//*****************************************************************************
// ColorRGBPanel.java
//
// 15/3/00
// Geetika Tewari, Christie Rice & Victoria Manfredi
//
//
//*****************************************************************************

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

public class ColorRGBPanel extends Panel implements ColorCanvasObserver  
{
  ColorFrame cf;                           // Parent
  ColorButtonPanel cbp;          
  int width, height;                       // Dimensions of panel

  ColorScrollTextPanel  STPanel[];

  Label redL, greenL, blueL;
  Scrollbar redSB, greenSB, blueSB;
  TextField redTF, greenTF, blueTF;
  
  String strR, strG, strB;                // Used with TextFields
  ColorTextFieldHandler TFHandlerR, TFHandlerG, TFHandlerB;


  Color redC, greenC, blueC; // Passed to ScrollTextPanel to set the background



  //********************************
  //
  //  constructor
  //
  //********************************
  public ColorRGBPanel(ColorFrame cff, ColorButtonPanel cbpp)
  {
    
    super();
    
    cf = cff;
    cbp = cbpp;


    // Constructing red, blue, and green labels
    redL = new Label ("Red  ");
    greenL = new Label ("Green");
    blueL = new Label ("Blue ");


    // Creating red, blue, and green scrollbars
    redSB = new Scrollbar(Scrollbar.HORIZONTAL,0,1,0,255);
    greenSB = new Scrollbar(Scrollbar.HORIZONTAL,0,1,0,255);
    blueSB = new Scrollbar(Scrollbar.HORIZONTAL,0,1,0,255);


    // Initializing red, blue, and green textfields
    strR = "" + cf.curc.getRed();
    redTF =  new TextField (strR,3);
    TFHandlerR = new ColorTextFieldHandler(cf,0);

    strG = "" + cf.curc.getGreen();
    greenTF = new TextField (strG,3);
    TFHandlerG = new ColorTextFieldHandler(cf,1);

    strB = "" + cf.curc.getBlue();
    blueTF = new TextField (strB,3);
    TFHandlerB = new ColorTextFieldHandler(cf,2);




    redC = new Color(255,0,0);
    greenC = new Color(0,255,0);
    blueC = new Color(0,0,255);

    STPanel = new ColorScrollTextPanel[Constants.NUM_ST_PANELS];
    STPanel[0]= new ColorScrollTextPanel(cf, redL, redSB, redTF, redC, 0,
					 TFHandlerR);
    STPanel[1]= new ColorScrollTextPanel(cf, greenL, greenSB, greenTF, greenC,
					 1, TFHandlerG);
    STPanel[2]= new ColorScrollTextPanel(cf, blueL, blueSB, blueTF, blueC, 2,
					 TFHandlerB);
    


    height = cf.getSize().height;
    width = cf.getSize().width/2;
    setSize(width,height);

    setBackground(Color.yellow);


    // Setting up the RGBPanel panel
    setLayout(new GridLayout(3,1,0,0));
    add(STPanel[0]);
    add(STPanel[1]);
    add(STPanel[2]);


    cbp.cc.registerAsObserver(this); // Register RGBPanel as an 
                                     // observer of ColorCanvas

  }// end constructor 
  


  //***************************
  //
  //  ColorCanvasHasChanged
  //
  //**************************
  public void ColorCanvasHasChanged(ColorCanvas cc)
  {

    redSB.setValue(cf.curc.getRed());
    greenSB.setValue(cf.curc.getGreen());
    blueSB.setValue(cf.curc.getBlue());

    // get RGB values of current color and make them into strings
    strR = "" + cf.curc.getRed();
    strG = "" + cf.curc.getGreen();
    strB = "" + cf.curc.getBlue();

    // clear textfields then put in new RGB string into textfield
    redTF.setText("");
    redTF.setText(strR);
    greenTF.setText("");
    greenTF.setText(strG);
    blueTF.setText("");
    blueTF.setText(strB);

  }// end ColorCanvasHasChanged


}//end class ColorRGBPanel