82 lines
2.1 KiB
Svelte
82 lines
2.1 KiB
Svelte
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<!--
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Copyright: Ankitects Pty Ltd and contributors
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License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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-->
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<script lang="ts">
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import { promiseWithResolver } from "../lib/promise";
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export let scroll = true;
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const [element, elementResolve] = promiseWithResolver<HTMLElement>();
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let clientWidth = 0;
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let clientHeight = 0;
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let scrollWidth = 0;
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let scrollHeight = 0;
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let scrollTop = 0;
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let scrollLeft = 0;
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$: overflowTop = scrollTop > 0;
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$: overflowBottom = scrollTop < scrollHeight - clientHeight;
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$: overflowLeft = scrollLeft > 0;
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$: overflowRight = scrollLeft < scrollWidth - clientWidth;
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$: shadows = {
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top: overflowTop ? "0 5px" : null,
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bottom: overflowBottom ? "0 -5px" : null,
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left: overflowLeft ? "5px 0" : null,
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right: overflowRight ? "-5px 0" : null,
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};
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const rest = "5px -5px var(--shadow)";
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$: shadow = Array.from(
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Object.values(shadows).filter((v) => v != null),
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(v) => `inset ${v} ${rest}`,
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).join(", ");
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async function updateScrollState(): Promise<void> {
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const el = await element;
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scrollHeight = el.scrollHeight;
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scrollWidth = el.scrollWidth;
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scrollTop = el.scrollTop;
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scrollLeft = el.scrollLeft;
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}
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</script>
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<div
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class="pane-content"
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class:scroll
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style:--box-shadow={shadow}
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style:--client-height="{clientHeight}px"
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use:elementResolve
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bind:clientHeight
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bind:clientWidth
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on:scroll={updateScrollState}
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on:resize={updateScrollState}
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>
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<slot />
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</div>
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<style lang="scss">
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.pane-content {
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display: flex;
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flex-direction: column;
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flex-grow: 1;
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overflow: hidden;
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&.scroll {
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overflow: auto;
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}
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/* force box-shadow to be rendered above children */
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&::before {
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content: "";
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position: fixed;
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pointer-events: none;
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left: 0;
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right: 0;
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z-index: 4;
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height: var(--client-height);
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box-shadow: var(--box-shadow);
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transition: box-shadow 0.1s ease-in-out;
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}
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}
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</style>
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