pistoncore-event 0.0.1

A library for flexible generic event threading
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

use std::intrinsics::TypeId;

use GenericEvent;
use ptr::Ptr;

/// When window gets or looses focus
pub trait FocusEvent {
    /// Creates a focus event.
    fn from_focused(focused: bool) -> Option<Self>;
    /// Calls closure if this is a focus event.
    fn focus<U>(&self, f: |bool| -> U) -> Option<U>;
}

impl<T: GenericEvent> FocusEvent for T {
    #[inline(always)]
    fn from_focused(focused: bool) -> Option<T> {
        let id = TypeId::of::<Box<FocusEvent>>();
        Ptr::with_ref::<bool, Option<T>>(&focused, |ptr| {
            GenericEvent::from_event(id, ptr)
        })
    }

    #[inline(always)]
    fn focus<U>(&self, f: |bool| -> U) -> Option<U> {
        let id = TypeId::of::<Box<FocusEvent>>();
        self.with_event(id, |ptr| {
            f(*ptr.expect::<bool>())
        })
    }
}