91 строка
2.7 KiB
C++
91 строка
2.7 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates.
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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 <better/mutex.h>
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#include <memory>
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#include <react/components/root/RootComponentDescriptor.h>
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#include <react/components/root/RootShadowNode.h>
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#include <react/core/LayoutConstraints.h>
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#include <react/core/ReactPrimitives.h>
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#include <react/core/ShadowNode.h>
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#include <react/mounting/MountingCoordinator.h>
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#include <react/mounting/ShadowTreeDelegate.h>
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#include <react/mounting/ShadowTreeRevision.h>
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namespace facebook {
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namespace react {
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using ShadowTreeCommitTransaction = std::function<UnsharedRootShadowNode(
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const SharedRootShadowNode &oldRootShadowNode)>;
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/*
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* Represents the shadow tree and its lifecycle.
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*/
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class ShadowTree final {
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public:
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/*
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* Creates a new shadow tree instance.
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*/
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ShadowTree(
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SurfaceId surfaceId,
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const LayoutConstraints &layoutConstraints,
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const LayoutContext &layoutContext,
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const RootComponentDescriptor &rootComponentDescriptor);
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~ShadowTree();
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/*
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* Returns the `SurfaceId` associated with the shadow tree.
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*/
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SurfaceId getSurfaceId() const;
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/*
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* Performs commit calling `transaction` function with a `oldRootShadowNode`
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* and expecting a `newRootShadowNode` as a return value.
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* The `transaction` function can abort commit returning `nullptr`.
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* Returns `true` if the operation finished successfully.
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*/
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bool tryCommit(ShadowTreeCommitTransaction transaction) const;
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/*
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* Calls `tryCommit` in a loop until it finishes successfully.
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*/
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void commit(ShadowTreeCommitTransaction transaction) const;
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#pragma mark - Delegate
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/*
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* Sets and gets the delegate.
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* The delegate is stored as a raw pointer, so the owner must null
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* the pointer before being destroyed.
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*/
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void setDelegate(ShadowTreeDelegate const *delegate);
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ShadowTreeDelegate const *getDelegate() const;
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private:
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UnsharedRootShadowNode cloneRootShadowNode(
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const SharedRootShadowNode &oldRootShadowNode,
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const LayoutConstraints &layoutConstraints,
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const LayoutContext &layoutContext) const;
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void emitLayoutEvents(
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std::vector<LayoutableShadowNode const *> &affectedLayoutableNodes) const;
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SurfaceId const surfaceId_;
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mutable better::shared_mutex commitMutex_;
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mutable SharedRootShadowNode rootShadowNode_; // Protected by `commitMutex_`.
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mutable ShadowTreeRevision::Number revisionNumber_{
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0}; // Protected by `commitMutex_`.
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ShadowTreeDelegate const *delegate_;
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MountingCoordinator::Shared mountingCoordinator_;
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};
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} // namespace react
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} // namespace facebook
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