u-tabs.vue 11 KB

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  1. <template>
  2. <view class="u-tabs">
  3. <view class="u-tabs__wrapper">
  4. <slot name="left" />
  5. <view class="u-tabs__wrapper__scroll-view-wrapper">
  6. <scroll-view
  7. :scroll-x="scrollable"
  8. :scroll-left="scrollLeft"
  9. scroll-with-animation
  10. class="u-tabs__wrapper__scroll-view"
  11. :show-scrollbar="false"
  12. ref="u-tabs__wrapper__scroll-view"
  13. >
  14. <view
  15. class="u-tabs__wrapper__nav"
  16. ref="u-tabs__wrapper__nav"
  17. >
  18. <view
  19. class="u-tabs__wrapper__nav__item"
  20. v-for="(item, index) in list"
  21. :key="index"
  22. @tap="clickHandler(item, index)"
  23. :ref="`u-tabs__wrapper__nav__item-${index}`"
  24. :style="[$u.addStyle(itemStyle), {flex: scrollable ? '' : 1}]"
  25. :class="[`u-tabs__wrapper__nav__item-${index}`, item.disabled && 'u-tabs__wrapper__nav__item--disabled']"
  26. >
  27. <text
  28. :class="[item.disabled && 'u-tabs__wrapper__nav__item__text--disabled']"
  29. class="u-tabs__wrapper__nav__item__text"
  30. :style="[textStyle(index)]"
  31. >{{ item[keyName] }}</text>
  32. <u-badge
  33. :show="!!(item.badge && (item.badge.show || item.badge.isDot || item.badge.value))"
  34. :isDot="item.badge && item.badge.isDot || propsBadge.isDot"
  35. :value="item.badge && item.badge.value || propsBadge.value"
  36. :max="item.badge && item.badge.max || propsBadge.max"
  37. :type="item.badge && item.badge.type || propsBadge.type"
  38. :showZero="item.badge && item.badge.showZero || propsBadge.showZero"
  39. :bgColor="item.badge && item.badge.bgColor || propsBadge.bgColor"
  40. :color="item.badge && item.badge.color || propsBadge.color"
  41. :shape="item.badge && item.badge.shape || propsBadge.shape"
  42. :numberType="item.badge && item.badge.numberType || propsBadge.numberType"
  43. :inverted="item.badge && item.badge.inverted || propsBadge.inverted"
  44. customStyle="margin-left: 4px;"
  45. ></u-badge>
  46. </view>
  47. <!-- #ifdef APP-NVUE -->
  48. <view
  49. class="u-tabs__wrapper__nav__line"
  50. ref="u-tabs__wrapper__nav__line"
  51. :style="[{
  52. width: $u.addUnit(lineWidth),
  53. height: $u.addUnit(lineHeight),
  54. background: lineColor,
  55. backgroundSize: lineBgSize,
  56. }]"
  57. >
  58. </view>
  59. <!-- #endif -->
  60. <!-- #ifndef APP-NVUE -->
  61. <view
  62. class="u-tabs__wrapper__nav__line"
  63. ref="u-tabs__wrapper__nav__line"
  64. :style="[{
  65. width: $u.addUnit(lineWidth),
  66. transform: `translate(${lineOffsetLeft}px)`,
  67. transitionDuration: `${firstTime ? 0 : duration}ms`,
  68. height: $u.addUnit(lineHeight),
  69. background: lineColor,
  70. backgroundSize: lineBgSize,
  71. }]"
  72. >
  73. </view>
  74. <!-- #endif -->
  75. </view>
  76. </scroll-view>
  77. </view>
  78. <slot name="right" />
  79. </view>
  80. </view>
  81. </template>
  82. <script>
  83. // #ifdef APP-NVUE
  84. const animation = uni.requireNativePlugin('animation')
  85. const dom = uni.requireNativePlugin('dom')
  86. // #endif
  87. import props from './props.js';
  88. import mpMixin from '../../libs/mixin/mpMixin.js';
  89. import mixin from '../../libs/mixin/mixin.js';
  90. /**
  91. * Tabs 标签
  92. * @description tabs标签组件,在标签多的时候,可以配置为左右滑动,标签少的时候,可以禁止滑动。 该组件的一个特点是配置为滚动模式时,激活的tab会自动移动到组件的中间位置。
  93. * @tutorial https://ijry.github.io/uview-plus/components/tabs.html
  94. * @property {String | Number} duration 滑块移动一次所需的时间,单位秒(默认 200 )
  95. * @property {String | Number} swierWidth swiper的宽度(默认 '750rpx' )
  96. * @property {String} keyName 从`list`元素对象中读取的键名(默认 'name' )
  97. * @event {Function(index)} change 标签改变时触发 index: 点击了第几个tab,索引从0开始
  98. * @event {Function(index)} click 点击标签时触发 index: 点击了第几个tab,索引从0开始
  99. * @example <u-tabs :list="list" :is-scroll="false" :current="current" @change="change"></u-tabs>
  100. */
  101. export default {
  102. name: 'u-tabs',
  103. mixins: [mpMixin, mixin, props],
  104. data() {
  105. return {
  106. firstTime: true,
  107. scrollLeft: 0,
  108. scrollViewWidth: 0,
  109. lineOffsetLeft: 0,
  110. tabsRect: {
  111. left: 0
  112. },
  113. innerCurrent: 0,
  114. moving: false,
  115. }
  116. },
  117. watch: {
  118. current: {
  119. immediate: true,
  120. handler (newValue, oldValue) {
  121. // 内外部值不相等时,才尝试移动滑块
  122. if (newValue !== this.innerCurrent) {
  123. this.innerCurrent = newValue
  124. this.$nextTick(() => {
  125. this.resize()
  126. })
  127. }
  128. }
  129. },
  130. // list变化时,重新渲染list各项信息
  131. list() {
  132. this.$nextTick(() => {
  133. this.resize()
  134. })
  135. }
  136. },
  137. computed: {
  138. textStyle() {
  139. return index => {
  140. const style = {}
  141. // 取当期是否激活的样式
  142. const customeStyle = index === this.innerCurrent ? uni.$u.addStyle(this.activeStyle) : uni.$u
  143. .addStyle(
  144. this.inactiveStyle)
  145. // 如果当前菜单被禁用,则加上对应颜色,需要在此做处理,是因为nvue下,无法在style样式中通过!import覆盖标签的内联样式
  146. if (this.list[index].disabled) {
  147. style.color = '#c8c9cc'
  148. }
  149. return uni.$u.deepMerge(customeStyle, style)
  150. }
  151. },
  152. propsBadge() {
  153. return uni.$u.props.badge
  154. }
  155. },
  156. async mounted() {
  157. this.init()
  158. },
  159. emits: ['click', 'change'],
  160. methods: {
  161. setLineLeft() {
  162. const tabItem = this.list[this.innerCurrent];
  163. if (!tabItem) {
  164. return;
  165. }
  166. // 获取滑块该移动的位置
  167. let lineOffsetLeft = this.list
  168. .slice(0, this.innerCurrent)
  169. .reduce((total, curr) => total + curr.rect.width, 0);
  170. // 获取下划线的数值px表示法
  171. const lineWidth = uni.$u.getPx(this.lineWidth);
  172. this.lineOffsetLeft = lineOffsetLeft + (tabItem.rect.width - lineWidth) / 2
  173. // #ifdef APP-NVUE
  174. // 第一次移动滑块,无需过渡时间
  175. this.animation(this.lineOffsetLeft, this.firstTime ? 0 : parseInt(this.duration))
  176. // #endif
  177. // 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
  178. // 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)
  179. if (this.firstTime) {
  180. setTimeout(() => {
  181. this.firstTime = false
  182. }, 10);
  183. }
  184. },
  185. // nvue下设置滑块的位置
  186. animation(x, duration = 0) {
  187. // #ifdef APP-NVUE
  188. const ref = this.$refs['u-tabs__wrapper__nav__line']
  189. animation.transition(ref, {
  190. styles: {
  191. transform: `translateX(${x}px)`
  192. },
  193. duration
  194. })
  195. // #endif
  196. },
  197. // 点击某一个标签
  198. clickHandler(item, index) {
  199. // 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
  200. this.$emit('click', {
  201. ...item,
  202. index
  203. })
  204. // 如果disabled状态,返回
  205. if (item.disabled) return
  206. this.innerCurrent = index
  207. this.resize()
  208. this.$emit('change', {
  209. ...item,
  210. index
  211. })
  212. },
  213. init() {
  214. uni.$u.sleep().then(() => {
  215. this.resize()
  216. })
  217. },
  218. setScrollLeft() {
  219. // 当前活动tab的布局信息,有tab菜单的width和left(为元素左边界到父元素左边界的距离)等信息
  220. const tabRect = this.list[this.innerCurrent]
  221. // 累加得到当前item到左边的距离
  222. const offsetLeft = this.list
  223. .slice(0, this.innerCurrent)
  224. .reduce((total, curr) => {
  225. return total + curr.rect.width
  226. }, 0)
  227. // 此处为屏幕宽度
  228. const windowWidth = uni.$u.sys().windowWidth
  229. // 将活动的tabs-item移动到屏幕正中间,实际上是对scroll-view的移动
  230. let scrollLeft = offsetLeft - (this.tabsRect.width - tabRect.rect.width) / 2 - (windowWidth - this.tabsRect
  231. .right) / 2 + this.tabsRect.left / 2
  232. // 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
  233. scrollLeft = Math.min(scrollLeft, this.scrollViewWidth - this.tabsRect.width)
  234. this.scrollLeft = Math.max(0, scrollLeft)
  235. },
  236. // 获取所有标签的尺寸
  237. resize() {
  238. // 如果不存在list,则不处理
  239. if(this.list.length === 0) {
  240. return
  241. }
  242. Promise.all([this.getTabsRect(), this.getAllItemRect()]).then(([tabsRect, itemRect = []]) => {
  243. this.tabsRect = tabsRect
  244. this.scrollViewWidth = 0
  245. itemRect.map((item, index) => {
  246. // 计算scroll-view的宽度,这里
  247. this.scrollViewWidth += item.width
  248. // 另外计算每一个item的中心点X轴坐标
  249. this.list[index].rect = item
  250. })
  251. // 获取了tabs的尺寸之后,设置滑块的位置
  252. this.setLineLeft()
  253. this.setScrollLeft()
  254. })
  255. },
  256. // 获取导航菜单的尺寸
  257. getTabsRect() {
  258. return new Promise(resolve => {
  259. this.queryRect('u-tabs__wrapper__scroll-view').then(size => resolve(size))
  260. })
  261. },
  262. // 获取所有标签的尺寸
  263. getAllItemRect() {
  264. return new Promise(resolve => {
  265. const promiseAllArr = this.list.map((item, index) => this.queryRect(
  266. `u-tabs__wrapper__nav__item-${index}`, true))
  267. Promise.all(promiseAllArr).then(sizes => resolve(sizes))
  268. })
  269. },
  270. // 获取各个标签的尺寸
  271. queryRect(el, item) {
  272. // #ifndef APP-NVUE
  273. // $uGetRect为uView自带的节点查询简化方法,详见文档介绍:https://ijry.github.io/uview-plus/js/getRect.html
  274. // 组件内部一般用this.$uGetRect,对外的为uni.$u.getRect,二者功能一致,名称不同
  275. return new Promise(resolve => {
  276. this.$uGetRect(`.${el}`).then(size => {
  277. resolve(size)
  278. })
  279. })
  280. // #endif
  281. // #ifdef APP-NVUE
  282. // nvue下,使用dom模块查询元素高度
  283. // 返回一个promise,让调用此方法的主体能使用then回调
  284. return new Promise(resolve => {
  285. dom.getComponentRect(item ? this.$refs[el][0] : this.$refs[el], res => {
  286. resolve(res.size)
  287. })
  288. })
  289. // #endif
  290. },
  291. },
  292. }
  293. </script>
  294. <style lang="scss" scoped>
  295. @import "../../libs/css/components.scss";
  296. .u-tabs {
  297. &__wrapper {
  298. @include flex;
  299. align-items: center;
  300. &__scroll-view-wrapper {
  301. flex: 1;
  302. /* #ifndef APP-NVUE */
  303. overflow: auto hidden;
  304. /* #endif */
  305. }
  306. &__scroll-view {
  307. @include flex;
  308. flex: 1;
  309. }
  310. &__nav {
  311. @include flex;
  312. position: relative;
  313. &__item {
  314. padding: 0 11px;
  315. @include flex;
  316. align-items: center;
  317. justify-content: center;
  318. &--disabled {
  319. /* #ifndef APP-NVUE */
  320. cursor: not-allowed;
  321. /* #endif */
  322. }
  323. &__text {
  324. font-size: 15px;
  325. color: $u-content-color;
  326. &--disabled {
  327. color: $u-disabled-color !important;
  328. }
  329. }
  330. }
  331. &__line {
  332. height: 3px;
  333. background: $u-primary;
  334. width: 30px;
  335. position: absolute;
  336. bottom: 2px;
  337. border-radius: 100px;
  338. transition-property: transform;
  339. transition-duration: 300ms;
  340. }
  341. }
  342. }
  343. }
  344. </style>