// qrcode.vue
<template>
    <div>
        <van-image
            @click="$router.back()"
            :src="require('../assets/back.png')"
            />
        <p class="error">{{ error }}</p>
        <!--错误信息-->
        <!-- <p class="decode-result">
          扫描结果:
          <b>{{ result }}</b>
      </p> -->
        <!--扫描结果-->
        <!-- <p @click="openCamera">打开相机</p>
      <div v-show="show" class="cameraMessage">
          <p @click="closeCamera">关闭相机</p>
          <p @click="openFlash">打开手电筒</p>
          <p @click="switchCamera">相机反转</p>
      </div> -->
        <qrcode-stream
            v-show="qrcode"
           
            @decode="onDecode"
            @init="onInit"
        >
            <div>
                <div class="qr-scanner">
                    <div class="box">
                        <div class="line"></div>
                        <div class="angle"></div>
                    </div>
                    <div class="txt">
                        将二维码/条码放入框内，即自动扫描
                        <div class="myQrcode">我的二维码</div>
                    </div>
                </div>
            </div>
        </qrcode-stream>
    </div>
</template>

<script>
// 下载插件
// cnpm install --save  vue-qrcode-reader

// 引入
import { QrcodeStream } from "vue-qrcode-reader";

export default {
    // 注册
    components: { QrcodeStream },
    data() {
        return {
            result: "", // 扫码结果信息
            error: "", // 错误信息
            // show: false,
            // qrcode: false,
            qrcode: true,
            torchActive: false,
            camera: "rear",
            // camera: "front"
        };
    },
    methods: {
        onDecode(result) {
            console.log(result);
            this.result = result;
            this.$emit('success',result)
        },
        async onInit(promise) {
            // const { capabilities } = await promise;
            
            // const TORCH_IS_SUPPORTED = !!capabilities.torch;
            promise.catch(error=>{
                // alert(1111)
                 if (error.name === "NotAllowedError") {
                    this.error = "ERROR: 您需要授予相机访问权限";
                } else if (error.name === "NotFoundError") {
                    this.error = "ERROR: 这个设备上没有摄像头";
                } else if (error.name === "NotSupportedError") {
                    this.error = "ERROR: 所需的安全上下文(HTTPS、本地主机)";
                } else if (error.name === "NotReadableError") {
                    this.error = "ERROR: 相机被占用";
                } else if (error.name === "OverconstrainedError") {
                    this.error = "ERROR: 安装摄像头不合适";
                } else if (error.name === "StreamApiNotSupportedError") {
                    this.error = "ERROR: 此浏览器不支持流API";
                }
                // console.log(error.name)
            })
        },
        // 打开相机
        // openCamera() {
        //     this.camera = 'rear'
        //     this.qrcode = true
        //     this.show = true
        // },
        // 关闭相机
        // closeCamera() {
        //     this.camera = 'off'
        //     this.qrcode = false
        //     this.show = false
        // },
        // 打开手电筒
        // openFlash() {
        //     switch (this.torchActive) {
        //         case true:
        //             this.torchActive = false
        //             break
        //         case false:
        //             this.torchActive = true
        //             break
        //     }
        // },
        // 相机反转
        // switchCamera() {
        //     // console.log(this.camera);
        //     switch (this.camera) {
        //         case 'front':
        //             this.camera = 'rear'
        //             console.log(this.camera)
        //             break
        //         case 'rear':
        //             this.camera = 'front'
        //             console.log(this.camera)
        //             break
        //     }
        // }
    },
};
</script>
<style scoped lang="less">
.error {
    font-weight: bold;
    color: red;
}
.cameraMessage {
    width: 100%;
    height: 60px;
}
.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;
    /* height: 288px; */
    position: relative;
    background-color: #1110;

    /* background-color: #111; */
}
/* .qrcode-stream-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 82px;
  clear: both;
} */
/* .qrcode-stream-wrapper >>> .qrcode-stream-camera {
  width: 213px;
  height: 210px;
  clear: both;
  margin-top: 39px;
} */
.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 .txt {
    width: 100%;
    height: 35px;
    line-height: 35px;
    font-size: 14px;
    text-align: center;
    /* color: #f9f9f9; */
    margin: 0 auto;
    position: absolute;
    top: 70%;
    left: 0;
}
.qr-scanner .myQrcode {
    text-align: center;
    color: #00ae10;
}
.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);
    }
}
/deep/.qrcode-stream-camera{
    height:100vh !important;
}
/deep/.van-image{
    position: fixed;
    z-index: 333333333333333;
    left: 0.3rem;
    top: 0.3rem;
    opacity: 0.6;
}
</style>