add click-to-move feature

css/chess.css

@@ -240,6 +240,11 @@ button:disabled .silhouette {
    user-select: none;
 }
 
+.cb-piece.cb-selected {
+   filter: drop-shadow(0 0 5px blue);
+   -webkit-filter: drop-shadow(0 0 5px blue);
+}
+
 #cb_board .cb-piece.ui-draggable {
    cursor: grab;
 }

js/pacosako.js

@@ -339,6 +339,14 @@ class Game {
       return JSON.parse(JSON.stringify(this._redo));
    }
 
+   canCapture(side, from) {
+      if (from === PHANTOM) {
+         return true;
+      } else {
+         return this._board.getPiece(otherSide(side), from) === EMPTY;
+      }
+   }
+
    legalMoves(side, from, canCapture) {
       const board = this._board;
       const type = board.getPiece(side, from);
@@ -347,6 +355,10 @@ class Game {
          return [];
       }
 
+      if (canCapture === undefined) {
+         canCapture = this.canCapture(side, from);
+      }
+
       if (from === PHANTOM) {
          /* this is valid because board.getPiece(side, PHANTOM) !== EMPTY */
          from = board.phantom.from;

js/pacosako_ui.js

@@ -57,31 +57,76 @@ $(function (){
       }
    }
 
-   function pieceStartDrag(ev, ui) {
+   function squareClickDestination(ev, ui) {
-      const dragged = $(this);
+      let selected = $('#cb_board .cb-selected');
-      const side = dragged.data('side');
+      if (selected.length !== 1) {
-      const type = dragged.data('type');
+         renderBoard();
-      const from = dragged.data('location');
+         return;
-      const board = currentGame.board;
+      }
-      const where = (from === PS.PHANTOM) ? board.phantom.from : from;
+
-      const canCapture = (from === PS.PHANTOM) ||
+      let from = selected.data('location');
-         board.getPiece(PS.Util.otherSide(side), where) === PS.EMPTY;
+      let to = this.id.replace(/^cb_/, '');
-      const legals = currentGame.legalMoves(side, from, canCapture);
+      selected.appendTo('#cb_hidden');
+
+      try {
+         const meta = { timestamp: new Date(Gun.state()).getTime() };
+         currentGame.move(from, to, meta);
+      } catch (err) {
+         debug('unable to move', err);
+      }
+
+      $('#cb_board').data('last_state', currentGame.moves);
+      setCurrentBoard(currentGame);
+      putState();
+   }
+
+   function pieceStartMove(piece, event) {
+      const side = piece.data('side');
+      const type = piece.data('type');
+      const from = piece.data('location');
+      const legals = currentGame.legalMoves(side, from);
       for (const there of legals) {
-         cbSquare(there).addClass('cb-legal').droppable('enable');
+         const square = cbSquare(there);
+         square.addClass('cb-legal')
+         if (event === 'drag') {
+            square.droppable('enable');
+         } else if (event === 'click') {
+            square.on('click.destination', squareClickDestination);
+         }
       }
    }
 
+   function pieceClickUnselect(ev, ui) {
+      renderBoard();
+   }
+
+   function pieceClickSelect(ev, ui) {
+      const clicked = $(this);
+      clicked.addClass('cb-selected');
+      $('#cb_board .cb-piece').off('click.select');
+      clicked.on('click.unselect', pieceClickUnselect);
+      pieceStartMove(clicked, 'click');
+   }
+
+   function pieceStartDrag(ev, ui) {
+      $('#cb_board .cb-selected').removeClass('cb-selected');
+      $('#cb_board .cb-square').off('click.destination');
+      pieceStartMove($(this), 'drag');
+   }
+
    function pieceStopDrag(ev, ui) {
-      $('#cb_board .cb-legal').removeClass('cb-legal').droppable('disable');
+      renderBoard();
    }
 
    function placePiece(where, side, type, suffix) {
       const code = pieceCode(side, type);
       const piece_id = 'cb_piece_' + code + '_' + suffix;
       const piece = $($('#' + piece_id)[0] || $('#cb_piece_' + code + ' img').clone());
-      piece.attr('style', '');
       piece.attr('id', piece_id);
+      piece.removeClass('cb-selected');
+      piece.removeAttr('style');
+      piece.off('click.select');
+      piece.off('click.unselect');
       piece.data({ side: side, type: type, location: where });
       piece.appendTo(cbSquare(where));
       piece.draggable({
@@ -96,8 +141,11 @@ $(function (){
    }
 
    function renderBoard() {
-      $('#cb_board .cb-piece .ui-draggable').draggable('destroy');
+      $('#cb_board .cb-piece').off('click.select');
-      $('#cb_board .cb-piece').attr('style', '').appendTo('#cb_hidden');
+      $('#cb_board .cb-piece').off('click.unselect');
+      $('#cb_board .cb-square').off('click.destination');
+      $('#cb_board .cb-piece.cb-selected').removeClass('cb-selected');
+      $('#cb_board .cb-piece').removeAttr('style').appendTo('#cb_hidden');
       $('#cb_board .cb-start').removeClass('cb-start');
       $('#cb_board .cb-end').removeClass('cb-end');
       $('#cb_board .cb-legal').removeClass('cb-legal');
@@ -122,17 +170,6 @@ $(function (){
          }
       }
 
-      let clss = game.player === PS.LIGHT ? '.cb-lt-piece' : '.cb-dk-piece';
-
-      if (board.phantom) {
-         let where = board.phantom.from;
-         placePiece(PS.PHANTOM, board.phantom.side, board.phantom.type, 'ph');
-         cbSquare(PS.PHANTOM).appendTo(cbSquare(where));
-         $('#cb_phantom .ui-draggable-disabled').filter(clss).draggable('enable');
-      } else if (game.status === PS.PLAYING) {
-         $('#cb_board .ui-draggable-disabled').filter(clss).draggable('enable');
-      }
-
       const lastMove = game.lastMove;
       if (lastMove) {
          if (lastMove.from) {
@@ -144,6 +181,26 @@ $(function (){
          }
       }
 
+      const liveView = !game.canRedo;
+      const playing = game.status === PS.PLAYING;
+
+      /* only enable selection / drag-and-drop in the live view */
+      if (liveView && playing) {
+         const phantom = board.phantom;
+         if (phantom) {
+            const piece = placePiece(PS.PHANTOM, phantom.side, phantom.type, 'ph');
+            cbSquare(PS.PHANTOM).appendTo(cbSquare(phantom.from));
+            piece.draggable('enable');
+            piece.addClass('cb-selected');
+            pieceStartMove(piece, 'click');
+         } else if (game.status === PS.PLAYING) {
+            const clss = game.player === PS.LIGHT ? '.cb-lt-piece' : '.cb-dk-piece';
+            const pieces = $('#cb_board ' + clss)
+            pieces.on('click.select', pieceClickSelect);
+            pieces.draggable('enable');
+         }
+      }
+
       let msg = '';
       let winner = game.winner;
       if (winner) {
@@ -151,7 +208,7 @@ $(function (){
             msg += (lastMove.side === PS.LIGHT ? 'Light' : 'Dark') + ' player resigned. ';
          }
          msg += (winner === PS.LIGHT ? 'Light' : 'Dark') + ' player won!';
-      } else if (game.status === PS.PLAYING) {
+      } else if (playing) {
          msg += (game.player === PS.LIGHT ? 'Light' : 'Dark') + ' player\'s turn.';
       } else {
          msg += 'Game ended in a draw.';
@@ -167,25 +224,14 @@ $(function (){
       $('#cb_nav_next_turn').attr('disabled', !game.canRedo);
       $('#cb_nav_last').attr('disabled', !game.canRedo);
 
-      if (!game.canRedo) {
+      $('#cb_undo').attr('disabled', !liveView || !currentGame.canUndo);
-         $('#cb_undo').attr('disabled', !currentGame.canUndo);
+      $('#cb_redo').attr('disabled', !liveView || !currentGame.canRedo);
-         $('#cb_redo').attr('disabled', !currentGame.canRedo);
+      $('#cb_resign').attr('disabled', !liveView || !playing);
-         if (currentGame.status === PS.PLAYING) {
+
-            $('#cb_pass').attr('disabled', currentGame.board.phantom ? true : false);
+      if (liveView) {
-         } else {
+         $('#cb_board').addClass('cb-live').removeClass('cb-archive');
-            $('#cb_pass').attr('disabled', true);
-         }
-         $('#cb_resign').attr('disabled', currentGame.status !== PS.PLAYING);
-         $('#cb_board').addClass('cb-live');
-         $('#cb_board').removeClass('cb-archive');
       } else {
-         $('#cb_undo').attr('disabled', true);
+         $('#cb_board').removeClass('cb-live').addClass('cb-archive');
-         $('#cb_redo').attr('disabled', true);
-         $('#cb_pass').attr('disabled', true);
-         $('#cb_resign').attr('disabled', true);
-         $('#cb_board .ui-draggable').draggable('disable');
-         $('#cb_board').removeClass('cb-live');
-         $('#cb_board').addClass('cb-archive');
       }
    }
 
@@ -714,7 +760,7 @@ $(function (){
                      } else if (move.resign) {
                         game.resign();
                      } else {
-                        throw { message: "unknown move", move: move };
+                        throw { message: 'unknown move', move: move };
                      }
                   }