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import {
getRenderedCell,
RenderedCell,
RenderedGrid,
} from "./components/grid/renderGrid";
import { CellRef, cellRefEquals } from "./types";
export abstract class Selection {
readonly gridId: string;
readonly activeCellRef: CellRef;
constructor(gridId: string, activeCellRef: CellRef) {
this.gridId = gridId;
this.activeCellRef = activeCellRef;
}
abstract extend(cellRef: CellRef): Selection;
abstract getSelectedCells(grid: RenderedGrid): RenderedCell[][];
abstract startCellRef(): CellRef;
abstract endCellRef(): CellRef;
}
export class ActiveCellSelection extends Selection {
extend(cellRef: CellRef): Selection {
if (cellRefEquals(cellRef, this.activeCellRef)) {
return this;
}
return new RangeSelection(this.gridId, this.activeCellRef, [
this.activeCellRef,
cellRef,
]);
}
getSelectedCells(grid: RenderedGrid): RenderedCell[][] {
return [[getRenderedCell(grid, this.activeCellRef)!]];
}
startCellRef(): CellRef {
return this.activeCellRef;
}
endCellRef(): CellRef {
return this.activeCellRef;
}
}
export type CellRange = [CellRef, CellRef];
export class RangeSelection extends Selection {
#range: CellRange;
get range() {
return this.#range;
}
constructor(gridId: string, activeCellRef: CellRef, range: CellRange) {
super(gridId, activeCellRef);
this.#range = range;
}
extend(cellRef: CellRef): Selection {
if (cellRefEquals(cellRef, this.activeCellRef)) {
return new ActiveCellSelection(this.gridId, cellRef);
}
return new RangeSelection(this.gridId, this.activeCellRef, [
this.#range[0],
cellRef,
]);
}
getSelectedCells(grid: RenderedGrid): RenderedCell[][] {
const startCell = getRenderedCell(grid, this.range[0]);
const endCell = getRenderedCell(grid, this.range[1]);
if (!startCell || !endCell) return [];
const firstRowIndex = Math.min(
startCell.renderedRowIndex,
endCell.renderedRowIndex,
);
const lastRowIndex = Math.max(
startCell.renderedRowIndex,
endCell.renderedRowIndex,
);
const startRatio =
startCell.startRatio.compare(endCell.startRatio) <= 0
? startCell.startRatio
: endCell.startRatio;
const endRatio =
startCell.endRatio.compare(endCell.endRatio) >= 0
? startCell.endRatio
: endCell.endRatio;
return grid.renderedRows
.slice(firstRowIndex, lastRowIndex + 1)
.map((row) => {
const firstCellIndex = row.renderedCells.findIndex(
(cell) => cell.startRatio.compare(startRatio) >= 0,
);
const lastCellIndex = row.renderedCells.findLastIndex(
(cell) => cell.endRatio.compare(endRatio) <= 0,
);
return row.renderedCells.slice(firstCellIndex, lastCellIndex + 1);
});
}
startCellRef(): CellRef {
return this.range[0];
}
endCellRef(): CellRef {
return this.range[1];
}
}
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