/**
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* CInfiniteScroll
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* @author Tevin
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*/
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<template>
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<scroll-view
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:id="elmId"
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class="c-infinite-scroll"
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:scrollY="true"
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lowerThreshold="100"
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@scroll="evt=>onScroll(evt)"
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@touchstart="evt=>onTouch(evt)"
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@touchmove="evt=>onTouch(evt)"
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@touchend="evt=>onTouch(evt)"
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@scrollToLower="evt=>onScrollToLower(evt)"
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>
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<view
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class="c-infinite-top"
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:class="touching?'touching':''"
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:style="{height: touch.driftTop+'rem'}"
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>
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<view class="inner">
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<view v-if="touch.dargState===2">
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<AtActivityIndicator />
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<text class="text">重新加载中...</text>
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</view>
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<view
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class="tips"
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v-else
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:class="touch.dargState===0?'':'release'"
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>
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<view class="at-icon at-icon-arrow-down"></view>
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<text class="text">下拉刷新</text>
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<text class="text">释放刷新</text>
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</view>
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</view>
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</view>
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<view class="c-infinite-content">
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<slot />
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</view>
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<view class="c-infinite-bottom">
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<view
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class="c-infinite-loading"
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v-if="!ending"
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>
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<text v-show="loading">加载中，请稍后...</text>
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</view>
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<view v-if="ending">
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<text
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class="c-infinite-ended"
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v-if="pageTotal > 0"
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>-- 没有更多了 --</text>
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<text
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class="c-infinite-empty"
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v-else
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>(暂无数据)</text>
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</view>
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</view>
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</scroll-view>
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</template>
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<script>
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import Taro from '@tarojs/taro';
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import { AtActivityIndicator } from 'taro-ui-vue';
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import { Tools } from '@components/common/Tools';
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import './cInfiniteScroll.scss';
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export default {
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name: 'CInfiniteScroll',
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components: {
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AtActivityIndicator,
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},
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props: {
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// 是否自动初始化（自动加载第一页）
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autoInit: {
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type: Boolean,
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default: false,
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},
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// 发起加载页面数据回调
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// 参数 {
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// current: 当前页页码,
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// next: 需要加载的页面页码,
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// success: 当加载成功后页面调用, 回传参数 { pageTotal: 当前翻页总页数 }
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// fail: 加载失败后页面调用
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// }
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onLoadMore: Function,
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},
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data() {
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return {
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elmId: 'cis-' + Tools.createGUID(),
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// 初始化状态
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inital: false,
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// 当前页面
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current: 0,
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// 总共页面
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pageTotal: 1,
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// 加载中状态
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loading: false,
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// 是否结束状态
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ending: false,
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// 上次滚动位置
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lastScrollTop: 0,
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// 滚动节流器
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scrollTimer: 0,
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// 是否已滚动
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scrolled: false,
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// 滑屏数据
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touch: {
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startX: 0,
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startY: 0,
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lastY: 0,
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dargState: 0,
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driftTop: 0,
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},
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// 正在滑屏状态
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touching: false,
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};
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},
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methods: {
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hanldeLoadMore() {
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// 结束后跳过
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if (this.ending) {
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return;
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}
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// 加载中跳过
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if (this.loading) {
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return;
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}
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// 开始加载
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this.inital = true;
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this.loading = true;
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setTimeout(() => {
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this.onLoadMore({
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current: this.current,
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next: this.current + 1,
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// 加载成功
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success: options => {
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this.$nextTick(() => {
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this.loading = false;
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// 没有数据
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if (!options.pageTotal || options.pageTotal <= 0) {
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this.ending = true;
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this.pageTotal = 0;
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}
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// 有数据
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else {
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this.pageTotal = options.pageTotal;
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this.current = this.current + 1;
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// 已到最后一页
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if (this.current >= this.pageTotal) {
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this.ending = true;
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}
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}
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// 如果下拉刷新，还原下拉
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if (this.touch.dargState === 2) {
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this.touch.driftTop = 0;
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setTimeout(() => {
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this.touch.dargState = 0;
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}, 300);
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}
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});
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},
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// 加载失败
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fail: () => {
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this.loading = false;
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this.ending = true;
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this.pageTotal = 0;
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// 如果下拉刷新，还原下拉
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if (this.touch.dargState === 2) {
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this.touch.driftTop = 0;
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setTimeout(() => {
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this.touch.dargState = 0;
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}, 300);
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}
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},
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});
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}, 100);
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},
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onScroll(evt) {
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// 已经滚动（滚动后禁止下拉刷新）
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this.scrolled = true;
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// 往上
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if (this.lastScrollTop >= evt.detail.scrollTop) {
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this.lastScrollTop = evt.detail.scrollTop;
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return;
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}
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// 往下
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else {
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if (process.env.TARO_ENV !== 'h5') {
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return;
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}
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const viewHeight = evt.target.offsetHeight;
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const { scrollTop, scrollHeight } = evt.detail;
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// 阀值 100 像素，向下滚动到最后 100 像素，识别为启动加载
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if (viewHeight + scrollTop >= scrollHeight - 100) {
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clearTimeout(this.scrollTimer);
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this.scrollTimer = setTimeout(() => {
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this.hanldeLoadMore();
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}, 200);
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}
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}
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},
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// 小程序中滚动到底部
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onScrollToLower() {
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if (process.env.TARO_ENV !== 'weapp') {
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return;
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}
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this.hanldeLoadMore();
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},
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// 手指拨动
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onTouch(evt) {
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// 拉动长度（少于这个值的时候下拉但是不刷新）
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const deviationY = 50;
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// 拉动的最大高度
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const maxTransY = 100;
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// 按下
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if (evt.type === 'touchstart') {
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this.touching = true;
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// 手指按下，重置是否已滚动
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this.scrolled = false;
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if (evt.touches.length !== 1) {
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return;
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}
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this.touch.startX = evt.touches[0].clientX;
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this.touch.startY = evt.touches[0].clientY;
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this.touch.lastY = evt.touches[0].clientY;
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}
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// 滑动
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else if (evt.type === 'touchmove') {
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// 已滚动跳过
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if (this.scrolled) {
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return;
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}
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// 加载中跳过
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if (this.loading) {
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return;
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}
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this.touching = true;
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// 左右偏移判断（向下拉时，如果左右偏移超过阀值不执行下拉操作）
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const ratio =
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Math.abs(evt.touches[0].clientX - this.touch.startX) /
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Math.abs(evt.touches[0].clientY - this.touch.startY);
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const dragDown = this.touch.lastY - evt.touches[0].clientY < 0;
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this.touch.lastY = evt.touches[0].clientY;
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if (dragDown && ratio > 0.3) {
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return;
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}
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// 拖动距离
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const deltY = evt.touches[0].clientY - this.touch.startY;
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// 拖动值=拖动距离/拖动倍率，使拖动的时候有粘滞的感觉
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const transY = Math.min(Math.abs(deltY) / 4, maxTransY);
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if (deltY > 0) {
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this.touch.driftTop = (transY / maxTransY) * 5;
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// 超过阀值，可以刷新
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if (transY >= deviationY) {
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this.touch.dargState = 1;
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}
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// 小于阀值，不能刷新
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else {
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this.touch.dargState = 0;
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}
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} else {
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this.touch.driftTop = 0;
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}
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}
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// 松开
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else if (evt.type === 'touchend') {
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this.touching = false;
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// 已滚动跳过
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if (this.scrolled) {
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this.touch.driftTop = 0;
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return;
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}
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// 加载中跳过
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if (this.loading) {
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this.touch.driftTop = 0;
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return;
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}
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// 不刷新
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if (this.touch.dargState === 0) {
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this.touch.driftTop = 0;
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return;
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}
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// 刷新数据
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if (this.touch.dargState === 1) {
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this.touch.driftTop = (deviationY / maxTransY) * 5;
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// 重新加载
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this.touch.dargState = 2;
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this.ending = false;
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this.current = 0;
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this.hanldeLoadMore();
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}
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}
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},
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// 初始加载
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$initScroll() {
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// 已初始化，跳过
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if (this.inital) {
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return;
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}
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this.hanldeLoadMore();
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},
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// 刷新加载
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$refresh(autoStart) {
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Taro.pageScrollTo({
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selector: '#' + this.elmId,
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scrollTop: 0,
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});
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this.ending = false;
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this.current = 0;
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if (autoStart === 'off') {
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this.inital = false;
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} else {
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this.hanldeLoadMore();
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}
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},
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},
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mounted() {
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// 开启自动初始化
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if (this.autoInit) {
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this.hanldeLoadMore();
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}
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},
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};
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</script>
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