pinafore/routes/_components/virtualList/VirtualListContainer.html
Nolan Lawson b7f5d04b4c
fix(scrolling): use body as scrolling container (#656)
* fix(scrolling): use body as scrolling container

Fixes #526

* fixup tests and focus
2018-11-17 18:06:49 -08:00

106 lines
3.5 KiB
HTML
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<slot></slot>
<script>
import { virtualListStore } from './virtualListStore'
import throttle from 'lodash-es/throttle'
import { isFullscreen, attachFullscreenListener, detachFullscreenListener } from '../../_utils/fullscreen'
import { mark, stop } from '../../_utils/marks'
import { doubleRAF } from '../../_utils/doubleRAF'
import { observe } from 'svelte-extras'
import { addScrollListener, removeScrollListener, getScrollContainer } from '../../_utils/scrollContainer'
const SCROLL_EVENT_DELAY = 300
export default {
oncreate () {
mark('onCreate VirtualListContainer')
let {
realm
} = this.get()
this.store.setCurrentRealm(realm)
this.setupScroll()
this.setupFullscreen()
let { scrollTop } = this.store.get()
if (scrollTop > 0) {
this.observe('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight => {
console.log('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight)
let { initializedScrollTop } = this.get()
if (!initializedScrollTop && allVisibleItemsHaveHeight) {
this.set({ 'initializedScrollTop': true })
mark('set scrollTop')
console.log('forcing scroll top to ', scrollTop)
getScrollContainer().scrollTop = scrollTop
stop('set scrollTop')
doubleRAF(() => {
console.log('initialized VirtualList')
this.fire('initialized')
})
}
})
} else {
this.fire('noNeedToScroll')
this.observe('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight => {
if (allVisibleItemsHaveHeight) {
console.log('initialized VirtualList')
this.fire('initialized')
}
})
this.store.setForRealm({
scrollHeight: getScrollContainer().scrollHeight,
offsetHeight: getScrollContainer().offsetHeight
})
}
stop('onCreate VirtualListContainer')
},
ondestroy () {
this.teardownScroll()
this.teardownFullscreen()
this.store.setCurrentRealm(null)
},
store: () => virtualListStore,
methods: {
observe,
setupScroll () {
this.scrollListener = throttle(event => {
let { fullscreen } = this.get()
if (fullscreen) {
return
}
this.onScroll()
}, SCROLL_EVENT_DELAY, {
leading: true,
trailing: true
})
addScrollListener(this.scrollListener)
},
teardownScroll () {
removeScrollListener(this.scrollListener)
},
setupFullscreen () {
this.onFullscreenChange = this.onFullscreenChange.bind(this)
attachFullscreenListener(this.onFullscreenChange)
},
teardownFullscreen () {
detachFullscreenListener(this.onFullscreenChange)
},
onScroll () {
let { scrollTop, scrollHeight } = getScrollContainer()
doubleRAF(() => {
mark('onScroll -> setForRealm()')
this.store.setForRealm({ scrollTop, scrollHeight })
stop('onScroll -> setForRealm()')
})
},
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>