src/app.rs

@@ -211,11 +211,15 @@ impl ApplicationHandler<UserEvent> for Application {
                 );
                 self.open(event_loop, Box::new(p2));
             }
-            UserEvent::Quit => {
+            UserEvent::Quit(sim_id) => {
+                self.viewports
+                    .retain(|_, viewport| viewport.app.sim_id() != sim_id);
+                if !self.viewports.contains_key(&ViewportId::ROOT) {
                     event_loop.exit();
                 }
             }
         }
+    }
 
     fn about_to_wait(&mut self, _event_loop: &ActiveEventLoop) {
         if let Some(viewport) = self.viewports.get(&ViewportId::ROOT) {
@@ -401,7 +405,7 @@ pub enum UserEvent {
     OpenDebugger(SimId),
     OpenInput,
     OpenPlayer2,
-    Quit,
+    Quit(SimId),
 }
 
 pub enum Action {

src/window.rs

@@ -5,6 +5,8 @@ pub use gdb::GdbServerWindow;
 pub use input::InputWindow;
 use winit::event::KeyEvent;
 
+use crate::emulator::SimId;
+
 mod about;
 mod game;
 mod game_screen;
@@ -13,6 +15,9 @@ mod input;
 
 pub trait AppWindow {
     fn viewport_id(&self) -> ViewportId;
+    fn sim_id(&self) -> SimId {
+        SimId::Player1
+    }
     fn initial_viewport(&self) -> ViewportBuilder;
     fn show(&mut self, ctx: &Context);
     fn on_init(&mut self, render_state: &egui_wgpu::RenderState) {

src/window/game.rs

@@ -78,19 +78,20 @@ impl GameWindow {
                 ui.close_menu();
             }
             if ui.button("Quit").clicked() {
-                ctx.send_viewport_cmd(ViewportCommand::Close);
+                let _ = self.proxy.send_event(UserEvent::Quit(self.sim_id));
             }
         });
         ui.menu_button("Emulation", |ui| {
             let state = self.client.emulator_state();
             let is_ready = self.client.sim_state(self.sim_id) == SimState::Ready;
             let can_pause = is_ready && state == EmulatorState::Running;
+            let can_resume = is_ready && state == EmulatorState::Paused;
             if state == EmulatorState::Running {
-                if ui.add_enabled(is_ready, Button::new("Pause")).clicked() {
+                if ui.add_enabled(can_pause, Button::new("Pause")).clicked() {
                     self.client.send_command(EmulatorCommand::Pause);
                     ui.close_menu();
                 }
-            } else if ui.add_enabled(can_pause, Button::new("Resume")).clicked() {
+            } else if ui.add_enabled(can_resume, Button::new("Resume")).clicked() {
                 self.client.send_command(EmulatorCommand::Resume);
                 ui.close_menu();
             }
@@ -317,6 +318,10 @@ impl AppWindow for GameWindow {
         }
     }
 
+    fn sim_id(&self) -> SimId {
+        self.sim_id
+    }
+
     fn initial_viewport(&self) -> ViewportBuilder {
         ViewportBuilder::default()
             .with_title("Lemur")
@@ -380,6 +385,7 @@ impl AppWindow for GameWindow {
         if self.sim_id == SimId::Player2 {
             self.client.send_command(EmulatorCommand::StopSecondSim);
         }
+        let _ = self.proxy.send_event(UserEvent::Quit(self.sim_id));
     }
 }
 

src/window/gdb.rs

@@ -12,7 +12,8 @@ use super::AppWindow;
 pub struct GdbServerWindow {
     sim_id: SimId,
     port_str: String,
-    launched: bool,
+    connected: bool,
+    quit_on_disconnect: bool,
     server: GdbServer,
     proxy: EventLoopProxy<UserEvent>,
 }
@@ -22,7 +23,8 @@ impl GdbServerWindow {
         Self {
             sim_id,
             port_str: (8080 + sim_id.to_index()).to_string(),
-            launched: false,
+            connected: false,
+            quit_on_disconnect: false,
             server: GdbServer::new(sim_id, client),
             proxy,
         }
@@ -31,8 +33,9 @@ impl GdbServerWindow {
     pub fn launch(&mut self, port: u16) {
         self.server.stop();
         self.port_str = port.to_string();
-        self.launched = true;
+        self.quit_on_disconnect = true;
         self.server.start(port);
+        self.connected = true;
     }
 }
 
@@ -41,6 +44,10 @@ impl AppWindow for GdbServerWindow {
         ViewportId::from_hash_of(format!("Debugger-{}", self.sim_id))
     }
 
+    fn sim_id(&self) -> SimId {
+        self.sim_id
+    }
+
     fn initial_viewport(&self) -> ViewportBuilder {
         ViewportBuilder::default()
             .with_title(format!("GDB Server ({})", self.sim_id))
@@ -61,16 +68,20 @@ impl AppWindow for GdbServerWindow {
                 ui.label("Port");
                 let port_editor = TextEdit::singleline(&mut self.port_str).desired_width(100.0);
                 ui.add_enabled(!status.running(), port_editor);
+                ui.checkbox(&mut self.quit_on_disconnect, "Quit on disconnect");
             });
 
             if !status.running() {
-                if self.launched {
-                    self.proxy.send_event(UserEvent::Quit).unwrap();
+                if self.connected && self.quit_on_disconnect {
+                    self.proxy.send_event(UserEvent::Quit(self.sim_id)).unwrap();
+                } else {
+                    self.connected = false;
                 }
                 let start_button = Button::new("Start");
                 if ui.add_enabled(port_num.is_some(), start_button).clicked() {
                     let port = port_num.unwrap();
                     self.server.start(port);
+                    self.connected = true;
                 }
             } else {
                 let stop_button = Button::new("Stop");