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Fix EventTrigger::has_tag

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This commit is contained in:
Alexandre Bury 2020-05-23 18:51:59 -07:00
parent ec10145bf2
commit f8d34b8c52
1 changed files with 28 additions and 4 deletions
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32
cursive-core/src/event.rs
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@ -39,8 +39,18 @@ pub struct EventTrigger {
tag: Box<dyn AnyTag>,
}
trait AnyTag: Any + std::fmt::Debug {}
impl<T> AnyTag for T where T: Any + std::fmt::Debug {}
trait AnyTag: Any + std::fmt::Debug {
fn as_any(&self) -> &dyn Any;
}
impl<T> AnyTag for T
where
T: Any + std::fmt::Debug,
{
fn as_any(&self) -> &dyn Any {
&*self
}
}
impl EventTrigger {
/// Create a new `EventTrigger` using the given function as filter.
@ -57,15 +67,29 @@ impl EventTrigger {
F: 'static + Fn(&Event) -> bool,
T: Any + std::fmt::Debug,
{
let tag = Box::new(tag);
EventTrigger {
trigger: Box::new(f),
tag: Box::new(tag),
tag: tag,
}
}
/// Check if this trigger has the given tag.
///
/// # Examples
///
/// ```rust
/// use cursive_core::event::{Event, EventTrigger};
///
/// let event = Event::CtrlChar('c');
/// let trigger: EventTrigger = event.clone().into();
/// assert!(trigger.has_tag(&event), "Trigger does not recognize its own tag.");
/// ```
pub fn has_tag<T: PartialEq + 'static>(&self, tag: &T) -> bool {
Any::downcast_ref::<T>(&self.tag).map_or(false, |t| tag == t)
(*self.tag)
.as_any()
.downcast_ref::<T>()
.map_or(false, |t| tag == t)
}
/// Checks if this trigger applies to the given `Event`.