swing的一段代码，貌似是焦点的有关问题，求指教
日期：2014-05-20 浏览次数：20805 次
swing的一段代码，貌似是焦点的问题，求指教
------解决方案--------------------
三个checkbox占据了整个frame而他们是不会响应你的mouseevent的
加一个panel在第一行，然后2 3 行中进行操作
代码稍微改了下可以运行
- Java code
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class DrawPic extends JFrame implements MouseListener,MouseMotionListener{
int x1,x2,y1,y2;
boolean line,circle,rect;
static CheckboxGroup cbg ;
DrawPic(){
addMouseListener(this);
x1 = 0;
x2 = 0;
y1 = 0;
y2 = 0;
line = false;
circle = false;
rect = false;
}
public void go(){
setLayout(new GridLayout(3,1));
cbg = new CheckboxGroup();
add(new Checkbox("line",cbg,true));
add(new Checkbox("rect",cbg,false));
add(new Checkbox("circle",cbg,false));
}
public static void main(String args[]){
DrawPic draw = new DrawPic();
draw.setSize(400,300);
//draw.go();
draw.setVisible(true);
}
public void mouseClicked(MouseEvent e){
System.out.println("Mouse Clicked");
}
public void mouseReleased(MouseEvent e){
x2 = e.getX();
y2 = e.getY();
/*if(cbg.getSelectedCheckbox().getLabel().equals("line"))
line = true;
else if(cbg.getSelectedCheckbox().getLabel().equals("rect"))
rect = true;
else if(cbg.getSelectedCheckbox().getLabel().equals("circle"))
circle = true;*/
repaint();
line = false;
circle = false;
rect = false;
}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mousePressed(MouseEvent e){
x1 = e.getX();
y1 = e.getY();
}
public void mouseDragged(MouseEvent e){
}
public void mouseMoved(MouseEvent e){}
public void paint(Graphics g){
System.out.println("painting..");
line = true;
g = this.getContentPane().getGraphics();
if(line)
g.drawLine(x1,y1,x2,y2);
else if(circle)
g.drawOval(x1,y1,x2-x1,y2-y1);
else if(rect)
g.drawRect(x1,y1,x2-x1,y2-y1);
}
}
------解决方案--------------------
三个checkbox占据了整个frame而他们是不会响应你的mouseevent的
加一个panel在第一行，然后2 3 行中进行操作
代码稍微改了下可以运行
- Java code
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package test;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class DrawPic extends JFrame implements MouseListener,MouseMotionListener{
int x1,x2,y1,y2;
boolean line,circle,rect;
static CheckboxGroup cbg ;
DrawPic(){
addMouseListener(this);
x1 = 0;
x2 = 0;
y1 = 0;
y2 = 0;
line = false;
circle = false;
rect = false;
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
}
public void go(){
setLayout(new GridLayout(3,1));
JPanel pnl = new JPanel();
add(pnl);
cbg = new CheckboxGroup();
pnl.add(new Checkbox("line",cbg,true));
pnl.add(new Checkbox("rect",cbg,false));
pnl.add(new Checkbox("circle",cbg,false));
}
public static void main(String args[]){
DrawPic draw = new DrawPic();
draw.setSize(400,300);
draw.go();
draw.setVisible(true);
}
public void mouseClicked(MouseEvent e){
System.out.println("Mouse Clicked");
}
public void mouseReleased(MouseEvent e){
x2 = e.getX();
y2 = e.getY();
line = false;
circle = false;
rect = false;
if(cbg.getSelectedCheckbox().getLabel().equals("line"))
line = true;
else if(cbg.getSelectedCheckbox().getLabel().equals("rect"))
rect = true;
else if(cbg.getSelectedCheckbox().getLabel().equals("circle"))
circle = true;
repaint();
}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mousePressed(MouseEvent e){
x1 = e.getX();
y1 = e.getY();
}
public void mouseDragged(MouseEvent e){
}
public void mouseMoved(MouseEvent e){}
public void paint(Graphics g){
System.out.println("painting..");
//line = true;
g = this.getContentPane().getGraphics();
if(line)
g.drawLine(x1,y1,x2,y2);
else if(circle)
g.drawOval(x1,y1,x2-x1,y2-y1);
else if(rect)
g.drawRect(x1,y1,x2-x1,y2-y1);
else{
g.drawLine(x1,y1,x2,y2);
}
}
}
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