whiteboardframe.java

基于java rmi的白板

package whiteboard;

import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import java.rmi.*;

/**
 * Sample application using Frame.
 *
 * @author 
 * @version 1.00 04/12/14
 */
public class WhiteboardFrame extends Frame {
    
    /**
     * The constructor.
     */  
     Panel p1;
     CheckboxGroup cg;
     Checkbox c1;
     Checkbox c2;
     Checkbox c3;
     Checkbox c4;
     Button   b1;
     
     eboard board1;
     CallBack callback1;
     int callbackid;
     
     mainframe_mouseAdapter ada1=new mainframe_mouseAdapter(this);
     mainframe_mouseMotionAdapter ada2=new mainframe_mouseMotionAdapter(this);
     
     public WhiteboardFrame(String hostname) {
                
        //this.setLayout(new FlowLayout());
                
        MenuBar menuBar = new MenuBar();
        Menu menuFile = new Menu();
        MenuItem menuFileExit = new MenuItem();
        
        menuFile.setLabel("File");
        menuFileExit.setLabel("Exit");
        
        // Add action listener.for the menu button
        menuFileExit.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    WhiteboardFrame.this.windowClosed();
                }
            }
        ); 
        menuFile.add(menuFileExit);
        menuBar.add(menuFile);
        
        setTitle("Whiteboard");
        setMenuBar(menuBar);
        setSize(new Dimension(600, 400));
        
        // Add window listener.
        this.addWindowListener
        (
            new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    WhiteboardFrame.this.windowClosed();
                }
            }
        ); 
        
        cg=new CheckboxGroup();
        c1=new Checkbox("pen",cg,true);
        c2=new Checkbox("line",cg,false);
        c3=new Checkbox("rect",cg,false);
        c4=new Checkbox("circle",cg,false);
        
        b1=new Button("clear");
        b1.addMouseListener(new button1_mouseAdapter(this));
        p1=new Panel();        
        
        p1.add(c1);
        p1.add(c2);
        p1.add(c3);
        p1.add(c4);
        p1.add(b1);
        this.add(p1,BorderLayout.NORTH);
        

        this.addMouseListener(ada1);
        this.addMouseMotionListener(ada2); 



        if(System.getSecurityManager() == null)
        {
            System.setSecurityManager(new RMISecurityManager());
        } 
        else 
            System.out.println("Already has a security manager, so cant set RMI SM");
        
        try{
            //board1=new eboardServant();
            board1=(eboard)Naming.lookup("rmi://"+hostname+"/WhiteBoard");
            System.out.println("find remote object");
            callback1=new CallBackServant(this);
            callbackid=board1.regist(callback1);
            System.out.println("initiate call back success");
        }catch(Exception e) {
            System.out.println(e.getMessage());
        }        
        //callback1=new CallBackServant();
    }
    
    protected void whiteboardupdate()
    {
        try{
    	    Vector shapelist=board1.getall();
    	
    	 
    	    for(int i=0;i<shapelist.size();i++)
    	    {
    		    shape ashape=(shape)shapelist.elementAt(i);
    		    ashape.draw(this.getGraphics());
    	    }
    	    
    	}catch(Exception e){
    		;
    	}
    }
    
    
    /**
     * Shutdown procedure when run as an application.
     */
    protected void windowClosed() {
    	
    	// TODO: Check if it is safe to close the application
    	
        // Exit application.
        try
        {
            board1.deregist(callbackid);
            System.out.println("deregist");
        }catch(Exception e)
        {
        	System.out.println("deregist error"+e.getMessage());;
        }
        System.exit(0);
    }
    

	public void paint(Graphics g)
	{
        whiteboardupdate();
	}
    
}


class mainframe_mouseAdapter extends java.awt.event.MouseAdapter
{
    WhiteboardFrame frame;
    
    Point startP;
    Point endP;
    
	public mainframe_mouseAdapter(WhiteboardFrame f)
	{
	    frame=f;
	}
	
    public void mousePressed(MouseEvent e)
	{
		frame.ada2.P=e.getPoint();
	    startP=e.getPoint();
    }
    
    public void mouseReleased(MouseEvent e)
    {
    	shape ashape;
    	endP=e.getPoint();
    	
    	Checkbox selectedc=frame.cg.getSelectedCheckbox();
    	if(selectedc!=frame.c1)
    	{
    	
      	    if(selectedc==frame.c2)
    	    {
    	        ashape=new line(startP,endP);	
    	    }
    	    else if(selectedc==frame.c3)
    	    {
    		    ashape=new rect(startP,endP);
    	    }
    	    else if(selectedc==frame.c4)
    	    {
    	        ashape=new circle(startP,endP);	
    	    }
    	    else
    	    {
    		    ashape=new circle(startP,endP);
    	    }
    	
            try{
                frame.board1.add(ashape);
                System.out.println("ok");
            }catch(Exception ev) {
                System.out.println("Lookup: " + ev.getMessage());
            }
        }        
    	
    	//ashape.draw(frame.getGraphics());
    }
}

class button1_mouseAdapter extends java.awt.event.MouseAdapter
{
	WhiteboardFrame frame;
	public button1_mouseAdapter(WhiteboardFrame f)
	{
	    frame=f;
	}
	
	public void mouseClicked(MouseEvent e)
	{
        try{
            frame.board1.clear();
            System.out.println("clear");
            //frame.update(frame.getGraphics());
        }catch(Exception ev) {
            System.out.println("Lookup: " + ev.getMessage());
        }        		
	}
}


class mainframe_mouseMotionAdapter extends java.awt.event.MouseMotionAdapter
{
    WhiteboardFrame frame;
    
    Point P;
    
	public mainframe_mouseMotionAdapter(WhiteboardFrame f)
	{
	    frame=f;
	}
	
    public void mouseDragged(MouseEvent e)
	{
		Point currentP;
		currentP=e.getPoint();
		Checkbox selectedc=frame.cg.getSelectedCheckbox();
		if(selectedc==frame.c1)
		{
		    shape ashape=new line(P,currentP);
            try{
                frame.board1.add(ashape);
                System.out.println("ok");
            }catch(Exception ev) {
                System.out.println("Lookup: " + ev.getMessage());
            }		    	
		}
	        //frame.getGraphics().drawLine((int)P.getX(),(int)P.getY(),(int)currentP.getX(),(int)currentP.getY());
        P=currentP;
    }
    

}