Struct LayoutState 

pub struct LayoutState { /* private fields */ }

Retained layout state for a LayoutNode. This mirrors Jetpack Compose’s approach where each node stores its own measured size and placed position, eliminating the need for per-frame LayoutTree reconstruction.

Implementations

impl LayoutState

pub fn size(&self) -> Size

pub fn position(&self) -> Point

pub fn content_offset(&self) -> Point

Offset of the content box relative to the node origin (e.g. due to padding).

pub fn set_content_offset(&mut self, offset: Point)

Writes the content offset, reporting an actual change to the semantics tree.

pub fn at_origin(self) -> Self

The same state placed at the origin: what a window root’s own scene starts from, since the position its parent gave it belongs to the parent’s window.

pub fn is_placed(&self) -> bool

pub fn set_size(&mut self, size: Size)

Writes the measured size, self-reporting an actual change to the scene phase.

pub fn place(&mut self, position: Point)

Writes the placed position and marks the node placed, self-reporting an actual move to the scene phase, and a placement of a node the scene does not draw: one the running pass did not find placed.

pub fn clear_placed(&mut self)

Clears the placed flag at the start of a layout pass. Until its parent places it again the pass counts the node unplaced, and the pass names it to the scene phase if it ends that way.

Trait Implementations

impl Clone for LayoutState

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LayoutState

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for LayoutState

fn default() -> Self

Returns the “default value” for a type.