Andreas Reinhold / reiniandClaude Fable 5.1
7084aac788
The head script reads livewire-material.theme.contrast (standard, medium, high or system, kept under its own storage key), asks the operating system while the choice is system and follows it, and writes <html data-contrast> — nothing for standard, which is what the stylesheet's plain blocks already are. It writes <html data-motion="standard"> for motion.scheme, and both attributes, with the new choice and key ones, survive wire:navigate. $store.theme gains contrast, resolvedContrast and setContrast(); the theme-color meta takes its surface from the resolved level. Plan: docs/plans/material-3-alignment.md, steps 5 and 7 (core C2, C9). Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
118 lines
4.4 KiB
JavaScript
118 lines
4.4 KiB
JavaScript
/**
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* The theme, as one piece of state every toggle on the page shares.
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*
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* <x-theme-script> has already decided the theme before this runs; the store starts from
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* what it wrote on <html> (data-theme-choice, data-theme, data-theme-key). `choice` is what
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* the visitor picked — light, dark or system — and `resolved` is what is showing.
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*
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* `value` is an accessor, so binding a control with `x-model="$store.theme.value"` goes
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* through the same write as `set()` and `toggle()`: the attributes, then localStorage.
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*
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* M3's contrast level is the same pair: `contrast` is the choice (standard, medium, high or
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* system) and `resolvedContrast` the level on screen, which is `standard` wherever <html>
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* carries no data-contrast — the stylesheet's plain blocks are that level. `setContrast()`
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* writes both, through the same attribute the head script wrote before the first paint.
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*
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* `scheme` is the colour profile on screen (<html data-scheme>, which the server chose), and
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* `previewScheme(name)` shows another one on this page without storing anything — the
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* application saves a choice itself, and the next full load draws what it saved.
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*/
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document.addEventListener('alpine:init', () => {
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const root = document.documentElement
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const media = window.matchMedia('(prefers-color-scheme: dark)')
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const contrastMedia = window.matchMedia('(prefers-contrast: more)')
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const choices = ['light', 'dark', 'system']
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const levels = ['standard', 'medium', 'high', 'system']
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const resolve = (choice) => (choice === 'system' ? (media.matches ? 'dark' : 'light') : choice)
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const resolveContrast = (choice) => (choice === 'system' ? (contrastMedia.matches ? 'high' : 'standard') : choice)
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window.Alpine.store('theme', {
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choice: choices.includes(root.dataset.themeChoice) ? root.dataset.themeChoice : 'system',
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resolved: root.dataset.theme === 'dark' ? 'dark' : 'light',
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contrast: levels.includes(root.dataset.contrastChoice) ? root.dataset.contrastChoice : 'system',
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resolvedContrast: root.dataset.contrast === 'medium' || root.dataset.contrast === 'high' ? root.dataset.contrast : 'standard',
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scheme: root.dataset.scheme || null,
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get value() {
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return this.choice
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},
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set value(choice) {
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this.set(choice)
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},
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set(choice) {
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if (!choices.includes(choice)) {
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return
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}
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this.choice = choice
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this.resolved = resolve(choice)
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root.dataset.themeChoice = choice
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root.dataset.theme = this.resolved
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try {
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localStorage.setItem(root.dataset.themeKey || 'material-theme', choice)
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} catch {
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// Blocked storage: the page still switches, it just will not remember.
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}
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},
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toggle() {
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this.set(this.resolved === 'dark' ? 'light' : 'dark')
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},
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setContrast(choice) {
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if (!levels.includes(choice)) {
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return
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}
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this.contrast = choice
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this.resolvedContrast = resolveContrast(choice)
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root.dataset.contrastChoice = choice
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if (this.resolvedContrast === 'standard') {
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delete root.dataset.contrast
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} else {
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root.dataset.contrast = this.resolvedContrast
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}
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try {
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localStorage.setItem(root.dataset.contrastKey || 'material-contrast', choice)
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} catch {
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// Blocked storage: the page still switches, it just will not remember.
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}
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},
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previewScheme(name) {
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if (typeof name !== 'string' || !/^[a-z0-9-]+$/.test(name)) {
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return
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}
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this.scheme = name
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root.dataset.scheme = name
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},
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})
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// The head script repaints on an OS change while the choice is `system`; this keeps the
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// store's `resolved` — which a toggle's icon reads — in step with it.
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media.addEventListener('change', () => {
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const theme = window.Alpine.store('theme')
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if (theme.choice === 'system') {
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theme.resolved = resolve('system')
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}
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})
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contrastMedia.addEventListener('change', () => {
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const theme = window.Alpine.store('theme')
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if (theme.contrast === 'system') {
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theme.resolvedContrast = resolveContrast('system')
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}
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})
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})
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