Struct Cached 

pub struct Cached {
    pub rect: Rect,
    pub visible: bool,
    /* private fields */
}

A component with memoized geometry, its last placed rectangle, and any in-flight property transitions.

Fields

rect: Rect

Last outer rectangle assigned by layout.

visible: bool

Whether the component participates in layout, paint, and focus.

Implementations

impl Cached

pub fn new(comp: Box<dyn Component>) -> Self

Wraps a component with empty geometry caches.

pub fn measure(&mut self, ctx: &UiContext) -> (u16, u16)

Returns memoized outer width bounds, including padding and border.

The process-wide width epoch and the context revision are part of the memo key, so changing the terminal’s Jamo policy or swapping the presentation context remeasures unchanged component trees.

pub fn height(&mut self, ctx: &UiContext, width: u16) -> u16

Returns memoized outer height at width, including padding and border.

pub fn place(&mut self, ctx: &UiContext, rect: Rect)

Stores the outer rectangle and places children inside its content box.

A lift component rests at the bottom of its rectangle; the reserved headroom above is where the chrome rises while hovered.

pub fn paint(&mut self, pc: &mut PaintCtx<'_>)

Paints border and content, then restores this component’s background.

When anim/spin properties are live, sampled solid colors are swapped into the props for the duration of this call and restored afterward, so content and chrome both paint the mid-flight value. Hover chrome follows the pointer or keyboard focus: a ramped hover under a live pointer renders as a tracking glow over the resting chrome, under keyboard focus it blooms from the chrome’s center until it blankets the ring, every other hovered case swaps into the border slot, and lift raises the chrome into the headroom its rectangle reserves, leaving a shadow.

pub const fn invalidate(&mut self)

Invalidates both geometry memos.

pub fn update<R>( &mut self, slot: Slot, f: impl FnOnce(&mut Self) -> (R, bool), ) -> Option<R>

Mutates a component selected by slot and invalidates a dirty ancestor path.

pub fn update_id<R>( &mut self, id: &str, f: impl FnOnce(&mut Self) -> (R, bool), ) -> Option<R>

Mutates a component selected by id and invalidates a dirty ancestor path.

pub fn find_slot(&mut self, slot: Slot) -> Option<&mut Self>

Finds a component by slot without invalidating geometry.

pub fn comp(&self) -> &dyn Component

Borrows the wrapped component.

pub fn comp_mut(&mut self) -> &mut dyn Component

Borrows the wrapped component mutably; callers must invalidate after mutation.

Trait Implementations

impl IntoChildren for Cached

fn extend_children(self, out: &mut Vec<Cached>)

Appends all represented children to out.