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LibWeb: Implement Event.composedPath
I originally implemented this as something to use the new sequence wrapper, however, after having a look at uses with grep.app, it's used often, for example: - Bootstrap 5 Dropdowns - Polymer - Angular - Closure
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@ -1,5 +1,6 @@
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/*
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* Copyright (c) 2020, the SerenityOS developers.
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* Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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@ -64,4 +65,119 @@ double Event::time_stamp() const
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return m_time_stamp;
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}
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// https://dom.spec.whatwg.org/#dom-event-composedpath
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NonnullRefPtrVector<EventTarget> Event::composed_path() const
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{
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// 1. Let composedPath be an empty list.
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NonnullRefPtrVector<EventTarget> composed_path;
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// 2. Let path be this’s path. (NOTE: Not necessary)
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// 3. If path is empty, then return composedPath.
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if (m_path.is_empty())
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return composed_path;
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// 4. Let currentTarget be this’s currentTarget attribute value. (NOTE: Not necessary)
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// 5. Append currentTarget to composedPath.
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// NOTE: If path is not empty, then the event is being dispatched and will have a currentTarget.
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VERIFY(m_current_target);
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composed_path.append(*m_current_target);
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// 6. Let currentTargetIndex be 0.
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size_t current_target_index = 0;
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// 7. Let currentTargetHiddenSubtreeLevel be 0.
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size_t current_target_hidden_subtree_level = 0;
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// 8. Let index be path’s size − 1.
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// 9. While index is greater than or equal to 0:
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for (ssize_t index = m_path.size() - 1; index >= 0; --index) {
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auto& path_entry = m_path.at(index);
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// 1. If path[index]'s root-of-closed-tree is true, then increase currentTargetHiddenSubtreeLevel by 1.
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if (path_entry.root_of_closed_tree)
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++current_target_hidden_subtree_level;
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// 2. If path[index]'s invocation target is currentTarget, then set currentTargetIndex to index and break.
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if (path_entry.invocation_target == m_current_target) {
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current_target_index = index;
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break;
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}
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// 3. If path[index]'s slot-in-closed-tree is true, then decrease currentTargetHiddenSubtreeLevel by 1.
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if (path_entry.slot_in_closed_tree)
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--current_target_hidden_subtree_level;
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// 4. Decrease index by 1.
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}
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// 10. Let currentHiddenLevel and maxHiddenLevel be currentTargetHiddenSubtreeLevel.
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size_t current_hidden_level = current_target_hidden_subtree_level;
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size_t max_hidden_level = current_target_hidden_subtree_level;
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// 11. Set index to currentTargetIndex − 1.
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// 12. While index is greater than or equal to 0:
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for (ssize_t index = current_target_index - 1; index >= 0; --index) {
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auto& path_entry = m_path.at(index);
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// 1. If path[index]'s root-of-closed-tree is true, then increase currentHiddenLevel by 1.
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if (path_entry.root_of_closed_tree)
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++current_hidden_level;
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// 2. If currentHiddenLevel is less than or equal to maxHiddenLevel, then prepend path[index]'s invocation target to composedPath.
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if (current_hidden_level <= max_hidden_level) {
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VERIFY(path_entry.invocation_target);
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composed_path.prepend(*path_entry.invocation_target);
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}
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// 3. If path[index]'s slot-in-closed-tree is true, then:
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if (path_entry.slot_in_closed_tree) {
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// 1. Decrease currentHiddenLevel by 1.
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--current_hidden_level;
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// 2. If currentHiddenLevel is less than maxHiddenLevel, then set maxHiddenLevel to currentHiddenLevel.
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if (current_hidden_level < max_hidden_level)
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max_hidden_level = current_hidden_level;
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}
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// 4. Decrease index by 1.
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}
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// 13. Set currentHiddenLevel and maxHiddenLevel to currentTargetHiddenSubtreeLevel.
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current_hidden_level = current_target_hidden_subtree_level;
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max_hidden_level = current_target_hidden_subtree_level;
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// 14. Set index to currentTargetIndex + 1.
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// 15. While index is less than path’s size:
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for (size_t index = current_target_index + 1; index < m_path.size(); ++index) {
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auto& path_entry = m_path.at(index);
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// 1. If path[index]'s slot-in-closed-tree is true, then increase currentHiddenLevel by 1.
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if (path_entry.slot_in_closed_tree)
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++current_hidden_level;
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// 2. If currentHiddenLevel is less than or equal to maxHiddenLevel, then append path[index]'s invocation target to composedPath.
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if (current_hidden_level <= max_hidden_level) {
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VERIFY(path_entry.invocation_target);
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composed_path.append(*path_entry.invocation_target);
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}
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// 3. If path[index]'s root-of-closed-tree is true, then:
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if (path_entry.root_of_closed_tree) {
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// 1. Decrease currentHiddenLevel by 1.
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--current_hidden_level;
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// 2. If currentHiddenLevel is less than maxHiddenLevel, then set maxHiddenLevel to currentHiddenLevel.
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if (current_hidden_level < max_hidden_level)
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max_hidden_level = current_hidden_level;
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}
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// 4. Increase index by 1.
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}
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// 16. Return composedPath.
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return composed_path;
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}
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}
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@ -146,6 +146,8 @@ public:
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void set_time_stamp(double time_stamp) { m_time_stamp = time_stamp; }
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NonnullRefPtrVector<EventTarget> composed_path() const;
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protected:
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explicit Event(FlyString const& type)
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: m_type(type)
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@ -6,6 +6,7 @@ interface Event {
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readonly attribute EventTarget? target;
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readonly attribute EventTarget? srcTarget;
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readonly attribute EventTarget? currentTarget;
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sequence<EventTarget> composedPath();
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readonly attribute unsigned short eventPhase;
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