app/pages/tabbar/vlog/index.nvue

<template>
	<view class="page" :id="pageId">
		<!-- <list :id="pageId" class="page" :bounce="true" isSwiperList="true"> -->
		<!-- 左中右的三个页面切换, 依次是: 附近 - 关注 - 推荐 -->
		<swiper ref="swiper1" id="tab-bar-view" style="my-swiper" :style="{height: screenHeight + 'px'}"
			:current="curIndex" @change="changeTopTab" @transition="onswiperscroll" @animationfinish="animationfinish"
			@onAnimationEnd="animationfinish">
			<!-- 		<swiper-item>
				<view class="near-by" :style="{height: screenHeight+'px'}">
					<text ref="fujin" :pid="0" :parentId="pageId" class="warn-info">暂未开放，敬请期待!</text>
				</view>
			</swiper-item> -->
			<swiper-item>
				<view v-if="myUserInfo == null" ref="videoFollowComp" class="my-follow" :style="{height: screenHeight+'px'}">
					<text class="warn-info">请登录后查看！</text>
				</view>
				<video-follow-comp ref="videoFollowComp" :pid="1" :parentId="pageId" :screenHeight="screenHeight"
					:playFollowStatus="playFollowStatus" :videoList="videoList" :refreshList="refreshList"
					:pagingList="pagingList" @showLoading="showLoading" @hideLoading="hideLoading"
					@letFollowVideoPause="letFollowVideoPause"
					@displayVideoPaging="displayVideoPaging"></video-follow-comp>
			</swiper-item>
			<swiper-item>
				<video-comp ref="videoComp" :pid="2" :parentId="pageId" :screenHeight="screenHeight"
					:playStatus="playStatus" :videoList="videoList" :refreshList="refreshList" :pagingList="pagingList"
					@showLoading="showLoading" @hideLoading="hideLoading"
					@displayVideoPaging="displayVideoPaging"></video-comp>
			</swiper-item>
		</swiper>

		<view class="header" id="head" :style="{marginTop:statusBarHeight+'px'}" v-if="!isLoading">
			<text class="header-left"></text>
			<view class="header-center">
				<!-- <view class="header-item" @click="tapFollow(0)">
					<text class="header-item-title">附近</text>
					<view class="header-item-line" :class="{'activate-line': curIndex === 0}"></view>
				</view>
				<view class="header-item" @click="tapFollow(1)">
					<text class="header-item-title">关注</text>
					<view class="header-item-line" :class="{'activate-line': curIndex === 1}"></view>
				</view>
				<view class="header-item" @click="tapFollow(2)">
					<text class="header-item-title">推荐</text>
					<view class="header-item-line" :class="{'activate-line': curIndex === 2}"></view>
				</view> -->

				<scroll-view ref="tabbar1" id="tab-bar" class="tab-bar" :scroll="false" :scroll-x="true"
					:show-scrollbar="false" :scroll-into-view="scrollInto">
					<view style="flex-direction: column;flex: 1;">
						<view style="flex-direction: row;flex: 1;justify-content: space-around;">
							<view class="uni-tab-item" v-for="(tab,index) in tabList" :key="tab.id" :id="tab.id"
								:ref="'tabitem'+index" :data-id="index" :data-current="index" @click="ontabtap">
								<text class="uni-tab-item-title scroll-view-animation"
									:class="tabIndex==index ? 'uni-tab-item-title-active' : ''">{{tab.name}}</text>
							</view>
						</view>
						<view class="scroll-view-indicator">
							<view ref="underline" class="scroll-view-underline" :class="'scroll-view-animation'"
								:style="{left: indicatorLineLeft + 'px', width: indicatorLineWidth + 'px'}"></view>
						</view>
					</view>
				</scroll-view>
				<!-- <view class="tab-bar-line">tab-bar-line</view> -->

			</view>
			<image class="header-right-search normal-img" src="/static/images/icon-search.png" @click="goSearch">
		</view>

		<view class="header" :style="{marginTop:statusBarHeight+'px'}" v-if="isLoading">
			<text class="header-left"></text>
			<view class="header-center">
				<view class="header-item">
					<text class="header-refresh-title">下拉刷新视频</text>
				</view>
			</view>
			<image class="header-right-search normal-img" src="/static/images/loading.gif">
		</view>
		<!-- 顶部切换的导航 end -->

	</view>
	<!-- </list> -->
</template>
<script>
	let animation = weex.requireModule('animation')
	let dom = weex.requireModule('dom');
	let system = uni.getSystemInfoSync();
	// 缓存每页最多
	const MAX_CACHE_DATA = 100;
	// 缓存页签数量
	const MAX_CACHE_PAGE = 3;
	const TAB_PRELOAD_OFFSET = 1;
	import storage from "@/utils/storage.js"; //缓存
	import {
		vlogList
	} from "@/api/vlog"
	import {
		isStrEmpty
	} from '@/utils/tools.js'
	import videoComp from '@/components/vlog/videoComp';
	import videoFollowComp from '@/components/vlog/videoFollowComp';
	export default {
		components: {
			videoComp,
			videoFollowComp
		},
		data() {
			return {
				isLoading: false,
				statusBarHeight: system.statusBarHeight,
				screenHeight: system.screenHeight,
				curIndex: 1,
				playStatus: false,
				playFollowStatus: false,
				videoList: [], // 首页一开始查询所得的默认视频列表
				refreshList: [], // 下拉刷新后获得的新的列表
				pagingList: [], // 分页list
				refresh: 0, // 从me页面传来的refresh，用于退出登录后重新刷新当前页的视频
				/////////////////
				pageList: ['videoFollowComp', 'videoComp'],
				tabList: [
					{
						id: "tab" + 0,
						name: '关注',
						pageid: 1
					},
					{
						id: "tab" + 1,
						name: '推荐',
						pageid: 2
					}
				], //tabs内容,'fujin','videoFollowComp','videoComp'
				indicatorLineLeft: 0,
				indicatorLineWidth: 0,
				cacheTab: [],
				scrollInto: "",
				pageId: "page",
				tabIndex: 1,
			}
		},
		onReady() {
			this._lastTabIndex = 0;
			this.swiperWidth = 0;
			this.tabbarWidth = 0;
			this.tabListSize = {};
			this._touchTabIndex = 0;
			this._headHeight = 100;
			var timer = setTimeout(()=>{
				this.selectorQuery();
				clearTimeout(timer)
			},300);
			
		},
		onTabItemTap: function(e) {
			console.log(e)
			// let tabIndex = e.index;
			// this.playStatus = tabIndex === 0 ? true : false;
			// 切换视频要做暂停或播放的判断
			// let me = this;
			//  if (tabIndex == 0) {
			// 	me.playStatus = false;
			// 	me.playFollowStatus = true;
			// } else if (tabIndex == 2) {
			// 	me.playStatus = true;
			// 	me.playFollowStatus = false;
			// }
		},
		onShow() {
			let me = this;
			if(uni.getStorageSync('refreshVlogIndex')=='1'){
				storage.setRefreshVlogIndex('0') //不需要刷新
				this.$refs.videoComp.displayVideoPaging(1, true);
			}

			// 如果当前没有list, 则relaunch
			if (this.$refs.videoComp != undefined) {
				let playerList = this.$refs.videoComp.playerList;
				if (playerList != undefined && playerList.length == 0) {
					this.$refs.videoComp.displayVideoPaging(1, true);
				}
			}


			// 判断如果当前是tab为1或2，则播放，否则不播放
			if (me.curIndex == 0) {
				me.playFollowStatus = true;
			} else if (me.curIndex == 1) {
				me.playStatus = true;
			}

			// onShow的时候，关注的话，则重新刷一下list
			var justFollowVlogerId = uni.getStorageSync("justFollowVlogerId") || '';
			console.log('我是justFollowVlogerId', justFollowVlogerId)
			if (!isStrEmpty(justFollowVlogerId)) {
				this.$refs.videoComp.reFollowPlayList(justFollowVlogerId);
				uni.setStorageSync("justFollowVlogerId", "");
			}
			// 取消关注也要重新刷一下list
			var justCancelVlogerId = uni.getStorageSync("justCancelVlogerId");
			if (!isStrEmpty(justCancelVlogerId)) {
				this.$refs.videoComp.reCancelPlayList(justCancelVlogerId);
				uni.setStorageSync("justCancelVlogerId", "");
			}
		},
		onHide() {
			var me = this;
			// 显示和隐藏，需要判断根据不同tab做暂停或者隐藏
			if (me.curIndex == 0) {
				me.playFollowStatus = false;
			} else if (me.curIndex == 1) {
				me.playStatus = false;
			}
		},

		// 当前页下拉刷新
		// onPullDownRefresh() {
		// 	var me = this;
		// 	// 下拉刷新判断，如果是不同tab，那么组件中刷新的请求也不同
		// 	if (me.curIndex == 0) {
		// 		this.$refs.videoFollowComp.displayVideoPaging(1, true);
		// 	} else if (me.curIndex == 1) {
		// 		this.$refs.videoComp.displayVideoPaging(1, true);
		// 	}

		// },
		methods: {
			// 前往搜索页面
			goSearch() {
				uni.navigateTo({
					url: "/pages/search/search"
				})
			},
			// ----------头部区域点击tabs
			ontabtap(e) {
				let index = e.target.dataset.current || e.currentTarget.dataset.current;
				this.tapFollow(index)
				this.switchTab(index);
			},
			//
			selectorQuery() {
				uni.createSelectorQuery().in(this).select('#head').boundingClientRect().exec(rect => {
					this._headHeight = rect[0].height;
				});

				// 查询 tabbar 宽度
				uni.createSelectorQuery().in(this).select('#tab-bar').boundingClientRect().exec(rect => {
					this.tabbarWidth = rect[0].width;
					console.log(this.tabbarWidth)
				});
				// 查询 tabview 宽度
				uni.createSelectorQuery().in(this).select('#tab-bar-view').boundingClientRect().exec(rect => {
					this.swiperWidth = rect[0].width;
					console.log(this.swiperWidth)
				});

				// 因 nvue 暂不支持 class 查询
				var queryTabSize = uni.createSelectorQuery().in(this);
				for (var i = 0; i < this.tabList.length; i++) {
					queryTabSize.select('#' + this.tabList[i].id).boundingClientRect();
				}
				queryTabSize.exec(rects => {
					rects.forEach((rect) => {
						rect.left = rect.left - 40; //修正 left 值，减去 padding-left: 40px
						this.tabListSize[rect.dataset.id] = rect;
					})
					console.log(this.tabListSize[this.tabIndex])
					this.updateIndicator(this.tabListSize[this.tabIndex].left, this.tabListSize[this.tabIndex]
						.width);
					this.switchTab(this.tabIndex);
				});
			},

			onswiperscroll(e) {
				// if(!this.tabListSize[this._lastTabIndex]) return
				var offsetX = e.detail.dx; 
				var preloadIndex = this._lastTabIndex;
				if (offsetX > TAB_PRELOAD_OFFSET) {
					preloadIndex++;
				} else if (offsetX < -TAB_PRELOAD_OFFSET) {
					preloadIndex--;
				}
				if (preloadIndex === this._lastTabIndex || preloadIndex < 0 || preloadIndex > this.pageList.length - 1) {
					return;
				}
				let prop = this.pageList[preloadIndex]
				let obj = this.$refs[prop]
				if (obj.playerList.length === 0) {
					// this.loadTabData(preloadIndex);
				}
				// console.log(this.tabListSize)  
				var percentage = Math.abs(this.swiperWidth / offsetX);
				var currentSize = this.tabListSize[this._lastTabIndex];
				var preloadSize = this.tabListSize[preloadIndex];
				var lineL = currentSize.left + (preloadSize.left - currentSize.left) / percentage;
				var lineW = currentSize.width + (preloadSize.width - currentSize.width) / percentage;
				this.updateIndicator(lineL, lineW);
			},
			animationfinish(e) {
				let index = e.detail.current; 
				this._lastTabIndex = index;
				this.switchTab(index);
				if(!this.tabListSize[index]) {
					return 
				}else{
					this.updateIndicator(this.tabListSize[index].left, this.tabListSize[index].width); 
				}
				
			},
			updateIndicator(left, width) {
				this.indicatorLineLeft = left;
				this.indicatorLineWidth = width;
			},

			switchTab(index) {

				// console.dir(this.$refs)
				let props = this.pageList[index]
				console.log(props)
				console.log(index)
				let obj = this.$refs[props]
				// if (obj.playerList.length === 0) {
				// 	var info = storage.getVlogUserInfo() || null
				// 	if(info!=null&&index==0){
				// 		obj.displayVideoPaging(this.page + 1, true);
				// 	}
				// }


				obj.setScrollRef(this._headHeight);

				if (this.tabIndex === index) {
					return;
				}

				console.log(this.cacheTab)
				// 缓存 tabId
				if (obj.playerList.length > MAX_CACHE_DATA) {
					let isExist = this.cacheTab.indexOf(this.tabIndex);
					if (isExist < 0) {
						this.cacheTab.push(this.tabIndex);
					}
				}
				this.tabIndex = index;
				this.curIndex = index;
				this.scrollTabTo(index);
				this.scrollInto = this.tabList[index].id;

				// 释放 tabId
				if (this.cacheTab.length > MAX_CACHE_PAGE) {
					let cacheIndex = this.cacheTab[0];
					this.clearTabData(cacheIndex);
					this.cacheTab.splice(0, 1);
				}
				// const el = this.$refs['tabitem' + index][0];
				// animation.transition(el, {
				// 	duration: 3000, //ms
				// 	timingFunction: 'ease',
				// 	delay: 1000 //ms
				// });
			},
			scrollTabTo(index) {
				const el = this.$refs['tabitem' + index][0];
				let offset = 0;
				// TODO fix ios offset
				if (index > 0) {
					offset = this.tabbarWidth / 2 - this.tabListSize[index].width / 2;
					if (this.tabListSize[index].right < this.tabbarWidth / 2) {
						offset = this.tabListSize[0].width;
					}
				}
				dom.scrollToElement(el, {
					offset: -offset
				});
			},

			//----------------------------

			// 左滑右滑选项卡改变选中状态
			changeTopTab: function(e) {
				var current = e.detail.current;
				this.switchTab(current)
				this.curIndex = current;
				this.tabIndex = current
				this.playFollowStatus = this.curIndex === 0 ? true : false;
				this.playStatus = this.curIndex === 1 ? true : false;
			},
			// 点击头部选项卡，切换页面
			tapFollow: function(current) {
				this.curIndex = current;
				this.tabIndex = current
				this.playFollowStatus = this.curIndex === 0 ? true : false;
				this.playStatus = this.curIndex === 1 ? true : false;
			},

			// 下拉刷新，改变head的字样显示
			showLoading() {
				this.isLoading = true;
			},
			hideLoading() {
				this.isLoading = false;
			},
			letFollowVideoPause() {
				this.playFollowStatus = false;
			}
		}
	}
</script>

<style scoped>
	/* index start */
	.page {
		position: absolute;
		left: 0;
		right: 0;
		top: 0;
		bottom: 0;
		background-color: #000000;
	}

	/* index end */

	/* 顶部选项卡 start */
	.header {
		position: absolute;
		left: 0;
		right: 0;
		flex-direction: row;
		height: 100rpx;
		line-height: 100rpx;
		align-items: center;
		padding-left: 40px;
		padding-right: 40px;
	}

	.header-center {
		flex: 1;
		flex-direction: row;
		align-items: center;
		justify-content: center;
	}

	.header-left,
	.header-right {
		color: #999;
		height: 100rpx;
		line-height: 100rpx;
		align-items: flex-start;
		justify-content: flex-end;
		font-family: iconfont;
	}

	.header-right-search {
		height: 100rpx;
		/* align-items: flex-start;
		justify-content: flex-end; */
	}

	.header-item {
		align-items: center;
		margin-left: 6rpx;
		margin-right: 6rpx;
	}

	.header-item-title {
		width: 120rpx;
		text-align: center;
		height: 60rpx;
		line-height: 60rpx;
		color: #FFFFFF;
		font-size: 16px;
		font-weight: 600;
	}

	.header-refresh-title {
		width: 300rpx;
		text-align: center;
		height: 60rpx;
		line-height: 60rpx;
		color: #FFFFFF;
		font-size: 16px;
		font-weight: 600;
	}

	.header-item-line {
		height: 5rpx;
		line-height: 8rpx;
		width: 60rpx;
		border-radius: 8rpx;
	}

	/* 顶部选项卡 end */

	/* 选项卡轮播组件 start */
	.my-swiper {
		position: absolute;
		left: 0;
		right: 0;
		top: 0;
		bottom: 0;
	}

	.near-by {
		background-color: #000000;
		align-items: center;
		justify-content: center;
	}

	.my-follow {
		background-color: #000000;
		align-items: center;
		justify-content: center;
	}

	/* 选项卡轮播组件 end */
	.warn-info {
		color: #FFFFFF;
		font-size: 36rpx;
		font-weight: 600;
	}

	.normal-img {
		width: 50rpx;
		height: 50rpx;
		opacity: 0.8;
	}

	/*  */
	.tab-bar {
		/* width: 750upx; */
		flex: 1;
		height: 84upx;
		flex-direction: row;
		lines: 1;
		text-overflow: ellipsis;
		justify-content: center;
		align-items: center;
	}

	.uni-tab-item {
		flex-wrap: nowrap;
		/* padding-left: 25px; */
		/* padding-right: 25px; */
	}

	.uni-tab-item-title {
		color: #999;
		font-size: 30upx;
		height: 80upx;
		line-height: 80upx;
		flex-wrap: nowrap;
	    lines: 1;
	    text-overflow: ellipsis;
	}

	.uni-tab-item-title-active {
		color: #FFFFFF;
	}

	.scroll-view-indicator {
		position: relative;
		height: 2px;
		background-color: transparent;
	}

	.scroll-view-underline {
		position: absolute;
		top: 0;
		bottom: 0;
		width: 0;
		/* background-color: #007AFF; */
		background-color: #FFFFFF;
	}

	.scroll-view-animation {
		transition-duration: 0.2s;
		/* transition-property: transform; */
	}

	.tab-bar-line {
		height: 1upx;
		background-color: #cccccc;
	}
</style>