97 lines
2.9 KiB
HTML
97 lines
2.9 KiB
HTML
<div class="container"
|
||
on:scroll="onScroll(event)"
|
||
on:fullscreen="onFullscreenChange()"
|
||
ref:node>
|
||
<slot></slot>
|
||
</div>
|
||
<script>
|
||
import { virtualListStore } from './virtualListStore'
|
||
|
||
import throttle from 'lodash/throttle'
|
||
import { isFullscreen, attachFullscreenListener, detachFullscreenListener } from '../../_utils/fullscreen'
|
||
import { mark, stop } from '../../_utils/marks'
|
||
|
||
const SCROLL_EVENT_DELAY = 300
|
||
|
||
export default {
|
||
oncreate() {
|
||
mark('onCreate VirtualListContainer')
|
||
let node = this.refs.node
|
||
let realm = this.get('realm')
|
||
this.store.set({currentRealm: realm})
|
||
let scrollTop = this.store.get('scrollTop')
|
||
if (scrollTop > 0) {
|
||
this.observe('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight => {
|
||
console.log('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight)
|
||
if (!this.get('initializedScrollTop') && allVisibleItemsHaveHeight && node) {
|
||
this.set({'initializedScrollTop': true})
|
||
requestAnimationFrame(() => {
|
||
mark('set scrollTop')
|
||
console.log('forcing scroll top to ', scrollTop)
|
||
node.scrollTop = scrollTop
|
||
stop('set scrollTop')
|
||
})
|
||
}
|
||
})
|
||
} else {
|
||
this.store.setForRealm({
|
||
scrollHeight: node.scrollHeight,
|
||
offsetHeight: node.offsetHeight
|
||
})
|
||
}
|
||
stop('onCreate VirtualListContainer')
|
||
},
|
||
store: () => virtualListStore,
|
||
events: {
|
||
scroll(node, callback) {
|
||
const onScroll = throttle(event => {
|
||
mark('onScroll')
|
||
if (this.get('fullscreen')) {
|
||
return
|
||
}
|
||
callback(event)
|
||
stop('onScroll')
|
||
}, SCROLL_EVENT_DELAY, {
|
||
leading: true,
|
||
trailing: true
|
||
})
|
||
node.addEventListener('scroll', onScroll)
|
||
|
||
return {
|
||
teardown() {
|
||
node.removeEventListener('scroll', onScroll)
|
||
}
|
||
}
|
||
},
|
||
fullscreen(node, callback) {
|
||
const onFullscreen = (() => {
|
||
callback()
|
||
})
|
||
attachFullscreenListener(onFullscreen)
|
||
return {
|
||
teardown() {
|
||
detachFullscreenListener(onFullscreen)
|
||
}
|
||
}
|
||
}
|
||
},
|
||
methods: {
|
||
onScroll(event) {
|
||
this.store.setForRealm({
|
||
scrollTop: event.target.scrollTop,
|
||
scrollHeight: event.target.scrollHeight
|
||
})
|
||
},
|
||
onFullscreenChange() {
|
||
mark('onFullscreenChange')
|
||
console.log('is fullscreen? ', isFullscreen())
|
||
this.set({ fullscreen: isFullscreen() })
|
||
stop('onFullscreenChange')
|
||
}
|
||
},
|
||
computed: {
|
||
// TODO: bug in svelte/store – the observer in oncreate() never get removed without this hack
|
||
allVisibleItemsHaveHeight: ($allVisibleItemsHaveHeight) => $allVisibleItemsHaveHeight
|
||
}
|
||
};
|
||
</script> |