Move renderer code into a struct (ADT)

src/main.rs

@@ -2,11 +2,22 @@ mod gtfs;
 mod renderer;
 use std::{collections::HashSet, thread, time::Duration};
 
+use sdl3::event::{self, Event, EventWatchCallback};
+
 use crate::renderer::Screen;
 
 
 const SRC_FILE: &str = "/home/nahuel/Downloads/GTFS_Realtime.zip";
 
+struct Callback{}
+impl EventWatchCallback for Callback{
+    fn callback(&mut self, event: Event) {
+        println!("Event: {:#?}", event);
+        return;
+    }
+}
+
+
 fn main() {
 
     let gtfs_prefs = gtfs::structs::Preferences  {
@@ -31,6 +42,13 @@ fn main() {
 
     screen.print(0, "foo!");
 
-    thread::sleep(Duration::new(10, 0));
+    // Main event loop
+    let mut event_subsystem = screen.get_context().event().unwrap().add_event_watch(Callback{});
+    event_subsystem.activate();
+
+    for _ in 0..10 {
+        thread::sleep(Duration::new(1, 0));
+    }
+    event_subsystem.deactivate();
 
 }

src/renderer/mod.rs

@@ -1,16 +1,21 @@
 
 pub mod structs;
 
-use sdl3::{pixels::Color, rect::Rect, render::Canvas, sys::metadata::render, ttf::Font, video::Window};
+use sdl3::{Sdl, pixels::Color, rect::Rect, render::Canvas, sys::metadata::render, ttf::Font, video::Window};
 use structs::{Prefs};
 
 pub struct Screen<'a> {
     canvas: Box<Canvas<Window>>,
-    font: Box<Font<'a>>
+    font: Box<Font<'a>>,
+    context: Box<Sdl>
 }
 
 impl Screen<'_> {
 
+    pub fn get_context(&self) -> &Sdl {
+        return &self.context;
+    }
+
     pub fn print(&mut self, line: u32, text: &str) {
         let rendered_text = self.font.render(text).solid(Color::RED).unwrap();
         let texture_creator = self.canvas.texture_creator();
@@ -49,6 +54,7 @@ impl Screen<'_> {
         let mut screen: Screen = Screen {
             canvas:  Box::new(window.into_canvas()), 
             font: Box::new(font),
+            context: Box::new(sdl_context),
         };
 
         screen.clear();