whiteboardframe.java

远程网络画板,用JAVA RMI实现,远程的多个用户可以同时在同一画板上绘画

package whiteboard;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
import java.util.Vector;
import java.rmi.*;


public class WhiteboardFrame extends JFrame     
 {


	boolean saved = false;
	File savedFile;
   eboard board1;
   CallBack callback1;
   int callbackid;
   String name;
  boolean connected=false;
  String hostname;
  boolean update=false;
   
	// IO
  private ObjectInputStream  input;
  private ObjectOutputStream output; 

  private JButton choices[];         
  private String names[]={
          "New",
          "Open",
          "Save",    

       

          "Pencil",		
          "Line",	
          "Rect",		
          "fRect",		
          "Oval",		
          "fOval",		
          "Circle",		
          "fCircle",	
          "RoundRect",	
          "frRect",		
          "Rubber",	
          "Color",		
          "Stroke",		
          "Word"		
          };

  private String styleNames[]={
             " Times New Roman " , " Serif " , " Monospaced " ,
            " SonsSerif " , " Garamond "
            }; 
	//font style          

  private Icon items[];

	// explaination of icon's function

  private String tipText[]={
                "Draw a new picture",
                "Open a saved picture",
                "Save current drawing",
                "Draw at will",
                "Draw a straight line",
                "Draw a rectangle",
                "Fill a ractangle",
                "Draw an oval",
                "Fill an oval",
                "Draw a circle",
                "Fill a circle",
                "Draw a round rectangle",
                "Fill a round rectangle",
                "Erase at will",
                "Choose current drawing color",
                "Set current drawing stroke",
                "Write down what u want"
              };

  JToolBar buttonPanel ;		       
  private JLabel statusBar;            

  private DrawPanel drawingArea;       
  
  // initial frame size
  private int width=1000,height=800;    

  drawings[] itemLista=new drawings[5000]; 
  drawings anitem=new drawings();
  Vector itemlist;
  int itemtempy1;
  int itemtempx1;
	int pressedtempy1;
	int pressedtempx1;
  private int currentChoice=3;            //set default tool as pen
  int index=0;                         
  private Color color=Color.black;     // set default color as black
  int R,G,B;                           // store RBG color values

  int f1,f2;                  // store font style
  String style1;              // store font style
  private float stroke=1.0f;  // set default stroke size as 1.0f

  JCheckBox bold,italic;      //name od font style
  JComboBox styles;

  public WhiteboardFrame(String hostname,String name)        //constructor
  {
   
   super(name);
   this.name=name;
   this.hostname=hostname;
   JMenuBar bar=new JMenuBar();		
   JMenu fileMenu=new JMenu("File");
   fileMenu.setMnemonic('F');


// new file
   JMenuItem newItem=new JMenuItem("New");
   newItem.setMnemonic('N');
   newItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   newFile();		
                  }
          }
   );
   fileMenu.add(newItem);

	  // save file
   JMenuItem saveItem=new JMenuItem("Save");
   saveItem.setMnemonic('S');
   saveItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   saveFile();		
                  }
          }
   );
   fileMenu.add(saveItem);



// save as file
   JMenuItem saveAsItem=new JMenuItem("Save As");
   saveAsItem.setMnemonic('A');
   saveAsItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   saveAsFile();		
                  }
          }
   );
   fileMenu.add(saveAsItem);

// open file
   JMenuItem loadItem=new JMenuItem("Load");
   loadItem.setMnemonic('L');
   loadItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   loadFile();		
                  }
          }
   );
   fileMenu.add(loadItem);

   fileMenu.addSeparator();

// exit program
   JMenuItem exitItem=new JMenuItem("Exit");
   exitItem.setMnemonic('X');
   exitItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                    WhiteboardFrame.this.windowClosed();	
                  }
          }
   );
   fileMenu.add(exitItem);
   bar.add(fileMenu);

// set color menu
   JMenu colorMenu=new JMenu("Color");
   colorMenu.setMnemonic('C');

// set color item
   JMenuItem colorItem=new JMenuItem("Choose Color");
   colorItem.setMnemonic('O');
   colorItem.addActionListener(
           new ActionListener(){
                   public void actionPerformed(ActionEvent e)
                   {
                    chooseColor();	
                   }
       }
      );
   colorMenu.add(colorItem);
   bar.add(colorMenu);

// set stroke menu
    JMenu strokeMenu=new JMenu("Stroke");
    strokeMenu.setMnemonic('S');

// set stroke item
    JMenuItem strokeItem=new JMenuItem("Set Stroke");
    strokeItem.setMnemonic('K');
    strokeItem.addActionListener(
           new ActionListener(){
                   public void actionPerformed(ActionEvent e)
                    {
                     setStroke();
                     }
                   }
              );
           strokeMenu.add(strokeItem);
           bar.add(strokeMenu);

// set help menu
    JMenu helpMenu=new JMenu("Help");
    helpMenu.setMnemonic('H');

// set about item
    JMenuItem aboutItem=new JMenuItem("About this white board!");
    aboutItem.setMnemonic('A');
    aboutItem.addActionListener(
           new ActionListener(){
                   public void actionPerformed(ActionEvent e)
                    {
                     JOptionPane.showMessageDialog(null,
                        "White board ",
                        " White board ",
                         JOptionPane.INFORMATION_MESSAGE );
                     }
                   }
              );
    helpMenu.add(aboutItem);
    bar.add(helpMenu);

    items=new ImageIcon[names.length];

// set draw function buttons
    drawingArea=new DrawPanel();
    choices=new JButton[names.length];
    buttonPanel = new JToolBar( JToolBar.VERTICAL ) ;
    buttonPanel = new JToolBar( JToolBar.HORIZONTAL) ;
    ButtonHandler handler=new ButtonHandler();
    ButtonHandler1 handler1=new ButtonHandler1();

// import icons
    for(int i=0;i<choices.length;i++)
    {
	
     items[i]=new ImageIcon(names[i] + ".gif");
     choices[i]=new JButton("",items[i]);
     choices[i].setToolTipText(tipText[i]);
     buttonPanel.add(choices[i]);
    }

//add listemer to bottons
    for(int i=3;i<choices.length-3;i++)
    {
     choices[i].addActionListener(handler);
    }

    choices[0].addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   newFile();
                  }
          }
     );

    choices[1].addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   loadFile();
                  }
          }
     );

    choices[2].addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   saveFile();
                  }
          }
     );
    choices[choices.length-3].addActionListener(handler1);
    choices[choices.length-2].addActionListener(handler1);
    choices[choices.length-1].addActionListener(handler1);

// font style
    styles=new JComboBox(styleNames);
    styles.setMaximumRowCount(8);
    styles.addItemListener(
            new ItemListener(){
                    public void itemStateChanged(ItemEvent e)
                    {
                      style1=styleNames[styles.getSelectedIndex()];
                    }
               }
            );
//font style
    bold=new JCheckBox("BOLD");
    italic=new JCheckBox("ITALIC");

    checkBoxHandler cHandler=new checkBoxHandler();
    bold.addItemListener(cHandler);
    italic.addItemListener(cHandler);

    JPanel wordPanel=new JPanel();
    buttonPanel.add(bold);
    buttonPanel.add(italic);
    buttonPanel.add(styles);
    styles.setMinimumSize(  new Dimension ( 50, 20 ) );
    styles.setMaximumSize(new Dimension ( 100, 20 ) );

    Container c=getContentPane();
    super.setJMenuBar( bar );
    c.add(buttonPanel,BorderLayout.NORTH);
    c.add(drawingArea,BorderLayout.CENTER);

    statusBar=new JLabel();
    c.add(statusBar,BorderLayout.SOUTH);
    statusBar.setText("    Distributed white board  :)");

    createNewItem();
    setSize(width,height);

    show();
    
    this.addWindowListener
      (
          new WindowAdapter() {
              public void windowClosing(WindowEvent e) {
                  WhiteboardFrame.this.windowClosed();
              }
          }
      );

		  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");

           // board1=(eboard)Naming.lookup("rmi://"+hostname+":"+"1999"+"/WhiteBoard");
            System.out.println("find remote object");
            callback1=new CallBackServant(this);
            
            //board1.addEraser(eraser);
            System.out.println("add eraser");
            //itemlist=board1.getEraser();
            callbackid=board1.regist(callback1,name);
            
           //                 board1.add(anitem);
            
            System.out.println("initiate call back success");
        }catch(Exception e) {
			System.out.println(" cannot connect");
            System.out.println(e.getMessage());

		//	System.exit(0);
        }
  }
   protected void showWarning(String warning){
	   /*
      JOptionPane window =new  JOptionPane();
      window.showMessageDialog(this,warning,"",JOptionPane.WARNING_MESSAGE);
	    */

	   JDialog dialog = new JDialog(this, "Warning ");

	   //Add contents to it.
	   JLabel label = new JLabel(warning);
	   label.setHorizontalAlignment(JLabel.CENTER);
	   Container contentPane = dialog.getContentPane();
	   contentPane.add(label, BorderLayout.CENTER);

	   //Show it.
	   dialog.setSize(new Dimension(300, 150));
	   dialog.setLocationRelativeTo(this);
	   dialog.setVisible(true);  
   }
    protected void whiteboardupdate()
    {
        update=true;
        try{
            if(board1.getConnectStatus(callbackid)){
    	    itemlist=board1.getall();}
    	    repaint();
            
    	}catch(Exception e){
    		;
    	}
    }

    protected void windowClosed() {
    	
    	// TODO: Check if it is safe to close the application
    	
        // Exit application.
        try
        {

			if (name.compareTo("SERVER") ==0) 
			{
				board1.notifyallwarning("Server has left");
			}

            board1.deregist(callbackid);
            System.out.println("deregist");
        }catch(Exception e)
        {
        	System.out.println("deregist error"+e.getMessage());;
        }
        System.exit(0);
    }
    
// listen to function buttons

public class ButtonHandler implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
   for(int j=3;j<choices.length-3;j++)
   {
      if(e.getSource()==choices[j])
         {currentChoice=j;
          createNewItem();
          repaint();}
        }
    }
 }

// listen to color stroke and text

public class ButtonHandler1 implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
    if(e.getSource()==choices[choices.length-3])
         {chooseColor();}
    if(e.getSource()==choices[choices.length-2])
         {setStroke();}
    if(e.getSource()==choices[choices.length-1])
         {JOptionPane.showMessageDialog(null,
             "Please hit the drawing pad to choose the word input position",
             "Hint",JOptionPane.INFORMATION_MESSAGE );
          currentChoice=14;
          createNewItem();
          repaint();
          }
    }
 }


 class mouseA extends MouseAdapter
 {
   public void mousePressed(MouseEvent e)
    {statusBar.setText("     Mouse Pressed @:[" + e.getX() +
                              ", " + e.getY() + "]");

     itemLista[index].x1=itemLista[index].x2=e.getX();
     itemLista[index].y1=itemLista[index].y2=e.getY();
     anitem.x1=anitem.x2=e.getX();
     anitem.y1=anitem.y2=e.getY();
     itemtempy1=anitem.y1;
     itemtempx1=anitem.x1;


	 pressedtempy1 = anitem.y1;
	 pressedtempx1 = anitem.x1;
    // if pen or eraser selected do following
    if(currentChoice==3||currentChoice==13)
    {
     itemLista[index].x1=itemLista[index].x2=e.getX();
     itemLista[index].y1=itemLista[index].y2=e.getY();
     index++;
     anitem.x1=anitem.x2=e.getX();
     anitem.y1=anitem.y2=e.getY();
     itemtempy1=anitem.y1;
     itemtempx1=anitem.x1;
                 try{