75 lines
1.9 KiB
TypeScript
75 lines
1.9 KiB
TypeScript
import { current } from "immer"
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import { ShapeUtil, Bounds, Data, Shapes } from "types"
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import BaseSession from "./base-session"
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import shapes, { getShapeUtils } from "lib/shape-utils"
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import { getBoundsFromPoints } from "utils/utils"
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import * as vec from "utils/vec"
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interface BrushSnapshot {
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selectedIds: Set<string>
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shapes: { id: string; test: (bounds: Bounds) => boolean }[]
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}
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export default class BrushSession extends BaseSession {
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origin: number[]
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snapshot: BrushSnapshot
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constructor(data: Data, point: number[]) {
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super(data)
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this.origin = vec.round(point)
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this.snapshot = BrushSession.getSnapshot(data)
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}
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update = (data: Data, point: number[]) => {
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const { origin, snapshot } = this
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const brushBounds = getBoundsFromPoints([origin, point])
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for (let { test, id } of snapshot.shapes) {
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if (test(brushBounds)) {
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data.selectedIds.add(id)
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} else if (data.selectedIds.has(id)) {
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data.selectedIds.delete(id)
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}
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}
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data.brush = brushBounds
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}
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cancel = (data: Data) => {
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data.brush = undefined
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data.selectedIds = new Set(this.snapshot.selectedIds)
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}
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complete = (data: Data) => {
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data.brush = undefined
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}
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/**
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* Get a snapshot of the current selected ids, for each shape that is
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* not already selected, the shape's id and a test to see whether the
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* brush will intersect that shape. For tests, start broad -> fine.
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* @param data
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* @returns
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*/
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static getSnapshot(data: Data): BrushSnapshot {
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const {
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selectedIds,
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document: { pages },
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currentPageId,
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} = current(data)
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return {
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selectedIds: new Set(data.selectedIds),
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shapes: Object.values(pages[currentPageId].shapes)
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.filter((shape) => !selectedIds.has(shape.id))
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.map((shape) => ({
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id: shape.id,
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test: (brushBounds: Bounds): boolean =>
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getShapeUtils(shape).hitTestBounds(shape, brushBounds),
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})),
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}
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}
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}
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