Fixed LogPanel to support new log data model

src/dev/kske/chess/board/Log.java

@@ -1,8 +1,10 @@
 package dev.kske.chess.board;
 
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.List;
 
+import dev.kske.chess.board.Log.MoveNode;
 import dev.kske.chess.board.Piece.Color;
 
 /**
@@ -11,7 +13,7 @@ import dev.kske.chess.board.Piece.Color;
  * Created: <strong>09.07.2019</strong><br>
  * Author: <strong>Kai S. K. Engelbart</strong>
  */
-public class Log {
+public class Log implements Iterable<MoveNode> {
 
 	private MoveNode root, current;
 
@@ -46,6 +48,28 @@ public class Log {
 		}
 	}
 
+	@Override
+	public Iterator<MoveNode> iterator() {
+		return new Iterator<MoveNode>() {
+
+			private MoveNode	current	= root;
+			private boolean		hasNext	= true;
+
+			@Override
+			public boolean hasNext() {
+				return hasNext;
+			}
+
+			@Override
+			public MoveNode next() {
+				MoveNode result = current;
+				if (current.hasVariations()) current = current.variations.get(0);
+				else hasNext = false;
+				return result;
+			}
+		};
+	}
+
 	/**
 	 * Adds a move to the move history and adjusts the log to the new position.
 	 * 
@@ -75,18 +99,19 @@ public class Log {
 	 * move.
 	 */
 	public void removeLast() {
-		if (!isEmpty() && current.parent != null) {
+		if (hasParent()) {
 			current.parent.variations.remove(current);
 			current = current.parent;
-			activeColor		= current.activeColor;
-			enPassant		= current.enPassant;
-			fullmoveCounter	= current.fullmoveCounter;
-			halfmoveClock	= current.halfmoveClock;
+			update();
 		} else reset();
 	}
 
 	public boolean isEmpty() { return root == null; }
 
+	public boolean hasParent() {
+		return !isEmpty() && current.parent != null;
+	}
+
 	/**
 	 * Reverts the log to its initial state corresponding to the default board
 	 * position.
@@ -100,6 +125,44 @@ public class Log {
 		halfmoveClock	= 0;
 	}
 
+	/**
+	 * 
+	 * @param index
+	 */
+	public void selectNextNode(int index) {
+		if (!isEmpty() && current.variations != null && index < current.variations.size()) {
+			current = current.variations.get(index);
+			update();
+		}
+	}
+
+	/**
+	 * Selects the parent of the current {@link MoveNode} as the current node.
+	 */
+	public void selectPreviousNode() {
+		if (hasParent()) {
+			current = current.parent;
+			update();
+		}
+	}
+
+	/**
+	 * Selects the root {@link MoveNode} as the current node.
+	 */
+	public void selectRootNode() {
+		if (!isEmpty()) {
+			current = root;
+			update();
+		}
+	}
+
+	private void update() {
+		activeColor		= current.activeColor;
+		enPassant		= current.enPassant;
+		fullmoveCounter	= current.fullmoveCounter;
+		halfmoveClock	= current.halfmoveClock;
+	}
+
 	/**
 	 * @return The first logged move, or {@code null} if there is none
 	 */
@@ -196,5 +259,9 @@ public class Log {
 		 * @return A list of all variations associated with this {@link MoveNode}
 		 */
 		public List<MoveNode> getVariations() { return variations; }
+
+		public boolean hasVariations() {
+			return variations != null && variations.size() > 0;
+		}
 	}
 }

src/dev/kske/chess/game/Game.java

@@ -80,8 +80,6 @@ public class Game {
 			// Run garbage collection
 			System.gc();
 
-			System.out.printf("%s: %s%n", player.color, move);
-			System.out.println("FEN: " + board.toFEN());
 			EventBus.getInstance().dispatch(new MoveEvent(move));
 			GameState eventType = board.getGameEventType(board.getDest(move).getColor().opposite());
 			switch (eventType) {

src/dev/kske/chess/ui/GamePane.java

@@ -28,6 +28,10 @@ public class GamePane extends JComponent {
 	private LogPanel	logPanel;
 	private Game		game;
 	private Color		activeColor;
+	private JPanel		moveSelectionPanel;
+	private JButton		btnNext;
+	private JButton		btnFirst;
+	private JButton		btnLast;
 
 	public GamePane() {
 		activeColor = Color.WHITE;
@@ -35,8 +39,8 @@ public class GamePane extends JComponent {
 		GridBagLayout gridBagLayout = new GridBagLayout();
 		gridBagLayout.columnWidths	= new int[] { 450, 1, 0 };
 		gridBagLayout.rowHeights	= new int[] { 33, 267, 1, 0 };
-		gridBagLayout.columnWeights	= new double[] { 0.0, 0.0, Double.MIN_VALUE };
-		gridBagLayout.rowWeights	= new double[] { 0.0, 0.0, 0.0, Double.MIN_VALUE };
+		gridBagLayout.columnWeights	= new double[] { 0.0, 1.0, Double.MIN_VALUE };
+		gridBagLayout.rowWeights	= new double[] { 1.0, 0.0, 0.0, Double.MIN_VALUE };
 		setLayout(gridBagLayout);
 
 		JPanel toolPanel = new JPanel();
@@ -58,7 +62,31 @@ public class GamePane extends JComponent {
 		gbc_toolPanel.fill		= GridBagConstraints.HORIZONTAL;
 		gbc_toolPanel.gridx		= 0;
 		gbc_toolPanel.gridy		= 0;
+		gbc_toolPanel.gridwidth	= 2;
 		add(toolPanel, gbc_toolPanel);
+
+		moveSelectionPanel = new JPanel();
+		GridBagConstraints gbc_moveSelectionPanel = new GridBagConstraints();
+		gbc_moveSelectionPanel.fill		= GridBagConstraints.BOTH;
+		gbc_moveSelectionPanel.gridx	= 2;
+		gbc_moveSelectionPanel.gridy	= 0;
+		add(moveSelectionPanel, gbc_moveSelectionPanel);
+
+		btnFirst = new JButton("First");
+		btnFirst.setEnabled(false);
+		moveSelectionPanel.add(btnFirst);
+
+		JButton btnPreviousMove = new JButton("Previous");
+		btnPreviousMove.setEnabled(false);
+		moveSelectionPanel.add(btnPreviousMove);
+
+		btnNext = new JButton("Next");
+		btnNext.setEnabled(false);
+		moveSelectionPanel.add(btnNext);
+
+		btnLast = new JButton("Last");
+		btnLast.setEnabled(false);
+		moveSelectionPanel.add(btnLast);
 		boardPane = new BoardPane();
 		GridBagConstraints gbc_boardPane = new GridBagConstraints();
 		gbc_boardPane.fill	= GridBagConstraints.BOTH;
@@ -97,6 +125,7 @@ public class GamePane extends JComponent {
 		gbc_logPanel.fill		= GridBagConstraints.VERTICAL;
 		gbc_logPanel.gridx		= 2;
 		gbc_logPanel.gridy		= 1;
+		gbc_logPanel.gridheight	= 2;
 		add(logPanel, gbc_logPanel);
 	}
 

src/dev/kske/chess/ui/LogPanel.java

@@ -1,10 +1,9 @@
 package dev.kske.chess.ui;
 
 import java.awt.BorderLayout;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
-import java.util.List;
+import java.util.Iterator;
 import java.util.Set;
 
 import javax.swing.JPanel;
@@ -53,18 +52,17 @@ public class LogPanel extends JPanel implements Subscribable {
 		return new HashSet<>(Arrays.asList(MoveEvent.class));
 	}
 
+	// TODO: Implement support for variation selection
 	@Override
 	public void handle(Event<?> event) {
-		if (log == null) return;
-
-		// TODO: Display log with variations
-		final List<MoveNode>	moves	= /* log.getLoggedMoves() */ new ArrayList<>();
-		String[][]				data	= new String[moves.size() / 2 + moves.size() % 2][2];
-		for (int i = 0; i < data.length; i++) {
-			data[i][0] = moves.get(i * 2).move.toSAN();
-			if (i * 2 + 1 < moves.size()) data[i][1] = moves.get(i * 2 + 1).move.toSAN();
+		if (log == null || log.isEmpty()) return;
+		final DefaultTableModel model = new DefaultTableModel(new String[] { "White", "Black" }, 0);
+		for (Iterator<MoveNode> iter = log.iterator(); iter.hasNext();) {
+			String[] row = new String[] { iter.next().move.toSAN(), "" };
+			if (iter.hasNext()) row[1] = iter.next().move.toSAN();
+			model.addRow(row);
 		}
-		mtable.setModel(new DefaultTableModel(data, new String[] { "White", "Black" }));
+		mtable.setModel(model);
 	}
 
 	public Log getLog() { return log; }