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<template>
<RecycleScroller
ref="scroller"
:items="itemsWithSize"
:min-item-size="minItemSize"
:direction="direction"
key-field="id"
v-bind="$attrs"
@resize="onScrollerResize"
@visible="onScrollerVisible"
v-on="listeners"
>
<template slot-scope="{ item: itemWithSize, index, active }">
<slot
v-bind="{
item: itemWithSize.item,
index,
active,
itemWithSize
}"
/>
</template>
<template slot="before">
<slot name="before" />
</template>
<template slot="after">
<slot name="after" />
</template>
</RecycleScroller>
</template>
<script>
import RecycleScroller from './RecycleScroller.vue'
import { props, simpleArray } from './common'
export default {
name: 'DynamicScroller',
components: {
RecycleScroller,
},
inheritAttrs: false,
provide () {
if (typeof ResizeObserver !== 'undefined') {
this.$_resizeObserver = new ResizeObserver(entries => {
for (const entry of entries) {
if (entry.target) {
const event = new CustomEvent(
'resize',
{
detail: {
contentRect: entry.contentRect,
},
},
)
entry.target.dispatchEvent(event)
}
}
})
}
return {
vscrollData: this.vscrollData,
vscrollParent: this,
vscrollResizeObserver: this.$_resizeObserver,
}
},
props: {
...props,
minItemSize: {
type: [Number, String],
required: true,
},
},
data () {
return {
vscrollData: {
active: true,
sizes: {},
validSizes: {},
keyField: this.keyField,
simpleArray: false,
},
}
},
computed: {
simpleArray,
itemsWithSize () {
const result = []
const { items, keyField, simpleArray } = this
const sizes = this.vscrollData.sizes
for (let i = 0; i < items.length; i++) {
const item = items[i]
const id = simpleArray ? i : item[keyField]
let size = sizes[id]
if (typeof size === 'undefined' && !this.$_undefinedMap[id]) {
size = 0
}
result.push({
item,
id,
size,
})
}
return result
},
listeners () {
const listeners = {}
for (const key in this.$listeners) {
if (key !== 'resize' && key !== 'visible') {
listeners[key] = this.$listeners[key]
}
}
return listeners
},
},
watch: {
items () {
this.forceUpdate(false)
},
simpleArray: {
handler (value) {
this.vscrollData.simpleArray = value
},
immediate: true,
},
direction (value) {
this.forceUpdate(true)
},
},
created () {
this.$_updates = []
this.$_undefinedSizes = 0
this.$_undefinedMap = {}
},
activated () {
this.vscrollData.active = true
},
deactivated () {
this.vscrollData.active = false
},
methods: {
onScrollerResize () {
const scroller = this.$refs.scroller
if (scroller) {
this.forceUpdate()
}
this.$emit('resize')
},
onScrollerVisible () {
this.$emit('vscroll:update', { force: false })
this.$emit('visible')
},
forceUpdate (clear = true) {
if (clear || this.simpleArray) {
this.vscrollData.validSizes = {}
}
this.$emit('vscroll:update', { force: true })
},
scrollToItem (index) {
const scroller = this.$refs.scroller
if (scroller) scroller.scrollToItem(index)
},
getItemSize (item, index = undefined) {
const id = this.simpleArray ? (index != null ? index : this.items.indexOf(item)) : item[this.keyField]
return this.vscrollData.sizes[id] || 0
},
scrollToBottom () {
if (this.$_scrollingToBottom) return
this.$_scrollingToBottom = true
const el = this.$el
// Item is inserted to the DOM
this.$nextTick(() => {
el.scrollTop = el.scrollHeight + 5000
// Item sizes are computed
const cb = () => {
el.scrollTop = el.scrollHeight + 5000
requestAnimationFrame(() => {
el.scrollTop = el.scrollHeight + 5000
if (this.$_undefinedSizes === 0) {
this.$_scrollingToBottom = false
} else {
requestAnimationFrame(cb)
}
})
}
requestAnimationFrame(cb)
})
},
},
}
</script>
|
