import javax.swing.*;
import java.awt.*;

/**
 * Class that holds a digital picture and displays it.
 * 
 * Copyright Georgia Institute of Technology 2004
 * @author Barb Ericson ericson@cc.gatech.edu
 */
public class PictureFrame
{
  
  ////////////////// fields ////////////////////////////
  
  /**
   * Main window used as the frame
   */
  JFrame frame = new JFrame();
  
  /**
   * ImageIcon used to display the picture in the label
   */
  ImageIcon imageIcon = new ImageIcon();
  
  /**
   * Label used to display the picture
   */
  private JLabel label = new JLabel(imageIcon);
  
  /**
   * Digital Picture to display
   */
  private DigitalPicture picture;
  
  ///////////////// constructors ////////////////////////
  
  /**
   * A constructor that takes no arguments.  This is needed
   * for subclasses of this class
   */
  public PictureFrame()
  {
    // set up the frame
    initFrame();
  }
  
  /**
   * A constructor that takes a picture to display
   * @param picture  the digital picture to display in the picture frame
   */
  public PictureFrame(DigitalPicture picture)
  {
    // set the current object's picture to the passed in picture
    this.picture = picture;
    
    // set up the frame
    initFrame();
  }
  
  ///////////////////////// methods ////////////////////////////////////
  
  /**
   * Method to set the picture to show in this picture frame
   * @param picture the new picture to use
   */
  public void setPicture(Picture picture)
  {
    this.picture = picture;
    imageIcon.setImage(picture.getImage());
    frame.pack();
    frame.repaint();
  }
  
  /**
   * A method to update the picture frame image with the image in the 
   * picture 
   */
  public void updateImage()
  {
    // only do this if there is a picture
    if (picture != null)
    {
      // set the image for the image icon from the picture
      imageIcon.setImage(picture.getImage());
      
      // set the title of the frame to the title of the picture
      frame.setTitle(picture.getTitle());
      
    }
  }
  
  /**
   * A method to update the picture frame image with the image in the picture
   * and show it
   */
  public void updateImageAndShowIt()
  {
    // first update the image
    updateImage();
    
    // now make sure it is shown
    frame.setVisible(true);
  }
  
  /**
   * A method to make sure the frame is displayed
   */
  public void displayImage()
  {
    frame.setVisible(true);
  }
  
  /**
   * Method to set the title for the picture frame
   * @param title the title to use
   */
  public void setTitle(String title)
  { 
    frame.setTitle(title);
  }
  
  /**
   * Method to force the picture frame to repaint (redraw)
   */
  public void repaint()
  {
    
    // make it visible
    frame.setVisible(true);
    
    // update the image from the picture
    updateImage();
    
    // tell the JFrame to handle the repaint
    frame.repaint();
  }
  
  /**
   * Close the window
   */
  public void close() {
   frame.dispose(); 
  }
  
  /**
   * A method to initialize the picture frame
   */
  private void initFrame()
  {
    
    // set the image for the picture frame
    updateImage();
      
    // add the label to the frame
    frame.getContentPane().add(label);
    
    // pack the frame (set the size to as big as it needs to be)
    frame.pack();
    
    // make the frame visible
    frame.setVisible(true);
  }
  
}