Struct SceneManager 

pub struct SceneManager { /* private fields */ }

Manages scene registration, transitions, and lifecycle.

Implementations

impl SceneManager

Implements static scene creation for SceneManager.

pub fn create_scene<T>(scene: T) -> SceneRc

where T: Scene + 'static,

Creates a new SceneRc wrapping the given scene in a reference-counted cell.

Arguments

• T - The concrete scene type implementing Scene.

Returns

• SceneRc - The wrapped scene.

impl SceneManager

Implements scene registration and lifecycle management for SceneManager.

pub fn register(&mut self, name: String, scene: SceneRc)

Registers a scene under the given name.

Arguments

• String - The name to register the scene under.
• SceneRc - The scene to register.

pub fn unregister<N>(&mut self, name: N)

where N: AsRef<str>,

Unregisters and removes the scene with the given name.

Arguments

• N: AsRef<str> - The name of the scene to remove.

pub fn switch_to<N>(&mut self, name: N) -> bool

where N: AsRef<str>,

Transitions to the scene with the given name.

Calls on_exit on the current scene and on_enter on the new scene. Returns false if no scene with the given name is registered.

Arguments

• N: AsRef<str> - The name of the scene to switch to.

Returns

• bool - True if the transition was successful.

pub fn request_transition(&mut self, name: String)

Requests a deferred scene transition to be applied on the next update.

Arguments

• String - The name of the scene to switch to.

pub fn process_pending_transition(&mut self)

Processes a pending scene transition if one was requested.

pub fn update(&mut self, delta_time: f64)

Calls on_update on the current scene.

Arguments

• f64 - The delta time in seconds.

pub fn render(&mut self, context: &CanvasRenderingContext2d)

Calls on_render on the current scene, recording into the shared draw list.

The manager’s reusable DrawList is cleared, filled by the scene, and left populated for the caller to replay (e.g. via CanvasRenderer::replay). Reusing the list avoids per-frame allocation.

Arguments

• &CanvasRenderingContext2d - The canvas rendering context used to replay the recorded commands.

pub fn has_scene<N>(&self, name: N) -> bool

where N: AsRef<str>,

Returns whether a scene with the given name is registered.

Arguments

• N: AsRef<str> - The scene name to check.

Returns

• bool - True if the scene is registered.

pub fn current_name(&self) -> Option<&str>

Returns the name of the currently active scene.

Returns

• Option<&str> - The current scene name, or None.

impl SceneManager

pub fn new() -> Self

Trait Implementations

impl Clone for SceneManager

fn clone(&self) -> SceneManager

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for SceneManager

Implements Default for SceneManager as a new empty manager.

fn default() -> SceneManager

Returns the “default value” for a type.

impl Updatable for SceneManager

Forwards SceneManager::update through the Updatable trait so that scene managers can be driven alongside entities, animators, and physics worlds in a single homogeneous update loop.

The inherent SceneManager::update method is the canonical implementation; this impl exists purely for trait dispatch. The inherent call resolves first when both are in scope, so there is no recursion.

fn update(&mut self, delta_time: f64)

Advance the object’s internal state by the given delta time.