bevy_reflect: Update enum derives (bevyengine#5473)

> In draft until bevyengine#4761 is merged. See the relevant commits [here](bevyengine@a85fe94).

---

# Objective

Update enums across Bevy to use the new enum reflection and get rid of `#[reflect_value(...)]` usages.

## Solution

Find and replace all[^1] instances of `#[reflect_value(...)]` on enum types.

---

## Changelog

- Updated all[^1] reflected enums to implement `Enum` (i.e. they are no longer `ReflectRef::Value`)

## Migration Guide
Bevy-defined enums have been updated to implement `Enum` and are not considered value types (`ReflectRef::Value`) anymore. This means that their serialized representations will need to be updated. For example, given the Bevy enum:

```rust
pub enum ScalingMode {
  None,
  WindowSize,
  Auto { min_width: f32, min_height: f32 },
  FixedVertical(f32),
  FixedHorizontal(f32),
}
```

You will need to update the serialized versions accordingly.

```js
// OLD FORMAT
{
  "type": "bevy_render::camera::projection::ScalingMode",
  "value": FixedHorizontal(720),
},

// NEW FORMAT
{
  "type": "bevy_render::camera::projection::ScalingMode",
  "enum": {
    "variant": "FixedHorizontal",
    "tuple": [
      {
        "type": "f32",
        "value": 720,
      },
    ],
  },
},
```

This may also have other smaller implications (such as `Debug` representation), but serialization is probably the most prominent.

[^1]: All enums except `HandleId` as neither `Uuid` nor `AssetPathId` implement the reflection traits

crates/bevy_core_pipeline/src/clear_color.rs

@@ -5,7 +5,7 @@ use bevy_render::{color::Color, extract_resource::ExtractResource};
 use serde::{Deserialize, Serialize};
 
 #[derive(Reflect, Serialize, Deserialize, Clone, Debug, Default)]
-#[reflect_value(Serialize, Deserialize)]
+#[reflect(Serialize, Deserialize)]
 pub enum ClearColorConfig {
     #[default]
     Default,

crates/bevy_core_pipeline/src/core_3d/camera_3d.rs

@@ -23,7 +23,7 @@ pub struct Camera3d {
 
 /// The depth clear operation to perform for the main 3d pass.
 #[derive(Reflect, Serialize, Deserialize, Clone, Debug)]
-#[reflect_value(Serialize, Deserialize)]
+#[reflect(Serialize, Deserialize)]
 pub enum Camera3dDepthLoadOp {
     /// Clear with a specified value.
     /// Note that 0.0 is the far plane due to bevy's use of reverse-z projections.

crates/bevy_render/src/camera/camera.rs

@@ -311,7 +311,7 @@ impl RenderTarget {
 }
 
 #[derive(Debug, Clone, Copy, Default, Reflect, FromReflect, Serialize, Deserialize)]
-#[reflect_value(Serialize, Deserialize)]
+#[reflect(Serialize, Deserialize)]
 pub enum DepthCalculation {
     /// Pythagorean distance; works everywhere, more expensive to compute.
     #[default]

crates/bevy_render/src/camera/projection.rs

@@ -142,14 +142,14 @@ impl Default for PerspectiveProjection {
 
 // TODO: make this a component instead of a property
 #[derive(Debug, Clone, Reflect, FromReflect, Serialize, Deserialize)]
-#[reflect_value(Serialize, Deserialize)]
+#[reflect(Serialize, Deserialize)]
 pub enum WindowOrigin {
     Center,
     BottomLeft,
 }
 
 #[derive(Debug, Clone, Reflect, FromReflect, Serialize, Deserialize)]
-#[reflect_value(Serialize, Deserialize)]
+#[reflect(Serialize, Deserialize)]
 pub enum ScalingMode {
     /// Manually specify left/right/top/bottom values.
     /// Ignore window resizing; the image will stretch.

crates/bevy_text/src/text.rs

@@ -187,7 +187,7 @@ impl Default for TextAlignment {
 
 /// Describes horizontal alignment preference for positioning & bounds.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Reflect, Serialize, Deserialize)]
-#[reflect_value(Serialize, Deserialize)]
+#[reflect(Serialize, Deserialize)]
 pub enum HorizontalAlign {
     /// Leftmost character is immediately to the right of the render position.<br/>
     /// Bounds start from the render position and advance rightwards.
@@ -213,7 +213,7 @@ impl From<HorizontalAlign> for glyph_brush_layout::HorizontalAlign {
 /// Describes vertical alignment preference for positioning & bounds. Currently a placeholder
 /// for future functionality.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Reflect, Serialize, Deserialize)]
-#[reflect_value(Serialize, Deserialize)]
+#[reflect(Serialize, Deserialize)]
 pub enum VerticalAlign {
     /// Characters/bounds start underneath the render position and progress downwards.
     Top,

crates/bevy_ui/src/focus.rs

@@ -33,7 +33,7 @@ use smallvec::SmallVec;
 #[derive(
     Component, Copy, Clone, Default, Eq, PartialEq, Debug, Reflect, Serialize, Deserialize,
 )]
-#[reflect_value(Component, Serialize, Deserialize, PartialEq)]
+#[reflect(Component, Serialize, Deserialize, PartialEq)]
 pub enum Interaction {
     /// The node has been clicked
     Clicked,
@@ -48,7 +48,7 @@ pub enum Interaction {
 #[derive(
     Component, Copy, Clone, Default, Eq, PartialEq, Debug, Reflect, Serialize, Deserialize,
 )]
-#[reflect_value(Component, Serialize, Deserialize, PartialEq)]
+#[reflect(Component, Serialize, Deserialize, PartialEq)]
 pub enum FocusPolicy {
     /// Blocks interaction
     #[default]

crates/bevy_ui/src/ui_node.rs

@@ -21,7 +21,7 @@ pub struct Node {
 
 /// An enum that describes possible types of value in flexbox layout options
 #[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum Val {
     /// No value defined
     #[default]
@@ -142,7 +142,7 @@ impl Default for Style {
 
 /// How items are aligned according to the cross axis
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum AlignItems {
     /// Items are aligned at the start
     FlexStart,
@@ -159,7 +159,7 @@ pub enum AlignItems {
 
 /// Works like [`AlignItems`] but applies only to a single item
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum AlignSelf {
     /// Use the value of [`AlignItems`]
     #[default]
@@ -180,7 +180,7 @@ pub enum AlignSelf {
 ///
 /// It only applies if [`FlexWrap::Wrap`] is present and if there are multiple lines of items.
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum AlignContent {
     /// Each line moves towards the start of the cross axis
     FlexStart,
@@ -203,7 +203,7 @@ pub enum AlignContent {
 ///
 /// For example English is written LTR (left-to-right) while Arabic is written RTL (right-to-left).
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum Direction {
     /// Inherit from parent node
     #[default]
@@ -218,7 +218,7 @@ pub enum Direction {
 ///
 /// Part of the [`Style`] component.
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum Display {
     /// Use Flexbox layout model to determine the position of this [`Node`].
     #[default]
@@ -232,7 +232,7 @@ pub enum Display {
 
 /// Defines how flexbox items are ordered within a flexbox
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum FlexDirection {
     /// Same way as text direction along the main axis
     #[default]
@@ -247,7 +247,7 @@ pub enum FlexDirection {
 
 /// Defines how items are aligned according to the main axis
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum JustifyContent {
     /// Pushed towards the start
     #[default]
@@ -266,7 +266,7 @@ pub enum JustifyContent {
 
 /// Whether to show or hide overflowing items
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Reflect, Serialize, Deserialize)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum Overflow {
     /// Show overflowing items
     #[default]
@@ -277,7 +277,7 @@ pub enum Overflow {
 
 /// The strategy used to position this node
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum PositionType {
     /// Relative to all other nodes with the [`PositionType::Relative`] value
     #[default]
@@ -290,7 +290,7 @@ pub enum PositionType {
 
 /// Defines if flexbox items appear on a single line or on multiple lines
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize, Reflect)]
-#[reflect_value(PartialEq, Serialize, Deserialize)]
+#[reflect(PartialEq, Serialize, Deserialize)]
 pub enum FlexWrap {
     /// Single line, will overflow if needed
     #[default]

crates/bevy_ui/src/widget/image.rs

@@ -13,7 +13,7 @@ use serde::{Deserialize, Serialize};
 
 /// Describes how to resize the Image node
 #[derive(Component, Debug, Default, Clone, Reflect, Serialize, Deserialize)]
-#[reflect_value(Component, Serialize, Deserialize)]
+#[reflect(Component, Serialize, Deserialize)]
 pub enum ImageMode {
     /// Keep the aspect ratio of the image
     #[default]