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8.3 KiB
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1 line
8.3 KiB
Plaintext
{"version":3,"sources":["../src/index.ts"],"sourcesContent":["import type {\n FrameFn,\n FrameUpdateFn,\n NativeRaf,\n Rafz,\n Timeout,\n Throttled,\n} from './types'\n\nexport type { FrameFn, FrameUpdateFn, Timeout, Throttled, Rafz }\n\nlet updateQueue = makeQueue<FrameUpdateFn>()\n\n/**\n * Schedule an update for next frame.\n * Your function can return `true` to repeat next frame.\n */\nexport const raf: Rafz = fn => schedule(fn, updateQueue)\n\nlet writeQueue = makeQueue<FrameFn>()\nraf.write = fn => schedule(fn, writeQueue)\n\nlet onStartQueue = makeQueue<FrameFn>()\nraf.onStart = fn => schedule(fn, onStartQueue)\n\nlet onFrameQueue = makeQueue<FrameFn>()\nraf.onFrame = fn => schedule(fn, onFrameQueue)\n\nlet onFinishQueue = makeQueue<FrameFn>()\nraf.onFinish = fn => schedule(fn, onFinishQueue)\n\nlet timeouts: Timeout[] = []\nraf.setTimeout = (handler, ms) => {\n const time = raf.now() + ms\n const cancel = () => {\n const i = timeouts.findIndex(t => t.cancel == cancel)\n if (~i) timeouts.splice(i, 1)\n pendingCount -= ~i ? 1 : 0\n }\n\n const timeout: Timeout = { time, handler, cancel }\n timeouts.splice(findTimeout(time), 0, timeout)\n pendingCount += 1\n\n start()\n return timeout\n}\n\n/** Find the index where the given time is not greater. */\nconst findTimeout = (time: number) =>\n ~(~timeouts.findIndex(t => t.time > time) || ~timeouts.length)\n\nraf.cancel = fn => {\n onStartQueue.delete(fn)\n onFrameQueue.delete(fn)\n onFinishQueue.delete(fn)\n updateQueue.delete(fn)\n writeQueue.delete(fn)\n}\n\nraf.sync = fn => {\n sync = true\n raf.batchedUpdates(fn)\n sync = false\n}\n\nraf.throttle = fn => {\n let lastArgs: any\n function queuedFn() {\n try {\n fn(...lastArgs)\n } finally {\n lastArgs = null\n }\n }\n function throttled(...args: any) {\n lastArgs = args\n raf.onStart(queuedFn)\n }\n throttled.handler = fn\n throttled.cancel = () => {\n onStartQueue.delete(queuedFn)\n lastArgs = null\n }\n return throttled as any\n}\n\nlet nativeRaf =\n typeof window != 'undefined'\n ? (window.requestAnimationFrame as NativeRaf)\n : // eslint-disable-next-line @typescript-eslint/no-empty-function\n () => {}\n\nraf.use = impl => (nativeRaf = impl)\nraf.now = typeof performance != 'undefined' ? () => performance.now() : Date.now\nraf.batchedUpdates = fn => fn()\nraf.catch = console.error\n\nraf.frameLoop = 'always'\n\nraf.advance = () => {\n if (raf.frameLoop !== 'demand') {\n console.warn(\n 'Cannot call the manual advancement of rafz whilst frameLoop is not set as demand'\n )\n } else {\n update()\n }\n}\n\n/** The most recent timestamp. */\nlet ts = -1\n\n/** The number of pending tasks */\nlet pendingCount = 0\n\n/** When true, scheduling is disabled. */\nlet sync = false\n\nfunction schedule<T extends Function>(fn: T, queue: Queue<T>) {\n if (sync) {\n queue.delete(fn)\n fn(0)\n } else {\n queue.add(fn)\n start()\n }\n}\n\nfunction start() {\n if (ts < 0) {\n ts = 0\n if (raf.frameLoop !== 'demand') {\n nativeRaf(loop)\n }\n }\n}\n\nfunction stop() {\n ts = -1\n}\n\nfunction loop() {\n if (~ts) {\n nativeRaf(loop)\n raf.batchedUpdates(update)\n }\n}\n\nfunction update() {\n const prevTs = ts\n ts = raf.now()\n\n // Flush timeouts whose time is up.\n const count = findTimeout(ts)\n if (count) {\n eachSafely(timeouts.splice(0, count), t => t.handler())\n pendingCount -= count\n }\n\n if (!pendingCount) {\n stop()\n\n return\n }\n\n onStartQueue.flush()\n updateQueue.flush(prevTs ? Math.min(64, ts - prevTs) : 16.667)\n onFrameQueue.flush()\n writeQueue.flush()\n onFinishQueue.flush()\n}\n\ninterface Queue<T extends Function = any> {\n add: (fn: T) => void\n delete: (fn: T) => boolean\n flush: (arg?: any) => void\n}\n\nfunction makeQueue<T extends Function>(): Queue<T> {\n let next = new Set<T>()\n let current = next\n return {\n add(fn) {\n pendingCount += current == next && !next.has(fn) ? 1 : 0\n next.add(fn)\n },\n delete(fn) {\n pendingCount -= current == next && next.has(fn) ? 1 : 0\n return next.delete(fn)\n },\n flush(arg) {\n if (current.size) {\n next = new Set()\n pendingCount -= current.size\n eachSafely(current, fn => fn(arg) && next.add(fn))\n pendingCount += next.size\n current = next\n }\n },\n }\n}\n\ninterface Eachable<T> {\n forEach(cb: (value: T) => void): void\n}\n\nfunction eachSafely<T>(values: Eachable<T>, each: (value: T) => void) {\n values.forEach(value => {\n try {\n each(value)\n } catch (e) {\n raf.catch(e as Error)\n }\n })\n}\n\n/** Tree-shakable state for testing purposes */\nexport const __raf = {\n /** The number of pending tasks */\n count(): number {\n return pendingCount\n },\n /** Whether there's a raf update loop running */\n isRunning(): boolean {\n return ts >= 0\n },\n /** Clear internal state. 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