cranpose_ui_layout/
axis.rs

1/// Represents the primary axis of flex layout (Row or Column).
2///
3/// This enum is used by FlexMeasurePolicy to determine which direction
4/// is the main axis (where children are laid out) and which is the cross axis
5/// (where children are aligned).
6#[derive(Debug, Clone, Copy, PartialEq, Eq)]
7pub enum Axis {
8    /// Horizontal main axis (Row).
9    /// Main axis: left to right
10    /// Cross axis: top to bottom
11    Horizontal,
12
13    /// Vertical main axis (Column).
14    /// Main axis: top to bottom
15    /// Cross axis: left to right
16    Vertical,
17}
18
19impl Axis {
20    /// Returns the opposite axis.
21    #[inline]
22    pub fn cross_axis(self) -> Self {
23        match self {
24            Axis::Horizontal => Axis::Vertical,
25            Axis::Vertical => Axis::Horizontal,
26        }
27    }
28
29    /// Returns true if this is the horizontal axis.
30    #[inline]
31    pub fn is_horizontal(self) -> bool {
32        matches!(self, Axis::Horizontal)
33    }
34
35    /// Returns true if this is the vertical axis.
36    #[inline]
37    pub fn is_vertical(self) -> bool {
38        matches!(self, Axis::Vertical)
39    }
40}
41
42#[cfg(test)]
43mod tests {
44    use super::*;
45
46    #[test]
47    fn an_axis_knows_its_own_direction_and_its_cross_axis() {
48        assert!(Axis::Horizontal.is_horizontal());
49        assert!(!Axis::Horizontal.is_vertical());
50        assert!(Axis::Vertical.is_vertical());
51        assert!(!Axis::Vertical.is_horizontal());
52
53        assert_eq!(Axis::Horizontal.cross_axis(), Axis::Vertical);
54        assert_eq!(Axis::Vertical.cross_axis(), Axis::Horizontal);
55        assert_eq!(Axis::Horizontal.cross_axis().cross_axis(), Axis::Horizontal);
56    }
57}
cranpose_ui_layout/axis.rs

cranpose_ui_layout/
axis.rs
