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364 lines
12 KiB
364 lines
12 KiB
4 years ago
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<template>
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<view class="tabs">
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<scroll-view ref="tabbar1" id="tab-bar" class="tab-bar" :scroll="false" :scroll-x="true" :show-scrollbar="false"
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:scroll-into-view="scrollInto">
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<view style="flex-direction: column;">
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<view style="flex-direction: row;">
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<view class="uni-tab-item" v-for="(tab,index) in tabList" :key="tab.id" :id="tab.id" :ref="'tabitem'+index"
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:data-id="index" :data-current="index" @click="ontabtap">
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<text class="uni-tab-item-title" :class="tabIndex==index ? 'uni-tab-item-title-active' : ''">{{tab.name}}</text>
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</view>
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</view>
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<view class="scroll-view-indicator">
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<view ref="underline" class="scroll-view-underline" :class="isTap ? 'scroll-view-animation':''"
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:style="{left: indicatorLineLeft + 'px', width: indicatorLineWidth + 'px'}"></view>
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</view>
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</view>
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</scroll-view>
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<view class="tab-bar-line"></view>
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<swiper class="tab-view" ref="swiper1" id="tab-bar-view" :current="tabIndex" :duration="300" @change="onswiperchange"
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@transition="onswiperscroll" @animationfinish="animationfinish" @onAnimationEnd="animationfinish">
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<swiper-item class="swiper-item" v-for="(page, index) in tabList" :key="index">
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<!-- #ifndef MP-ALIPAY -->
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<swiperPage class="swiper-page" :pid="page.pageid" ref="page"></swiperPage>
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<!-- #endif -->
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<!-- #ifdef MP-ALIPAY -->
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<swiperPage class="swiper-page" :pid="page.pageid" :ref="'page' + index"></swiperPage>
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<!-- #endif -->
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</swiper-item>
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</swiper>
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</view>
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</template>
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<script>
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// #ifdef APP-NVUE
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const dom = weex.requireModule('dom');
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// #endif
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// 缓存每页最多
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const MAX_CACHE_DATA = 100;
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// 缓存页签数量
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const MAX_CACHE_PAGE = 3;
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const TAB_PRELOAD_OFFSET = 1;
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import swiperPage from './swiper-page.nvue';
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export default {
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components: {
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swiperPage
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},
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data() {
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return {
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tabList: [],
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tabIndex: 0,
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cacheTab: [],
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scrollInto: "",
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indicatorLineLeft: 0,
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indicatorLineWidth: 0,
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isTap: false
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}
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},
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onLoad() {
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for (var i = 0; i < 6; i++) {
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this.tabList.push({
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id: "tab" + i,
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name: 'Tab ' + (i + 1),
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pageid: i + 1
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})
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}
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},
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onReady() {
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this._lastTabIndex = 0;
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this.swiperWidth = 0;
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this.tabbarWidth = 0;
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this.tabListSize = {};
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this._touchTabIndex = 0;
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// #ifndef MP-ALIPAY
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this.pageList = this.$refs.page;
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// #endif
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// #ifdef MP-ALIPAY
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this.pageList = [];
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for (var i = 0; i < this.tabList.length; i++) {
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this.pageList.push(this.$refs['page' + i][0]);
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}
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// #endif
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this.switchTab(this.tabIndex);
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this.getTabbarItemsSize();
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},
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methods: {
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ontabtap(e) {
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let index = e.target.dataset.current || e.currentTarget.dataset.current;
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// #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-QQ
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this.isTap = true;
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var currentSize = this.tabListSize[index];
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this.updateIndicator(currentSize.left, currentSize.width);
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this._touchTabIndex = index;
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// #endif
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this.switchTab(index);
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},
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onswiperchange(e) {
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// 注意：百度小程序会触发2次
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// #ifndef APP-PLUS || H5 || MP-WEIXIN || MP-QQ
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let index = e.target.current || e.detail.current;
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this.switchTab(index);
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// #endif
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},
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onswiperscroll(e) {
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if (this.isTap) {
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return;
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}
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var offsetX = e.detail.dx;
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var preloadIndex = this._lastTabIndex;
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if (offsetX > TAB_PRELOAD_OFFSET) {
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preloadIndex++;
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} else if (offsetX < -TAB_PRELOAD_OFFSET) {
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preloadIndex--;
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}
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if (preloadIndex === this._lastTabIndex || preloadIndex < 0 || preloadIndex > this.pageList.length - 1) {
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return;
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}
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if (this.pageList[preloadIndex].dataList.length === 0) {
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this.loadTabData(preloadIndex);
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}
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/// 计算 tabbar 底线
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// #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-QQ
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var percentage = Math.abs(this.swiperWidth / offsetX);
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var currentSize = this.tabListSize[this._lastTabIndex];
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var preloadSize = this.tabListSize[preloadIndex];
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var lineL = currentSize.left + (preloadSize.left - currentSize.left) / percentage;
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var lineW = currentSize.width + (preloadSize.width - currentSize.width) / percentage;
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this.updateIndicator(lineL, lineW);
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// #endif
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},
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animationfinish(e) {
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// #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-QQ
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let index = e.detail.current;
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if (this._touchTabIndex === index) {
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this.isTap = false;
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}
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this._lastTabIndex = index;
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this.switchTab(index);
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this.updateIndicator(this.tabListSize[index].left, this.tabListSize[index].width);
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// #endif
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},
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getTabbarItemsSize() {
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// #ifdef APP-NVUE
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// 查询 tabbar 宽度
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uni.createSelectorQuery().in(this).select('#tab-bar').boundingClientRect().exec(rect => {
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this.tabbarWidth = rect[0].width;
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});
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// 查询 tabview 宽度
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uni.createSelectorQuery().in(this).select('#tab-bar-view').boundingClientRect().exec(rect => {
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this.swiperWidth = rect[0].width;
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});
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// 因 nvue 暂不支持 class 查询
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var queryTabSize = uni.createSelectorQuery().in(this);
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for (var i = 0; i < this.tabList.length; i++) {
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queryTabSize.select('#' + this.tabList[i].id).boundingClientRect();
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}
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queryTabSize.exec(rects => {
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console.log(JSON.stringify(rects));
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rects.forEach((rect) => {
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this.tabListSize[rect.dataset.id] = rect;
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})
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});
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// #endif
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// #ifdef MP-WEIXIN || H5 || MP-QQ
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uni.createSelectorQuery().in(this).select('.tab-view').fields({
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dataset: true,
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size: true,
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}, (res) => {
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this.swiperWidth = res.width;
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}).exec();
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uni.createSelectorQuery().in(this).selectAll('.uni-tab-item').boundingClientRect((rects) => {
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rects.forEach((rect) => {
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this.tabListSize[rect.dataset.id] = rect;
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})
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}).exec();
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// #endif
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// #ifdef APP-NVUE || H5 || MP-WEIXIN || MP-QQ
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setTimeout(() => {
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this.updateIndicator(this.tabListSize[this.tabIndex].left, this.tabListSize[this.tabIndex].width);
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}, 100)
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// #endif
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},
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updateIndicator(left, width) {
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this.indicatorLineLeft = left;
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this.indicatorLineWidth = width;
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},
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switchTab(index) {
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if (this.pageList[index].dataList.length === 0) {
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this.loadTabData(index);
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}
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if (this.tabIndex === index) {
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return;
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}
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// 缓存 tabId
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if (this.pageList[this.tabIndex].dataList.length > MAX_CACHE_DATA) {
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let isExist = this.cacheTab.indexOf(this.tabIndex);
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if (isExist < 0) {
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this.cacheTab.push(this.tabIndex);
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}
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}
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this.tabIndex = index;
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// #ifdef APP-NVUE
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this.scrollTabTo(index);
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// #endif
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// #ifndef APP-NVUE
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this.scrollInto = this.tabList[index].id;
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// #endif
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// 释放 tabId
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if (this.cacheTab.length > MAX_CACHE_PAGE) {
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let cacheIndex = this.cacheTab[0];
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this.clearTabData(cacheIndex);
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this.cacheTab.splice(0, 1);
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}
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},
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scrollTabTo(index) {
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const el = this.$refs['tabitem' + index][0];
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let offset = 0;
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// TODO fix ios offset
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if (index > 0) {
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offset = this.tabbarWidth / 2 - this.tabListSize[index].width / 2;
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if (this.tabListSize[index].right < this.tabbarWidth / 2) {
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offset = this.tabListSize[0].width;
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}
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}
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dom.scrollToElement(el, {
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offset: -offset
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});
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},
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loadTabData(index) {
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this.pageList[index].loadData();
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},
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clearTabData(index) {
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this.pageList[index].clear();
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}
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}
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}
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</script>
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<style>
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/* #ifndef APP-PLUS */
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page {
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width: 100%;
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min-height: 100%;
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display: flex;
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}
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/* #endif */
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.tabs {
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flex: 1;
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flex-direction: column;
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overflow: hidden;
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background-color: #ffffff;
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/* #ifdef MP-ALIPAY || MP-BAIDU */
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height: 100vh;
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/* #endif */
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}
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.tab-bar {
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width: 750rpx;
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height: 84rpx;
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flex-direction: row;
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/* #ifndef APP-PLUS */
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white-space: nowrap;
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/* #endif */
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}
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/* #ifndef APP-NVUE */
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.tab-bar ::-webkit-scrollbar {
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display: none;
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width: 0 !important;
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height: 0 !important;
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-webkit-appearance: none;
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background: transparent;
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}
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/* #endif */
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.scroll-view-indicator {
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position: relative;
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height: 2px;
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background-color: transparent;
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}
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.scroll-view-underline {
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position: absolute;
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top: 0;
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bottom: 0;
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width: 0;
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background-color: #007AFF;
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}
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.scroll-view-animation {
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transition-duration: 0.2s;
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transition-property: left;
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}
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.tab-bar-line {
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height: 1rpx;
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background-color: #cccccc;
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}
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.tab-view {
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flex: 1;
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}
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.uni-tab-item {
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/* #ifndef APP-PLUS */
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display: inline-block;
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/* #endif */
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flex-wrap: nowrap;
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padding-left: 25px;
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padding-right: 25px;
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}
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.uni-tab-item-title {
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color: #555;
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font-size: 30rpx;
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height: 80rpx;
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line-height: 80rpx;
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flex-wrap: nowrap;
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/* #ifndef APP-PLUS */
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white-space: nowrap;
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/* #endif */
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}
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.uni-tab-item-title-active {
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color: #007AFF;
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}
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.swiper-item {
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flex: 1;
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flex-direction: column;
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}
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.swiper-page {
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flex: 1;
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flex-direction: row;
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position: absolute;
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left: 0;
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top: 0;
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right: 0;
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bottom: 0;
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}
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</style>
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