Struct Renderer 

pub struct Renderer<W: Write> {
    pub writer: W,
    pub rng: Box<dyn Rng>,
    /* private fields */
}

Bundles writer, RNG, per-frame context, and current panel for rendering.

Created once at wizard startup. Per-frame context is updated via frame(), which scopes each render pass. The active LayoutPanel is set by draw().

Fields

writer: W

rng: Box<dyn Rng>

Implementations

impl<W: Write> Renderer<W>

pub fn new(writer: W, rng: Box<dyn Rng>, ctx: RenderContext) -> Self

pub fn ctx(&self) -> &RenderContext

pub fn panel(&self) -> LayoutPanel

pub fn frame<F>(&mut self, ctx: RenderContext, f: F) -> Result<()>

where F: FnOnce(&mut Self) -> Result<()>,

Scope a render frame: update the context, clear the screen, run f, then flush.

Analogous to the shellops with_cursor pattern — scoped mutation with a single point of context update.

pub fn draw( &mut self, component: &impl Component, panel: LayoutPanel, ) -> Result<u16>

Set the active panel and render a component.

pub fn with_panel<F>(&mut self, f: F) -> Result<u16>

where F: FnOnce(&mut W, LayoutPanel, &mut Box<dyn Rng>) -> Result<u16>,

Destructure the renderer for a component render at the active panel.

Positions the cursor, then passes writer, panel, and RNG to the closure. The panel is read from the renderer (set by draw).