script/dom/event.rs
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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 https://mozilla.org/MPL/2.0/. */
use std::cell::Cell;
use std::default::Default;
use base::cross_process_instant::CrossProcessInstant;
use devtools_traits::{TimelineMarker, TimelineMarkerType};
use dom_struct::dom_struct;
use js::rust::HandleObject;
use servo_atoms::Atom;
use crate::dom::bindings::callback::ExceptionHandling;
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::EventBinding;
use crate::dom::bindings::codegen::Bindings::EventBinding::{EventConstants, EventMethods};
use crate::dom::bindings::codegen::Bindings::NodeBinding::GetRootNodeOptions;
use crate::dom::bindings::codegen::Bindings::NodeBinding::Node_Binding::NodeMethods;
use crate::dom::bindings::codegen::Bindings::PerformanceBinding::DOMHighResTimeStamp;
use crate::dom::bindings::codegen::Bindings::ShadowRootBinding::{
ShadowRootMethods, ShadowRootMode,
};
use crate::dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
use crate::dom::bindings::error::Fallible;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::refcounted::Trusted;
use crate::dom::bindings::reflector::{reflect_dom_object_with_proto, DomGlobal, Reflector};
use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom};
use crate::dom::bindings::str::DOMString;
use crate::dom::element::Element;
use crate::dom::eventtarget::{CompiledEventListener, EventTarget, ListenerPhase};
use crate::dom::globalscope::GlobalScope;
use crate::dom::htmlinputelement::InputActivationState;
use crate::dom::htmlslotelement::HTMLSlotElement;
use crate::dom::mouseevent::MouseEvent;
use crate::dom::node::{Node, NodeTraits};
use crate::dom::shadowroot::ShadowRoot;
use crate::dom::virtualmethods::vtable_for;
use crate::dom::window::Window;
use crate::script_runtime::CanGc;
use crate::task::TaskOnce;
/// <https://dom.spec.whatwg.org/#concept-event>
#[dom_struct]
pub(crate) struct Event {
reflector_: Reflector,
/// <https://dom.spec.whatwg.org/#dom-event-currenttarget>
current_target: MutNullableDom<EventTarget>,
/// <https://dom.spec.whatwg.org/#event-target>
target: MutNullableDom<EventTarget>,
/// <https://dom.spec.whatwg.org/#dom-event-type>
#[no_trace]
type_: DomRefCell<Atom>,
/// <https://dom.spec.whatwg.org/#dom-event-eventphase>
phase: Cell<EventPhase>,
/// <https://dom.spec.whatwg.org/#canceled-flag>
canceled: Cell<EventDefault>,
/// <https://dom.spec.whatwg.org/#stop-propagation-flag>
stop_propagation: Cell<bool>,
/// <https://dom.spec.whatwg.org/#stop-immediate-propagation-flag>
stop_immediate_propagation: Cell<bool>,
/// <https://dom.spec.whatwg.org/#dom-event-cancelable>
cancelable: Cell<bool>,
/// <https://dom.spec.whatwg.org/#dom-event-bubbles>
bubbles: Cell<bool>,
/// <https://dom.spec.whatwg.org/#dom-event-composed>
composed: Cell<bool>,
/// <https://dom.spec.whatwg.org/#dom-event-istrusted>
is_trusted: Cell<bool>,
/// <https://dom.spec.whatwg.org/#dispatch-flag>
dispatch: Cell<bool>,
/// <https://dom.spec.whatwg.org/#initialized-flag>
initialized: Cell<bool>,
/// <https://dom.spec.whatwg.org/#dom-event-timestamp>
#[no_trace]
time_stamp: CrossProcessInstant,
/// <https://dom.spec.whatwg.org/#event-path>
path: DomRefCell<Vec<EventPathSegment>>,
/// <https://dom.spec.whatwg.org/#event-relatedtarget>
related_target: MutNullableDom<EventTarget>,
}
/// An element on an [event path](https://dom.spec.whatwg.org/#event-path)
#[derive(JSTraceable, MallocSizeOf)]
#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
pub(crate) struct EventPathSegment {
/// <https://dom.spec.whatwg.org/#event-path-invocation-target>
invocation_target: Dom<EventTarget>,
/// <https://dom.spec.whatwg.org/#event-path-invocation-target-in-shadow-tree>
invocation_target_in_shadow_tree: bool,
/// <https://dom.spec.whatwg.org/#event-path-shadow-adjusted-target>
shadow_adjusted_target: Option<Dom<EventTarget>>,
/// <https://dom.spec.whatwg.org/#event-path-relatedtarget>
related_target: Option<Dom<EventTarget>>,
/// <https://dom.spec.whatwg.org/#event-path-root-of-closed-tree>
root_of_closed_tree: bool,
/// <https://dom.spec.whatwg.org/#event-path-slot-in-closed-tree>
slot_in_closed_tree: bool,
}
impl Event {
pub(crate) fn new_inherited() -> Event {
Event {
reflector_: Reflector::new(),
current_target: Default::default(),
target: Default::default(),
type_: DomRefCell::new(atom!("")),
phase: Cell::new(EventPhase::None),
canceled: Cell::new(EventDefault::Allowed),
stop_propagation: Cell::new(false),
stop_immediate_propagation: Cell::new(false),
cancelable: Cell::new(false),
bubbles: Cell::new(false),
composed: Cell::new(false),
is_trusted: Cell::new(false),
dispatch: Cell::new(false),
initialized: Cell::new(false),
time_stamp: CrossProcessInstant::now(),
path: DomRefCell::default(),
related_target: Default::default(),
}
}
pub(crate) fn new_uninitialized(global: &GlobalScope, can_gc: CanGc) -> DomRoot<Event> {
Self::new_uninitialized_with_proto(global, None, can_gc)
}
pub(crate) fn new_uninitialized_with_proto(
global: &GlobalScope,
proto: Option<HandleObject>,
can_gc: CanGc,
) -> DomRoot<Event> {
reflect_dom_object_with_proto(Box::new(Event::new_inherited()), global, proto, can_gc)
}
pub(crate) fn new(
global: &GlobalScope,
type_: Atom,
bubbles: EventBubbles,
cancelable: EventCancelable,
can_gc: CanGc,
) -> DomRoot<Event> {
Self::new_with_proto(global, None, type_, bubbles, cancelable, can_gc)
}
fn new_with_proto(
global: &GlobalScope,
proto: Option<HandleObject>,
type_: Atom,
bubbles: EventBubbles,
cancelable: EventCancelable,
can_gc: CanGc,
) -> DomRoot<Event> {
let event = Event::new_uninitialized_with_proto(global, proto, can_gc);
// NOTE: The spec doesn't tell us to call init event here, it just happens to do what we need.
event.init_event(type_, bool::from(bubbles), bool::from(cancelable));
event
}
/// <https://dom.spec.whatwg.org/#dom-event-initevent>
/// and <https://dom.spec.whatwg.org/#concept-event-initialize>
pub(crate) fn init_event(&self, type_: Atom, bubbles: bool, cancelable: bool) {
// https://dom.spec.whatwg.org/#dom-event-initevent
if self.dispatch.get() {
return;
}
// https://dom.spec.whatwg.org/#concept-event-initialize
// Step 1. Set event’s initialized flag.
self.initialized.set(true);
// Step 2. Unset event’s stop propagation flag, stop immediate propagation flag, and canceled flag.
self.stop_propagation.set(false);
self.stop_immediate_propagation.set(false);
self.canceled.set(EventDefault::Allowed);
// Step 3. Set event’s isTrusted attribute to false.
self.is_trusted.set(false);
// Step 4. Set event’s target to null.
self.target.set(None);
// Step 5. Set event’s type attribute to type.
*self.type_.borrow_mut() = type_;
// Step 6. Set event’s bubbles attribute to bubbles.
self.bubbles.set(bubbles);
// Step 7. Set event’s cancelable attribute to cancelable.
self.cancelable.set(cancelable);
}
pub(crate) fn set_target(&self, target_: Option<&EventTarget>) {
self.target.set(target_);
}
/// <https://dom.spec.whatwg.org/#concept-event-path-append>
#[cfg_attr(crown, allow(crown::unrooted_must_root))]
pub(crate) fn append_to_path(
&self,
invocation_target: &EventTarget,
shadow_adjusted_target: Option<&EventTarget>,
related_target: Option<&EventTarget>,
slot_in_closed_tree: bool,
) {
// Step 1. Let invocationTargetInShadowTree be false.
let mut invocation_target_in_shadow_tree = false;
// Step 2. If invocationTarget is a node and its root is a shadow root,
// then set invocationTargetInShadowTree to true.
if invocation_target
.downcast::<Node>()
.is_some_and(Node::is_in_a_shadow_tree)
{
invocation_target_in_shadow_tree = true;
}
// Step 3. Let root-of-closed-tree be false.
let mut root_of_closed_tree = false;
// Step 4. If invocationTarget is a shadow root whose mode is "closed", then set root-of-closed-tree to true.
if invocation_target
.downcast::<ShadowRoot>()
.is_some_and(|shadow_root| shadow_root.Mode() == ShadowRootMode::Closed)
{
root_of_closed_tree = true;
}
// Step 5. Append a new struct to event’s path whose invocation target is invocationTarget,
// invocation-target-in-shadow-tree is invocationTargetInShadowTree, shadow-adjusted target is
// shadowAdjustedTarget, relatedTarget is relatedTarget, touch target list is touchTargets,
// root-of-closed-tree is root-of-closed-tree, and slot-in-closed-tree is slot-in-closed-tree.
let event_path_segment = EventPathSegment {
invocation_target: Dom::from_ref(invocation_target),
shadow_adjusted_target: shadow_adjusted_target.map(Dom::from_ref),
related_target: related_target.map(Dom::from_ref),
invocation_target_in_shadow_tree,
root_of_closed_tree,
slot_in_closed_tree,
};
self.path.borrow_mut().push(event_path_segment);
}
/// <https://dom.spec.whatwg.org/#concept-event-dispatch>
pub(crate) fn dispatch(
&self,
target: &EventTarget,
legacy_target_override: bool,
can_gc: CanGc,
// TODO legacy_did_output_listeners_throw_flag for indexeddb
) -> EventStatus {
let mut target = DomRoot::from_ref(target);
// Step 1. Set event’s dispatch flag.
self.dispatch.set(true);
// Step 2. Let targetOverride be target, if legacy target override flag is not given,
// and target’s associated Document otherwise.
let target_override_document; // upcasted EventTarget's lifetime depends on this
let target_override = if legacy_target_override {
target_override_document = target
.downcast::<Window>()
.expect("legacy_target_override must be true only when target is a Window")
.Document();
DomRoot::from_ref(target_override_document.upcast::<EventTarget>())
} else {
target.clone()
};
// Step 3. Let activationTarget be null.
let mut activation_target = None;
// Step 4. Let relatedTarget be the result of retargeting event’s relatedTarget against target.
let related_target = self
.related_target
.get()
.map(|related_target| related_target.retarget(&target));
// Step 5. If target is not relatedTarget or target is event’s relatedTarget:
// Variables declared by the spec inside Step 5 but used later:
// TODO: https://github.com/whatwg/dom/issues/1344
let mut clear_targets = false;
let mut pre_activation_result: Option<InputActivationState> = None;
if related_target.as_ref() != Some(&target) ||
self.related_target.get().as_ref() == Some(&target)
{
// TODO Step 5.1 Let touchTargets be a new list.
// TODO Step 5.2 For each touchTarget of event’s touch target list, append the result of retargeting
// touchTarget against target to touchTargets.
// Step 5.3 Append to an event path with event, target, targetOverride, relatedTarget,
// touchTargets, and false.
self.append_to_path(
&target,
Some(target_override.upcast::<EventTarget>()),
related_target.as_deref(),
false,
);
// Step 5.4 Let isActivationEvent be true, if event is a MouseEvent object and
// event’s type attribute is "click"; otherwise false.
let is_activation_event = self.is::<MouseEvent>() && self.type_() == atom!("click");
// Step 5.5 If isActivationEvent is true and target has activation behavior,
// then set activationTarget to target.
if is_activation_event {
if let Some(element) = target.downcast::<Element>() {
if element.as_maybe_activatable().is_some() {
activation_target = Some(DomRoot::from_ref(element));
}
}
}
// Step 5.6 Let slottable be target, if target is a slottable and is assigned, and null otherwise.
let mut slottable = if target
.downcast::<Node>()
.and_then(Node::assigned_slot)
.is_some()
{
Some(target.clone())
} else {
None
};
// Step 5.7 Let slot-in-closed-tree be false
let mut slot_in_closed_tree = false;
// Step 5.8 Let parent be the result of invoking target’s get the parent with event.
let mut parent_or_none = target.get_the_parent(self);
let mut done = false;
// Step 5.9 While parent is non-null:
while let Some(parent) = parent_or_none.clone() {
// Step 5.9.1 If slottable is non-null:
if slottable.is_some() {
// Step 5.9.1.1 Assert: parent is a slot.
let slot = parent
.downcast::<HTMLSlotElement>()
.expect("parent of slottable is not a slot");
// Step 5.9.1.2 Set slottable to null.
slottable = None;
// Step 5.9.1.3 If parent’s root is a shadow root whose mode is "closed",
// then set slot-in-closed-tree to true.
if slot
.containing_shadow_root()
.is_some_and(|root| root.Mode() == ShadowRootMode::Closed)
{
slot_in_closed_tree = true;
}
}
// Step 5.9.2 If parent is a slottable and is assigned, then set slottable to parent.
if parent
.downcast::<Node>()
.and_then(Node::assigned_slot)
.is_some()
{
slottable = Some(parent.clone());
}
// Step 5.9.3 Let relatedTarget be the result of retargeting event’s relatedTarget against parent.
let related_target = self
.related_target
.get()
.map(|related_target| related_target.retarget(&target));
// TODO: Step 5.9.4 Let touchTargets be a new list.
// Step 5.9.5 For each touchTarget of event’s touch target list, append the result of retargeting
// touchTarget against parent to touchTargets.
// Step 5.9.6 If parent is a Window object, or parent is a node and target’s root is a
// shadow-including inclusive ancestor of parent:
let root_is_shadow_inclusive_ancestor = parent
.downcast::<Node>()
.zip(target.downcast::<Node>())
.is_some_and(|(parent, target)| {
target
.GetRootNode(&GetRootNodeOptions::empty())
.is_shadow_including_inclusive_ancestor_of(parent)
});
if parent.is::<Window>() || root_is_shadow_inclusive_ancestor {
// Step 5.9.6.1 If isActivationEvent is true, event’s bubbles attribute is true, activationTarget
// is null, and parent has activation behavior, then set activationTarget to parent.
if is_activation_event && activation_target.is_none() && self.bubbles.get() {
if let Some(element) = parent.downcast::<Element>() {
if element.as_maybe_activatable().is_some() {
activation_target = Some(DomRoot::from_ref(element));
}
}
}
// Step 5.9.6.2 Append to an event path with event, parent, null, relatedTarget, touchTargets,
// and slot-in-closed-tree.
self.append_to_path(
&parent,
None,
related_target.as_deref(),
slot_in_closed_tree,
);
}
// Step 5.9.7 Otherwise, if parent is relatedTarget, then set parent to null.
else if Some(&parent) == related_target.as_ref() {
// NOTE: This causes some lifetime shenanigans. Instead of making things complicated,
// we just remember to treat parent as null later
done = true;
}
// Step 5.9.8 Otherwise:
else {
// Step 5.9.8.1 Set target to parent.
target = parent.clone();
// Step 5.9.8.2 If isActivationEvent is true, activationTarget is null, and target has
// activation behavior, then set activationTarget to target.
if is_activation_event && activation_target.is_none() {
if let Some(element) = parent.downcast::<Element>() {
if element.as_maybe_activatable().is_some() {
activation_target = Some(DomRoot::from_ref(element));
}
}
}
// Step 5.9.8.3 Append to an event path with event, parent, target, relatedTarget,
// touchTargets, and slot-in-closed-tree.
self.append_to_path(
&parent,
Some(&target),
related_target.as_deref(),
slot_in_closed_tree,
);
}
// Step 5.9.9 If parent is non-null, then set parent to the result of invoking parent’s
// get the parent with event
if !done {
parent_or_none = parent.get_the_parent(self);
}
// Step 5.9.10 Set slot-in-closed-tree to false.
slot_in_closed_tree = false;
}
// Step 5.10 Let clearTargetsStruct be the last struct in event’s path whose shadow-adjusted target
// is non-null.
// Step 5.11 Let clearTargets be true if clearTargetsStruct’s shadow-adjusted target,
// clearTargetsStruct’s relatedTarget, or an EventTarget object in clearTargetsStruct’s
// touch target list is a node and its root is a shadow root; otherwise false.
// TODO: Handle touch target list
clear_targets = self
.path
.borrow()
.iter()
.rev()
.find(|segment| segment.shadow_adjusted_target.is_some())
// This is "clearTargetsStruct"
.is_some_and(|clear_targets| {
clear_targets
.shadow_adjusted_target
.as_ref()
.and_then(|target| target.downcast::<Node>())
.is_some_and(Node::is_in_a_shadow_tree) ||
clear_targets
.related_target
.as_ref()
.and_then(|target| target.downcast::<Node>())
.is_some_and(Node::is_in_a_shadow_tree)
});
// Step 5.12 If activationTarget is non-null and activationTarget has legacy-pre-activation behavior,
// then run activationTarget’s legacy-pre-activation behavior.
if let Some(activation_target) = activation_target.as_ref() {
// Not specified in dispatch spec overtly; this is because
// the legacy canceled activation behavior of a checkbox
// or radio button needs to know what happened in the
// corresponding pre-activation behavior.
pre_activation_result = activation_target
.as_maybe_activatable()
.and_then(|activatable| activatable.legacy_pre_activation_behavior());
}
let timeline_window = DomRoot::downcast::<Window>(target.global())
.filter(|window| window.need_emit_timeline_marker(TimelineMarkerType::DOMEvent));
// Step 5.13 For each struct in event’s path, in reverse order:
for (index, segment) in self.path.borrow().iter().enumerate().rev() {
// Step 5.13.1 If struct’s shadow-adjusted target is non-null, then set event’s
// eventPhase attribute to AT_TARGET.
if segment.shadow_adjusted_target.is_some() {
self.phase.set(EventPhase::AtTarget);
}
// Step 5.13.2 Otherwise, set event’s eventPhase attribute to CAPTURING_PHASE.
else {
self.phase.set(EventPhase::Capturing);
}
// Step 5.13.3 Invoke with struct, event, "capturing", and legacyOutputDidListenersThrowFlag if given.
invoke(
segment,
index,
self,
ListenerPhase::Capturing,
timeline_window.as_deref(),
can_gc,
)
}
// Step 5.14 For each struct in event’s path:
for (index, segment) in self.path.borrow().iter().enumerate() {
// Step 5.14.1 If struct’s shadow-adjusted target is non-null, then set event’s
// eventPhase attribute to AT_TARGET.
if segment.shadow_adjusted_target.is_some() {
self.phase.set(EventPhase::AtTarget);
}
// Step 5.14.2 Otherwise:
else {
// Step 5.14.2.1 If event’s bubbles attribute is false, then continue.
if !self.bubbles.get() {
continue;
}
// Step 5.14.2.2 Set event’s eventPhase attribute to BUBBLING_PHASE.
self.phase.set(EventPhase::Bubbling);
}
// Step 5.14.3 Invoke with struct, event, "bubbling", and legacyOutputDidListenersThrowFlag if given.
invoke(
segment,
index,
self,
ListenerPhase::Bubbling,
timeline_window.as_deref(),
can_gc,
);
}
}
// Step 6. Set event’s eventPhase attribute to NONE.
self.phase.set(EventPhase::None);
// FIXME: The UIEvents spec still expects firing an event
// to carry a "default action" semantic, but the HTML spec
// has removed this concept. Nothing in either spec currently
// (as of Jan 11 2020) says that, e.g., a keydown event on an
// input element causes a character to be typed; the UIEvents
// spec assumes the HTML spec is covering it, and the HTML spec
// no longer specifies any UI event other than mouse click as
// causing an element to perform an action.
// Compare:
// https://w3c.github.io/uievents/#default-action
// https://dom.spec.whatwg.org/#action-versus-occurance
if !self.DefaultPrevented() {
if let Some(target) = self.GetTarget() {
if let Some(node) = target.downcast::<Node>() {
let vtable = vtable_for(node);
vtable.handle_event(self);
}
}
}
// Step 7. Set event’s currentTarget attribute to null.
self.current_target.set(None);
// Step 8. Set event’s path to the empty list.
self.path.borrow_mut().clear();
// Step 9. Unset event’s dispatch flag, stop propagation flag, and stop immediate propagation flag.
self.dispatch.set(false);
self.stop_propagation.set(false);
self.stop_immediate_propagation.set(false);
// Step 10. If clearTargets is true:
if clear_targets {
// Step 10.1 Set event’s target to null.
self.target.set(None);
// Step 10.2 Set event’s relatedTarget to null.
self.related_target.set(None);
// TODO Step 10.3 Set event’s touch target list to the empty list.
}
// Step 11. If activationTarget is non-null:
if let Some(activation_target) = activation_target {
// NOTE: The activation target may have been disabled by an event handler
if let Some(activatable) = activation_target.as_maybe_activatable() {
// Step 11.1 If event’s canceled flag is unset, then run activationTarget’s
// activation behavior with event.
if !self.DefaultPrevented() {
activatable.activation_behavior(self, &target, can_gc);
}
// Step 11.2 Otherwise, if activationTarget has legacy-canceled-activation behavior, then run
// activationTarget’s legacy-canceled-activation behavior.
else {
activatable.legacy_canceled_activation_behavior(pre_activation_result);
}
}
}
// Step 12 Return false if event’s canceled flag is set; otherwise true.
self.status()
}
pub(crate) fn status(&self) -> EventStatus {
if self.DefaultPrevented() {
EventStatus::Canceled
} else {
EventStatus::NotCanceled
}
}
#[inline]
pub(crate) fn dispatching(&self) -> bool {
self.dispatch.get()
}
#[inline]
pub(crate) fn initialized(&self) -> bool {
self.initialized.get()
}
#[inline]
pub(crate) fn type_(&self) -> Atom {
self.type_.borrow().clone()
}
#[inline]
pub(crate) fn mark_as_handled(&self) {
self.canceled.set(EventDefault::Handled);
}
#[inline]
pub(crate) fn get_cancel_state(&self) -> EventDefault {
self.canceled.get()
}
pub(crate) fn set_trusted(&self, trusted: bool) {
self.is_trusted.set(trusted);
}
pub(crate) fn set_composed(&self, composed: bool) {
self.composed.set(composed);
}
/// <https://html.spec.whatwg.org/multipage/#fire-a-simple-event>
pub(crate) fn fire(&self, target: &EventTarget, can_gc: CanGc) -> EventStatus {
self.set_trusted(true);
target.dispatch_event(self, can_gc)
}
/// <https://dom.spec.whatwg.org/#inner-event-creation-steps>
fn inner_creation_steps(
global: &GlobalScope,
proto: Option<HandleObject>,
init: &EventBinding::EventInit,
can_gc: CanGc,
) -> DomRoot<Event> {
// Step 1. Let event be the result of creating a new object using eventInterface.
// If realm is non-null, then use that realm; otherwise, use the default behavior defined in Web IDL.
let event = Event::new_uninitialized_with_proto(global, proto, can_gc);
// Step 2. Set event’s initialized flag.
event.initialized.set(true);
// Step 3. Initialize event’s timeStamp attribute to the relative high resolution
// coarse time given time and event’s relevant global object.
// NOTE: This is done inside Event::new_inherited
// Step 3. For each member → value in dictionary, if event has an attribute whose
// identifier is member, then initialize that attribute to value.#
event.bubbles.set(init.bubbles);
event.cancelable.set(init.cancelable);
event.composed.set(init.composed);
// Step 5. Run the event constructing steps with event and dictionary.
// NOTE: Event construction steps may be defined by subclasses
// Step 6. Return event.
event
}
/// Implements the logic behind the [get the parent](https://dom.spec.whatwg.org/#get-the-parent)
/// algorithm for shadow roots.
pub(crate) fn should_pass_shadow_boundary(&self, shadow_root: &ShadowRoot) -> bool {
debug_assert!(self.dispatching());
// > A shadow root’s get the parent algorithm, given an event, returns null if event’s composed flag
// > is unset and shadow root is the root of event’s path’s first struct’s invocation target;
// > otherwise shadow root’s host.
if self.Composed() {
return true;
}
let path = self.path.borrow();
let first_invocation_target = &path
.first()
.expect("Event path is empty despite event currently being dispatched")
.invocation_target
.as_rooted();
// The spec doesn't tell us what should happen if the invocation target is not a node
let Some(target_node) = first_invocation_target.downcast::<Node>() else {
return false;
};
&*target_node.GetRootNode(&GetRootNodeOptions::empty()) != shadow_root.upcast::<Node>()
}
}
impl EventMethods<crate::DomTypeHolder> for Event {
/// <https://dom.spec.whatwg.org/#concept-event-constructor>
fn Constructor(
global: &GlobalScope,
proto: Option<HandleObject>,
can_gc: CanGc,
type_: DOMString,
init: &EventBinding::EventInit,
) -> Fallible<DomRoot<Event>> {
// Step 1. Let event be the result of running the inner event creation steps with
// this interface, null, now, and eventInitDict.
let event = Event::inner_creation_steps(global, proto, init, can_gc);
// Step 2. Initialize event’s type attribute to type.
*event.type_.borrow_mut() = Atom::from(type_);
// Step 3. Return event.
Ok(event)
}
/// <https://dom.spec.whatwg.org/#dom-event-eventphase>
fn EventPhase(&self) -> u16 {
self.phase.get() as u16
}
/// <https://dom.spec.whatwg.org/#dom-event-type>
fn Type(&self) -> DOMString {
DOMString::from(&*self.type_()) // FIXME(ajeffrey): Directly convert from Atom to DOMString
}
/// <https://dom.spec.whatwg.org/#dom-event-target>
fn GetTarget(&self) -> Option<DomRoot<EventTarget>> {
self.target.get()
}
/// <https://dom.spec.whatwg.org/#dom-event-srcelement>
fn GetSrcElement(&self) -> Option<DomRoot<EventTarget>> {
self.target.get()
}
/// <https://dom.spec.whatwg.org/#dom-event-currenttarget>
fn GetCurrentTarget(&self) -> Option<DomRoot<EventTarget>> {
self.current_target.get()
}
/// <https://dom.spec.whatwg.org/#dom-event-composedpath>
fn ComposedPath(&self) -> Vec<DomRoot<EventTarget>> {
// Step 1. Let composedPath be an empty list.
let mut composed_path = vec![];
// Step 2. Let path be this’s path.
let path = self.path.borrow();
// Step 3. If path is empty, then return composedPath.
if path.is_empty() {
return composed_path;
}
// Step 4. Let currentTarget be this’s currentTarget attribute value.
let current_target = self.GetCurrentTarget();
// Step 5. Append currentTarget to composedPath.
// TODO: https://github.com/whatwg/dom/issues/1343
composed_path.push(current_target.clone().expect(
"Since the event's path is not empty it is being dispatched and must have a current target",
));
// Step 6. Let currentTargetIndex be 0.
let mut current_target_index = 0;
// Step 7. Let currentTargetHiddenSubtreeLevel be 0.
let mut current_target_hidden_subtree_level = 0;
// Step 8. Let index be path’s size − 1.
// Step 9. While index is greater than or equal to 0:
// NOTE: This is just iterating the path in reverse
for (index, element) in path.iter().enumerate().rev() {
// Step 9.1 If path[index]'s root-of-closed-tree is true, then increase
// currentTargetHiddenSubtreeLevel by 1.
if element.root_of_closed_tree {
current_target_hidden_subtree_level += 1;
}
// Step 9.2 If path[index]'s invocation target is currentTarget, then set
// currentTargetIndex to index and break.
if current_target
.as_ref()
.is_some_and(|target| target.as_traced() == element.invocation_target)
{
current_target_index = index;
break;
}
// Step 9.3 If path[index]'s slot-in-closed-tree is true, then decrease
// currentTargetHiddenSubtreeLevel by 1.
if element.slot_in_closed_tree {
current_target_hidden_subtree_level -= 1;
}
// Step 9.4 Decrease index by 1.
}
// Step 10. Let currentHiddenLevel and maxHiddenLevel be currentTargetHiddenSubtreeLevel.
let mut current_hidden_level = current_target_hidden_subtree_level;
let mut max_hidden_level = current_target_hidden_subtree_level;
// Step 11. Set index to currentTargetIndex − 1.
// Step 12. While index is greater than or equal to 0:
// NOTE: This is just iterating part of the path in reverse
for element in path.iter().take(current_target_index).rev() {
// Step 12.1 If path[index]'s root-of-closed-tree is true, then increase currentHiddenLevel by 1.
if element.root_of_closed_tree {
current_hidden_level += 1;
}
// Step 12.2 If currentHiddenLevel is less than or equal to maxHiddenLevel,
// then prepend path[index]'s invocation target to composedPath.
if current_hidden_level <= max_hidden_level {
composed_path.insert(0, element.invocation_target.as_rooted());
}
// Step 12.3 If path[index]'s slot-in-closed-tree is true:
if element.slot_in_closed_tree {
// Step 12.3.1 Decrease currentHiddenLevel by 1.
current_hidden_level -= 1;
// Step 12.3.2 If currentHiddenLevel is less than maxHiddenLevel, then set
// maxHiddenLevel to currentHiddenLevel.
if current_hidden_level < max_hidden_level {
max_hidden_level = current_hidden_level;
}
}
// Step 12.4 Decrease index by 1.
}
// Step 13. Set currentHiddenLevel and maxHiddenLevel to currentTargetHiddenSubtreeLevel.
current_hidden_level = current_target_hidden_subtree_level;
max_hidden_level = current_target_hidden_subtree_level;
// Step 14. Set index to currentTargetIndex + 1.
// Step 15. While index is less than path’s size:
// NOTE: This is just iterating the list and skipping the first current_target_index + 1 elements
// (The +1 is necessary because the index is 0-based and the skip method is not)
for element in path.iter().skip(current_target_index + 1) {
// Step 15.1 If path[index]'s slot-in-closed-tree is true, then increase currentHiddenLevel by 1.
if element.slot_in_closed_tree {
current_hidden_level += 1;
}
// Step 15.2 If currentHiddenLevel is less than or equal to maxHiddenLevel,
// then append path[index]'s invocation target to composedPath.
if current_hidden_level <= max_hidden_level {
composed_path.push(element.invocation_target.as_rooted());
}
// Step 15.3 If path[index]'s root-of-closed-tree is true:
if element.root_of_closed_tree {
// Step 15.3.1 Decrease currentHiddenLevel by 1.
current_hidden_level -= 1;
// Step 15.3.2 If currentHiddenLevel is less than maxHiddenLevel, then set
// maxHiddenLevel to currentHiddenLevel.
if current_hidden_level < max_hidden_level {
max_hidden_level = current_hidden_level;
}
}
// Step 15.4 Increase index by 1.
}
// Step 16. Return composedPath.
composed_path
}
/// <https://dom.spec.whatwg.org/#dom-event-defaultprevented>
fn DefaultPrevented(&self) -> bool {
self.canceled.get() == EventDefault::Prevented
}
/// <https://dom.spec.whatwg.org/#dom-event-composed>
fn Composed(&self) -> bool {
self.composed.get()
}
/// <https://dom.spec.whatwg.org/#dom-event-preventdefault>
fn PreventDefault(&self) {
if self.cancelable.get() {
self.canceled.set(EventDefault::Prevented)
}
}
/// <https://dom.spec.whatwg.org/#dom-event-stoppropagation>
fn StopPropagation(&self) {
self.stop_propagation.set(true);
}
/// <https://dom.spec.whatwg.org/#dom-event-stopimmediatepropagation>
fn StopImmediatePropagation(&self) {
self.stop_immediate_propagation.set(true);
self.stop_propagation.set(true);
}
/// <https://dom.spec.whatwg.org/#dom-event-bubbles>
fn Bubbles(&self) -> bool {
self.bubbles.get()
}
/// <https://dom.spec.whatwg.org/#dom-event-cancelable>
fn Cancelable(&self) -> bool {
self.cancelable.get()
}
/// <https://dom.spec.whatwg.org/#dom-event-returnvalue>
fn ReturnValue(&self) -> bool {
self.canceled.get() == EventDefault::Allowed
}
/// <https://dom.spec.whatwg.org/#dom-event-returnvalue>
fn SetReturnValue(&self, val: bool) {
if !val {
self.PreventDefault();
}
}
/// <https://dom.spec.whatwg.org/#dom-event-cancelbubble>
fn CancelBubble(&self) -> bool {
self.stop_propagation.get()
}
/// <https://dom.spec.whatwg.org/#dom-event-cancelbubble>
fn SetCancelBubble(&self, value: bool) {
if value {
self.stop_propagation.set(true)
}
}
/// <https://dom.spec.whatwg.org/#dom-event-timestamp>
fn TimeStamp(&self) -> DOMHighResTimeStamp {
self.global()
.performance()
.to_dom_high_res_time_stamp(self.time_stamp)
}
/// <https://dom.spec.whatwg.org/#dom-event-initevent>
fn InitEvent(&self, type_: DOMString, bubbles: bool, cancelable: bool) {
self.init_event(Atom::from(type_), bubbles, cancelable)
}
/// <https://dom.spec.whatwg.org/#dom-event-istrusted>
fn IsTrusted(&self) -> bool {
self.is_trusted.get()
}
}
#[derive(Clone, Copy, MallocSizeOf, PartialEq)]
pub(crate) enum EventBubbles {
Bubbles,
DoesNotBubble,
}
impl From<bool> for EventBubbles {
fn from(boolean: bool) -> Self {
if boolean {
EventBubbles::Bubbles
} else {
EventBubbles::DoesNotBubble
}
}
}
impl From<EventBubbles> for bool {
fn from(bubbles: EventBubbles) -> Self {
match bubbles {
EventBubbles::Bubbles => true,
EventBubbles::DoesNotBubble => false,
}
}
}
#[derive(Clone, Copy, MallocSizeOf, PartialEq)]
pub(crate) enum EventCancelable {
Cancelable,
NotCancelable,
}
impl From<bool> for EventCancelable {
fn from(boolean: bool) -> Self {
if boolean {
EventCancelable::Cancelable
} else {
EventCancelable::NotCancelable
}
}
}
impl From<EventCancelable> for bool {
fn from(bubbles: EventCancelable) -> Self {
match bubbles {
EventCancelable::Cancelable => true,
EventCancelable::NotCancelable => false,
}
}
}
#[derive(Clone, Copy, Debug, Eq, JSTraceable, PartialEq)]
#[repr(u16)]
#[derive(MallocSizeOf)]
pub(crate) enum EventPhase {
None = EventConstants::NONE,
Capturing = EventConstants::CAPTURING_PHASE,
AtTarget = EventConstants::AT_TARGET,
Bubbling = EventConstants::BUBBLING_PHASE,
}
/// An enum to indicate whether the default action of an event is allowed.
///
/// This should've been a bool. Instead, it's an enum, because, aside from the allowed/canceled
/// states, we also need something to stop the event from being handled again (without cancelling
/// the event entirely). For example, an Up/Down `KeyEvent` inside a `textarea` element will
/// trigger the cursor to go up/down if the text inside the element spans multiple lines. This enum
/// helps us to prevent such events from being [sent to the constellation][msg] where it will be
/// handled once again for page scrolling (which is definitely not what we'd want).
///
/// [msg]: https://doc.servo.org/compositing/enum.ConstellationMsg.html#variant.KeyEvent
///
#[derive(Clone, Copy, JSTraceable, MallocSizeOf, PartialEq)]
pub(crate) enum EventDefault {
/// The default action of the event is allowed (constructor's default)
Allowed,
/// The default action has been prevented by calling `PreventDefault`
Prevented,
/// The event has been handled somewhere in the DOM, and it should be prevented from being
/// re-handled elsewhere. This doesn't affect the judgement of `DefaultPrevented`
Handled,
}
#[derive(PartialEq)]
pub(crate) enum EventStatus {
Canceled,
NotCanceled,
}
/// <https://dom.spec.whatwg.org/#concept-event-fire>
pub(crate) struct EventTask {
pub(crate) target: Trusted<EventTarget>,
pub(crate) name: Atom,
pub(crate) bubbles: EventBubbles,
pub(crate) cancelable: EventCancelable,
}
impl TaskOnce for EventTask {
fn run_once(self) {
let target = self.target.root();
let bubbles = self.bubbles;
let cancelable = self.cancelable;
target.fire_event_with_params(self.name, bubbles, cancelable, CanGc::note());
}
}
/// <https://html.spec.whatwg.org/multipage/#fire-a-simple-event>
pub(crate) struct SimpleEventTask {
pub(crate) target: Trusted<EventTarget>,
pub(crate) name: Atom,
}
impl TaskOnce for SimpleEventTask {
fn run_once(self) {
let target = self.target.root();
target.fire_event(self.name, CanGc::note());
}
}
/// <https://dom.spec.whatwg.org/#concept-event-listener-invoke>
fn invoke(
segment: &EventPathSegment,
segment_index_in_path: usize,
event: &Event,
phase: ListenerPhase,
timeline_window: Option<&Window>,
can_gc: CanGc,
// TODO legacy_output_did_listeners_throw for indexeddb
) {
// Step 1. Set event’s target to the shadow-adjusted target of the last struct in event’s path,
// that is either struct or preceding struct, whose shadow-adjusted target is non-null.
event.target.set(
event.path.borrow()[..segment_index_in_path + 1]
.iter()
.rev()
.flat_map(|segment| segment.shadow_adjusted_target.clone())
.next()
.as_deref(),
);
// Step 2. Set event’s relatedTarget to struct’s relatedTarget.
event.related_target.set(segment.related_target.as_deref());
// TODO: Set event’s touch target list to struct’s touch target list.
// Step 4. If event’s stop propagation flag is set, then return.
if event.stop_propagation.get() {
return;
}
// Step 5. Initialize event’s currentTarget attribute to struct’s invocation target.
event.current_target.set(Some(&segment.invocation_target));
// Step 6. Let listeners be a clone of event’s currentTarget attribute value’s event listener list.
let listeners =
segment
.invocation_target
.get_listeners_for(&event.type_(), Some(phase), can_gc);
// Step 7. Let invocationTargetInShadowTree be struct’s invocation-target-in-shadow-tree.
let invocation_target_in_shadow_tree = segment.invocation_target_in_shadow_tree;
// Step 8. Let found be the result of running inner invoke with event, listeners, phase,
// invocationTargetInShadowTree, and legacyOutputDidListenersThrowFlag if given.
let found = inner_invoke(
event,
&listeners,
phase,
invocation_target_in_shadow_tree,
timeline_window,
);
// Step 9. If found is false and event’s isTrusted attribute is true:
if !found && event.is_trusted.get() {
// Step 9.1 Let originalEventType be event’s type attribute value.
let original_type = event.type_();
// Step 9.2 If event’s type attribute value is a match for any of the strings in the first column
// in the following table, set event’s type attribute value to the string in the second column on
// the same row as the matching string, and return otherwise.
let legacy_type = match event.type_() {
atom!("animationend") => atom!("webkitAnimationEnd"),
atom!("animationiteration") => atom!("webkitAnimationIteration"),
atom!("animationstart") => atom!("webkitAnimationStart"),
atom!("transitionend") => atom!("webkitTransitionEnd"),
atom!("transitionrun") => atom!("webkitTransitionRun"),
_ => return,
};
*event.type_.borrow_mut() = legacy_type;
// Step 9.3 Inner invoke with event, listeners, phase, invocationTargetInShadowTree,
// and legacyOutputDidListenersThrowFlag if given.
inner_invoke(
event,
&listeners,
phase,
invocation_target_in_shadow_tree,
timeline_window,
);
// Step 9.4 Set event’s type attribute value to originalEventType.
*event.type_.borrow_mut() = original_type;
}
}
/// <https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke>
fn inner_invoke(
event: &Event,
listeners: &[CompiledEventListener],
_phase: ListenerPhase,
invocation_target_in_shadow_tree: bool,
timeline_window: Option<&Window>,
) -> bool {
// Step 1. Let found be false.
let mut found = false;
// Step 2. For each listener in listeners, whose removed is false:
for listener in listeners {
// FIXME(#25479): We need an "if !listener.removed()" here,
// but there's a subtlety. Where Servo is currently using the
// CompiledEventListener, we really need something that maps to
// https://dom.spec.whatwg.org/#concept-event-listener
// which is not the same thing as the EventListener interface.
// script::dom::eventtarget::EventListenerEntry is the closest
// match we have, and is already holding the "once" flag,
// but it's not a drop-in replacement.
// 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.
// TODO: Step 2.1 If event’s type attribute value is not listener’s type, then continue.
// Step 2.2. Set found to true.
found = true;
// TODO Step 2.3 If phase is "capturing" and listener’s capture is false, then continue.
// TODO Step 2.4 If phase is "bubbling" and listener’s capture is true, then continue.
// Step 2.5 If listener’s once is true, then remove an event listener given event’s currentTarget
// attribute value and listener.
if let CompiledEventListener::Listener(event_listener) = listener {
event
.GetCurrentTarget()
.expect("event target was initialized as part of \"invoke\"")
.remove_listener_if_once(&event.type_(), event_listener);
}
// Step 2.6 Let global be listener callback’s associated realm’s global object.
let global = listener.associated_global();
// Step 2.7 Let currentEvent be undefined.
let mut current_event = None;
// Step 2.8 If global is a Window object:
if let Some(window) = global.downcast::<Window>() {
// Step 2.8.1 Set currentEvent to global’s current event.
current_event = window.current_event();
// Step 2.8.2 If invocationTargetInShadowTree is false, then set global’s current event to event.
if !invocation_target_in_shadow_tree {
current_event = window.set_current_event(Some(event))
}
}
// TODO Step 2.9 If listener’s passive is true, then set event’s in passive listener flag.
// Step 2.10 If global is a Window object, then record timing info for event listener given event and listener.
// Step 2.11 Call a user object’s operation with listener’s callback, "handleEvent", « event »,
// and event’s currentTarget attribute value. If this throws an exception exception:
// Step 2.10.1 Report exception for listener’s callback’s corresponding JavaScript object’s
// associated realm’s global object.
// TODO Step 2.10.2 Set legacyOutputDidListenersThrowFlag if given.
let marker = TimelineMarker::start("DOMEvent".to_owned());
listener.call_or_handle_event(
&event
.GetCurrentTarget()
.expect("event target was initialized as part of \"invoke\""),
event,
ExceptionHandling::Report,
);
if let Some(window) = timeline_window {
window.emit_timeline_marker(marker.end());
}
// TODO Step 2.12 Unset event’s in passive listener flag.
// Step 2.13 If global is a Window object, then set global’s current event to currentEvent.
if let Some(window) = global.downcast::<Window>() {
window.set_current_event(current_event.as_deref());
}
// Step 2.13: If event’s stop immediate propagation flag is set, then break.
if event.stop_immediate_propagation.get() {
break;
}
}
// Step 3.
found
}