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use super::*;
/// Where to align something along an axis.
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub enum Align {
/// Align at the start of the axis.
Start,
/// Align in the middle of the axis.
Center,
/// Align at the end of the axis.
End,
/// Align at the left side of the axis.
Left,
/// Align at the right side of the axis.
Right,
/// Align at the top side of the axis.
Top,
/// Align at the bottom side of the axis.
Bottom,
}
impl Align {
/// The axis this alignment belongs to if it is specific.
pub fn axis(self) -> Option<SpecAxis> {
match self {
Self::Start => None,
Self::Center => None,
Self::End => None,
Self::Left => Some(SpecAxis::Horizontal),
Self::Right => Some(SpecAxis::Horizontal),
Self::Top => Some(SpecAxis::Vertical),
Self::Bottom => Some(SpecAxis::Vertical),
}
}
/// The inverse alignment.
pub fn inv(self) -> Self {
match self {
Self::Start => Self::End,
Self::Center => Self::Center,
Self::End => Self::Start,
Self::Left => Self::Right,
Self::Right => Self::Left,
Self::Top => Self::Bottom,
Self::Bottom => Self::Top,
}
}
/// Returns the position of this alignment in the given range.
pub fn resolve(self, dir: Dir, range: Range<Length>) -> Length {
#[cfg(debug_assertions)]
if let Some(axis) = self.axis() {
debug_assert_eq!(axis, dir.axis())
}
match self {
Self::Start => {
if dir.is_positive() {
range.start
} else {
range.end
}
}
Self::Center => (range.start + range.end) / 2.0,
Self::End => {
if dir.is_positive() {
range.end
} else {
range.start
}
}
Self::Left | Self::Top => range.start,
Self::Right | Self::Bottom => range.end,
}
}
}
impl Default for Align {
fn default() -> Self {
Self::Start
}
}
impl Debug for Align {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
f.pad(match self {
Self::Start => "start",
Self::Center => "center",
Self::End => "end",
Self::Left => "left",
Self::Right => "right",
Self::Top => "top",
Self::Bottom => "bottom",
})
}
}
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