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package cz.xelfi.quoridor.visidor;

import cz.xelfi.quoridor.Board;

import cz.xelfi.quoridor.Move;

import java.awt.GridLayout;

import java.util.List;

import java.util.concurrent.CopyOnWriteArrayList;

import javax.swing.JPanel;

/** JavaBean class that displays and can manipulate with Quoridor {@link Board}.

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

public final class BoardPane extends JPanel {

    private final Viewer viewer;

    private final List<BoardListener> listeners = new CopyOnWriteArrayList<BoardListener>();

    public BoardPane() {

        setLayout(new GridLayout(1,1));

        viewer = new Viewer();

        viewer.moveListener(this);

        add(viewer);

    }

    public final void setBoard(Board b) {

        viewer.setBoard(b);

    }

    public final Board getBoard() {

        return viewer.getBoard();

    }

    /** The board can either be in <q>view only</q> mode when showing state 

     * of the {@link Board} during opponent's move, or it can be editable.

     * In editable mode, one shall listen on changes delivered to 

     * BoardListener.

     * 

     * @param editable read only or editable mode?

     */

    public final void setEditable(boolean editable) {

        viewer.enableListeners(editable);

    }

    public final void addBoardListener(BoardListener l) {

        listeners.add(l);

    }

    public final void removeBoardListener(BoardListener l) {

        listeners.remove(l);

    }

    final void moveHappened(Move m) {

        BoardEvent ev = null;

        for (BoardListener bl : listeners) {

            if (ev == null) {

                ev = new BoardEvent(this, m);

            }

            bl.boardChanged(ev);

        }

    }

}