环形进度条组件

Posted 2022-08-07 黑胡子大叔的小屋

<template>
  <div class="content" ref="box">
    <svg
      :id="idStr"
      style="transform: rotate(-90deg)"
      :width="width"
      :height="width"
      xmlns="http://www.w3.org/2000/svg"
    >
      <linearGradient :id="`gradient-$id`" gradientUnits="userSpaceOnUse">
        <stop
          v-for="(item, index) in gradientsColor"
          :key="index"
          :offset="item.offset"
          :stop-color="item.color"
        />
      </linearGradient>
      <circle
        :r="(width-radius)/2"
        :cy="width/2"
        :cx="width/2"
        :stroke-width="radius"
        :stroke="backgroundColor"
        fill="none"
      />
      <circle
        v-if="gradientsColorShow"
        ref="$bar"
        :r="(width-radius)/2"
        :cy="width/2"
        :cx="width/2"
        :stroke="gradientsColor ? `url(#gradient-$id)` : barColor"
        :stroke-width="radius"
        :stroke-linecap="isRound ? 'round' : 'square'"
        :stroke-dasharray="(width-radius)*3.14"
        :stroke-dashoffset="dashoffsetValue"
        fill="none"
      />
    </svg>
    <div class="center_text">
      <p v-if="!$slots.default" class="title">progress%</p>
      <slot></slot>
    </div>
  </div>
</template>

<script>
// import _ from "lodash";
export default 
  props: 
    widthPresent: 
      type: Number,
      default: 1
    ,
    gradientsColor: 
      type: [Boolean, Array],
      default: false
    ,
    radius: 
      type: [Number, String],
      default: 20
    , // 进度条厚度
    progress: 
      type: [Number, String],
      default: 20
    , // 进度条百分比
    barColor: 
      type: String,
      default: "#1890ff"
    , // 进度条颜色
    backgroundColor: 
      type: String,
      default: "rgba(0,0,0,0.3)"
    , // 背景颜色
    isAnimation: 
      // 是否是动画效果
      type: Boolean,
      default: true
    ,
    isRound: 
      // 是否是圆形画笔
      type: Boolean,
      default: true
    ,
    id: 
      // 组件的id，多组件共存时使用
      type: [String, Number],
      default: 1
    ,
    duration: 
      // 整个动画时长
      type: [String, Number],
      default: 1000
    ,
    delay: 
      // 延迟多久执行
      type: [String, Number],
      default: 200
    ,
    timeFunction: 
      // 动画缓动函数
      type: String,
      default: "cubic-bezier(0.99, 0.01, 0.22, 0.94)"
    
  ,
  data() 
    return 
      width: 200,
      idStr: "",
      oldValue: 0
    ;
  ,
  computed: 
    gradientsColorShow: function() 
      return true;
    ,
    dashoffsetValue: function() 
      const  isAnimation, width, radius, progress, oldValue  = this;
      return isAnimation
        ? ((width - radius) * 3.14 * (100 - oldValue)) / 100
        : ((width - radius) * 3.14 * (100 - progress)) / 100;
    
  ,
  watch: 
    id: function() 
      this.idStr = `circle_progress_keyframes_$this.id || 1`;
    ,
    progress: function(newData, oldData) 
      if (newData !== oldData) 
        this.oldValue = oldData;
        this.setAnimation();
      
    
  ,
  mounted() 
    this.idStr = `circle_progress_keyframes_$this.id || 1`;
    let self = this;
    this.setCircleWidth();
    this.setAnimation();
    // 此处不能使用window.onresize
    window.addEventListener("resize", function() 
      self.setCircleWidth();
      self.setAnimation(self);
    );
  ,
  methods: 
    setCircleWidth() 
      const  widthPresent  = this;
      this.$nextTick(() => 
        let box = this.$refs.box;
        let width = box.clientWidth * widthPresent;
        let height = box.clientHeight * widthPresent;
        let cW = width > height ? height : width;
        this.width = cW;
      )
    ,
    setAnimation() 
      let self = this;
      if (self.isAnimation) 
        // 重复定义判断
        if (document.getElementById(self.idStr)) 
          self.$refs.$bar.classList.remove(`circle_progress_bar$self.id`);
        
        this.$nextTick(() => 
          this.startAnimation();
        );
      
    ,
    startAnimation() 
      // 生成动画样式文件
      let style = document.createElement("style");
      style.id = this.idStr;
      style.type = "text/css";
      style.innerhtml = `
      @keyframes circle_progress_keyframes_name_$this.id 
      from stroke-dashoffset: $((this.width - this.radius) *
        3.14 *
        (100 - this.oldValue)) /
        100px;
      to stroke-dashoffset: $((this.width - this.radius) *
        3.14 *
        (100 - this.progress)) /
        100px;
      .circle_progress_bar$
        this.id
       animation: circle_progress_keyframes_name_$this.id $
        this.duration
      ms $this.delayms $this.timeFunction forwards;`;
      // 添加新样式文件
      document.getElementsByTagName("head")[0].appendChild(style);
      // 往svg元素中添加动画class
      this.$refs.$bar.classList.add(`circle_progress_bar$this.id`);
    
  
;
</script>
<style  scoped>
.content 
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;

.center_text 
  position: absolute;
  font-size: 16px;
  font-weight: bold;

</style>