Struct Canvas 

pub struct Canvas { /* private fields */ }

LVGL canvas — a widget backed by a user-supplied pixel buffer.

The caller must keep the buffer alive for the lifetime of the widget. Buffer size is w * h * bytes_per_pixel(cf).

Initial cut exposes buffer setup, background fill, per-pixel writes, and the layer init/finish dance that LVGL 9 requires for draw operations. draw_rect/arc/label wrappers can be added later.

Implementations

impl Canvas

pub fn create(parent: impl Widget) -> Self

Create a new Canvas widget as a child of parent.

pub fn fill_bg(self, color: Color, opa: u8) -> Self

Fill the entire canvas with the given colour and opacity.

pub fn set_pixel(self, x: i32, y: i32, color: Color) -> Self

Set a single pixel to the given colour.

pub fn raw_obj(self) -> *mut lv_obj_t

Returns the raw lv_obj_t * for low-level canvas operations (e.g. passing to lv_canvas_init_layer / draw descriptor calls from other crates).

pub fn init_layer(self, layer: *mut lv_layer_t) -> Self

Fluent: initialise a draw layer bound to this canvas. Pair with Canvas::finish_layer around low-level draw operations.

pub fn finish_layer(self, layer: *mut lv_layer_t) -> Self

Fluent: flush a draw layer previously opened with Canvas::init_layer, committing its draw tasks to the canvas.

impl Canvas

pub fn set_buffer(self, buf: CanvasBuffer<'_>) -> Self

Safe replacement for the legacy Canvas::buffer — accepts a typed CanvasBuffer borrowed for at least as long as the canvas is used.

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 Deref for Canvas

type Target = Obj

The resulting type after dereferencing.

fn deref(&self) -> &Obj

Dereferences the value.

impl Widget for Canvas

fn raw(self) -> *mut lv_obj_t

Return the raw lv_obj_t pointer for this widget.

impl Copy for Canvas

impl Send for Canvas

impl Sync for Canvas