Derived Copy trait for bevy_input events, Serialize/Deserialize for events in bevy_input and bevy_windows, PartialEq for events in both, and Eq where possible in both. (#6023)

# Objective

Add traits to events in `bevy_input` and `bevy_windows`: `Copy`, `Serialize`/`Deserialize`, `PartialEq`, and `Eq`, as requested in https://github.com/bevyengine/bevy/issues/6022, https://github.com/bevyengine/bevy/issues/6023, https://github.com/bevyengine/bevy/issues/6024.

## Solution

Added the traits to events in `bevy_input` and `bevy_windows`.  Added dependency of `serde` in `Cargo.toml` of `bevy_input`.


## Migration Guide

If one has been `.clone()`'ing `bevy_input` events, Clippy will now complain about that.  Just remove `.clone()` to solve.

## Other Notes

Some events in `bevy_input` had `f32` fields, so `Eq` trait was not derived for them.
Some events in `bevy_windows` had `String` fields, so `Copy` trait was not derived for them.

Co-authored-by: targrub <62773321+targrub@users.noreply.github.com>

crates/bevy_input/src/gamepad.rs

@@ -68,7 +68,7 @@ impl Gamepads {
 }
 
 /// The data contained in a [`GamepadEvent`] or [`GamepadEventRaw`].
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, Copy, PartialEq)]
 #[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub enum GamepadEventType {
     /// A [`Gamepad`] has been connected.
@@ -101,7 +101,7 @@ pub enum GamepadEventType {
 /// [`Axis<GamepadAxis>`], and [`Axis<GamepadButton>`] resources won't be updated correctly.
 ///
 /// An example for gamepad input mocking can be seen in the documentation of the [`GamepadEventRaw`].
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, Copy, PartialEq)]
 #[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct GamepadEvent {
     /// The gamepad this event corresponds to.
@@ -204,7 +204,7 @@ impl GamepadEvent {
 /// #
 /// # bevy_ecs::system::assert_is_system(change_resource_on_gamepad_button_press);
 /// ```
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, Copy, PartialEq)]
 #[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct GamepadEventRaw {
     /// The gamepad this event corresponds to.
@@ -703,7 +703,7 @@ pub fn gamepad_event_system(
     for event in raw_events.iter() {
         match event.event_type {
             GamepadEventType::Connected => {
-                events.send(GamepadEvent::new(event.gamepad, event.event_type.clone()));
+                events.send(GamepadEvent::new(event.gamepad, event.event_type));
                 for button_type in &ALL_BUTTON_TYPES {
                     let gamepad_button = GamepadButton::new(event.gamepad, *button_type);
                     button_input.reset(gamepad_button);
@@ -714,7 +714,7 @@ pub fn gamepad_event_system(
                 }
             }
             GamepadEventType::Disconnected => {
-                events.send(GamepadEvent::new(event.gamepad, event.event_type.clone()));
+                events.send(GamepadEvent::new(event.gamepad, event.event_type));
                 for button_type in &ALL_BUTTON_TYPES {
                     let gamepad_button = GamepadButton::new(event.gamepad, *button_type);
                     button_input.reset(gamepad_button);

crates/bevy_input/src/keyboard.rs

@@ -11,7 +11,8 @@ use bevy_reflect::{FromReflect, Reflect};
 ///
 /// The event is consumed inside of the [`keyboard_input_system`](crate::keyboard::keyboard_input_system)
 /// to update the [`Input<KeyCode>`](crate::Input<KeyCode>) resource.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct KeyboardInput {
     /// The scan code of the key.
     pub scan_code: u32,

crates/bevy_input/src/mouse.rs

@@ -10,7 +10,8 @@ use bevy_math::Vec2;
 ///
 /// The event is read inside of the [`mouse_button_input_system`](crate::mouse::mouse_button_input_system)
 /// to update the [`Input<MouseButton>`](crate::Input<MouseButton>) resource.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct MouseButtonInput {
     /// The mouse button assigned to the event.
     pub button: MouseButton,
@@ -50,7 +51,8 @@ pub enum MouseButton {
 /// However, the event data does not make it possible to distinguish which device it is referring to.
 ///
 /// [`DeviceEvent::MouseMotion`]: https://docs.rs/winit/latest/winit/event/enum.DeviceEvent.html#variant.MouseMotion
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct MouseMotion {
     /// The change in the position of the pointing device since the last event was sent.
     pub delta: Vec2,
@@ -63,6 +65,7 @@ pub struct MouseMotion {
 /// The value of the event can either be interpreted as the amount of lines or the amount of pixels
 /// to scroll.
 #[derive(Debug, Clone, Copy, Eq, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub enum MouseScrollUnit {
     /// The line scroll unit.
     ///
@@ -79,7 +82,8 @@ pub enum MouseScrollUnit {
 /// A mouse wheel event.
 ///
 /// This event is the translated version of the `WindowEvent::MouseWheel` from the `winit` crate.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct MouseWheel {
     /// The mouse scroll unit.
     pub unit: MouseScrollUnit,

crates/bevy_internal/Cargo.toml

@@ -45,7 +45,7 @@ wav = ["bevy_audio/wav"]
 # Enable watching file system for asset hot reload
 filesystem_watcher = ["bevy_asset/filesystem_watcher"]
 
-serialize = ["bevy_input/serialize"]
+serialize = ["bevy_input/serialize", "bevy_window/serialize"]
 
 # Display server protocol support (X11 is enabled by default)
 wayland = ["bevy_winit/wayland"]

crates/bevy_reflect/src/impls/std.rs

@@ -9,7 +9,8 @@ use crate::{
 
 use crate::utility::{GenericTypeInfoCell, NonGenericTypeInfoCell};
 use bevy_reflect_derive::{impl_from_reflect_value, impl_reflect_value};
-use bevy_utils::{Duration, HashMap, HashSet, Instant};
+use bevy_utils::{Duration, Instant};
+use bevy_utils::{HashMap, HashSet};
 use std::{
     any::Any,
     borrow::Cow,
@@ -889,18 +890,19 @@ mod tests {
         Enum, FromReflect, Reflect, ReflectSerialize, TypeInfo, TypeRegistry, Typed, VariantInfo,
         VariantType,
     };
-    use bevy_utils::{HashMap, Instant};
+    use bevy_utils::HashMap;
+    use bevy_utils::{Duration, Instant};
     use std::f32::consts::{PI, TAU};
 
     #[test]
     fn can_serialize_duration() {
         let mut type_registry = TypeRegistry::default();
-        type_registry.register::<std::time::Duration>();
+        type_registry.register::<Duration>();
 
         let reflect_serialize = type_registry
-            .get_type_data::<ReflectSerialize>(std::any::TypeId::of::<std::time::Duration>())
+            .get_type_data::<ReflectSerialize>(std::any::TypeId::of::<Duration>())
             .unwrap();
-        let _serializable = reflect_serialize.get_serializable(&std::time::Duration::ZERO);
+        let _serializable = reflect_serialize.get_serializable(&Duration::ZERO);
     }
 
     #[test]

crates/bevy_window/Cargo.toml

@@ -8,6 +8,10 @@ repository = "https://github.com/bevyengine/bevy"
 license = "MIT OR Apache-2.0"
 keywords = ["bevy"]
 
+[features]
+default = []
+serialize = ["serde"]
+
 [dependencies]
 # bevy
 bevy_app = { path = "../bevy_app", version = "0.9.0-dev" }
@@ -20,6 +24,7 @@ bevy_input = { path = "../bevy_input", version = "0.9.0-dev" }
 raw-window-handle = "0.4.2"
 
 # other
+serde = { version = "1.0", features = ["derive"], optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 web-sys = "0.3"

crates/bevy_window/src/cursor.rs

@@ -4,6 +4,7 @@
 /// This `enum` is simply a copy of a similar `enum` found in [`winit`](https://docs.rs/winit/latest/winit/window/enum.CursorIcon.html).
 /// `winit`, in turn, mostly copied cursor types available in the browser.
 #[derive(Debug, Hash, PartialEq, Eq, Clone, Copy)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub enum CursorIcon {
     /// The platform-dependent default cursor.
     Default,

crates/bevy_window/src/event.rs

@@ -4,7 +4,8 @@ use super::{WindowDescriptor, WindowId};
 use bevy_math::{IVec2, Vec2};
 
 /// A window event that is sent whenever a window's logical size has changed.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowResized {
     pub id: WindowId,
     /// The new logical width of the window.
@@ -14,7 +15,8 @@ pub struct WindowResized {
 }
 
 /// An event that indicates that a new window should be created.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct CreateWindow {
     pub id: WindowId,
     pub descriptor: WindowDescriptor,
@@ -22,14 +24,16 @@ pub struct CreateWindow {
 
 /// An event that indicates the window should redraw, even if its control flow is set to `Wait` and
 /// there have been no window events.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct RequestRedraw;
 
 /// An event that is sent whenever a new window is created.
 ///
 /// To create a new window, send a [`CreateWindow`] event - this
 /// event will be sent in the handler for that event.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowCreated {
     pub id: WindowId,
 }
@@ -45,7 +49,8 @@ pub struct WindowCreated {
 /// [`WindowPlugin`]: crate::WindowPlugin
 /// [`Window`]: crate::Window
 /// [closing]: crate::Window::close
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowCloseRequested {
     pub id: WindowId,
 }
@@ -54,7 +59,8 @@ pub struct WindowCloseRequested {
 /// handler for [`Window::close`].
 ///
 /// [`Window::close`]: crate::Window::close
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowClosed {
     pub id: WindowId,
 }
@@ -67,7 +73,8 @@ pub struct WindowClosed {
 ///
 /// [`WindowEvent::CursorMoved`]: https://docs.rs/winit/latest/winit/event/enum.WindowEvent.html#variant.CursorMoved
 /// [`MouseMotion`]: bevy_input::mouse::MouseMotion
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct CursorMoved {
     /// The identifier of the window the cursor has moved on.
     pub id: WindowId,
@@ -76,45 +83,51 @@ pub struct CursorMoved {
     pub position: Vec2,
 }
 /// An event that is sent whenever the user's cursor enters a window.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct CursorEntered {
     pub id: WindowId,
 }
 /// An event that is sent whenever the user's cursor leaves a window.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct CursorLeft {
     pub id: WindowId,
 }
 
 /// An event that is sent whenever a window receives a character from the OS or underlying system.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct ReceivedCharacter {
     pub id: WindowId,
     pub char: char,
 }
 
 /// An event that indicates a window has received or lost focus.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct WindowFocused {
     pub id: WindowId,
     pub focused: bool,
 }
 
 /// An event that indicates a window's scale factor has changed.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowScaleFactorChanged {
     pub id: WindowId,
     pub scale_factor: f64,
 }
 /// An event that indicates a window's OS-reported scale factor has changed.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowBackendScaleFactorChanged {
     pub id: WindowId,
     pub scale_factor: f64,
 }
 
 /// Events related to files being dragged and dropped on a window.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub enum FileDragAndDrop {
     DroppedFile { id: WindowId, path_buf: PathBuf },
 
@@ -124,7 +137,8 @@ pub enum FileDragAndDrop {
 }
 
 /// An event that is sent when a window is repositioned in physical pixels.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowMoved {
     pub id: WindowId,
     pub position: IVec2,

crates/bevy_window/src/window.rs

@@ -7,6 +7,7 @@ use raw_window_handle::RawWindowHandle;
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, Reflect, FromReflect)]
 #[reflect_value(PartialEq, Hash)]
 /// A unique ID for a [`Window`].
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowId(Uuid);
 
 /// Presentation mode for a window.
@@ -24,6 +25,7 @@ pub struct WindowId(Uuid);
 /// or updated on a [`Window`](Window::set_present_mode).
 #[repr(C)]
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 #[doc(alias = "vsync")]
 pub enum PresentMode {
     /// Chooses FifoRelaxed -> Fifo based on availability.
@@ -95,7 +97,8 @@ impl Default for WindowId {
 /// Please note that if the window is resizable, then when the window is
 /// maximized it may have a size outside of these limits. The functionality
 /// required to disable maximizing is not yet exposed by winit.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowResizeConstraints {
     pub min_width: f32,
     pub min_height: f32,
@@ -215,6 +218,7 @@ pub struct Window {
 /// Bevy apps don't interact with this `enum` directly. Instead, they should use the methods on [`Window`].
 /// This `enum` is meant for authors of windowing plugins. See the documentation on [`crate::WindowPlugin`] for more information.
 #[derive(Debug)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub enum WindowCommand {
     /// Set the window's [`WindowMode`].
     SetWindowMode {
@@ -288,6 +292,7 @@ pub enum WindowCommand {
 
 /// Defines the way a window is displayed.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub enum WindowMode {
     /// Creates a window that uses the given size.
     Windowed,
@@ -745,7 +750,8 @@ impl Window {
 }
 
 /// Defines where window should be placed at on creation.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub enum WindowPosition {
     /// The position will be set by the window manager.
     Automatic,
@@ -762,7 +768,8 @@ pub enum WindowPosition {
 }
 
 /// Defines which monitor to use.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub enum MonitorSelection {
     /// Uses current monitor of the window.
     ///
@@ -782,7 +789,8 @@ pub enum MonitorSelection {
 /// See [`examples/window/window_settings.rs`] for usage.
 ///
 /// [`examples/window/window_settings.rs`]: https://github.com/bevyengine/bevy/blob/latest/examples/window/window_settings.rs
-#[derive(Resource, Debug, Clone)]
+#[derive(Resource, Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
 pub struct WindowDescriptor {
     /// The requested logical width of the window's client area.
     ///