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5c83855c75
Summary: @public We need some another object like ShadowNode (but not ShadowNode) to represent an instance of the component in the mutation instructions. This is the main motivation for introducing ShadowView. Why not use ShadowNode? ShadowNode is designed to represent a node in ShadowTree, not be a part of a mutation instruction. * ShadowNode exposes some APIs that should not be exposed to the mounting layer; * ShadowNode is an immutable data structure, so we cannot mutate it in some way which can be meaningful for mounting; * We should not add to ShadowNode any functionality which is needed only for mounting; * ShadowNode is a bit more heavy object to share that it needs to be; it's exposed (embedded into Mutation) as a `shared_ptr` which is not optimal from the performance perspective; * Retaining ShadowNode from mounting code can unnecessarily extend its lifetime which can negatively affect memory usage. Reviewed By: mdvacca Differential Revision: D9403562 fbshipit-source-id: 72ad81ed918157a62cd3d1a03261f14447649d0b
62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
// Copyright (c) 2004-present, Facebook, Inc.
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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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#pragma once
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#include <fabric/core/LayoutMetrics.h>
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#include <fabric/core/LocalData.h>
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#include <fabric/core/Props.h>
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#include <fabric/core/ReactPrimitives.h>
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#include <fabric/core/ShadowNode.h>
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#include <fabric/events/EventEmitter.h>
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namespace facebook {
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namespace react {
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/*
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* Describes a view that can be mounted.
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*/
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struct ShadowView final {
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ShadowView() = default;
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ShadowView(const ShadowView &shadowView) = default;
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/*
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* Constructs a `ShadowView` from given `ShadowNode`.
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*/
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explicit ShadowView(const ShadowNode &shadowNode);
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ShadowView &operator=(const ShadowView &other) = default;
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bool operator==(const ShadowView &rhs) const;
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bool operator!=(const ShadowView &rhs) const;
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ComponentName componentName = "";
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ComponentHandle componentHandle = 0;
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Tag tag = -1;
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SharedProps props = {};
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SharedEventEmitter eventEmitter = {};
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LayoutMetrics layoutMetrics = EmptyLayoutMetrics;
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SharedLocalData localData = {};
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};
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/*
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* Describes pair of a `ShadowView` and a `ShadowNode`.
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*/
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struct ShadowViewNodePair final {
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const ShadowView shadowView;
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const ShadowNode &shadowNode;
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/*
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* The stored pointer to `ShadowNode` represents an indentity of the pair.
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*/
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bool operator==(const ShadowViewNodePair &rhs) const;
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bool operator!=(const ShadowViewNodePair &rhs) const;
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};
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using ShadowViewNodePairList = std::vector<ShadowViewNodePair>;
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} // namespace react
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} // namespace facebook
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