| <template> | |
| 	<view class="u-tabs"> | |
| 		<view class="u-tabs__wrapper"> | |
| 			<slot name="left" /> | |
| 			<view class="u-tabs__wrapper__scroll-view-wrapper"> | |
| 				<scroll-view | |
| 					:scroll-x="scrollable" | |
| 					:scroll-left="scrollLeft" | |
| 					scroll-with-animation | |
| 					class="u-tabs__wrapper__scroll-view" | |
| 					:show-scrollbar="false" | |
| 					ref="u-tabs__wrapper__scroll-view" | |
| 				> | |
| 					<view | |
| 						class="u-tabs__wrapper__nav" | |
| 						ref="u-tabs__wrapper__nav" | |
| 					> | |
| 						<view | |
| 							class="u-tabs__wrapper__nav__item" | |
| 							v-for="(item, index) in list" | |
| 							:key="index" | |
| 							@tap="clickHandler(item, index)" | |
| 							@longpress="longPressHandler(item,index)" | |
| 							:ref="`u-tabs__wrapper__nav__item-${index}`" | |
| 							:style="[$u.addStyle(itemStyle), {flex: scrollable ? '' : 1}]" | |
| 							:class="[`u-tabs__wrapper__nav__item-${index}`, item.disabled && 'u-tabs__wrapper__nav__item--disabled']" | |
| 						> | |
| 							<text | |
| 								:class="[item.disabled && 'u-tabs__wrapper__nav__item__text--disabled']" | |
| 								class="u-tabs__wrapper__nav__item__text" | |
| 								:style="[textStyle(index)]" | |
| 							>{{ item[keyName] }}</text> | |
| 							<u-badge | |
| 								:show="!!(item.badge && (item.badge.show || item.badge.isDot || item.badge.value))" | |
| 								:isDot="item.badge && item.badge.isDot || propsBadge.isDot" | |
| 								:value="item.badge && item.badge.value || propsBadge.value" | |
| 								:max="item.badge && item.badge.max || propsBadge.max" | |
| 								:type="item.badge && item.badge.type || propsBadge.type" | |
| 								:showZero="item.badge && item.badge.showZero || propsBadge.showZero" | |
| 								:bgColor="item.badge && item.badge.bgColor || propsBadge.bgColor" | |
| 								:color="item.badge && item.badge.color || propsBadge.color" | |
| 								:shape="item.badge && item.badge.shape || propsBadge.shape" | |
| 								:numberType="item.badge && item.badge.numberType || propsBadge.numberType" | |
| 								:inverted="item.badge && item.badge.inverted || propsBadge.inverted" | |
| 								customStyle="margin-left: 4px;" | |
| 							></u-badge> | |
| 						</view> | |
| 						<!-- #ifdef APP-NVUE --> | |
| 						<view | |
| 							class="u-tabs__wrapper__nav__line" | |
| 							ref="u-tabs__wrapper__nav__line" | |
| 							:style="[{ | |
| 									width: $u.addUnit(lineWidth), | |
| 									height: $u.addUnit(lineHeight), | |
| 									background: lineColor, | |
| 									backgroundSize: lineBgSize, | |
| 								}]" | |
| 						> | |
| 							<!-- #endif --> | |
| 							<!-- #ifndef APP-NVUE --> | |
| 							<view | |
| 								class="u-tabs__wrapper__nav__line" | |
| 								ref="u-tabs__wrapper__nav__line" | |
| 								:style="[{ | |
| 										width: $u.addUnit(lineWidth), | |
| 										transform: `translate(${lineOffsetLeft}px)`, | |
| 										transitionDuration: `${firstTime ? 0 : duration}ms`, | |
| 										height: $u.addUnit(lineHeight), | |
| 										background: lineColor, | |
| 										backgroundSize: lineBgSize, | |
| 									}]" | |
| 							> | |
| 								<!-- #endif --> | |
| 							</view> | |
| 						</view> | |
| 				</scroll-view> | |
| 			</view> | |
| 			<slot name="right" /> | |
| 		</view> | |
| 	</view> | |
| </template> | |
|  | |
| <script> | |
| 	// #ifdef APP-NVUE | |
| 	const animation = uni.requireNativePlugin('animation') | |
| 	const dom = uni.requireNativePlugin('dom') | |
| 	// #endif | |
| 	import props from './props.js'; | |
| 	/** | |
| 	 * Tabs 标签 | |
| 	 * @description tabs标签组件,在标签多的时候,可以配置为左右滑动,标签少的时候,可以禁止滑动。 该组件的一个特点是配置为滚动模式时,激活的tab会自动移动到组件的中间位置。 | |
| 	 * @tutorial https://www.uviewui.com/components/tabs.html | |
| 	 * @property {String | Number}	duration			滑块移动一次所需的时间,单位秒(默认 200 ) | |
| 	 * @property {String | Number}	swierWidth			swiper的宽度(默认 '750rpx' ) | |
| 	 * @property {String}	keyName	 从`list`元素对象中读取的键名(默认 'name' ) | |
| 	 * @event {Function(index)} change 标签改变时触发 index: 点击了第几个tab,索引从0开始 | |
| 	 * @event {Function(index)} click 点击标签时触发 index: 点击了第几个tab,索引从0开始 | |
|   	 * @event {Function(index)} longPress 长按标签时触发 index: 点击了第几个tab,索引从0开始 | |
| 	 * @example <u-tabs :list="list" :is-scroll="false" :current="current" @change="change" @longPress="longPress"></u-tabs> | |
| 	 */ | |
| 	export default { | |
| 		name: 'u-tabs', | |
| 		mixins: [uni.$u.mpMixin, uni.$u.mixin, props], | |
| 		data() { | |
| 			return { | |
| 				firstTime: true, | |
| 				scrollLeft: 0, | |
| 				scrollViewWidth: 0, | |
| 				lineOffsetLeft: 0, | |
| 				tabsRect: { | |
| 					left: 0 | |
| 				}, | |
| 				innerCurrent: 0, | |
| 				moving: false, | |
| 			} | |
| 		}, | |
| 		watch: { | |
| 			current: { | |
| 				immediate: true, | |
| 				handler (newValue, oldValue) { | |
| 					// 内外部值不相等时,才尝试移动滑块 | |
| 					if (newValue !== this.innerCurrent) { | |
| 						this.innerCurrent = newValue | |
| 						this.$nextTick(() => { | |
| 							this.resize() | |
| 						}) | |
| 					} | |
| 				} | |
| 			}, | |
| 			// list变化时,重新渲染list各项信息 | |
| 			list() { | |
| 				this.$nextTick(() => { | |
| 					this.resize() | |
| 				}) | |
| 			} | |
| 		}, | |
| 		computed: { | |
| 			textStyle() { | |
| 				return index => { | |
| 					const style = {} | |
| 					// 取当期是否激活的样式 | |
| 					const customeStyle = index === this.innerCurrent ? uni.$u.addStyle(this.activeStyle) : uni.$u | |
| 						.addStyle( | |
| 							this.inactiveStyle) | |
| 					// 如果当前菜单被禁用,则加上对应颜色,需要在此做处理,是因为nvue下,无法在style样式中通过!import覆盖标签的内联样式 | |
| 					if (this.list[index].disabled) { | |
| 						style.color = '#c8c9cc' | |
| 					} | |
| 					return uni.$u.deepMerge(customeStyle, style) | |
| 				} | |
| 			}, | |
| 			propsBadge() { | |
| 				return uni.$u.props.badge | |
| 			} | |
| 		}, | |
| 		async mounted() { | |
| 			this.init() | |
| 		}, | |
| 		methods: { | |
| 			setLineLeft() { | |
| 				const tabItem = this.list[this.innerCurrent]; | |
| 				if (!tabItem) { | |
| 					return; | |
| 				} | |
| 				// 获取滑块该移动的位置 | |
| 				let lineOffsetLeft = this.list | |
| 					.slice(0, this.innerCurrent) | |
| 					.reduce((total, curr) => total + curr.rect.width, 0); | |
|                 // 获取下划线的数值px表示法 | |
| 				const lineWidth = uni.$u.getPx(this.lineWidth); | |
| 				this.lineOffsetLeft = lineOffsetLeft + (tabItem.rect.width - lineWidth) / 2 | |
| 				// #ifdef APP-NVUE | |
| 				// 第一次移动滑块,无需过渡时间 | |
| 				this.animation(this.lineOffsetLeft, this.firstTime ? 0 : parseInt(this.duration)) | |
| 				// #endif | |
|  | |
| 				// 如果是第一次执行此方法,让滑块在初始化时,瞬间滑动到第一个tab item的中间 | |
| 				// 这里需要一个定时器,因为在非nvue下,是直接通过style绑定过渡时间,需要等其过渡完成后,再设置为false(非第一次移动滑块) | |
| 				if (this.firstTime) { | |
| 					setTimeout(() => { | |
| 						this.firstTime = false | |
| 					}, 10); | |
| 				} | |
| 			}, | |
| 			// nvue下设置滑块的位置 | |
| 			animation(x, duration = 0) { | |
| 				// #ifdef APP-NVUE | |
| 				const ref = this.$refs['u-tabs__wrapper__nav__line'] | |
| 				animation.transition(ref, { | |
| 					styles: { | |
| 						transform: `translateX(${x}px)` | |
| 					}, | |
| 					duration | |
| 				}) | |
| 				// #endif | |
| 			}, | |
| 			// 点击某一个标签 | |
| 			clickHandler(item, index) { | |
| 				// 因为标签可能为disabled状态,所以click是一定会发出的,但是change事件是需要可用的状态才发出 | |
| 				this.$emit('click', { | |
| 					...item, | |
| 					index | |
| 				}) | |
| 				// 如果disabled状态,返回 | |
| 				if (item.disabled) return | |
| 				this.innerCurrent = index | |
| 				this.resize() | |
| 				this.$emit('change', { | |
| 					...item, | |
| 					index | |
| 				}) | |
| 			}, | |
| 			// 长按事件 | |
| 			longPressHandler(item, index) { | |
| 				this.$emit('longPress', { | |
| 					...item, | |
| 					index | |
| 				}) | |
| 			}, | |
| 			init() { | |
| 				uni.$u.sleep().then(() => { | |
| 					this.resize() | |
| 				}) | |
| 			}, | |
| 			setScrollLeft() { | |
| 				// 当前活动tab的布局信息,有tab菜单的width和left(为元素左边界到父元素左边界的距离)等信息 | |
| 				const tabRect = this.list[this.innerCurrent] | |
| 				// 累加得到当前item到左边的距离 | |
| 				const offsetLeft = this.list | |
| 					.slice(0, this.innerCurrent) | |
| 					.reduce((total, curr) => { | |
| 						return total + curr.rect.width | |
| 					}, 0) | |
| 				// 此处为屏幕宽度 | |
| 				const windowWidth = uni.$u.sys().windowWidth | |
| 				// 将活动的tabs-item移动到屏幕正中间,实际上是对scroll-view的移动 | |
| 				let scrollLeft = offsetLeft - (this.tabsRect.width - tabRect.rect.width) / 2 - (windowWidth - this.tabsRect | |
| 					.right) / 2 + this.tabsRect.left / 2 | |
| 				// 这里做一个限制,限制scrollLeft的最大值为整个scroll-view宽度减去tabs组件的宽度 | |
| 				scrollLeft = Math.min(scrollLeft, this.scrollViewWidth - this.tabsRect.width) | |
| 				this.scrollLeft = Math.max(0, scrollLeft) | |
| 			}, | |
| 			// 获取所有标签的尺寸 | |
| 			resize() { | |
| 				// 如果不存在list,则不处理 | |
| 				if(this.list.length === 0) { | |
| 					return | |
| 				} | |
| 				Promise.all([this.getTabsRect(), this.getAllItemRect()]).then(([tabsRect, itemRect = []]) => { | |
| 					this.tabsRect = tabsRect | |
| 					this.scrollViewWidth = 0 | |
| 					itemRect.map((item, index) => { | |
| 						// 计算scroll-view的宽度,这里 | |
| 						this.scrollViewWidth += item.width | |
| 						// 另外计算每一个item的中心点X轴坐标 | |
| 						this.list[index].rect = item | |
| 					}) | |
| 					// 获取了tabs的尺寸之后,设置滑块的位置 | |
| 					this.setLineLeft() | |
| 					this.setScrollLeft() | |
| 				}) | |
| 			}, | |
| 			// 获取导航菜单的尺寸 | |
| 			getTabsRect() { | |
| 				return new Promise(resolve => { | |
| 					this.queryRect('u-tabs__wrapper__scroll-view').then(size => resolve(size)) | |
| 				}) | |
| 			}, | |
| 			// 获取所有标签的尺寸 | |
| 			getAllItemRect() { | |
| 				return new Promise(resolve => { | |
| 					const promiseAllArr = this.list.map((item, index) => this.queryRect( | |
| 						`u-tabs__wrapper__nav__item-${index}`, true)) | |
| 					Promise.all(promiseAllArr).then(sizes => resolve(sizes)) | |
| 				}) | |
| 			}, | |
| 			// 获取各个标签的尺寸 | |
| 			queryRect(el, item) { | |
| 				// #ifndef APP-NVUE | |
| 				// $uGetRect为uView自带的节点查询简化方法,详见文档介绍:https://www.uviewui.com/js/getRect.html | |
| 				// 组件内部一般用this.$uGetRect,对外的为uni.$u.getRect,二者功能一致,名称不同 | |
| 				return new Promise(resolve => { | |
| 					this.$uGetRect(`.${el}`).then(size => { | |
| 						resolve(size) | |
| 					}) | |
| 				}) | |
| 				// #endif | |
|  | |
| 				// #ifdef APP-NVUE | |
| 				// nvue下,使用dom模块查询元素高度 | |
| 				// 返回一个promise,让调用此方法的主体能使用then回调 | |
| 				return new Promise(resolve => { | |
| 					dom.getComponentRect(item ? this.$refs[el][0] : this.$refs[el], res => { | |
| 						resolve(res.size) | |
| 					}) | |
| 				}) | |
| 				// #endif | |
| 			}, | |
| 		}, | |
| 	} | |
| </script> | |
| 
 | |
| <style lang="scss" scoped> | |
| 	@import "../../libs/css/components.scss"; | |
| 
 | |
| 	.u-tabs { | |
| 
 | |
| 		&__wrapper { | |
| 			@include flex; | |
| 			align-items: center; | |
| 
 | |
| 			&__scroll-view-wrapper { | |
| 				flex: 1; | |
| 				/* #ifndef APP-NVUE */ | |
| 				overflow: auto hidden; | |
| 				/* #endif */ | |
| 			} | |
| 
 | |
| 			&__scroll-view { | |
| 				@include flex; | |
| 				flex: 1; | |
| 			} | |
| 
 | |
| 			&__nav { | |
| 				@include flex; | |
| 				position: relative; | |
| 
 | |
| 				&__item { | |
| 					padding: 0 11px; | |
| 					@include flex; | |
| 					align-items: center; | |
| 					justify-content: center; | |
| 
 | |
| 					&--disabled { | |
| 						/* #ifndef APP-NVUE */ | |
| 						cursor: not-allowed; | |
| 						/* #endif */ | |
| 					} | |
| 
 | |
| 					&__text { | |
| 						font-size: 15px; | |
| 						color: $u-content-color; | |
| 
 | |
| 						&--disabled { | |
| 							color: $u-disabled-color !important; | |
| 						} | |
| 					} | |
| 				} | |
| 
 | |
| 				&__line { | |
| 					height: 3px; | |
| 					background: $u-primary; | |
| 					width: 30px; | |
| 					position: absolute; | |
| 					bottom: 2px; | |
| 					border-radius: 100px; | |
| 					transition-property: transform; | |
| 					transition-duration: 300ms; | |
| 				} | |
| 			} | |
| 		} | |
| 	} | |
| </style>
 |