/** Copyright by Barry G. Becker, 2000-2011. Licensed under MIT License: http://www.opensource.org/licenses/MIT */
package com.barrybecker4.game.twoplayer.common.ui;
import com.barrybecker4.game.common.Move;
import com.barrybecker4.game.twoplayer.common.TwoPlayerController;
import com.barrybecker4.game.twoplayer.common.TwoPlayerMove;
import java.util.List;
/**
* Helps to play back a sequence of moves on the board.
*
* @author Barry Becker
*/
class MoveSequencePlayback {
/** Piece transparency for moves that have not been played yet. */
private static final short FUTURE_MOVE_TRANSP = 190;
private TwoPlayerController controller_;
/**
* Construct the viewer.
*/
public MoveSequencePlayback(TwoPlayerController controller) {
controller_ = controller;
}
/**
* perform a sequence of moves from somewhere in the game;
* not necessarily the start. We do, however,
* assume the moves are valid. It is for display purposes only.
*
* @param moveSequence the list of moves to make
* @param numMovesToBackup number of moves to undo before playing this move sequence
*/
public void makeMoveSequence( List moveSequence,
int numMovesToBackup ) {
if ( moveSequence == null || moveSequence.size() == 0 ){
return;
}
Move firstMove = (Move) moveSequence.get( 0 );
// the first time we click on a row in the tree, the controller has no moves.
Move lastMove = controller_.getLastMove();
if ( lastMove == null ) {
controller_.reset(); // was AbsTwoPlayerBoardViewer.reset()
}
else {
backupNMoves(moveSequence, numMovesToBackup, firstMove);
}
performMoveSequence(moveSequence);
}
/**
* We keep the original moves and just back up to firstMove.moveNumber.
* number of steps to backup is # of most recent real moves minus
* the first move in the sequence.
*/
private void backupNMoves(List moveSequence, int numMovesToBackup, Move firstMove) {
int ct = 0;
if (firstMove != null ) {
while ( ct < numMovesToBackup ) {
controller_.undoLastMove();
// I suppose this is possible
if (controller_.getLastMove() == null) {
throw new IllegalArgumentException("Reached the end after backing up "
+ ct + " out of " + numMovesToBackup + " steps." +
"\n moveSequence=" + moveSequence);
}
ct++;
}
}
}
/**
* Perform the specified sequence of moves.
* @param moveSequence the sequence of consecutive moves to play on the board.
*/
private synchronized void performMoveSequence(List moveSequence) {
int firstFuture = 0;
for ( int i = 0; i < moveSequence.size(); i++ ) {
TwoPlayerMove m = (TwoPlayerMove) moveSequence.get( i );
if (m.isFuture()) {
if (firstFuture == 0) {
firstFuture = i;
}
m.getPiece().setAnnotation(Integer.toString(i - firstFuture + 1));
m.getPiece().setTransparency(FUTURE_MOVE_TRANSP);
}
controller_.makeMove(m);
}
}
}