//*****************************************************************************
// ColorButtonPanel.java
//
// Summer 1999, 2000
// Geetika Tewari, Victoria Manfredi and Christie Rice
//
//
//*****************************************************************************

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




public class ColorButtonPanel extends Panel implements ActionListener

{
  ColorFrame cf;                      // Parent

  ColorCanvas cc;                     // Components on ColorPanel     
  Button saveButton;                  // 

  int width, height;                  // Dimensions of panel

  GridBagLayout gridbag;              // For layout 
  GridBagConstraints constraints;     // 
  

  //********************************
  //
  //  constructor
  //
  //********************************
  public ColorButtonPanel(ColorFrame cff)
  {
    super();

    cf = cff;
    cc = new ColorCanvas(cf);

    saveButton = new Button("SAVE");
    saveButton.addActionListener(this);
    

    // Make ColorButtonPanel panel take up half of the ColorFrame frame
    height = cf.getSize().height;
    width = cf.getSize().width/2;
    setSize(width, height);


    setBackground(Color.white);



    // Setup gridbag layout
    gridbag = new GridBagLayout();
    constraints = new GridBagConstraints();
    setLayout(gridbag);
    
    buildConstraints(constraints,0,0,3,1,100,100);
    gridbag.setConstraints(cc,constraints);
    add(cc);

    buildConstraints(constraints,1,1,1,1,100,100);
    gridbag.setConstraints(saveButton,constraints);
    add(saveButton);



  }// end constructor



  //****************************
  //
  //  buildConstraints
  //
  //
  // Needed for the gridbag 
  // layout.
  //****************************
  void buildConstraints(GridBagConstraints gbc, int gx, int gy, 
			int gw, int gh, int wx, int wy)
  {
      gbc.gridx = gx;
      gbc.gridy = gy;
      gbc.gridwidth = gw;
      gbc.gridheight = gh;
      gbc.weightx = wx;
      gbc.weighty = wy;

  }// end buildConstraints


  //*******************************
  //
  //  actionPerformed
  //
  //  Needed for the save button.
  //*******************************
  public void actionPerformed (ActionEvent e)
  {

    // Save the current color in the array of user-defined colors  
    cf.UserColor[cf.userIndex] = cf.curc;

    // Call paint in ColorCanvas so that the cf.curc in Color Canvas is
    // updated => ColorCanvas changes => ColorCanvas observers are notified
    cf.cp.cbp.cc.repaint();

    // The array of user-defined colors is a circular array.
    cf.userIndex = (cf.userIndex + 1) % Constants.NUM_USER_COL;


  }// end actionPerformed



}// end class ColorButtonPanel