rosace_layout/
sizing.rs

1//! [`Width`] and [`Height`] sizing enumerations for declarative widget sizing.
2
3use rosace_core::render_object::AxisBound;
4
5/// How a widget sizes itself on the *horizontal* axis.
6#[derive(Debug, Clone)]
7pub enum Width {
8    /// Exactly `f32` logical pixels wide.
9    Fixed(f32),
10    /// Expand to fill all available width.
11    Fill,
12    /// Shrink to fit intrinsic content width.
13    Shrink,
14    /// A fraction `0.0–1.0` of the parent's available width.
15    Fraction(f32),
16    /// At least `f32` pixels wide; may grow larger.
17    Min(f32),
18    /// At most `f32` pixels wide; may be smaller.
19    Max(f32),
20    /// Clamped between `(min, max)` pixels.
21    Range(f32, f32),
22}
23
24/// How a widget sizes itself on the *vertical* axis.
25#[derive(Debug, Clone)]
26pub enum Height {
27    /// Exactly `f32` logical pixels tall.
28    Fixed(f32),
29    /// Expand to fill all available height.
30    Fill,
31    /// Shrink to fit intrinsic content height.
32    Shrink,
33    /// A fraction `0.0–1.0` of the parent's available height.
34    Fraction(f32),
35    /// At least `f32` pixels tall; may grow larger.
36    Min(f32),
37    /// At most `f32` pixels tall; may be smaller.
38    Max(f32),
39    /// Clamped between `(min, max)` pixels.
40    Range(f32, f32),
41}
42
43impl Width {
44    /// Convert to an [`AxisBound`] given the parent's `available` width in logical pixels.
45    pub fn to_axis_bound(&self, available: f32) -> AxisBound {
46        match self {
47            Width::Fixed(v) => AxisBound::Bounded(*v),
48            Width::Fill => AxisBound::Bounded(available),
49            Width::Shrink => AxisBound::Shrink,
50            Width::Fraction(f) => AxisBound::Bounded(available * f),
51            Width::Min(v) => AxisBound::Bounded(*v),
52            Width::Max(v) => AxisBound::Bounded(*v),
53            Width::Range(_, max) => AxisBound::Bounded(*max),
54        }
55    }
56}
57
58impl Height {
59    /// Convert to an [`AxisBound`] given the parent's `available` height in logical pixels.
60    pub fn to_axis_bound(&self, available: f32) -> AxisBound {
61        match self {
62            Height::Fixed(v) => AxisBound::Bounded(*v),
63            Height::Fill => AxisBound::Bounded(available),
64            Height::Shrink => AxisBound::Shrink,
65            Height::Fraction(f) => AxisBound::Bounded(available * f),
66            Height::Min(v) => AxisBound::Bounded(*v),
67            Height::Max(v) => AxisBound::Bounded(*v),
68            Height::Range(_, max) => AxisBound::Bounded(*max),
69        }
70    }
71}
rosace_layout/sizing.rs

rosace_layout/
sizing.rs
