iczer
5 years ago
parent
9445f0fbbb
commit
d741904f50
6 changed files with 199 additions and 57 deletions
@ -0,0 +1,141 @@ |
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import {isDef, isRegExp, remove} from '@/utils/util' |
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const patternTypes = [String, RegExp, Array] |
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function matches (pattern, name) { |
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if (Array.isArray(pattern)) { |
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return pattern.indexOf(name) > -1 |
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} else if (typeof pattern === 'string') { |
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return pattern.split(',').indexOf(name) > -1 |
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} else if (isRegExp(pattern)) { |
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return pattern.test(name) |
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} |
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/* istanbul ignore next */ |
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return false |
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} |
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function getComponentName (opts) { |
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return opts && (opts.Ctor.options.name || opts.tag) |
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} |
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function getFirstComponentChild (children) { |
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if (Array.isArray(children)) { |
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for (let i = 0; i < children.length; i++) { |
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const c = children[i] |
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if (isDef(c) && (isDef(c.componentOptions) || c.isAsyncPlaceholder)) { |
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return c |
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} |
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} |
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} |
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} |
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function pruneCache (keepAliveInstance, filter) { |
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const { cache, keys, _vnode } = keepAliveInstance |
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for (const key in cache) { |
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const cachedNode = cache[key] |
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if (cachedNode) { |
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const name = getComponentName(cachedNode.componentOptions) |
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if (name && !filter(name)) { |
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pruneCacheEntry(cache, key, keys, _vnode) |
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} |
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} |
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} |
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} |
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function pruneCacheEntry (cache, key, keys, current) { |
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const cached = cache[key] |
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if (cached && (!current || cached.tag !== current.tag)) { |
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cached.componentInstance.$destroy() |
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} |
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cache[key] = null |
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remove(keys, key) |
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} |
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export default { |
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name: 'AKeepAlive', |
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abstract: true, |
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model: { |
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prop: 'clearCaches', |
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event: 'clear', |
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}, |
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props: { |
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include: patternTypes, |
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exclude: patternTypes, |
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max: [String, Number], |
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clearCaches: Array |
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}, |
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watch: { |
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clearCaches: function(val) { |
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if (val && val.length > 0) { |
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const {cache, keys} = this |
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val.forEach(key => { |
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pruneCacheEntry(cache, key, keys, this._vnode) |
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}) |
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this.$emit('clear', []) |
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} |
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} |
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}, |
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created() { |
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this.cache = Object.create(null) |
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this.keys = [] |
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}, |
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destroyed () { |
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for (const key in this.cache) { |
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pruneCacheEntry(this.cache, key, this.keys) |
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} |
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}, |
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mounted () { |
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this.$watch('include', val => { |
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pruneCache(this, name => matches(val, name)) |
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}) |
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this.$watch('exclude', val => { |
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pruneCache(this, name => !matches(val, name)) |
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}) |
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}, |
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render () { |
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const slot = this.$slots.default |
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const vnode = getFirstComponentChild(slot) |
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const componentOptions = vnode && vnode.componentOptions |
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if (componentOptions) { |
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// check pattern
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const name = getComponentName(componentOptions) |
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const { include, exclude } = this |
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if ( |
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// not included
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(include && (!name || !matches(include, name))) || |
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// excluded
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(exclude && name && matches(exclude, name)) |
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) { |
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return vnode |
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} |
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const { cache, keys } = this |
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const key = vnode.key == null |
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// same constructor may get registered as different local components
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// so cid alone is not enough (#3269)
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? componentOptions.Ctor.cid + (componentOptions.tag ? `::${componentOptions.tag}` : '') |
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: vnode.key |
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if (cache[key]) { |
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vnode.componentInstance = cache[key].componentInstance |
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// make current key freshest
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remove(keys, key) |
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keys.push(key) |
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} else { |
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cache[key] = vnode |
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keys.push(key) |
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// prune oldest entry
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if (this.max && keys.length > parseInt(this.max)) { |
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pruneCacheEntry(cache, keys[0], keys, this._vnode) |
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} |
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} |
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vnode.data.keepAlive = true |
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} |
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return vnode || (slot && slot[0]) |
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} |
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} |
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@ -0,0 +1,21 @@ |
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export function isDef (v){ |
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return v !== undefined && v !== null |
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} |
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/** |
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* Remove an item from an array. |
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*/ |
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export function remove (arr, item) { |
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if (arr.length) { |
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const index = arr.indexOf(item) |
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if (index > -1) { |
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return arr.splice(index, 1) |
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} |
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} |
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} |
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export function isRegExp (v) { |
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return _toString.call(v) === '[object RegExp]' |
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} |
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const _toString = Object.prototype.toString |
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