Struct Loader 

pub struct Loader { /* private fields */ }

Loader component with optional spinning animation. Port of pi’s packages/tui/src/components/loader.ts.

pi’s Loader extends Text. In rab we wrap Text via composition.

Implementations

impl Loader

pub fn new( spinner_color_fn: Style, message_color_fn: Style, message: impl Into<String>, ) -> Self

pub fn start(&mut self)

pub fn stop(&mut self)

pub fn set_message(&mut self, message: impl Into<String>)

pub fn set_indicator(&mut self, indicator: LoaderIndicatorOptions)

pub fn tick(&mut self) -> bool

Advance to next frame if interval elapsed. Returns true if display changed.

Trait Implementations

impl Component for Loader

fn render(&mut self, width: usize) -> Vec<String>

Render to lines for the given viewport width. Each returned string MUST NOT exceed width in visible width.

fn handle_input(&mut self, _key: &KeyEvent) -> bool

Handle keyboard input. Return true if consumed.

fn invalidate(&mut self)

Mark this component as needing re-render. Called when internal state changes (output received, expanded toggled, etc.).

fn render_padded(&mut self, width: usize) -> Vec<String>

Render and pad each line to exactly width visible columns. Default implementation calls render(width) and pads each line with trailing spaces if its visible width is less than width.

fn handle_paste(&mut self, _text: &str)

Handle a paste event (text from bracketed paste mode). Default no-op; override to process pasted content.

fn is_dirty(&self) -> bool

Check if this component needs re-render. Default: false — the Container’s per-child cache tracking determines whether to re-render. Override to return true for components whose state can change without explicit invalidation (e.g. ToolExecComponent receiving streaming output).

fn clear_dirty(&mut self)

Clear dirty flag after successful render.

fn cache_key(&self, _width: usize) -> Option<RenderCacheKey>

Get the cache key for this component’s current state. Return None to disable caching (always re-render).

fn get_cached_render(&self) -> Option<&RenderCache>

Get cached render output, if available and valid.

fn set_cached_render(&mut self, _cache: RenderCache)

Store render output in cache.

fn is_focusable(&self) -> bool

Whether this component wants focus (for IME cursor positioning).

fn set_expanded(&mut self, _expanded: bool)

Toggle expanded/collapsed state. No-op by default. Override for components that support expand/collapse (tool results, messages, etc.).

fn set_hide_thinking(&mut self, _hide: bool)

Toggle thinking block visibility. No-op by default. Override for components that display thinking content (AssistantMessageComponent).