mirror of
https://gitee.com/huangge1199_admin/vue-pro.git
synced 2024-11-24 16:21:53 +08:00
122 lines
3.6 KiB
XML
122 lines
3.6 KiB
XML
/**
|
||
* 使用wxs方案实现slider
|
||
* 兼容微信，QQ，H5，Vue版的安卓和iOS
|
||
*/
|
||
/**
|
||
* 开始滑动操作
|
||
* @param {Object} e
|
||
* @param {Object} ownerInstance
|
||
*/
|
||
function onTouchMove(e, ownerInstance) {
|
||
// 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
|
||
// https://developers.weixin.qq.com/miniprogram/dev/framework/view/interactive-animation.html
|
||
var instance = e.instance;
|
||
// 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
|
||
var state = instance.getState()
|
||
|
||
// 滑块组件的整体尺寸信息
|
||
var mp = state.mp
|
||
if(mp.disabled) {
|
||
return
|
||
}
|
||
|
||
var distanceX = getTouchX(e) - mp.left
|
||
// 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
|
||
var percent = (distanceX / mp.width) * 100
|
||
|
||
updateSliderPlacement(instance, ownerInstance, percent, 'moving')
|
||
|
||
// 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
|
||
e.stopPropagation && e.stopPropagation()
|
||
e.preventDefault && e.preventDefault()
|
||
}
|
||
|
||
function onClick(e, ownerInstance) {
|
||
var instance = e.instance
|
||
var state = instance.getState()
|
||
var mp = state.mp
|
||
if(mp.disabled) {
|
||
return
|
||
}
|
||
|
||
// 直接点击滑块的情况，计算方式与onTouchMove方法相同
|
||
var value = ((e.detail.x - mp.left) / mp.width) * 100
|
||
updateSliderPlacement(instance, ownerInstance, value, 'click')
|
||
}
|
||
|
||
function sizeReady(newValue, oldValue, ownerInstance, instance) {
|
||
// 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
|
||
if(!newValue || newValue.disabled) {
|
||
return
|
||
}
|
||
var state = instance.getState()
|
||
state.mp = newValue
|
||
updateSliderPlacement(instance, ownerInstance, newValue.value)
|
||
}
|
||
|
||
// 设置滑点的位置
|
||
function updateSliderPlacement(instance, ownerInstance, value, event) {
|
||
var state = instance.getState()
|
||
var mp = state.mp
|
||
if(mp.disabled) {
|
||
return
|
||
}
|
||
|
||
var percent = 0
|
||
if (mp.step > 1) {
|
||
// 如果step步进大于1，需要跳步，所以需要使用Math.round进行取整
|
||
percent = Math.round(Math.max(mp.min, Math.min(value, mp.max)) / mp.step) * mp.step
|
||
} else {
|
||
// 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
|
||
percent = Math.max(mp.min, Math.min(value, mp.max))
|
||
}
|
||
// 返回组件的实例
|
||
var gapInstance = ownerInstance.selectComponent('.u-slider__gap')
|
||
// 在移动期间，不允许transition动画，否则会造成卡顿
|
||
gapInstance[event === 'click' ? 'addClass' : 'removeClass']('u-slider__gap--ani')
|
||
// 调用逻辑层的方法，修改v-model绑定的值
|
||
ownerInstance.callMethod('updateValue', Math.round(percent))
|
||
if(event) {
|
||
ownerInstance.callMethod('emitEvent', {
|
||
event: event,
|
||
value: Math.round(percent)
|
||
})
|
||
}
|
||
|
||
// 设置移动的值
|
||
gapInstance.requestAnimationFrame(function() {
|
||
gapInstance.setStyle({
|
||
width: percent / 100 * mp.width + 'px',
|
||
})
|
||
})
|
||
}
|
||
|
||
// 开始滑动
|
||
function onTouchStart(e, ownerInstance) {
|
||
ownerInstance.callMethod('emitEvent', {
|
||
event: 'start',
|
||
value: null
|
||
})
|
||
}
|
||
|
||
// 停止滑动
|
||
function onTouchEnd(e, ownerInstance) {
|
||
ownerInstance.callMethod('emitEvent', {
|
||
event: 'end',
|
||
value: null
|
||
})
|
||
}
|
||
|
||
// 获取当前手势点的X轴位移值
|
||
function getTouchX(e) {
|
||
return e.touches[0].clientX
|
||
}
|
||
|
||
module.exports = {
|
||
onTouchStart: onTouchStart,
|
||
onTouchMove: onTouchMove,
|
||
onTouchEnd: onTouchEnd,
|
||
sizeReady: sizeReady,
|
||
onClick: onClick
|
||
}
|