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96 lines
2.3 KiB
96 lines
2.3 KiB
3 years ago
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/* @flow */
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import {
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warn,
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invokeWithErrorHandling
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} from 'core/util/index'
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import {
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cached,
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isUndef,
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isTrue,
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isPlainObject
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} from 'shared/util'
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const normalizeEvent = cached((name: string): {
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name: string,
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once: boolean,
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capture: boolean,
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passive: boolean,
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handler?: Function,
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params?: Array<any>
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} => {
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const passive = name.charAt(0) === '&'
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name = passive ? name.slice(1) : name
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const once = name.charAt(0) === '~' // Prefixed last, checked first
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name = once ? name.slice(1) : name
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const capture = name.charAt(0) === '!'
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name = capture ? name.slice(1) : name
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return {
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name,
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once,
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capture,
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passive
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}
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})
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export function createFnInvoker (fns: Function | Array<Function>, vm: ?Component): Function {
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function invoker () {
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const fns = invoker.fns
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if (Array.isArray(fns)) {
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const cloned = fns.slice()
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for (let i = 0; i < cloned.length; i++) {
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invokeWithErrorHandling(cloned[i], null, arguments, vm, `v-on handler`)
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}
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} else {
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// return handler return value for single handlers
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return invokeWithErrorHandling(fns, null, arguments, vm, `v-on handler`)
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}
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}
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invoker.fns = fns
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return invoker
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}
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export function updateListeners (
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on: Object,
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oldOn: Object,
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add: Function,
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remove: Function,
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createOnceHandler: Function,
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vm: Component
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) {
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let name, def, cur, old, event
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for (name in on) {
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def = cur = on[name]
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old = oldOn[name]
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event = normalizeEvent(name)
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/* istanbul ignore if */
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if (__WEEX__ && isPlainObject(def)) {
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cur = def.handler
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event.params = def.params
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}
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if (isUndef(cur)) {
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process.env.NODE_ENV !== 'production' && warn(
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`Invalid handler for event "${event.name}": got ` + String(cur),
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vm
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)
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} else if (isUndef(old)) {
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if (isUndef(cur.fns)) {
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cur = on[name] = createFnInvoker(cur, vm)
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}
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if (isTrue(event.once)) {
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cur = on[name] = createOnceHandler(event.name, cur, event.capture)
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}
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add(event.name, cur, event.capture, event.passive, event.params)
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} else if (cur !== old) {
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old.fns = cur
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on[name] = old
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}
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}
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for (name in oldOn) {
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if (isUndef(on[name])) {
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event = normalizeEvent(name)
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remove(event.name, oldOn[name], event.capture)
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}
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}
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}
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