Struct Canvas 

pub struct Canvas { /* private fields */ }

A finite drawing surface and its ordered, owned frame items.

Implementations

impl Canvas

pub const fn new() -> Self

pub fn sizing(self, sizing: CanvasSizing) -> Self

Replaces this Canvas’s complete sizing policy.

Ordinary callers use viewport sizing. Built-in presentations may bind an opaque intrinsic value internally; sizing remains independent of the Canvas’s ordered items in either case.

pub const fn width(self, width: usize) -> Self

States viewport sizing’s extent on an unbounded width axis.

Panics

Panics when a crate-provided intrinsic sizing value is already installed.

pub const fn height(self, height: usize) -> Self

States viewport sizing’s extent on an unbounded height axis.

Panics

Panics when a crate-provided intrinsic sizing value is already installed.

pub const fn extent(self, size: Size) -> Self

States both unbounded-axis extents of viewport sizing.

Panics

Panics when a crate-provided intrinsic sizing value is already installed.

pub fn item<T>(self, item: T) -> Self

where T: CanvasItem + Clone + PartialEq,

Appends one owned item to the frame’s drawing order.

pub fn items<T>(&self) -> impl Iterator<Item = &T>

where T: CanvasItem + Clone + PartialEq,

Returns the directly owned items whose concrete type is T.

This is the typed extension boundary for an adapter that owns a CanvasItem implementation. Core layout remains unaware of that item’s meaning; the adapter can recover its own immutable values from a composed Canvas without exposing Any or a fallible downcast.

Trait Implementations

impl Clone for Canvas

fn clone(&self) -> Canvas

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Canvas

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

Formats the value using the given formatter.

impl Default for Canvas

fn default() -> Canvas

Returns the “default value” for a type.

impl PartialEq for Canvas

fn eq(&self, other: &Canvas) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Canvas