chargrid_common/
align.rs

1use chargrid_core::*;
2
3#[derive(Debug, Clone, Copy)]
4pub enum AlignmentX {
5    Left,
6    Centre,
7    Right,
8}
9
10#[derive(Debug, Clone, Copy)]
11pub enum AlignmentY {
12    Top,
13    Centre,
14    Bottom,
15}
16
17#[derive(Debug, Clone, Copy)]
18pub struct Alignment {
19    pub x: AlignmentX,
20    pub y: AlignmentY,
21}
22
23impl Alignment {
24    pub fn centre() -> Self {
25        Self {
26            x: AlignmentX::Centre,
27            y: AlignmentY::Centre,
28        }
29    }
30}
31
32pub struct Align<C: Component> {
33    pub component: C,
34    pub alignment: Alignment,
35}
36
37impl<C: Component> Align<C> {
38    pub fn centre(component: C) -> Self {
39        Self {
40            component,
41            alignment: Alignment::centre(),
42        }
43    }
44    fn child_ctx<'a>(&self, state: &C::State, ctx: Ctx<'a>) -> Ctx<'a> {
45        let size = self.component.size(state, ctx);
46        let ctx_size = ctx.bounding_box.size();
47        let x_offset = match self.alignment.x {
48            AlignmentX::Left => 0,
49            AlignmentX::Centre => (ctx_size.x() as i32 - size.x() as i32) / 2,
50            AlignmentX::Right => ctx_size.x() as i32 - size.x() as i32,
51        };
52        let y_offset = match self.alignment.y {
53            AlignmentY::Top => 0,
54            AlignmentY::Centre => (ctx_size.y() as i32 - size.y() as i32) / 2,
55            AlignmentY::Bottom => ctx_size.y() as i32 - size.y() as i32,
56        };
57        ctx.add_offset(Coord::new(x_offset, y_offset))
58    }
59}
60
61impl<C: Component> Component for Align<C> {
62    type Output = C::Output;
63    type State = C::State;
64    fn render(&self, state: &Self::State, ctx: Ctx, fb: &mut FrameBuffer) {
65        self.component.render(state, self.child_ctx(state, ctx), fb);
66    }
67    fn update(&mut self, state: &mut Self::State, ctx: Ctx, event: Event) -> Self::Output {
68        self.component
69            .update(state, self.child_ctx(state, ctx), event)
70    }
71    fn size(&self, state: &Self::State, ctx: Ctx) -> Size {
72        self.component.size(state, self.child_ctx(state, ctx))
73    }
74}
chargrid_common/align.rs

chargrid_common/
align.rs
