client/src/components/BaseGame.vue

   1 <template lang="pug">
   2 div#baseGame
   3   input#modalEog.modal(type="checkbox")
   4   div#eogDiv(
   5     role="dialog"
   6     data-checkbox="modalEog"
   7   )
   8     .card.text-center
   9       label.modal-close(for="modalEog")
  10       h3.section {{ endgameMessage }}
  11   #gameContainer
  12     #boardContainer
  13       Board(
  14         ref="board"
  15         :vr="vr"
  16         :last-move="lastMove"
  17         :analyze="mode=='analyze'"
  18         :score="game.score"
  19         :user-color="game.mycolor"
  20         :orientation="orientation"
  21         :vname="game.vname"
  22         :incheck="incheck"
  23         @play-move="play"
  24         @click-square="clickSquare"
  25         @rendered="adjustSize"
  26       )
  27       #turnIndicator(v-if="showTurn") {{ turn }}
  28       #controls.button-group
  29         button(@click="gotoBegin()")
  30           img.inline(src="/images/icons/fast-forward_rev.svg")
  31         button(@click="undo()")
  32           img.inline(src="/images/icons/play_rev.svg")
  33         button(v-if="canFlip" @click="flip()")
  34           img.inline(src="/images/icons/flip.svg")
  35         button(
  36           @click="runAutoplay()"
  37           :class="{'in-autoplay': autoplay}"
  38         )
  39           img.inline(src="/images/icons/autoplay.svg")
  40         button(@click="play()")
  41           img.inline(src="/images/icons/play.svg")
  42         button(@click="gotoEnd()")
  43           img.inline(src="/images/icons/fast-forward.svg")
  44       p#fenAnalyze(v-show="showFen") {{ (!!vr ? vr.getFen() : "") }}
  45     #movesList
  46       MoveList(
  47         ref="moveslist"
  48         :show="showMoves"
  49         :canAnalyze="canAnalyze"
  50         :canDownload="allowDownloadPGN"
  51         :score="game.score"
  52         :message="game.scoreMsg"
  53         :firstNum="firstMoveNumber"
  54         :moves="moves"
  55         :cursor="cursor"
  56         :vname="game.vname"
  57         @download="download"
  58         @showrules="showRules"
  59         @analyze="toggleAnalyze"
  60         @goto-move="gotoMove"
  61         @redraw-board="redrawBoard"
  62       )
  63     .clearer
  64 </template>
  65
  66 <script>
  67 import Board from "@/components/Board.vue";
  68 import MoveList from "@/components/MoveList.vue";
  69 import params from "@/parameters";
  70 import { store } from "@/store";
  71 import { getSquareId } from "@/utils/squareId";
  72 import { getDate } from "@/utils/datetime";
  73 import { processModalClick } from "@/utils/modalClick";
  74 import { getScoreMessage } from "@/utils/scoring";
  75 import { getFullNotation } from "@/utils/notation";
  76 import { undoMove } from "@/utils/playUndo";
  77 export default {
  78   name: "my-base-game",
  79   components: {
  80     Board,
  81     MoveList
  82   },
  83   props: ["game"],
  84   data: function() {
  85     return {
  86       st: store.state,
  87       // NOTE: all following variables must be reset at the beginning of a game
  88       vr: null, //VariantRules object, game state
  89       endgameMessage: "",
  90       orientation: "w",
  91       mode: "",
  92       gameMode: "",
  93       score: "*", //'*' means 'unfinished'
  94       moves: [],
  95       cursor: -1, //index of the move just played
  96       lastMove: null,
  97       touchLastClick: "",
  98       firstMoveNumber: 0, //for printing
  99       incheck: [], //for Board
 100       inMultimove: false,
 101       autoplay: false,
 102       inPlay: false,
 103       stackToPlay: []
 104     };
 105   },
 106   computed: {
 107     turn: function() {
 108       if (!this.vr) return "";
 109       if (this.vr.showMoves != "all") {
 110         return this.st.tr[
 111           (this.vr.turn == 'w' ? "White" : "Black") + " to move"];
 112       }
 113       // Cannot flip (racing king or circular chess), or Monochrome
 114       return (
 115         this.vr.movesCount == 0 && this.game.mycolor == "w"
 116           ? this.st.tr["It's your turn!"]
 117           : ""
 118       );
 119     },
 120     showFen: function() {
 121       return (
 122         this.mode == "analyze" &&
 123         this.$router.currentRoute.path.indexOf("/analyse") === -1
 124       );
 125     },
 126     // TODO: is it OK to pass "computed" as properties?
 127     // Also, some are seemingly not recomputed when vr is initialized.
 128     showMoves: function() {
 129       return (
 130         !!this.game.score && this.game.score != "*"
 131           ? "all"
 132           : (!!this.vr ? this.vr.showMoves : "none")
 133       );
 134     },
 135     showTurn: function() {
 136       return (
 137         !!this.game.score && this.game.score == '*' &&
 138         !!this.vr &&
 139         (
 140           this.vr.showMoves != "all" ||
 141           !this.vr.canFlip ||
 142           this.vr.showFirstTurn
 143         )
 144       );
 145     },
 146     canAnalyze: function() {
 147       return (
 148         (!this.game.mode || this.game.mode != "analyze") &&
 149         !!this.vr && this.vr.canAnalyze
 150       );
 151     },
 152     canFlip: function() {
 153       return !!this.vr && this.vr.canFlip;
 154     },
 155     allowDownloadPGN: function() {
 156       return (
 157         (!!this.game.score && this.game.score != "*") ||
 158         (!!this.vr && !this.vr.someHiddenMoves)
 159       );
 160     }
 161   },
 162   created: function() {
 163     if (!!this.game.fenStart) this.re_setVariables();
 164   },
 165   mounted: function() {
 166     if (!("ontouchstart" in window)) {
 167       // Desktop browser:
 168       const baseGameDiv = document.getElementById("baseGame");
 169       baseGameDiv.tabIndex = 0;
 170       baseGameDiv.addEventListener("click", this.focusBg);
 171       baseGameDiv.addEventListener("keydown", this.handleKeys);
 172       if (this.st.settings.scrollmove)
 173         baseGameDiv.addEventListener("wheel", this.handleScroll);
 174     }
 175     document.getElementById("eogDiv")
 176       .addEventListener("click", processModalClick);
 177   },
 178   beforeDestroy: function() {
 179     // TODO: probably not required
 180     this.autoplay = false;
 181   },
 182   methods: {
 183     focusBg: function() {
 184       document.getElementById("baseGame").focus();
 185     },
 186     handleKeys: function(e) {
 187       if ([32, 37, 38, 39, 40].includes(e.keyCode)) e.preventDefault();
 188       switch (e.keyCode) {
 189         case 37:
 190           this.undo();
 191           break;
 192         case 39:
 193           this.play();
 194           break;
 195         case 38:
 196           this.gotoBegin();
 197           break;
 198         case 40:
 199           this.gotoEnd();
 200           break;
 201         case 32:
 202           this.flip();
 203           break;
 204       }
 205     },
 206     handleScroll: function(e) {
 207       e.preventDefault();
 208       if (e.deltaY < 0) this.undo();
 209       else if (e.deltaY > 0) this.play();
 210     },
 211     adjustSize: function() {
 212       this.$refs["moveslist"].adjustBoard("vertical");
 213     },
 214     redrawBoard: function() {
 215       this.$refs["board"].re_setDrawings();
 216     },
 217     showRules: function() {
 218       // The button is here only on Game page:
 219       document.getElementById("modalRules").checked = true;
 220     },
 221     re_setVariables: function(game) {
 222       if (!game) game = this.game; //in case of...
 223       this.endgameMessage = "";
 224       // "w": default orientation for observed games
 225       this.orientation = game.mycolor || "w";
 226       this.mode = game.mode || game.type; //TODO: merge...
 227       this.moves = JSON.parse(JSON.stringify(game.moves || []));
 228       // Post-processing: decorate each move with notation and FEN
 229       this.vr = new V(game.fenStart);
 230       this.inMultimove = false; //in case of
 231       if (!!this.$refs["board"])
 232         // Also in case of:
 233         this.$refs["board"].resetCurrentAttempt();
 234       let analyseBtn = document.getElementById("analyzeBtn");
 235       if (!!analyseBtn) analyseBtn.classList.remove("active");
 236       const parsedFen = V.ParseFen(game.fenStart);
 237       const firstMoveColor = parsedFen.turn;
 238       this.firstMoveNumber = Math.floor(parsedFen.movesCount / 2) + 1;
 239       let L = this.moves.length;
 240       this.moves.forEach((move,idx) => {
 241         // Strategy working also for multi-moves:
 242         if (!Array.isArray(move)) move = [move];
 243         move.forEach(m => {
 244           m.notation = this.vr.getNotation(m);
 245           m.unambiguous = V.GetUnambiguousNotation(m);
 246           this.vr.play(m);
 247         });
 248         const Lm = move.length;
 249         move[Lm - 1].fen = this.vr.getFen();
 250         if (idx < L - 1 && this.vr.getCheckSquares().length > 0)
 251           move[Lm - 1].notation += "+";
 252       });
 253       this.incheck = this.vr.getCheckSquares();
 254       this.score = this.vr.getCurrentScore();
 255       if (L >= 1) {
 256         const move =
 257           !Array.isArray(this.moves[L - 1])
 258             ? [this.moves[L - 1]]
 259             : this.moves[L - 1];
 260         const Lm = move.length;
 261         if (["1-0", "0-1"].includes(this.score)) move[Lm - 1].notation += "#";
 262         else if (this.incheck.length > 0) move[Lm - 1].notation += "+";
 263       }
 264       if (this.score != '*') {
 265         // Show score on screen
 266         const message = getScoreMessage(this.score);
 267         this.showEndgameMsg(this.score + " . " + this.st.tr[message]);
 268       }
 269       if (firstMoveColor == "b") {
 270         // 'start' & 'end' is required for Board component
 271         this.moves.unshift({
 272           notation: "...",
 273           unambiguous: "...",
 274           start: { x: -1, y: -1 },
 275           end: { x: -1, y: -1 },
 276           fen: game.fenStart
 277         });
 278         L++;
 279       }
 280       this.positionCursorTo(L - 1);
 281     },
 282     positionCursorTo: function(index) {
 283       this.cursor = index;
 284       // Note: last move in moves array might be a multi-move
 285       if (index >= 0) this.lastMove = this.moves[index];
 286       else this.lastMove = null;
 287     },
 288     toggleAnalyze: function() {
 289       // Freeze while choices are shown (and autoplay has priority)
 290       if (
 291         this.inPlay ||
 292         this.$refs["board"].choices.length > 0 ||
 293         this.autoplay
 294       ) {
 295         return;
 296       }
 297       if (this.mode != "analyze") {
 298         // Enter analyze mode:
 299         this.gameMode = this.mode; //was not 'analyze'
 300         this.mode = "analyze";
 301         if (this.inMultimove) this.cancelCurrentMultimove();
 302         this.gameCursor = this.cursor;
 303         this.gameMoves = JSON.parse(JSON.stringify(this.moves));
 304         document.getElementById("analyzeBtn").classList.add("active");
 305       }
 306       else {
 307         // Exit analyze mode:
 308         this.mode = this.gameMode;
 309         this.cursor = this.gameCursor;
 310         this.moves = this.gameMoves;
 311         let fen = this.game.fenStart;
 312         if (this.cursor >= 0) {
 313           let mv = this.moves[this.cursor];
 314           if (!Array.isArray(mv)) mv = [mv];
 315           fen = mv[mv.length-1].fen;
 316         }
 317         this.vr = new V(fen);
 318         this.inMultimove = false; //in case of
 319         this.$refs["board"].resetCurrentAttempt(); //also in case of
 320         this.incheck = this.vr.getCheckSquares();
 321         if (this.cursor >= 0) this.lastMove = this.moves[this.cursor];
 322         else this.lastMove = null;
 323         document.getElementById("analyzeBtn").classList.remove("active");
 324       }
 325     },
 326     download: function() {
 327       const content = this.getPgn();
 328       // Prepare and trigger download link
 329       let downloadAnchor = document.getElementById("download");
 330       downloadAnchor.setAttribute("download", "game.pgn");
 331       downloadAnchor.href =
 332         "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 333       downloadAnchor.click();
 334     },
 335     getPgn: function() {
 336       let pgn = "";
 337       pgn += '[Site "vchess.club"]\n';
 338       pgn += '[Variant "' + this.game.vname + '"]\n';
 339       const gdt = getDate(new Date(this.game.created || Date.now()));
 340       pgn += '[Date "' + gdt + '"]\n';
 341       pgn += '[White "' + this.game.players[0].name + '"]\n';
 342       pgn += '[Black "' + this.game.players[1].name + '"]\n';
 343       pgn += '[Fen "' + this.game.fenStart + '"]\n';
 344       pgn += '[Result "' + this.game.score + '"]\n';
 345       if (!!this.game.id)
 346         pgn += '[Url "' + params.serverUrl + '/game/' + this.game.id + '"]\n';
 347       if (!!this.game.cadence)
 348         pgn += '[Cadence "' + this.game.cadence + '"]\n';
 349       pgn += '[Options "' + JSON.stringify(this.game.options) + '"]\n';
 350       pgn += '\n';
 351       for (let i = 0; i < this.moves.length; i += 2) {
 352         if (i > 0) pgn += " ";
 353         // Adjust dots notation for a better display:
 354         let fullNotation = getFullNotation(this.moves[i]);
 355         if (fullNotation == "...") fullNotation = "..";
 356         pgn += (i / 2 + this.firstMoveNumber) + "." + fullNotation;
 357         if (i+1 < this.moves.length)
 358           pgn += " " + getFullNotation(this.moves[i+1]);
 359       }
 360       pgn += "\n\n";
 361       for (let i = 0; i < this.moves.length; i += 2) {
 362         const moveNumber = i / 2 + this.firstMoveNumber;
 363         // Skip "dots move", useless for machine reading:
 364         if (this.moves[i].notation != "...") {
 365           pgn += moveNumber + ".w " +
 366             getFullNotation(this.moves[i], "unambiguous") + "\n";
 367         }
 368         if (i+1 < this.moves.length) {
 369           pgn += moveNumber + ".b " +
 370             getFullNotation(this.moves[i+1], "unambiguous") + "\n";
 371         }
 372       }
 373       return pgn;
 374     },
 375     showEndgameMsg: function(message) {
 376       this.endgameMessage = message;
 377       document.getElementById("modalEog").checked = true;
 378     },
 379     runAutoplay: function() {
 380       if (this.autoplay) {
 381         this.autoplay = false;
 382         if (this.stackToPlay.length > 0)
 383           // Move(s) arrived in-between
 384           this.play(this.stackToPlay.pop(), "received");
 385       }
 386       else if (this.cursor < this.moves.length - 1) {
 387         this.autoplay = true;
 388         this.play(null, null, null, "autoplay");
 389       }
 390     },
 391     // Animate an elementary move
 392     animateMove: function(move, callback) {
 393       let startSquare = document.getElementById(getSquareId(move.start));
 394       if (!startSquare) return; //shouldn't happen but...
 395       let endSquare = document.getElementById(getSquareId(move.end));
 396       let rectStart = startSquare.getBoundingClientRect();
 397       let rectEnd = endSquare.getBoundingClientRect();
 398       let translation = {
 399         x: rectEnd.x - rectStart.x,
 400         y: rectEnd.y - rectStart.y
 401       };
 402       let movingPiece = document.querySelector(
 403         "#" + getSquareId(move.start) + " > img.piece"
 404       );
 405       // For some unknown reasons Opera get "movingPiece == null" error
 406       // TODO: is it calling 'animate()' twice ? One extra time ?
 407       if (!movingPiece) return;
 408       const squares = document.getElementsByClassName("board");
 409       for (let i = 0; i < squares.length; i++) {
 410         let square = squares.item(i);
 411         if (square.id != getSquareId(move.start))
 412           // HACK for animation:
 413           // (with positive translate, image slides "under background")
 414           square.style.zIndex = "-1";
 415       }
 416       movingPiece.style.transform =
 417         "translate(" + translation.x + "px," + translation.y + "px)";
 418       movingPiece.style.transitionDuration = "0.25s";
 419       movingPiece.style.zIndex = "3000";
 420       setTimeout(() => {
 421         for (let i = 0; i < squares.length; i++)
 422           squares.item(i).style.zIndex = "auto";
 423         movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 424         callback();
 425       }, 250);
 426     },
 427     // For Analyse mode:
 428     emitFenIfAnalyze: function() {
 429       if (this.game.mode == "analyze") {
 430         let fen = this.game.fenStart;
 431         if (!!this.lastMove) {
 432           if (Array.isArray(this.lastMove)) {
 433             const L = this.lastMove.length;
 434             fen = this.lastMove[L-1].fen;
 435           }
 436           else fen = this.lastMove.fen;
 437         }
 438         this.$emit("fenchange", fen);
 439       }
 440     },
 441     clickSquare: function(square) {
 442       // Some variants make use of a single click at specific times:
 443       const move_s = this.vr.doClick(square);
 444       if (!!move_s) {
 445         const playMove = () => {
 446           if (!Array.isArray(move_s)) this.play(move_s);
 447           else this.$refs["board"].choices = move_s;
 448         }
 449         if ("ontouchstart" in window) {
 450           const squareId = "sq-" + square[0] + "-" + square[1];
 451           const highlight = function(on, sq) {
 452             let elt = document.getElementById(sq);
 453             if (!!elt) {
 454               if (on) elt.classList.add("touch-hover");
 455               else elt.classList.remove("touch-hover");
 456             }
 457           }
 458           // Touch screen (smartphone): require confirmation
 459           const squareStr = square[0] + "_" + square[1]
 460           if (this.touchLastClick == squareId) {
 461             highlight(false, squareId);
 462             playMove();
 463           }
 464           else {
 465             highlight(true, squareId);
 466             highlight(false, this.touchLastClick);
 467           }
 468           this.touchLastClick = squareId;
 469         }
 470         else playMove();
 471       }
 472     },
 473     // "light": if gotoMove() or gotoEnd()
 474     play: function(move, received, light, autoplay) {
 475       // Freeze while choices are shown:
 476       if (
 477         !!this.$refs["board"].selectedPiece ||
 478         this.$refs["board"].choices.length > 0
 479       ) {
 480         return;
 481       }
 482       const navigate = !move;
 483       // Forbid navigation during autoplay:
 484       if (navigate && this.autoplay && !autoplay) return;
 485       // Forbid playing outside analyze mode, except if move is received.
 486       // Sufficient condition because Board already knows which turn it is.
 487       if (
 488         this.mode != "analyze" &&
 489         !navigate &&
 490         !received &&
 491         (this.game.score != "*" || this.cursor < this.moves.length - 1)
 492       ) {
 493         return;
 494       }
 495       if (!!received) {
 496         if (this.autoplay || this.inPlay) {
 497           // Received moves while autoplaying are stacked,
 498           // and in observed games they could arrive too fast:
 499           this.stackToPlay.unshift(move);
 500           return;
 501         }
 502         if (this.mode == "analyze") this.toggleAnalyze();
 503         if (this.cursor < this.moves.length - 1)
 504           // To play a received move, cursor must be at the end of the game:
 505           this.gotoEnd();
 506         this.inPlay = true;
 507       }
 508       // The board may show some possible moves: (TODO: bad solution)
 509       this.$refs["board"].resetCurrentAttempt();
 510       const playSubmove = (smove) => {
 511         smove.notation = this.vr.getNotation(smove);
 512         smove.unambiguous = V.GetUnambiguousNotation(smove);
 513         this.vr.play(smove);
 514         if (this.inMultimove && !!this.lastMove) {
 515           if (!Array.isArray(this.lastMove))
 516             this.lastMove = [this.lastMove, smove];
 517           else this.lastMove.push(smove);
 518         }
 519         if (!this.inMultimove) {
 520           // First sub-move:
 521           this.lastMove = smove;
 522           // Condition is "!navigate" but we mean "!this.autoplay"
 523           if (!navigate) {
 524             if (this.cursor < this.moves.length - 1)
 525               this.moves = this.moves.slice(0, this.cursor + 1);
 526             this.moves.push(smove);
 527           }
 528           this.inMultimove = true; //potentially
 529           this.cursor++;
 530         }
 531         else if (!navigate) {
 532           // Already in the middle of a multi-move
 533           const L = this.moves.length;
 534           if (!Array.isArray(this.moves[L-1]))
 535             this.$set(this.moves, L-1, [this.moves[L-1], smove]);
 536           else this.moves[L-1].push(smove);
 537         }
 538       };
 539       const playMove = () => {
 540         const animate = (
 541           ["all", "highlight"].includes(V.ShowMoves) &&
 542           (this.autoplay || !!received)
 543         );
 544         if (!Array.isArray(move)) move = [move];
 545         let moveIdx = 0;
 546         let self = this;
 547         const initurn = this.vr.turn;
 548         (function executeMove() {
 549           const smove = move[moveIdx++];
 550           // NOTE: condition "smove.start.x >= 0" required for Dynamo,
 551           // because second move may be empty. noHighlight condition
 552           // is used at least for Chakart.
 553           if (animate && smove.start.x >= 0 && !smove.end.noHighlight) {
 554             self.animateMove(smove, () => {
 555               playSubmove(smove);
 556               if (moveIdx < move.length) setTimeout(executeMove, 500);
 557               else afterMove(smove, initurn);
 558             });
 559           }
 560           else {
 561             playSubmove(smove);
 562             if (moveIdx < move.length) executeMove();
 563             else afterMove(smove, initurn);
 564           }
 565         })();
 566       };
 567       const computeScore = () => {
 568         const score = this.vr.getCurrentScore();
 569         if (!navigate) {
 570           if (["1-0", "0-1"].includes(score)) {
 571             if (Array.isArray(this.lastMove)) {
 572               const L = this.lastMove.length;
 573               this.lastMove[L - 1].notation += "#";
 574             }
 575             else this.lastMove.notation += "#";
 576           }
 577         }
 578         if (score != "*" && ["analyze", "versus"].includes(this.mode)) {
 579           const message = getScoreMessage(score, V.ReverseColors);
 580           // Show score on screen
 581           this.showEndgameMsg(score + " . " + this.st.tr[message]);
 582         }
 583         return score;
 584       };
 585       const afterMove = (smove, initurn) => {
 586         if (this.vr.turn != initurn) {
 587           // Turn has changed: move is complete
 588           if (!smove.fen)
 589             // NOTE: only FEN of last sub-move is required (=> setting it here)
 590             smove.fen = this.vr.getFen();
 591           this.emitFenIfAnalyze();
 592           this.inMultimove = false;
 593           this.incheck = this.vr.getCheckSquares();
 594           if (this.incheck.length > 0) smove.notation += "+";
 595           this.score = computeScore();
 596           if (this.autoplay) {
 597             if (this.cursor < this.moves.length - 1)
 598               setTimeout(() => this.play(null, null, null, "autoplay"), 1000);
 599             else {
 600               this.autoplay = false;
 601               if (this.stackToPlay.length > 0)
 602                 // Move(s) arrived in-between
 603                 this.play(this.stackToPlay.pop(), "received");
 604             }
 605           }
 606           if (this.mode != "analyze" && !navigate) {
 607             if (!received) {
 608               // Post-processing (e.g. computer play).
 609               const L = this.moves.length;
 610               // NOTE: always emit the score, even in unfinished
 611               this.$emit("newmove", this.moves[L-1], { score: this.score });
 612             }
 613             else {
 614               this.inPlay = false;
 615               if (this.stackToPlay.length > 0)
 616                 // Move(s) arrived in-between
 617                 this.play(this.stackToPlay.pop(), "received");
 618             }
 619           }
 620         }
 621       };
 622       // NOTE: navigate and received are mutually exclusive
 623       if (navigate) {
 624         // The move to navigate to is necessarily full:
 625         if (this.cursor == this.moves.length - 1) return; //no more moves
 626         move = this.moves[this.cursor + 1];
 627         if (!this.autoplay) {
 628           // Just play the move:
 629           if (!Array.isArray(move)) move = [move];
 630           for (let i=0; i < move.length; i++) this.vr.play(move[i]);
 631           if (!light) {
 632             this.lastMove = move;
 633             this.incheck = this.vr.getCheckSquares();
 634             this.score = computeScore();
 635             this.emitFenIfAnalyze();
 636           }
 637           this.cursor++;
 638           return;
 639         }
 640       }
 641       playMove();
 642     },
 643     cancelCurrentMultimove: function() {
 644       const L = this.moves.length;
 645       let move = this.moves[L-1];
 646       if (!Array.isArray(move)) move = [move];
 647       for (let i = move.length - 1; i >= 0; i--) this.vr.undo(move[i]);
 648       this.moves.pop();
 649       this.cursor--;
 650       this.inMultimove = false;
 651     },
 652     cancelLastMove: function() {
 653       // The last played move was canceled (corr game)
 654       this.undo();
 655       this.moves.pop();
 656     },
 657     // "light": if gotoMove() or gotoBegin()
 658     undo: function(move, light) {
 659       if (
 660         this.autoplay ||
 661         !!this.$refs["board"].selectedPiece ||
 662         this.$refs["board"].choices.length > 0
 663       ) {
 664         return;
 665       }
 666       this.$refs["board"].resetCurrentAttempt();
 667       if (this.inMultimove) {
 668         this.cancelCurrentMultimove();
 669         this.incheck = this.vr.getCheckSquares();
 670         if (this.cursor >= 0) this.lastMove = this.moves[this.cursor];
 671         else this.lastMove = null;
 672       }
 673       else {
 674         if (!move) {
 675           const minCursor =
 676             this.moves.length > 0 && this.moves[0].notation == "..."
 677               ? 1
 678               : 0;
 679           if (this.cursor < minCursor) return; //no more moves
 680           move = this.moves[this.cursor];
 681         }
 682         this.$refs["board"].resetCurrentAttempt();
 683         undoMove(move, this.vr);
 684         if (light) this.cursor--;
 685         else {
 686           this.positionCursorTo(this.cursor - 1);
 687           this.incheck = this.vr.getCheckSquares();
 688           this.emitFenIfAnalyze();
 689         }
 690       }
 691     },
 692     gotoMove: function(index) {
 693       if (
 694         this.autoplay ||
 695         !!this.$refs["board"].selectedPiece ||
 696         this.$refs["board"].choices.length > 0
 697       ) {
 698         return;
 699       }
 700       this.$refs["board"].resetCurrentAttempt();
 701       if (this.inMultimove) this.cancelCurrentMultimove();
 702       if (index == this.cursor) return;
 703       if (index < this.cursor) {
 704         while (this.cursor > index)
 705           this.undo(null, null, "light");
 706       }
 707       else {
 708         // index > this.cursor)
 709         while (this.cursor < index)
 710           this.play(null, null, "light");
 711       }
 712       // NOTE: next line also re-assign cursor, but it's very light
 713       this.positionCursorTo(index);
 714       this.incheck = this.vr.getCheckSquares();
 715       this.emitFenIfAnalyze();
 716     },
 717     gotoBegin: function() {
 718       if (
 719         this.autoplay ||
 720         !!this.$refs["board"].selectedPiece ||
 721         this.$refs["board"].choices.length > 0
 722       ) {
 723         return;
 724       }
 725       this.$refs["board"].resetCurrentAttempt();
 726       if (this.inMultimove) this.cancelCurrentMultimove();
 727       const minCursor =
 728         this.moves.length > 0 && this.moves[0].notation == "..."
 729           ? 1
 730           : 0;
 731       while (this.cursor >= minCursor) this.undo(null, null, "light");
 732       this.lastMove = (minCursor == 1 ? this.moves[0] : null);
 733       this.incheck = this.vr.getCheckSquares();
 734       this.emitFenIfAnalyze();
 735     },
 736     gotoEnd: function() {
 737       if (this.cursor == this.moves.length - 1) return;
 738       this.gotoMove(this.moves.length - 1);
 739     },
 740     flip: function() {
 741       if (this.$refs["board"].choices.length > 0) return;
 742       this.orientation = V.GetOppCol(this.orientation);
 743     }
 744   }
 745 };
 746 </script>
 747
 748 <style lang="sass" scoped>
 749 [type="checkbox"]#modalEog+div .card
 750   min-height: 45px
 751   max-width: 350px
 752
 753 #baseGame
 754   width: 100%
 755   &:focus
 756     outline: none
 757
 758 #gameContainer
 759   margin-left: auto
 760   margin-right: auto
 761
 762 #downloadDiv
 763   display: inline-block
 764
 765 #controls
 766   user-select: none
 767   button
 768     border: none
 769     margin: 0
 770     padding-top: 5px
 771     padding-bottom: 5px
 772
 773 p#fenAnalyze
 774   margin: 5px
 775
 776 .in-autoplay
 777   background-color: #FACF8C
 778
 779 img.inline
 780   height: 22px
 781   padding-top: 5px
 782   @media screen and (max-width: 767px)
 783     height: 18px
 784
 785 #turnIndicator
 786   text-align: center
 787   font-weight: bold
 788
 789 #boardContainer
 790   float: left
 791 // TODO: later, maybe, allow movesList of variable width
 792 // or e.g. between 250 and 350px (but more complicated)
 793
 794 #movesList
 795   width: 280px
 796   float: left
 797
 798 @media screen and (max-width: 767px)
 799   #movesList
 800     width: 100%
 801     float: none
 802     clear: both
 803 </style>