268 lines
11 KiB
Plaintext
268 lines
11 KiB
Plaintext
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// 使用wxs处理交互动画, 提高性能, 同时避免小程序bounce对下拉刷新的影响
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// https://uniapp.dcloud.io/frame?id=wxs
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// https://developers.weixin.qq.com/miniprogram/dev/framework/view/interactive-animation.html
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// 模拟mescroll实例, 与mescroll.js的写法尽量保持一致
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var me = {}
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// ------ 自定义下拉刷新动画 start ------
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/* 下拉过程中的回调,滑动过程一直在执行 (rate<1为inOffset; rate>1为outOffset) */
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me.onMoving = function (ins, rate, downHight){
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ins.requestAnimationFrame(function () {
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ins.selectComponent('.mescroll-wxs-content').setStyle({
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'will-change': 'transform', // 可解决下拉过程中, image和swiper脱离文档流的问题
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'transform': 'translateY(' + downHight + 'px)',
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'transition': ''
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})
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// 环形进度条
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var progress = ins.selectComponent('.mescroll-wxs-progress')
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progress && progress.setStyle({transform: 'rotate(' + 360 * rate + 'deg)'})
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})
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}
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/* 显示下拉刷新进度 */
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me.showLoading = function (ins){
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me.downHight = me.optDown.offset
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ins.requestAnimationFrame(function () {
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ins.selectComponent('.mescroll-wxs-content').setStyle({
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'will-change': 'auto',
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'transform': 'translateY(' + me.downHight + 'px)',
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'transition': 'transform 300ms'
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})
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})
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}
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/* 结束下拉 */
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me.endDownScroll = function (ins){
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me.downHight = 0;
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me.isDownScrolling = false;
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ins.requestAnimationFrame(function () {
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ins.selectComponent('.mescroll-wxs-content').setStyle({
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'will-change': 'auto',
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'transform': 'translateY(0)', // 不可以写空串,否则scroll-view渲染不完整 (延时350ms会调clearTransform置空)
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'transition': 'transform 300ms'
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})
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})
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}
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/* 结束下拉动画执行完毕后, 清除transform和transition, 避免对列表内容样式造成影响, 如: h5的list-msg示例下拉进度条漏出来等 */
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me.clearTransform = function (ins){
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ins.requestAnimationFrame(function () {
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ins.selectComponent('.mescroll-wxs-content').setStyle({
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'will-change': '',
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'transform': '',
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'transition': ''
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})
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})
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}
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// ------ 自定义下拉刷新动画 end ------
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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.bodyHeight = wxsProp.bodyHeight
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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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me.isScrollBody = wxsProp.isScrollBody
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me.startTop = wxsProp.scrollTop // 及时更新touchstart触发的startTop, 避免scroll-view快速惯性滚动到顶部取值不准确
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}
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/**
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* 监听逻辑层数据的变化 (调用wxs的方法)
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*/
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function callObserver(callProp, oldValue, ins) {
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if (me.disabled()) return;
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if(callProp.callType){
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// 逻辑层（App Service）的style已失效,需在视图层（Webview）设置style
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if(callProp.callType === 'showLoading'){
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me.showLoading(ins)
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}else if(callProp.callType === 'endDownScroll'){
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me.endDownScroll(ins)
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}else if(callProp.callType === 'clearTransform'){
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me.clearTransform(ins)
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}
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}
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}
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/**
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* touch事件
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*/
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function touchstartEvent(e, ins) {
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me.downHight = 0; // 下拉的距离
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me.startPoint = me.getPoint(e); // 记录起点
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me.startTop = me.getScrollTop(); // 记录此时的滚动条位置
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me.startAngle = 0; // 初始角度
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me.lastPoint = me.startPoint; // 重置上次move的点
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me.maxTouchmoveY = me.getBodyHeight() - me.optDown.bottomOffset; // 手指触摸的最大范围(写在touchstart避免body获取高度为0的情况)
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me.inTouchend = false; // 标记不是touchend
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me.callMethod(ins, {type: 'setWxsProp'}) // 同步更新wxsProp的数据 (小程序是异步的,可能touchmove先执行,才到propObserver; h5和app是同步)
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}
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function touchmoveEvent(e, ins) {
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var isPrevent = true // false表示不往上冒泡，相当于调用了同时调用了stopPropagation和preventDefault (对小程序生效, h5和app无效)
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if (me.disabled()) return isPrevent;
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var scrollTop = me.getScrollTop(); // 当前滚动条的距离
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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 && 在顶部
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// mescroll-body,直接判定在顶部即可
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// scroll-view在滚动时不会触发touchmove,当触顶/底/左/右时,才会触发touchmove
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// scroll-view滚动到顶部时,scrollTop不一定为0,也有可能大于0; 在iOS的APP中scrollTop可能为负数,不一定和startTop相等
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if (moveY > 0 && (
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(me.isScrollBody && scrollTop <= 0)
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(!me.isScrollBody && (scrollTop <= 0 || (scrollTop <= me.optDown.startTop && scrollTop === me.startTop)) )
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)) {
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// 可下拉的条件
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if (!me.inTouchend && !me.isDownScrolling && !me.optDown.isLock && (!me.isUpScrolling || (me.isUpScrolling &&
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me.isUpBoth))) {
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// 下拉的角度是否在配置的范围内
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if(!me.startAngle) me.startAngle = me.getAngle(me.lastPoint, curPoint); // 两点之间的角度,区间 [0,90]
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if (me.startAngle < me.optDown.minAngle) return isPrevent; // 如果小于配置的角度,则不往下执行下拉刷新
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// 如果手指的位置超过配置的距离,则提前结束下拉,避免Webview嵌套导致touchend无法触发
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if (me.maxTouchmoveY > 0 && curPoint.y >= me.maxTouchmoveY) {
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me.inTouchend = true; // 标记执行touchend
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touchendEvent(e, ins); // 提前触发touchend
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return isPrevent;
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}
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isPrevent = false // 小程序是return false
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var diff = curPoint.y - me.lastPoint.y; // 和上次比,移动的距离 (大于0向下,小于0向上)
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// 下拉距离 < 指定距离
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if (me.downHight < me.optDown.offset) {
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if (me.movetype !== 1) {
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me.movetype = 1; // 加入标记,保证只执行一次
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// me.optDown.inOffset && me.optDown.inOffset(me); // 进入指定距离范围内那一刻的回调,只执行一次
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me.callMethod(ins, {type: 'setLoadType', downLoadType: 1})
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me.isMoveDown = true; // 标记下拉区域高度改变,在touchend重置回来
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}
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me.downHight += diff * me.optDown.inOffsetRate; // 越往下,高度变化越小
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// 指定距离 <= 下拉距离
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} else {
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if (me.movetype !== 2) {
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me.movetype = 2; // 加入标记,保证只执行一次
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// me.optDown.outOffset && me.optDown.outOffset(me); // 下拉超过指定距离那一刻的回调,只执行一次
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me.callMethod(ins, {type: 'setLoadType', downLoadType: 2})
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me.isMoveDown = true; // 标记下拉区域高度改变,在touchend重置回来
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}
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if (diff > 0) { // 向下拉
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me.downHight += diff * me.optDown.outOffsetRate; // 越往下,高度变化越小
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} else { // 向上收
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me.downHight += diff; // 向上收回高度,则向上滑多少收多少高度
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}
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}
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me.downHight = Math.round(me.downHight) // 取整
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var rate = me.downHight / me.optDown.offset; // 下拉区域当前高度与指定距离的比值
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// me.optDown.onMoving && me.optDown.onMoving(me, rate, me.downHight); // 下拉过程中的回调,一直在执行
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me.onMoving(ins, rate, me.downHight)
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}
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}
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me.lastPoint = curPoint; // 记录本次移动的点
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return isPrevent // false表示不往上冒泡，相当于调用了同时调用了stopPropagation和preventDefault (对小程序生效, h5和app无效)
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}
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function touchendEvent(e, ins) {
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// 如果下拉区域高度已改变,则需重置回来
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if (me.isMoveDown) {
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if (me.downHight >= me.optDown.offset) {
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// 符合触发刷新的条件
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me.downHight = me.optDown.offset; // 更新下拉区域高度
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// me.triggerDownScroll();
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me.callMethod(ins, {type: 'triggerDownScroll'})
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} else {
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// 不符合的话 则重置
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me.downHight = 0;
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// me.optDown.endDownScroll && me.optDown.endDownScroll(me);
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me.callMethod(ins, {type: 'endDownScroll'})
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}
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me.movetype = 0;
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me.isMoveDown = false;
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} else if (!me.isScrollBody && me.getScrollTop() === me.startTop) { // scroll-view到顶/左/右/底的滑动事件
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var isScrollUp = me.getPoint(e).y - me.startPoint.y < 0; // 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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// 上滑
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if (isScrollUp) {
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// 需检查滑动的角度
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var angle = me.getAngle(me.getPoint(e), me.startPoint); // 两点之间的角度,区间 [0,90]
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if (angle > 80) {
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// 检查并触发上拉
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// me.triggerUpScroll(true);
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me.callMethod(ins, {type: 'triggerUpScroll'})
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}
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}
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}
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me.callMethod(ins, {type: 'setWxsProp'}) // 同步更新wxsProp的数据 (小程序是异步的,可能touchmove先执行,才到propObserver; h5和app是同步)
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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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/* 计算两点之间的角度: 区间 [0,90]*/
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me.getAngle = function (p1, p2) {
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var x = Math.abs(p1.x - p2.x);
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var y = Math.abs(p1.y - p2.y);
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var z = Math.sqrt(x * x + y * y);
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var angle = 0;
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if (z !== 0) {
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angle = Math.asin(y / z) / Math.PI * 180;
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}
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return angle
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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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/* 获取body的高度 */
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me.getBodyHeight = function() {
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return me.bodyHeight || 0;
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}
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/* 调用逻辑层的方法 */
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me.callMethod = function(ins, param) {
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if(ins) ins.callMethod('wxsCall', param)
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}
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/* 导出模块 */
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module.exports = {
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propObserver: propObserver,
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callObserver: callObserver,
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touchstartEvent: touchstartEvent,
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touchmoveEvent: touchmoveEvent,
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touchendEvent: touchendEvent
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}
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