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src/api/category.js

@@ -125,6 +125,21 @@ export const category = {
   },
   // #endregion
 
+  /**
+   * POST /api/category/:id/image/generate
+   * Body (optional): { size?: 2 | 3 | 4 }
+   * → 200 { category: { id, fullHash, thumbW, thumbH, thumbHash, size, grid, articleCount } }
+   */
+  // #region POST /api/category/:id/image/generate — generateImage
+  generateImage(categoryId, { size } = {}) {
+    return http(`/api/category/${categoryId}/image/generate`, {
+      method: 'POST',
+      body: size != null ? { size } : undefined,
+    });
+  },
+  // #endregion
+
+
   /**
    * GET /api/category/export.zip → application/zip (binary download)
    * `kategorien.zip` = kategorien.csv (semicolon-separated, Windows-1252,

src/automats/categoryAutomat.js

@@ -401,6 +401,28 @@ const actions = {
     return res.category;
   },
 
+  /**
+   * Generate a mosaic image for a category from its articles and subcategories.
+   * @param {{ categoryId: number|string, size?: number }} param0
+   */
+  async generateCategoryImage({ categoryId, size } = {}) {
+    const res = await categoryApi.generateImage(categoryId, { size });
+    const { id, fullHash, thumbW, thumbH, thumbHash } = res.category;
+    const { categories } = categoryAutomat.state;
+    if (!categories) return res.category;
+    const key = String(id);
+    const nextCategories = {
+      ...categories,
+      [key]: { ...categories[key], fullHash, thumbW, thumbH, thumbHash },
+    };
+    categoryAutomat.setState({
+      categories: nextCategories,
+    });
+    refreshCategoryViewChildren(nextCategories);
+    return res.category;
+  },
+
+
   // ─── Local state patches ───────────────────────────────────────────────────
 
   /** Remove an article from all live category view lists (used after article deletion). */

src/components/tiles/CategoryTile.jsx

@@ -3,6 +3,8 @@ import Box from '@mui/material/Box';
 import Typography from '@mui/material/Typography';
 import IconButton from '@mui/material/IconButton';
 import Switch from '@mui/material/Switch';
+import CircularProgress from '@mui/material/CircularProgress';
+import GridViewIcon from '@mui/icons-material/GridView';
 import DragHandleIcon from '@mui/icons-material/DragHandle';
 import AccountTreeIcon from '@mui/icons-material/AccountTree';
 import SettingsIcon from '@mui/icons-material/Settings';
@@ -116,7 +118,17 @@ function TopBand({ onSettingsClick, settingsTab, terminalCount, onPlacementClick
 /**
  * Middle row (1/3): gray band — TextField or terminal toggle.
  */
-function MiddleBand({ settingsTab, nameInput, terminals, categoryPosterminalIds, onTerminalToggle, fullHash }) {
+function MiddleBand({
+  settingsTab,
+  nameInput,
+  terminals,
+  categoryPosterminalIds,
+  onTerminalToggle,
+  fullHash,
+  onPhotoUpload,
+  onPhotoMatrix,
+  generatingMatrix,
+}) {
   const isActionTab = settingsTab === -2 || settingsTab === -3 || settingsTab === -4;
   const fillSx = {
     width: '100%',
@@ -162,22 +174,131 @@ function MiddleBand({ settingsTab, nameInput, terminals, categoryPosterminalIds,
 
   // Show photo upload UI when on photo tab
   if (settingsTab === -2) {
+    if (fullHash) {
+      return (
+        <Box sx={fillSx}>
+          <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
+            <PhotoCameraIcon sx={{ fontSize: 20, color: 'text.secondary' }} />
+            <Typography
+              variant="caption"
+              noWrap
+              sx={{ maxWidth: 100, color: 'text.secondary' }}
+            >
+              Bild löschen
+            </Typography>
+          </Box>
+        </Box>
+      );
+    }
+
     return (
-      <Box sx={fillSx}>
-        <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
-          <PhotoCameraIcon sx={{ fontSize: 20, color: 'text.secondary' }} />
+      <Box
+        sx={{
+          width: '100%',
+          height: '100%',
+          display: 'flex',
+          bgcolor: 'grey.300',
+        }}
+      >
+        <Box
+          role="button"
+          tabIndex={0}
+          aria-label="Hochladen"
+          onClick={(e) => {
+            e.stopPropagation();
+            onPhotoUpload?.();
+          }}
+          onKeyDown={(e) => {
+            if (e.key === 'Enter' || e.key === ' ') {
+              e.preventDefault();
+              e.stopPropagation();
+              onPhotoUpload?.();
+            }
+          }}
+          sx={{
+            flex: 1,
+            height: '100%',
+            display: 'flex',
+            flexDirection: 'column',
+            alignItems: 'center',
+            justifyContent: 'center',
+            gap: 0.25,
+            cursor: 'pointer',
+            borderRight: '1px solid',
+            borderColor: 'grey.400',
+            userSelect: 'none',
+            transition: 'background-color 0.15s',
+            '&:hover': { bgcolor: 'grey.400' },
+            '&:active': { bgcolor: 'grey.500' },
+          }}
+        >
+          <PhotoCameraIcon sx={{ fontSize: 18, color: 'text.secondary' }} />
           <Typography
             variant="caption"
             noWrap
-            sx={{ maxWidth: 100, color: 'text.secondary' }}
+            sx={{
+              fontSize: '0.68rem',
+              fontWeight: 600,
+              color: 'text.secondary',
+              lineHeight: 1,
+            }}
           >
-            {fullHash ? 'Bild löschen' : 'Hochladen'}
+            Hochladen
+          </Typography>
+        </Box>
+        <Box
+          role="button"
+          tabIndex={0}
+          aria-label="Matrix"
+          onClick={(e) => {
+            e.stopPropagation();
+            onPhotoMatrix?.();
+          }}
+          onKeyDown={(e) => {
+            if (e.key === 'Enter' || e.key === ' ') {
+              e.preventDefault();
+              e.stopPropagation();
+              onPhotoMatrix?.();
+            }
+          }}
+          sx={{
+            flex: 1,
+            height: '100%',
+            display: 'flex',
+            flexDirection: 'column',
+            alignItems: 'center',
+            justifyContent: 'center',
+            gap: 0.25,
+            cursor: generatingMatrix ? 'wait' : 'pointer',
+            userSelect: 'none',
+            transition: 'background-color 0.15s',
+            '&:hover': { bgcolor: generatingMatrix ? undefined : 'grey.400' },
+            '&:active': { bgcolor: generatingMatrix ? undefined : 'grey.500' },
+          }}
+        >
+          {generatingMatrix ? (
+            <CircularProgress size={16} sx={{ color: 'text.secondary' }} />
+          ) : (
+            <GridViewIcon sx={{ fontSize: 18, color: 'text.secondary' }} />
+          )}
+          <Typography
+            variant="caption"
+            noWrap
+            sx={{
+              fontSize: '0.68rem',
+              fontWeight: 600,
+              color: 'text.secondary',
+              lineHeight: 1,
+            }}
+          >
+            Matrix
           </Typography>
         </Box>
       </Box>
     );
   }
 
+
   // Show category deletion UI when on delete tab
   if (settingsTab === -3) {
     return (
@@ -303,7 +424,15 @@ class CategoryBackdrop extends PureComponent {
  *               lower half = gray band with chevrons + delete
  */
 export class CategoryTile extends Component {
-  state = { settingsTab: -1 }; // -1 = rename, -2 = photo, -3 = delete, -4 = delete recursive, 0..n-1 = terminal index
+  state = { settingsTab: -1, generatingMatrix: false }; // -1 = rename, -2 = photo, -3 = delete, -4 = delete recursive, 0..n-1 = terminal index
+
+  componentDidMount() {
+    this._isMounted = true;
+  }
+
+  componentWillUnmount() {
+    this._isMounted = false;
+  }
 
   handleClick = () => {
     this.props.onClick?.();
@@ -338,14 +467,27 @@ export class CategoryTile extends Component {
     });
   };
 
+  handlePhotoMatrix = async (e) => {
+    e?.stopPropagation?.();
+    if (this.state.generatingMatrix) return;
+    const fn = this.props.onPhotoMatrix || this.props.onPhotoGenerate;
+    if (!fn) return;
+    this.setState({ generatingMatrix: true });
+    try {
+      await fn();
+    } finally {
+      if (this._isMounted) {
+        this.setState({ generatingMatrix: false });
+      }
+    }
+  };
+
   handleMiddleBandClick = () => {
     const { settingsTab } = this.state;
-    const { onPhotoUpload, onPhotoDelete, fullHash, onDelete, onDeleteRecursive } = this.props;
+    const { onPhotoDelete, fullHash, onDelete, onDeleteRecursive } = this.props;
     if (settingsTab === -2) {
       if (fullHash) {
         onPhotoDelete?.();
-      } else {
-        onPhotoUpload?.();
       }
     } else if (settingsTab === -3) {
       onDelete?.();
@@ -400,13 +542,15 @@ export class CategoryTile extends Component {
       onTerminalToggle,
       onPhotoUpload,
       onPhotoDelete,
+      onPhotoMatrix,
+      onPhotoGenerate,
       onPlacementClick,
       onOpen,
       onDelete,
       onDeleteRecursive,
       ...rest
     } = this.props;
-    const { settingsTab } = this.state;
+    const { settingsTab, generatingMatrix } = this.state;
 
     // Shared by both modes: the thumbnail backdrop.
     const backdrop = (
@@ -431,7 +575,7 @@ export class CategoryTile extends Component {
             left: 0,
             right: 0,
             cursor:
-              settingsTab === -2 || settingsTab === -3 || settingsTab === -4
+              (settingsTab === -2 && fullHash) || settingsTab === -3 || settingsTab === -4
                 ? 'pointer'
                 : 'default',
           }}
@@ -443,6 +587,9 @@ export class CategoryTile extends Component {
             categoryPosterminalIds={categoryPosterminalIds}
             onTerminalToggle={onTerminalToggle}
             fullHash={fullHash}
+            onPhotoUpload={onPhotoUpload}
+            onPhotoMatrix={this.handlePhotoMatrix}
+            generatingMatrix={generatingMatrix}
           />
         </Box>
         {/* Lower third: clickable in edit mode to open/navigate into category */}

src/routes/artikel/kategorien.jsx

@@ -363,6 +363,15 @@ class ArtikelKategorienPage extends PureComponent {
     }
   };
 
+  handleGenerateCategoryMatrix = async (cat) => {
+    try {
+      await categoryAutomat.actions.generateCategoryImage({ categoryId: cat.id });
+      enqueueSnackbar('Matrix-Bild erstellt.', { variant: 'success' });
+    } catch (err) {
+      notifyError(err);
+    }
+  };
+
   render() {
     const {
       companyId,
@@ -500,6 +509,7 @@ class ArtikelKategorienPage extends PureComponent {
                     void categoryAutomat.actions.deleteCategoryImage(item.id)
                       .catch(notifyError);
                   },
+                  onPhotoMatrix: () => this.handleGenerateCategoryMatrix(item),
                   onDelete: () => this.handleDeleteCategory(item),
                   onDeleteRecursive: () => this.handleDeleteCategoryRecursive(item),
                   nameInput: (