////////////////////////////
//                        //
//  popUp.class           //
//                        //
//  Handles the pop-up    //
//  dialog boxes for the  //
//  javaCalc applet.      //
//                        //
//  CPS406 Fall '98       //
//                        //
//  Matthew Narrell       //
//                        //
////////////////////////////



import java.awt.*;
import java.awt.event.*;



public class popUp{

  

  /////////////////////////////////////////////////////////////////////////////
  //
  //  Dialog Titles, and Error Messages.
  //
  /////////////////////////////////////////////////////////////////////////////

  protected static String error = "ERROR:";
  
  protected static String warning = "WARNING:";
  
  protected static String divByZero = "Division by ZERO";
  
  protected static String intDiv = "This calculator implements INTEGER division";
  
  protected static String overFlow = "OVERFLOW: Maximum of 20 digits allowed";
  

  /////////////////////////////////////////////////////////////////////////////
  //
  //  Error Methods.
  //
  //  Each of these methods creates a frame and a dialog box, then displays
  //  it to the screen, for specific errors.
  //
  /////////////////////////////////////////////////////////////////////////////

  //  Division by Zero Error
  public static void divByZero(){
    Frame f = new Frame(error);
    dialogbox d = new dialogbox(f, (error + " Division by Zero"), divByZero);
    d.show();
  }

  //  Integer Division Warning  
  public static void intDiv(){
    Frame f = new Frame(warning);
    dialogbox d = new dialogbox(f, (warning + " Integer Division"), intDiv);
    d.show();
  }
  
  //  Overflow Error
  public static void overFlow(){
    Frame f = new Frame(error);
    dialogbox d = new dialogbox(f, (error + " Overflow"), overFlow);
    d.show();
  }
  
  public static void credits(){
    Frame f = new Frame("Credits");
    dialogbox d = new dialogbox(f, "Credits", "Matthew Narrell ");
    d.show();
    
  }
  
}


///////////////////////////////////////////////////////////////////////////////
//
//  Private class to handle dialog box, and "OK" button.
//
///////////////////////////////////////////////////////////////////////////////

class dialogbox extends Dialog implements ActionListener{
  
  
  
  protected Button ok;
  
  protected Label display;
  
  
  public dialogbox(Frame parent, String title, String message){
    
    //Call to parent class to create frame.
    super(parent, title, false);
    
    this.setLayout(new BorderLayout(15,15));
    
    //Set the label to be the passed error message.
    display = new Label(message);
    display.setAlignment(1);
    this.add(display, BorderLayout.CENTER);
    
    //Create the "OK" button.
    ok = new Button("OK");
    ok.addActionListener(this);
    
    Panel p = new Panel();
    p.setLayout(new FlowLayout(FlowLayout.CENTER, 15, 15));
    p.add(ok);
    this.add("South", p);
    
    this.pack();
    
  }
  
  
  public void actionPerformed(ActionEvent e){
    
    //Close dialog box upon clicking "OK".
    setVisible(false);
    
  }
  
  
  
}



class CloseWindow extends WindowAdapter{
  
  
  
  public void windowClosing(WindowEvent e){
    
    e.getWindow().setVisible(false);
    
  }
  
  
  
}