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wangxiaowei
349
components/benben-flex-tabs/benben-flex-tabs.vue
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349
components/benben-flex-tabs/benben-flex-tabs.vue
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<template>
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<view :class="className" :style="headStyle" :id="`${selectMark}-box`">
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<view class="benben-flex-tabs" :class="className" :style="[stickyContent]">
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<slot></slot>
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</view>
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</view>
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</template>
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<script>
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let pageInfo = null
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export default {
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components: {},
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name: 'benben-flex-tabs',
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props: {
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className: {
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type: String,
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default: '',
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},
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selectMark: {
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type: String,
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default: 'benben-tabs',
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},
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scrollspy: {
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type: Boolean,
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default: false,
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},
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value: {
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type: [String, Number],
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default: '',
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},
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openSticky: {
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type: Boolean,
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default: false,
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},
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openTitleType: {
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type: Boolean,
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default: false,
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},
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top: {
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type: [String, Number],
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default: 0,
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},
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zIndex: {
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type: [String, Number],
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default: 90,
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},
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isShowContent: {
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type: Boolean,
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default: false,
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},
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isShowLeft: {
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type: Boolean,
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default: false,
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},
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isShowRight: {
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type: Boolean,
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default: false,
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},
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tabsInfo: {
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type: Object,
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default: () => ({
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lineleft: '',
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lineWidth: '',
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moveX: 0,
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scrollX: 0,
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}),
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},
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},
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data() {
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return {
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tabs: [],
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flag: true,
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isScroll: true,
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tabsHeight: 0,
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setTimeoutFn: null,
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flagSetTimeoutFn: null,
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moveX: 0,
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lineWidth: 0,
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lineleft: 0,
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stickyWidth: 'auto',
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stickyHeight: 'auto',
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stickyLeft: 0,
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isFixed: false,
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}
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},
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//监听属性
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watch: {
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value: {
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handler(val, oldVal) {
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this.$emit('change', val)
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this.queryMultipleNodes(val)
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if (this.isScroll) {
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this.pageScrollTo(val)
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}
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this.isScroll = true
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},
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},
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'tabsInfo.PageScrollX': {
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handler(val) {
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if (!this.scrollspy) return
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this.setTimeoutFn && clearTimeout(this.setTimeoutFn)
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this.setTimeoutFn = setTimeout(() => {
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for (let index = 0; index < this.tabs.length; index++) {
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let elementBefore = 0
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let elementAfter = Infinity
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if (index != 0) {
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elementBefore = this.tabs[index].top - this.tabsHeight
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}
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if (index != this.tabs.length - 1) {
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elementAfter = this.tabs[index + 1].top - this.tabsHeight
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}
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if (val + 1 > elementBefore && val + 1 < elementAfter) {
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if (this.tabs[index].name != this.value && this.flag) {
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this.isScroll = false
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this.$emit('input', this.tabs[index].name)
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}
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}
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}
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}, 300)
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},
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},
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},
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computed: {
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headStyle() {
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return `box-sizing: content-box;padding-top:${this.openTitleType ? this.StatusBarRpx : 0}rpx`
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},
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stickyContent() {
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let style = {}
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style.position = this.isFixed ? 'fixed' : 'static'
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if (this.openTitleType) {
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style.position = 'fixed'
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style.paddingTop = this.StatusBarRpx + 'rpx'
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}
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style.top = this.stickyTop + 'px'
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style.left = this.stickyLeft + 'px'
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if (this.stickyWidth != 'auto') {
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style.width = this.stickyWidth + 'px'
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}
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if (this.stickyHeight != 'auto') {
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style.height = this.stickyHeight + 'px'
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}
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style.zIndex = this.isFixed ? this.zIndex : 0
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return style
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},
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stickyTop() {
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if (this.openTitleType) {
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return Math.floor(this.top / this.unitRatio)
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} else {
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return Math.floor((this.top + this.StatusBarRpx) / this.unitRatio)
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}
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},
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},
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methods: {
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toJSON() {},
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// 获取元素
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uGetRect(selector, all) {
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return new Promise((resolve) => {
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// #ifdef H5
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let rect = document[all ? 'querySelectorAll' : 'querySelector'](selector).getBoundingClientRect()
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if (all && Array.isArray(rect) && rect.length) {
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resolve(rect)
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}
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if (!all && rect) {
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resolve(rect)
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}
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// #endif
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// #ifndef H5
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uni
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.createSelectorQuery()
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.in(this)
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[all ? 'selectAll' : 'select'](selector)
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.boundingClientRect((rect) => {
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if (all && Array.isArray(rect) && rect.length) {
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resolve(rect)
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}
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if (!all && rect) {
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resolve(rect)
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}
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})
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.exec()
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// #endif
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})
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},
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initObserveContent() {
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// 获取吸顶内容的高度，用于在js吸顶模式时，给父元素一个填充高度，防止"塌陷"
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this.uGetRect(`#${this.selectMark}-box`).then((res) => {
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this.stickyHeight = res.height
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this.stickyLeft = res.left
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this.stickyWidth = res.width
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this.$nextTick(() => {
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this.observeContent()
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})
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})
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},
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observeContent() {
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// 先断掉之前的观察
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this.disconnectObserver('contentObserver')
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let contentObserver = uni.createIntersectionObserver(this)
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/* #ifndef MP-WEIXIN */
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let pages = getCurrentPages()
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let pageInfo = getCurrentPages()[pages.length - 1]
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contentObserver = uni.createIntersectionObserver(pageInfo)
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/* #endif */
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// 到屏幕顶部的高度时触发
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contentObserver.relativeToViewport({
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top: -this.stickyTop,
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})
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// 绑定观察的元素
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contentObserver.observe(`#${this.selectMark}-box`, (res) => {
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this.setFixed(res)
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})
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this.contentObserver = contentObserver
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},
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setFixed(res) {
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this.isFixed = this.stickyTop > res.boundingClientRect.bottom
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},
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disconnectObserver(observerName) {
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// 断掉观察，释放资源
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const observer = this[observerName]
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observer && observer.disconnect()
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},
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//滚动到指定位置
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queryMultipleNodes(name) {
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let that = this
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let lineWidth = 0
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let boxlet = 0
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let boxWidth = 0
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let maxLeft = 0
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let itemLeft = 0
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let moveX = 0
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this.$nextTick(() => {
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uni
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.createSelectorQuery()
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.select(`#${that.selectMark}`)
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.boundingClientRect()
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.select(`#${that.selectMark}-title-item-${name}`)
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.boundingClientRect()
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.select(`#${that.selectMark}-line`)
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.boundingClientRect()
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.select(`#${that.selectMark}-content`)
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.boundingClientRect()
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.exec(function (rects) {
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that.tabsHeight = Math.floor(rects[0].height + that.StatusBar + that.top / that.unitRatio)
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boxlet = rects[0].left
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boxWidth = rects[0].width
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lineWidth = rects[2].width
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if (rects[1] && rects[1].width && lineWidth > rects[1].width) {
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lineWidth = rects[1].width
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itemLeft = rects[1].left
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}
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maxLeft = rects[3].width - rects[0].width
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maxLeft = maxLeft < 0 ? 0 : maxLeft
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let query = uni.createSelectorQuery().select(`#${that.selectMark}`).scrollOffset()
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query.select(`#${that.selectMark}-title-item-${name}`).boundingClientRect()
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query.exec(function (res) {
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if (!res[1]) return
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itemLeft = that.tabsInfo.scrollX + res[1].left - boxlet + res[1].width / 2
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if (itemLeft >= boxWidth / 2) {
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moveX = itemLeft - boxWidth / 2
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moveX = moveX > maxLeft ? maxLeft : moveX
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} else {
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moveX = 0
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}
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that.$emit('update:tabsInfo', {
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...that.tabsInfo,
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lineleft: itemLeft + 'px',
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lineWidth: lineWidth + 'px',
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moveX: moveX,
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})
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})
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})
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})
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},
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setflag() {
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this.flag = false
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this.flagSetTimeoutFn && clearTimeout(this.flagSetTimeoutFn)
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this.flagSetTimeoutFn = setTimeout(() => {
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this.flag = true
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}, 1000)
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},
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pageScrollTo(name) {
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if (!this.isShowContent) return
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if (!this.scrollspy) return
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var that = this
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var query = uni.createSelectorQuery()
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query.selectViewport().scrollOffset()
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query.select(`#${this.selectMark}-body-item-${name}`).boundingClientRect()
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query.exec(function (res) {
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var miss = res[0].scrollTop - that.tabsHeight
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if (res[1]?.top) miss += res[1]?.top
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that.setflag()
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uni.pageScrollTo({
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scrollTop: miss,
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duration: 300,
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})
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})
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},
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// 获取主体高度
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getBodyHeight() {
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if (!this.isShowContent) return
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if (!this.scrollspy) return
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let that = this
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uni
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.createSelectorQuery()
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.selectAll(`.${this.selectMark}-body-item`)
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.boundingClientRect()
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.exec(function (res) {
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let tabs = []
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res[0].map((item, index) => {
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let name = item.id.replace(`${that.selectMark}-body-item-`, '')
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if (index == 0) {
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tabs.push({
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name,
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top: 0,
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})
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} else {
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tabs.push({
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name,
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top: item.top,
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})
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}
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})
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that.tabs = tabs
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})
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},
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},
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created() {},
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mounted() {
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this.$emit('update:tabs-info', {
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...this.tabsInfo,
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lineleft: '0px',
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moveX: 0,
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})
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this.$nextTick(() => {
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this.queryMultipleNodes(this.value)
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this.getBodyHeight()
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})
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},
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updated() {
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if (this.openSticky || this.openTitleType) {
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this.initObserveContent()
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}
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},
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beforeDestroy() {
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this.disconnectObserver('contentObserver')
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},
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}
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</script>
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<style lang="scss" scoped></style>
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