caba89dacc
- Inline <script> in app.html applies saved localStorage theme before first paint to prevent flash of wrong theme - ThemeToggle.svelte: moon/sun button, localStorage persistence, sets data-theme on <html>, defaults to system preference on first visit - Placed in +layout.svelte between language selector and user menu - E2E tests cover visibility, toggle, reverse toggle, persistence, and no-flash behaviour — all 6 passing Refs #64 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
70 lines
1.6 KiB
Svelte
70 lines
1.6 KiB
Svelte
<script lang="ts">
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import { onMount } from 'svelte';
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type Theme = 'light' | 'dark';
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function systemPrefersDark(): boolean {
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return window.matchMedia('(prefers-color-scheme: dark)').matches;
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}
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function resolveInitialTheme(): Theme {
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const saved = localStorage.getItem('theme');
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if (saved === 'light' || saved === 'dark') return saved;
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return systemPrefersDark() ? 'dark' : 'light';
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}
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let theme = $state<Theme>('light');
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onMount(() => {
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theme = resolveInitialTheme();
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});
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function toggle() {
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theme = theme === 'dark' ? 'light' : 'dark';
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localStorage.setItem('theme', theme);
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document.documentElement.setAttribute('data-theme', theme);
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}
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</script>
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<button
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type="button"
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onclick={toggle}
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aria-label={theme === 'dark' ? 'light mode' : 'dark mode'}
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title={theme === 'dark' ? 'light mode' : 'dark mode'}
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class="rounded p-1.5 text-ink-2 transition-colors hover:bg-muted hover:text-ink"
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>
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{#if theme === 'dark'}
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<!-- Sun icon — click to go light -->
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<svg
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class="h-4 w-4"
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viewBox="0 0 24 24"
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fill="none"
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stroke="currentColor"
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stroke-width="2"
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aria-hidden="true"
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>
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<circle cx="12" cy="12" r="4" />
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<path
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stroke-linecap="round"
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d="M12 2v2M12 20v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M2 12h2M20 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"
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/>
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</svg>
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{:else}
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<!-- Moon icon — click to go dark -->
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<svg
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class="h-4 w-4"
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viewBox="0 0 24 24"
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fill="none"
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stroke="currentColor"
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stroke-width="2"
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aria-hidden="true"
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>
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<path
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stroke-linecap="round"
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stroke-linejoin="round"
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d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"
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/>
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</svg>
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{/if}
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</button>
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