[go: up one dir, main page]

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 receiving text from user, such as typing a character
pub trait TextEvent {
    /// Creates a text event.
    fn from_text(text: &str) -> Option<Self>;
    /// Calls closure if this is a text event.
    fn text<U>(&self, f: |&str| -> U) -> Option<U>;
}

impl<T: GenericEvent> TextEvent for T {
    #[inline(always)]
    fn from_text(text: &str) -> Option<T> {
        let id = TypeId::of::<Box<TextEvent>>();
        Ptr::with_str::<Option<T>>(text, |ptr| {
            GenericEvent::from_event(id, ptr)
        })
    }

    #[inline(always)]
    fn text<U>(&self, f: |&str| -> U) -> Option<U> {
        let id = TypeId::of::<Box<TextEvent>>();
        self.with_event(id, |ptr| {
            f(ptr.expect_str())
        })
    }
}