Fix zoom resizing, add multi page support, fix text box bugs, fix broken upload button

frontend/src/features/editor/canvas/AnnotationLayer.tsx

@@ -21,6 +21,11 @@ export function AnnotationLayer({ pageNumber, width, height, viewportParams }: A
 
   const annotations = useEditorStore(state => state.annotations);
 
+  const latestViewportParams = useRef(viewportParams);
+  useEffect(() => {
+    latestViewportParams.current = viewportParams;
+  }, [viewportParams]);
+
   // Initial setup and event binding
   useEffect(() => {
     if (!canvasRef.current) return;
@@ -40,14 +45,15 @@ export function AnnotationLayer({ pageNumber, width, height, viewportParams }: A
         // Find existing annotation
         const ann = useEditorStore.getState().annotations.find(a => a.id === obj.id);
         if (ann) {
-          const pt = screenToPdf({ x: obj.left, y: obj.top }, viewportParams);
+          const currentVp = latestViewportParams.current;
+          const pt = screenToPdf({ x: obj.left, y: obj.top }, currentVp);
           
           const scaleX = obj.scaleX || 1;
           const scaleY = obj.scaleY || 1;
           
           // Box width/height in PDF space
-          const newWidth = (obj.width * scaleX) / (viewportParams.scale * (viewportParams.dpr || 1));
-          const newHeight = (obj.height * scaleY) / (viewportParams.scale * (viewportParams.dpr || 1));
+          const newWidth = (obj.width * scaleX) / (currentVp.scale * (currentVp.dpr || 1));
+          const newHeight = (obj.height * scaleY) / (currentVp.scale * (currentVp.dpr || 1));
           
           useEditorStore.getState().updateAnnotation(obj.id, {
             rect: { ...ann.rect, x: pt.x, y: pt.y, width: newWidth, height: newHeight }
@@ -106,25 +112,30 @@ export function AnnotationLayer({ pageNumber, width, height, viewportParams }: A
     };
   }, []); // Run once on mount
 
+  const prevScaleRef = useRef(viewportParams.scale);
+
   // Handle dimensions and re-rendering annotations
   useEffect(() => {
     if (!fabricRef.current) return;
     const canvas = fabricRef.current;
     canvas.setDimensions({ width, height });
     
-    // Simple naive sync: clear and re-render everything
     const activeObj = canvas.getActiveObject() as any;
     const activeId = activeObj?.id;
 
     const pageAnns = annotations.filter(a => a.page === pageNumber);
     const annIds = new Set(pageAnns.map(a => a.id));
 
-    // Remove objects that are no longer in annotations
-    canvas.getObjects().forEach((obj: any) => {
-      // Don't remove the active object unless it was deleted from the store
-      if (obj.id === activeId && annIds.has(activeId)) return;
+    const scaleChanged = prevScaleRef.current !== viewportParams.scale;
+    prevScaleRef.current = viewportParams.scale;
 
-      if (!annIds.has(obj.id)) {
+    // Remove objects that are no longer in annotations, OR if the zoom scale changed
+    canvas.getObjects().forEach((obj: any) => {
+      // Don't remove the active object unless it was deleted from the store, 
+      // UNLESS the scale changed (we must recreate everything on zoom)
+      if (!scaleChanged && obj.id === activeId && annIds.has(activeId)) return;
+      
+      if (scaleChanged || !annIds.has(obj.id)) {
         canvas.remove(obj);
       }
     });
@@ -132,7 +143,7 @@ export function AnnotationLayer({ pageNumber, width, height, viewportParams }: A
     // Add missing annotations
     const canvasObjIds = new Set(canvas.getObjects().map((o: any) => o.id));
     pageAnns.forEach(ann => {
-      if (ann.id === activeId) return; // Skip rendering the active object
+      if (!scaleChanged && ann.id === activeId) return; // Skip rendering the active object
       
       if (!canvasObjIds.has(ann.id)) {
         const tool = getTool(ann.type);
@@ -141,7 +152,14 @@ export function AnnotationLayer({ pageNumber, width, height, viewportParams }: A
         }
       }
     });
-  }, [width, height, annotations, pageNumber]); // We ignore viewportParams identity for now to avoid loops
+
+    if (scaleChanged && activeId && annIds.has(activeId)) {
+       const newlyRenderedActiveObj = canvas.getObjects().find((o: any) => o.id === activeId);
+       if (newlyRenderedActiveObj) {
+          canvas.setActiveObject(newlyRenderedActiveObj);
+       }
+    }
+  }, [width, height, annotations, pageNumber, viewportParams.scale]);
 
   // Handle tool activation/deactivation and event binding
   useEffect(() => {
@@ -162,16 +180,16 @@ export function AnnotationLayer({ pageNumber, width, height, viewportParams }: A
       if (tool.onActivate) tool.onActivate(canvas);
       
       if (tool.onPointerDown) {
-        canvas.on('mouse:down', (e) => tool.onPointerDown!(e, canvas, viewportParams, pageNumber));
+        canvas.on('mouse:down', (e) => tool.onPointerDown!(e, canvas, latestViewportParams.current, pageNumber));
       }
       if (tool.onPointerMove) {
-        canvas.on('mouse:move', (e) => tool.onPointerMove!(e, canvas, viewportParams, pageNumber));
+        canvas.on('mouse:move', (e) => tool.onPointerMove!(e, canvas, latestViewportParams.current, pageNumber));
       }
       if (tool.onPointerUp) {
-        canvas.on('mouse:up', (e) => tool.onPointerUp!(e, canvas, viewportParams, pageNumber));
+        canvas.on('mouse:up', (e) => tool.onPointerUp!(e, canvas, latestViewportParams.current, pageNumber));
       }
       if (tool.onPathCreated) {
-        canvas.on('path:created', (e) => tool.onPathCreated!(e, canvas, viewportParams, pageNumber));
+        canvas.on('path:created', (e) => tool.onPathCreated!(e, canvas, latestViewportParams.current, pageNumber));
       }
     }
 

frontend/src/features/editor/toolbar/TextFormatToolbar.tsx

@@ -53,21 +53,71 @@ export function TextFormatToolbar({ annotationId, viewportParams }: TextFormatTo
 
   const applyStyle = (styleName: string, value: any, globalPropName: keyof TextProps, globalValue?: any) => {
     const canvas = (window as any).__fabricCanvas as any;
-    let didInline = false;
     
     if (canvas) {
       const activeObj = canvas.getActiveObject();
       if (activeObj && activeObj.id === annotationId) {
+        const isStructural = styleName === 'fontSize' || styleName === 'fontFamily';
+        
+        if (isStructural) {
+          // Structural properties MUST be applied to the base object. Fabric 7's bounding box calculations
+          // frequently fail when inline styles are used for size/font.
+          activeObj.set(styleName, value);
+          
+          // Obliterate any inline styles for this property so the base property strictly applies to all text
+          if (activeObj.styles) {
+            for (const line in activeObj.styles) {
+              for (const char in activeObj.styles[line]) {
+                if (activeObj.styles[line][char]) {
+                  delete activeObj.styles[line][char][styleName];
+                }
+              }
+            }
+          }
+          
+          // If the box is empty and we are currently editing it, Fabric's invisible cursor
+          // cache will still stubbornly hold the old size unless we violently wipe it.
+          if (activeObj.isEditing && !activeObj.text) {
+             activeObj.styles = {};
+             if (activeObj.hiddenTextarea) {
+               if (styleName === 'fontSize') activeObj.hiddenTextarea.style.fontSize = `${value}px`;
+               if (styleName === 'fontFamily') activeObj.hiddenTextarea.style.fontFamily = value;
+             }
+          }
+        } else {
+          // Cosmetic properties (bold, italic, color) work fine with inline styles
           if (activeObj.isEditing) {
-          if (activeObj.selectionStart !== activeObj.selectionEnd) {
             activeObj.setSelectionStyles({ [styleName]: value });
-            didInline = true;
-          } else {
+            if (!activeObj.text) {
                activeObj.set(styleName, value);
             }
           } else {
+            // If NOT editing, they selected the whole box. Update the base property.
             activeObj.set(styleName, value);
+            
+            // Clear any inline styles for this property so the base property actually takes effect!
+            if (activeObj.styles) {
+              for (const line in activeObj.styles) {
+                for (const char in activeObj.styles[line]) {
+                  if (activeObj.styles[line][char]) {
+                    delete activeObj.styles[line][char][styleName];
                   }
+                }
+              }
+            }
+          }
+        }
+        
+        // Critical: Fabric 7 heavily caches text. We MUST mark it dirty to force a redraw!
+        activeObj.dirty = true;
+        if ((activeObj as any)._forceClearCache !== undefined) {
+            (activeObj as any)._forceClearCache = true;
+        }
+        
+        // Remove manual height constraint so the box can grow with the new font size
+        delete activeObj.customHeight;
+        if (activeObj.initDimensions) activeObj.initDimensions();
+        activeObj.setCoords();
         canvas.requestRenderAll();
       }
     }
@@ -76,9 +126,10 @@ export function TextFormatToolbar({ annotationId, viewportParams }: TextFormatTo
     const newProps = { [globalPropName]: finalGlobalValue } as any;
     setDefaultTextProps(newProps);
     
-    if (!didInline && !isDraft) {
+    // Always update store so the toolbar displays the new value
+    if (!isDraft) {
        updateAnnotation(annotationId, { props: { ...props, ...newProps } });
-    } else if (!didInline && isDraft) {
+    } else {
        useEditorStore.getState().setDraftAnnotation({
            ...textAnn,
            props: { ...props, ...newProps }
@@ -120,6 +171,12 @@ export function TextFormatToolbar({ annotationId, viewportParams }: TextFormatTo
       ref={toolbarRef}
       className="absolute z-50 bg-white rounded-md shadow-lg border border-neutral-200 flex items-center p-1 gap-1 h-10"
       style={{ top: `${Math.max(0, top)}px`, left: `${left}px` }}
+      onMouseDown={(e) => {
+        // Prevent clicking the toolbar from stealing focus and deselecting the canvas object
+        if ((e.target as HTMLElement).tagName !== 'INPUT') {
+          e.preventDefault();
+        }
+      }}
     >
       {/* Font Family Dropdown */}
       <div className="relative">

frontend/src/features/library/LibraryHeader.tsx

@@ -138,12 +138,20 @@ export const LibraryHeader = ({ currentTab, onTabChange }: { currentTab: 'librar
                     accept="application/pdf"
                     multiple
                     className="hidden"
-                    onChange={(e) => {
-                      const uploader = document.querySelector('input[type="file"][multiple]') as HTMLInputElement
-                      if (uploader && uploader !== e.target) {
-                        uploader.files = e.target.files
-                        const event = new Event('change', { bubbles: true })
-                        uploader.dispatchEvent(event)
+                    onChange={async (e) => {
+                      if (e.target.files && e.target.files.length > 0) {
+                        const files = e.target.files;
+                        for (let i = 0; i < files.length; i++) {
+                          const file = files[i];
+                          if (file.type === 'application/pdf') {
+                            try {
+                              await useLibrary.getState().uploadDocument(file);
+                            } catch (err) {
+                              console.error('Failed to upload', file.name, err);
+                            }
+                          }
+                        }
+                        e.target.value = '';
                       }
                     }}
                   />