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use std::fmt;
use webcore::value::Reference;
use webcore::try_from::TryInto;
use webcore::reference_type::ReferenceType;
use webapi::event::{ConcreteEvent, IEvent};
use private::TODO;
/// A handle to a particular event listener.
pub struct EventListenerHandle {
event_type: &'static str,
reference: Reference,
listener_reference: Reference
}
impl fmt::Debug for EventListenerHandle {
fn fmt( &self, formatter: &mut fmt::Formatter ) -> fmt::Result {
write!( formatter, "EventListenerHandle {{ event_type: {}, reference: {:?} }}", self.event_type, self.reference )
}
}
impl EventListenerHandle {
/// Removes the handler from the [IEventTarget](trait.IEventTarget.html) on
/// which it was previously registered.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener)
// https://dom.spec.whatwg.org/#ref-for-dom-eventtarget-removeeventlistener%E2%91%A0
pub fn remove( self ) {
js! { @(no_return)
var self = @{self.reference};
var event_type = @{self.event_type};
var listener = @{self.listener_reference};
listener.drop();
self.removeEventListener( event_type, listener );
}
}
}
/// `IEventTarget` is an interface implemented by objects that
/// can receive events and may have listeners for them.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget)
// https://dom.spec.whatwg.org/#eventtarget
pub trait IEventTarget: ReferenceType {
/// Adds given event handler to the list the list of event listeners for
/// the specified `EventTarget` on which it's called.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener)
// https://dom.spec.whatwg.org/#ref-for-dom-eventtarget-addeventlistener%E2%91%A0
fn add_event_listener< T, F >( &self, listener: F ) -> EventListenerHandle
where T: ConcreteEvent, F: FnMut( T ) + 'static
{
let reference = self.as_ref();
let listener_reference = js! {
var listener = @{listener};
@{reference}.addEventListener( @{T::EVENT_TYPE}, listener );
return listener;
}.try_into().unwrap();
EventListenerHandle {
event_type: T::EVENT_TYPE,
reference: reference.clone(),
listener_reference: listener_reference
}
}
/// Dispatches an `Event` at this `EventTarget`, invoking the affected event listeners in the
/// appropriate order.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/dispatchEvent)
fn dispatch_event< T: IEvent >( &self, event: &T ) -> Result< bool, TODO > {
Ok( js! (
return @{self.as_ref()}.dispatchEvent( @{event.as_ref()} );
).try_into().unwrap() )
}
}
/// A reference to a JavaScript object which implements the [IEventTarget](trait.IEventTarget.html)
/// interface.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget)
// https://dom.spec.whatwg.org/#eventtarget
#[derive(Clone, Debug, PartialEq, Eq, ReferenceType)]
#[reference(instance_of = "EventTarget")]
pub struct EventTarget( Reference );
impl IEventTarget for EventTarget {}