/**处理鼠标事件*/import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class A0062 extends JFrame{
public A0062(){
A0062B A62B = new A0062B(); //这个是第2个类创建军对像
getContentPane().setLayout(new BorderLayout());
getContentPane().add(A62B);
}
public static void main(String[] args){
A0062 CD = new A0062();
CD.setTitle("天天");
CD.setDefaultCloseOpeation(JFrame.EXIT_ON_CLOSE);
CD.setSize(200,200);
CD.setVisible(true);
}
}class A0062B extends MessagePanel implements MouseMotionListener{ //MessagePanel 是信息面板类
public A0062B(String s){
super(s);
this.addMouseMotionListener(this);
}
public void mouseMoved(MouseEvent e){
}
public void mousedragged(MouseEvent e){ //事件按下鼠标拖动时
setXCoordinate(e.getX()); // XCoordinate 是信息的X坐标
setYCoordinate(e.getY()); // YCoordinate 是信息的Y坐标
}
}////(MessagePanel 是信息面板类) 我不知道有没有这个类!
import java.awt.event.*;
import javax.swing.*;public class A0062 extends JFrame{
public A0062(){
A0062B A62B = new A0062B(); //这个是第2个类创建军对像
getContentPane().setLayout(new BorderLayout());
getContentPane().add(A62B);
}
public static void main(String[] args){
A0062 CD = new A0062();
CD.setTitle("天天");
CD.setDefaultCloseOpeation(JFrame.EXIT_ON_CLOSE);
CD.setSize(200,200);
CD.setVisible(true);
}
}class A0062B extends MessagePanel implements MouseMotionListener{ //MessagePanel 是信息面板类
public A0062B(String s){
super(s);
this.addMouseMotionListener(this);
}
public void mouseMoved(MouseEvent e){
}
public void mousedragged(MouseEvent e){ //事件按下鼠标拖动时
setXCoordinate(e.getX()); // XCoordinate 是信息的X坐标
setYCoordinate(e.getY()); // YCoordinate 是信息的Y坐标
}
}////(MessagePanel 是信息面板类) 我不知道有没有这个类!
但是打上去没有现显有这个MessagePanel类
我这个代码是有错的!
代码(是拖动鼠标在面板上移动信息!)高手能指点指点!
谢谢!
不难的。
import java.awt.event.*;
import java.util.*;
import java.awt.geom.*;
import javax.swing.*;public class MouseTest
{
public static void main(String[] args)
{
MouseFrame frame = new MouseFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}/**
A frame containing a panel for testing mouse operations
*/
class MouseFrame extends JFrame
{
public MouseFrame()
{
setTitle("MouseTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); // add panel to frame MousePanel panel = new MousePanel();
add(panel);
} public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 200;
}/**
A panel with mouse operations for adding and removing squares.
*/
class MousePanel extends JPanel
{
public MousePanel()
{
squares = new ArrayList<Rectangle2D>();
current = null; addMouseListener(new MouseHandler());
addMouseMotionListener(new MouseMotionHandler());
} public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g; // draw all squares
for (Rectangle2D r : squares)
g2.draw(r);
} /**
Finds the first square containing a point.
@param p a point
@return the first square that contains p
*/
public Rectangle2D find(Point2D p)
{
for (Rectangle2D r : squares)
{
if (r.contains(p)) return r;
}
return null;
} /**
Adds a square to the collection.
@param p the center of the square
*/
public void add(Point2D p)
{
double x = p.getX();
double y = p.getY(); current = new Rectangle2D.Double(
x - SIDELENGTH / 2,
y - SIDELENGTH / 2,
SIDELENGTH,
SIDELENGTH);
squares.add(current);
repaint();
} /**
Removes a square from the collection.
@param s the square to remove
*/
public void remove(Rectangle2D s)
{
if (s == null) return;
if (s == current) current = null;
squares.remove(s);
repaint();
}
private static final int SIDELENGTH = 10;
private ArrayList<Rectangle2D> squares;
private Rectangle2D current;
// the square containing the mouse cursor private class MouseHandler extends MouseAdapter
{
public void mousePressed(MouseEvent event)
{
// add a new square if the cursor isn't inside a square
current = find(event.getPoint());
if (current == null)
add(event.getPoint());
} public void mouseClicked(MouseEvent event)
{
// remove the current square if double clicked
current = find(event.getPoint());
if (current != null && event.getClickCount() >= 2)
remove(current);
}
} private class MouseMotionHandler
implements MouseMotionListener
{
public void mouseMoved(MouseEvent event)
{
// set the mouse cursor to cross hairs if it is inside
// a rectangle if (find(event.getPoint()) == null)
setCursor(Cursor.getDefaultCursor());
else
setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
} public void mouseDragged(MouseEvent event)
{
if (current != null)
{
int x = event.getX();
int y = event.getY(); // drag the current rectangle to center it at (x, y)
current.setFrame(
x - SIDELENGTH / 2,
y - SIDELENGTH / 2,
SIDELENGTH,
SIDELENGTH);
repaint();
}
}
}
}
粘了个鼠标事件的代码,楼主可以好好看看