Making a sliding stack component by using vue (detailed tutorial)

Tantan’s stacked sliding component plays a key role. Let’s take a look at how to use vue to write a Tantan stacked component. Friends who are interested can take a look.

The effect diagram is as follows ：

Preface

Hi, say Tantan must be familiar to all programmers (after all, there are many girls). Tantan’s stacked sliding components play a key role in being able to flip brands on it smoothly. Let’s take a look at how to write a Tantan using Vue. Stacking components

1. Function analysis

After simple use, you will find that the function of stacking and sliding is very simple, just use a picture The summary is:

A brief summary of the basic functional points included:

• Stacking of pictures

• Slide of the first picture

• Slide out after the condition is successful, rebound after the condition fails

• Slide out The next picture is stacked to the top

• Experience Optimization

• According to the different touch points, the first picture will be offset at different angles when sliding

• Determine whether the offset area has successfully slid out
  

2. Specific implementation

With the summarized functional points, our ideas for implementing components will be clearer

1. Stacking effect

The stacking picture effect is available online A large number of examples, the implementation methods are similar, mainly by setting perspective and perspective-origin on the parent layer to achieve the perspective of the sub-layer. After setting the translate3d Z-axis value on the sub-layer, the stacking effect can be simulated. The specific code is as follows

// 图片堆叠dom
 <!--opacity: 0 隐藏我们不想看到的stack-item层级-->
 <!--z-index: -1 调整stack-item层级"-->
<ul class="stack">
 <li class="stack-item" style="transform: translate3d(0px, 0px, 0px);opacity: 1;z-index: 10;"><img src="1.png" alt="01"></li>
 <li class="stack-item" style="transform: translate3d(0px, 0px, -60px);opacity: 1;z-index: 1"><img src="2.png" alt="02"></li>
 <li class="stack-item" style="transform: translate3d(0px, 0px, -120px);opacity: 1;z-index: 1"><img src="3.png" alt="03"></li>
 <li class="stack-item" style="transform: translate3d(0px, 0px, -180px);opacity: 0;z-index: -1"><img src="4.png" alt="04"></li>
 <li class="stack-item" style="transform: translate3d(0px, 0px, -180px);opacity: 0;z-index: -1"><img src="5.png" alt="05"></li>
</ul>
<style>
.stack {
 width: 100%;
 height: 100%;
 position: relative;
 perspective: 1000px; //子元素视距
 perspective-origin: 50% 150%; //子元素透视位置
 -webkit-perspective: 1000px;
 -webkit-perspective-origin: 50% 150%;
 margin: 0;
 padding: 0;
 }
 .stack-item{
 background: #fff;
 height: 100%;
 width: 100%;
 border-radius: 4px;
 text-align: center;
 overflow: hidden;
 }
 .stack-item img {
 width: 100%;
 display: block;
 pointer-events: none;
 }
</style>

The above is just a set of static code. What we hope to get is the vue component, so we need to create a component template stack.vue first. In the template we can use v -for, traverse the stack node, use :style to modify the style of each item, the code is as follows

<template>
 <ul class="stack">
  <li class="stack-item" v-for="(item, index) in pages" :style="[transform(index)]">
  <img :src="item.src">
  </li>
 </ul>
</template>
<script>
export default {
 props: {
 // pages数据包含基础的图片数据
 pages: {
  type: Array,
  default: []
 }
 },
 data () {
 return {
  // basicdata数据包含组件基本数据
  basicdata: {
  currentPage: 0 // 默认首图的序列
  },
  // temporaryData数据包含组件临时数据
  temporaryData: {
  opacity: 1, // 记录opacity
  zIndex: 10, // 记录zIndex
  visible: 3 // 记录默认显示堆叠数visible
  }
 }
 },
 methods: {
 // 遍历样式
 transform (index) {
  if (index >= this.basicdata.currentPage) {
  let style = {}
  let visible = this.temporaryData.visible
  let perIndex = index - this.basicdata.currentPage
  // visible可见数量前滑块的样式
  if (index <= this.basicdata.currentPage + visible - 1) {
   style[&#39;opacity&#39;] = &#39;1&#39;
   style[&#39;transform&#39;] = &#39;translate3D(0,0,&#39; + -1 * perIndex * 60 + &#39;px&#39; + &#39;)&#39;
   style[&#39;zIndex&#39;] = visible - index + this.basicdata.currentPage
   style[&#39;transitionTimingFunction&#39;] = &#39;ease&#39;
   style[&#39;transitionDuration&#39;] = 300 + &#39;ms&#39;
  } else {
   style[&#39;zIndex&#39;] = &#39;-1&#39;
   style[&#39;transform&#39;] = &#39;translate3D(0,0,&#39; + -1 * visible * 60 + &#39;px&#39; + &#39;)&#39;
  }
  return style
  }
 }
 }
}
</script>

##Key points

: style can bind objects as well as arrays and functions, which is very useful when traversing

The most basic dom structure has been constructed, the next step is to let the first The picture "moves"

2. Picture sliding

The picture sliding effect appears in many scenes. Its principle is nothing more than monitoring the touches event and getting the displacement. , and then change the target displacement through translate3D, so the steps we want to implement are as follows

• Bind the touches event to the stack

• Listen and store The numerical value of the gesture position change

• Change the x and y values ​​​​of translate3D in the css attribute of the first image

Specific implementation

In the vue framework, it is not recommended to directly operate nodes, but to bind elements through the instruction v-on, so we write the bindings in v-for traversal, and use index to determine whether it is the first image. , and then use :style to modify the style of the homepage. The specific code is as follows:

<template>
 <ul class="stack">
  <li class="stack-item" v-for="(item, index) in pages"
  :style="[transformIndex(index),transform(index)]"
  @touchstart.stop.capture="touchstart"
  @touchmove.stop.capture="touchmove"
  @touchend.stop.capture="touchend"
  @mousedown.stop.capture="touchstart"
  @mouseup.stop.capture="touchend"
  @mousemove.stop.capture="touchmove">
  <img :src="item.src">
  </li>
 </ul>
</template>
<script>
export default {
 props: {
 // pages数据包含基础的图片数据
 pages: {
  type: Array,
  default: []
 }
 },
 data () {
 return {
  // basicdata数据包含组件基本数据
  basicdata: {
  start: {}, // 记录起始位置
  end: {}, // 记录终点位置
  currentPage: 0 // 默认首图的序列
  },
  // temporaryData数据包含组件临时数据
  temporaryData: {
  poswidth: &#39;&#39;, // 记录位移
  posheight: &#39;&#39;, // 记录位移
  tracking: false // 是否在滑动，防止多次操作，影响体验
  }
 }
 },
 methods: {
 touchstart (e) {
  if (this.temporaryData.tracking) {
  return
  }
  // 是否为touch
  if (e.type === &#39;touchstart&#39;) {
  if (e.touches.length > 1) {
   this.temporaryData.tracking = false
   return
  } else {
   // 记录起始位置
   this.basicdata.start.t = new Date().getTime()
   this.basicdata.start.x = e.targetTouches[0].clientX
   this.basicdata.start.y = e.targetTouches[0].clientY
   this.basicdata.end.x = e.targetTouches[0].clientX
   this.basicdata.end.y = e.targetTouches[0].clientY
  }
  // pc操作
  } else {
  this.basicdata.start.t = new Date().getTime()
  this.basicdata.start.x = e.clientX
  this.basicdata.start.y = e.clientY
  this.basicdata.end.x = e.clientX
  this.basicdata.end.y = e.clientY
  }
  this.temporaryData.tracking = true
 },
 touchmove (e) {
  // 记录滑动位置
  if (this.temporaryData.tracking && !this.temporaryData.animation) {
  if (e.type === &#39;touchmove&#39;) {
   this.basicdata.end.x = e.targetTouches[0].clientX
   this.basicdata.end.y = e.targetTouches[0].clientY
  } else {
   this.basicdata.end.x = e.clientX
   this.basicdata.end.y = e.clientY
  }
  // 计算滑动值
  this.temporaryData.poswidth = this.basicdata.end.x - this.basicdata.start.x
  this.temporaryData.posheight = this.basicdata.end.y - this.basicdata.start.y
  }
 },
 touchend (e) {
  this.temporaryData.tracking = false
  // 滑动结束，触发判断
 },
 // 非首页样式切换
 transform (index) {
  if (index > this.basicdata.currentPage) {
  let style = {}
  let visible = 3
  let perIndex = index - this.basicdata.currentPage
  // visible可见数量前滑块的样式
  if (index <= this.basicdata.currentPage + visible - 1) {
   style[&#39;opacity&#39;] = &#39;1&#39;
   style[&#39;transform&#39;] = &#39;translate3D(0,0,&#39; + -1 * perIndex * 60 + &#39;px&#39; + &#39;)&#39;
   style[&#39;zIndex&#39;] = visible - index + this.basicdata.currentPage
   style[&#39;transitionTimingFunction&#39;] = &#39;ease&#39;
   style[&#39;transitionDuration&#39;] = 300 + &#39;ms&#39;
  } else {
   style[&#39;zIndex&#39;] = &#39;-1&#39;
   style[&#39;transform&#39;] = &#39;translate3D(0,0,&#39; + -1 * visible * 60 + &#39;px&#39; + &#39;)&#39;
  }
  return style
  }
 },
 // 首页样式切换
 transformIndex (index) {
  // 处理3D效果
  if (index === this.basicdata.currentPage) {
  let style = {}
  style[&#39;transform&#39;] = &#39;translate3D(&#39; + this.temporaryData.poswidth + &#39;px&#39; + &#39;,&#39; + this.temporaryData.posheight + &#39;px&#39; + &#39;,0px)&#39;
  style[&#39;opacity&#39;] = 1
  style[&#39;zIndex&#39;] = 10
  return style
  }
 }
 }
}
</script>

3. Slide out after the condition is successful, and return after the condition fails. The triggering judgment of the bounce

condition is performed after touchend/mouseup. Here we first use simple conditions to judge, and at the same time give the first image the effect of popping up and rebounding. The code is as follows

<template>
 <ul class="stack">
  <li class="stack-item" v-for="(item, index) in pages"
  :style="[transformIndex(index),transform(index)]"
  @touchmove.stop.capture="touchmove"
  @touchstart.stop.capture="touchstart"
  @touchend.stop.capture="touchend"
  @mousedown.stop.capture="touchstart"
  @mouseup.stop.capture="touchend"
  @mousemove.stop.capture="touchmove">
  <img :src="item.src">
  </li>
 </ul>
</template>
<script>
export default {
 props: {
  // pages数据包含基础的图片数据
 pages: {
  type: Array,
  default: []
 }
 },
 data () {
 return {
  // basicdata数据包含组件基本数据
  basicdata: {
  start: {}, // 记录起始位置
  end: {}, // 记录终点位置
  currentPage: 0 // 默认首图的序列
  },
  // temporaryData数据包含组件临时数据
  temporaryData: {
  poswidth: &#39;&#39;, // 记录位移
  posheight: &#39;&#39;, // 记录位移
  tracking: false, // 是否在滑动，防止多次操作，影响体验
  animation: false, // 首图是否启用动画效果，默认为否
  opacity: 1 // 记录首图透明度
  }
 }
 },
 methods: {
 touchstart (e) {
  if (this.temporaryData.tracking) {
  return
  }
  // 是否为touch
  if (e.type === &#39;touchstart&#39;) {
  if (e.touches.length > 1) {
   this.temporaryData.tracking = false
   return
  } else {
   // 记录起始位置
   this.basicdata.start.t = new Date().getTime()
   this.basicdata.start.x = e.targetTouches[0].clientX
   this.basicdata.start.y = e.targetTouches[0].clientY
   this.basicdata.end.x = e.targetTouches[0].clientX
   this.basicdata.end.y = e.targetTouches[0].clientY
  }
  // pc操作
  } else {
  this.basicdata.start.t = new Date().getTime()
  this.basicdata.start.x = e.clientX
  this.basicdata.start.y = e.clientY
  this.basicdata.end.x = e.clientX
  this.basicdata.end.y = e.clientY
  }
  this.temporaryData.tracking = true
  this.temporaryData.animation = false
 },
 touchmove (e) {
  // 记录滑动位置
  if (this.temporaryData.tracking && !this.temporaryData.animation) {
  if (e.type === &#39;touchmove&#39;) {
   this.basicdata.end.x = e.targetTouches[0].clientX
   this.basicdata.end.y = e.targetTouches[0].clientY
  } else {
   this.basicdata.end.x = e.clientX
   this.basicdata.end.y = e.clientY
  }
  // 计算滑动值
  this.temporaryData.poswidth = this.basicdata.end.x - this.basicdata.start.x
  this.temporaryData.posheight = this.basicdata.end.y - this.basicdata.start.y
  }
 },
 touchend (e) {
  this.temporaryData.tracking = false
  this.temporaryData.animation = true
  // 滑动结束，触发判断
  // 简单判断滑动宽度超出100像素时触发滑出
  if (Math.abs(this.temporaryData.poswidth) >= 100) {
  // 最终位移简单设定为x轴200像素的偏移
  let ratio = Math.abs(this.temporaryData.posheight / this.temporaryData.poswidth)
  this.temporaryData.poswidth = this.temporaryData.poswidth >= 0 ? this.temporaryData.poswidth + 200 : this.temporaryData.poswidth - 200
  this.temporaryData.posheight = this.temporaryData.posheight >= 0 ? Math.abs(this.temporaryData.poswidth * ratio) : -Math.abs(this.temporaryData.poswidth * ratio)
  this.temporaryData.opacity = 0
  // 不满足条件则滑入
  } else {
  this.temporaryData.poswidth = 0
  this.temporaryData.posheight = 0
  }
 },
 // 非首页样式切换
 transform (index) {
  if (index > this.basicdata.currentPage) {
  let style = {}
  let visible = 3
  let perIndex = index - this.basicdata.currentPage
  // visible可见数量前滑块的样式
  if (index <= this.basicdata.currentPage + visible - 1) {
   style[&#39;opacity&#39;] = &#39;1&#39;
   style[&#39;transform&#39;] = &#39;translate3D(0,0,&#39; + -1 * perIndex * 60 + &#39;px&#39; + &#39;)&#39;
   style[&#39;zIndex&#39;] = visible - index + this.basicdata.currentPage
   style[&#39;transitionTimingFunction&#39;] = &#39;ease&#39;
   style[&#39;transitionDuration&#39;] = 300 + &#39;ms&#39;
  } else {
   style[&#39;zIndex&#39;] = &#39;-1&#39;
   style[&#39;transform&#39;] = &#39;translate3D(0,0,&#39; + -1 * visible * 60 + &#39;px&#39; + &#39;)&#39;
  }
  return style
  }
 },
 // 首页样式切换
 transformIndex (index) {
  // 处理3D效果
  if (index === this.basicdata.currentPage) {
  let style = {}
  style[&#39;transform&#39;] = &#39;translate3D(&#39; + this.temporaryData.poswidth + &#39;px&#39; + &#39;,&#39; + this.temporaryData.posheight + &#39;px&#39; + &#39;,0px)&#39;
  style[&#39;opacity&#39;] = this.temporaryData.opacity
  style[&#39;zIndex&#39;] = 10
  if (this.temporaryData.animation) {
   style[&#39;transitionTimingFunction&#39;] = &#39;ease&#39;
   style[&#39;transitionDuration&#39;] = 300 + &#39;ms&#39;
  }
  return style
  }
 }
 }
}
</script>

4. After sliding out, the next picture is stacked to the top

Re-stacking is the last function of the component, and it is also the most important and complex functions. In our code, the sorting of stack-item depends on the transformIndex and transform function of the binding: style. The condition determined in the function is currentPage. Is it necessary to change the currentPage to 1 to complete the re-stacking?

The answer is not that simple, because our slide out is an animation effect, which will last 300ms, and the rearrangement caused by the change of currentPage will change immediately, interrupting the progress of the animation. Therefore, we need to modify the sorting conditions of the transform function first, and then change the currentPage.

# Specific implementation

• Modify the transform function sorting conditions

• Let currentPage 1

• 
  Add the onTransitionEnd event, and after the slide-out is completed, relocate the stack list

##The code is as follows:

<template>
 <ul class="stack">
  <li class="stack-item" v-for="(item, index) in pages"
  :style="[transformIndex(index),transform(index)]"
  @touchmove.stop.capture="touchmove"
  @touchstart.stop.capture="touchstart"
  @touchend.stop.capture="touchend"
  @mousedown.stop.capture="touchstart"
  @mouseup.stop.capture="touchend"
  @mousemove.stop.capture="touchmove"
  @webkit-transition-end="onTransitionEnd"
  @transitionend="onTransitionEnd"
  >
  <img :src="item.src">
  </li>
 </ul>
</template>
<script>
export default {
 props: {
 // pages数据包含基础的图片数据
 pages: {
  type: Array,
  default: []
 }
 },
 data () {
 return {
  // basicdata数据包含组件基本数据
  basicdata: {
  start: {}, // 记录起始位置
  end: {}, // 记录终点位置
  currentPage: 0 // 默认首图的序列
  },
  // temporaryData数据包含组件临时数据
  temporaryData: {
  poswidth: &#39;&#39;, // 记录位移
  posheight: &#39;&#39;, // 记录位移
  lastPosWidth: &#39;&#39;, // 记录上次最终位移
  lastPosHeight: &#39;&#39;, // 记录上次最终位移
  tracking: false, // 是否在滑动，防止多次操作，影响体验
  animation: false, // 首图是否启用动画效果，默认为否
  opacity: 1, // 记录首图透明度
  swipe: false // onTransition判定条件
  }
 }
 },
 methods: {
 touchstart (e) {
  if (this.temporaryData.tracking) {
  return
  }
  // 是否为touch
  if (e.type === &#39;touchstart&#39;) {
  if (e.touches.length > 1) {
   this.temporaryData.tracking = false
   return
  } else {
   // 记录起始位置
   this.basicdata.start.t = new Date().getTime()
   this.basicdata.start.x = e.targetTouches[0].clientX
   this.basicdata.start.y = e.targetTouches[0].clientY
   this.basicdata.end.x = e.targetTouches[0].clientX
   this.basicdata.end.y = e.targetTouches[0].clientY
  }
  // pc操作
  } else {
  this.basicdata.start.t = new Date().getTime()
  this.basicdata.start.x = e.clientX
  this.basicdata.start.y = e.clientY
  this.basicdata.end.x = e.clientX
  this.basicdata.end.y = e.clientY
  }
  this.temporaryData.tracking = true
  this.temporaryData.animation = false
 },
 touchmove (e) {
  // 记录滑动位置
  if (this.temporaryData.tracking && !this.temporaryData.animation) {
  if (e.type === &#39;touchmove&#39;) {
   this.basicdata.end.x = e.targetTouches[0].clientX
   this.basicdata.end.y = e.targetTouches[0].clientY
  } else {
   this.basicdata.end.x = e.clientX
   this.basicdata.end.y = e.clientY
  }
  // 计算滑动值
  this.temporaryData.poswidth = this.basicdata.end.x - this.basicdata.start.x
  this.temporaryData.posheight = this.basicdata.end.y - this.basicdata.start.y
  }
 },
 touchend (e) {
  this.temporaryData.tracking = false
  this.temporaryData.animation = true
  // 滑动结束，触发判断
  // 简单判断滑动宽度超出100像素时触发滑出
  if (Math.abs(this.temporaryData.poswidth) >= 100) {
  // 最终位移简单设定为x轴200像素的偏移
  let ratio = Math.abs(this.temporaryData.posheight / this.temporaryData.poswidth)
  this.temporaryData.poswidth = this.temporaryData.poswidth >= 0 ? this.temporaryData.poswidth + 200 : this.temporaryData.poswidth - 200
  this.temporaryData.posheight = this.temporaryData.posheight >= 0 ? Math.abs(this.temporaryData.poswidth * ratio) : -Math.abs(this.temporaryData.poswidth * ratio)
  this.temporaryData.opacity = 0
  this.temporaryData.swipe = true
  // 记录最终滑动距离
  this.temporaryData.lastPosWidth = this.temporaryData.poswidth
  this.temporaryData.lastPosHeight = this.temporaryData.posheight
  // currentPage+1 引发排序变化
  this.basicdata.currentPage += 1
  // currentPage切换，整体dom进行变化，把第一层滑动置零
  this.$nextTick(() => {
   this.temporaryData.poswidth = 0
   this.temporaryData.posheight = 0
   this.temporaryData.opacity = 1
  })
  // 不满足条件则滑入
  } else {
  this.temporaryData.poswidth = 0
  this.temporaryData.posheight = 0
  this.temporaryData.swipe = false
  }
 },
 onTransitionEnd (index) {
  // dom发生变化后，正在执行的动画滑动序列已经变为上一层
  if (this.temporaryData.swipe && index === this.basicdata.currentPage - 1) {
  this.temporaryData.animation = true
  this.temporaryData.lastPosWidth = 0
  this.temporaryData.lastPosHeight = 0
  this.temporaryData.swipe = false
  }
 },
 // 非首页样式切换
 transform (index) {
  if (index > this.basicdata.currentPage) {
  let style = {}
  let visible = 3
  let perIndex = index - this.basicdata.currentPage
  // visible可见数量前滑块的样式
  if (index <= this.basicdata.currentPage + visible - 1) {
   style[&#39;opacity&#39;] = &#39;1&#39;
   style[&#39;transform&#39;] = &#39;translate3D(0,0,&#39; + -1 * perIndex * 60 + &#39;px&#39; + &#39;)&#39;
   style[&#39;zIndex&#39;] = visible - index + this.basicdata.currentPage
   style[&#39;transitionTimingFunction&#39;] = &#39;ease&#39;
   style[&#39;transitionDuration&#39;] = 300 + &#39;ms&#39;
  } else {
   style[&#39;zIndex&#39;] = &#39;-1&#39;
   style[&#39;transform&#39;] = &#39;translate3D(0,0,&#39; + -1 * visible * 60 + &#39;px&#39; + &#39;)&#39;
  }
  return style
  // 已滑动模块释放后
  } else if (index === this.basicdata.currentPage - 1) {
  let style = {}
  // 继续执行动画
  style[&#39;transform&#39;] = &#39;translate3D(&#39; + this.temporaryData.lastPosWidth + &#39;px&#39; + &#39;,&#39; + this.temporaryData.lastPosHeight + &#39;px&#39; + &#39;,0px)&#39;
  style[&#39;opacity&#39;] = &#39;0&#39;
  style[&#39;zIndex&#39;] = &#39;-1&#39;
  style[&#39;transitionTimingFunction&#39;] = &#39;ease&#39;
  style[&#39;transitionDuration&#39;] = 300 + &#39;ms&#39;
  return style
  }
 },
 // 首页样式切换
 transformIndex (index) {
  // 处理3D效果
  if (index === this.basicdata.currentPage) {
  let style = {}
  style[&#39;transform&#39;] = &#39;translate3D(&#39; + this.temporaryData.poswidth + &#39;px&#39; + &#39;,&#39; + this.temporaryData.posheight + &#39;px&#39; + &#39;,0px)&#39;
  style[&#39;opacity&#39;] = this.temporaryData.opacity
  style[&#39;zIndex&#39;] = 10
  if (this.temporaryData.animation) {
   style[&#39;transitionTimingFunction&#39;] = &#39;ease&#39;
   style[&#39;transitionDuration&#39;] = 300 + &#39;ms&#39;
  }
  return style
  }
 }
 }
}
</script>

ok~ After completing the above four steps, the basic functions of the stacking component have been implemented. Come and see the effect

Stacking sliding effect It has already been released, but Tantan has also added touch angle offset and determination of slide-out area ratio in terms of experience

The principle of angle offset is to record the user's touch position every time the user touches, calculate the maximum offset angle, and when the sliding displacement occurs, linearly increase the angle to the maximum offset angle.

The specific thing to do when using the stack is:

• Calculate the required angle and direction in touchmove

• touchend And set the angle to zero in onTransitionEnd
  

## to determine the slide-out area ratio. The offset area is mainly calculated through the offset amount, thereby obtaining the area ratio and completing the judgment

The complete code and demo can be viewed on github. The source code will not be posted here.

Thank you everyone for reading this article. If you like it, you can give it a :star:️ on github. Finally, I wish you all the best. You can find your ex-girlfriend on Tantan: green_heart:

I compiled the above for everyone, I hope it will be helpful to everyone in the future.

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