f7f37eaa0f
The root of a node can never be null, as "the root of an object is itself, if its parent is null, or else it is the root of its parent." https://dom.spec.whatwg.org/#concept-tree-root
312 lines
11 KiB
C++
312 lines
11 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Assertions.h>
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#include <AK/TypeCasts.h>
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#include <LibJS/Runtime/FunctionObject.h>
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#include <LibWeb/Bindings/EventTargetWrapper.h>
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#include <LibWeb/Bindings/EventTargetWrapperFactory.h>
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#include <LibWeb/Bindings/EventWrapper.h>
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#include <LibWeb/Bindings/EventWrapperFactory.h>
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#include <LibWeb/Bindings/ScriptExecutionContext.h>
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#include <LibWeb/Bindings/WindowObject.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Event.h>
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#include <LibWeb/DOM/EventDispatcher.h>
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#include <LibWeb/DOM/EventListener.h>
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#include <LibWeb/DOM/EventTarget.h>
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#include <LibWeb/DOM/Node.h>
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#include <LibWeb/DOM/ShadowRoot.h>
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#include <LibWeb/DOM/Window.h>
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#include <LibWeb/HTML/EventNames.h>
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#include <LibWeb/UIEvents/MouseEvent.h>
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namespace Web::DOM {
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// FIXME: This shouldn't be here, as retargeting is not only used by the event dispatcher.
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// When moving this function, it needs to be generalized. https://dom.spec.whatwg.org/#retarget
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static EventTarget* retarget(EventTarget* left, EventTarget* right)
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{
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for (;;) {
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if (!is<Node>(left))
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return left;
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auto* left_node = verify_cast<Node>(left);
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auto& left_root = left_node->root();
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if (!is<ShadowRoot>(left_root))
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return left;
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if (is<Node>(right) && left_root.is_shadow_including_inclusive_ancestor_of(verify_cast<Node>(*right)))
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return left;
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auto& left_shadow_root = verify_cast<ShadowRoot>(left_root);
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left = left_shadow_root.host();
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}
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}
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// https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke
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bool EventDispatcher::inner_invoke(Event& event, Vector<EventTarget::EventListenerRegistration>& listeners, Event::Phase phase, bool invocation_target_in_shadow_tree)
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{
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bool found = false;
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for (auto& listener : listeners) {
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if (listener.listener->removed())
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continue;
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if (event.type() != listener.listener->type())
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continue;
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found = true;
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if (phase == Event::Phase::CapturingPhase && !listener.listener->capture())
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continue;
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if (phase == Event::Phase::BubblingPhase && listener.listener->capture())
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continue;
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if (listener.listener->once())
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event.current_target()->remove_from_event_listener_list(listener.listener);
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auto& function = listener.listener->function();
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auto& global = function.global_object();
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RefPtr<Event> current_event;
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if (is<Bindings::WindowObject>(global)) {
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auto& bindings_window_global = verify_cast<Bindings::WindowObject>(global);
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auto& window_impl = bindings_window_global.impl();
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current_event = window_impl.current_event();
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if (!invocation_target_in_shadow_tree)
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window_impl.set_current_event(&event);
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}
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if (listener.listener->passive())
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event.set_in_passive_listener(true);
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auto* this_value = Bindings::wrap(global, *event.current_target());
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auto* wrapped_event = Bindings::wrap(global, event);
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auto& vm = global.vm();
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[[maybe_unused]] auto rc = vm.call(listener.listener->function(), this_value, wrapped_event);
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if (vm.exception()) {
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vm.clear_exception();
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// FIXME: Set legacyOutputDidListenersThrowFlag if given. (Only used by IndexedDB currently)
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}
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event.set_in_passive_listener(false);
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if (is<Bindings::WindowObject>(global)) {
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auto& bindings_window_global = verify_cast<Bindings::WindowObject>(global);
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auto& window_impl = bindings_window_global.impl();
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window_impl.set_current_event(current_event);
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}
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if (event.should_stop_immediate_propagation())
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return found;
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}
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return found;
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}
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// https://dom.spec.whatwg.org/#concept-event-listener-invoke
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void EventDispatcher::invoke(Event::PathEntry& struct_, Event& event, Event::Phase phase)
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{
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auto last_valid_shadow_adjusted_target = event.path().last_matching([&struct_](auto& entry) {
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return entry.index <= struct_.index && !entry.shadow_adjusted_target.is_null();
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});
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VERIFY(last_valid_shadow_adjusted_target.has_value());
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event.set_target(last_valid_shadow_adjusted_target.value().shadow_adjusted_target);
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event.set_related_target(struct_.related_target);
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event.set_touch_target_list(struct_.touch_target_list);
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if (event.should_stop_propagation())
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return;
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event.set_current_target(struct_.invocation_target);
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// NOTE: This is an intentional copy. Any event listeners added after this point will not be invoked.
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auto listeners = event.current_target()->listeners();
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bool invocation_target_in_shadow_tree = struct_.invocation_target_in_shadow_tree;
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bool found = inner_invoke(event, listeners, phase, invocation_target_in_shadow_tree);
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if (!found && event.is_trusted()) {
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auto original_event_type = event.type();
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if (event.type() == "animationend")
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event.set_type("webkitAnimationEnd");
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else if (event.type() == "animationiteration")
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event.set_type("webkitAnimationIteration");
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else if (event.type() == "animationstart")
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event.set_type("webkitAnimationStart");
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else if (event.type() == "transitionend")
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event.set_type("webkitTransitionEnd");
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else
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return;
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inner_invoke(event, listeners, phase, invocation_target_in_shadow_tree);
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event.set_type(original_event_type);
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}
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}
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// https://dom.spec.whatwg.org/#concept-event-dispatch
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bool EventDispatcher::dispatch(NonnullRefPtr<EventTarget> target, NonnullRefPtr<Event> event, bool legacy_target_override)
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{
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event->set_dispatched(true);
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RefPtr<EventTarget> target_override;
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if (!legacy_target_override) {
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target_override = target;
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} else {
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// NOTE: This can be done because legacy_target_override is only set for events targeted at Window.
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target_override = verify_cast<Window>(*target).document();
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}
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RefPtr<EventTarget> activation_target;
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RefPtr<EventTarget> related_target = retarget(event->related_target(), target);
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bool clear_targets = false;
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if (related_target != target || event->related_target() == target) {
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Event::TouchTargetList touch_targets;
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for (auto& touch_target : event->touch_target_list()) {
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touch_targets.append(retarget(touch_target, target));
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}
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event->append_to_path(*target, target_override, related_target, touch_targets, false);
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bool is_activation_event = is<UIEvents::MouseEvent>(*event) && event->type() == HTML::EventNames::click;
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if (is_activation_event && target->activation_behaviour)
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activation_target = target;
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// FIXME: Let slottable be target, if target is a slottable and is assigned, and null otherwise.
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bool slot_in_closed_tree = false;
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auto* parent = target->get_parent(event);
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while (parent) {
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// FIXME: If slottable is non-null:
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// FIXME: If parent is a slottable and is assigned, then set slottable to parent.
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related_target = retarget(event->related_target(), parent);
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touch_targets.clear();
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for (auto& touch_target : event->touch_target_list()) {
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touch_targets.append(retarget(touch_target, parent));
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}
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if (is<Window>(parent)
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|| (is<Node>(parent) && verify_cast<Node>(*target).is_shadow_including_inclusive_ancestor_of(verify_cast<Node>(*parent)))) {
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if (is_activation_event && event->bubbles() && !activation_target && parent->activation_behaviour)
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activation_target = parent;
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event->append_to_path(*parent, nullptr, related_target, touch_targets, slot_in_closed_tree);
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} else if (related_target == parent) {
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parent = nullptr;
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} else {
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target = *parent;
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if (is_activation_event && !activation_target && target->activation_behaviour)
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activation_target = target;
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event->append_to_path(*parent, target, related_target, touch_targets, slot_in_closed_tree);
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}
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if (parent) {
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parent = parent->get_parent(event);
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}
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slot_in_closed_tree = false;
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}
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auto clear_targets_struct = event->path().last_matching([](auto& entry) {
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return !entry.shadow_adjusted_target.is_null();
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});
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VERIFY(clear_targets_struct.has_value());
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if (is<Node>(clear_targets_struct.value().shadow_adjusted_target.ptr())) {
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auto& shadow_adjusted_target_node = verify_cast<Node>(*clear_targets_struct.value().shadow_adjusted_target);
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if (is<ShadowRoot>(shadow_adjusted_target_node.root()))
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clear_targets = true;
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}
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if (!clear_targets && is<Node>(clear_targets_struct.value().related_target.ptr())) {
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auto& related_target_node = verify_cast<Node>(*clear_targets_struct.value().related_target);
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if (is<ShadowRoot>(related_target_node.root()))
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clear_targets = true;
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}
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if (!clear_targets) {
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for (auto touch_target : clear_targets_struct.value().touch_target_list) {
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if (is<Node>(*touch_target.ptr())) {
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auto& touch_target_node = verify_cast<Node>(*touch_target.ptr());
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if (is<ShadowRoot>(touch_target_node.root())) {
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clear_targets = true;
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break;
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}
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}
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}
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}
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if (activation_target && activation_target->legacy_pre_activation_behaviour)
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activation_target->legacy_pre_activation_behaviour();
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for (ssize_t i = event->path().size() - 1; i >= 0; --i) {
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auto& entry = event->path().at(i);
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if (entry.shadow_adjusted_target)
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event->set_phase(Event::Phase::AtTarget);
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else
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event->set_phase(Event::Phase::CapturingPhase);
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invoke(entry, event, Event::Phase::CapturingPhase);
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}
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for (auto& entry : event->path()) {
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if (entry.shadow_adjusted_target) {
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event->set_phase(Event::Phase::AtTarget);
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} else {
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if (!event->bubbles())
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continue;
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event->set_phase(Event::Phase::BubblingPhase);
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}
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invoke(entry, event, Event::Phase::BubblingPhase);
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}
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}
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event->set_phase(Event::Phase::None);
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event->set_current_target(nullptr);
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event->clear_path();
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event->set_dispatched(false);
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event->set_stop_propagation(false);
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event->set_stop_immediate_propagation(false);
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if (clear_targets) {
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event->set_target(nullptr);
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event->set_related_target(nullptr);
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event->clear_touch_target_list();
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}
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if (activation_target) {
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if (!event->cancelled()) {
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// NOTE: Since activation_target is set, it will have activation behaviour.
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activation_target->activation_behaviour(event);
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} else {
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if (activation_target->legacy_cancelled_activation_behaviour)
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activation_target->legacy_cancelled_activation_behaviour();
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}
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}
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return !event->cancelled();
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}
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}
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