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use std::collections::HashMap;
use Cursive;
use event::{Callback, Event, EventResult};
use view::{View, ViewWrapper};
/// A simple wrapper view that catches some ignored event from its child.
///
/// If the event doesn't have a corresponding callback, it will stay ignored.
///
/// # Examples
///
/// ```
/// # use cursive::prelude::*;
/// let view = KeyEventView::new(TextView::new("This view has an event!"))
/// .register('q', |s| s.quit())
/// .register(Key::Esc, |s| s.quit());
/// ```
pub struct KeyEventView {
content: Box<View>,
callbacks: HashMap<Event, Callback>,
}
impl KeyEventView {
/// Wraps the given view in a new KeyEventView.
pub fn new<V: View + 'static>(view: V) -> Self {
KeyEventView {
content: Box::new(view),
callbacks: HashMap::new(),
}
}
/// Registers a callback when the given key is ignored by the child.
pub fn register<F, E: Into<Event>>(mut self, event: E, cb: F) -> Self
where F: Fn(&mut Cursive) + 'static
{
self.callbacks.insert(event.into(), Callback::from_fn(cb));
self
}
}
impl ViewWrapper for KeyEventView {
wrap_impl!(self.content);
fn wrap_on_event(&mut self, event: Event) -> EventResult {
match self.content.on_event(event) {
EventResult::Ignored => {
match self.callbacks.get(&event) {
None => EventResult::Ignored,
Some(cb) => EventResult::Consumed(Some(cb.clone())),
}
}
res => res,
}
}
}