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use crate::*;
pub enum HAlignment {
Leading,
Center,
Trailing,
}
pub fn align_h(child: LocalRect, parent: LocalRect, align: HAlignment) -> LocalOffset {
let c_off = parent.center() - child.center();
match align {
HAlignment::Leading => [parent.min_x() - child.min_x(), c_off.y].into(),
HAlignment::Center => c_off,
HAlignment::Trailing => [parent.max_x() - child.max_x(), c_off.y].into(),
}
}
pub enum VAlignment {
Top,
Middle,
Bottom,
}
pub fn align_v(child: LocalRect, parent: LocalRect, align: VAlignment) -> LocalOffset {
let c_off = parent.center() - child.center();
match align {
VAlignment::Top => [c_off.x, parent.max_y() - child.max_y()].into(),
VAlignment::Middle => c_off,
VAlignment::Bottom => [c_off.x, parent.min_y() - child.min_y()].into(),
}
}
pub fn align(
child: LocalRect,
parent: LocalRect,
halign: HAlignment,
valign: VAlignment,
) -> LocalOffset {
let c_off = parent.center() - child.center();
LocalOffset::new(
match halign {
HAlignment::Leading => parent.min_x() - child.min_x(),
HAlignment::Center => c_off.x,
HAlignment::Trailing => parent.max_x() - child.max_x(),
},
match valign {
VAlignment::Top => parent.max_y() - child.max_y(),
VAlignment::Middle => c_off.y,
VAlignment::Bottom => parent.min_y() - child.min_y(),
},
)
}
#[cfg(test)]
mod tests {
use super::*;
fn rect<A, B>(origin: A, size: B) -> LocalRect
where
A: Into<LocalPoint>,
B: Into<LocalSize>,
{
LocalRect::new(origin.into(), size.into())
}
#[test]
fn test_align_h() {
let parent = rect([0.0, 0.0], [10.0, 10.0]);
let off = align_h(rect([0.0, 0.0], [1.0, 1.0]), parent, HAlignment::Center);
assert_eq!(off.x, 4.5);
assert_eq!(off.y, 4.5);
let off = align_h(rect([0.0, 0.0], [1.0, 1.0]), parent, HAlignment::Leading);
assert_eq!(off.x, 0.0);
assert_eq!(off.y, 4.5);
let off = align_h(rect([0.0, 0.0], [1.0, 1.0]), parent, HAlignment::Trailing);
assert_eq!(off.x, 9.0);
assert_eq!(off.y, 4.5);
}
#[test]
fn test_align_v() {
let parent = rect([0.0, 0.0], [10.0, 10.0]);
let off = align_v(rect([0.0, 0.0], [1.0, 1.0]), parent, VAlignment::Middle);
assert_eq!(off.x, 4.5);
assert_eq!(off.y, 4.5);
let off = align_v(rect([0.0, 0.0], [1.0, 1.0]), parent, VAlignment::Bottom);
assert_eq!(off.x, 4.5);
assert_eq!(off.y, 0.0);
let off = align_v(rect([0.0, 0.0], [1.0, 1.0]), parent, VAlignment::Top);
assert_eq!(off.x, 4.5);
assert_eq!(off.y, 9.0);
}
#[test]
fn test_align() {
let parent = rect([0.0, 0.0], [10.0, 10.0]);
let off = align(
rect([0.0, 0.0], [1.0, 1.0]),
parent,
HAlignment::Center,
VAlignment::Middle,
);
assert_eq!(off.x, 4.5);
assert_eq!(off.y, 4.5);
let off = align(
rect([0.0, 0.0], [1.0, 1.0]),
parent,
HAlignment::Leading,
VAlignment::Bottom,
);
assert_eq!(off.x, 0.0);
assert_eq!(off.y, 0.0);
}
}