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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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76
examples/bezier_tool/src/main.rs
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@ -57,8 +57,9 @@ impl Example {
mod bezier {
use iced::mouse;
use iced::widget::canvas::event::{self, Event};
use iced::widget::canvas::{self, Canvas, Frame, Geometry, Path, Stroke};
use iced::widget::canvas::{
self, Canvas, Event, Frame, Geometry, Path, Stroke,
};
use iced::{Element, Fill, Point, Rectangle, Renderer, Theme};
#[derive(Default)]
@ -96,48 +97,47 @@ mod bezier {
event: Event,
bounds: Rectangle,
cursor: mouse::Cursor,
) -> (event::Status, Option<Curve>) {
let Some(cursor_position) = cursor.position_in(bounds) else {
return (event::Status::Ignored, None);
};
) -> Option<canvas::Action<Curve>> {
let cursor_position = cursor.position_in(bounds)?;
match event {
Event::Mouse(mouse_event) => {
let message = match mouse_event {
mouse::Event::ButtonPressed(mouse::Button::Left) => {
match *state {
None => {
*state = Some(Pending::One {
from: cursor_position,
});
Event::Mouse(mouse::Event::ButtonPressed(
mouse::Button::Left,
)) => Some(
match *state {
None => {
*state = Some(Pending::One {
from: cursor_position,
});
None
}
Some(Pending::One { from }) => {
*state = Some(Pending::Two {
from,
to: cursor_position,
});
None
}
Some(Pending::Two { from, to }) => {
*state = None;
Some(Curve {
from,
to,
control: cursor_position,
})
}
}
canvas::Action::request_redraw()
}
_ => None,
};
Some(Pending::One { from }) => {
*state = Some(Pending::Two {
from,
to: cursor_position,
});
(event::Status::Captured, message)
canvas::Action::request_redraw()
}
Some(Pending::Two { from, to }) => {
*state = None;
canvas::Action::publish(Curve {
from,
to,
control: cursor_position,
})
}
}
.and_capture(),
),
Event::Mouse(mouse::Event::CursorMoved { .. })
if state.is_some() =>
{
Some(canvas::Action::request_redraw())
}
_ => (event::Status::Ignored, None),
_ => None,
}
}