@lichess-org/chessground
Version:
lichess.org chess ui
238 lines • 10.1 kB
JavaScript
import { key2pos, createEl, posToTranslate as posToTranslateFromBounds, translate, setVisible, } from './util.js';
import * as util from './util.js';
import { whitePov } from './board.js';
// ported from https://github.com/lichess-org/lichobile/blob/master/src/chessground/render.ts
// in case of bugs, blame @veloce
export function render(s) {
const asWhite = whitePov(s), posToTranslate = posToTranslateFromBounds(s.dom.bounds()), boardEl = s.dom.elements.board, pieces = s.pieces, curAnim = s.animation.current, anims = curAnim ? curAnim.plan.anims : new Map(), fadings = curAnim ? curAnim.plan.fadings : new Map(), curDrag = s.draggable.current, samePieces = new Set(), movedPieces = new Map(), desiredSquares = computeSquareClasses(s), availableSquares = new Map(); // by class name
let k, el, pieceAtKey, elPieceName, anim, fading, pMvdset, pMvd, sAvail;
// walk over all board dom elements, apply animations and flag moved pieces
el = boardEl.firstChild;
while (el) {
k = el.cgKey;
if (isPieceNode(el)) {
pieceAtKey = pieces.get(k);
anim = anims.get(k);
fading = fadings.get(k);
elPieceName = el.cgPiece;
// if piece not being dragged anymore, remove dragging style
if (el.cgDragging && (!curDrag || curDrag.orig !== k)) {
el.classList.remove('dragging');
translate(el, posToTranslate(key2pos(k), asWhite));
el.cgDragging = false;
}
// remove fading class if it still remains
if (!fading && el.cgFading) {
el.cgFading = false;
el.classList.remove('fading');
}
// there is now a piece at this dom key
if (pieceAtKey) {
// continue animation if already animating and same piece
// (otherwise it could animate a captured piece)
if (anim && el.cgAnimating && elPieceName === pieceNameOf(pieceAtKey)) {
const pos = key2pos(k);
pos[0] += anim[2];
pos[1] += anim[3];
el.classList.add('anim');
translate(el, posToTranslate(pos, asWhite));
}
else if (el.cgAnimating) {
el.cgAnimating = false;
el.classList.remove('anim');
translate(el, posToTranslate(key2pos(k), asWhite));
if (s.addPieceZIndex)
el.style.zIndex = posZIndex(key2pos(k), asWhite);
}
// same piece: flag as same
if (elPieceName === pieceNameOf(pieceAtKey) && (!fading || !el.cgFading))
samePieces.add(k);
// different piece: flag as moved unless it is a fading piece
else if (fading && elPieceName === pieceNameOf(fading)) {
el.classList.add('fading');
el.cgFading = true;
}
else
appendValue(movedPieces, elPieceName, el);
}
// no piece: flag as moved
else
appendValue(movedPieces, elPieceName, el);
}
else if (isSquareNode(el)) {
const cls = el.className;
if (desiredSquares.get(k) === cls) {
setVisible(el, true);
desiredSquares.delete(k);
}
else
appendValue(availableSquares, cls, el);
}
el = el.nextSibling;
}
// walk over all squares in current set, apply dom changes to moved squares
// or append new squares
for (const [sk, className] of desiredSquares) {
sAvail = availableSquares.get(className)?.pop();
const translation = posToTranslate(key2pos(sk), asWhite);
if (sAvail) {
// repurpose an available square
sAvail.cgKey = sk;
if (s.jsHover)
sAvail.dataset['key'] = sk;
translate(sAvail, translation);
setVisible(sAvail, true);
}
else {
const squareNode = createEl('square', className);
squareNode.cgKey = sk;
if (s.jsHover)
squareNode.dataset['key'] = sk;
translate(squareNode, translation);
boardEl.insertBefore(squareNode, boardEl.firstChild);
}
}
// hide remaining available, therefore unused, squares
for (const [, nodes] of availableSquares.entries()) {
for (const node of nodes)
setVisible(node, false);
}
// walk over all pieces in current set, apply dom changes to moved pieces
// or append new pieces
for (const [k, p] of pieces) {
anim = anims.get(k);
if (!samePieces.has(k)) {
pMvdset = movedPieces.get(pieceNameOf(p));
pMvd = pMvdset && pMvdset.pop();
// a same piece was moved
if (pMvd) {
// apply dom changes
pMvd.cgKey = k;
if (pMvd.cgFading) {
pMvd.classList.remove('fading');
pMvd.cgFading = false;
}
const pos = key2pos(k);
if (s.addPieceZIndex)
pMvd.style.zIndex = posZIndex(pos, asWhite);
if (anim) {
pMvd.cgAnimating = true;
pMvd.classList.add('anim');
pos[0] += anim[2];
pos[1] += anim[3];
}
translate(pMvd, posToTranslate(pos, asWhite));
}
// no piece in moved obj: insert the new piece
// assumes the new piece is not being dragged
else {
const pieceName = pieceNameOf(p), pieceNode = createEl('piece', pieceName), pos = key2pos(k);
pieceNode.cgPiece = pieceName;
pieceNode.cgKey = k;
if (anim) {
pieceNode.cgAnimating = true;
pos[0] += anim[2];
pos[1] += anim[3];
}
translate(pieceNode, posToTranslate(pos, asWhite));
if (s.addPieceZIndex)
pieceNode.style.zIndex = posZIndex(pos, asWhite);
boardEl.appendChild(pieceNode);
}
}
}
// remove any piece that remains in the moved sets
for (const nodes of movedPieces.values())
removeNodes(s, nodes);
}
export function renderResized(s) {
const asWhite = whitePov(s), posToTranslate = posToTranslateFromBounds(s.dom.bounds());
let el = s.dom.elements.board.firstChild;
while (el) {
if ((isPieceNode(el) && !el.cgAnimating) || isSquareNode(el)) {
translate(el, posToTranslate(key2pos(el.cgKey), asWhite));
}
el = el.nextSibling;
}
}
export function updateBounds(s) {
const bounds = s.dom.elements.wrap.getBoundingClientRect();
const container = s.dom.elements.container;
const ratio = bounds.height / bounds.width;
const width = (Math.floor((bounds.width * window.devicePixelRatio) / 8) * 8) / window.devicePixelRatio;
const height = width * ratio;
container.style.width = width + 'px';
container.style.height = height + 'px';
s.dom.bounds.clear();
s.addDimensionsCssVarsTo?.style.setProperty('---cg-width', width + 'px');
s.addDimensionsCssVarsTo?.style.setProperty('---cg-height', height + 'px');
}
const isPieceNode = (el) => el.tagName === 'PIECE';
const isSquareNode = (el) => el.tagName === 'SQUARE';
function removeNodes(s, nodes) {
for (const node of nodes)
s.dom.elements.board.removeChild(node);
}
function posZIndex(pos, asWhite) {
const minZ = 3;
const rank = pos[1];
const z = asWhite ? minZ + 7 - rank : minZ + rank;
return `${z}`;
}
const pieceNameOf = (piece) => `${piece.color} ${piece.role}`;
const normalizeLastMoveStandardRookCastle = (s, k) => !!s.lastMove?.[1] &&
!s.pieces.has(s.lastMove[1]) &&
s.lastMove[0][0] === 'e' &&
['h', 'a'].includes(s.lastMove[1][0]) &&
s.lastMove[0][1] === s.lastMove[1][1] &&
util.squaresBetween(...key2pos(s.lastMove[0]), ...key2pos(s.lastMove[1])).some(sq => s.pieces.has(sq))
? ((k > s.lastMove[0] ? 'g' : 'c') + k[1])
: k;
function computeSquareClasses(s) {
const squares = new Map();
if (s.lastMove && s.highlight.lastMove)
for (const [i, k] of s.lastMove.entries())
addSquare(squares, i === 1 ? normalizeLastMoveStandardRookCastle(s, k) : k, 'last-move');
if (s.check && s.highlight.check)
addSquare(squares, s.check, 'check');
if (s.selected) {
addSquare(squares, s.selected, 'selected');
if (s.movable.showDests) {
for (const k of s.movable.dests?.get(s.selected) ?? [])
addSquare(squares, k, 'move-dest' + (s.pieces.has(k) ? ' oc' : ''));
for (const k of s.premovable.customDests?.get(s.selected) ?? s.premovable.dests ?? [])
addSquare(squares, k, 'premove-dest' + (s.pieces.has(k) ? ' oc' : ''));
}
}
const premove = s.premovable.current;
if (premove)
for (const k of premove)
addSquare(squares, k, 'current-premove');
else if (s.predroppable.current)
addSquare(squares, s.predroppable.current.key, 'current-premove');
const o = s.exploding;
if (o)
for (const k of o.keys)
addSquare(squares, k, 'exploding' + o.stage);
if (s.highlight.custom) {
s.highlight.custom.forEach((v, k) => {
addSquare(squares, k, v);
});
}
return squares;
}
function addSquare(squares, key, klass) {
const classes = squares.get(key);
if (classes)
squares.set(key, `${classes} ${klass}`);
else
squares.set(key, klass);
}
function appendValue(map, key, value) {
const arr = map.get(key);
if (arr)
arr.push(value);
else
map.set(key, [value]);
}
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