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