frontend/src/header_panel.rs

@@ -140,7 +140,7 @@ impl HeaderPanel {
                                     platform::pick_and_load_waveform(Some(file)).await
                                 {
                                     loaded_filename.set_neq(Some(filename));
-                                    hierarchy.set(Some(Rc::new(platform::get_hierarchy().await)))
+                                    hierarchy.set(Some(Arc::new(platform::get_hierarchy().await)))
                                 }
                             })
                         })

frontend/src/main.rs

@@ -26,6 +26,7 @@ type Filename = String;
 struct Store {
     selected_var_refs: MutableVec<wellen::VarRef>,
     hierarchy: Mutable<Option<Arc<wellen::Hierarchy>>>,
+    loaded_filename: Mutable<Option<Filename>>,
 }
 
 static STORE: Lazy<Store> = lazy::default();
@@ -43,7 +44,7 @@ fn root() -> impl Element {
     let hierarchy = STORE.hierarchy.clone();
     let selected_var_refs = STORE.selected_var_refs.clone();
     let layout: Mutable<Layout> = <_>::default();
-    let loaded_filename: Mutable<Option<Filename>> = <_>::default();
+    let loaded_filename = STORE.loaded_filename.clone();
     Column::new()
         .s(Height::fill())
         .s(Scrollbars::y_and_clip_x())

frontend/src/script_bridge.rs

@@ -49,8 +49,9 @@ impl FW {
         0
     }
 
-    pub fn loaded_filename() -> String {
-        format!("todo loaded filename")
+    /// JS: `FW.loaded_filename()` -> `simple.vcd`
+    pub fn loaded_filename() -> Option<String> {
+        STORE.loaded_filename.get_cloned()
     }
 
     /// JS: `FW.selected_vars()` -> `["simple_tb.s.A", "simple_tb.s.B"]`