livewire-material/resources/views/components/theme-toggle.blade.php

{{-- Switches the colour theme through `$store.theme` (resources/js/theme.js), so every toggle on a
     page reads and writes the one choice and none needs an id.

     `mode`:
     - `toggle` (the default): an icon button between light and dark. The icon is where it takes
       you — a sun while the page is dark, a moon while it is light — and it is a toggle button,
       "Dark theme", pressed while dark.
     - `cycle`: an icon button that steps light → dark → system, showing the choice it is on.
     - `picker`: the three choices as a connected button group, for a settings page.
     - `contrast`: the same row for M3's three contrast levels — standard, medium (3:1) and high
       (7:1), the three the scheme is generated in. The row marks the level in force
       (`resolvedContrast`), so the operating system's setting shows while the choice is
       `system`, and choosing one is an explicit choice from then on.

     The two rows are `<x-group>` — M3 Expressive's connected button group, the successor of the
     segmented button, which the expressive update deprecates. Its segments are native radios, so
     the browser supplies the radiogroup semantics, both arrow axes, the wrap and the roving tab
     stop; the store is bound through an `x-model` accessor on the wrapper, since the level a
     contrast row marks is the resolved one but the level it writes goes through `setContrast()`.
     `label` adds a visible legend (a settings page); without one the row is still named for a
     screen reader. `class` lands on the button or on the group.

     The theme is the visitor's, known only in the browser, so the parts that depend on it wait for
     Alpine (`x-cloak`, an unchecked radio) rather than render a guess. --}}

@props([
    'mode' => 'toggle',
    'label' => null,
])

@php
    $mode = in_array($mode, ['toggle', 'cycle', 'picker', 'contrast'], true) ? $mode : 'toggle';

    $row = [
        'picker' => [
            'name' => __('Theme'),
            'field' => 'material-theme',
            'read' => '$store.theme.choice',
            'write' => '$store.theme.set(value)',
            'options' => [
                ['id' => 'light', 'name' => __('Light'), 'icon' => 'light_mode'],
                ['id' => 'dark', 'name' => __('Dark'), 'icon' => 'dark_mode'],
                ['id' => 'system', 'name' => __('System'), 'icon' => 'brightness_auto'],
            ],
        ],
        'contrast' => [
            'name' => __('Contrast'),
            'field' => 'material-contrast',
            'read' => '$store.theme.resolvedContrast',
            'write' => '$store.theme.setContrast(value)',
            'options' => [
                ['id' => 'standard', 'name' => __('Standard'), 'icon' => 'contrast'],
                ['id' => 'medium', 'name' => __('Medium'), 'icon' => 'contrast_circle'],
                ['id' => 'high', 'name' => __('High'), 'icon' => 'contrast_square'],
            ],
        ],
    ][$mode] ?? null;
@endphp

@if ($row !== null)
    <div
        role="group"
        aria-label="{{ $label ?? $row['name'] }}"
        data-md-theme-toggle="{{ $mode }}"
        x-data="{
            get chosen() {
                return this.{{ $row['read'] }}
            },
            set chosen(value) {
                this.{{ $row['write'] }}
            },
        }"
    >
        <x-livewire-material::group
            inline
            x-model="chosen"
            :label="$label"
            :name="$row['field']"
            :options="$row['options']"
            {{ $attributes }}
        />
    </div>
@else
    <button
        type="button"
        x-data
        data-md-icon-button
        data-md-theme-toggle="{{ $mode }}"
        @if ($mode === 'cycle')
            aria-label="{{ __('Theme') }}"
            x-bind:aria-label="{ light: @js(__('Theme: light')), dark: @js(__('Theme: dark')), system: @js(__('Theme: system')) }[$store.theme.choice]"
            x-on:click="$store.theme.set({ light: 'dark', dark: 'system', system: 'light' }[$store.theme.choice])"
        @else
            aria-label="{{ __('Dark theme') }}"
            aria-pressed="false"
            x-bind:aria-pressed="($store.theme.resolved === 'dark').toString()"
            x-on:click="$store.theme.toggle()"
        @endif
        {{ $attributes->class(['md-state-layer', 'md-touch-target', 'md-focus-ring']) }}
    >
        @if ($mode === 'cycle')
            <x-livewire-material::icon name="light_mode" x-cloak x-show="$store.theme.choice === 'light'" />
            <x-livewire-material::icon name="dark_mode" x-cloak x-show="$store.theme.choice === 'dark'" />
            <x-livewire-material::icon name="brightness_auto" x-cloak x-show="$store.theme.choice === 'system'" />
        @else
            <x-livewire-material::icon name="light_mode" x-cloak x-show="$store.theme.resolved === 'dark'" />
            <x-livewire-material::icon name="dark_mode" x-cloak x-show="$store.theme.resolved !== 'dark'" />
        @endif
    </button>
@endif