t_editor.java

保存和打开

++window_counter;
++window_no;

st=Integer.toString(window_no);

Frame_class f=new Frame_class("<< Text Editor 1.0>> By << Anuj Agrawal >> : New Window  "+st);

f.setSize(700,600);
}

private void newWindow(){
fileName=null;
tx1.setText("");
tx1.requestFocus();} 

private boolean lentest(){

s=tx1.getText();
int len=s.length();
if(len>0)return (true);else return(false);}

private void closedFile(){

if(lentest()){
 saveOpenedFile();
 newWindow();String ar;
 if(window_no>=1){ar="New Window  "+st+" : ";}else ar="";
 this.setTitle("<< Text Editor 1.0>> By << Anuj Agrawal >>  : "+ar+"*.*");


 }
else newWindow();}

  
  
 /* public  void keyPressed(KeyEvent ke){

  int key=ke.getKeyCode();

  switch(key){
  case KeyEvent.VK_F1:openFile();break;
  }

  }*/
//////////////////////////////////////////////////////////////////////////////// 
 
// public void keyReleased(KeyEvent ke){}
// public void keyTyped(KeyEvent ke){}
 
 // The Dialog boxes for openinig and saving file
 private void AddDialog(){
 
 openDialog =new FileDialog (this,"Open File",FileDialog.LOAD);
 saveDialog=new FileDialog (this,"Save File",FileDialog.SAVE);
 }
 
 
 //cuts selected textand places it on the buffer 
 
 
 public void cut(){
 copystring =tx1.getSelectedText();
 tx1.replaceText("",tx1.getSelectionStart(),tx1.getSelectionEnd());
 tx1.requestFocus();
 }
 
 //copies selected text to buffer
 
 public void copy(){
 
 copystring=tx1.getSelectedText();
 tx1.requestFocus();
 }
 
 
 //paste text from buffer to the screen
 public void paste(){
 
 if(copystring.length()>0)
 tx1.insertText(copystring,tx1.getSelectionStart());
 tx1.requestFocus();
 }
 
 private void openFile(){
 String filename;
 
 openDialog.setVisible(true);
 
 filename=openDialog.getFile();
 if(filename!=null){
  filename=check(filename);
  if(read(filename)) 
  {
  fileName=filename;String ar;
  if(window_no>=1){ar="New Window  "+st+" : ";}else ar="";
  this.setTitle("<< Text Editor 1.0>> By << Anuj Agrawal >> : "+ar+fileName);
  }
  }
  tx1.requestFocus();
  }
 
 
private boolean read(String filename){


String line;
FileInputStream in = null;
DataInputStream dataIn =null;
BufferedInputStream bis=null;
StringBuffer buffer=new StringBuffer();

try{
 in =new FileInputStream(filename);
 bis=new BufferedInputStream(in);
 dataIn=new DataInputStream(bis);
 }
 catch(Throwable e){
   showErrorDialog("Can't open\""+filename+"\"");
   return (false);
  }
  
  try{
   while((line=dataIn.readLine())!=null){
   buffer.append(line+"\n");
   }
   
  in.close();
  tx1.setText(buffer.toString());
  }catch(IOException e){
  showErrorDialog("Can't read \""+filename+"\"");
  return(false);
  }
  return(true);
  } 
 
 private String check(String filename){
 if(filename.endsWith(".*.*")){
 filename=filename.substring(0,filename.length()-4);
 }
 return(filename);
 }
 
//method saves a file you opened previously
  //method produces error if you did not open a file previously
  
  public void saveOpenedFile()  { 
  
    if(!lentest()) showErrorDialog("There is no  <<Text>>  to Save");else
    if(fileName==null)  {
    saveAsFile(this);
    //showErrorDialog("You did not previously open a file.Use save as.");
    }  else {
     write(fileName);
     tx1.requestFocus();
    }
   }  

//methods save as the file you are currently editing
private void saveAsFile(Frame_class f1){
 if(!lentest()) showErrorDialog("There is no <<Text>> to Save");else
 {
 String filename;
 saveDialog.setVisible(true);
 filename=saveDialog.getFile();
 
 if(filename!=null){
  filename=check(filename);
 if(write(filename)) 
 {
  fileName=filename;
  f1.setTitle("<< Text Editor 1.0>> By << Anuj Agrawal >> : "+heading+" : "+fileName+"                    "+st);
  
  }
   }
   
   tx1.requestFocus();
 }                 
                    
    }
   
   
//method handles writing files to the file system
private boolean write (String filename){


 FileOutputStream os=null;
 
 try{
  
    os=new FileOutputStream(filename);
    }catch(Throwable e){
    showErrorDialog("Can't write\""+filename+"\"");
    return(false);
    }
    
    try{
    
    String s=tx1.getText();
    int len=s.length();
    for(int i=0;i<len;i++){
     os.write(s.charAt(i));
     }
     
     os.close();
     }
     catch(IOException e){
     showErrorDialog("can't write\""+filename+"\"");
     return(false);
     }
     return(true);
     }
     
    



 //DialogBoxes.......
 public void showErrorDialog(String message){
 if(errorDialog!=null)errorDialog.dispose();
 errorDialog=new ErrorDialog(this,message);
 errorDialog.setVisible(true);
 }
 public void showTEDialog(String message){
 if(teDialog!=null)teDialog.dispose();
 teDialog=new TEDialog(this,message);
 teDialog.setVisible(true);
 }
 }//close brace of Frame_class
////////////////////////////////////////////////////////////////////////////////
class ErrorDialog extends Dialog{
Frame_class parent;
String message;
public ErrorDialog(Frame_class parent,String message){
super(parent,"Error",true);
setBackground(Color.yellow);
this.parent=parent;
this.message=message;

Panel p;

p=new Panel();
p.add(new Label(message));
p.setFont(new Font("System",Font.BOLD,12));
add("Center",p);

Dimension d;
d=parent.size();
reshape(200,50,420,100);
setResizable(false);
}

public boolean handleEvent(Event event){

switch(event.id){
case Event.WINDOW_DESTROY:
dispose();
parent.tx1.requestFocus();
return(true);
}
return(false);
}
}
class TEDialog extends Dialog{
Frame_class parent;
String message;
public TEDialog(Frame_class parent,String message){
super(parent,"TextEditor 1.0",true);
setBackground(Color.yellow);
this.parent=parent;
this.message=message;

TextArea p;

p=new TextArea();
p.setText(message);
p.setFont(new Font("System",Font.BOLD,12));
add("Center",p);
p.setEditable(false);
Dimension d;
d=parent.size();
reshape(200,50,500,300);
//setResizable(false);
}

public boolean handleEvent(Event event){

switch(event.id){
case Event.WINDOW_DESTROY:
dispose();
parent.tx1.requestFocus();
return(true);
}
return(false);
}
}




/////////////////////////////////////////////////////////////////////////////////
class MyWindowAdapter extends WindowAdapter{// MyWindowAdapter class 
        Frame_class fc1;
 
  
  public MyWindowAdapter(Frame_class fc1){
  this.fc1=fc1;
 
  
  }
  
  public void windowClosing(WindowEvent we){
  
  if(Frame_class.window_counter==0) 
  System.exit(0);
  else
  fc1.setVisible(false);
  -- Frame_class.window_counter;
    }
  
}//end MyWindowAdapter class
////////////////////////////////////////////////////////////////////////////////


/////////////////////////////////////////////////////////////////////////////////
//main() function class 
/////////////////////////////////////////////////////////////////////////////////

 class T_Editor {  //open brace of T_Editor class


public static void main(String args[]){ //open brace of main() fun.

Frame f1=new Frame_class("<< Text Editor 1.0>> By << Anuj Agrawal >>");
//f1.setVisible(true);


Dimension d;
d=Toolkit.getDefaultToolkit().getScreenSize();
f1.setSize(d.width,d.height);
}//close brace of main() fun.

}//close brace of T_Editor class

/////////////////////////////////////////////////////////////////////////////////