Workaround for Tauri bug 13749

https://github.com/tauri-apps/tauri/issues/13749

Fixes #6

src-tauri/Cargo.lock

@@ -796,6 +796,7 @@ name = "drcr"
 version = "0.1.0"
 dependencies = [
  "chrono",
+ "gtk",
  "indexmap 2.10.0",
  "libdrcr",
  "serde",

src-tauri/Cargo.toml

@@ -19,6 +19,7 @@ tauri-build = { version = "2", features = [] }
 
 [dependencies]
 chrono = "0.4.41"
+gtk = "0.18.2"
 indexmap = { version = "2", features = ["serde"] }
 libdrcr = { path = "../libdrcr" }
 serde = { version = "1", features = ["derive"] }

src-tauri/src/lib.rs

@@ -1,5 +1,5 @@
 /*
-	DrCr: Web-based double-entry bookkeeping framework
+	DrCr: Double-entry bookkeeping framework
 	Copyright (C) 2022-2025  Lee Yingtong Li (RunasSudo)
 
 	This program is free software: you can redistribute it and/or modify
@@ -20,6 +20,8 @@ mod libdrcr_austax;
 mod libdrcr_bridge;
 mod sql;
 
+use gtk::prelude::{BinExt, Cast, GtkWindowExt, HeaderBarExt};
+use gtk::{EventBox, HeaderBar};
 use tauri::{AppHandle, Builder, Manager, State};
 use tauri_plugin_store::StoreExt;
 use tokio::sync::Mutex;
@@ -34,9 +36,7 @@ struct AppState {
 // Filename state
 
 #[tauri::command]
-async fn get_open_filename(
+async fn get_open_filename(state: State<'_, Mutex<AppState>>) -> Result<Option<String>, ()> {
-	state: State<'_, Mutex<AppState>>,
-) -> Result<Option<String>, tauri_plugin_sql::Error> {
 	let state = state.lock().await;
 	Ok(state.db_filename.clone())
 }
@@ -46,7 +46,7 @@ async fn set_open_filename(
 	state: State<'_, Mutex<AppState>>,
 	app: AppHandle,
 	filename: Option<String>,
-) -> Result<(), tauri_plugin_sql::Error> {
+) -> Result<(), ()> {
 	let mut state = state.lock().await;
 	state.db_filename = filename.clone();
 
@@ -57,6 +57,34 @@ async fn set_open_filename(
 	Ok(())
 }
 
+#[tauri::command]
+async fn set_window_title(app: AppHandle, label: &str, title: &str) -> Result<(), ()> {
+	// First call Tauri
+	let tauri_window = app.get_webview_window(label).unwrap();
+	tauri_window.set_title(title).unwrap();
+
+	// Then work around https://github.com/tauri-apps/tauri/issues/13749
+	let gtk_window = tauri_window.gtk_window().unwrap();
+	match gtk_window.titlebar() {
+		Some(titlebar) => {
+			let event_box = titlebar
+				.downcast::<EventBox>()
+				.expect("ApplicationWindow.titlebar not EventBox");
+
+			let header_bar = event_box
+				.child()
+				.expect("ApplicationWindow.titlebar has null child")
+				.downcast::<HeaderBar>()
+				.expect("ApplicationWindow.titlebar.child not HeaderBar");
+
+			header_bar.set_title(Some(title));
+		}
+		None => (),
+	}
+
+	Ok(())
+}
+
 // Main method
 
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
@@ -75,7 +103,10 @@ pub fn run() {
 						None
 					}
 				}
-				_ => panic!("Unexpected db_filename in store: {:?}", store.get("db_filename")),
+				_ => panic!(
+					"Unexpected db_filename in store: {:?}",
+					store.get("db_filename")
+				),
 			};
 
 			app.manage(Mutex::new(AppState {
@@ -93,6 +124,7 @@ pub fn run() {
 		.invoke_handler(tauri::generate_handler![
 			get_open_filename,
 			set_open_filename,
+			set_window_title,
 			libdrcr_austax::get_tax_summary,
 			libdrcr_bridge::get_all_transactions_except_earnings_to_equity,
 			libdrcr_bridge::get_all_transactions_except_earnings_to_equity_for_account,

src/db.ts

@@ -49,9 +49,15 @@ export const db = reactive({
 		await invoke('set_open_filename', { 'filename': filename });
 		
 		if (filename !== null) {
-			await getCurrentWindow().setTitle('DrCr – ' + filename?.replaceAll('\\', '/').split('/').at(-1));
+			await invoke('set_window_title', {
+				'label': await getCurrentWindow().label,
+				'title': 'DrCr – ' + filename?.replaceAll('\\', '/').split('/').at(-1)
+			});
 		} else {
-			await getCurrentWindow().setTitle('DrCr');
+			await invoke('set_window_title', {
+				'label': await getCurrentWindow().label,
+				'title': 'DrCr'
+			});
 		}
 		
 		if (filename !== null) {