[−][src]Trait iced::widget::canvas::Program

pub trait Program<Message> {
    fn draw(&self, bounds: Rectangle<f32>, cursor: Cursor) -> Vec<Geometry>;

    fn update(
        &mut self, 
        _event: Event, 
        _bounds: Rectangle<f32>, 
        _cursor: Cursor
    ) -> Option<Message> { ... }

    fn mouse_interaction(
        &self, 
        _bounds: Rectangle<f32>, 
        _cursor: Cursor
    ) -> Interaction { ... }
}
This is supported on feature="canvas" or feature="glow_canvas" only.

The state and logic of a Canvas.

A Program can mutate internal state and produce messages for an application.

Required methods

fn draw(&self, bounds: Rectangle<f32>, cursor: Cursor) -> Vec<Geometry>

This is supported on feature="canvas" or feature="glow_canvas" only.

Draws the state of the Program, producing a bunch of Geometry.

Geometry can be easily generated with a Frame or stored in a Cache.

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Provided methods

fn update(
    &mut self,
    _event: Event,
    _bounds: Rectangle<f32>,
    _cursor: Cursor
) -> Option<Message>

This is supported on feature="canvas" or feature="glow_canvas" only.

Updates the state of the Program.

When a Program is used in a Canvas, the runtime will call this method for each Event.

This method can optionally return a Message to notify an application of any meaningful interactions.

By default, this method does and returns nothing.

fn mouse_interaction(
    &self,
    _bounds: Rectangle<f32>,
    _cursor: Cursor
) -> Interaction

This is supported on feature="canvas" or feature="glow_canvas" only.

Returns the current mouse interaction of the Program.

The interaction returned will be in effect even if the cursor position is out of bounds of the program's Canvas.

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Implementations on Foreign Types

impl<'_, T, Message> Program<Message> for &'_ mut T where
    T: Program<Message>, [src]

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Implementors

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