Use Name component for gamepad (#16233)

# Objective

Addressing a suggestion I made in Discord: store gamepad name as a
`Name` component.
Advantages: 
- Will be nicely displayed in inspector / editor.
- Easier to spawn in tests, just `world.spawn(Gamepad::default())`.

## Solution

`Gamepad` component now stores only vendor and product IDs and `Name`
stores the gamepad name.
Since `GamepadInfo` is no longer necessary, I removed it and merged its
fields into the connection event.

## Testing

- Run unit tests.

---

## Migration Guide

- `GamepadInfo` no longer exists:
  -  Name now accesible via `Name` component.
  -  Other information available on `Gamepad` component directly.
  - `GamepadConnection::Connected` now stores all info fields directly.

crates/bevy_gilrs/src/gilrs_system.rs

@@ -8,7 +8,7 @@ use bevy_ecs::prelude::Commands;
 use bevy_ecs::system::NonSendMut;
 use bevy_ecs::system::ResMut;
 use bevy_input::gamepad::{
-    GamepadConnection, GamepadConnectionEvent, GamepadInfo, RawGamepadAxisChangedEvent,
+    GamepadConnection, GamepadConnectionEvent, RawGamepadAxisChangedEvent,
     RawGamepadButtonChangedEvent, RawGamepadEvent,
 };
 use gilrs::{ev::filter::axis_dpad_to_button, EventType, Filter};
@@ -26,15 +26,13 @@ pub fn gilrs_event_startup_system(
         gamepads.id_to_entity.insert(id, entity);
         gamepads.entity_to_id.insert(entity, id);
 
-        let info = GamepadInfo {
-            name: gamepad.name().into(),
-            vendor_id: gamepad.vendor_id(),
-            product_id: gamepad.product_id(),
-        };
-
         events.send(GamepadConnectionEvent {
             gamepad: entity,
-            connection: GamepadConnection::Connected(info),
+            connection: GamepadConnection::Connected {
+                name: gamepad.name().to_string(),
+                vendor_id: gamepad.vendor_id(),
+                product_id: gamepad.product_id(),
+            },
         });
     }
 }
@@ -62,20 +60,17 @@ pub fn gilrs_event_system(
                     entity
                 });
 
-                let info = GamepadInfo {
+                let event = GamepadConnectionEvent::new(
-                    name: pad.name().into(),
-                    vendor_id: pad.vendor_id(),
-                    product_id: pad.product_id(),
-                };
-
-                events.send(
-                    GamepadConnectionEvent::new(entity, GamepadConnection::Connected(info.clone()))
-                        .into(),
-                );
-                connection_events.send(GamepadConnectionEvent::new(
                     entity,
-                    GamepadConnection::Connected(info),
+                    GamepadConnection::Connected {
-                ));
+                        name: pad.name().to_string(),
+                        vendor_id: pad.vendor_id(),
+                        product_id: pad.product_id(),
+                    },
+                );
+
+                events.send(event.clone().into());
+                connection_events.send(event);
             }
             EventType::Disconnected => {
                 let gamepad = gamepads

crates/bevy_input/Cargo.toml

@@ -21,6 +21,7 @@ serialize = ["serde", "smol_str/serde"]
 [dependencies]
 # bevy
 bevy_app = { path = "../bevy_app", version = "0.15.0-dev", default-features = false }
+bevy_core = { path = "../bevy_core", version = "0.15.0-dev" }
 bevy_ecs = { path = "../bevy_ecs", version = "0.15.0-dev", default-features = false, features = [
   "serialize",
 ] }

crates/bevy_input/src/gamepad.rs

@@ -1,6 +1,7 @@
 //! The gamepad input functionality.
 
 use crate::{Axis, ButtonInput, ButtonState};
+use bevy_core::Name;
 use bevy_ecs::{
     change_detection::DetectChangesMut,
     component::Component,
@@ -148,7 +149,7 @@ impl GamepadConnectionEvent {
 
     /// Is the gamepad connected?
     pub fn connected(&self) -> bool {
-        matches!(self.connection, GamepadConnection::Connected(_))
+        matches!(self.connection, GamepadConnection::Connected { .. })
     }
 
     /// Is the gamepad disconnected?
@@ -318,10 +319,10 @@ pub enum ButtonSettingsError {
 /// ```
 /// # use bevy_input::gamepad::{Gamepad, GamepadAxis, GamepadButton};
 /// # use bevy_ecs::system::Query;
+/// # use bevy_core::Name;
 /// #
-/// fn gamepad_usage_system(gamepads: Query<&Gamepad>) {
+/// fn gamepad_usage_system(gamepads: Query<(&Name, &Gamepad)>) {
-///     for gamepad in &gamepads {
+///     for (name, gamepad) in &gamepads {
-///         let name = &gamepad.info.name;
 ///         println!("{name}");
 ///
 ///         if gamepad.digital.just_pressed(GamepadButton::North) {
@@ -338,31 +339,22 @@ pub enum ButtonSettingsError {
 #[cfg_attr(feature = "bevy_reflect", derive(Reflect), reflect(Debug))]
 #[require(GamepadSettings)]
 pub struct Gamepad {
-    /// Metadata.
+    /// The USB vendor ID as assigned by the USB-IF, if available.
-    pub info: GamepadInfo,
+    pub vendor_id: Option<u16>,
+
+    /// The USB product ID as assigned by the [vendor], if available.
+    ///
+    /// [vendor]: Self::vendor_id
+    pub product_id: Option<u16>,
+
     /// [`ButtonInput`] of [`GamepadButton`] representing their digital state
     pub digital: ButtonInput<GamepadButton>,
+
     /// [`Axis`] of [`GamepadButton`] representing their analog state.
     pub analog: Axis<GamepadInput>,
 }
 
 impl Gamepad {
-    /// Creates a gamepad with the given metadata.
-    pub fn new(info: GamepadInfo) -> Self {
-        let mut analog = Axis::default();
-        for button in GamepadButton::all().iter().copied() {
-            analog.set(button, 0.0);
-        }
-        for axis_type in GamepadAxis::all().iter().copied() {
-            analog.set(axis_type, 0.0);
-        }
-        Self {
-            info,
-            analog,
-            digital: ButtonInput::default(),
-        }
-    }
-
     /// Returns the left stick as a [`Vec2`]
     pub fn left_stick(&self) -> Vec2 {
         Vec2 {
@@ -390,32 +382,23 @@ impl Gamepad {
     }
 }
 
-// Note that we don't expose `gilrs::Gamepad::uuid` due to
+impl Default for Gamepad {
-// https://gitlab.com/gilrs-project/gilrs/-/issues/153.
+    fn default() -> Self {
-//
+        let mut analog = Axis::default();
-/// Metadata associated with a [`Gamepad`].
+        for button in GamepadButton::all().iter().copied() {
-#[derive(Debug, Default, Clone, PartialEq, Eq)]
+            analog.set(button, 0.0);
-#[cfg_attr(feature = "bevy_reflect", derive(Reflect), reflect(Debug, PartialEq))]
+        }
-#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
+        for axis_type in GamepadAxis::all().iter().copied() {
-#[cfg_attr(
+            analog.set(axis_type, 0.0);
-    all(feature = "serialize", feature = "bevy_reflect"),
+        }
-    reflect(Serialize, Deserialize)
-)]
-pub struct GamepadInfo {
-    /// The name of the gamepad.
-    ///
-    /// This name is generally defined by the OS.
-    ///
-    /// For example on Windows the name may be "HID-compliant game controller".
-    pub name: String,
 
-    /// The USB vendor ID as assigned by the USB-IF, if available.
+        Self {
-    pub vendor_id: Option<u16>,
+            vendor_id: None,
-
+            product_id: None,
-    /// The USB product ID as assigned by the [vendor], if available.
+            digital: Default::default(),
-    ///
+            analog,
-    /// [vendor]: Self::vendor_id
+        }
-    pub product_id: Option<u16>,
+    }
 }
 
 /// Represents gamepad input types that are mapped in the range [0.0, 1.0].
@@ -1227,12 +1210,23 @@ pub fn gamepad_connection_system(
     for connection_event in connection_events.read() {
         let id = connection_event.gamepad;
         match &connection_event.connection {
-            GamepadConnection::Connected(info) => {
+            GamepadConnection::Connected {
+                name,
+                vendor_id,
+                product_id,
+            } => {
                 let Some(mut gamepad) = commands.get_entity(id) else {
                     warn!("Gamepad {:} removed before handling connection event.", id);
                     continue;
                 };
-                gamepad.insert(Gamepad::new(info.clone()));
+                gamepad.insert((
+                    Name::new(name.clone()),
+                    Gamepad {
+                        vendor_id: *vendor_id,
+                        product_id: *product_id,
+                        ..Default::default()
+                    },
+                ));
                 info!("Gamepad {:?} connected.", id);
             }
             GamepadConnection::Disconnected => {
@@ -1250,6 +1244,9 @@ pub fn gamepad_connection_system(
     }
 }
 
+// Note that we don't expose `gilrs::Gamepad::uuid` due to
+// https://gitlab.com/gilrs-project/gilrs/-/issues/153.
+//
 /// The connection status of a gamepad.
 #[derive(Debug, Clone, PartialEq)]
 #[cfg_attr(feature = "bevy_reflect", derive(Reflect), reflect(Debug, PartialEq))]
@@ -1260,7 +1257,20 @@ pub fn gamepad_connection_system(
 )]
 pub enum GamepadConnection {
     /// The gamepad is connected.
-    Connected(GamepadInfo),
+    Connected {
+        /// The name of the gamepad.
+        ///
+        /// This name is generally defined by the OS.
+        ///
+        /// For example on Windows the name may be "HID-compliant game controller".
+        name: String,
+
+        /// The USB vendor ID as assigned by the USB-IF, if available.
+        vendor_id: Option<u16>,
+
+        /// The USB product ID as assigned by the vendor, if available.
+        product_id: Option<u16>,
+    },
     /// The gamepad is disconnected.
     Disconnected,
 }
@@ -1497,8 +1507,8 @@ mod tests {
         GamepadAxis, GamepadAxisChangedEvent, GamepadButton, GamepadButtonChangedEvent,
         GamepadButtonStateChangedEvent,
         GamepadConnection::{Connected, Disconnected},
-        GamepadConnectionEvent, GamepadEvent, GamepadInfo, GamepadSettings,
+        GamepadConnectionEvent, GamepadEvent, GamepadSettings, RawGamepadAxisChangedEvent,
-        RawGamepadAxisChangedEvent, RawGamepadButtonChangedEvent, RawGamepadEvent,
+        RawGamepadButtonChangedEvent, RawGamepadEvent,
     };
     use crate::ButtonState;
     use bevy_app::{App, PreUpdate};
@@ -1871,7 +1881,11 @@ mod tests {
                 .resource_mut::<Events<GamepadConnectionEvent>>()
                 .send(GamepadConnectionEvent::new(
                     gamepad,
-                    Connected(GamepadInfo::default()),
+                    Connected {
+                        name: "Test gamepad".to_string(),
+                        vendor_id: None,
+                        product_id: None,
+                    },
                 ));
             gamepad
         }

crates/bevy_input/src/lib.rs

@@ -57,7 +57,7 @@ use gamepad::{
     gamepad_connection_system, gamepad_event_processing_system, GamepadAxis,
     GamepadAxisChangedEvent, GamepadButton, GamepadButtonChangedEvent,
     GamepadButtonStateChangedEvent, GamepadConnection, GamepadConnectionEvent, GamepadEvent,
-    GamepadInfo, GamepadInput, GamepadRumbleRequest, GamepadSettings, RawGamepadAxisChangedEvent,
+    GamepadInput, GamepadRumbleRequest, GamepadSettings, RawGamepadAxisChangedEvent,
     RawGamepadButtonChangedEvent, RawGamepadEvent,
 };
 
@@ -142,7 +142,6 @@ impl Plugin for InputPlugin {
                 .register_type::<GamepadButtonChangedEvent>()
                 .register_type::<GamepadAxisChangedEvent>()
                 .register_type::<GamepadButtonStateChangedEvent>()
-                .register_type::<GamepadInfo>()
                 .register_type::<GamepadConnection>()
                 .register_type::<GamepadSettings>()
                 .register_type::<GamepadAxis>()

examples/tools/gamepad_viewer.rs

@@ -447,7 +447,7 @@ fn update_axes(
 
 fn update_connected(
     mut connected: EventReader<GamepadConnectionEvent>,
-    gamepads: Query<(Entity, &Gamepad)>,
+    gamepads: Query<(Entity, &Name), With<Gamepad>>,
     text: Single<Entity, With<ConnectedGamepadsText>>,
     mut writer: TextUiWriter,
 ) {
@@ -458,7 +458,7 @@ fn update_connected(
 
     let formatted = gamepads
         .iter()
-        .map(|(entity, gamepad)| format!("{} - {}", entity, gamepad.info.name))
+        .map(|(entity, name)| format!("{} - {}", entity, name))
         .collect::<Vec<_>>()
         .join("\n");