feat(cdk:theme): add cdk theme support

packages/cdk/index.ts

@@ -54,5 +54,6 @@ export * from '@idux/cdk/popper'
 export * from '@idux/cdk/portal'
 export * from '@idux/cdk/resize'
 export * from '@idux/cdk/scroll'
+export * from '@idux/cdk/theme'
 export * from '@idux/cdk/utils'
 export * from '@idux/cdk/version'

packages/cdk/theme/demo/Basic.md

@@ -0,0 +1,12 @@
+---
+order: 0
+title:
+  zh: 基本使用
+  en: Basic usage
+---
+
+## zh
+
+主题切换
+
+## en

packages/cdk/theme/demo/Basic.vue

@@ -0,0 +1,22 @@
+<template>
+  <div>
+    <h2>Platform:</h2>
+    <p>Is Browser: {{ isBrowser }}</p>
+    <p>Is Blink: {{ isBlink }}</p>
+    <p>Is Webkit: {{ isWebKit }}</p>
+    <p>Is iOS: {{ isIOS }}</p>
+    <p>Is Android: {{ isAndroid }}</p>
+  </div>
+</template>
+
+<script lang="ts">
+import { defineComponent } from 'vue'
+
+import { isAndroid, isBlink, isBrowser, isIOS, isWebKit } from '@idux/cdk/platform'
+
+export default defineComponent({
+  setup() {
+    return { isBrowser, isBlink, isWebKit, isIOS, isAndroid }
+  },
+})
+</script>

packages/cdk/theme/docs/Api.zh.md

@@ -0,0 +1 @@
+## API

packages/cdk/theme/docs/Index.zh.md

@@ -0,0 +1,11 @@
+---
+category: cdk
+type:
+title: Theme
+subtitle: 主题
+cover:
+---
+
+`@idux-vue2/cdk/theme` 提供了一组用于获取、更新主题的响应式工具
+
+需要对不同主题做兼容性处理时使用

packages/cdk/theme/index.ts

@@ -0,0 +1,8 @@
+/**
+ * @license
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://github.com/IDuxFE/idux/blob/main/LICENSE
+ */
+
+export * from './src/useTheme'

packages/cdk/theme/src/useTheme.ts

@@ -0,0 +1,179 @@
+/**
+ * @license
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://github.com/IDuxFE/idux/blob/main/LICENSE
+ */
+
+import { type ComputedRef, onMounted } from 'vue'
+
+import { debounce } from 'lodash-es'
+
+import { Logger, createSharedComposable, tryOnScopeDispose, useState } from '@idux/cdk/utils'
+
+export interface UseThemeParams<Theme extends string> {
+  /**
+   * CSS Selector for the target element applying to
+   *
+   * @default 'body''
+   */
+  selector?: string | Element | null | undefined
+  /**
+   * HTML attribute applying the target element
+   *
+   * @default 'color-schema''
+   */
+  attribute?: string
+
+  /**
+   * The initial value of the theme
+   */
+  defaultTheme?: Theme
+
+  /**
+   * The map of the theme value and the corresponding attribute value
+   */
+  themes?: Theme[]
+
+  /**
+   * Debounce time for updating the theme value
+   */
+  debounceTime?: number
+}
+
+export interface UseThemeReturns<Theme extends string> {
+  theme: ComputedRef<Theme>
+  changeTheme: (theme: Theme) => void
+}
+
+/**
+ * reactivy theme hook
+ */
+export const useTheme = createSharedComposable(
+  <Theme extends string>(options: UseThemeParams<Theme> = {}): UseThemeReturns<Theme> => {
+    const {
+      selector = 'body',
+      attribute = 'color-schema',
+      defaultTheme = 'default' as Theme,
+      themes = [],
+      debounceTime = 300,
+    } = options
+
+    const mergedThemes = [...themes]
+
+    const requiredOptions: Required<UseThemeParams<Theme>> = {
+      selector,
+      attribute,
+      themes: mergedThemes,
+      defaultTheme,
+      debounceTime,
+    }
+
+    const [theme, setTheme] = useState<Theme>(getHTMLAttrs(requiredOptions))
+    const updateThemeAttrs = () => {
+      updateHTMLAttrs(
+        Object.assign({}, requiredOptions, {
+          defaultTheme: theme.value,
+        }),
+      )
+    }
+
+    updateThemeAttrs()
+
+    const changeTheme = (newTheme: Theme) => {
+      setTheme(newTheme)
+      updateThemeAttrs()
+    }
+
+    const onDomChange = debounce(() => {
+      const oldTheme = theme.value
+      const newTheme = getHTMLAttrs(
+        Object.assign({}, requiredOptions, {
+          defaultTheme: theme.value,
+        }),
+      )
+      // 这里需要手动节流一下，否则会重复更新 theme 的值
+      if (oldTheme !== newTheme) {
+        changeTheme(newTheme)
+      }
+    }, debounceTime)
+
+    let observer: MutationObserver
+    onMounted(() => {
+      if (observer) {
+        return
+      }
+      observer = new MutationObserver(onDomChange)
+      const el = getEl(selector)
+      if (el) {
+        observer.observe(el, {
+          attributes: true,
+          attributeFilter: [attribute],
+        })
+      }
+    })
+    tryOnScopeDispose(() => {
+      observer?.disconnect
+    })
+
+    return {
+      theme,
+      changeTheme,
+    }
+  },
+)
+
+function getEl(selector: UseThemeParams<string>['selector']) {
+  const el = typeof selector === 'string' ? window?.document.querySelector(selector) : selector
+
+  if (!el && __DEV__) {
+    Logger.warn('cdk/theme', `The element holding the theme cannot be found.`)
+  }
+
+  return el
+}
+
+/**
+ * Update the HTML attribute of the target element
+ */
+function updateHTMLAttrs<Theme extends string>(options: Required<UseThemeParams<Theme>>) {
+  const { selector, attribute, themes, defaultTheme } = options
+
+  const el = getEl(selector)
+  if (!el) {
+    return
+  }
+
+  if (attribute !== 'class') {
+    el.setAttribute(attribute, defaultTheme)
+    return
+  }
+
+  const currentCls = defaultTheme.split(/\s+/g)
+  Object.values(themes)
+    .flatMap(i => String(i || '').split(/\s/g))
+    .filter(Boolean)
+    .forEach(v => {
+      if (currentCls.includes(v)) {
+        el.classList.add(v)
+      } else {
+        el.classList.remove(v)
+      }
+    })
+}
+
+function getHTMLAttrs<Theme extends string>(options: Required<UseThemeParams<Theme>>): Theme {
+  const { selector, attribute, themes, defaultTheme } = options
+  const el = getEl(selector)
+  if (!el) {
+    return defaultTheme
+  }
+
+  const val = el.getAttribute(attribute) ?? defaultTheme
+  if (attribute !== 'class') {
+    return val as Theme
+  }
+
+  const currentCls = val.split(/\s+/g)
+  return (themes.filter(targetValue => currentCls.includes(targetValue)).at(0) ?? defaultTheme) as Theme
+}