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https://github.com/status-im/react-native.git
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7d630b92dc
Summary: This diff implements a new algorithm that effectively marks `EventEmitter`s enabled or disabled. The previous implementation relied on a list of mutation instructions whereas the new one analyzes the shadow trees. The mutations-based approach didn't work well because mutations describe `ShadowView`s whereas some `ShadowNode`s are simply not views (like VirtualText), but we have to enable/disable them anyway. Reviewed By: sahrens Differential Revision: D13642594 fbshipit-source-id: 12169e11d5685e50bcd0d8c410498c594df744b4
84 lines
2.5 KiB
C++
84 lines
2.5 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 <folly/SharedMutex.h>
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#include <memory>
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#include <shared_mutex>
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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/ShadowViewMutation.h>
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#include <react/uimanager/ShadowTreeDelegate.h>
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namespace facebook {
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namespace react {
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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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~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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* If a `revision` pointer is not null, the method will store there a
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* contiguous revision number of the successfully performed transaction.
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* Specify `attempts` to allow performing multiple tries.
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* Returns `true` if the operation finished successfully.
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*/
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bool commit(
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std::function<UnsharedRootShadowNode(
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const SharedRootShadowNode &oldRootShadowNode)> transaction,
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int attempts = 1,
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int *revision = nullptr) 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(const ShadowViewMutationList &mutations) const;
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const SurfaceId surfaceId_;
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mutable folly::SharedMutex commitMutex_;
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mutable SharedRootShadowNode rootShadowNode_; // Protected by `commitMutex_`.
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mutable int revision_{1}; // Protected by `commitMutex_`.
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ShadowTreeDelegate const *delegate_;
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};
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} // namespace react
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} // namespace facebook
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