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