Struct Core 

pub struct Core {
    pub tree: Tree,
    pub caches: WidgetCaches,
    pub active_subscriptions: HashMap<String, String>,
    pub default_text_size: Option<f32>,
    pub default_font: Option<Font>,
    pub cached_theme: Option<Theme>,
    /* private fields */
}

Pure state core, decoupled from the iced runtime.

Owns the retained UI tree, widget caches, active subscriptions, and global rendering defaults. The host calls apply with each incoming message and executes the returned CoreEffects.

Fields

tree: Tree

The retained UI tree (snapshots replace it, patches update it).

caches: WidgetCaches

Caches for stateful widgets (text_editor content, markdown items, etc.).

active_subscriptions: HashMap<String, String>

Active event subscriptions: kind -> tag.

default_text_size: Option<f32>

Global default text size from Settings.

default_font: Option<Font>

Global default font from Settings.

cached_theme: Option<Theme>

Cached resolved theme from the root node’s theme prop. Only re-resolved when the raw JSON value changes.

Implementations

impl Core

pub fn new() -> Self

pub fn tree_hash(&self) -> String

Compute a SHA-256 hash of the current tree (serialized as JSON). Returns the hex-encoded hash string, or an empty string if no tree.

pub fn apply(&mut self, message: IncomingMessage) -> Vec<CoreEffect>

Process an incoming message, mutate state, return effects.

Trait Implementations

impl Default for Core

fn default() -> Self

Returns the “default value” for a type.