Struct LayoutCtx 

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

Context passed to Widget::layout, carrying the text-shaping context and theme type-erased so frust-core depends on neither frust-text nor frust-theme.

Implementations

impl<'a> LayoutCtx<'a>

pub fn new() -> LayoutCtx<'static>

Create a layout context with no shared resources (leaf unit tests).

pub fn with_text_context(text_ctx: &'a mut dyn Any) -> Self

Create a layout context carrying the shared text-shaping context.

pub fn with_resources( text_ctx: Option<&'a mut dyn Any>, theme: Option<&'a dyn Any>, ) -> Self

Create a layout context carrying an optional text context and theme.

pub fn with_theme(self, theme: &'a dyn Any) -> Self

Attach the app’s active theme, type-erased.

pub fn text_context<T: Any>(&mut self) -> &mut T

Recover the text-shaping context as &mut T; panics if absent or of another type (a wiring bug).

pub fn theme_as<T: Any>(&self) -> Option<&T>

Recover the theme as &T, or None if absent or of another type.

pub fn window_insets(&self) -> WindowInsets

The window insets for this pass, possibly narrowed by an ancestor.

pub fn with_window_insets<R>( &mut self, insets: WindowInsets, f: impl FnOnce(&mut Self) -> R, ) -> R

Run f with insets as the window insets, then restore them (how SafeArea removes consumed edges); a panic in f skips the restore.

pub fn window_size(&self) -> Size

The window’s logical size (Size::ZERO before the first root layout); overlay pods are laid out against it, not their owner’s box.

pub fn layout_epoch(&self) -> u64

The root’s global layout epoch for this pass; 0 outside a root.

pub fn is_forced(&self) -> bool

Whether this pass ignores layout caches (true without a render root).

Trait Implementations

impl Default for LayoutCtx<'static>

fn default() -> Self

Returns the “default value” for a type.