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Implement event capturing for Canvas

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This commit is contained in:
Héctor Ramón Jiménez 2020-11-12 01:24:59 +01:00
parent bf6c65b5ad
commit 3aca177132
5 changed files with 98 additions and 66 deletions
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71
examples/bezier_tool/src/main.rs
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@ -69,7 +69,8 @@ impl Sandbox for Example {
mod bezier {
use iced::{
canvas::{self, Canvas, Cursor, Event, Frame, Geometry, Path, Stroke},
canvas::event::{self, Event},
canvas::{self, Canvas, Cursor, Frame, Geometry, Path, Stroke},
mouse, Element, Length, Point, Rectangle,
};
@ -109,41 +110,51 @@ mod bezier {
event: Event,
bounds: Rectangle,
cursor: Cursor,
) -> Option<Curve> {
let cursor_position = cursor.position_in(&bounds)?;
) -> (event::Status, Option<Curve>) {
let cursor_position =
if let Some(position) = cursor.position_in(&bounds) {
position
} else {
return (event::Status::Ignored, None);
};
match event {
Event::Mouse(mouse_event) => match mouse_event {
mouse::Event::ButtonPressed(mouse::Button::Left) => {
match self.state.pending {
None => {
self.state.pending = Some(Pending::One {
from: cursor_position,
});
None
}
Some(Pending::One { from }) => {
self.state.pending = Some(Pending::Two {
from,
to: cursor_position,
});
Event::Mouse(mouse_event) => {
let message = match mouse_event {
mouse::Event::ButtonPressed(mouse::Button::Left) => {
match self.state.pending {
None => {
self.state.pending = Some(Pending::One {
from: cursor_position,
});
None
}
Some(Pending::Two { from, to }) => {
self.state.pending = None;
None
}
Some(Pending::One { from }) => {
self.state.pending = Some(Pending::Two {
from,
to: cursor_position,
});
Some(Curve {
from,
to,
control: cursor_position,
})
None
}
Some(Pending::Two { from, to }) => {
self.state.pending = None;
Some(Curve {
from,
to,
control: cursor_position,
})
}
}
}
}
_ => None,
},
_ => None,
_ => None,
};
(event::Status::Captured, message)
}
_ => (event::Status::Ignored, None),
}
}