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[Feat]: file attachments support for chat component #1893

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d318b7e
add file attachments support for chat component
iamfaran Jul 23, 2025
68d4f84
fix current message update text
iamfaran Jul 24, 2025
a01bb75
optimize history
iamfaran Jul 24, 2025
a2160b9
improve attachment logic
iamfaran Jul 24, 2025
c845adc
replace shadcn dialog with antD modal
iamfaran Jul 25, 2025
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improve attachment logic
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@iamfaran
iamfaran committed Jul 24, 2025
commit a2160b99fb68178220a432cccd52b8d96fb60804
99 changes: 51 additions & 48 deletions client/packages/lowcoder/src/comps/comps/chatComp/components/ui/attachment.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -144,73 +144,76 @@ const ScreenReaderOnly = styled.span`
overflow: hidden;
`;

// ============================================================================
// UTILITY HOOKS
// ============================================================================


const useFileSrc = (file: File | undefined) => {
const [src, setSrc] = useState<string | undefined>();
const lastFileRef = useRef<File>();

useEffect(() => {
if (!file || file === lastFileRef.current) return;

const objectUrl = URL.createObjectURL(file);
setSrc(objectUrl);
lastFileRef.current = file;

return () => {
URL.revokeObjectURL(objectUrl);
};
}, [file]);

return src;
};



const useAttachmentSrc = () => {
// Listen only to image-type attachments
const attachment = useAttachment(
useCallback((a: any) => {
if (a.type !== "image") return undefined;
return a;
}, [])
useCallback((a: any) => (a.type === "image" ? a : undefined), [])
);

const [src, setSrc] = useState<string | undefined>();
const lastAttachmentRef = useRef<any>();

useEffect(() => {
if (!attachment || attachment === lastAttachmentRef.current) return;
// Keep track of the last generated object URL so that we can revoke it
const objectUrlRef = useRef<string | undefined>();
const lastAttachmentIdRef = useRef<string | undefined>();

// Handle new/pending attachments with File objects
if (attachment.file && attachment.file instanceof File) {
const objectUrl = URL.createObjectURL(attachment.file);
setSrc(objectUrl);
lastAttachmentRef.current = attachment;
useEffect(() => {
// If the same attachment is rendered again, do nothing
if (!attachment || attachment.id === lastAttachmentIdRef.current) return;

// Clean up any previous object URL
if (objectUrlRef.current) {
try {
URL.revokeObjectURL(objectUrlRef.current);
} catch {
/* ignore */
}
objectUrlRef.current = undefined;
}

return () => {
URL.revokeObjectURL(objectUrl);
};
// ------------------------------------------------------------------
// 1. New (local) File object – generate a temporary ObjectURL
// ------------------------------------------------------------------
if (attachment.file instanceof File) {
const url = URL.createObjectURL(attachment.file);
objectUrlRef.current = url;
setSrc(url);
lastAttachmentIdRef.current = attachment.id;
return;
}

// Handle saved attachments with base64 data
const imageContent = attachment.content?.find((c: any) => c.type === "image");
if (imageContent?.image) {
setSrc(imageContent.image);
lastAttachmentRef.current = attachment;
// ------------------------------------------------------------------
// 2. Restored attachment coming from storage – use stored base64 image
// ------------------------------------------------------------------
const imgPart = attachment.content?.find((p: any) => p.type === "image");
if (imgPart?.image) {
setSrc(imgPart.image as string);
lastAttachmentIdRef.current = attachment.id;
return;
}

// If no valid source found, clear the src
// ------------------------------------------------------------------
// 3. No usable preview – clear src
// ------------------------------------------------------------------
setSrc(undefined);
lastAttachmentRef.current = attachment;
lastAttachmentIdRef.current = attachment.id;
}, [attachment]);

/* Cleanup when the component using this hook unmounts */
useEffect(() => {
return () => {
if (objectUrlRef.current) {
try {
URL.revokeObjectURL(objectUrlRef.current);
} catch {
/* ignore */
}
}
};
}, []);

return src;
};

// ============================================================================
// ATTACHMENT COMPONENTS
// ============================================================================
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