App.k12.Parents/uni_modules/uni-tab-bar/components/uni-tab/uni-tab.uvue

<template>
	<view class="uni-tab-bar-root"> <!-- 如果 tab 是一个非全屏的组件，需要套一层。如果是全屏场景，这一层可以省略 -->
		<slot></slot>
	</view>
</template>

<script setup lang="ts">
  /**
   * 选项卡
   * @description 选项卡容器组件
   * @uniPlatform {
   *   "app": {
   *     "android": {
   *       "uniVer": "x",
   *       "unixVer": "5.07",
   *       "unixVaporVer": "5.21"
   *     },
   *     "ios": {
   *       "uniVer": "x",
   *       "unixVer": "5.07",
   *       "unixVaporVer": "5.11"
   *     },
   *     "harmony": {
   *       "uniVer": "x",
   *       "unixVer": "5.07",
   *       "unixVaporVer": "5.07"
   *     }
   *   },
   *   "mp": {
   *     "weixin": {
   *       "uniVer": "x",
   *       "unixVer": "5.07"
   *     },
   *     "alipay": {
   *       "uniVer": "x",
   *       "unixVer": "5.31"
   *     }
   *   },
   *   "web": {
   *     "uniVer": "x",
   *     "unixVer": "5.07"
   *   }
   * }
   */
type Props = {
	/**
	 * @description 当前激活的选项卡索引
	 * @uniPlatform {
	 *   "app": {
	 *     "android": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07",
	 *       "unixVaporVer": "5.21"
	 *     },
	 *     "ios": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07",
	 *       "unixVaporVer": "5.11"
	 *     },
	 *     "harmony": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07",
	 *       "unixVaporVer": "5.07"
	 *     }
	 *   },
	 *   "mp": {
	 *     "weixin": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07"
	 *     },
	 *     "alipay": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.31"
	 *     }
	 *   },
	 *   "web": {
	 *     "uniVer": "x",
	 *     "unixVer": "5.07"
	 *   }
	 * }
	 */
	activeIndex: number,
	/**
	 * @description tab-content 的高度是否通到tab-bar下面
	 * @uniPlatform {
	 *   "app": {
	 *     "android": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07",
	 *       "unixVaporVer": "5.21"
	 *     },
	 *     "ios": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07",
	 *       "unixVaporVer": "5.11"
	 *     },
	 *     "harmony": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07",
	 *       "unixVaporVer": "5.07"
	 *     }
	 *   },
	 *   "mp": {
	 *     "weixin": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07"
	 *     },
	 *     "alipay": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.31"
	 *     }
	 *   },
	 *   "web": {
	 *     "uniVer": "x",
	 *     "unixVer": "5.07"
	 *   }
	 * }
	 */
	tabContentHeightFull?: boolean
}

// 定义组件属性
const props = withDefaults(defineProps<Props>(), {
	tabContentHeightFull: false
})

// 定义事件
const emit = defineEmits<{
	/**
	 * @description 选项卡变化时触发，参数为当前激活的选项卡索引，类型为 number
	 * @uniPlatform {
	 *   "app": {
	 *     "android": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07",
	 *       "unixVaporVer": "5.21"
	 *     },
	 *     "ios": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07",
	 *       "unixVaporVer": "5.11"
	 *     },
	 *     "harmony": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07",
	 *       "unixVaporVer": "5.07"
	 *     }
	 *   },
	 *   "mp": {
	 *     "weixin": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.07"
	 *     },
	 *     "alipay": {
	 *       "uniVer": "x",
	 *       "unixVer": "5.31"
	 *     }
	 *   },
	 *   "web": {
	 *     "uniVer": "x",
	 *     "unixVer": "5.07"
	 *   }
	 * }
	 */
	change: [index: number]
}>()

// 当前激活的索引
const currentIndex = ref<number>(props.activeIndex)

const tabContentHeightFull = ref<boolean>(props.tabContentHeightFull)

// tab-content 的数量计数器
const contentCount = ref<number>(0)

// 监听 activeIndex 变化
watch((): number => {
	return props.activeIndex
}, (newIndex: number) => {
	currentIndex.value = newIndex
})

watch(() : boolean => {
	return props.tabContentHeightFull
}, () => {
	tabContentHeightFull.value = props.tabContentHeightFull
})

// 切换选项卡
function changeTab(index: number): void {
	if (currentIndex.value != index) {
		currentIndex.value = index
		emit('change', index)
	}
}

// 注册 tab-content
function registerContent() : number {
	const index = contentCount.value
	contentCount.value++
	return index
}

// 通过 provide 向子组件提供数据和方法
provide('uniTabBarCurrentIndex', currentIndex)
provide('uniTabBarChangeTab', changeTab)
provide('uniTabBarRegisterContent', registerContent)
provide('uniTabContentHeightFull', tabContentHeightFull)
</script>

<style>
	.uni-tab-bar-root {
		display: flex;
		flex-direction: column;
		width: 100%;
		height: 100%;
		flex: 1;
		min-height: 0px;
		position: relative;
		overflow: visible;
	}
</style>