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<script lang="ts">
import { onMount, tick } from "svelte";
import { _ } from "svelte-i18n";
export let items: any[][] = [];
export let max_height: number;
export let actual_height: number;
export let table_scrollbar_width: number;
export let start = 0;
export let end = 0;
export let selected: number | false;
let height = "100%";
let average_height: number;
let bottom = 0;
let contents: HTMLTableSectionElement;
let head_height = 0;
let foot_height = 0;
let height_map: number[] = [];
let mounted: boolean;
let rows: HTMLCollectionOf<HTMLTableRowElement>;
let top = 0;
let viewport: HTMLTableElement;
let viewport_height = 0;
let visible: { index: number; data: any[] }[] = [];
let viewport_box: DOMRectReadOnly;
$: viewport_height = viewport_box?.height || 0;
$: if (mounted) requestAnimationFrame(() => refresh_height_map(sortedItems));
let content_height = 0;
async function refresh_height_map(_items: typeof items): Promise<void> {
if (viewport_height === 0) {
return;
}
const { scrollTop } = viewport;
table_scrollbar_width = viewport.offsetWidth - viewport.clientWidth;
content_height = top - (scrollTop - head_height);
let i = start;
while (content_height < max_height && i < _items.length) {
let row = rows[i - start];
if (!row) {
end = i + 1;
await tick(); // render the newly visible row
row = rows[i - start];
}
let _h = row?.getBoundingClientRect().height;
if (!_h) {
_h = average_height;
}
const row_height = (height_map[i] = _h);
content_height += row_height;
i += 1;
}
end = i;
const remaining = _items.length - end;
const scrollbar_height = viewport.offsetHeight - viewport.clientHeight;
if (scrollbar_height > 0) {
content_height += scrollbar_height;
}
let filtered_height_map = height_map.filter((v) => typeof v === "number");
average_height =
filtered_height_map.reduce((a, b) => a + b, 0) /
filtered_height_map.length;
bottom = remaining * average_height;
height_map.length = _items.length;
await tick();
if (!max_height) {
actual_height = content_height + 1;
} else if (content_height < max_height) {
actual_height = content_height + 2;
} else {
actual_height = max_height;
}
await tick();
}
$: scroll_and_render(selected);
async function scroll_and_render(n: number | false): Promise<void> {
requestAnimationFrame(async () => {
if (typeof n !== "number") return;
const direction = typeof n !== "number" ? false : is_in_view(n);
if (direction === true) {
return;
}
if (direction === "back") {
await scroll_to_index(n, { behavior: "instant" });
}
if (direction === "forwards") {
await scroll_to_index(n, { behavior: "instant" }, true);
}
});
}
function is_in_view(n: number): "back" | "forwards" | true {
const current = rows && rows[n - start];
if (!current && n < start) {
return "back";
}
if (!current && n >= end - 1) {
return "forwards";
}
const { top: viewport_top } = viewport.getBoundingClientRect();
const { top, bottom } = current.getBoundingClientRect();
if (top - viewport_top < 37) {
return "back";
}
if (bottom - viewport_top > viewport_height) {
return "forwards";
}
return true;
}
function get_computed_px_amount(elem: HTMLElement, property: string): number {
if (!elem) {
return 0;
}
const compStyle = getComputedStyle(elem);
let x = parseInt(compStyle.getPropertyValue(property));
return x;
}
async function handle_scroll(e: Event): Promise<void> {
const scroll_top = viewport.scrollTop;
rows = contents.children as HTMLCollectionOf<HTMLTableRowElement>;
const is_start_overflow = sortedItems.length < start;
const row_top_border = get_computed_px_amount(rows[1], "border-top-width");
const actual_border_collapsed_width = 0;
if (is_start_overflow) {
await scroll_to_index(sortedItems.length - 1, { behavior: "auto" });
}
let new_start = 0;
// acquire height map for currently visible rows
for (let v = 0; v < rows.length; v += 1) {
height_map[start + v] = rows[v].getBoundingClientRect().height;
}
let i = 0;
// start from top: thead, with its borders, plus the first border to afterwards neglect
let y = head_height + row_top_border / 2;
let row_heights = [];
// loop items to find new start
while (i < sortedItems.length) {
const row_height = height_map[i] || average_height;
row_heights[i] = row_height;
// we only want to jump if the full (incl. border) row is away
if (y + row_height + actual_border_collapsed_width > scroll_top) {
// this is the last index still inside the viewport
new_start = i;
top = y - (head_height + row_top_border / 2);
break;
}
y += row_height;
i += 1;
}
new_start = Math.max(0, new_start);
while (i < sortedItems.length) {
const row_height = height_map[i] || average_height;
y += row_height;
i += 1;
if (y > scroll_top + viewport_height) {
break;
}
}
start = new_start;
end = i;
const remaining = sortedItems.length - end;
if (end === 0) {
end = 10;
}
average_height = (y - head_height) / end;
let remaining_height = remaining * average_height; // 0
// compute height map for remaining items
while (i < sortedItems.length) {
i += 1;
height_map[i] = average_height;
}
bottom = remaining_height;
if (!isFinite(bottom)) {
bottom = 200000;
}
}
export async function scroll_to_index(
index: number,
opts: ScrollToOptions,
align_end = false
): Promise<void> {
await tick();
const _itemHeight = average_height;
let distance = index * _itemHeight;
if (align_end) {
distance = distance - viewport_height + _itemHeight + head_height;
}
const scrollbar_height = viewport.offsetHeight - viewport.clientHeight;
if (scrollbar_height > 0) {
distance += scrollbar_height;
}
const _opts = {
top: distance,
behavior: "smooth" as ScrollBehavior,
...opts
};
viewport.scrollTo(_opts);
}
$: sortedItems = items;
$: visible = sortedItems.slice(start, end).map((data, i) => {
return { index: i + start, data };
});
onMount(() => {
rows = contents.children as HTMLCollectionOf<HTMLTableRowElement>;
mounted = true;
refresh_height_map(items);
});
</script>
<svelte-virtual-table-viewport>
<table
class="table"
bind:this={viewport}
bind:contentRect={viewport_box}
on:scroll={handle_scroll}
style="height: {height}; --bw-svt-p-top: {top}px; --bw-svt-p-bottom: {bottom}px; --bw-svt-head-height: {head_height}px; --bw-svt-foot-height: {foot_height}px; --bw-svt-avg-row-height: {average_height}px"
>
<thead class="thead" bind:offsetHeight={head_height}>
<slot name="thead" />
</thead>
<tbody bind:this={contents} class="tbody">
{#if visible.length && visible[0].data.length}
{#each visible as item (item.data[0].id)}
<slot name="tbody" item={item.data} index={item.index}>
Missing Table Row
</slot>
{/each}
{/if}
</tbody>
<tfoot class="tfoot" bind:offsetHeight={foot_height}>
<slot name="tfoot" />
</tfoot>
</table>
</svelte-virtual-table-viewport>
<style type="text/css">
table {
position: relative;
overflow-y: scroll;
overflow-x: scroll;
-webkit-overflow-scrolling: touch;
max-height: 100vh;
box-sizing: border-box;
display: block;
padding: 0;
margin: 0;
color: var(--body-text-color);
font-size: var(--input-text-size);
line-height: var(--line-md);
font-family: var(--font-mono);
border-spacing: 0;
width: 100%;
scroll-snap-type: x proximity;
}
table :is(thead, tfoot, tbody) {
display: table;
table-layout: fixed;
width: 100%;
box-sizing: border-box;
}
tbody {
overflow-x: scroll;
overflow-y: hidden;
}
table tbody {
padding-top: var(--bw-svt-p-top);
padding-bottom: var(--bw-svt-p-bottom);
}
tbody {
position: relative;
box-sizing: border-box;
border: 0px solid currentColor;
}
tbody > :global(tr:last-child) {
border: none;
}
table :global(td) {
scroll-snap-align: start;
}
tbody > :global(tr:nth-child(even)) {
background: var(--table-even-background-fill);
}
thead {
position: sticky;
top: 0;
left: 0;
z-index: var(--layer-1);
box-shadow: var(--shadow-drop);
overflow: hidden;
}
</style>
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