package class5_1_DuckFactories_v8;

import javax.swing.JFrame;
import java.awt.Color;

/**
 *  This class implements a virtual duck pond as a JFrame 
 *  window that contains JComponent-derived Ducks.
 * @author hornick
 */
public class DuckPond extends JFrame {
	public static final int PONDSIZE=500; // size of the duck pond (width & height)
	private static final long serialVersionUID = 1L; // needed if this class will be serializable
	
	/**
	 * constructor - each call creates a separate TableTop
	 * @param title window title
	 */
	public DuckPond(String title) {
		createUI(title); 	// create the user interface
		setVisible(true);	// make it visible
	}

	/**
	 * main UI JFrame initialization - size, title, layout, etc
	 * @param title window title
	 */
	private void createUI(String title) {
		// create the containing window and set its size etc
		setTitle(title); 

		setSize(PONDSIZE, PONDSIZE); // initial window size
		setResizable(true); // disallow resizing
		getContentPane().setBackground( Color.BLUE );
	
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		// Configure the content pane for absolute layout
		getContentPane().setLayout(null);
	}
	
	/**
	 * Adds a Ball (a type of JComponent) to the JFrame's content pane.
	 * @param d reference to a Ball object to be added to the content pane.
	 * @note JFrames maintain in internal List of JComponent-derived elements,
	 * which are automatically displayed whenever the JFrame needs to refresh
	 * itself. Since Ball is a JComponent, the Ball image is automatically
	 * painted in the window.
	 */
	public void addDuck( Duck d ) {
		getContentPane().add(d); // adds a JComponent to the content pane of this JFrame
		repaint(); // update the JFrame after the new Ball is added
	}
}