Cursor gizmo mode changing inputs are working

src/debug_plugin.rs

@@ -5,7 +5,11 @@ pub struct BoidsDebugPlugin;
 impl Plugin for BoidsDebugPlugin {
     fn build(&self, app: &mut App) {
         app.add_systems(Startup, setup)
-            .add_systems(FixedUpdate, update_cursor);
+            .add_systems(FixedUpdate, (
+                update_cursor,
+                update_scanner_mode,
+                print_gizmo_config,
+            ));
     }
 }
 
@@ -44,13 +48,13 @@ impl Default for ScannerWidget {
 #[derive(Component)]
 struct Cursor;
 
-#[derive(Component)]
+#[derive(Component, Debug)]
 enum SelectionMode {
     NearestSingle,
     CircularArea,
 }
 
-#[derive(Component)]
+#[derive(Component, Debug)]
 enum ScannerMode {
     CenterOfMass,
     Velocity,
@@ -77,3 +81,35 @@ fn update_cursor(
         cursor.translation = cursor_in_world.extend(0.0);
     }
 }
+
+// System to monitor for mouse and keyboard input and then update
+// the scanner's modes accordingly.
+fn update_scanner_mode(
+    keycodes: Res<ButtonInput<KeyCode>>,
+    mousebuttons: Res<ButtonInput<MouseButton>>,
+    mut scanner_query: Query<(&mut SelectionMode, &mut ScannerMode), With<Cursor>>, 
+) {
+    // I'm making another assertion that there is exactly one scanner.
+    let (mut select_mode, mut scan_mode) = scanner_query.get_single_mut().unwrap();
+    
+    // Assign selection mode
+    if keycodes.just_pressed(KeyCode::Digit1) {
+        *select_mode = SelectionMode::NearestSingle;
+    } else if keycodes.just_pressed(KeyCode::Digit2) {
+        *select_mode = SelectionMode::CircularArea;
+    }
+
+    // Select property scanning mode
+    if mousebuttons.just_pressed(MouseButton::Left) {
+        *scan_mode = ScannerMode::CenterOfMass;
+    } else if mousebuttons.just_pressed(MouseButton::Right) {
+        *scan_mode = ScannerMode::Velocity;
+    }
+}
+
+fn print_gizmo_config(
+    query: Query<(&SelectionMode, &ScannerMode), With<Cursor>>,
+) {
+    let (select, scan) = query.get_single().unwrap();
+    println!("Selection: {select:?}, Scanning: {scan:?}");
+}