Struct LifecycleConfig 

pub struct LifecycleConfig {
    pub on_close: Vec<Box<dyn FnMut(&mut dyn UiCtx) + Send + Sync>>,
    pub on_resize: Vec<Box<dyn FnMut(&mut dyn UiCtx) + Send + Sync>>,
    pub on_focus: Vec<Box<dyn FnMut(&mut dyn UiCtx) + Send + Sync>>,
}

Lifecycle callbacks handed to a BackendRunner at startup.

Each field is the exact hook vector registered on the crate::App via crate::App::on_close / crate::App::on_resize / crate::App::on_focus. Backends fire these against a NullUiCtx when the matching window event fires, because lifecycle events happen outside a live drawing frame (there is no EguiUiCtx / IcedUiCtx bound at that point).

The size / focus values that drive the event stream are consumed by the LifecycleTracker for change-detection; the hooks themselves take the established FnMut(&mut dyn UiCtx) shape. A future typed-argument lifecycle API (passing the new size / focus state into the hook) is out of scope for this release.

Fields

on_close: Vec<Box<dyn FnMut(&mut dyn UiCtx) + Send + Sync>>

Hooks fired once when the window is closing.

on_resize: Vec<Box<dyn FnMut(&mut dyn UiCtx) + Send + Sync>>

Hooks fired whenever the window size changes.

on_focus: Vec<Box<dyn FnMut(&mut dyn UiCtx) + Send + Sync>>

Hooks fired whenever the window gains or loses focus.

Trait Implementations

impl Default for LifecycleConfig

fn default() -> LifecycleConfig

Returns the “default value” for a type.