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Implement reactive-rendering for canvas

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This commit is contained in:
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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52
examples/game_of_life/src/main.rs
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@ -193,8 +193,9 @@ mod grid {
use iced::mouse;
use iced::touch;
use iced::widget::canvas;
use iced::widget::canvas::event::{self, Event};
use iced::widget::canvas::{Cache, Canvas, Frame, Geometry, Path, Text};
use iced::widget::canvas::{
Cache, Canvas, Event, Frame, Geometry, Path, Text,
};
use iced::{
Color, Element, Fill, Point, Rectangle, Renderer, Size, Theme, Vector,
};
@ -383,14 +384,12 @@ mod grid {
event: Event,
bounds: Rectangle,
cursor: mouse::Cursor,
) -> (event::Status, Option<Message>) {
) -> Option<canvas::Action<Message>> {
if let Event::Mouse(mouse::Event::ButtonReleased(_)) = event {
*interaction = Interaction::None;
}
let Some(cursor_position) = cursor.position_in(bounds) else {
return (event::Status::Ignored, None);
};
let cursor_position = cursor.position_in(bounds)?;
let cell = Cell::at(self.project(cursor_position, bounds.size()));
let is_populated = self.state.contains(&cell);
@ -413,7 +412,12 @@ mod grid {
populate.or(unpopulate)
};
(event::Status::Captured, message)
Some(
message
.map(canvas::Action::publish)
.unwrap_or(canvas::Action::request_redraw())
.and_capture(),
)
}
Event::Mouse(mouse_event) => match mouse_event {
mouse::Event::ButtonPressed(button) => {
@ -438,7 +442,12 @@ mod grid {
_ => None,
};
(event::Status::Captured, message)
Some(
message
.map(canvas::Action::publish)
.unwrap_or(canvas::Action::request_redraw())
.and_capture(),
)
}
mouse::Event::CursorMoved { .. } => {
let message = match *interaction {
@ -454,12 +463,14 @@ mod grid {
Interaction::None => None,
};
let event_status = match interaction {
Interaction::None => event::Status::Ignored,
_ => event::Status::Captured,
};
let action = message
.map(canvas::Action::publish)
.unwrap_or(canvas::Action::request_redraw());
(event_status, message)
Some(match interaction {
Interaction::None => action,
_ => action.and_capture(),
})
}
mouse::Event::WheelScrolled { delta } => match delta {
mouse::ScrollDelta::Lines { y, .. }
@ -496,18 +507,21 @@ mod grid {
None
};
(
event::Status::Captured,
Some(Message::Scaled(scaling, translation)),
Some(
canvas::Action::publish(Message::Scaled(
scaling,
translation,
))
.and_capture(),
)
} else {
(event::Status::Captured, None)
Some(canvas::Action::capture())
}
}
},
_ => (event::Status::Ignored, None),
_ => None,
},
_ => (event::Status::Ignored, None),
_ => None,
}
}