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import { CellRef } from "../../types";
import excursion from "./excursion";
import { getRenderedCell, RenderedCell, RenderedGrid } from "./renderGrid";
import { GridSelection } from "./selection";
export interface SelectionStyles {
activeCellStroke: string;
selectionRangeFill: string;
selectionRangeStroke: string;
}
function strokeActiveCell(
ctx: CanvasRenderingContext2D,
styles: SelectionStyles,
grid: RenderedGrid,
cell: RenderedCell,
) {
excursion(ctx, () => {
const isLastCell = cell.rect.bottomRight.x === grid.rect.bottomRight.x;
const isLastRow = cell.rect.bottomRight.y === grid.rect.bottomRight.y;
ctx.strokeStyle = styles.activeCellStroke;
ctx.lineWidth = 2;
ctx.strokeRect(
cell.rect.topLeft.x + 1,
cell.rect.topLeft.y + 1,
isLastCell ? cell.rect.width - 2 : cell.rect.width - 1,
isLastRow ? cell.rect.height - 2 : cell.rect.height - 1,
);
});
}
function drawCellRange(
ctx: CanvasRenderingContext2D,
styles: SelectionStyles,
grid: RenderedGrid,
start: CellRef,
end: CellRef,
{ stroke }: { stroke: boolean },
) {
excursion(ctx, () => {
const startCell = getRenderedCell(grid, start);
const endCell = getRenderedCell(grid, end);
if (!startCell || !endCell) return;
const rect = startCell.rect.extend(endCell.rect);
const isRightEdge = rect.bottomRight.x === grid.rect.bottomRight.x;
const isBottomEdge = rect.bottomRight.y === grid.rect.bottomRight.y;
ctx.fillStyle = styles.selectionRangeFill;
ctx.fillRect(
rect.topLeft.x + 1,
rect.topLeft.y + 1,
isRightEdge ? rect.width - 2 : rect.width - 1,
isBottomEdge ? rect.height - 2 : rect.height - 1,
);
if (!stroke) return;
ctx.strokeStyle = styles.selectionRangeStroke;
ctx.strokeRect(
rect.topLeft.x + 0.5,
rect.topLeft.y + 0.5,
isRightEdge ? rect.width - 1 : rect.width,
isBottomEdge ? rect.height - 1 : rect.height,
);
});
}
export default function drawSelection(
ctx: CanvasRenderingContext2D,
styles: SelectionStyles,
grid: RenderedGrid,
selection: GridSelection | undefined,
{ pending }: { pending: boolean },
) {
ctx.clearRect(0, 0, grid.rect.width, grid.rect.height);
if (!selection) return;
const activeCell = getRenderedCell(grid, selection.activeCellRef);
if (!activeCell) return;
if (selection.range) {
drawCellRange(ctx, styles, grid, selection.range[0], selection.range[1], {
stroke: !pending,
});
}
strokeActiveCell(ctx, styles, grid, activeCell);
}
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