<template>
  <div class="saoma">
    <qrcode-stream
      @decode="onDecode"
      @init="onInit"
      style="height: 90vh; width: 100vw"
    >
      <div>
        <div class="qr-scanner">
          <div class="box">
            <div class="line"></div>
            <div class="angle"></div>
          </div>
        </div>
      </div>
    </qrcode-stream>
  </div>
</template>
 
<script>

export default {
  data() {
    return {
      result: '', // 扫码结果信息
      error: '' // 错误信息
    }
  },
  methods: {
    onDecode(result) {
      if (result) {
        this.$router.push({
          path: '/',
          query: {
            code: result,
          }
        })
      }
    },
    async onInit(promise) {
      try {
        await promise
      } catch (error) {
        if (error.name === 'NotAllowedError') {
          window.alert('您需要授予相机访问权限')
          this.$router.push({ path: '/' })
        } else if (error.name === 'NotFoundError') {
          this.$router.push({ path: '/' })
          window.alert('这个设备上没有摄像头')
        } else if (error.name === 'NotSupportedError') {
          this.$router.push({ path: '/' })
          window.alert('所需的安全上下文(HTTPS、本地主机)')
        } else if (error.name === 'NotReadableError') {
          this.$router.push({ path: '/' })
          window.alert('相机被占用')
        } else if (error.name === 'OverconstrainedError') {
          this.$router.push({ path: '/' })
          window.alert('安装摄像头不合适')
        } else if (error.name === 'StreamApiNotSupportedError') {
          this.$router.push({ path: '/' })
          window.alert('此浏览器不支持流API')
        }
      }
    },
  }
}
</script>
 
<style scoped>
.saoma {
  width: 100vw;
  height: 100vh;
}

.qr-scanner {
  background-image: linear-gradient(
      0deg,
      transparent 24%,
      rgba(32, 255, 77, 0.1) 25%,
      rgba(32, 255, 77, 0.1) 26%,
      transparent 27%,
      transparent 74%,
      rgba(32, 255, 77, 0.1) 75%,
      rgba(32, 255, 77, 0.1) 76%,
      transparent 77%,
      transparent
    ),
    linear-gradient(
      90deg,
      transparent 24%,
      rgba(32, 255, 77, 0.1) 25%,
      rgba(32, 255, 77, 0.1) 26%,
      transparent 27%,
      transparent 74%,
      rgba(32, 255, 77, 0.1) 75%,
      rgba(32, 255, 77, 0.1) 76%,
      transparent 77%,
      transparent
    );
  background-size: 3rem 3rem;
  background-position: -1rem -1rem;
  width: 100%;
  /* height: 100%; */
  height: 100vh;
  position: relative;
  background-color: #1110;
  /* background-color: #111; */
}
.qr-scanner .box {
  width: 213px;
  height: 213px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  overflow: hidden;
  border: 0.1rem solid rgba(0, 255, 51, 0.2);
  /* background: url('http://resource.beige.world/imgs/gongconghao.png') no-repeat center center; */
}
.qr-scanner .line {
  height: calc(100% - 2px);
  width: 100%;
  background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
  border-bottom: 3px solid #00ff33;
  transform: translateY(-100%);
  animation: radar-beam 2s infinite alternate;
  animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
  animation-delay: 1.4s;
}
.qr-scanner .box:after,
.qr-scanner .box:before,
.qr-scanner .angle:after,
.qr-scanner .angle:before {
  content: "";
  display: block;
  position: absolute;
  width: 3vw;
  height: 3vw;
  border: 0.2rem solid transparent;
}
.qr-scanner .box:after,
.qr-scanner .box:before {
  top: 0;
  border-top-color: #00ff33;
}
.qr-scanner .angle:after,
.qr-scanner .angle:before {
  bottom: 0;
  border-bottom-color: #00ff33;
}
.qr-scanner .box:before,
.qr-scanner .angle:before {
  left: 0;
  border-left-color: #00ff33;
}
.qr-scanner .box:after,
.qr-scanner .angle:after {
  right: 0;
  border-right-color: #00ff33;
}
@keyframes radar-beam {
  0% {
    transform: translateY(-100%);
  }
  100% {
    transform: translateY(0);
  }
}
</style>