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import { Cell, CellKey, parseCellKey } from "./attributes"; |
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import { TableState } from "./store"; |
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|
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function getSpan(cells: Record<CellKey, Cell>, coord: CellKey) { |
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return ( |
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cells[coord]?.span || { |
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rowSpan: 1, |
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colSpan: 1, |
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} |
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); |
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} |
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|
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export function areAllMergeable( |
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coords: Array<CellKey>, |
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cells: Record<CellKey, Cell> |
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): boolean { |
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if (coords.length < 2) return false; |
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|
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const occupiedGrid = new Set<string>(); |
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for (const coord of coords) { |
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const [r, c] = parseCellKey(coord); |
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const span = getSpan(cells, coord); |
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for (let rs = 0; rs < span.rowSpan; rs++) { |
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for (let cs = 0; cs < span.colSpan; cs++) { |
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occupiedGrid.add(`${r + rs},${c + cs}`); |
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} |
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} |
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} |
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|
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let minRow = Infinity, |
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maxRow = -Infinity; |
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let minCol = Infinity, |
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maxCol = -Infinity; |
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|
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for (const key of occupiedGrid) { |
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const [r, c] = key.split(",").map(Number); |
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minRow = Math.min(minRow, r); |
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maxRow = Math.max(maxRow, r); |
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minCol = Math.min(minCol, c); |
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maxCol = Math.max(maxCol, c); |
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} |
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|
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for (let r = minRow; r <= maxRow; r++) { |
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for (let c = minCol; c <= maxCol; c++) { |
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if (!occupiedGrid.has(`${r},${c}`)) { |
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return false; |
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} |
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} |
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} |
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|
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return true; |
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} |
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|
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export function mergeCells(coords: Array<CellKey>, state: TableState): void { |
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if (coords.length < 2) return; |
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|
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if (!areAllMergeable(coords, state.cells)) { |
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console.warn("Cells are not mergeable"); |
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return; |
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} |
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|
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const sorted = [...coords].sort((a, b) => { |
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const [aRow, aCol] = parseCellKey(a); |
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const [bRow, bCol] = parseCellKey(b); |
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return aRow === bRow ? aCol - bCol : aRow - bRow; |
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}); |
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const topLeft = sorted[0]; |
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const [topLeftRow, topLeftCol] = parseCellKey(topLeft); |
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|
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let minRow = topLeftRow; |
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let maxRow = topLeftRow; |
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let minCol = topLeftCol; |
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let maxCol = topLeftCol; |
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|
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for (const coord of coords) { |
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const [r, c] = parseCellKey(coord); |
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const span = getSpan(state.cells, coord); |
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minRow = Math.min(minRow, r); |
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maxRow = Math.max(maxRow, r + span.rowSpan - 1); |
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minCol = Math.min(minCol, c); |
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maxCol = Math.max(maxCol, c + span.colSpan - 1); |
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} |
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|
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const newRowSpan = maxRow - minRow + 1; |
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const newColSpan = maxCol - minCol + 1; |
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const coordSet = new Set(coords); |
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const nextCells = { ...state.cells }; |
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|
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Object.keys(nextCells).forEach(key => { |
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if (coordSet.has(key as CellKey) && key !== topLeft) { |
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delete nextCells[key as CellKey]; |
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} |
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}); |
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|
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nextCells[topLeft] = { |
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...(nextCells[topLeft] || {}), |
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span: { rowSpan: newRowSpan, colSpan: newColSpan }, |
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}; |
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|
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state.setCells(nextCells); |
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state.setSelectedCells([topLeft]); |
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} |
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|
