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|
//! Listen to keyboard events.
use crate::core;
use crate::core::keyboard::{Event, Key, Modifiers};
use crate::subscription::{self, Subscription};
use crate::MaybeSend;
/// Listens to keyboard key presses and calls the given function
/// map them into actual messages.
///
/// If the function returns `None`, the key press will be simply
/// ignored.
pub fn on_key_press<Message>(
f: fn(Key, Modifiers) -> Option<Message>,
) -> Subscription<Message>
where
Message: MaybeSend + 'static,
{
#[derive(Hash)]
struct OnKeyPress;
subscription::filter_map((OnKeyPress, f), move |event, status, _window| {
match (event, status) {
(
core::Event::Keyboard(Event::KeyPressed {
key, modifiers, ..
}),
core::event::Status::Ignored,
) => f(key, modifiers),
_ => None,
}
})
}
/// Listens to keyboard key releases and calls the given function
/// map them into actual messages.
///
/// If the function returns `None`, the key release will be simply
/// ignored.
pub fn on_key_release<Message>(
f: fn(Key, Modifiers) -> Option<Message>,
) -> Subscription<Message>
where
Message: MaybeSend + 'static,
{
#[derive(Hash)]
struct OnKeyRelease;
subscription::filter_map(
(OnKeyRelease, f),
move |event, status, _window| match (event, status) {
(
core::Event::Keyboard(Event::KeyReleased {
key,
modifiers,
..
}),
core::event::Status::Ignored,
) => f(key, modifiers),
_ => None,
},
)
}
|
