qa-prevention-gwj-first-app/components/mescroll-uni/wxs/wxs.wxs

268 lines
9.7 KiB
XML
Raw Permalink Blame History

This file contains ambiguous Unicode characters!

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

// 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
// https://uniapp.dcloud.io/frame?id=wxs
// https://developers.weixin.qq.com/miniprogram/dev/framework/view/interactive-animation.html
// 模拟mescroll实例, 与mescroll.js的写法尽量保持一致
var me = {}
// ------ 自定义下拉刷新动画 start ------
/* 下拉过程中的回调,滑动过程一直在执行 (rate<1inOffset; rate>1为outOffset) */
me.onMoving = function (ins, rate, downHight){
ins.requestAnimationFrame(function () {
ins.selectComponent('.mescroll-wxs-content').setStyle({
'will-change': 'transform', // 可解决下拉过程中, image和swiper脱离文档流的问题
'transform': 'translateY(' + downHight + 'px)',
'transition': ''
})
// 环形进度条
var progress = ins.selectComponent('.mescroll-wxs-progress')
progress && progress.setStyle({transform: 'rotate(' + 360 * rate + 'deg)'})
})
}
/* 显示下拉刷新进度 */
me.showLoading = function (ins){
me.downHight = me.optDown.offset
ins.requestAnimationFrame(function () {
ins.selectComponent('.mescroll-wxs-content').setStyle({
'will-change': 'auto',
'transform': 'translateY(' + me.downHight + 'px)',
'transition': 'transform 300ms'
})
})
}
/* 结束下拉 */
me.endDownScroll = function (ins){
me.downHight = 0;
me.isDownScrolling = false;
ins.requestAnimationFrame(function () {
ins.selectComponent('.mescroll-wxs-content').setStyle({
'will-change': 'auto',
'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)
'transition': 'transform 300ms'
})
})
}
/* 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 */
me.clearTransform = function (ins){
ins.requestAnimationFrame(function () {
ins.selectComponent('.mescroll-wxs-content').setStyle({
'will-change': '',
'transform': '',
'transition': ''
})
})
}
// ------ 自定义下拉刷新动画 end ------
/**
* 监听逻辑层数据的变化 (实时更新数据)
*/
function propObserver(wxsProp) {
me.optDown = wxsProp.optDown
me.scrollTop = wxsProp.scrollTop
me.bodyHeight = wxsProp.bodyHeight
me.isDownScrolling = wxsProp.isDownScrolling
me.isUpScrolling = wxsProp.isUpScrolling
me.isUpBoth = wxsProp.isUpBoth
me.isScrollBody = wxsProp.isScrollBody
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
}
/**
* 监听逻辑层数据的变化 (调用wxs的方法)
*/
function callObserver(callProp, oldValue, ins) {
if (me.disabled()) return;
if(callProp.callType){
// 逻辑层App Service的style已失效,需在视图层Webview设置style
if(callProp.callType === 'showLoading'){
me.showLoading(ins)
}else if(callProp.callType === 'endDownScroll'){
me.endDownScroll(ins)
}else if(callProp.callType === 'clearTransform'){
me.clearTransform(ins)
}
}
}
/**
* touch事件
*/
function touchstartEvent(e, ins) {
me.downHight = 0; // 下拉的距离
me.startPoint = me.getPoint(e); // 记录起点
me.startTop = me.getScrollTop(); // 记录此时的滚动条位置
me.startAngle = 0; // 初始角度
me.lastPoint = me.startPoint; // 重置上次move的点
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)
me.inTouchend = false; // 标记不是touchend
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)
}
function touchmoveEvent(e, ins) {
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)
if (me.disabled()) return isPrevent;
var scrollTop = me.getScrollTop(); // 当前滚动条的距离
var curPoint = me.getPoint(e); // 当前点
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
// 向下拉 && 在顶部
// mescroll-body,直接判定在顶部即可
// scroll-view在滚动时不会触发touchmove,当触顶/底/左/右时,才会触发touchmove
// 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
if (moveY > 0 && (
(me.isScrollBody && scrollTop <= 0)
||
(!me.isScrollBody && (scrollTop <= 0 || (scrollTop <= me.optDown.startTop && scrollTop === me.startTop)) )
)) {
// 可下拉的条件
if (!me.inTouchend && !me.isDownScrolling && !me.optDown.isLock && (!me.isUpScrolling || (me.isUpScrolling &&
me.isUpBoth))) {
// 下拉的角度是否在配置的范围内
if(!me.startAngle) me.startAngle = me.getAngle(me.lastPoint, curPoint); // 两点之间的角度,区间 [0,90]
if (me.startAngle < me.optDown.minAngle) return isPrevent; // ,
// ,,Webviewtouchend
if (me.maxTouchmoveY > 0 && curPoint.y >= me.maxTouchmoveY) {
me.inTouchend = true; // 标记执行touchend
touchendEvent(e, ins); // 提前触发touchend
return isPrevent;
}
isPrevent = false // 小程序是return false
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)
// 下拉距离 < 指定距离
if (me.downHight < me.optDown.offset) {
if (me.movetype !== 1) {
me.movetype = 1; // ,
// me.optDown.inOffset && me.optDown.inOffset(me); // ,
me.callMethod(ins, {type: 'setLoadType', downLoadType: 1})
me.isMoveDown = true; // ,touchend
}
me.downHight += diff * me.optDown.inOffsetRate; // ,
// <=
} else {
if (me.movetype !== 2) {
me.movetype = 2; // ,
// me.optDown.outOffset && me.optDown.outOffset(me); // ,
me.callMethod(ins, {type: 'setLoadType', downLoadType: 2})
me.isMoveDown = true; // ,touchend
}
if (diff > 0) { // 向下拉
me.downHight += diff * me.optDown.outOffsetRate; // 越往下,高度变化越小
} else { // 向上收
me.downHight += diff; // 向上收回高度,则向上滑多少收多少高度
}
}
me.downHight = Math.round(me.downHight) // 取整
var rate = me.downHight / me.optDown.offset; // 下拉区域当前高度与指定距离的比值
// me.optDown.onMoving && me.optDown.onMoving(me, rate, me.downHight); // 下拉过程中的回调,一直在执行
me.onMoving(ins, rate, me.downHight)
}
}
me.lastPoint = curPoint; // 记录本次移动的点
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)
}
function touchendEvent(e, ins) {
// 如果下拉区域高度已改变,则需重置回来
if (me.isMoveDown) {
if (me.downHight >= me.optDown.offset) {
// 符合触发刷新的条件
me.downHight = me.optDown.offset; // 更新下拉区域高度
// me.triggerDownScroll();
me.callMethod(ins, {type: 'triggerDownScroll'})
} else {
// 不符合的话 则重置
me.downHight = 0;
// me.optDown.endDownScroll && me.optDown.endDownScroll(me);
me.callMethod(ins, {type: 'endDownScroll'})
}
me.movetype = 0;
me.isMoveDown = false;
} else if (!me.isScrollBody && me.getScrollTop() === me.startTop) { // scroll-view到顶/左/右/底的滑动事件
var isScrollUp = me.getPoint(e).y - me.startPoint.y < 0; // ,,0,0
//
if (isScrollUp) {
//
var angle = me.getAngle(me.getPoint(e), me.startPoint); // , [0,90]
if (angle > 80) {
// 检查并触发上拉
// me.triggerUpScroll(true);
me.callMethod(ins, {type: 'triggerUpScroll'})
}
}
}
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)
}
/* 是否禁用下拉刷新 */
me.disabled = function(){
return !me.optDown || !me.optDown.use || me.optDown.native
}
/* 根据点击滑动事件获取第一个手指的坐标 */
me.getPoint = function(e) {
if (!e) {
return {x: 0,y: 0}
}
if (e.touches && e.touches[0]) {
return {x: e.touches[0].pageX,y: e.touches[0].pageY}
} else if (e.changedTouches && e.changedTouches[0]) {
return {x: e.changedTouches[0].pageX,y: e.changedTouches[0].pageY}
} else {
return {x: e.clientX,y: e.clientY}
}
}
/* 计算两点之间的角度: 区间 [0,90]*/
me.getAngle = function (p1, p2) {
var x = Math.abs(p1.x - p2.x);
var y = Math.abs(p1.y - p2.y);
var z = Math.sqrt(x * x + y * y);
var angle = 0;
if (z !== 0) {
angle = Math.asin(y / z) / Math.PI * 180;
}
return angle
}
/* 获取滚动条的位置 */
me.getScrollTop = function() {
return me.scrollTop || 0
}
/* 获取body的高度 */
me.getBodyHeight = function() {
return me.bodyHeight || 0;
}
/* 调用逻辑层的方法 */
me.callMethod = function(ins, param) {
if(ins) ins.callMethod('wxsCall', param)
}
/* 导出模块 */
module.exports = {
propObserver: propObserver,
callObserver: callObserver,
touchstartEvent: touchstartEvent,
touchmoveEvent: touchmoveEvent,
touchendEvent: touchendEvent
}