input/
text.rs

1use std::borrow::ToOwned;
2
3use crate::{Event, Input};
4
5/// When receiving text from user, such as typing a character.
6pub trait TextEvent: Sized {
7    /// Creates a text event.
8    ///
9    /// Preserves time stamp from original input event, if any.
10    fn from_text(text: &str, old_event: &Self) -> Option<Self>;
11    /// Calls closure if this is a text event.
12    fn text<U, F>(&self, f: F) -> Option<U>
13    where
14        F: FnMut(&str) -> U;
15    /// Returns text arguments.
16    fn text_args(&self) -> Option<String> {
17        self.text(|text| text.to_owned())
18    }
19}
20
21impl TextEvent for Event {
22    fn from_text(text: &str, old_event: &Self) -> Option<Self> {
23        let timestamp = if let Event::Input(_, x) = old_event {
24            *x
25        } else {
26            None
27        };
28        Some(Event::Input(Input::Text(text.into()), timestamp))
29    }
30
31    fn text<U, F>(&self, mut f: F) -> Option<U>
32    where
33        F: FnMut(&str) -> U,
34    {
35        match *self {
36            Event::Input(Input::Text(ref s), _) => Some(f(s)),
37            _ => None,
38        }
39    }
40}
41
42#[cfg(test)]
43mod tests {
44    use super::*;
45
46    #[test]
47    fn test_input_text() {
48        use super::super::Input;
49
50        let e: Event = Input::Text("".to_string()).into();
51        let x: Option<Event> = TextEvent::from_text("hello", &e);
52        let y: Option<Event> = x
53            .clone()
54            .unwrap()
55            .text(|text| TextEvent::from_text(text, x.as_ref().unwrap()))
56            .unwrap();
57        assert_eq!(x, y);
58    }
59}
input/text.rs

input/
text.rs
