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92 lines
3.0 KiB
JavaScript
92 lines
3.0 KiB
JavaScript
// 使用renderjs直接操作window对象,实现动态控制app和h5的bounce
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// bounce: iOS橡皮筋,Android半月弧,h5浏览器下拉背景等效果 (下拉刷新时禁止)
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// https://uniapp.dcloud.io/frame?id=renderjs
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// 与wxs的me实例一致
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var me = {}
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// 初始化window对象的touch事件 (仅初始化一次)
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if(window && !window.$mescrollRenderInit){
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window.$mescrollRenderInit = true
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window.addEventListener('touchstart', function(e){
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if (me.disabled()) return;
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me.startPoint = me.getPoint(e); // 记录起点
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}, {passive: true})
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window.addEventListener('touchmove', function(e){
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if (me.disabled()) return;
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if (me.getScrollTop() > 0) return; // 需在顶部下拉,才禁止bounce
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var curPoint = me.getPoint(e); // 当前点
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var moveY = curPoint.y - me.startPoint.y; // 和起点比,移动的距离,大于0向下拉,小于0向上拉
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// 向下拉
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if (moveY > 0) {
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// 可下拉的条件
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if (!me.isDownScrolling && !me.optDown.isLock && (!me.isUpScrolling || (me.isUpScrolling && me.isUpBoth))) {
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// 只有touch在mescroll的view上面,才禁止bounce
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var el = e.target;
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var isMescrollTouch = false;
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while (el && el.tagName && el.tagName !== 'UNI-PAGE-BODY' && el.tagName != "BODY") {
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var cls = el.classList;
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if (cls && cls.contains('mescroll-render-touch')) {
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isMescrollTouch = true
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break;
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}
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el = el.parentNode; // 继续检查其父元素
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}
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// 禁止bounce (不会对swiper和iOS侧滑返回造成影响)
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if (isMescrollTouch && e.cancelable && !e.defaultPrevented) e.preventDefault();
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}
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}
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}, {passive: false})
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}
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/* 获取滚动条的位置 */
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me.getScrollTop = function() {
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return me.scrollTop || 0
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}
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/* 是否禁用下拉刷新 */
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me.disabled = function(){
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return !me.optDown || !me.optDown.use || me.optDown.native
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}
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/* 根据点击滑动事件获取第一个手指的坐标 */
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me.getPoint = function(e) {
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if (!e) {
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return {x: 0,y: 0}
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}
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if (e.touches && e.touches[0]) {
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return {x: e.touches[0].pageX,y: e.touches[0].pageY}
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} else if (e.changedTouches && e.changedTouches[0]) {
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return {x: e.changedTouches[0].pageX,y: e.changedTouches[0].pageY}
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} else {
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return {x: e.clientX,y: e.clientY}
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}
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}
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/**
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* 监听逻辑层数据的变化 (实时更新数据)
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*/
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function propObserver(wxsProp) {
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me.optDown = wxsProp.optDown
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me.scrollTop = wxsProp.scrollTop
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me.isDownScrolling = wxsProp.isDownScrolling
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me.isUpScrolling = wxsProp.isUpScrolling
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me.isUpBoth = wxsProp.isUpBoth
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}
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/* 导出模块 */
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const renderBiz = {
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data() {
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return {
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propObserver: propObserver,
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}
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}
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}
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export default renderBiz; |