rui/views/
canvas.rs

1use crate::*;
2
3/// Struct for `canvas`
4#[derive(Clone)]
5pub struct Canvas<F> {
6    func: F,
7}
8
9impl<F> View for Canvas<F>
10where
11    F: Fn(&mut Context, LocalRect, &mut Vger) + 'static,
12{
13    fn draw(&self, id: ViewId, args: &mut DrawArgs) {
14        let rect = args.cx.layout.entry(id).or_default().rect;
15
16        args.vger.save();
17        (self.func)(args.cx, rect, args.vger);
18        args.vger.restore();
19    }
20
21    fn layout(&self, id: ViewId, args: &mut LayoutArgs) -> LocalSize {
22        args.cx.layout.insert(
23            id,
24            LayoutBox {
25                rect: LocalRect::new(LocalPoint::zero(), args.sz),
26                offset: LocalOffset::zero(),
27            },
28        );
29        args.sz
30    }
31
32    fn hittest(&self, id: ViewId, pt: LocalPoint, cx: &mut Context) -> Option<ViewId> {
33        let rect = cx.layout.entry(id).or_default().rect;
34
35        if rect.contains(pt) {
36            Some(id)
37        } else {
38            None
39        }
40    }
41
42    fn gc(&self, id: ViewId, _cx: &mut Context, map: &mut Vec<ViewId>) {
43        map.push(id);
44    }
45}
46
47/// Canvas for GPU drawing with Vger. See https://github.com/audulus/vger-rs.
48pub fn canvas<F: Fn(&mut Context, LocalRect, &mut Vger) + 'static>(f: F) -> impl View {
49    Canvas { func: f }
50}
51
52impl<F> private::Sealed for Canvas<F> {}
rui/views/canvas.rs

rui/views/
canvas.rs
