this.isMoving = false
this.move.x = (this.move.x > this.width / this.ratio) ? this.width : 0
},
setTransition (isTransition = false) {
this.transitionClass = isTransition ? 'r-slide-menu-transition' : ''
}
上面，这段核心代码中有一个setTransition 函数，这个函数的作用是在手指离开的时候给容器元素添加transition属性，让容器有一个过渡动画，完成关闭或者打开动画；所以在手指按下去的瞬间需要把容器上的这个transition属性去除，避免滑动过程中出现容器和手指滑动延迟的不良体验。 最后提醒下，代码中使用translate3d而非translate的原因是为了启动移动端手机的动画3D加速，提升动画流畅度。最终代码如下：
<template>
<div class="r-slide-menu">
<div class="r-slide-menu-wrap" :class="transitionClass" :style="wrapStyle">
<slot name="menu"></slot>
</div>
<div class="r-slide-menu-content" :class="transitionClass" :style="contentStyle"
@touchstart="touchstart"
@touchmove="touchmove"
@touchend="touchend">
<slot></slot>
</div>
</div>
</template>
<script>
export default {
props: {
width: {
type: String,
default: '250'
},
ratio: {
type: Number,
default: 2
}
},
data () {
return {
isMoving: false,
transitionClass: '',
startPoint: {
X: 0,
y: 0
},
oldPoint: {
x: 0,
y: 0
},
move: {
x: 0,
y: 0
}
}
},
computed: {
wrapStyle () {
let style = {
width: `${this.width}px`,
left: `-${this.width / this.ratio}px`,
transform: `translate3d(${this.move.x / this.ratio}px, 0px, 0px)`
}
return style
},
contentStyle () {
let style = {
transform: `translate3d(${this.move.x}px, 0px, 0px)`
}
return style
}
},
methods: {
touchstart (e) {
this.oldPoint.x = e.touches[0].pageX
this.oldPoint.y = e.touches[0].pageY
this.startPoint.x = this.move.x
this.startPoint.y = this.move.y
this.setTransition()
},
touchmove (e) {
let newPoint = {
x: e.touches[0].pageX,
y: e.touches[0].pageY
}
let moveX = newPoint.x - this.oldPoint.x
let moveY = newPoint.y - this.oldPoint.y
if (Math.abs(moveX) < Math.abs(moveY)) return false
e.preventDefault()
this.isMoving = true
moveX = this.startPoint.x * 1 + moveX * 1
moveY = this.startPoint.y * 1 + moveY * 1
if (moveX >= this.width) {
this.move.x = this.width
} else if (moveX <= 0) {
this.move.x = 0
} else {
this.move.x = moveX
}
},
touchend (e) {
this.setTransition(true)
