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       if (L == 0) {
 234         // Could be started on a random position in analysis mode:
 235         this.incheck = this.vr.getCheckSquares();
 236         this.score = this.vr.getCurrentScore();
 237         if (this.score != '*') {
 238           // Show score on screen
 239           const message = getScoreMessage(this.score);
 240           this.showEndgameMsg(this.score + " . " + this.st.tr[message]);
 241         }
 242       }
 243       else {
 244         this.moves.forEach((move,idx) => {
 245           // Strategy working also for multi-moves:
 246           if (!Array.isArray(move)) move = [move];
 247           const Lm = move.length;
 248           move.forEach((m,idxM) => {
 249             m.notation = this.vr.getNotation(m);
 250             m.unambiguous = V.GetUnambiguousNotation(m);
 251             this.vr.play(m);
 252             const checkSquares = this.vr.getCheckSquares();
 253             if (checkSquares.length > 0) m.notation += "+";
 254             if (idxM == Lm - 1) m.fen = this.vr.getFen();
 255             if (idx == L - 1 && idxM == Lm - 1) {
 256               this.incheck = checkSquares;
 257               this.score = this.vr.getCurrentScore();
 258               if (["1-0", "0-1"].includes(this.score)) m.notation += "#";
 259             }
 260           });
 261         });
 262       }
 263       if (firstMoveColor == "b") {
 264         // 'start' & 'end' is required for Board component
 265         this.moves.unshift({
 266           notation: "...",
 267           unambiguous: "...",
 268           start: { x: -1, y: -1 },
 269           end: { x: -1, y: -1 },
 270           fen: game.fenStart
 271         });
 272         L++;
 273       }
 274       this.positionCursorTo(L - 1);
 275     },
 276     positionCursorTo: function(index) {
 277       this.cursor = index;
 278       // Note: last move in moves array might be a multi-move
 279       if (index >= 0) this.lastMove = this.moves[index];
 280       else this.lastMove = null;
 281     },
 282     toggleAnalyze: function() {
 283       // Freeze while choices are shown (and autoplay has priority)
 284       if (
 285         this.inPlay ||
 286         this.$refs["board"].choices.length > 0 ||
 287         this.autoplay
 288       ) {
 289         return;
 290       }
 291       if (this.mode != "analyze") {
 292         // Enter analyze mode:
 293         this.gameMode = this.mode; //was not 'analyze'
 294         this.mode = "analyze";
 295         if (this.inMultimove) this.cancelCurrentMultimove();
 296         this.gameCursor = this.cursor;
 297         this.gameMoves = JSON.parse(JSON.stringify(this.moves));
 298         document.getElementById("analyzeBtn").classList.add("active");
 299       }
 300       else {
 301         // Exit analyze mode:
 302         this.mode = this.gameMode;
 303         this.cursor = this.gameCursor;
 304         this.moves = this.gameMoves;
 305         let fen = this.game.fenStart;
 306         if (this.cursor >= 0) {
 307           let mv = this.moves[this.cursor];
 308           if (!Array.isArray(mv)) mv = [mv];
 309           fen = mv[mv.length-1].fen;
 310         }
 311         this.vr = new V(fen);
 312         this.inMultimove = false; //in case of
 313         this.$refs["board"].resetCurrentAttempt(); //also in case of
 314         this.incheck = this.vr.getCheckSquares();
 315         if (this.cursor >= 0) this.lastMove = this.moves[this.cursor];
 316         else this.lastMove = null;
 317         document.getElementById("analyzeBtn").classList.remove("active");
 318       }
 319     },
 320     download: function() {
 321       const content = this.getPgn();
 322       // Prepare and trigger download link
 323       let downloadAnchor = document.getElementById("download");
 324       downloadAnchor.setAttribute("download", "game.pgn");
 325       downloadAnchor.href =
 326         "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 327       downloadAnchor.click();
 328     },
 329     getPgn: function() {
 330       let pgn = "";
 331       pgn += '[Site "vchess.club"]\n';
 332       pgn += '[Variant "' + this.game.vname + '"]\n';
 333       const gdt = getDate(new Date(this.game.created || Date.now()));
 334       pgn += '[Date "' + gdt + '"]\n';
 335       pgn += '[White "' + this.game.players[0].name + '"]\n';
 336       pgn += '[Black "' + this.game.players[1].name + '"]\n';
 337       pgn += '[Fen "' + this.game.fenStart + '"]\n';
 338       pgn += '[Result "' + this.game.score + '"]\n';
 339       if (!!this.game.id)
 340         pgn += '[Url "' + params.serverUrl + '/game/' + this.game.id + '"]\n';
 341       if (!!this.game.cadence)
 342         pgn += '[Cadence "' + this.game.cadence + '"]\n';
 343       pgn += '\n';
 344       for (let i = 0; i < this.moves.length; i += 2) {
 345         if (i > 0) pgn += " ";
 346         // Adjust dots notation for a better display:
 347         let fullNotation = getFullNotation(this.moves[i]);
 348         if (fullNotation == "...") fullNotation = "..";
 349         pgn += (i / 2 + this.firstMoveNumber) + "." + fullNotation;
 350         if (i+1 < this.moves.length)
 351           pgn += " " + getFullNotation(this.moves[i+1]);
 352       }
 353       pgn += "\n\n";
 354       for (let i = 0; i < this.moves.length; i += 2) {
 355         const moveNumber = i / 2 + this.firstMoveNumber;
 356         // Skip "dots move", useless for machine reading:
 357         if (this.moves[i].notation != "...") {
 358           pgn += moveNumber + ".w " +
 359             getFullNotation(this.moves[i], "unambiguous") + "\n";
 360         }
 361         if (i+1 < this.moves.length) {
 362           pgn += moveNumber + ".b " +
 363             getFullNotation(this.moves[i+1], "unambiguous") + "\n";
 364         }
 365       }
 366       return pgn;
 367     },
 368     showEndgameMsg: function(message) {
 369       this.endgameMessage = message;
 370       document.getElementById("modalEog").checked = true;
 371     },
 372     runAutoplay: function() {
 373       if (this.autoplay) {
 374         this.autoplay = false;
 375         if (this.stackToPlay.length > 0)
 376           // Move(s) arrived in-between
 377           this.play(this.stackToPlay.pop(), "received");
 378       }
 379       else if (this.cursor < this.moves.length - 1) {
 380         this.autoplay = true;
 381         this.play(null, null, null, "autoplay");
 382       }
 383     },
 384     // Animate an elementary move
 385     animateMove: function(move, callback) {
 386       let startSquare = document.getElementById(getSquareId(move.start));
 387       if (!startSquare) return; //shouldn't happen but...
 388       let endSquare = document.getElementById(getSquareId(move.end));
 389       let rectStart = startSquare.getBoundingClientRect();
 390       let rectEnd = endSquare.getBoundingClientRect();
 391       let translation = {
 392         x: rectEnd.x - rectStart.x,
 393         y: rectEnd.y - rectStart.y
 394       };
 395       let movingPiece = document.querySelector(
 396         "#" + getSquareId(move.start) + " > img.piece"
 397       );
 398       // For some unknown reasons Opera get "movingPiece == null" error
 399       // TODO: is it calling 'animate()' twice ? One extra time ?
 400       if (!movingPiece) return;
 401       const squares = document.getElementsByClassName("board");
 402       for (let i = 0; i < squares.length; i++) {
 403         let square = squares.item(i);
 404         if (square.id != getSquareId(move.start))
 405           // HACK for animation:
 406           // (with positive translate, image slides "under background")
 407           square.style.zIndex = "-1";
 408       }
 409       movingPiece.style.transform =
 410         "translate(" + translation.x + "px," + translation.y + "px)";
 411       movingPiece.style.transitionDuration = "0.25s";
 412       movingPiece.style.zIndex = "3000";
 413       setTimeout(() => {
 414         for (let i = 0; i < squares.length; i++)
 415           squares.item(i).style.zIndex = "auto";
 416         movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 417         callback();
 418       }, 250);
 419     },
 420     // For Analyse mode:
 421     emitFenIfAnalyze: function() {
 422       if (this.game.mode == "analyze") {
 423         let fen = this.game.fenStart;
 424         if (!!this.lastMove) {
 425           if (Array.isArray(this.lastMove)) {
 426             const L = this.lastMove.length;
 427             fen = this.lastMove[L-1].fen;
 428           }
 429           else fen = this.lastMove.fen;
 430         }
 431         this.$emit("fenchange", fen);
 432       }
 433     },
 434     clickSquare: function(square) {
 435       // Some variants make use of a single click at specific times:
 436       const move = this.vr.doClick(square);
 437       if (!!move) this.play(move);
 438     },
 439     // "light": if gotoMove() or gotoEnd()
 440     play: function(move, received, light, autoplay) {
 441       // Freeze while choices are shown:
 442       if (
 443         !!this.$refs["board"].selectedPiece ||
 444         this.$refs["board"].choices.length > 0
 445       ) {
 446         return;
 447       }
 448       const navigate = !move;
 449       // Forbid navigation during autoplay:
 450       if (navigate && this.autoplay && !autoplay) return;
 451       // Forbid playing outside analyze mode, except if move is received.
 452       // Sufficient condition because Board already knows which turn it is.
 453       if (
 454         this.mode != "analyze" &&
 455         !navigate &&
 456         !received &&
 457         (this.game.score != "*" || this.cursor < this.moves.length - 1)
 458       ) {
 459         return;
 460       }
 461       if (!!received) {
 462         if (this.autoplay || this.inPlay) {
 463           // Received moves while autoplaying are stacked,
 464           // and in observed games they could arrive too fast:
 465           this.stackToPlay.unshift(move);
 466           return;
 467         }
 468         if (this.mode == "analyze") this.toggleAnalyze();
 469         if (this.cursor < this.moves.length - 1)
 470           // To play a received move, cursor must be at the end of the game:
 471           this.gotoEnd();
 472         this.inPlay = true;
 473       }
 474       // The board may show some possible moves: (TODO: bad solution)
 475       this.$refs["board"].resetCurrentAttempt();
 476       const playSubmove = (smove) => {
 477         smove.notation = this.vr.getNotation(smove);
 478         smove.unambiguous = V.GetUnambiguousNotation(smove);
 479         this.vr.play(smove);
 480         if (this.inMultimove && !!this.lastMove) {
 481           if (!Array.isArray(this.lastMove))
 482             this.lastMove = [this.lastMove, smove];
 483           else this.lastMove.push(smove);
 484         }
 485         // Is opponent (or me) in check?
 486         this.incheck = this.vr.getCheckSquares();
 487         if (this.incheck.length > 0) smove.notation += "+";
 488         if (!this.inMultimove) {
 489           // First sub-move:
 490           this.lastMove = smove;
 491           // Condition is "!navigate" but we mean "!this.autoplay"
 492           if (!navigate) {
 493             if (this.cursor < this.moves.length - 1)
 494               this.moves = this.moves.slice(0, this.cursor + 1);
 495             this.moves.push(smove);
 496           }
 497           this.inMultimove = true; //potentially
 498           this.cursor++;
 499         } else if (!navigate) {
 500           // Already in the middle of a multi-move
 501           const L = this.moves.length;
 502           if (!Array.isArray(this.moves[L-1]))
 503             this.$set(this.moves, L-1, [this.moves[L-1], smove]);
 504           else this.moves[L-1].push(smove);
 505         }
 506       };
 507       const playMove = () => {
 508         const animate = (
 509           ["all", "highlight"].includes(V.ShowMoves) &&
 510           (this.autoplay || !!received)
 511         );
 512         if (!Array.isArray(move)) move = [move];
 513         let moveIdx = 0;
 514         let self = this;
 515         const initurn = this.vr.turn;
 516         (function executeMove() {
 517           const smove = move[moveIdx++];
 518           // NOTE: condition "smove.start.x >= 0" required for Dynamo,
 519           // because second move may be empty. noHighlight condition
 520           // is used at least for Chakart.
 521           if (animate && smove.start.x >= 0 && !smove.end.noHighlight) {
 522             self.animateMove(smove, () => {
 523               playSubmove(smove);
 524               if (moveIdx < move.length) setTimeout(executeMove, 500);
 525               else afterMove(smove, initurn);
 526             });
 527           } else {
 528             playSubmove(smove);
 529             if (moveIdx < move.length) executeMove();
 530             else afterMove(smove, initurn);
 531           }
 532         })();
 533       };
 534       const computeScore = () => {
 535         const score = this.vr.getCurrentScore();
 536         if (!navigate) {
 537           if (["1-0", "0-1"].includes(score)) {
 538             if (Array.isArray(this.lastMove)) {
 539               const L = this.lastMove.length;
 540               this.lastMove[L - 1].notation += "#";
 541             }
 542             else this.lastMove.notation += "#";
 543           }
 544         }
 545         if (score != "*" && ["analyze", "versus"].includes(this.mode)) {
 546           const message = getScoreMessage(score);
 547           // Show score on screen
 548           this.showEndgameMsg(score + " . " + this.st.tr[message]);
 549         }
 550         return score;
 551       };
 552       const afterMove = (smove, initurn) => {
 553         if (this.vr.turn != initurn) {
 554           // Turn has changed: move is complete
 555           if (!smove.fen)
 556             // NOTE: only FEN of last sub-move is required (=> setting it here)
 557             smove.fen = this.vr.getFen();
 558           this.emitFenIfAnalyze();
 559           this.inMultimove = false;
 560           this.score = computeScore();
 561           if (this.autoplay) {
 562             if (this.cursor < this.moves.length - 1)
 563               setTimeout(() => this.play(null, null, null, "autoplay"), 1000);
 564             else {
 565               this.autoplay = false;
 566               if (this.stackToPlay.length > 0)
 567                 // Move(s) arrived in-between
 568                 this.play(this.stackToPlay.pop(), "received");
 569             }
 570           }
 571           if (this.mode != "analyze" && !navigate) {
 572             if (!received) {
 573               // Post-processing (e.g. computer play).
 574               const L = this.moves.length;
 575               // NOTE: always emit the score, even in unfinished
 576               this.$emit("newmove", this.moves[L-1], { score: this.score });
 577             } else {
 578               this.inPlay = false;
 579               if (this.stackToPlay.length > 0)
 580                 // Move(s) arrived in-between
 581                 this.play(this.stackToPlay.pop(), "received");
 582             }
 583           }
 584         }
 585       };
 586       // NOTE: navigate and received are mutually exclusive
 587       if (navigate) {
 588         // The move to navigate to is necessarily full:
 589         if (this.cursor == this.moves.length - 1) return; //no more moves
 590         move = this.moves[this.cursor + 1];
 591         if (!this.autoplay) {
 592           // Just play the move:
 593           if (!Array.isArray(move)) move = [move];
 594           for (let i=0; i < move.length; i++) this.vr.play(move[i]);
 595           if (!light) {
 596             this.lastMove = move;
 597             this.incheck = this.vr.getCheckSquares();
 598             this.score = computeScore();
 599             this.emitFenIfAnalyze();
 600           }
 601           this.cursor++;
 602           return;
 603         }
 604       }
 605       playMove();
 606     },
 607     cancelCurrentMultimove: function() {
 608       const L = this.moves.length;
 609       let move = this.moves[L-1];
 610       if (!Array.isArray(move)) move = [move];
 611       for (let i = move.length - 1; i >= 0; i--) this.vr.undo(move[i]);
 612       this.moves.pop();
 613       this.cursor--;
 614       this.inMultimove = false;
 615     },
 616     cancelLastMove: function() {
 617       // The last played move was canceled (corr game)
 618       this.undo();
 619       this.moves.pop();
 620     },
 621     // "light": if gotoMove() or gotoBegin()
 622     undo: function(move, light) {
 623       if (
 624         this.autoplay ||
 625         !!this.$refs["board"].selectedPiece ||
 626         this.$refs["board"].choices.length > 0
 627       ) {
 628         return;
 629       }
 630       this.$refs["board"].resetCurrentAttempt();
 631       if (this.inMultimove) {
 632         this.cancelCurrentMultimove();
 633         this.incheck = this.vr.getCheckSquares();
 634         if (this.cursor >= 0) this.lastMove = this.moves[this.cursor];
 635         else this.lastMove = null;
 636       } else {
 637         if (!move) {
 638           const minCursor =
 639             this.moves.length > 0 && this.moves[0].notation == "..."
 640               ? 1
 641               : 0;
 642           if (this.cursor < minCursor) return; //no more moves
 643           move = this.moves[this.cursor];
 644         }
 645         this.$refs["board"].resetCurrentAttempt();
 646         undoMove(move, this.vr);
 647         if (light) this.cursor--;
 648         else {
 649           this.positionCursorTo(this.cursor - 1);
 650           this.incheck = this.vr.getCheckSquares();
 651           this.emitFenIfAnalyze();
 652         }
 653       }
 654     },
 655     gotoMove: function(index) {
 656       if (
 657         this.autoplay ||
 658         !!this.$refs["board"].selectedPiece ||
 659         this.$refs["board"].choices.length > 0
 660       ) {
 661         return;
 662       }
 663       this.$refs["board"].resetCurrentAttempt();
 664       if (this.inMultimove) this.cancelCurrentMultimove();
 665       if (index == this.cursor) return;
 666       if (index < this.cursor) {
 667         while (this.cursor > index)
 668           this.undo(null, null, "light");
 669       }
 670       else {
 671         // index > this.cursor)
 672         while (this.cursor < index)
 673           this.play(null, null, "light");
 674       }
 675       // NOTE: next line also re-assign cursor, but it's very light
 676       this.positionCursorTo(index);
 677       this.incheck = this.vr.getCheckSquares();
 678       this.emitFenIfAnalyze();
 679     },
 680     gotoBegin: function() {
 681       if (
 682         this.autoplay ||
 683         !!this.$refs["board"].selectedPiece ||
 684         this.$refs["board"].choices.length > 0
 685       ) {
 686         return;
 687       }
 688       this.$refs["board"].resetCurrentAttempt();
 689       if (this.inMultimove) this.cancelCurrentMultimove();
 690       const minCursor =
 691         this.moves.length > 0 && this.moves[0].notation == "..."
 692           ? 1
 693           : 0;
 694       while (this.cursor >= minCursor) this.undo(null, null, "light");
 695       this.lastMove = (minCursor == 1 ? this.moves[0] : null);
 696       this.incheck = this.vr.getCheckSquares();
 697       this.emitFenIfAnalyze();
 698     },
 699     gotoEnd: function() {
 700       if (this.cursor == this.moves.length - 1) return;
 701       this.gotoMove(this.moves.length - 1);
 702     },
 703     flip: function() {
 704       if (this.$refs["board"].choices.length > 0) return;
 705       this.orientation = V.GetOppCol(this.orientation);
 706     }
 707   }
 708 };
 709 </script>
 710
 711 <style lang="sass" scoped>
 712 [type="checkbox"]#modalEog+div .card
 713   min-height: 45px
 714   max-width: 350px
 715
 716 #baseGame
 717   width: 100%
 718   &:focus
 719     outline: none
 720
 721 #gameContainer
 722   margin-left: auto
 723   margin-right: auto
 724
 725 #downloadDiv
 726   display: inline-block
 727
 728 #controls
 729   user-select: none
 730   button
 731     border: none
 732     margin: 0
 733     padding-top: 5px
 734     padding-bottom: 5px
 735
 736 p#fenAnalyze
 737   margin: 5px
 738
 739 .in-autoplay
 740   background-color: #FACF8C
 741
 742 img.inline
 743   height: 22px
 744   padding-top: 5px
 745   @media screen and (max-width: 767px)
 746     height: 18px
 747
 748 #turnIndicator
 749   text-align: center
 750   font-weight: bold
 751
 752 #boardContainer
 753   float: left
 754 // TODO: later, maybe, allow movesList of variable width
 755 // or e.g. between 250 and 350px (but more complicated)
 756
 757 #movesList
 758   width: 280px
 759   float: left
 760
 761 @media screen and (max-width: 767px)
 762   #movesList
 763     width: 100%
 764     float: none
 765     clear: both
 766 </style>