mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin SherginandFacebook Github Bot
9349ee26e7
Summary: This diff makes it clear from the code that ShadowTree delegate must be around for the whole life-time of a ShadowTree instance and there is no way to revoke/reset the delegate. This makes reasoning about the lifetime much simpler. We didn't call `setDelegate(nullptr)` before, so nothing really changes here. Changelog: [Internal] Fabric-specific internal change. Reviewed By: mdvacca Differential Revision: D18542502 fbshipit-source-id: f57ee21e0bb533fb82cb6f8ba7723e40ffb25a38
90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
|
|
#include <better/mutex.h>
|
|
#include <memory>
|
|
|
|
#include <react/components/root/RootComponentDescriptor.h>
|
|
#include <react/components/root/RootShadowNode.h>
|
|
#include <react/core/LayoutConstraints.h>
|
|
#include <react/core/ReactPrimitives.h>
|
|
#include <react/core/ShadowNode.h>
|
|
#include <react/mounting/MountingCoordinator.h>
|
|
#include <react/mounting/ShadowTreeDelegate.h>
|
|
#include <react/mounting/ShadowTreeRevision.h>
|
|
|
|
namespace facebook {
|
|
namespace react {
|
|
|
|
using ShadowTreeCommitTransaction = std::function<RootShadowNode::Unshared(
|
|
RootShadowNode::Shared const &oldRootShadowNode)>;
|
|
|
|
/*
|
|
* Represents the shadow tree and its lifecycle.
|
|
*/
|
|
class ShadowTree final {
|
|
public:
|
|
/*
|
|
* Creates a new shadow tree instance.
|
|
*/
|
|
ShadowTree(
|
|
SurfaceId surfaceId,
|
|
LayoutConstraints const &layoutConstraints,
|
|
LayoutContext const &layoutContext,
|
|
RootComponentDescriptor const &rootComponentDescriptor,
|
|
ShadowTreeDelegate const &delegate);
|
|
|
|
~ShadowTree();
|
|
|
|
/*
|
|
* Returns the `SurfaceId` associated with the shadow tree.
|
|
*/
|
|
SurfaceId getSurfaceId() const;
|
|
|
|
/*
|
|
* Performs commit calling `transaction` function with a `oldRootShadowNode`
|
|
* and expecting a `newRootShadowNode` as a return value.
|
|
* The `transaction` function can abort commit returning `nullptr`.
|
|
* Returns `true` if the operation finished successfully.
|
|
*/
|
|
bool tryCommit(ShadowTreeCommitTransaction transaction) const;
|
|
|
|
/*
|
|
* Calls `tryCommit` in a loop until it finishes successfully.
|
|
*/
|
|
void commit(ShadowTreeCommitTransaction transaction) const;
|
|
|
|
/*
|
|
* Commit an empty tree (a new `RootShadowNode` with no children).
|
|
*/
|
|
void commitEmptyTree() const;
|
|
|
|
private:
|
|
RootShadowNode::Unshared cloneRootShadowNode(
|
|
RootShadowNode::Shared const &oldRootShadowNode,
|
|
LayoutConstraints const &layoutConstraints,
|
|
LayoutContext const &layoutContext) const;
|
|
|
|
void emitLayoutEvents(
|
|
std::vector<LayoutableShadowNode const *> &affectedLayoutableNodes) const;
|
|
|
|
SurfaceId const surfaceId_;
|
|
ShadowTreeDelegate const &delegate_;
|
|
mutable better::shared_mutex commitMutex_;
|
|
mutable RootShadowNode::Shared
|
|
rootShadowNode_; // Protected by `commitMutex_`.
|
|
mutable ShadowTreeRevision::Number revisionNumber_{
|
|
0}; // Protected by `commitMutex_`.
|
|
MountingCoordinator::Shared mountingCoordinator_;
|
|
};
|
|
|
|
} // namespace react
|
|
} // namespace facebook
|