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use std::cmp::min;
use XY;
use vec::Vec2;
pub type Position = XY<Offset>;
impl Position {
pub fn center() -> Self {
Position::new(Offset::Center, Offset::Center)
}
pub fn absolute<T: Into<Vec2>>(offset: T) -> Self {
let offset = offset.into();
Position::new(Offset::Absolute(offset.x), Offset::Absolute(offset.y))
}
pub fn parent<T: Into<Vec2>>(offset: T) -> Self {
let offset = offset.into();
Position::new(Offset::Parent(offset.x), Offset::Parent(offset.y))
}
pub fn compute_offset(&self, size: Vec2, available: Vec2, parent: Vec2)
-> Vec2 {
Vec2::new(self.x.compute_offset(size.x, available.x, parent.x),
self.y.compute_offset(size.y, available.y, parent.y))
}
}
#[derive(PartialEq,Debug,Clone)]
pub enum Offset {
Center,
Absolute(usize),
Parent(usize),
}
impl Offset {
pub fn compute_offset(&self, size: usize, available: usize, parent: usize)
-> usize {
if size > available {
0
} else {
match *self {
Offset::Center => (available - size) / 2,
Offset::Absolute(offset) => min(offset, available - size),
Offset::Parent(offset) => {
min(parent + offset, available - size)
}
}
}
}
}