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import { cn } from "cn"; import { Slot as SlotPrimitive } from "radix-ui"; import * as React from "react"; import { useComposedRefs } from "@/lib/compose-refs"; import { useLazyRef } from "@/registry/bases/radix/hooks/use-lazy-ref"; const ROOT_NAME = "QRCode"; const CANVAS_NAME = "QRCodeCanvas"; const SVG_NAME = "QRCodeSvg"; const IMAGE_NAME = "QRCodeImage"; const SKELETON_NAME = "QRCodeSkeleton"; type QRCodeLevel = "L" | "M" | "Q" | "H"; interface QRCodeCanvasOpts { errorCorrectionLevel: QRCodeLevel; type?: "image/png" | "image/jpeg" | "image/webp"; quality?: number; margin?: number; color?: { dark: string; light: string; }; width?: number; rendererOpts?: { quality?: number; }; } interface StoreState { dataUrl: string | null; svgString: string | null; isGenerating: boolean; error: Error | null; generationKey: string; } interface Store { subscribe: (callback: () => void) => () => void; getState: () => StoreState; setState: (key: K, value: StoreState[K]) => void; setStates: (updates: Partial) => void; notify: () => void; } interface QRCodeContextValue { value: string; size: number; margin: number; level: QRCodeLevel; backgroundColor: string; foregroundColor: string; canvasRef: React.RefObject; } const StoreContext = React.createContext(null); function useStore(selector: (state: StoreState) => T): T { const store = React.useContext(StoreContext); if (!store) { throw new Error(`\`useQRCode\` must be used within \`${ROOT_NAME}\``); } const getSnapshot = React.useCallback( () => selector(store.getState()), [store, selector], ); return React.useSyncExternalStore(store.subscribe, getSnapshot, getSnapshot); } const QRCodeContext = React.createContext(null); function useQRCodeContext(consumerName: string) { const context = React.useContext(QRCodeContext); if (!context) { throw new Error(`\`${consumerName}\` must be used within \`${ROOT_NAME}\``); } return context; } interface QRCodeProps extends Omit, "onError"> { value: string; size?: number; level?: QRCodeLevel; margin?: number; quality?: number; backgroundColor?: string; foregroundColor?: string; onError?: (error: Error) => void; onGenerated?: () => void; asChild?: boolean; } function QRCode(props: QRCodeProps) { const { value, size = 200, level = "M", margin = 1, quality = 0.92, backgroundColor = "#ffffff", foregroundColor = "#000000", onError, onGenerated, className, style, asChild, ...rootProps } = props; const canvasRef = React.useRef(null); const listenersRef = useLazyRef(() => new Set<() => void>()); const stateRef = useLazyRef(() => ({ dataUrl: null, svgString: null, isGenerating: false, error: null, generationKey: "", })); const store = React.useMemo(() => { return { subscribe: (cb) => { listenersRef.current.add(cb); return () => listenersRef.current.delete(cb); }, getState: () => stateRef.current, setState: (key, value) => { if (Object.is(stateRef.current[key], value)) return; stateRef.current[key] = value; store.notify(); }, setStates: (updates) => { let hasChanged = false; for (const key of Object.keys(updates) as Array) { const value = updates[key]; if (value !== undefined && !Object.is(stateRef.current[key], value)) { Object.assign(stateRef.current, { [key]: value }); hasChanged = true; } } if (hasChanged) { store.notify(); } }, notify: () => { for (const cb of listenersRef.current) { cb(); } }, }; }, [listenersRef, stateRef]); const canvasOpts = React.useMemo( () => ({ errorCorrectionLevel: level, type: "image/png", quality, margin, color: { dark: foregroundColor, light: backgroundColor, }, width: size, }), [level, margin, foregroundColor, backgroundColor, size, quality], ); const generationKey = React.useMemo(() => { if (!value) return ""; return JSON.stringify({ value, size, level, margin, quality, foregroundColor, backgroundColor, }); }, [value, level, margin, foregroundColor, backgroundColor, size, quality]); const onQRCodeGenerate = React.useCallback( async (targetGenerationKey: string) => { if (!value || !targetGenerationKey) return; const currentState = store.getState(); if ( currentState.isGenerating || currentState.generationKey === targetGenerationKey ) return; store.setStates({ isGenerating: true, error: null, }); try { const QRCode = (await import("qrcode")).default; let dataUrl: string | null = null; try { dataUrl = await QRCode.toDataURL(value, canvasOpts); } catch { dataUrl = null; } if (canvasRef.current) { await QRCode.toCanvas(canvasRef.current, value, canvasOpts); } const svgString = await QRCode.toString(value, { errorCorrectionLevel: canvasOpts.errorCorrectionLevel, margin: canvasOpts.margin, color: canvasOpts.color, width: canvasOpts.width, type: "svg", }); store.setStates({ dataUrl, svgString, isGenerating: false, generationKey: targetGenerationKey, }); onGenerated?.(); } catch (error) { const parsedError = error instanceof Error ? error : new Error("Failed to generate QR code"); store.setStates({ error: parsedError, isGenerating: false, }); onError?.(parsedError); } }, [value, canvasOpts, store, onError, onGenerated], ); const contextValue = React.useMemo( () => ({ value, size, level, margin, backgroundColor, foregroundColor, canvasRef, }), [value, size, backgroundColor, foregroundColor, level, margin], ); React.useLayoutEffect(() => { if (generationKey) { const rafId = requestAnimationFrame(() => { onQRCodeGenerate(generationKey); }); return () => cancelAnimationFrame(rafId); } }, [generationKey, onQRCodeGenerate]); const RootPrimitive = asChild ? SlotPrimitive.Slot : "div"; return ( ); } interface QRCodeCanvasProps extends React.ComponentProps<"canvas"> { asChild?: boolean; } function QRCodeCanvas(props: QRCodeCanvasProps) { const { asChild, className, ref, ...canvasProps } = props; const context = useQRCodeContext(CANVAS_NAME); const generationKey = useStore((state) => state.generationKey); const composedRef = useComposedRefs(ref, context.canvasRef); const CanvasPrimitive = asChild ? SlotPrimitive.Slot : "canvas"; return ( ); } interface QRCodeSvgProps extends React.ComponentProps<"div"> { asChild?: boolean; } function QRCodeSvg(props: QRCodeSvgProps) { const { asChild, className, style, ...svgProps } = props; const context = useQRCodeContext(SVG_NAME); const svgString = useStore((state) => state.svgString); if (!svgString) return null; const SvgPrimitive = asChild ? SlotPrimitive.Slot : "div"; return ( ); } interface QRCodeImageProps extends React.ComponentProps<"img"> { asChild?: boolean; } function QRCodeImage(props: QRCodeImageProps) { const { alt = "QR Code", asChild, className, ...imageProps } = props; const context = useQRCodeContext(IMAGE_NAME); const dataUrl = useStore((state) => state.dataUrl); if (!dataUrl) return null; const ImagePrimitive = asChild ? SlotPrimitive.Slot : "img"; return ( ); } interface QRCodeDownloadProps extends React.ComponentProps<"button"> { filename?: string; format?: "png" | "svg"; asChild?: boolean; } function QRCodeDownload(props: QRCodeDownloadProps) { const { filename = "qrcode", format = "png", asChild, className, children, ...buttonProps } = props; const dataUrl = useStore((state) => state.dataUrl); const svgString = useStore((state) => state.svgString); const onClick = React.useCallback( (event: React.MouseEvent) => { buttonProps.onClick?.(event); if (event.defaultPrevented) return; const link = document.createElement("a"); if (format === "png" && dataUrl) { link.href = dataUrl; link.download = `${filename}.png`; } else if (format === "svg" && svgString) { const blob = new Blob([svgString], { type: "image/svg+xml" }); link.href = URL.createObjectURL(blob); link.download = `${filename}.svg`; } else { return; } document.body.appendChild(link); link.click(); document.body.removeChild(link); if (format === "svg" && svgString) { URL.revokeObjectURL(link.href); } }, [dataUrl, svgString, filename, format, buttonProps.onClick], ); const ButtonPrimitive = asChild ? 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