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9b7f6abd87
Summary: `onLayout` event is fired when some layoutable node got inserted or updated (with changed layout) during commit phase. Reviewed By: fkgozali Differential Revision: D8119826 fbshipit-source-id: 831003c88fe5c4358a80328aa715be80e484b52e
89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
// Copyright 2004-present Facebook. All Rights Reserved.
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#pragma once
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#include <memory>
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#include <mutex>
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#include <stdatomic.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/view/RootShadowNode.h>
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namespace facebook {
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namespace react {
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class ShadowTree;
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using SharedShadowTree = std::shared_ptr<ShadowTree>;
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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 std::enable_shared_from_this<ShadowTree> {
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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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/*
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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(const SharedRootShadowNode &newRootShadowNode);
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void emitLayoutEvents(const TreeMutationInstructionList &instructions);
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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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