83 lines
2.3 KiB
Svelte
83 lines
2.3 KiB
Svelte
<!--
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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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/* This component accepts an array of tabs and a value. Whenever a tab is
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activated, its last used value is applied to its provided setter and the
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component's value. Whenever it's deactivated, its setter is called with its
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disabledValue. */
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import type { ValueTab } from "./lib";
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export let tabs: ValueTab[];
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export let value: number;
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let activeTab = lastSetTab();
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$: onTabChanged(activeTab);
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$: value = tabs[activeTab].value ?? 0;
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$: tabs[activeTab].setValue(value);
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function lastSetTab(): number {
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const revIdx = tabs
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.slice()
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.reverse()
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.findIndex((tab) => tab.value !== null);
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return revIdx === -1 ? 0 : tabs.length - revIdx - 1;
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}
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function onTabChanged(newTab: number) {
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for (const [idx, tab] of tabs.entries()) {
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if (newTab === idx) {
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tab.enable(value);
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} else if (newTab > idx) {
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/* antecedent tabs are obscured, so we can preserve their original values */
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tab.reset();
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} else {
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/* but subsequent tabs would obscure, so they must be nulled */
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tab.disable();
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}
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}
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}
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const handleClick = (tabValue: number) => () => (activeTab = tabValue);
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</script>
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<ul>
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{#each tabs as tab, idx}
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<li class:active={activeTab === idx}>
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<button on:click={handleClick(idx)}>{tab.title}</button>
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</li>
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{/each}
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</ul>
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<style lang="scss">
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ul {
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width: 100%;
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display: flex;
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flex-wrap: nowrap;
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justify-content: space-between;
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padding-inline: 0;
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margin-bottom: 0.25rem;
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list-style: none;
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}
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button {
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display: block;
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white-space: nowrap;
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cursor: pointer;
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color: var(--fg-subtle);
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border: none;
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background-color: transparent;
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}
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li.active > button {
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color: var(--fg);
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border-bottom: 4px solid var(--border-focus);
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margin-bottom: -2px;
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border-radius: 0;
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}
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button:hover {
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color: var(--fg);
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}
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</style>
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