DroidFish: Made it possible to click on moves in the move list to navigate to the corresponding position in the game. Idea from Scid on the go.

DroidFish/src/org/petero/droidfish/DroidFish.java

@@ -74,7 +74,11 @@ import android.text.Html;
 import android.text.Layout;
 import android.text.Spannable;
 import android.text.SpannableStringBuilder;
+import android.text.Spanned;
+import android.text.TextPaint;
+import android.text.method.LinkMovementMethod;
 import android.text.style.BackgroundColorSpan;
+import android.text.style.ClickableSpan;
 import android.text.style.LeadingMarginSpan;
 import android.text.style.StyleSpan;
 import android.util.TypedValue;
@@ -101,7 +105,6 @@ public class DroidFish extends Activity implements GUIInterface {
     // FIXME!!! book.txt (and test classes) should not be included in apk
 
     // FIXME!!! PGN view option: game continuation (for training)
-    // FIXME!!! Command to go to next/previous move in PGN export order.
     // FIXME!!! Remove invalid playerActions in PGN import (should be done in verifyChildren)
     // FIXME!!! Implement bookmark mechanism for positions in pgn files
 
@@ -303,6 +306,7 @@ public class DroidFish extends Activity implements GUIInterface {
         status.setFocusable(false);
         moveListScroll.setFocusable(false);
         moveList.setFocusable(false);
+        moveList.setMovementMethod(LinkMovementMethod.getInstance());
         thinking.setFocusable(false);
 
         cb = (ChessBoard)findViewById(R.id.chessboard);
@@ -1889,6 +1893,22 @@ public class DroidFish extends Activity implements GUIInterface {
 
         boolean pendingNewLine = false;
 
+        /** Makes moves in the move list clickable. */
+        private final static class MoveLink extends ClickableSpan {
+            private Node node;
+            MoveLink(Node n) {
+                node = n;
+            }
+            @Override
+            public void onClick(View widget) {
+                if (ctrl != null)
+                    ctrl.goNode(node);
+            }
+            @Override
+            public void updateDrawState(TextPaint ds) {
+            }
+        }
+
         public void processToken(Node node, int type, String token) {
             if (    (prevType == PgnToken.RIGHT_BRACKET) &&
                     (type != PgnToken.LEFT_BRACKET))  {
@@ -1950,6 +1970,7 @@ public class DroidFish extends Activity implements GUIInterface {
                 sb.append(token);
                 int l1 = sb.length();
                 nodeToCharPos.put(node, new NodeInfo(l0, l1));
+                sb.setSpan(new MoveLink(node), l0, l1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                 if (endPos < l0) endPos = l0;
                 col0 = false;
                 if (nestLevel == 0) paraBold = true;

DroidFish/src/org/petero/droidfish/gamelogic/DroidChessController.java

@@ -377,7 +377,7 @@ public class DroidChessController {
             } else {
                 // Don't undo first white move if playing black vs computer,
                 // because that would cause computer to immediately make
-                // a new move and the whole redo history will be lost.
+                // a new move.
                 if (gameMode.playerWhite() || gameMode.playerBlack()) {
                     game.redoMove();
                     return false;
@@ -427,6 +427,26 @@ public class DroidChessController {
         }
     }
 
+    public final void goNode(Node node) {
+        if (node == null)
+            return;
+        ss.searchResultWanted = false;
+        stopAnalysis();
+        stopComputerThinking();
+        game.goNode(node);
+        ponderMove = null;
+        if (!humansTurn()) {
+            if (game.getLastMove() != null) {
+                game.undoMove();
+                if (!humansTurn())
+                    game.redoMove();
+            }
+        }
+        updateComputeThreads(true);
+        setSelection();
+        updateGUI();
+    }
+
     public final int numVariations() {
         return game.numVariations();
     }

DroidFish/src/org/petero/droidfish/gamelogic/Game.java

@@ -323,6 +323,12 @@ public class Game {
         }
     }
 
+    public final void goNode(Node node) {
+        tree.goNode(node);
+        pendingDrawOffer = false;
+        updateTimeControl(true);
+    }
+
     public final void newGame() {
         tree = new GameTree(gameTextListener);
         if (computerPlayer != null)

DroidFish/src/org/petero/droidfish/gamelogic/GameTree.java

@@ -571,7 +571,7 @@ public class GameTree {
                 dos.writeUTF(tagPairs.get(i).tagValue);
             }
             Node.writeToStream(dos, rootNode);
-            List<Integer> pathFromRoot = currentNode.getPathFromRoot();
+            ArrayList<Integer> pathFromRoot = currentNode.getPathFromRoot();
             int pathLen = pathFromRoot.size();
             dos.writeInt(pathLen);
             for (int i = 0; i < pathLen; i++)
@@ -654,6 +654,15 @@ public class GameTree {
         }
     }
 
+    /** Go to given node in game tree. */
+    public final void goNode(Node node) {
+        ArrayList<Integer> path = node.getPathFromRoot();
+        while (currentNode != rootNode)
+            goBack();
+        for (Integer c : path)
+            goForward(c);
+    }
+
     /** List of possible continuation moves. */
     public final List<Move> variations() {
         if (currentNode.verifyChildren(currentPos))
@@ -985,11 +994,19 @@ public class GameTree {
             return anyToRemove;
         }
 
-        final List<Integer> getPathFromRoot() {
-            List<Integer> ret = new ArrayList<Integer>(64);
+        final ArrayList<Integer> getPathFromRoot() {
+            ArrayList<Integer> ret = new ArrayList<Integer>(64);
             Node node = this;
             while (node.parent != null) {
-                ret.add(node.parent.defaultChild);
+                Node p = node.parent;
+                int childNo = -1;
+                for (int i = 0; i < p.children.size(); i++)
+                    if (p.children.get(i) == node) {
+                        childNo = i;
+                        break;
+                    }
+                if (childNo == -1) throw new RuntimeException();
+                ret.add(childNo);
                 node = node.parent;
             }
             Collections.reverse(ret);