update

frontend/src/components/chat/FileMessageContent.tsx

@@ -1,10 +1,13 @@
-import React from 'react';
+import React, { useState } from 'react';
 import Box from '@mui/material/Box';
 import Typography from '@mui/material/Typography';
 import IconButton from '@mui/material/IconButton';
 import Tooltip from '@mui/material/Tooltip';
+import Dialog from '@mui/material/Dialog';
+import DialogContent from '@mui/material/DialogContent';
 import InsertDriveFileIcon from '@mui/icons-material/InsertDriveFile';
 import DownloadIcon from '@mui/icons-material/Download';
+import CloseIcon from '@mui/icons-material/Close';
 
 interface FileParam {
   name: string;
@@ -40,7 +43,67 @@ function extractFileParams(messageParameters: Record<string, any>): FileParam[]
   return files;
 }
 
+interface ImageLightboxProps {
+  open: boolean;
+  onClose: () => void;
+  previewUrl: string;
+  downloadUrl: string;
+  name: string;
+}
+
+const ImageLightbox: React.FC<ImageLightboxProps> = ({ open, onClose, previewUrl, downloadUrl, name }) => (
+  <Dialog
+    open={open}
+    onClose={onClose}
+    maxWidth="lg"
+    fullWidth
+    slotProps={{ paper: { sx: { bgcolor: 'black', m: 1 } } }}
+  >
+    <DialogContent sx={{ p: 0, position: 'relative', display: 'flex', justifyContent: 'center', alignItems: 'center', minHeight: 200 }}>
+      <Box
+        component="img"
+        src={previewUrl}
+        alt={name}
+        sx={{ maxWidth: '100%', maxHeight: '85vh', display: 'block', objectFit: 'contain' }}
+      />
+      {/* Close button */}
+      <Tooltip title="Schließen">
+        <IconButton
+          onClick={onClose}
+          size="small"
+          sx={{ position: 'absolute', top: 8, right: 8, bgcolor: 'rgba(0,0,0,0.5)', color: 'white', '&:hover': { bgcolor: 'rgba(0,0,0,0.75)' } }}
+        >
+          <CloseIcon fontSize="small" />
+        </IconButton>
+      </Tooltip>
+      {/* Download button */}
+      <Tooltip title="Herunterladen">
+        <IconButton
+          component="a"
+          href={downloadUrl}
+          download={name}
+          target="_blank"
+          rel="noopener noreferrer"
+          size="small"
+          sx={{ position: 'absolute', top: 8, right: 44, bgcolor: 'rgba(0,0,0,0.5)', color: 'white', '&:hover': { bgcolor: 'rgba(0,0,0,0.75)' } }}
+        >
+          <DownloadIcon fontSize="small" />
+        </IconButton>
+      </Tooltip>
+      {/* Filename */}
+      <Typography
+        variant="caption"
+        sx={{ position: 'absolute', bottom: 8, left: 0, right: 0, textAlign: 'center', color: 'rgba(255,255,255,0.7)', px: 2 }}
+        noWrap
+      >
+        {name}
+      </Typography>
+    </DialogContent>
+  </Dialog>
+);
+
 const FileMessageContent: React.FC<FileMessageContentProps> = ({ messageParameters, isOwnMessage }) => {
+  const [lightboxFile, setLightboxFile] = useState<FileParam | null>(null);
   const files = extractFileParams(messageParameters);
   if (files.length === 0) return null;
 
@@ -48,30 +111,45 @@ const FileMessageContent: React.FC<FileMessageContentProps> = ({ messageParamete
     <>
       {files.map((file, idx) => {
         const downloadUrl = `/api/nextcloud/talk/files/${file.id}/download${file.path ? `?path=${encodeURIComponent(file.path)}` : ''}`;
-        const previewUrl = `/api/nextcloud/talk/files/${file.id}/preview?w=400&h=400`;
+        const thumbUrl = `/api/nextcloud/talk/files/${file.id}/preview?w=400&h=400`;
+        const fullUrl = `/api/nextcloud/talk/files/${file.id}/preview?w=1200&h=1200`;
         const isImage = file.mimetype?.startsWith('image/') && file.previewAvailable === 'yes';
 
         if (isImage) {
           return (
             <Box key={idx} sx={{ mt: 0.5 }}>
-              <a href={downloadUrl} target="_blank" rel="noopener noreferrer" download={file.name}>
               <Box
                 component="img"
-                  src={previewUrl}
+                src={thumbUrl}
                 alt={file.name}
+                onClick={() => setLightboxFile(file)}
                 sx={{
                   maxWidth: '100%',
                   maxHeight: 200,
                   borderRadius: 1,
                   display: 'block',
-                    cursor: 'pointer',
+                  cursor: 'zoom-in',
                   '&:hover': { opacity: 0.9 },
                 }}
               />
-              </a>
+              <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', mt: 0.25 }}>
-              <Typography variant="caption" sx={{ opacity: 0.7, fontSize: '0.7rem' }}>
+                <Typography variant="caption" sx={{ opacity: 0.7, fontSize: '0.7rem' }} noWrap>
                   {file.name}
                 </Typography>
+                <Tooltip title="Herunterladen">
+                  <IconButton
+                    size="small"
+                    component="a"
+                    href={downloadUrl}
+                    download={file.name}
+                    target="_blank"
+                    rel="noopener noreferrer"
+                    sx={{ color: 'inherit', p: 0.25, flexShrink: 0 }}
+                  >
+                    <DownloadIcon sx={{ fontSize: '0.9rem' }} />
+                  </IconButton>
+                </Tooltip>
+              </Box>
             </Box>
           );
         }
@@ -93,12 +171,7 @@ const FileMessageContent: React.FC<FileMessageContentProps> = ({ messageParamete
           >
             <InsertDriveFileIcon fontSize="small" sx={{ opacity: 0.8, flexShrink: 0 }} />
             <Box sx={{ flex: 1, minWidth: 0 }}>
-              <Typography
+              <Typography variant="body2" noWrap title={file.name} sx={{ fontWeight: 500, lineHeight: 1.2 }}>
-                variant="body2"
-                noWrap
-                title={file.name}
-                sx={{ fontWeight: 500, lineHeight: 1.2 }}
-              >
                 {file.name}
               </Typography>
               {file.size && (
@@ -123,6 +196,16 @@ const FileMessageContent: React.FC<FileMessageContentProps> = ({ messageParamete
           </Box>
         );
       })}
+
+      {lightboxFile && (
+        <ImageLightbox
+          open
+          onClose={() => setLightboxFile(null)}
+          previewUrl={`/api/nextcloud/talk/files/${lightboxFile.id}/preview?w=1200&h=1200`}
+          downloadUrl={`/api/nextcloud/talk/files/${lightboxFile.id}/download${lightboxFile.path ? `?path=${encodeURIComponent(lightboxFile.path)}` : ''}`}
+          name={lightboxFile.name}
+        />
+      )}
     </>
   );
 };