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import { isArraysEqual } from '../util/array'
export interface MemoizedRendering<ArgsType extends any[]> {
(...args: ArgsType): void
unrender: () => void
dependents: MemoizedRendering<any>[]
}
export function memoizeRendering<ArgsType extends any[]>(
renderFunc: (...args: ArgsType) => void,
unrenderFunc?: (...args: ArgsType) => void,
dependencies: MemoizedRendering<any>[] = []
): MemoizedRendering<ArgsType> {
let dependents: MemoizedRendering<any>[] = []
let thisContext
let prevArgs
function unrender() {
if (prevArgs) {
for (let dependent of dependents) {
dependent.unrender()
}
if (unrenderFunc) {
unrenderFunc.apply(thisContext, prevArgs)
}
prevArgs = null
}
}
function res() {
if (!prevArgs || !isArraysEqual(prevArgs, arguments)) {
unrender()
thisContext = this
prevArgs = arguments
renderFunc.apply(this, arguments)
}
}
res.dependents = dependents
res.unrender = unrender
for (let dependency of dependencies) {
dependency.dependents.push(res)
}
return res
}