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#[derive(Copy, Clone, PartialEq, Debug)]
pub enum Alignment {
Start,
Center,
End,
Stretch,
}
impl Default for Alignment {
fn default() -> Self {
Alignment::Stretch
}
}
impl Alignment {
pub fn align_position(
self,
available_measure: f64,
measure: f64,
margin_start: f64,
margin_end: f64,
) -> f64 {
match self {
Alignment::End => available_measure - measure - margin_end,
Alignment::Center => (available_measure - measure) / 2.0,
_ => margin_start,
}
}
pub fn align_measure(
self,
available_measure: f64,
measure: f64,
margin_start: f64,
margin_end: f64,
) -> f64 {
match self {
Alignment::Stretch => available_measure - margin_start - margin_end,
_ => measure,
}
}
}
impl From<&str> for Alignment {
fn from(t: &str) -> Self {
match t {
"End" | "end" => Alignment::End,
"Center" | "center" => Alignment::Center,
"Start" | "start" => Alignment::Start,
_ => Alignment::Stretch,
}
}
}
#[cfg(test)]
mod tests {
use crate::prelude::*;
#[test]
fn test_align_position() {
let available_measure = 100.0;
let measure = 50.0;
let alignment = Alignment::Stretch;
assert_eq!(
alignment.align_position(available_measure, measure, 0.0, 0.0),
0.0
);
let alignment = Alignment::Center;
assert_eq!(
alignment.align_position(available_measure, measure, 0.0, 0.0),
25.0
);
let alignment = Alignment::Start;
assert_eq!(
alignment.align_position(available_measure, measure, 0.0, 0.0),
0.0
);
let alignment = Alignment::End;
assert_eq!(
alignment.align_position(available_measure, measure, 0.0, 0.0),
50.0
);
}
#[test]
fn test_align_measure() {
let available_measure = 100.0;
let measure = 50.0;
let alignment = Alignment::Stretch;
assert_eq!(
alignment.align_measure(available_measure, measure, 0.0, 0.0),
available_measure
);
let alignment = Alignment::Center;
assert_eq!(
alignment.align_measure(available_measure, measure, 0.0, 0.0),
measure
);
let alignment = Alignment::Start;
assert_eq!(
alignment.align_measure(available_measure, measure, 0.0, 0.0),
measure
);
let alignment = Alignment::End;
assert_eq!(
alignment.align_measure(available_measure, measure, 0.0, 0.0),
measure
);
}
#[test]
fn test_into() {
let alignment: Alignment = "start".into();
assert_eq!(alignment, Alignment::Start);
let alignment: Alignment = "start".into();
assert_eq!(alignment, Alignment::Start);
let alignment: Alignment = "Center".into();
assert_eq!(alignment, Alignment::Center);
let alignment: Alignment = "center".into();
assert_eq!(alignment, Alignment::Center);
let alignment: Alignment = "end".into();
assert_eq!(alignment, Alignment::End);
let alignment: Alignment = "end".into();
assert_eq!(alignment, Alignment::End);
let alignment: Alignment = "Stretch".into();
assert_eq!(alignment, Alignment::Stretch);
let alignment: Alignment = "stretch".into();
assert_eq!(alignment, Alignment::Stretch);
let alignment: Alignment = "other".into();
assert_eq!(alignment, Alignment::Stretch);
}
}