mirror of
https://github.com/zhigang1992/react-native.git
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90e49d759c
Summary: That should reduce the size of `ShadowNode`, make an instantiation of shadowNode a bit faster, and make `clone` operation a bit faster because simple dynamic dispatch is faster than std::function invocation. It also should help a bit with code size. Reviewed By: mdvacca Differential Revision: D14249200 fbshipit-source-id: c1332b139d27becebf15cd894475507b5fd0eb9f
140 lines
4.7 KiB
C++
140 lines
4.7 KiB
C++
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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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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*/
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#pragma once
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#include <react/components/view/AccessibleShadowNode.h>
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#include <react/components/view/ViewEventEmitter.h>
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#include <react/components/view/ViewProps.h>
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#include <react/components/view/YogaLayoutableShadowNode.h>
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#include <react/core/ConcreteShadowNode.h>
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#include <react/core/LayoutableShadowNode.h>
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#include <react/core/ShadowNode.h>
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#include <react/core/ShadowNodeFragment.h>
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#include <react/debug/DebugStringConvertibleItem.h>
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namespace facebook {
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namespace react {
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/*
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* Template for all <View>-like classes (classes which have all same props
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* as <View> and similar basic behaviour).
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* For example: <Paragraph>, <Image>, but not <Text>, <RawText>.
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*/
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template <
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const char *concreteComponentName,
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typename ViewPropsT = ViewProps,
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typename ViewEventEmitterT = ViewEventEmitter,
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typename... Ts>
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class ConcreteViewShadowNode : public ConcreteShadowNode<
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concreteComponentName,
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ViewPropsT,
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ViewEventEmitterT,
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Ts...>,
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public AccessibleShadowNode,
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public YogaLayoutableShadowNode {
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static_assert(
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std::is_base_of<ViewProps, ViewPropsT>::value,
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"ViewPropsT must be a descendant of ViewProps");
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static_assert(
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std::is_base_of<YogaStylableProps, ViewPropsT>::value,
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"ViewPropsT must be a descendant of YogaStylableProps");
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static_assert(
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std::is_base_of<AccessibilityProps, ViewPropsT>::value,
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"ViewPropsT must be a descendant of AccessibilityProps");
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public:
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using BaseShadowNode = ConcreteShadowNode<
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concreteComponentName,
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ViewPropsT,
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ViewEventEmitterT,
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Ts...>;
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using ConcreteViewProps = ViewPropsT;
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ConcreteViewShadowNode(
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const ShadowNodeFragment &fragment,
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const ComponentDescriptor &componentDescriptor)
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: BaseShadowNode(fragment, componentDescriptor),
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AccessibleShadowNode(
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std::static_pointer_cast<const ConcreteViewProps>(fragment.props)),
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YogaLayoutableShadowNode() {
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YogaLayoutableShadowNode::setProps(
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*std::static_pointer_cast<const ConcreteViewProps>(fragment.props));
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YogaLayoutableShadowNode::setChildren(
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BaseShadowNode::template getChildrenSlice<YogaLayoutableShadowNode>());
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};
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ConcreteViewShadowNode(
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const ShadowNode &sourceShadowNode,
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const ShadowNodeFragment &fragment)
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: BaseShadowNode(sourceShadowNode, fragment),
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AccessibleShadowNode(
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static_cast<const ConcreteViewShadowNode &>(sourceShadowNode),
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std::static_pointer_cast<const ConcreteViewProps>(fragment.props)),
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YogaLayoutableShadowNode(
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static_cast<const ConcreteViewShadowNode &>(sourceShadowNode)) {
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if (fragment.props) {
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YogaLayoutableShadowNode::setProps(
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*std::static_pointer_cast<const ConcreteViewProps>(fragment.props));
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}
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if (fragment.children) {
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YogaLayoutableShadowNode::setChildren(
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BaseShadowNode::template getChildrenSlice<
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YogaLayoutableShadowNode>());
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}
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};
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void appendChild(const SharedShadowNode &child) {
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ensureUnsealed();
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ShadowNode::appendChild(child);
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auto nonConstChild = const_cast<ShadowNode *>(child.get());
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auto yogaLayoutableChild =
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dynamic_cast<YogaLayoutableShadowNode *>(nonConstChild);
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if (yogaLayoutableChild) {
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YogaLayoutableShadowNode::appendChild(yogaLayoutableChild);
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}
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}
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LayoutableShadowNode *cloneAndReplaceChild(
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LayoutableShadowNode *child,
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int suggestedIndex = -1) override {
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ensureUnsealed();
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auto childShadowNode = static_cast<const ConcreteViewShadowNode *>(child);
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auto clonedChildShadowNode =
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std::static_pointer_cast<ConcreteViewShadowNode>(
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childShadowNode->clone({}));
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ShadowNode::replaceChild(
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childShadowNode->shared_from_this(),
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clonedChildShadowNode,
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suggestedIndex);
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return clonedChildShadowNode.get();
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}
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#pragma mark - DebugStringConvertible
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#if RN_DEBUG_STRING_CONVERTIBLE
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SharedDebugStringConvertibleList getDebugProps() const override {
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auto list = SharedDebugStringConvertibleList{};
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auto basePropsList = ShadowNode::getDebugProps();
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std::move(
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basePropsList.begin(), basePropsList.end(), std::back_inserter(list));
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list.push_back(std::make_shared<DebugStringConvertibleItem>(
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"layout", "", LayoutableShadowNode::getDebugProps()));
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return list;
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}
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#endif
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};
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} // namespace react
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} // namespace facebook
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