69 lines
1.9 KiB
JavaScript
69 lines
1.9 KiB
JavaScript
import { ref } from 'vue';
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// 小程序无法在hook中使用页面级别生命周期,需单独传入: https://ask.dcloud.net.cn/question/161173
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// import { onPageScroll, onReachBottom, onPullDownRefresh} from '@dcloudio/uni-app';
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/** mescroll-more示例写在子组件时,需通过useMescrollMore补充子组件缺少的生命周期, 相当于vue2的mescroll-more.js文件 */
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function useMescrollMore(mescrollItems, onPageScroll, onReachBottom, onPullDownRefresh){
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// 当前tab下标
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const tabIndex = ref(0)
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// 因为子组件无onPageScroll和onReachBottom的页面生命周期，需在页面传递进到子组件
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onPageScroll && onPageScroll(e=>{
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handlePageScroll(e)
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})
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onReachBottom && onReachBottom(()=>{
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handleReachBottom()
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})
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// 当down的native: true时, 还需传递此方法进到子组件
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onPullDownRefresh && onPullDownRefresh(()=>{
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handlePullDownRefresh()
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})
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const handlePageScroll = (e)=>{
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let mescroll = getMescroll(tabIndex.value);
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mescroll && mescroll.onPageScroll(e);
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}
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const handleReachBottom = ()=>{
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let mescroll = getMescroll(tabIndex.value);
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mescroll && mescroll.onReachBottom();
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}
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const handlePullDownRefresh = ()=>{
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let mescroll = getMescroll(tabIndex.value);
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mescroll && mescroll.onPullDownRefresh();
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}
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// 根据下标获取对应子组件的mescroll
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const getMescroll = (i)=>{
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if (mescrollItems && mescrollItems[i]) {
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return mescrollItems[i].value.getMescroll()
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} else{
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return null
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}
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}
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// 切换tab,恢复滚动条位置
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const scrollToLastY = ()=>{
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let mescroll = getMescroll(tabIndex.value);
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if(mescroll){
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// 恢复上次滚动条的位置
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let y = mescroll.getScrollTop()
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mescroll.scrollTo(y, 0)
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// 再次恢复上次滚动条的位置, 确保元素已渲染
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setTimeout(()=>{
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mescroll.scrollTo(y, 0)
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},20)
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}
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}
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return {
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tabIndex,
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getMescroll,
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scrollToLastY
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}
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}
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export default useMescrollMore |