Crate cloudiful_bevy_camera 

cloudiful-bevy-camera

Reusable Bevy camera switching core.

What it provides

• CameraSwitchPlugin: registers request handling and switch events
• SwitchableCamera: marker/config component for cameras managed by core
• SwitchCameraRequest: external switch request API
• CameraSwitched: emitted when active switchable camera changes

What it does not provide

• camera spawning or setup helpers
• keyboard or gamepad bindings
• settings, rebind, or device-selection logic
• UI focus gating or project-specific business rules

This crate stays narrow on purpose: project code marks cameras with SwitchableCamera and sends SwitchCameraRequest values.

An optional input_bindings feature adds a minimal Bevy-native input layer. It stays generic on purpose:

• keyboard via ButtonInput<KeyCode>
• optional native gamepad bindings via Bevy Gamepad
• no control-settings resource
• no rebind workflow
• no primary-device selection
• no UI/business-state gating

Participation Rules

Only entities that have both:

• SwitchableCamera
• Camera

participate in switching. A request targeting a plain Camera, a plain SwitchableCamera, or any unrelated entity is ignored.

Stable ordering

Candidates always sort by:

1. order_key
2. slot.unwrap_or(u8::MAX)
3. entity index

That same ordering drives cycle behavior and repeated-slot tie breaking.

Request Semantics

SwitchCameraRequest supports four operations:

• ToEntity(Entity): switch to the matching switchable camera entity
• ToSlot(u8): switch to the first ordered camera with that slot
• CycleNext: move forward through the ordered camera list
• CyclePrev: move backward through the ordered camera list

Behavior details:

• missing targets are a no-op
• cycling with no active camera selects the first ordered candidate
• switching to the already uniquely active camera is a no-op
• if multiple cameras are active, the next valid switch collapses them down to one active camera
• CameraSwitched.previous is Some(entity) only when there was exactly one active camera before the switch
• when a switch request succeeds, the target camera becomes the only active switchable camera

Usage

Core only

use bevy::prelude::*;
use cloudiful_bevy_camera::{
    CameraSwitchPlugin, SwitchCameraRequest, SwitchableCamera,
};

App::new().add_plugins(CameraSwitchPlugin);

fn spawn_camera(commands: &mut Commands) {
    commands.spawn((
        Camera::default(),
        SwitchableCamera {
            slot: Some(1),
            order_key: 10,
        },
    ));
}

fn request_camera(mut requests: MessageWriter<SwitchCameraRequest>) {
    requests.write(SwitchCameraRequest::ToSlot(1));
}

Listen for successful switches:

use bevy::prelude::*;
use cloudiful_bevy_camera::CameraSwitched;

fn observe_switches(mut switched: MessageReader<CameraSwitched>) {
    for event in switched.read() {
        println!("camera changed: {:?} -> {:?}", event.previous, event.current);
    }
}

input_bindings feature

use bevy::prelude::*;
use cloudiful_bevy_camera::{
    CameraGamepadBindings, CameraInputBindings, CameraInputBindingsPlugin,
    CameraSwitchPlugin, SwitchableCamera,
};

App::new()
    .add_plugins((
        CameraSwitchPlugin,
        CameraInputBindingsPlugin,
    ))
    .insert_resource(
        CameraInputBindings::default()
            .bind_slot(KeyCode::Digit1, 1)
            .bind_slot(KeyCode::Digit2, 2)
            .bind_next(KeyCode::KeyE)
            .bind_prev(KeyCode::KeyQ)
            .with_gamepad(
                CameraGamepadBindings::default()
                    .bind_slot(GamepadButton::South, 1)
                    .bind_slot(GamepadButton::East, 2)
                    .bind_next(GamepadButton::RightTrigger)
                    .bind_prev(GamepadButton::LeftTrigger),
            ),
    );

fn spawn_camera(commands: &mut Commands) {
    commands.spawn((
        Camera::default(),
        SwitchableCamera {
            slot: Some(1),
            order_key: 10,
        },
    ));
}

Feature-disabled builds still compile only the core switching API.

CameraInputBindingsPlugin emits SwitchCameraRequest messages from generic keyboard/gamepad bindings before the core switch application runs.

Input-layer details:

• keyboard slot bindings use the first matching just_pressed key
• next and prev are checked after direct slot bindings
• gamepad checks run only if CameraInputBindings.gamepad is configured
• gamepad bindings match any connected gamepad; this feature does not pick a primary device

Structs

CameraGamepadBindingsinput_bindings

Generic Bevy-native input bindings for emitting SwitchCameraRequest values.

CameraInputBindingsinput_bindings

Generic Bevy-native input bindings for emitting SwitchCameraRequest values.

CameraInputBindingsPlugininput_bindings

Generic Bevy-native input bindings for emitting SwitchCameraRequest values.

CameraSlotGamepadBindinginput_bindings

Generic Bevy-native input bindings for emitting SwitchCameraRequest values.

CameraSlotKeyBindinginput_bindings

Generic Bevy-native input bindings for emitting SwitchCameraRequest values.

CameraSwitchPlugin

Plugin that applies SwitchCameraRequest values and emits CameraSwitched.

CameraSwitched

Switch request and switch event messages emitted by CameraSwitchPlugin.

SwitchableCamera

Marker/config component for cameras managed by CameraSwitchPlugin.

Enums

SwitchCameraRequest

Switch request and switch event messages emitted by CameraSwitchPlugin.