方未改进和未提出,接下来会进一步修改

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