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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 devtools_traits::{StartedTimelineMarker, TimelineMarker, TimelineMarkerType};
use dom::bindings::callback::ExceptionHandling::Report;
use dom::bindings::codegen::Bindings::EventBinding::EventMethods;
use dom::bindings::global::GlobalRoot;
use dom::bindings::inheritance::Castable;
use dom::bindings::js::{JS, Root, RootedReference};
use dom::bindings::reflector::Reflectable;
use dom::bindings::trace::RootedVec;
use dom::document::Document;
use dom::event::{Event, EventPhase};
use dom::eventtarget::{CompiledEventListener, EventTarget, ListenerPhase};
use dom::node::Node;
use dom::virtualmethods::vtable_for;
use dom::window::Window;
struct AutoDOMEventMarker {
window: Root<Window>,
marker: Option<StartedTimelineMarker>,
}
impl AutoDOMEventMarker {
fn new(window: &Window) -> AutoDOMEventMarker {
AutoDOMEventMarker {
window: Root::from_ref(window),
marker: Some(TimelineMarker::start("DOMEvent".to_owned())),
}
}
}
impl Drop for AutoDOMEventMarker {
fn drop(&mut self) {
self.window.emit_timeline_marker(self.marker.take().unwrap().end());
}
}
fn handle_event(window: Option<&Window>, listener: &CompiledEventListener,
current_target: &EventTarget, event: &Event) {
let _marker;
if let Some(window) = window {
_marker = AutoDOMEventMarker::new(window);
}
listener.call_or_handle_event(current_target, event, Report);
}
// See dispatch_event.
// https://dom.spec.whatwg.org/#concept-event-dispatch
fn dispatch_to_listeners(event: &Event, target: &EventTarget, event_path: &[&EventTarget]) {
assert!(!event.stop_propagation());
assert!(!event.stop_immediate());
let window = match target.global() {
GlobalRoot::Window(window) => {
if window.need_emit_timeline_marker(TimelineMarkerType::DOMEvent) {
Some(window)
} else {
None
}
},
_ => None,
};
// Step 5.
event.set_phase(EventPhase::Capturing);
// Step 6.
for object in event_path.iter().rev() {
invoke(window.r(), object, event, Some(ListenerPhase::Capturing));
if event.stop_propagation() {
return;
}
}
assert!(!event.stop_propagation());
assert!(!event.stop_immediate());
// Step 7.
event.set_phase(EventPhase::AtTarget);
// Step 8.
invoke(window.r(), target, event, None);
if event.stop_propagation() {
return;
}
assert!(!event.stop_propagation());
assert!(!event.stop_immediate());
if !event.bubbles() {
return;
}
// Step 9.1.
event.set_phase(EventPhase::Bubbling);
// Step 9.2.
for object in event_path {
invoke(window.r(), object, event, Some(ListenerPhase::Bubbling));
if event.stop_propagation() {
return;
}
}
}
// https://dom.spec.whatwg.org/#concept-event-dispatch
pub fn dispatch_event(target: &EventTarget,
target_override: Option<&EventTarget>,
event: &Event) -> bool {
assert!(!event.dispatching());
assert!(event.initialized());
assert_eq!(event.phase(), EventPhase::None);
assert!(event.GetCurrentTarget().is_none());
// Step 2.
event.set_target(target_override.unwrap_or(target));
if event.stop_propagation() {
// If the event's stop propagation flag is set, we can skip everything because
// it prevents the calls of the invoke algorithm in the spec and we asserted
// at the beginning that steps 10-12 don't need to be executed.
return !event.DefaultPrevented();
}
// Step 1. Postponed here for the reason stated above.
event.set_dispatching(true);
// Step 3. The "invoke" algorithm is only used on `target` separately,
// so we don't put it in the path.
let mut event_path: RootedVec<JS<EventTarget>> = RootedVec::new();
// Step 4.
if let Some(target_node) = target.downcast::<Node>() {
for ancestor in target_node.ancestors() {
event_path.push(JS::from_ref(ancestor.upcast()));
}
let top_most_ancestor_or_target =
Root::from_ref(event_path.r().last().cloned().unwrap_or(target));
if let Some(document) = Root::downcast::<Document>(top_most_ancestor_or_target) {
if event.type_() != atom!("load") && document.browsing_context().is_some() {
event_path.push(JS::from_ref(document.window().upcast()));
}
}
}
// Steps 5-9. In a separate function to short-circuit various things easily.
dispatch_to_listeners(event, target, event_path.r());
// Default action.
let target = event.GetTarget();
match target {
Some(ref target) => {
if let Some(node) = target.downcast::<Node>() {
let vtable = vtable_for(&node);
vtable.handle_event(event);
}
}
None => {}
}
// Step 10.
event.set_dispatching(false);
// Step 11.
event.set_phase(EventPhase::None);
// Step 12.
event.clear_current_target();
// Step 13.
!event.DefaultPrevented()
}
// https://dom.spec.whatwg.org/#concept-event-listener-invoke
fn invoke(window: Option<&Window>,
object: &EventTarget,
event: &Event,
specific_listener_phase: Option<ListenerPhase>) {
// Step 1.
assert!(!event.stop_propagation());
// Steps 2-3.
let listeners = object.get_listeners_for(&event.type_(), specific_listener_phase);
// Step 4.
event.set_current_target(object);
// Step 5.
inner_invoke(window, object, event, &listeners);
// TODO: step 6.
}
// https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke
fn inner_invoke(window: Option<&Window>,
object: &EventTarget,
event: &Event,
listeners: &[CompiledEventListener])
-> bool {
// Step 1.
let mut found = false;
// Step 2.
for listener in listeners {
// Steps 2.1 and 2.3-2.4 are not done because `listeners` contain only the
// relevant ones for this invoke call during the dispatch algorithm.
// Step 2.2.
found = true;
// TODO: step 2.5.
// Step 2.6.
handle_event(window, listener, object, event);
if event.stop_immediate() {
return found;
}
// TODO: step 2.7.
}
// Step 3.
found
}
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