Change PDF rendering

src-tauri/assets/viewer/message-bridge.js

@@ -0,0 +1,37 @@
+/**
+ * MessageBridge — postMessage protocol between the PDF viewer iframe
+ * and the parent Leptos application.
+ *
+ * Inbound  (parent → iframe): "pdf.page.next" | "pdf.page.prev"
+ * Outbound (iframe → parent): { type: "brittle:keydown", key, ctrlKey, ... }
+ */
+export class MessageBridge {
+  /**
+   * @param {Function} onPageNext - () => void
+   * @param {Function} onPagePrev - () => void
+   */
+  constructor(onPageNext, onPagePrev) {
+    this._handler = ev => {
+      if (ev.data === "pdf.page.next") onPageNext();
+      if (ev.data === "pdf.page.prev") onPagePrev();
+    };
+    window.addEventListener("message", this._handler);
+  }
+
+  /** Forward a keydown event to the parent window for global keybindings. */
+  forwardKeydown(ev) {
+    if (window.parent === window) return;
+    window.parent.postMessage({
+      type:     "brittle:keydown",
+      key:      ev.key,
+      ctrlKey:  ev.ctrlKey,
+      shiftKey: ev.shiftKey,
+      altKey:   ev.altKey,
+      metaKey:  ev.metaKey,
+    }, "*");
+  }
+
+  disconnect() {
+    window.removeEventListener("message", this._handler);
+  }
+}