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use Event;
use Input;
#[derive(Copy, Clone, PartialEq, Debug)]
pub struct AfterRenderArgs;
pub trait AfterRenderEvent: Sized {
fn from_after_render_args(args: &AfterRenderArgs, old_event: &Self) -> Option<Self>;
fn after_render<U, F>(&self, f: F) -> Option<U>
where F: FnMut(&AfterRenderArgs) -> U;
fn after_render_args(&self) -> Option<AfterRenderArgs> {
self.after_render(|args| args.clone())
}
}
impl AfterRenderEvent for Input {
fn from_after_render_args(_args: &AfterRenderArgs, _old_event: &Input) -> Option<Self> {
None
}
fn after_render<U, F>(&self, mut _f: F) -> Option<U>
where F: FnMut(&AfterRenderArgs) -> U
{
None
}
}
impl<I> AfterRenderEvent for Event<I> {
fn from_after_render_args(args: &AfterRenderArgs, _old_event: &Event<I>) -> Option<Self> {
Some(Event::AfterRender(*args))
}
fn after_render<U, F>(&self, mut f: F) -> Option<U>
where F: FnMut(&AfterRenderArgs) -> U
{
match *self {
Event::AfterRender(ref args) => Some(f(args)),
_ => None
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_event_after_render() {
use Event;
use AfterRenderArgs;
let e = Event::AfterRender(AfterRenderArgs);
let x: Option<Event> = AfterRenderEvent::from_after_render_args(
&AfterRenderArgs, &e);
let y: Option<Event> = x.clone().unwrap().after_render(|args|
AfterRenderEvent::from_after_render_args(args, x.as_ref().unwrap())).unwrap();
assert_eq!(x, y);
}
}