pinafore/routes/_components/VirtualListContainer.html

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2018-01-23 06:30:14 +01:00
<:Window bind:innerHeight />
<div class="container" on:scroll="onScroll(event)" on:fullscreen="onFullscreenChange()" ref:node>
<slot></slot>
</div>
<script>
import { virtualListStore } from '../_utils/virtualListStore'
import debounce from 'lodash/debounce'
import throttle from 'lodash/throttle'
import { isFullscreen, attachFullscreenListener, detachFullscreenListener } from '../_utils/fullscreen'
import { mark, stop } from '../_utils/marks'
const SCROLL_EVENT_DELAY = 300
const RESIZE_EVENT_DELAY = 700
export default {
oncreate() {
mark('onCreate VirtualListContainer')
let node = this.refs.node
this.observe('innerHeight', debounce(() => {
// respond to window resize events
this.store.set({
offsetHeight: node.offsetHeight
})
}, RESIZE_EVENT_DELAY))
this.store.set({
scrollTop: node.scrollTop,
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.set({
scrollTop: event.target.scrollTop,
scrollHeight: event.target.scrollHeight
})
},
onFullscreenChange() {
mark('onFullscreenChange')
console.log('is fullscreen? ', isFullscreen())
this.set({ fullscreen: isFullscreen() })
stop('onFullscreenChange')
}
}
};
</script>