From 93814e98411d342e32e4b458295692f1c7428903 Mon Sep 17 00:00:00 2001
From: Elijah Voigt <elijah.caine.mv@gmail.com>
Date: Tue, 24 Jun 2025 14:50:06 -0700
Subject: [PATCH] Synced resource example

---
 examples/sync_resource_to_ui.rs | 50 +++++++++++++++++++++++++++++++++
 src/bin/hello/main.rs           | 16 -----------
 src/debug.rs                    |  2 --
 src/lib.rs                      |  6 +++-
 src/ui.rs                       | 17 +++++++++++
 5 files changed, 72 insertions(+), 19 deletions(-)
 create mode 100644 examples/sync_resource_to_ui.rs
 delete mode 100644 src/bin/hello/main.rs
 create mode 100644 src/ui.rs

diff --git a/examples/sync_resource_to_ui.rs b/examples/sync_resource_to_ui.rs
new file mode 100644
index 0000000..4271822
--- /dev/null
+++ b/examples/sync_resource_to_ui.rs
@@ -0,0 +1,50 @@
+use bevy::input::mouse::MouseMotion;
+use games::*;
+
+fn main() {
+    App::new()
+        .init_resource::<Thing>()
+        .add_plugins(BaseGamePlugin { camera: CameraType::Camera3d })
+        .add_systems(Startup, init_ui)
+        .add_systems(Update, (
+            sync_resource_to_ui::<Thing>.run_if(resource_changed::<Thing>),
+            update_foo.run_if(on_event::<MouseMotion>)
+        ))
+        .run();
+}
+
+#[derive(Resource, Debug, Default)]
+struct Thing(u8);
+
+impl Display for Thing {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+fn init_ui(
+    mut commands: Commands
+) {
+    commands.spawn((
+            Node {
+                align_self: AlignSelf::Start,
+                justify_self: JustifySelf::Center,
+                ..default()
+            },
+            Text("Displays a sync'd resource tracking the number of mouse events (mod 256)".into()),
+            ));
+    commands.spawn((Node {
+        align_self: AlignSelf::Center,
+        justify_self: JustifySelf::Center,
+        ..default()
+    }, Text("Placeholder".into()), SyncResource::<Thing>::default()));
+}
+
+fn update_foo(
+    mut events: EventReader<MouseMotion>,
+    mut thing: ResMut<Thing>,
+) {
+    events.read().for_each(|_| {
+        thing.0 = thing.0.overflowing_add(1).0;
+    });
+}
diff --git a/src/bin/hello/main.rs b/src/bin/hello/main.rs
deleted file mode 100644
index 3890900..0000000
--- a/src/bin/hello/main.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-use games::*;
-
-fn main() {
-    App::new()
-        .add_plugins(BaseGamePlugin { camera: CameraType::Camera3d })
-        .add_systems(Update, (
-            f.run_if(any_component_added::<Foo>),
-            f.run_if(any_component_changed::<Foo>),
-        ))
-        .run();
-}
-
-#[derive(Component)]
-struct Foo;
-
-fn f() { }
diff --git a/src/debug.rs b/src/debug.rs
index 8ba4a84..2faf811 100644
--- a/src/debug.rs
+++ b/src/debug.rs
@@ -1,5 +1,3 @@
-use bevy::color::palettes::css::{BLACK, RED, WHITE};
-
 use super::*;
 
 /// Debugging systems, resources, events, etc.
diff --git a/src/lib.rs b/src/lib.rs
index 90ce33f..9f4e660 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,13 @@
 mod base_game;
 mod debug;
 mod scheduling;
+mod ui;
 
-pub use bevy::{prelude::*, input::{keyboard::KeyboardInput, ButtonState}};
+pub use std::fmt::Display;
+
+pub use bevy::{prelude::*, input::{keyboard::KeyboardInput, ButtonState}, color::palettes::css::{BLACK, RED, WHITE}};
 
 pub use base_game::*;
 pub use debug::*;
 pub use scheduling::*;
+pub use ui::*;
diff --git a/src/ui.rs b/src/ui.rs
new file mode 100644
index 0000000..4d1fce1
--- /dev/null
+++ b/src/ui.rs
@@ -0,0 +1,17 @@
+use super::*;
+
+/// Marker component for handling Resource -> Ui Sync
+#[derive(Component, Default, Debug)]
+pub struct SyncResource<R: Resource + Default + Display>(R);
+
+/// Sync a generic resource to the UI
+///
+/// Mostly useful for quick n' dirty getting data to the user
+pub fn sync_resource_to_ui<R: Resource + Default + Display>(
+    mut q: Query<&mut Text, With<SyncResource<R>>>,
+    r: Res<R>,
+) {
+    q.iter_mut().for_each(|mut t| {
+        t.0 = format!("{}", *r);
+    });
+}