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Implement reactive-rendering for canvas

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Héctor Ramón Jiménez 2024-10-28 16:58:00 +01:00
parent a84b328dcc
commit 920596ed6f
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GPG key ID: 4C07CEC81AFA161F
9 changed files with 243 additions and 141 deletions
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33
examples/sierpinski_triangle/src/main.rs
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@ -1,6 +1,5 @@
use iced::mouse;
use iced::widget::canvas::event::{self, Event};
use iced::widget::canvas::{self, Canvas, Geometry};
use iced::widget::canvas::{self, Canvas, Event, Geometry};
use iced::widget::{column, row, slider, text};
use iced::{Center, Color, Fill, Point, Rectangle, Renderer, Size, Theme};
@ -80,26 +79,22 @@ impl canvas::Program<Message> for SierpinskiGraph {
event: Event,
bounds: Rectangle,
cursor: mouse::Cursor,
) -> (event::Status, Option<Message>) {
let Some(cursor_position) = cursor.position_in(bounds) else {
return (event::Status::Ignored, None);
};
) -> Option<canvas::Action<Message>> {
let cursor_position = cursor.position_in(bounds)?;
match event {
Event::Mouse(mouse_event) => {
let message = match mouse_event {
iced::mouse::Event::ButtonPressed(
iced::mouse::Button::Left,
) => Some(Message::PointAdded(cursor_position)),
iced::mouse::Event::ButtonPressed(
iced::mouse::Button::Right,
) => Some(Message::PointRemoved),
_ => None,
};
(event::Status::Captured, message)
}
_ => (event::Status::Ignored, None),
Event::Mouse(mouse::Event::ButtonPressed(button)) => match button {
mouse::Button::Left => Some(canvas::Action::publish(
Message::PointAdded(cursor_position),
)),
mouse::Button::Right => {
Some(canvas::Action::publish(Message::PointRemoved))
}
_ => None,
},
_ => None,
}
.map(canvas::Action::and_capture)
}
fn draw(