Struct Canvas 

pub struct Canvas { /* private fields */ }

Available on crate feature winio only.

A simple drawing canvas.

Implementations

impl Canvas

pub fn context(&mut self) -> Result<DrawingContext<'_>, Error>

Create the DrawingContext of the current canvas.

Trait Implementations

impl AsWidget for Canvas

fn as_widget(&self) -> BorrowedWidget<'_>

Get the widget handle.

impl Component for Canvas

type Error = Error

The error type.

type Event = CanvasEvent

The output event type to the parent.

type Init<'a> = BorrowedContainer<'a>

Initial parameter type.

type Message = CanvasMessage

The input message type to update.

async fn init( init: <Canvas as Component>::Init<'_>, _sender: &ComponentSender<Canvas>, ) -> Result<Canvas, Error>

Create the initial component.

async fn start(&mut self, sender: &ComponentSender<Canvas>) -> !

Start the event listening.

async fn update( &mut self, message: Self::Message, sender: &ComponentSender<Self>, ) -> Result<bool, Self::Error>

Respond to the message. Return true if need render.

fn render(&mut self, sender: &ComponentSender<Self>) -> Result<(), Self::Error>

Render the widgets.

async fn update_children(&mut self) -> Result<bool, Self::Error>

Update the children components. Return true if any child needs render.

fn render_children(&mut self) -> Result<(), Self::Error>

Render the children components. It will be called if any child or self needs render.

impl Debug for Canvas

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

Formats the value using the given formatter.

impl Enable for Canvas

fn is_enabled(&self) -> Result<bool, Error>

If the widget is enabled.

fn set_enabled(&mut self, v: bool) -> Result<(), Error>

Set if the widget is enabled.

fn enable(&mut self) -> Result<(), Self::Error>

Enable the widget.

fn disable(&mut self) -> Result<(), Self::Error>

Disable the widget.

impl Failable for Canvas

type Error = Error

The error type associated.

impl Layoutable for Canvas

fn loc(&self) -> Result<Point2D<f64, LogicalSpace>, Error>

The left top location.

fn set_loc(&mut self, p: Point2D<f64, LogicalSpace>) -> Result<(), Error>

Move the location.

fn size(&self) -> Result<Size2D<f64, LogicalSpace>, Error>

The size.

fn set_size(&mut self, v: Size2D<f64, LogicalSpace>) -> Result<(), Error>

Resize.

fn rect(&self) -> Result<Rect<f64, LogicalSpace>, Self::Error>

The bounding rectangle.

fn set_rect(&mut self, r: Rect<f64, LogicalSpace>) -> Result<(), Self::Error>

Set the location and size.

fn preferred_size(&self) -> Result<Size2D<f64, LogicalSpace>, Self::Error>

The preferred size.

fn min_size(&self) -> Result<Size2D<f64, LogicalSpace>, Self::Error>

Min acceptable size.

impl ToolTip for Canvas

fn tooltip(&self) -> Result<String, Error>

Get the tooltip text of the widget.

fn set_tooltip(&mut self, s: impl AsRef<str>) -> Result<(), Error>

Set the tooltip text of the widget.

impl Visible for Canvas

fn is_visible(&self) -> Result<bool, Error>

If the widget is visible.

fn set_visible(&mut self, v: bool) -> Result<(), Error>

Set the visibility.

fn show(&mut self) -> Result<(), Self::Error>

Show the widget.

fn hide(&mut self) -> Result<(), Self::Error>

Hide the widget.