Surface error notifications

src/window/game.rs

@@ -1,12 +1,15 @@
+use std::sync::mpsc;
+
 use crate::{
     app::UserEvent,
     emulator::{EmulatorClient, EmulatorCommand, SimId},
 };
 use egui::{
-    ecolor::HexColor, menu, Align2, Button, CentralPanel, Color32, Context, Frame, Layout,
-    Response, Sense, TopBottomPanel, Ui, Vec2, ViewportBuilder, ViewportCommand, ViewportId,
-    WidgetText, Window,
+    ecolor::HexColor, menu, Align2, Button, CentralPanel, Color32, Context, Direction, Frame,
+    Layout, Response, Sense, TopBottomPanel, Ui, Vec2, ViewportBuilder, ViewportCommand,
+    ViewportId, WidgetText, Window,
 };
+use egui_toast::{Toast, Toasts};
 use winit::event_loop::EventLoopProxy;
 
 use super::{
@@ -36,6 +39,7 @@ pub struct GameWindow {
     display_mode: DisplayMode,
     colors: [Color32; 2],
     screen: Option<GameScreen>,
+    messages: Option<mpsc::Receiver<Toast>>,
     color_picker: Option<ColorPickerState>,
 }
 
@@ -48,6 +52,7 @@ impl GameWindow {
             display_mode: DisplayMode::Anaglyph,
             colors: COLOR_PRESETS[0],
             screen: None,
+            messages: None,
             color_picker: None,
         }
     }
@@ -257,6 +262,14 @@ impl AppWindow for GameWindow {
     }
 
     fn show(&mut self, ctx: &Context) {
+        let mut toasts = Toasts::new()
+            .anchor(Align2::LEFT_BOTTOM, (10.0, 10.0))
+            .direction(Direction::BottomUp);
+        if let Some(messages) = self.messages.as_mut() {
+            while let Ok(toast) = messages.try_recv() {
+                toasts.add(toast);
+            }
+        }
         TopBottomPanel::top("menubar")
             .exact_height(22.0)
             .show(ctx, |ui| {
@@ -280,13 +293,19 @@ impl AppWindow for GameWindow {
                 ui.add(screen);
             }
         });
+        toasts.show(ctx);
     }
 
     fn on_init(&mut self, render_state: &egui_wgpu::RenderState) {
         let (screen, sink) = GameScreen::init(render_state);
-        self.client
-            .send_command(EmulatorCommand::SetRenderer(self.sim_id, sink));
-        self.screen = Some(screen)
+        let (message_sink, message_source) = mpsc::channel();
+        self.client.send_command(EmulatorCommand::ConnectToSim(
+            self.sim_id,
+            sink,
+            message_sink,
+        ));
+        self.screen = Some(screen);
+        self.messages = Some(message_source);
     }
 
     fn on_destroy(&mut self) {