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fix: enable drag-and-drop for lab report uploads #32

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fix: enable drag-and-drop for lab report uploads #32

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33 changes: 30 additions & 3 deletions frontend/src/pages/LabReportAnalysisPage.jsx
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ const LabReportAnalysisPage = () => {
const [uploading, setUploading] = useState(false);
const [error, setError] = useState('');
const [result, setResult] = useState(null);
const [isDragging, setIsDragging] = useState(false);
const fileInputRef = useRef(null);
const { data: past, error: pastError } = useAsync(getLabReports, [result]);
const pastReports = (!pastError && past?.reports) || [];
Expand All @@ -49,8 +50,7 @@ const LabReportAnalysisPage = () => {

const pickFile = () => fileInputRef.current?.click();

const onFile = (e) => {
const f = e.target.files?.[0];
const acceptFile = (f) => {
if (!f) return;
const msg = validate(f);
if (msg) {
Expand All @@ -62,6 +62,30 @@ const LabReportAnalysisPage = () => {
setResult(null);
};

const onFile = (e) => {
acceptFile(e.target.files?.[0]);
// Permit choosing the same file again after removing it or fixing validation.
e.target.value = '';
};

const handleDragOver = (e) => {
e.preventDefault();
e.dataTransfer.dropEffect = 'copy';
setIsDragging(true);
};

const handleDragLeave = (e) => {
// Avoid flicker while the pointer moves between children of the dropzone.
if (e.currentTarget.contains(e.relatedTarget)) return;
setIsDragging(false);
};

const handleDrop = (e) => {
e.preventDefault();
setIsDragging(false);
acceptFile(e.dataTransfer.files?.[0]);
};

const onUpload = async () => {
if (!file) return;
setUploading(true);
Expand Down Expand Up @@ -100,7 +124,10 @@ const LabReportAnalysisPage = () => {
tabIndex={file ? undefined : 0}
aria-label={file ? undefined : 'Choose a lab report file (JPG, PNG or PDF, max 10 MB)'}
onKeyDown={file ? undefined : (e) => activateOnEnterOrSpace(e, pickFile)}
className="dash-inset-dashed flex-1 min-h-[280px] p-8 flex flex-col items-center justify-center text-center cursor-pointer hover:bg-slate-50/80 dark:hover:bg-slate-800/40 transition-colors"
className={`dash-inset-dashed flex-1 min-h-[280px] p-8 flex flex-col items-center justify-center text-center cursor-pointer hover:bg-slate-50/80 dark:hover:bg-slate-800/40 transition-colors ${isDragging ? 'border-teal bg-teal/10' : ''}`}
onDragOver={handleDragOver}
onDragLeave={handleDragLeave}
onDrop={handleDrop}
onClick={pickFile}
>
<input
Expand Down