//*****************************************************************************
// ColorTextFieldHandler.java
//
// Summer 2000
//
// Geetika Tewari, Christie Rice & Victoria Manfredi
//
// 
// Used to listen to one of the textboxs. 
//
//*****************************************************************************

import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.io.*;
import java.util.*;


class ColorTextFieldHandler implements TextListener
{

  ColorFrame cf;
  int number, numberPrev;
  String NumStr, prevNumStr;;
  String MinStr, MaxStr;      // Strings for the upper and lower RGB bounds

  int index;                  // Index of the ScrollTextPanel

  //*************************
  //
  //  constructor
  //
  //*************************
  public ColorTextFieldHandler (ColorFrame cff, int i) 
  {
    cf = cff;        
    index = i;

    number = 0;
    numberPrev =0;
    NumStr = new String ("100");      
    prevNumStr = new String ("100");
    MinStr = new String ("0");      // Strings for the upper and lower
    MaxStr = new String ("255");    // RGB bounds


  }// end constructor



  //*************************
  //
  //  textValueChanged
  //
  //*************************
  public void textValueChanged(TextEvent e)
  {
    NumStr = cf.cp.rgbp.STPanel[index].rgbTextField.getText();


    // see whether the user only entered numbers
    try 
    {
      number = Integer.parseInt(cf.cp.rgbp.STPanel[index].rgbTextField.getText());

    }// end try
    catch (NumberFormatException numex)
    {
      // Use the old, valid numbers if an exception is encountered
      number = numberPrev;
      cf.cp.rgbp.STPanel[index].rgbTextField.setText(prevNumStr);

    } // end catch



    // make sure the number is an appropriate number
    if (number < 0)
     {
      number = 0;
      NumStr = MinStr;
      cf.cp.rgbp.STPanel[index].rgbTextField.setText(NumStr);
     }
    if (number > 255)
     {
      number = 255;
      NumStr = MaxStr;
      cf.cp.rgbp.STPanel[index].rgbTextField.setText(NumStr);
     }

    
    //Initialize the appropriate component of the currently selected color
    if(index == 0)
      cf.r = number;
    else if(index == 1)
      cf.g = number;
    else if(index == 2)
      cf.b = number;
    


    if (numberPrev != number)
      {
	// repaint current color box with new color
	cf.curc= new Color(cf.r, cf.g, cf.b);
	cf.cp.cbp.cc.repaint();
      }

    // Get the current values for possible use later
    prevNumStr = NumStr;
    numberPrev = number;

    
  } // end textValueChanged

  
} //end ColorTextFieldHandle