122 lines
3.7 KiB
Plaintext
122 lines
3.7 KiB
Plaintext
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/**
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* 使用wxs方案实现slider
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* 兼容微信，QQ，H5，Vue版的安卓和iOS
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*/
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/**
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* 开始滑动操作
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* @param {Object} e
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* @param {Object} ownerInstance
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*/
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function onTouchMove(e, ownerInstance) {
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// wxs事件对象下有一个instance属性，表示当前触发此事件的组件的实例，通过该实例，可以获取相关的dataset，设置样式等信息
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// https://developers.weixin.qq.com/miniprogram/dev/framework/view/interactive-animation.html
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var instance = e.instance;
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// getState()为一个对象，挂载在instance上，类似组件的data一样，可以存放一些变量，供以后的触发事件中使用
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var state = instance.getState()
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// 滑块组件的整体尺寸信息
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var mp = state.mp
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if(mp.disabled) {
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return
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}
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var distanceX = getTouchX(e) - mp.left
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// 获得移动距离对整个滑块的百分比值，此为带有多位小数的值，step大于1时，不能用此更新视图
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var percent = (distanceX / mp.width) * 100
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updateSliderPlacement(instance, ownerInstance, percent, 'moving')
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// 阻止页面滚动，可以保证在滑动过程中，不让页面可以上下滚动，造成不好的体验
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e.stopPropagation && e.stopPropagation()
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e.preventDefault && e.preventDefault()
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}
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function onClick(e, ownerInstance) {
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var instance = e.instance
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var state = instance.getState()
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var mp = state.mp
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if(mp.disabled) {
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return
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}
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// 直接点击滑块的情况，计算方式与onTouchMove方法相同
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var value = ((e.detail.x - mp.left) / mp.width) * 100
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updateSliderPlacement(instance, ownerInstance, value, 'click')
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}
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function sizeReady(newValue, oldValue, ownerInstance, instance) {
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// 页面初始化时候，也会触发此方法，传递的值为空，这里不执行往后的逻辑
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if(!newValue || newValue.disabled) {
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return
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}
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var state = instance.getState()
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state.mp = newValue
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updateSliderPlacement(instance, ownerInstance, newValue.value)
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}
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// 设置滑点的位置
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function updateSliderPlacement(instance, ownerInstance, value, event) {
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var state = instance.getState()
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var mp = state.mp
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if(mp.disabled) {
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return
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}
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var percent = 0
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if (mp.step > 1) {
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// 如果step步进大于1，需要跳步，所以需要使用Math.round进行取整
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percent = Math.round(Math.max(mp.min, Math.min(value, mp.max)) / mp.step) * mp.step
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} else {
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// 当step=1时，无需跳步，充分利用wxs性能，滑块实时跟随手势，达到丝滑的效果
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percent = Math.max(mp.min, Math.min(value, mp.max))
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}
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// 返回组件的实例
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var gapInstance = ownerInstance.selectComponent('.u-slider__gap')
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// 在移动期间，不允许transition动画，否则会造成卡顿
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gapInstance[event === 'click' ? 'addClass' : 'removeClass']('u-slider__gap--ani')
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// 调用逻辑层的方法，修改v-model绑定的值
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ownerInstance.callMethod('updateValue', Math.round(percent))
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if(event) {
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ownerInstance.callMethod('emitEvent', {
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event: event,
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value: Math.round(percent)
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})
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}
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// 设置移动的值
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gapInstance.requestAnimationFrame(function() {
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gapInstance.setStyle({
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width: percent / 100 * mp.width + 'px',
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})
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})
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}
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// 开始滑动
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function onTouchStart(e, ownerInstance) {
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ownerInstance.callMethod('emitEvent', {
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event: 'start',
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value: null
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})
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}
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// 停止滑动
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function onTouchEnd(e, ownerInstance) {
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ownerInstance.callMethod('emitEvent', {
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event: 'end',
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value: null
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})
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}
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// 获取当前手势点的X轴位移值
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function getTouchX(e) {
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return e.touches[0].clientX
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}
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module.exports = {
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onTouchStart: onTouchStart,
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onTouchMove: onTouchMove,
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onTouchEnd: onTouchEnd,
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sizeReady: sizeReady,
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onClick: onClick
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}
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