55 lines
1.5 KiB
HTML
55 lines
1.5 KiB
HTML
<div class="virtual-list-header {{shown ? 'shown' : ''}} {{fadedIn ? 'faded-in' : ''}}"
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ref:node >
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<:Component {component} :virtualProps />
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</div>
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<style>
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.virtual-list-header {
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position: absolute;
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top: 0;
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width: 100%;
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opacity: 0;
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z-index: 10;
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transition: none;
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display: none;
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}
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.virtual-list-header.shown {
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display: block;
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transition: opacity 0.333s linear;
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}
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.virtual-list-header.faded-in {
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opacity: 1;
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}
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</style>
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<script>
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import { virtualListStore } from './virtualListStore'
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import { AsyncLayout } from '../../_utils/AsyncLayout'
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import { doubleRAF } from '../../_utils/doubleRAF'
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export default {
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oncreate () {
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this.observe('shown', shown => {
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if (shown) {
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this.doCalculateHeight()
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doubleRAF(() => this.set({fadedIn: true})) // animate in
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} else {
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this.set({fadedIn: false})
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}
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}, {init: false})
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},
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store: () => virtualListStore,
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methods: {
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doCalculateHeight () {
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let { heightCalculated } = this.get()
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if (heightCalculated) { // only need to calculate once, it never changes
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return
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}
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this.set({heightCalculated: true})
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const asyncLayout = new AsyncLayout(() => '__header__')
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asyncLayout.observe('__header__', this.refs.node, (rect) => {
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asyncLayout.disconnect()
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this.store.setForRealm({headerHeight: rect.height})
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})
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}
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}
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}
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</script> |