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