java鼠标点击panel键盘监听失效

先定义一个全局的静态变量 static bool canClick=ture；

1.鼠标右键点击的事件前加个if判断：

if（canClick）{

鼠标点击事件事件

}

2.然后添加键盘事件implements KeyListener

在重写的方法的keyPressed中加入:

if(e.getKeyCode()==KeyEvent.VK_CONTROL){

canClick=false

}

在重新的方法的keyReleased中加入:

if(e.getKeyCode()==KeyEvent.VK_CONTROL){

canClick=true

}

画图不能这样来画的，因为Graphics 不能自己来控制：

DrawLine DW=new DrawLine()

DW.g.setColor(Color.orange)

DW.g.drawLine(orgX, orgY, e.getX(), e.getY())

public void mouseRealeased(MouseEvent e)这个方法你拼错了，应该是：

public void mouseReleased(MouseEvent e)

帮你改了下，实现的功能：安下鼠标不放 -->移动别处 -->松开，画图

import java.awt.Frame

import java.awt.Graphics

import java.awt.Graphics2D

import java.awt.event.MouseAdapter

import java.awt.event.MouseEvent

import java.awt.event.WindowAdapter

import java.awt.event.WindowEvent

import javax.swing.JPanel

public class DrawLine extends Frame {

static JPanel drawPanel

static int orgX

static int orgY

static int eX

static int eY

public static void main(String[] args) {

// TODO 自动生成方法存根

drawPanel = new JPanel() {

@Override

public void paint(Graphics g) {

super.paint(g)

Graphics2D g2D = (Graphics2D) g

g2D.drawLine(orgX, orgY, eX, eY)

}

}

DrawLine mainFrame = new DrawLine()

mainFrame.setSize(400, 400)

mainFrame.setTitle("画线")

mainFrame.add(drawPanel)

mainFrame.setVisible(true)

mainFrame.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

e.getWindow().dispose()

System.exit(0)

}

})

mainFrame.addMouseListener(new MouseAdapter() {

public void mousePressed(MouseEvent e) {

orgX = e.getX()

orgY = e.getY()

}

public void mouseReleased(MouseEvent e) {

System.out.println("mouseReleased")

eX = e.getX()

eY = e.getY()

drawPanel.repaint()

}

})

}

}

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