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45 lines
1.2 KiB
45 lines
1.2 KiB
/*
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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 <react/renderer/mounting/MountingCoordinator.h>
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namespace facebook {
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namespace react {
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class ShadowTree;
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/*
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* Abstract class for ShadowTree's delegate.
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*/
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class ShadowTreeDelegate {
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public:
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/*
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* Called right before a ShadowTree commits a new tree.
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* The receiver can alter a new (proposed) shadow tree with another tree
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* by returning the altered tree.
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* Returning a `nullptr` cancels the commit.
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*/
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virtual RootShadowNode::Unshared shadowTreeWillCommit(
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ShadowTree const &shadowTree,
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RootShadowNode::Shared const &oldRootShadowNode,
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RootShadowNode::Unshared const &newRootShadowNode) const = 0;
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/*
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* Called right after Shadow Tree commit a new state of the tree.
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*/
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virtual void shadowTreeDidFinishTransaction(
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ShadowTree const &shadowTree,
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MountingCoordinator::Shared const &mountingCoordinator) const = 0;
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virtual ~ShadowTreeDelegate() noexcept = default;
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};
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} // namespace react
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} // namespace facebook
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