add minimal example

examples/minimal.rs

@@ -0,0 +1,20 @@
+use iris::{prelude::*, winit::*};
+
+struct State {
+    ui: DefaultUi,
+}
+
+fn main() {
+    UiApp::<State>::run();
+}
+
+impl DefaultUiState for State {
+    fn new(mut ui: DefaultUi, _proxy: Proxy<Self::Event>) -> Self {
+        rect(Color::RED).set_root(&mut ui);
+        Self { ui }
+    }
+
+    fn ui(&mut self) -> &mut DefaultUi {
+        &mut self.ui
+    }
+}

src/lib.rs

@@ -9,6 +9,7 @@
 #![feature(const_destruct)]
 #![feature(portable_simd)]
 #![feature(gen_blocks)]
+#![feature(associated_type_defaults)]
 
 pub mod core;
 pub mod layout;

src/winit/mod.rs

@@ -31,7 +31,7 @@ pub struct DefaultUi {
 }
 
 pub trait DefaultUiState: 'static {
-    type Event: 'static;
+    type Event: 'static = ();
     fn new(ui: DefaultUi, proxy: Proxy<Self::Event>) -> Self;
     fn ui(&mut self) -> &mut DefaultUi;
     #[allow(unused_variables)]