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| 1 | +// @ts-check |
| 2 | + |
| 3 | +/*eslint-disable */ |
| 4 | + |
| 5 | +export default class DarkModeController { |
| 6 | + static get timeout() { |
| 7 | + const value = Symbol.for('dark-mode.toggler.timeout'); |
| 8 | + Object.defineProperty(this, 'timeout', { value, writable: false }); |
| 9 | + return value; |
| 10 | + } |
| 11 | + |
| 12 | + static get resetting() { |
| 13 | + const value = Symbol.for('dark-mode.toggler.resetting'); |
| 14 | + Object.defineProperty(this, 'resetting', { value, writable: false }); |
| 15 | + return value; |
| 16 | + } |
| 17 | + |
| 18 | + static get prefersLightMode() { |
| 19 | + const value = |
| 20 | + (typeof matchMedia === 'function' && |
| 21 | + matchMedia('(prefers-color-scheme: light)')) || |
| 22 | + undefined; |
| 23 | + Object.defineProperty(this, 'prefersLightMode', { value, writable: false }); |
| 24 | + return value; |
| 25 | + } |
| 26 | + |
| 27 | + static get prefersDarkMode() { |
| 28 | + const value = |
| 29 | + (typeof matchMedia === 'function' && |
| 30 | + matchMedia('(prefers-color-scheme: dark)')) || |
| 31 | + undefined; |
| 32 | + Object.defineProperty(this, 'prefersDarkMode', { value, writable: false }); |
| 33 | + return value; |
| 34 | + } |
| 35 | + |
| 36 | + /** @param {HTMLElement} [target] */ |
| 37 | + constructor(target) { |
| 38 | + Object.defineProperties(this, { |
| 39 | + target: { |
| 40 | + value: |
| 41 | + /** @type {HTMLElement|undefined} */ (target || |
| 42 | + (typeof document === 'object' && document.body) || |
| 43 | + undefined), |
| 44 | + writable: false, |
| 45 | + }, |
| 46 | + [DarkModeController.timeout]: { |
| 47 | + value: /** @type {number|undefined} */ (undefined), |
| 48 | + writable: true, |
| 49 | + }, |
| 50 | + [DarkModeController.resetting]: { |
| 51 | + value: /** @type {boolean|undefined} */ (undefined), |
| 52 | + writable: true, |
| 53 | + }, |
| 54 | + state: { |
| 55 | + value: /** @type {DarkModeState|undefined} */ (undefined), |
| 56 | + writable: true, |
| 57 | + }, |
| 58 | + prefers: { |
| 59 | + value: /** @type {PrefersColorSchemes|undefined} */ (undefined), |
| 60 | + writable: true, |
| 61 | + }, |
| 62 | + enable: { value: this.enable.bind(this), writable: false }, |
| 63 | + disable: { value: this.disable.bind(this), writable: false }, |
| 64 | + toggle: { value: this.toggle.bind(this), writable: false }, |
| 65 | + onPointerDown: { value: this.onPointerDown.bind(this), writable: false }, |
| 66 | + onPointerUp: { value: this.onPointerUp.bind(this), writable: false }, |
| 67 | + }); |
| 68 | + |
| 69 | + ((prefersDarkMode, prefersLightMode, localStorage) => { |
| 70 | + if (!localStorage || !prefersDarkMode || !prefersLightMode) return; |
| 71 | + localStorage.darkMode === 'enabled' |
| 72 | + ? ((this.state = 'enabled'), this.enable()) |
| 73 | + : localStorage.darkMode === 'disabled' |
| 74 | + ? ((this.state = 'disabled'), this.disable()) |
| 75 | + : this.toggle( |
| 76 | + prefersDarkMode.matches === true || |
| 77 | + prefersLightMode.matches !== true, |
| 78 | + !!(localStorage.darkMode = this.state = 'auto') |
| 79 | + ); |
| 80 | + prefersDarkMode.addListener( |
| 81 | + ({ matches = false }) => |
| 82 | + matches === true && this.toggle(!!matches, true) |
| 83 | + ); |
| 84 | + prefersLightMode.addListener( |
| 85 | + ({ matches = false }) => matches === true && this.toggle(!matches, true) |
| 86 | + ); |
| 87 | + })( |
| 88 | + DarkModeController.prefersDarkMode, |
| 89 | + DarkModeController.prefersLightMode, |
| 90 | + (typeof localStorage === 'object' && localStorage) || undefined |
| 91 | + ); |
| 92 | + |
| 93 | + Object.preventExtensions(this); |
| 94 | + } |
| 95 | + |
| 96 | + /** |
| 97 | + * @param {DarkModeState|boolean} [state] |
| 98 | + * @param {boolean} [auto] |
| 99 | + */ |
| 100 | + async toggle(state, auto) { |
| 101 | + const { classList } = this.target; |
| 102 | + |
| 103 | + if (auto === true) { |
| 104 | + if (state === true) this.prefers = 'dark'; |
| 105 | + else if (state === false) this.prefers = 'light'; |
| 106 | + if (this.state !== 'auto') return; |
| 107 | + } |
| 108 | + |
| 109 | + state = |
| 110 | + state === 'auto' |
| 111 | + ? ((auto = true), this.prefers !== 'light') |
| 112 | + : state == null |
| 113 | + ? !classList.contains('dark-mode') |
| 114 | + : !!state; |
| 115 | + |
| 116 | + this.state = localStorage.darkMode = auto |
| 117 | + ? 'auto' |
| 118 | + : state |
| 119 | + ? 'enabled' |
| 120 | + : 'disabled'; |
| 121 | + |
| 122 | + state |
| 123 | + ? (classList.add('dark-mode'), classList.remove('light-mode')) |
| 124 | + : (classList.add('light-mode'), classList.remove('dark-mode')); |
| 125 | + } |
| 126 | + |
| 127 | + /** @param {boolean} [auto] */ |
| 128 | + enable(auto) { |
| 129 | + this.toggle(true, auto); |
| 130 | + } |
| 131 | + |
| 132 | + /** @param {boolean} [auto] */ |
| 133 | + disable(auto) { |
| 134 | + this.toggle(false, auto); |
| 135 | + } |
| 136 | + |
| 137 | + onPointerDown() { |
| 138 | + clearTimeout(this[DarkModeController.timeout]); |
| 139 | + this[DarkModeController.timeout] = setTimeout(() => { |
| 140 | + this.toggle('auto'); |
| 141 | + this[DarkModeController.resetting] = true; |
| 142 | + // console.log('Reset dark mode!'); |
| 143 | + }, 2000); |
| 144 | + } |
| 145 | + |
| 146 | + onPointerUp() { |
| 147 | + this[DarkModeController.timeout] = clearTimeout( |
| 148 | + this[DarkModeController.timeout] |
| 149 | + ); |
| 150 | + this[DarkModeController.resetting] === true |
| 151 | + ? (this[DarkModeController.resetting] = false) |
| 152 | + : this.toggle(); |
| 153 | + } |
| 154 | +} |
| 155 | + |
| 156 | +Object.preventExtensions(DarkModeController); |
| 157 | + |
| 158 | +/** @typedef {'auto'|'enabled'|'disabled'} DarkModeState */ |
| 159 | +/** @typedef {'light'|'dark'} PrefersColorSchemes */ |
| 160 | + |
| 161 | +/* eslint-enable */ |
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