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90
docs/assets/js/useThemeTransition.js
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90
docs/assets/js/useThemeTransition.js
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function useThemeTransition() {
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// 更新过渡样式变量
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function updateViewTransitionVariables(isDarkTheme) {
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document.documentElement.style.setProperty('--view-transition-z-index-foreground', isDarkTheme ? '999' : '1')
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document.documentElement.style.setProperty('--view-transition-z-index-background', isDarkTheme ? '1' : '999')
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}
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// 切换主题按钮点击事件
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function handleThemeToggle(e) {
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// 阻止默认点击事件
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e.preventDefault()
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e.stopPropagation()
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// 获取目标输入元素
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const targetId = this.getAttribute('for')
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const targetInput = document.getElementById(targetId)
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if (!targetInput) return
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// 获取主题状态
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const targetTheme = targetInput.getAttribute('data-md-color-scheme') // 目标主题(system、default、slate)
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const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches ? 'slate' : 'default' // 系统主题(default、slate)
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const currentScheme = document.body.getAttribute('data-md-color-scheme') // 当前主题(default、slate)
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// 当目标主题与当前主题相同时不触发动画
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if (targetTheme === 'system') {
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if (systemTheme === currentScheme) {
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targetInput.click()
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return
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}
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} else if (targetTheme === currentScheme) {
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targetInput.click()
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return
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}
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// 当前主题状态
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const isSystemDarkTheme = systemTheme === 'slate' // 系统是否为深色主题
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const isCurrentDarkTheme = currentScheme.includes('slate') // 当前是否为深色主题
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const isSwitchToDarkTheme = !isCurrentDarkTheme // 是否将切换到深色主题
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// 根据系统主题设置动画样式
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updateViewTransitionVariables(isSystemDarkTheme)
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// 判断切换方向是否与系统主题一致
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// 如果系统是深色,切换到深色是"靠近系统";如果系统是浅色,切换到浅色是"靠近系统"
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const isMovingTowardsSystemTheme = (isSwitchToDarkTheme && isSystemDarkTheme) || (!isSwitchToDarkTheme && !isSystemDarkTheme)
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// 动画参数
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const x = e.clientX
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const y = e.clientY
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const endRadius = Math.hypot(Math.max(x, window.innerWidth - x), Math.max(y, window.innerHeight - y))
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const clipPath = [`circle(0px at ${x}px ${y}px)`, `circle(${endRadius}px at ${x}px ${y}px)`]
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// 启动视图过渡
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document
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.startViewTransition(async () => {
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// 切换主题
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targetInput.click()
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// 添加CSS类用于动画控制
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document.documentElement.classList.remove(isSwitchToDarkTheme ? 'light' : 'dark')
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document.documentElement.classList.add(isSwitchToDarkTheme ? 'dark' : 'light')
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// 等待主题变化完成
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await new Promise((resolve) => setTimeout(resolve, 100))
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})
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.ready.then(() => {
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// 当朝向系统主题方向变化时使用使用缩小效果(reversed clipPath),反之放大效果(clipPath)
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document.documentElement.animate(
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{
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clipPath: isMovingTowardsSystemTheme ? [...clipPath].reverse() : clipPath,
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transform: 'translateZ(0)',
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},
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{
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duration: 500,
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easing: 'ease-in',
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pseudoElement: isMovingTowardsSystemTheme ? '::view-transition-old(root)' : '::view-transition-new(root)',
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}
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)
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})
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}
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// 不支持此特性
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if (typeof document.startViewTransition !== 'function') {
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return
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}
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// 获取主题切换按钮Dom
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const themeToggles = document.querySelectorAll('form[data-md-component="palette"] .md-header__button.md-icon')
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themeToggles.forEach((toggle) => {
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toggle.addEventListener('click', handleThemeToggle, { capture: true })
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})
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// 初始化主题状态类
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const currentScheme = document.body.getAttribute('data-md-color-scheme')
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const isDark = currentScheme.includes('slate')
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document.documentElement.classList.add(isDark ? 'dark' : 'light')
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// 初始化过渡样式变量
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updateViewTransitionVariables(isDark)
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}
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document.addEventListener('DOMContentLoaded', function () {
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useThemeTransition()
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})
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