feat: doublick zoom and pan position if zoomed

src/components/reader/BookReader.tsx

@@ -33,6 +33,8 @@ export function BookReader({ book, pages, onClose }: BookReaderProps) {
     handleNextPage,
     shouldShowDoublePage,
     zoomLevel,
+    panPosition,
+    handleDoubleClick,
   } = usePageNavigation({
     book,
     pages,
@@ -118,6 +120,8 @@ export function BookReader({ book, pages, onClose }: BookReaderProps) {
             isRTL={isRTL}
             onThumbnailLoad={handleThumbnailLoad}
             zoomLevel={zoomLevel}
+            panPosition={panPosition}
+            onDoubleClick={handleDoubleClick}
           />
 
           <NavigationBar

src/components/reader/components/ReaderContent.tsx

@@ -11,6 +11,8 @@ interface ReaderContentProps {
   isRTL: boolean;
   onThumbnailLoad: (pageNumber: number) => void;
   zoomLevel: number;
+  panPosition: { x: number; y: number };
+  onDoubleClick: () => void;
 }
 
 export const ReaderContent = ({
@@ -24,6 +26,8 @@ export const ReaderContent = ({
   isRTL,
   onThumbnailLoad,
   zoomLevel,
+  panPosition,
+  onDoubleClick,
 }: ReaderContentProps) => {
   return (
     <div className="relative flex-1 flex items-center justify-center overflow-hidden p-1">
@@ -37,6 +41,8 @@ export const ReaderContent = ({
           isRTL={isRTL}
           order="first"
           zoomLevel={zoomLevel}
+          panPosition={panPosition}
+          onDoubleClick={onDoubleClick}
         />
 
         {isDoublePage && shouldShowDoublePage(currentPage) && (
@@ -48,6 +54,9 @@ export const ReaderContent = ({
             isDoublePage={true}
             isRTL={isRTL}
             order="second"
+            zoomLevel={zoomLevel}
+            panPosition={panPosition}
+            onDoubleClick={onDoubleClick}
           />
         )}
       </div>

src/components/reader/components/SinglePage.tsx

@@ -10,6 +10,8 @@ interface SinglePageProps {
   isRTL?: boolean;
   order?: "first" | "second";
   zoomLevel?: number;
+  panPosition?: { x: number; y: number };
+  onDoubleClick?: () => void;
 }
 
 export const SinglePage = ({
@@ -20,7 +22,9 @@ export const SinglePage = ({
   isDoublePage = false,
   isRTL = false,
   order = "first",
-  zoomLevel,
+  zoomLevel = 1,
+  panPosition = { x: 0, y: 0 },
+  onDoubleClick,
 }: SinglePageProps) => {
   return (
     <div
@@ -39,14 +43,18 @@ export const SinglePage = ({
         <img
           src={pageUrl}
           style={{
-            transform: `scale(${zoomLevel})`,
+            transform: `scale(${zoomLevel}) translate(${panPosition.x}px, ${panPosition.y}px)`,
+            transformOrigin: "center",
+            transition: zoomLevel === 1 ? "transform 0.3s ease-out" : "none",
+            cursor: "pointer",
           }}
           alt={`Page ${pageNumber}`}
           className={cn(
-            "max-h-full w-auto object-contain transition-opacity duration-300",
+            "max-h-full w-auto object-contain",
             isLoading ? "opacity-0" : "opacity-100"
           )}
           onLoad={() => onLoad(pageNumber)}
+          onDoubleClick={onDoubleClick}
         />
       )}
     </div>

src/components/reader/hooks/usePageNavigation.ts

@@ -19,13 +19,16 @@ export const usePageNavigation = ({
   const [currentPage, setCurrentPage] = useState(book.readProgress?.page || 1);
   const [isLoading, setIsLoading] = useState(true);
   const [secondPageLoading, setSecondPageLoading] = useState(true);
+  const [zoomLevel, setZoomLevel] = useState(1);
+  const [panPosition, setPanPosition] = useState({ x: 0, y: 0 });
   const timeoutRef = useRef<NodeJS.Timeout | null>(null);
   const touchStartXRef = useRef<number | null>(null);
   const touchStartYRef = useRef<number | null>(null);
+  const lastPanPositionRef = useRef({ x: 0, y: 0 });
   const currentPageRef = useRef(currentPage);
   const isRTL = direction === "rtl";
-  const [zoomLevel, setZoomLevel] = useState(1);
   const initialDistanceRef = useRef<number | null>(null);
+  const DEFAULT_ZOOM_LEVEL = 2;
 
   useEffect(() => {
     currentPageRef.current = currentPage;
@@ -113,7 +116,8 @@ export const usePageNavigation = ({
     return Math.sqrt(dx * dx + dy * dy);
   };
 
-  const handleTouchMove = useCallback((event: TouchEvent) => {
+  const handleTouchMove = useCallback(
+    (event: TouchEvent) => {
       if (event.touches.length === 2) {
         const distance = calculateDistance(event.touches[0], event.touches[1]);
         if (initialDistanceRef.current !== null) {
@@ -123,8 +127,22 @@ export const usePageNavigation = ({
             Math.min(3, Math.max(1, prevZoomLevel + (scale - 1) * zoomFactor))
           );
         }
+      } else if (event.touches.length === 1 && zoomLevel > 1) {
+        // Gestion du pan uniquement quand on est zoomé
+        if (touchStartXRef.current !== null && touchStartYRef.current !== null) {
+          const deltaX = event.touches[0].clientX - touchStartXRef.current;
+          const deltaY = event.touches[0].clientY - touchStartYRef.current;
+
+          setPanPosition({
+            x: lastPanPositionRef.current.x + deltaX,
+            y: lastPanPositionRef.current.y + deltaY,
+          });
         }
-  }, []);
+        event.preventDefault(); // Empêcher le scroll de la page
+      }
+    },
+    [zoomLevel]
+  );
 
   const handleTouchStart = useCallback(
     (event: TouchEvent) => {
@@ -133,10 +151,11 @@ export const usePageNavigation = ({
       } else {
         touchStartXRef.current = event.touches[0].clientX;
         touchStartYRef.current = event.touches[0].clientY;
+        lastPanPositionRef.current = panPosition;
         currentPageRef.current = currentPage;
       }
     },
-    [currentPage]
+    [currentPage, panPosition]
   );
 
   const handleTouchEnd = useCallback(
@@ -151,6 +170,15 @@ export const usePageNavigation = ({
       const deltaX = touchEndX - touchStartXRef.current;
       const deltaY = touchEndY - touchStartYRef.current;
 
+      // Si on est zoomé, on met à jour la position finale du pan
+      if (zoomLevel > 1) {
+        lastPanPositionRef.current = {
+          x: lastPanPositionRef.current.x + deltaX,
+          y: lastPanPositionRef.current.y + deltaY,
+        };
+        return;
+      }
+
       // Si le déplacement vertical est plus important que le déplacement horizontal,
       // on ne fait rien (pour éviter de confondre avec un scroll)
       if (Math.abs(deltaY) > Math.abs(deltaX)) return;
@@ -177,9 +205,17 @@ export const usePageNavigation = ({
       touchStartXRef.current = null;
       touchStartYRef.current = null;
     },
-    [handleNextPage, handlePreviousPage, isRTL]
+    [handleNextPage, handlePreviousPage, isRTL, zoomLevel]
   );
 
+  // Reset du pan quand on change de page ou dezoom
+  useEffect(() => {
+    if (zoomLevel === 1) {
+      setPanPosition({ x: 0, y: 0 });
+      lastPanPositionRef.current = { x: 0, y: 0 };
+    }
+  }, [zoomLevel, currentPage]);
+
   useEffect(() => {
     setIsLoading(true);
     setSecondPageLoading(true);
@@ -237,6 +273,15 @@ export const usePageNavigation = ({
     };
   }, [syncReadProgress]);
 
+  const handleDoubleClick = useCallback(() => {
+    setZoomLevel((prevZoom) => {
+      if (prevZoom === 1) {
+        return DEFAULT_ZOOM_LEVEL;
+      }
+      return 1;
+    });
+  }, []);
+
   return {
     currentPage,
     navigateToPage,
@@ -248,5 +293,7 @@ export const usePageNavigation = ({
     handleNextPage,
     shouldShowDoublePage,
     zoomLevel,
+    panPosition,
+    handleDoubleClick,
   };
 };