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       touchLastClick: "",
  96       firstMoveNumber: 0, //for printing
  97       incheck: [], //for Board
  98       inMultimove: false,
  99       autoplay: false,
 100       inPlay: false,
 101       stackToPlay: []
 102     };
 103   },
 104   computed: {
 105     turn: function() {
 106       if (!this.vr) return "";
 107       if (this.vr.showMoves != "all") {
 108         return this.st.tr[
 109           (this.vr.turn == 'w' ? "White" : "Black") + " to move"];
 110       }
 111       // Cannot flip (racing king or circular chess), or Monochrome
 112       return (
 113         this.vr.movesCount == 0 && this.game.mycolor == "w"
 114           ? this.st.tr["It's your turn!"]
 115           : ""
 116       );
 117     },
 118     showFen: function() {
 119       return (
 120         this.mode == "analyze" &&
 121         this.$router.currentRoute.path.indexOf("/analyse") === -1
 122       );
 123     },
 124     // TODO: is it OK to pass "computed" as properties?
 125     // Also, some are seemingly not recomputed when vr is initialized.
 126     showMoves: function() {
 127       return (
 128         !!this.game.score && this.game.score != "*"
 129           ? "all"
 130           : (!!this.vr ? this.vr.showMoves : "none")
 131       );
 132     },
 133     showTurn: function() {
 134       return (
 135         !!this.game.score && this.game.score == '*' &&
 136         !!this.vr &&
 137         (
 138           this.vr.showMoves != "all" ||
 139           !this.vr.canFlip ||
 140           this.vr.showFirstTurn
 141         )
 142       );
 143     },
 144     canAnalyze: function() {
 145       return (
 146         (!this.game.mode || this.game.mode != "analyze") &&
 147         !!this.vr && this.vr.canAnalyze
 148       );
 149     },
 150     canFlip: function() {
 151       return !!this.vr && this.vr.canFlip;
 152     },
 153     allowDownloadPGN: function() {
 154       return (
 155         (!!this.game.score && this.game.score != "*") ||
 156         (!!this.vr && !this.vr.someHiddenMoves)
 157       );
 158     }
 159   },
 160   created: function() {
 161     if (!!this.game.fenStart) this.re_setVariables();
 162   },
 163   mounted: function() {
 164     if (!("ontouchstart" in window)) {
 165       // Desktop browser:
 166       const baseGameDiv = document.getElementById("baseGame");
 167       baseGameDiv.tabIndex = 0;
 168       baseGameDiv.addEventListener("click", this.focusBg);
 169       baseGameDiv.addEventListener("keydown", this.handleKeys);
 170       baseGameDiv.addEventListener("wheel", this.handleScroll);
 171     }
 172     document.getElementById("eogDiv")
 173       .addEventListener("click", processModalClick);
 174   },
 175   beforeDestroy: function() {
 176     // TODO: probably not required
 177     this.autoplay = false;
 178   },
 179   methods: {
 180     focusBg: function() {
 181       document.getElementById("baseGame").focus();
 182     },
 183     handleKeys: function(e) {
 184       if ([32, 37, 38, 39, 40].includes(e.keyCode)) e.preventDefault();
 185       switch (e.keyCode) {
 186         case 37:
 187           this.undo();
 188           break;
 189         case 39:
 190           this.play();
 191           break;
 192         case 38:
 193           this.gotoBegin();
 194           break;
 195         case 40:
 196           this.gotoEnd();
 197           break;
 198         case 32:
 199           this.flip();
 200           break;
 201       }
 202     },
 203     handleScroll: function(e) {
 204       e.preventDefault();
 205       if (e.deltaY < 0) this.undo();
 206       else if (e.deltaY > 0) this.play();
 207     },
 208     redrawBoard: function() {
 209       this.$refs["board"].re_setDrawings();
 210     },
 211     showRules: function() {
 212       // The button is here only on Game page:
 213       document.getElementById("modalRules").checked = true;
 214     },
 215     re_setVariables: function(game) {
 216       if (!game) game = this.game; //in case of...
 217       this.endgameMessage = "";
 218       // "w": default orientation for observed games
 219       this.orientation = game.mycolor || "w";
 220       this.mode = game.mode || game.type; //TODO: merge...
 221       this.moves = JSON.parse(JSON.stringify(game.moves || []));
 222       // Post-processing: decorate each move with notation and FEN
 223       this.vr = new V(game.fenStart);
 224       this.inMultimove = false; //in case of
 225       if (!!this.$refs["board"])
 226         // Also in case of:
 227         this.$refs["board"].resetCurrentAttempt();
 228       let analyseBtn = document.getElementById("analyzeBtn");
 229       if (!!analyseBtn) analyseBtn.classList.remove("active");
 230       const parsedFen = V.ParseFen(game.fenStart);
 231       const firstMoveColor = parsedFen.turn;
 232       this.firstMoveNumber = Math.floor(parsedFen.movesCount / 2) + 1;
 233       let L = this.moves.length;
 234       this.moves.forEach((move,idx) => {
 235         // Strategy working also for multi-moves:
 236         if (!Array.isArray(move)) move = [move];
 237         move.forEach(m => {
 238           m.notation = this.vr.getNotation(m);
 239           m.unambiguous = V.GetUnambiguousNotation(m);
 240           this.vr.play(m);
 241         });
 242         const Lm = move.length;
 243         move[Lm - 1].fen = this.vr.getFen();
 244         if (idx < L - 1 && this.vr.getCheckSquares().length > 0)
 245           move[Lm - 1].notation += "+";
 246       });
 247       this.incheck = this.vr.getCheckSquares();
 248       this.score = this.vr.getCurrentScore();
 249       if (L >= 1) {
 250         const move =
 251           !Array.isArray(this.moves[L - 1])
 252             ? [this.moves[L - 1]]
 253             : this.moves[L - 1];
 254         const Lm = move.length;
 255         if (["1-0", "0-1"].includes(this.score)) move[Lm - 1].notation += "#";
 256         else if (this.incheck.length > 0) move[Lm - 1].notation += "+";
 257       }
 258       if (this.score != '*') {
 259         // Show score on screen
 260         const message = getScoreMessage(this.score);
 261         this.showEndgameMsg(this.score + " . " + this.st.tr[message]);
 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.$emit("fenchange", fen);
 432       }
 433     },
 434     clickSquare: function(square) {
 435       // Some variants make use of a single click at specific times:
 436       const move_s = this.vr.doClick(square);
 437       if (!!move_s) {
 438         const playMove = () => {
 439           if (!Array.isArray(move_s)) this.play(move_s);
 440           else this.$refs["board"].choices = move_s;
 441         }
 442         if ("ontouchstart" in window) {
 443           const squareId = "sq-" + square[0] + "-" + square[1];
 444           const highlight = function(on, sq) {
 445             let elt = document.getElementById(sq);
 446             if (!!elt) {
 447               if (on) elt.classList.add("touch-hover");
 448               else elt.classList.remove("touch-hover");
 449             }
 450           }
 451           // Touch screen (smartphone): require confirmation
 452           const squareStr = square[0] + "_" + square[1]
 453           if (this.touchLastClick == squareId) {
 454             highlight(false, squareId);
 455             playMove();
 456           }
 457           else {
 458             highlight(true, squareId);
 459             highlight(false, this.touchLastClick);
 460           }
 461           this.touchLastClick = squareId;
 462         }
 463         else playMove();
 464       }
 465     },
 466     // "light": if gotoMove() or gotoEnd()
 467     play: function(move, received, light, autoplay) {
 468       // Freeze while choices are shown:
 469       if (
 470         !!this.$refs["board"].selectedPiece ||
 471         this.$refs["board"].choices.length > 0
 472       ) {
 473         return;
 474       }
 475       const navigate = !move;
 476       // Forbid navigation during autoplay:
 477       if (navigate && this.autoplay && !autoplay) return;
 478       // Forbid playing outside analyze mode, except if move is received.
 479       // Sufficient condition because Board already knows which turn it is.
 480       if (
 481         this.mode != "analyze" &&
 482         !navigate &&
 483         !received &&
 484         (this.game.score != "*" || this.cursor < this.moves.length - 1)
 485       ) {
 486         return;
 487       }
 488       if (!!received) {
 489         if (this.autoplay || this.inPlay) {
 490           // Received moves while autoplaying are stacked,
 491           // and in observed games they could arrive too fast:
 492           this.stackToPlay.unshift(move);
 493           return;
 494         }
 495         if (this.mode == "analyze") this.toggleAnalyze();
 496         if (this.cursor < this.moves.length - 1)
 497           // To play a received move, cursor must be at the end of the game:
 498           this.gotoEnd();
 499         this.inPlay = true;
 500       }
 501       // The board may show some possible moves: (TODO: bad solution)
 502       this.$refs["board"].resetCurrentAttempt();
 503       const playSubmove = (smove) => {
 504         smove.notation = this.vr.getNotation(smove);
 505         smove.unambiguous = V.GetUnambiguousNotation(smove);
 506         this.vr.play(smove);
 507         if (this.inMultimove && !!this.lastMove) {
 508           if (!Array.isArray(this.lastMove))
 509             this.lastMove = [this.lastMove, smove];
 510           else this.lastMove.push(smove);
 511         }
 512         if (!this.inMultimove) {
 513           // First sub-move:
 514           this.lastMove = smove;
 515           // Condition is "!navigate" but we mean "!this.autoplay"
 516           if (!navigate) {
 517             if (this.cursor < this.moves.length - 1)
 518               this.moves = this.moves.slice(0, this.cursor + 1);
 519             this.moves.push(smove);
 520           }
 521           this.inMultimove = true; //potentially
 522           this.cursor++;
 523         }
 524         else if (!navigate) {
 525           // Already in the middle of a multi-move
 526           const L = this.moves.length;
 527           if (!Array.isArray(this.moves[L-1]))
 528             this.$set(this.moves, L-1, [this.moves[L-1], smove]);
 529           else this.moves[L-1].push(smove);
 530         }
 531       };
 532       const playMove = () => {
 533         const animate = (
 534           ["all", "highlight"].includes(V.ShowMoves) &&
 535           (this.autoplay || !!received)
 536         );
 537         if (!Array.isArray(move)) move = [move];
 538         let moveIdx = 0;
 539         let self = this;
 540         const initurn = this.vr.turn;
 541         (function executeMove() {
 542           const smove = move[moveIdx++];
 543           // NOTE: condition "smove.start.x >= 0" required for Dynamo,
 544           // because second move may be empty. noHighlight condition
 545           // is used at least for Chakart.
 546           if (animate && smove.start.x >= 0 && !smove.end.noHighlight) {
 547             self.animateMove(smove, () => {
 548               playSubmove(smove);
 549               if (moveIdx < move.length) setTimeout(executeMove, 500);
 550               else afterMove(smove, initurn);
 551             });
 552           }
 553           else {
 554             playSubmove(smove);
 555             if (moveIdx < move.length) executeMove();
 556             else afterMove(smove, initurn);
 557           }
 558         })();
 559       };
 560       const computeScore = () => {
 561         const score = this.vr.getCurrentScore();
 562         if (!navigate) {
 563           if (["1-0", "0-1"].includes(score)) {
 564             if (Array.isArray(this.lastMove)) {
 565               const L = this.lastMove.length;
 566               this.lastMove[L - 1].notation += "#";
 567             }
 568             else this.lastMove.notation += "#";
 569           }
 570         }
 571         if (score != "*" && ["analyze", "versus"].includes(this.mode)) {
 572           const message = getScoreMessage(score, V.ReverseColors);
 573           // Show score on screen
 574           this.showEndgameMsg(score + " . " + this.st.tr[message]);
 575         }
 576         return score;
 577       };
 578       const afterMove = (smove, initurn) => {
 579         if (this.vr.turn != initurn) {
 580           // Turn has changed: move is complete
 581           if (!smove.fen)
 582             // NOTE: only FEN of last sub-move is required (=> setting it here)
 583             smove.fen = this.vr.getFen();
 584           this.emitFenIfAnalyze();
 585           this.inMultimove = false;
 586           this.incheck = this.vr.getCheckSquares();
 587           if (this.incheck.length > 0) smove.notation += "+";
 588           this.score = computeScore();
 589           if (this.autoplay) {
 590             if (this.cursor < this.moves.length - 1)
 591               setTimeout(() => this.play(null, null, null, "autoplay"), 1000);
 592             else {
 593               this.autoplay = false;
 594               if (this.stackToPlay.length > 0)
 595                 // Move(s) arrived in-between
 596                 this.play(this.stackToPlay.pop(), "received");
 597             }
 598           }
 599           if (this.mode != "analyze" && !navigate) {
 600             if (!received) {
 601               // Post-processing (e.g. computer play).
 602               const L = this.moves.length;
 603               // NOTE: always emit the score, even in unfinished
 604               this.$emit("newmove", this.moves[L-1], { score: this.score });
 605             }
 606             else {
 607               this.inPlay = false;
 608               if (this.stackToPlay.length > 0)
 609                 // Move(s) arrived in-between
 610                 this.play(this.stackToPlay.pop(), "received");
 611             }
 612           }
 613         }
 614       };
 615       // NOTE: navigate and received are mutually exclusive
 616       if (navigate) {
 617         // The move to navigate to is necessarily full:
 618         if (this.cursor == this.moves.length - 1) return; //no more moves
 619         move = this.moves[this.cursor + 1];
 620         if (!this.autoplay) {
 621           // Just play the move:
 622           if (!Array.isArray(move)) move = [move];
 623           for (let i=0; i < move.length; i++) this.vr.play(move[i]);
 624           if (!light) {
 625             this.lastMove = move;
 626             this.incheck = this.vr.getCheckSquares();
 627             this.score = computeScore();
 628             this.emitFenIfAnalyze();
 629           }
 630           this.cursor++;
 631           return;
 632         }
 633       }
 634       playMove();
 635     },
 636     cancelCurrentMultimove: function() {
 637       const L = this.moves.length;
 638       let move = this.moves[L-1];
 639       if (!Array.isArray(move)) move = [move];
 640       for (let i = move.length - 1; i >= 0; i--) this.vr.undo(move[i]);
 641       this.moves.pop();
 642       this.cursor--;
 643       this.inMultimove = false;
 644     },
 645     cancelLastMove: function() {
 646       // The last played move was canceled (corr game)
 647       this.undo();
 648       this.moves.pop();
 649     },
 650     // "light": if gotoMove() or gotoBegin()
 651     undo: function(move, light) {
 652       if (
 653         this.autoplay ||
 654         !!this.$refs["board"].selectedPiece ||
 655         this.$refs["board"].choices.length > 0
 656       ) {
 657         return;
 658       }
 659       this.$refs["board"].resetCurrentAttempt();
 660       if (this.inMultimove) {
 661         this.cancelCurrentMultimove();
 662         this.incheck = this.vr.getCheckSquares();
 663         if (this.cursor >= 0) this.lastMove = this.moves[this.cursor];
 664         else this.lastMove = null;
 665       }
 666       else {
 667         if (!move) {
 668           const minCursor =
 669             this.moves.length > 0 && this.moves[0].notation == "..."
 670               ? 1
 671               : 0;
 672           if (this.cursor < minCursor) return; //no more moves
 673           move = this.moves[this.cursor];
 674         }
 675         this.$refs["board"].resetCurrentAttempt();
 676         undoMove(move, this.vr);
 677         if (light) this.cursor--;
 678         else {
 679           this.positionCursorTo(this.cursor - 1);
 680           this.incheck = this.vr.getCheckSquares();
 681           this.emitFenIfAnalyze();
 682         }
 683       }
 684     },
 685     gotoMove: function(index) {
 686       if (
 687         this.autoplay ||
 688         !!this.$refs["board"].selectedPiece ||
 689         this.$refs["board"].choices.length > 0
 690       ) {
 691         return;
 692       }
 693       this.$refs["board"].resetCurrentAttempt();
 694       if (this.inMultimove) this.cancelCurrentMultimove();
 695       if (index == this.cursor) return;
 696       if (index < this.cursor) {
 697         while (this.cursor > index)
 698           this.undo(null, null, "light");
 699       }
 700       else {
 701         // index > this.cursor)
 702         while (this.cursor < index)
 703           this.play(null, null, "light");
 704       }
 705       // NOTE: next line also re-assign cursor, but it's very light
 706       this.positionCursorTo(index);
 707       this.incheck = this.vr.getCheckSquares();
 708       this.emitFenIfAnalyze();
 709     },
 710     gotoBegin: function() {
 711       if (
 712         this.autoplay ||
 713         !!this.$refs["board"].selectedPiece ||
 714         this.$refs["board"].choices.length > 0
 715       ) {
 716         return;
 717       }
 718       this.$refs["board"].resetCurrentAttempt();
 719       if (this.inMultimove) this.cancelCurrentMultimove();
 720       const minCursor =
 721         this.moves.length > 0 && this.moves[0].notation == "..."
 722           ? 1
 723           : 0;
 724       while (this.cursor >= minCursor) this.undo(null, null, "light");
 725       this.lastMove = (minCursor == 1 ? this.moves[0] : null);
 726       this.incheck = this.vr.getCheckSquares();
 727       this.emitFenIfAnalyze();
 728     },
 729     gotoEnd: function() {
 730       if (this.cursor == this.moves.length - 1) return;
 731       this.gotoMove(this.moves.length - 1);
 732     },
 733     flip: function() {
 734       if (this.$refs["board"].choices.length > 0) return;
 735       this.orientation = V.GetOppCol(this.orientation);
 736     }
 737   }
 738 };
 739 </script>
 740
 741 <style lang="sass" scoped>
 742 [type="checkbox"]#modalEog+div .card
 743   min-height: 45px
 744   max-width: 350px
 745
 746 #baseGame
 747   width: 100%
 748   &:focus
 749     outline: none
 750
 751 #gameContainer
 752   margin-left: auto
 753   margin-right: auto
 754
 755 #downloadDiv
 756   display: inline-block
 757
 758 #controls
 759   user-select: none
 760   button
 761     border: none
 762     margin: 0
 763     padding-top: 5px
 764     padding-bottom: 5px
 765
 766 p#fenAnalyze
 767   margin: 5px
 768
 769 .in-autoplay
 770   background-color: #FACF8C
 771
 772 img.inline
 773   height: 22px
 774   padding-top: 5px
 775   @media screen and (max-width: 767px)
 776     height: 18px
 777
 778 #turnIndicator
 779   text-align: center
 780   font-weight: bold
 781
 782 #boardContainer
 783   float: left
 784 // TODO: later, maybe, allow movesList of variable width
 785 // or e.g. between 250 and 350px (but more complicated)
 786
 787 #movesList
 788   width: 280px
 789   float: left
 790
 791 @media screen and (max-width: 767px)
 792   #movesList
 793     width: 100%
 794     float: none
 795     clear: both
 796 </style>