Struct ListFace 

pub struct ListFace<'a> { /* private fields */ }

The list’s painting and measuring, without the widget around it.

A painting app can use this directly when it wants the list’s geometry and mechanics but its own chrome around them.

Implementations

impl<'a> ListFace<'a>

pub fn new( lines: &'a [ConversationLine], clock: ConversationClock, ) -> ListFace<'a>

pub fn height(&self, text: &mut TextRenderer, theme: &Theme, width: f64) -> f64

The list’s height at width, keeping nothing between calls.

pub fn height_in( &self, cache: &mut ListCache, text: &mut TextRenderer, theme: &Theme, width: f64, ) -> f64

The list’s height at width, reusing what cache measured last time.

A height does not depend on where the rows start, so this answers from the kept rows wherever a last frame placed them, and places them only when the conversation or the column changed.

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

Paint the list from rect’s top left, rect’s width wide, keeping nothing between frames.

pub fn paint_in( &self, paint: &mut PaintCtx<'_>, rect: Rect, viewport: Option<Rect>, cache: &mut ListCache, )

Paint the rows of rect that meet viewport — all of them when it is None — reusing and keeping cache’s measurements.

A row outside the viewport is neither measured again (its kept box is still right) nor shaped: the frame costs what is on screen, not what the conversation holds.