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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/multitouch/src/main.rs
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@ -3,9 +3,8 @@
//! computers like Microsoft Surface.
use iced::mouse;
use iced::touch;
use iced::widget::canvas::event;
use iced::widget::canvas::stroke::{self, Stroke};
use iced::widget::canvas::{self, Canvas, Geometry};
use iced::widget::canvas::{self, Canvas, Event, Geometry};
use iced::{Color, Element, Fill, Point, Rectangle, Renderer, Theme};
use std::collections::HashMap;
@ -56,25 +55,25 @@ impl canvas::Program<Message> for Multitouch {
fn update(
&self,
_state: &mut Self::State,
event: event::Event,
event: Event,
_bounds: Rectangle,
_cursor: mouse::Cursor,
) -> (event::Status, Option<Message>) {
match event {
event::Event::Touch(touch_event) => match touch_event {
) -> Option<canvas::Action<Message>> {
let message = match event {
Event::Touch(
touch::Event::FingerPressed { id, position }
| touch::Event::FingerMoved { id, position } => (
event::Status::Captured,
Some(Message::FingerPressed { id, position }),
),
| touch::Event::FingerMoved { id, position },
) => Some(Message::FingerPressed { id, position }),
Event::Touch(
touch::Event::FingerLifted { id, .. }
| touch::Event::FingerLost { id, .. } => (
event::Status::Captured,
Some(Message::FingerLifted { id }),
),
},
_ => (event::Status::Ignored, None),
}
| touch::Event::FingerLost { id, .. },
) => Some(Message::FingerLifted { id }),
_ => None,
};
message
.map(canvas::Action::publish)
.map(canvas::Action::and_capture)
}
fn draw(