fix(web): lecteur CBZ/CBR mode vertical — capturer naturalWidth/naturalHeight avant neutralisation de currentTarget par React (régression #37)

apps/web/src/reader/CbzReader.tsx

@@ -217,9 +217,10 @@ export function CbzReader({
                 loading="lazy"
                 style={verticalImageStyle(item.page)}
                 onLoad={(event) => {
+                  const { naturalWidth, naturalHeight } = event.currentTarget;
                   setImageSizes((current) => ({
                     ...current,
-                    [item.page]: { width: event.currentTarget.naturalWidth, height: event.currentTarget.naturalHeight }
+                    [item.page]: { width: naturalWidth, height: naturalHeight }
                   }));
                 }}
                 onError={() => setPageError(`Page ${item.page} indisponible.`)}

apps/web/src/reader/CbzReaderNaturalWidth.test.tsx

@@ -0,0 +1,94 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+const hookState = vi.hoisted(() => ({
+  stateIndex: 0,
+  states: [] as unknown[],
+  updates: [] as unknown[][]
+}));
+
+vi.mock("react", async () => {
+  const actual = await vi.importActual<typeof import("react")>("react");
+  return {
+    ...actual,
+    useCallback: (callback: unknown) => callback,
+    useEffect: () => undefined,
+    useRef: (current: unknown) => ({ current }),
+    useState: (initial: unknown) => {
+      const index = hookState.stateIndex;
+      hookState.stateIndex += 1;
+      hookState.updates[index] = [];
+      return [
+        hookState.states[index] ?? initial,
+        (next: unknown) => {
+          hookState.updates[index].push(next);
+        }
+      ];
+    }
+  };
+});
+
+vi.mock("../api/client", () => ({
+  api: {
+    cbzPages: vi.fn().mockResolvedValue({ bookId: 2, pageCount: 1, pages: [{ page: 1, name: "page-1.jpg" }] }),
+    cbzPageUrl: (bookId: number, page: number) => `/books/${bookId}/pages/${page}`
+  }
+}));
+
+import { CbzReader } from "./CbzReader";
+
+type ElementLike = {
+  type: unknown;
+  props?: Record<string, unknown> & { children?: unknown };
+};
+
+function isElementLike(value: unknown): value is ElementLike {
+  return Boolean(value && typeof value === "object" && "type" in value);
+}
+
+function findElementsByType(node: unknown, type: string): ElementLike[] {
+  if (Array.isArray(node)) return node.flatMap((child) => findElementsByType(child, type));
+  if (!isElementLike(node)) return [];
+
+  const matches = node.type === type ? [node] : [];
+  return [...matches, ...findElementsByType(node.props?.children, type)];
+}
+
+describe("CbzReader vertical image load", () => {
+  beforeEach(() => {
+    hookState.stateIndex = 0;
+    hookState.updates = [];
+    hookState.states = [
+      { bookId: 2, pageCount: 1, pages: [{ page: 1, name: "page-1.jpg" }] },
+      undefined,
+      undefined,
+      0,
+      0,
+      { width: 800, height: 1200 },
+      null,
+      {}
+    ];
+  });
+
+  it("records vertical image dimensions before React clears the load event target", () => {
+    const tree = CbzReader({
+      bookId: 2,
+      page: 1,
+      zoom: 100,
+      mode: "vertical",
+      onPageCommit: vi.fn(),
+      onControlsChange: vi.fn()
+    });
+    const image = findElementsByType(tree, "img")[0];
+    const onLoad = image.props?.onLoad as (event: { currentTarget: { naturalWidth: number; naturalHeight: number } | null }) => void;
+    const event: { currentTarget: { naturalWidth: number; naturalHeight: number } | null } = { currentTarget: { naturalWidth: 480, naturalHeight: 960 } };
+
+    onLoad(event);
+    event.currentTarget = null;
+
+    let nextSizes: unknown;
+    expect(() => {
+      nextSizes = (hookState.updates[7][0] as (current: Record<number, unknown>) => unknown)({});
+    }).not.toThrow();
+    expect(nextSizes).toEqual({ 1: { width: 480, height: 960 } });
+  });
+});