Function side_bar_provider 

pub fn side_bar_provider(
    args: SideBarProviderArgs,
    state: Arc<RwLock<SideBarProviderState>>,
    main_content: impl FnOnce() + Send + Sync + 'static,
    side_bar_content: impl FnOnce() + Send + Sync + 'static,
)

Renders a side bar UI group, managing its animation, scrim, keyboard handling and content.

This is the primary function to create a side bar. Call it inside a component that owns or has access to the application’s shared state. The provider renders the main content first, then the scrim (overlay) and the side bar when the state indicates visibility.

Arguments

• args: Configuration options including the on_close_request callback and visual style. See SideBarProviderArgs.
• state: Shared state controlling open/closed animation timing. See SideBarProviderState.
• main_content: Closure rendering the always-visible main UI (background for the side bar).
• side_bar_content: Closure rendering the side bar’s content.

The provider registers a keyboard handler that invokes the provided on_close_request when the Escape key is pressed. Clicking the scrim also triggers the same callback.