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https://github.com/status-im/react-native.git
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c25d5948a5
Summary: As we did in the previous diff, here we implemented `EventEmitter`'s ownership model as a `shared_ptr`. This change fixes problem with leaking `WeakObject`s which happens on hot-reload. So, in short: * `EventTargetWrapper` object owns `jsi::WeakObject` that can be converted to actual `jsi::Object` that represent event target in JavaScript realm; * `EventTargetWrapper` and `jsi::WeakObject` objects must be deallocated as soon as native part does not need them anymore; * `EventEmitter` objects retain `EventTarget` objects; * `EventEmitter` can loose event target object in case if assosiated `ShadowNode` got unmounted (not deallocated); in this case `EventEmitter` is loosing possibility to dispatch event even if some mounting-layer code is still retaining it. Reviewed By: mdvacca Differential Revision: D9762755 fbshipit-source-id: 96e989767a32914db9f4627fce51b044c71f257a
94 lines
2.5 KiB
C++
94 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 <memory>
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#include <mutex>
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#include <fabric/components/root/RootShadowNode.h>
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#include <fabric/core/LayoutConstraints.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/uimanager/ShadowTreeDelegate.h>
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#include <fabric/uimanager/ShadowViewMutation.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 with given `rootTag`.
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*/
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ShadowTree(Tag rootTag);
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~ShadowTree();
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/*
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* Returns the rootTag associated with the shadow tree (the tag of the
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* root shadow node).
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*/
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Tag getRootTag() const;
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#pragma mark - Layout
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/*
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* Measures the shadow tree with given `layoutConstraints` and `layoutContext`.
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* Can be called from any thread, side-effect-less.
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*/
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Size measure(const LayoutConstraints &layoutConstraints, const LayoutContext &layoutContext) const;
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/*
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* Applies given `layoutConstraints` and `layoutContext` and commit
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* the new shadow tree.
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* Can be called from any thread.
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*/
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void constraintLayout(const LayoutConstraints &layoutConstraints, const LayoutContext &layoutContext);
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#pragma mark - Application
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/*
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* Create a new shadow tree with given `rootChildNodes` and commit.
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* Can be called from any thread.
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*/
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void complete(const SharedShadowNodeUnsharedList &rootChildNodes);
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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 *delegate);
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ShadowTreeDelegate *getDelegate() const;
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private:
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UnsharedRootShadowNode cloneRootShadowNode(const LayoutConstraints &layoutConstraints, const LayoutContext &layoutContext) const;
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void complete(UnsharedRootShadowNode newRootShadowNode);
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bool commit(
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const SharedRootShadowNode &oldRootShadowNode,
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const SharedRootShadowNode &newRootShadowNode,
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const ShadowViewMutationList &mutations
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);
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void toggleEventEmitters(const ShadowViewMutationList &mutations);
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void emitLayoutEvents(const ShadowViewMutationList &mutations);
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const Tag rootTag_;
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SharedRootShadowNode rootShadowNode_;
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ShadowTreeDelegate *delegate_;
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mutable std::mutex commitMutex_;
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};
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} // namespace react
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} // namespace facebook
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