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