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exposed view port scroll event #42

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exposed view port scroll event #42

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8 changes: 6 additions & 2 deletions VirtualList.svelte
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
<script>
import { onMount, tick } from 'svelte';
import { onMount, tick, createEventDispatcher } from 'svelte';

const dispatch = createEventDispatcher();

// props
export let items;
Expand Down Expand Up @@ -64,7 +66,7 @@

}

async function handle_scroll() {
async function handle_scroll(event) {
const { scrollTop } = viewport;

const old_start = start;
Expand Down Expand Up @@ -122,6 +124,8 @@
viewport.scrollTo(0, scrollTop + d);
}

dispatch('scroll', event);

// TODO if we overestimated the space these
// rows would occupy we may need to add some
// more. maybe we can just call handle_scroll again?
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