use {Event, Input};
pub trait ResizeEvent: Sized {
fn from_width_height(w: u32, h: u32, old_event: &Self) -> Option<Self>;
fn resize<U, F>(&self, f: F) -> Option<U> where F: FnMut(u32, u32) -> U;
fn resize_args(&self) -> Option<[u32; 2]> {
self.resize(|x, y| [x, y])
}
}
impl ResizeEvent for Event {
fn from_width_height(w: u32, h: u32, _old_event: &Self) -> Option<Self> {
Some(Event::Input(Input::Resize(w, h)))
}
fn resize<U, F>(&self, mut f: F) -> Option<U>
where F: FnMut(u32, u32) -> U
{
match *self {
Event::Input(Input::Resize(w, h)) => Some(f(w, h)),
_ => None,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_input_resize() {
use super::super::Input;
let e: Event = Input::Resize(0, 0).into();
let x: Option<Event> = ResizeEvent::from_width_height(100, 100, &e);
let y: Option<Event> = x.clone()
.unwrap()
.resize(|w, h| ResizeEvent::from_width_height(w, h, x.as_ref().unwrap()))
.unwrap();
assert_eq!(x, y);
}
}