fission_core/ui/widgets/
align.rs

1use crate::internal::InternalLower;
2use crate::lowering::{InternalIrBuilder, InternalLoweringCx};
3use crate::ui::Widget;
4use fission_ir::{LayoutOp, Op, WidgetId};
5use serde::{Deserialize, Serialize};
6
7/// Centers its child within the available parent space.
8///
9/// `Align` is a convenience wrapper that applies center alignment on both
10/// axes. It expands to fill the parent and places the child at the centre.
11///
12/// # Example
13///
14/// ```rust,ignore
15/// Align::new(Text::new("Centered!"))
16/// ```
17#[derive(Debug, Clone, Serialize, Deserialize)]
18pub struct Align {
19    /// Explicit node identity.
20    pub id: Option<WidgetId>,
21    /// The child widget to center.
22    pub child: Widget,
23}
24
25impl Align {
26    pub fn new(child: impl Into<Widget>) -> Self {
27        Self {
28            child: child.into(),
29            id: None,
30        }
31    }
32}
33
34impl InternalLower for Align {
35    fn lower(&self, cx: &mut InternalLoweringCx) -> WidgetId {
36        let id = self.id.map(Into::into).unwrap_or_else(|| cx.next_node_id());
37        cx.push_scope(id);
38        let child_id = self.child.lower(cx);
39        cx.pop_scope();
40
41        let mut builder = InternalIrBuilder::new(id, Op::Layout(LayoutOp::Align));
42        builder.add_child(child_id);
43        builder.build(cx)
44    }
45}
fission_core/ui/widgets/align.rs

fission_core/ui/widgets/
align.rs
