72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <functional>
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#include <initializer_list>
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#include <memory>
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#include <react/renderer/components/view/primitives.h>
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#include <react/renderer/core/ReactPrimitives.h>
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#include <react/renderer/core/ShadowNode.h>
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#include <react/renderer/uimanager/UIManager.h>
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namespace facebook::react {
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class PointerHoverTracker {
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public:
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using Unique = std::unique_ptr<PointerHoverTracker>;
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using EventPath = std::vector<std::reference_wrapper<const ShadowNode>>;
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PointerHoverTracker(ShadowNode::Shared target, const UIManager& uiManager);
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const ShadowNode* getTarget(const UIManager& uiManager) const;
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bool hasSameTarget(const PointerHoverTracker& other) const;
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bool areAnyTargetsListeningToEvents(
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std::initializer_list<ViewEvents::Offset> eventTypes,
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const UIManager& uiManager) const;
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/**
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* Performs a diff between the current and given trackers and returns a tuple
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* containing [1]: the nodes that have been removed and [2]: the nodes that
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* have been added. Note that the order of these lists are from parents ->
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* children.
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*/
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std::tuple<EventPath, EventPath> diffEventPath(
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const PointerHoverTracker& other,
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const UIManager& uiManager) const;
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void markAsOld();
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private:
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/**
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* Flag that lets the tracker know if it needs to fetch the latest version of
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* the shadow node or not.
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*/
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bool isOldTracker_ = false;
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ShadowNode::Shared root_;
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ShadowNode::Shared target_;
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/**
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* A thin wrapper around `UIManager::getNewestCloneOfShadowNode` that only
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* actually gets the newest clone only if the tracker is marked as "old".
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*/
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const ShadowNode* getLatestNode(
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const ShadowNode& node,
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const UIManager& uiManager) const;
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/**
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* Retrieves the list of shadow node references in the event's path starting
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* from the target node to the root node.
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*/
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EventPath getEventPathTargets() const;
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};
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} // namespace facebook::react
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