feat: add qrcode demo (#256)

src/components/ReQrcode/index.ts

@@ -0,0 +1,10 @@
+import { App } from "vue";
+import reQrcode from "./src/index";
+
+export const ReQrcode = Object.assign(reQrcode, {
+  install(app: App) {
+    app.component(reQrcode.name, reQrcode);
+  }
+});
+
+export default ReQrcode;

src/components/ReQrcode/src/index.scss

@@ -0,0 +1,8 @@
+.qrcode {
+  &--disabled {
+    background: rgba(255, 255, 255, 0.95);
+    & > div {
+      transform: translate(-50%, -50%);
+    }
+  }
+}

src/components/ReQrcode/src/index.tsx

@@ -0,0 +1,262 @@
+import {
+  ref,
+  unref,
+  watch,
+  nextTick,
+  computed,
+  PropType,
+  defineComponent
+} from "vue";
+import "./index.scss";
+import { isString } from "/@/utils/is";
+import { cloneDeep } from "lodash-unified";
+import { propTypes } from "/@/utils/propTypes";
+import { IconifyIconOffline } from "../../ReIcon";
+import QRCode, { QRCodeRenderersOptions } from "qrcode";
+
+interface QrcodeLogo {
+  src?: string;
+  logoSize?: number;
+  bgColor?: string;
+  borderSize?: number;
+  crossOrigin?: string;
+  borderRadius?: number;
+  logoRadius?: number;
+}
+
+const props = {
+  // img 或者 canvas,img不支持logo嵌套
+  tag: propTypes.string
+    .validate((v: string) => ["canvas", "img"].includes(v))
+    .def("canvas"),
+  // 二维码内容
+  text: {
+    type: [String, Array] as PropType<string | Recordable[]>,
+    default: null
+  },
+  // qrcode.js配置项
+  options: {
+    type: Object as PropType<QRCodeRenderersOptions>,
+    default: (): QRCodeRenderersOptions => ({})
+  },
+  // 宽度
+  width: propTypes.number.def(200),
+  // logo
+  logo: {
+    type: [String, Object] as PropType<Partial<QrcodeLogo> | string>,
+    default: (): QrcodeLogo | string => ""
+  },
+  // 是否过期
+  disabled: propTypes.bool.def(false),
+  // 过期提示内容
+  disabledText: propTypes.string.def("")
+};
+
+export default defineComponent({
+  name: "epTableProBar",
+  props,
+  emits: ["done", "click", "disabled-click"],
+  setup(props, { emit }) {
+    const { toCanvas, toDataURL } = QRCode;
+    const loading = ref(true);
+    const wrapRef = ref<Nullable<HTMLCanvasElement | HTMLImageElement>>(null);
+    const renderText = computed(() => String(props.text));
+    const wrapStyle = computed(() => {
+      return {
+        width: props.width + "px",
+        height: props.width + "px"
+      };
+    });
+    const initQrcode = async () => {
+      await nextTick();
+      const options = cloneDeep(props.options || {});
+      if (props.tag === "canvas") {
+        // 容错率，默认对内容少的二维码采用高容错率，内容多的二维码采用低容错率
+        options.errorCorrectionLevel =
+          options.errorCorrectionLevel ||
+          getErrorCorrectionLevel(unref(renderText));
+        const _width: number = await getOriginWidth(unref(renderText), options);
+        options.scale =
+          props.width === 0 ? undefined : (props.width / _width) * 4;
+        const canvasRef: HTMLCanvasElement = await toCanvas(
+          unref(wrapRef) as HTMLCanvasElement,
+          unref(renderText),
+          options
+        );
+        if (props.logo) {
+          const url = await createLogoCode(canvasRef);
+          emit("done", url);
+          loading.value = false;
+        } else {
+          emit("done", canvasRef.toDataURL());
+          loading.value = false;
+        }
+      } else {
+        const url = await toDataURL(renderText.value, {
+          errorCorrectionLevel: "H",
+          width: props.width,
+          ...options
+        });
+        (unref(wrapRef) as HTMLImageElement).src = url;
+        emit("done", url);
+        loading.value = false;
+      }
+    };
+    watch(
+      () => renderText.value,
+      val => {
+        if (!val) return;
+        initQrcode();
+      },
+      {
+        deep: true,
+        immediate: true
+      }
+    );
+    const createLogoCode = (canvasRef: HTMLCanvasElement) => {
+      const canvasWidth = canvasRef.width;
+      const logoOptions: QrcodeLogo = Object.assign(
+        {
+          logoSize: 0.15,
+          bgColor: "#ffffff",
+          borderSize: 0.05,
+          crossOrigin: "anonymous",
+          borderRadius: 8,
+          logoRadius: 0
+        },
+        isString(props.logo) ? {} : props.logo
+      );
+      const {
+        logoSize = 0.15,
+        bgColor = "#ffffff",
+        borderSize = 0.05,
+        crossOrigin = "anonymous",
+        borderRadius = 8,
+        logoRadius = 0
+      } = logoOptions;
+      const logoSrc = isString(props.logo) ? props.logo : props.logo.src;
+      const logoWidth = canvasWidth * logoSize;
+      const logoXY = (canvasWidth * (1 - logoSize)) / 2;
+      const logoBgWidth = canvasWidth * (logoSize + borderSize);
+      const logoBgXY = (canvasWidth * (1 - logoSize - borderSize)) / 2;
+      const ctx = canvasRef.getContext("2d");
+      if (!ctx) return;
+      // logo 底色
+      canvasRoundRect(ctx)(
+        logoBgXY,
+        logoBgXY,
+        logoBgWidth,
+        logoBgWidth,
+        borderRadius
+      );
+      ctx.fillStyle = bgColor;
+      ctx.fill();
+      // logo
+      const image = new Image();
+      if (crossOrigin || logoRadius) {
+        image.setAttribute("crossOrigin", crossOrigin);
+      }
+      (image as any).src = logoSrc;
+      // 使用image绘制可以避免某些跨域情况
+      const drawLogoWithImage = (image: HTMLImageElement) => {
+        ctx.drawImage(image, logoXY, logoXY, logoWidth, logoWidth);
+      };
+      // 使用canvas绘制以获得更多的功能
+      const drawLogoWithCanvas = (image: HTMLImageElement) => {
+        const canvasImage = document.createElement("canvas");
+        canvasImage.width = logoXY + logoWidth;
+        canvasImage.height = logoXY + logoWidth;
+        const imageCanvas = canvasImage.getContext("2d");
+        if (!imageCanvas || !ctx) return;
+        imageCanvas.drawImage(image, logoXY, logoXY, logoWidth, logoWidth);
+        canvasRoundRect(ctx)(logoXY, logoXY, logoWidth, logoWidth, logoRadius);
+        if (!ctx) return;
+        const fillStyle = ctx.createPattern(canvasImage, "no-repeat");
+        if (fillStyle) {
+          ctx.fillStyle = fillStyle;
+          ctx.fill();
+        }
+      };
+      // 将 logo绘制到 canvas上
+      return new Promise((resolve: any) => {
+        image.onload = () => {
+          logoRadius ? drawLogoWithCanvas(image) : drawLogoWithImage(image);
+          resolve(canvasRef.toDataURL());
+        };
+      });
+    };
+    // 得到原QrCode的大小，以便缩放得到正确的QrCode大小
+    const getOriginWidth = async (
+      content: string,
+      options: QRCodeRenderersOptions
+    ) => {
+      const _canvas = document.createElement("canvas");
+      await toCanvas(_canvas, content, options);
+      return _canvas.width;
+    };
+    // 对于内容少的QrCode，增大容错率
+    const getErrorCorrectionLevel = (content: string) => {
+      if (content.length > 36) {
+        return "M";
+      } else if (content.length > 16) {
+        return "Q";
+      } else {
+        return "H";
+      }
+    };
+    // 用于绘制圆角
+    const canvasRoundRect = (ctx: CanvasRenderingContext2D) => {
+      return (x: number, y: number, w: number, h: number, r: number) => {
+        const minSize = Math.min(w, h);
+        if (r > minSize / 2) {
+          r = minSize / 2;
+        }
+        ctx.beginPath();
+        ctx.moveTo(x + r, y);
+        ctx.arcTo(x + w, y, x + w, y + h, r);
+        ctx.arcTo(x + w, y + h, x, y + h, r);
+        ctx.arcTo(x, y + h, x, y, r);
+        ctx.arcTo(x, y, x + w, y, r);
+        ctx.closePath();
+        return ctx;
+      };
+    };
+    const clickCode = () => {
+      emit("click");
+    };
+    const disabledClick = () => {
+      emit("disabled-click");
+    };
+    return () => (
+      <>
+        <div
+          v-loading={unref(loading)}
+          class="qrcode relative inline-block"
+          style={unref(wrapStyle)}
+        >
+          {props.tag === "canvas" ? (
+            <canvas ref={wrapRef} onClick={clickCode}></canvas>
+          ) : (
+            <img ref={wrapRef} onClick={clickCode}></img>
+          )}
+          {props.disabled && (
+            <div
+              class="qrcode--disabled absolute top-0 left-0 flex w-full h-full items-center justify-center"
+              onClick={disabledClick}
+            >
+              <div class="absolute top-[50%] left-[50%] font-bold">
+                <IconifyIconOffline
+                  class="cursor-pointer outline-none"
+                  icon="refresh-right"
+                  width="30"
+                  color="var(--el-color-primary)"
+                />
+                <div>{props.disabledText}</div>
+              </div>
+            </div>
+          )}
+        </div>
+      </>
+    );
+  }
+});