Struct CanvasStore 

pub struct CanvasStore { /* private fields */ }

Shared canvas store — holds all active canvases.

Thread-safe and cheaply cloneable (wraps Arc).

Implementations

impl CanvasStore

pub fn new() -> Self

pub fn render( &self, canvas_id: &str, content_type: &str, content: &str, ) -> Option<CanvasFrame>

Push a new frame to a canvas. Creates the canvas if it does not exist. Returns None if the maximum canvas count has been reached and this is a new canvas.

pub fn snapshot(&self, canvas_id: &str) -> Option<CanvasFrame>

Get the current (most recent) frame for a canvas.

pub fn history(&self, canvas_id: &str) -> Vec<CanvasFrame>

Get the frame history for a canvas.

pub fn clear(&self, canvas_id: &str) -> bool

Clear a canvas (removes current content and history).

pub fn subscribe(&self, canvas_id: &str) -> Option<Receiver<CanvasFrame>>

Subscribe to real-time updates for a canvas. Creates the canvas entry if it does not exist (subject to canvas count limit). Returns None if the canvas does not exist and the limit has been reached.

pub fn list(&self) -> Vec<String>

List all canvas IDs that currently have content.

Trait Implementations

impl Clone for CanvasStore

fn clone(&self) -> CanvasStore

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for CanvasStore

fn default() -> Self

Returns the “default value” for a type.