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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use dom::bindings::callback::ReportExceptions;
use dom::bindings::codegen::Bindings::EventBinding::EventMethods;
use dom::bindings::codegen::InheritTypes::{EventTargetCast, NodeCast, NodeDerived};
use dom::bindings::js::{JS, JSRef, OptionalSettable, OptionalRootable, Root};
use dom::eventtarget::{Capturing, Bubbling, EventTarget};
use dom::event::{Event, PhaseAtTarget, PhaseNone, PhaseBubbling, PhaseCapturing};
use dom::node::{Node, NodeHelpers};
use dom::virtualmethods::vtable_for;
// See http://dom.spec.whatwg.org/#concept-event-dispatch for the full dispatch algorithm
pub fn dispatch_event<'a, 'b>(target: &JSRef<'a, EventTarget>,
pseudo_target: Option<JSRef<'b, EventTarget>>,
event: &JSRef<Event>) -> bool {
assert!(!event.deref().dispatching.deref().get());
event.target.assign(Some(match pseudo_target {
Some(pseudo_target) => pseudo_target,
None => target.clone(),
}));
event.dispatching.deref().set(true);
let type_ = event.Type();
//TODO: no chain if not participating in a tree
let mut chain: Vec<Root<EventTarget>> = if target.deref().is_node() {
let target_node: &JSRef<Node> = NodeCast::to_ref(target).unwrap();
target_node.ancestors().map(|ancestor| {
let ancestor_target: &JSRef<EventTarget> = EventTargetCast::from_ref(&ancestor);
JS::from_rooted(ancestor_target).root()
}).collect()
} else {
vec!()
};
event.deref().phase.deref().set(PhaseCapturing);
//FIXME: The "callback this value" should be currentTarget
/* capturing */
for cur_target in chain.as_slice().iter().rev() {
let stopped = match cur_target.get_listeners_for(type_.as_slice(), Capturing) {
Some(listeners) => {
event.current_target.assign(Some(cur_target.deref().clone()));
for listener in listeners.iter() {
// Explicitly drop any exception on the floor.
let _ = listener.HandleEvent_(&**cur_target, event, ReportExceptions);
if event.deref().stop_immediate.deref().get() {
break;
}
}
event.deref().stop_propagation.deref().get()
}
None => false
};
if stopped {
break;
}
}
/* at target */
if !event.deref().stop_propagation.deref().get() {
event.phase.deref().set(PhaseAtTarget);
event.current_target.assign(Some(target.clone()));
let opt_listeners = target.deref().get_listeners(type_.as_slice());
for listeners in opt_listeners.iter() {
for listener in listeners.iter() {
// Explicitly drop any exception on the floor.
let _ = listener.HandleEvent_(target, event, ReportExceptions);
if event.deref().stop_immediate.deref().get() {
break;
}
}
}
}
/* bubbling */
if event.deref().bubbles.deref().get() && !event.deref().stop_propagation.deref().get() {
event.deref().phase.deref().set(PhaseBubbling);
for cur_target in chain.iter() {
let stopped = match cur_target.deref().get_listeners_for(type_.as_slice(), Bubbling) {
Some(listeners) => {
event.deref().current_target.assign(Some(cur_target.deref().clone()));
for listener in listeners.iter() {
// Explicitly drop any exception on the floor.
let _ = listener.HandleEvent_(&**cur_target, event, ReportExceptions);
if event.deref().stop_immediate.deref().get() {
break;
}
}
event.deref().stop_propagation.deref().get()
}
None => false
};
if stopped {
break;
}
}
}
/* default action */
let target = event.GetTarget().root();
match target {
Some(target) => {
let node: Option<&JSRef<Node>> = NodeCast::to_ref(&*target);
match node {
Some(node) => {
let vtable = vtable_for(node);
vtable.handle_event(event);
}
None => {}
}
}
None => {}
}
// Root ordering restrictions mean we need to unroot the chain entries
// in the same order they were rooted.
while chain.len() > 0 {
let _ = chain.pop();
}
event.dispatching.deref().set(false);
event.phase.deref().set(PhaseNone);
event.current_target.set(None);
!event.DefaultPrevented()
}
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