144 lines
5.4 KiB
TypeScript
144 lines
5.4 KiB
TypeScript
import { useEffect, useSyncExternalStore } from 'react'
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import { backgroundUrl, DEFAULT_PHOTO, PHOTOS } from './backgrounds'
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/**
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* 展示页右下角「外观」里能调的参数:都是相对默认值的倍数(1 = 原样),存在浏览器里。
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* 分两类:天气(雪,见 weather/)和背景(模糊、跟着鼠标晃动)。
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*/
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export interface AppearanceSettings {
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/** 下雪的总开关。 */
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enabled: boolean
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/** 数量。 */
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density: number
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/** 下落速度。 */
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speed: number
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/** 风力(风的大小和鼠标带起的风)。 */
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wind: number
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/** 粒子大小。 */
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size: number
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/** 虚化程度(1 是预设原样,小于 1 更清晰,大于 1 更糊)。 */
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blur: number
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/** 透明度。 */
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opacity: number
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/** 子弹时间(鼠标停住时周围变慢)。 */
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bullet: boolean
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/** 鼠标拨动雪。 */
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mouse: boolean
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/** 用哪张照片(id,见 backgrounds.ts)。 */
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photo: string
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/** 背景模糊:开是随主题的两张预先模糊过的图,关是不模糊的图(两张,也是随主题)。 */
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bgBlurred: boolean
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/** 背景模糊关着的时候:开是加载没压缩的原图(PNG,近 2MB 一张),关是压缩过的(JPG,不到 300KB)。 */
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bgOriginal: boolean
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/** 背景模糊开着的时候,在预先模糊的基础上再模糊多少(像素,0 是不再模糊)。 */
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bgBlur: number
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/** 背景跟着鼠标晃动:总开关,关了背景就完全不动。 */
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sway: boolean
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/** 背景跟着鼠标晃动的幅度(1 是默认)。 */
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parallax: number
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/** 盖在背景图上的那层遮罩(亮色是白、暗色是灰)的浓度:0 是不盖,1 是默认(亮色 50%、暗色 62%)。 */
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bgVeil: number
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}
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export const APPEARANCE_DEFAULTS: AppearanceSettings = {
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enabled: true,
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density: 1,
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speed: 1,
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wind: 1,
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size: 1,
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blur: 1,
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opacity: 1,
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bullet: true,
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mouse: true,
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photo: DEFAULT_PHOTO,
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bgBlurred: true,
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bgOriginal: false,
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bgBlur: 0,
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sway: true,
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parallax: 1,
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bgVeil: 1,
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}
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/** 每个滑块的范围(和 AppearanceSettings 里同名的数值项对应)。 */
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export const APPEARANCE_RANGES = {
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density: { min: 0.2, max: 3, step: 0.05 },
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speed: { min: 0.3, max: 3, step: 0.05 },
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wind: { min: 0, max: 3, step: 0.05 },
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size: { min: 0.5, max: 2.5, step: 0.05 },
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blur: { min: 0, max: 2, step: 0.05 },
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opacity: { min: 0.2, max: 2.5, step: 0.05 },
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bgBlur: { min: 0, max: 30, step: 1 },
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parallax: { min: 0, max: 1.5, step: 0.05 },
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bgVeil: { min: 0, max: 1.6, step: 0.05 },
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} as const
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const KEY = 'moshiro.appearance'
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const listeners = new Set<() => void>()
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function load(): AppearanceSettings {
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try {
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const saved = JSON.parse(localStorage.getItem(KEY) ?? '{}') as Partial<AppearanceSettings>
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const merged: Record<string, unknown> = { ...APPEARANCE_DEFAULTS }
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for (const name of Object.keys(APPEARANCE_DEFAULTS) as (keyof AppearanceSettings)[]) {
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const value = saved[name]
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if (typeof value !== typeof APPEARANCE_DEFAULTS[name]) continue
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// 照片只认列表里有的,图删了、改名了就回到默认
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if (name === 'photo' && !PHOTOS.some((photo) => photo.id === value)) continue
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merged[name] = value
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}
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return merged as unknown as AppearanceSettings
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} catch {
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return { ...APPEARANCE_DEFAULTS }
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}
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}
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let current = load()
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export const getAppearance = () => current
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export function setAppearance(patch: Partial<AppearanceSettings>) {
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current = { ...current, ...patch }
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try {
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localStorage.setItem(KEY, JSON.stringify(current))
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} catch {
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// 存不了(隐私模式等)就只在这次打开期间有效
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}
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listeners.forEach((listener) => listener())
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}
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export const resetAppearance = (keys: (keyof AppearanceSettings)[]) =>
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setAppearance(Object.fromEntries(keys.map((name) => [name, APPEARANCE_DEFAULTS[name]])) as Partial<AppearanceSettings>)
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export function subscribeAppearance(listener: () => void): () => void {
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listeners.add(listener)
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return () => listeners.delete(listener)
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}
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export const useAppearance = () => useSyncExternalStore(subscribeAppearance, getAppearance)
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/**
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* 把当前该用的背景图写进 <html> 的 --bg-image(照片、主题、背景模糊、不压缩一起决定用哪个版本;display.css 里 .bg-layer 用它),
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* 把遮罩的浓度写进 --bg-veil-scale,把背景的额外模糊写进 --bg-filter(不模糊的时候是 none,不给浏览器多一层滤镜),
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* 把晃动的开关写进 data-sway(关了就按窗口的原始比例铺满,display.css 里 data-sway='off')。切换主题时也重新算。
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*/
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export function useAppearanceVars() {
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useEffect(() => {
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const root = document.documentElement
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const apply = () => {
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const { bgBlur, bgBlurred, bgOriginal, photo, bgVeil, sway } = getAppearance()
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root.style.setProperty('--bg-veil-scale', String(bgVeil))
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root.style.setProperty('--bg-filter', bgBlurred && bgBlur > 0 ? `blur(${bgBlur}px)` : 'none')
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root.style.setProperty('--bg-image', `url("${backgroundUrl(photo, root.dataset.theme === 'dark', bgBlurred, bgOriginal)}")`)
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root.dataset.sway = sway ? 'on' : 'off'
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}
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apply()
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const observer = new MutationObserver(apply)
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observer.observe(root, { attributes: true, attributeFilter: ['data-theme'] })
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const unsubscribe = subscribeAppearance(apply)
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return () => {
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observer.disconnect()
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unsubscribe()
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}
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}, [])
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}
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