92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
// Copyright (c) 2004-present, Facebook, Inc.
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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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/*
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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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