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fix: further adjust nextTick strategy
fix #6813
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /* @flow */ | ||
| /* globals MessageChannel */ | ||
|
|
||
| import { noop } from 'shared/util' | ||
| import { handleError } from './error' | ||
| import { isIOS, isNative } from './env' | ||
|
|
||
| const callbacks = [] | ||
| let pending = false | ||
|
|
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| function flushCallbacks () { | ||
| pending = false | ||
| const copies = callbacks.slice(0) | ||
| callbacks.length = 0 | ||
| for (let i = 0; i < copies.length; i++) { | ||
| copies[i]() | ||
| } | ||
| } | ||
|
|
||
| // Here we have async deferring wrappers using both micro and macro tasks. | ||
| // In < 2.4 we used micro tasks everywhere, but there are some scenarios where | ||
| // micro tasks have too high a priority and fires in between supposedly | ||
| // sequential events (e.g. #4521, #6690) or even between bubbling of the same | ||
| // event (#6566). However, using macro tasks everywhere also has subtle problems | ||
| // when state is changed right before repaint (e.g. #6813, out-in transitions). | ||
| // Here we use micro task by default, but expose a way to force macro task when | ||
| // needed (e.g. in event handlers attached by v-on). | ||
| let microTimerFunc | ||
| let macroTimerFunc | ||
| let useMacroTask = false | ||
|
|
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| // Determine (macro) Task defer implementation. | ||
| // Technically setImmediate should be the ideal choice, but it's only available | ||
| // in IE. The only polyfill that consistently queues the callback after all DOM | ||
| // events triggered in the same loop is by using MessageChannel. | ||
| /* istanbul ignore if */ | ||
| if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) { | ||
| macroTimerFunc = () => { | ||
| setImmediate(flushCallbacks) | ||
| } | ||
| } else if (typeof MessageChannel !== 'undefined' && ( | ||
| isNative(MessageChannel) || | ||
| // PhantomJS | ||
| MessageChannel.toString() === '[object MessageChannelConstructor]' | ||
| )) { | ||
| const channel = new MessageChannel() | ||
| const port = channel.port2 | ||
| channel.port1.onmessage = flushCallbacks | ||
| macroTimerFunc = () => { | ||
| port.postMessage(1) | ||
| } | ||
| } else { | ||
| macroTimerFunc = () => { | ||
| setTimeout(flushCallbacks, 0) | ||
| } | ||
| } | ||
|
|
||
| // Determine MicroTask defer implementation. | ||
| // $flow-disable-line, istanbul ignore next | ||
| if (typeof Promise !== 'undefined' && isNative(Promise)) { | ||
| const p = Promise.resolve() | ||
| microTimerFunc = () => { | ||
| p.then(flushCallbacks) | ||
| // in problematic UIWebViews, Promise.then doesn't completely break, but | ||
| // it can get stuck in a weird state where callbacks are pushed into the | ||
| // microtask queue but the queue isn't being flushed, until the browser | ||
| // needs to do some other work, e.g. handle a timer. Therefore we can | ||
| // "force" the microtask queue to be flushed by adding an empty timer. | ||
| if (isIOS) setTimeout(noop) | ||
| } | ||
| } else { | ||
| // fallback to macro | ||
| microTimerFunc = macroTimerFunc | ||
| } | ||
|
|
||
| /** | ||
| * Wrap a function so that if any code inside triggers state change, | ||
| * the changes are queued using a Task instead of a MicroTask. | ||
| */ | ||
| export function withMacroTask (fn: Function): Function { | ||
| return fn._withTask || (fn._withTask = function () { | ||
| useMacroTask = true | ||
| const res = fn.apply(null, arguments) | ||
| useMacroTask = false | ||
| return res | ||
| }) | ||
| } | ||
|
|
||
| export function nextTick (cb?: Function, ctx?: Object): ?Promise { | ||
| let _resolve | ||
| callbacks.push(() => { | ||
| if (cb) { | ||
| try { | ||
| cb.call(ctx) | ||
| } catch (e) { | ||
| handleError(e, ctx, 'nextTick') | ||
| } | ||
| } else if (_resolve) { | ||
| _resolve(ctx) | ||
| } | ||
| }) | ||
| if (!pending) { | ||
| pending = true | ||
| if (useMacroTask) { | ||
| macroTimerFunc() | ||
| } else { | ||
| microTimerFunc() | ||
| } | ||
| } | ||
| // $flow-disable-line | ||
| if (!cb && typeof Promise !== 'undefined') { | ||
| return new Promise(resolve => { | ||
| _resolve = resolve | ||
| }) | ||
| } | ||
| } |
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