FlowPacs/yudao-vue-ui/components/mescroll-uni/wxs/wxs.wxs
2021-11-24 23:33:06 +08:00

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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
// 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<1为inOffset; rate>1为outOffset) */
me.onMoving = function (ins, rate, downHight){
ins.requestAnimationFrame(function () {
ins.selectComponent('.mescroll-wxs-content').setStyle({
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({
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({
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({
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) {
if (me.disabled()) return true;
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) {
if (me.disabled()) return true;
// 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
}