<template>
  <transition name="fade" mode="out-in" v-if="isShow">
    <div class="ls-mask" v-loading="loading">
      <div class="ls-mask-window" :style="{'width':width,'height':height}">
        <div class="ls-head">
          <div class="ls-title" :style="{'text-align':titleStyle}">
            <svg-icon v-if="iconClass!=''" :icon-class='iconClass' />
            <b>{{title}}</b>
          </div>
          <svg-icon icon-class='close' class="closeStyle" @click="onCancel" />
        </div>

        <div class="ls-mask-content" ref='contentRef' :style="{'height': contentHeight}">
          <component :is="editItem" ref='childRef' @loading='loadingFn' :key="key" :formData='formData' />
        </div>
        <div class="ls-mask-footer" v-if='btnShow'>
          <el-button type="primary" @click="onConfirm">{{confirmText}}</el-button>
          <el-button @click="onCancel">{{cancelText}}</el-button>
        </div>
      </div>
    </div>
  </transition>
</template>
<script>
export default {
  name: 'index',
  data () {
    return {
      btnShow:false,
      title: '提示',
      cancelText: '取消',
      confirmText: '确认',
      isSync: false,
      isShow: false,
      cancel: function () { },
      confirm: function () { },
      editItem: "",
      titleStyle: 'center',
      width: "75%",
      height: "auto",
      formData: "",//父组件传递的参数 负责传给子组件
      contentHeight: "",
      iconClass: "",
      key: 0
    }
  },
  props: {
    loading: { type: Boolean, default: false },
  },
  watch: {
    isShow (a, b) {
      this.key++
      this.editItem = this.loadViewFn(this.editItem)
    },
  },
  mounted () {
    //  计算滚动条高度
    setTimeout(() => {
      if(this.btnShow){ //判断按钮的显影来决定是否需要计算高度
        if(this.height == 'auto'){
        this.contentHeight = (this.$refs.contentRef.offsetHeight - 115) + 'px'
      }else{
        this.contentHeight =(parseInt(this.height)-parseInt('115px'))+'px';
      }
      }else{
        if(this.height == 'auto'){
        this.contentHeight = this.$refs.contentRef.offsetHeight + 'px'
      }else{
        this.contentHeight =this.height
      }
      }
      
    }, 500)
  },
  methods: {
    onCancel () {
      this.isShow = false
      this.cancel()
    },
    onConfirm () {
      this.loading = true
      let isOk = this.$refs.childRef.childFn()  //子组件方法 必须命名一致
      if (isOk || isOk == undefined) { //如果子组件没有 return false 就代表子组件方法一切正常
        this.isShow = false
        this.confirm()
      } else { //否则
        console.log('弹窗不关闭')
      }
    },
    loadingFn (e) { //加载状态
      this.loading = e
    },
    loadViewFn (view) {
      return (r) =>
        require.ensure([], () =>
          r(require(`@/views/${view}.vue`))
        );
    }
  }
}
</script>
<style scoped>
#app {
  overflow: hidden;
}

.ls-mask {
  width: 100%;
  height: 100%;
  z-index: 2001;
  position: fixed;
  left: 0;
  top: 0;
  background: rgba(0, 0, 0, 0.3);

}

.ls-mask-window {
  background: white;
  position: relative;
  left: 50%;
  top: 50%;
  min-height: 200px;
  transform: translate(-50%, -50%);
  border-radius: 10px;
}

.ls-mask-window b {
  padding-left: 5px;
}

.ls-title {
  padding: 16px;
  color: #ffffff;
  background: linear-gradient(-2deg,#409EFF, transparent)
}

.ls-title .svg-icon {
  font-size: 18px;
}

.ls-mask-content {
  padding: 20px;
  width: 100%;
  overflow: scroll;
}

.ls-mask-footer {
  height: 65px;
  display: flex;
  justify-content: center;
  width: 100%;
  box-shadow: 0px 0px 2px 0px;
  border-radius: 0 0 10px 10px;
  position: absolute;
    bottom: 0;
    background: #ffffff;
}


/deep/.closeStyle {
  position: absolute;
  top: 17px;
  right: 12px;
  font-size: 20px;
  cursor: pointer;
  color: #ffffff;
}

/deep/.el-loading-mask {
  background: none;
}

/deep/.el-button {
  margin: 15px 10px;
  width: 75px;
}
</style>