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Share common ShadowNode functionality in BaseTextInputShadowNode for iOS
Summary: [Changelog] [Internal] - Share common ShadowNode functionality in BaseTextInputShadowNode for iOS The current Android and iOS implementations have quite some overlapping functionality. Not sharing common logic makes it also harder to reuse this [functionality] for out of tree platforms. This change moves the current iOS implementation into a shared location. The next change allows to reuse it for Android. Differential Revision: D66901676
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213 changes: 213 additions & 0 deletions
213
...es/react-native/ReactCommon/react/renderer/components/textinput/BaseTextInputShadowNode.h
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,213 @@ | ||
| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| #pragma once | ||
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| #include <react/renderer/attributedstring/AttributedString.h> | ||
| #include <react/renderer/attributedstring/AttributedStringBox.h> | ||
| #include <react/renderer/components/text/BaseTextShadowNode.h> | ||
| #include <react/renderer/components/textinput/BaseTextInputProps.h> | ||
| #include <react/renderer/components/textinput/TextInputState.h> | ||
| #include <react/renderer/components/view/ConcreteViewShadowNode.h> | ||
| #include <react/renderer/components/view/YogaLayoutableShadowNode.h> | ||
| #include <react/renderer/core/LayoutConstraints.h> | ||
| #include <react/renderer/core/LayoutContext.h> | ||
| #include <react/renderer/textlayoutmanager/TextLayoutContext.h> | ||
| #include <react/renderer/textlayoutmanager/TextLayoutManager.h> | ||
| #include <react/utils/ContextContainer.h> | ||
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| namespace facebook::react { | ||
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| /* | ||
| * Base `ShadowNode` for <TextInput> component. | ||
| */ | ||
| template < | ||
| const char* concreteComponentName, | ||
| typename ViewPropsT, | ||
| typename ViewEventEmitterT, | ||
| typename StateDataT, | ||
| bool usesMapBufferForStateData = false> | ||
| class BaseTextInputShadowNode : public ConcreteViewShadowNode< | ||
| concreteComponentName, | ||
| ViewPropsT, | ||
| ViewEventEmitterT, | ||
| StateDataT, | ||
| usesMapBufferForStateData>, | ||
| public BaseTextShadowNode { | ||
| public: | ||
| using BaseShadowNode = ConcreteViewShadowNode< | ||
| concreteComponentName, | ||
| ViewPropsT, | ||
| ViewEventEmitterT, | ||
| StateDataT, | ||
| usesMapBufferForStateData>; | ||
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| using BaseShadowNode::ConcreteViewShadowNode; | ||
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| static ShadowNodeTraits BaseTraits() { | ||
| auto traits = BaseShadowNode::BaseTraits(); | ||
| traits.set(ShadowNodeTraits::Trait::LeafYogaNode); | ||
| traits.set(ShadowNodeTraits::Trait::MeasurableYogaNode); | ||
| traits.set(ShadowNodeTraits::Trait::BaselineYogaNode); | ||
| return traits; | ||
| } | ||
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| /* | ||
| * Associates a shared `TextLayoutManager` with the node. | ||
| * `TextInputShadowNode` uses the manager to measure text content | ||
| * and construct `TextInputState` objects. | ||
| */ | ||
| void setTextLayoutManager( | ||
| std::shared_ptr<const TextLayoutManager> textLayoutManager) { | ||
| Sealable::ensureUnsealed(); | ||
| textLayoutManager_ = std::move(textLayoutManager); | ||
| } | ||
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| protected: | ||
| Size measureContent( | ||
| const LayoutContext& layoutContext, | ||
| const LayoutConstraints& layoutConstraints) const override { | ||
| const auto& props = BaseShadowNode::getConcreteProps(); | ||
| TextLayoutContext textLayoutContext{ | ||
| .pointScaleFactor = layoutContext.pointScaleFactor}; | ||
| return textLayoutManager_ | ||
| ->measure( | ||
| attributedStringBoxToMeasure(layoutContext), | ||
| props.getEffectiveParagraphAttributes(), | ||
| textLayoutContext, | ||
| layoutConstraints) | ||
| .size; | ||
| } | ||
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| void layout(LayoutContext layoutContext) override { | ||
| updateStateIfNeeded(layoutContext); | ||
| BaseShadowNode::layout(layoutContext); | ||
| } | ||
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| Float baseline(const LayoutContext& layoutContext, Size size) const override { | ||
| const auto& props = BaseShadowNode::getConcreteProps(); | ||
| auto attributedString = getAttributedString(layoutContext); | ||
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| if (attributedString.isEmpty()) { | ||
| auto placeholderString = !props.placeholder.empty() | ||
| ? props.placeholder | ||
| : BaseTextShadowNode::getEmptyPlaceholder(); | ||
| auto textAttributes = | ||
| props.getEffectiveTextAttributes(layoutContext.fontSizeMultiplier); | ||
| attributedString.appendFragment( | ||
| {std::move(placeholderString), textAttributes, {}}); | ||
| } | ||
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| // Yoga expects a baseline relative to the Node's border-box edge instead of | ||
| // the content, so we need to adjust by the padding and border widths, which | ||
| // have already been set by the time of baseline alignment | ||
| auto top = YGNodeLayoutGetBorder( | ||
| &(YogaLayoutableShadowNode::yogaNode_), YGEdgeTop) + | ||
| YGNodeLayoutGetPadding( | ||
| &(YogaLayoutableShadowNode::yogaNode_), YGEdgeTop); | ||
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| AttributedStringBox attributedStringBox{attributedString}; | ||
| return textLayoutManager_->baseline( | ||
| attributedStringBox, | ||
| props.getEffectiveParagraphAttributes(), | ||
| size) + | ||
| top; | ||
| } | ||
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| private: | ||
| /* | ||
| * Creates a `State` object if needed. | ||
| */ | ||
| void updateStateIfNeeded(const LayoutContext& layoutContext) { | ||
| Sealable::ensureUnsealed(); | ||
| const auto& stateData = BaseShadowNode::getStateData(); | ||
| const auto& reactTreeAttributedString = getAttributedString(layoutContext); | ||
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| react_native_assert(textLayoutManager_); | ||
| if (stateData.reactTreeAttributedString.isContentEqual( | ||
| reactTreeAttributedString)) { | ||
| return; | ||
| } | ||
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| const auto& props = BaseShadowNode::getConcreteProps(); | ||
| TextInputState newState( | ||
| AttributedStringBox{reactTreeAttributedString}, | ||
| reactTreeAttributedString, | ||
| props.paragraphAttributes, | ||
| props.mostRecentEventCount); | ||
| BaseShadowNode::setStateData(std::move(newState)); | ||
| } | ||
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| /* | ||
| * Returns a `AttributedString` which represents text content of the node. | ||
| */ | ||
| AttributedString getAttributedString( | ||
| const LayoutContext& layoutContext) const { | ||
| const auto& props = BaseShadowNode::getConcreteProps(); | ||
| auto textAttributes = | ||
| props.getEffectiveTextAttributes(layoutContext.fontSizeMultiplier); | ||
| auto attributedString = AttributedString{}; | ||
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| attributedString.appendFragment(AttributedString::Fragment{ | ||
| .string = props.text, | ||
| .textAttributes = textAttributes, | ||
| // TODO: Is this really meant to be by value? | ||
| .parentShadowView = ShadowView(*this)}); | ||
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| auto attachments = BaseTextShadowNode::Attachments{}; | ||
| BaseTextShadowNode::buildAttributedString( | ||
| textAttributes, *this, attributedString, attachments); | ||
| attributedString.setBaseTextAttributes(textAttributes); | ||
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| return attributedString; | ||
| } | ||
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| /* | ||
| * Returns an `AttributedStringBox` which represents text content that should | ||
| * be used for measuring purposes. It might contain actual text value, | ||
| * placeholder value or some character that represents the size of the font. | ||
| */ | ||
| AttributedStringBox attributedStringBoxToMeasure( | ||
| const LayoutContext& layoutContext) const { | ||
| bool meaningfulState = BaseShadowNode::getState() && | ||
| BaseShadowNode::getState()->getRevision() != | ||
| State::initialRevisionValue; | ||
| if (meaningfulState) { | ||
| const auto& stateData = BaseShadowNode::getStateData(); | ||
| auto attributedStringBox = stateData.attributedStringBox; | ||
| if (attributedStringBox.getMode() == | ||
| AttributedStringBox::Mode::OpaquePointer || | ||
| !attributedStringBox.getValue().isEmpty()) { | ||
| return stateData.attributedStringBox; | ||
| } | ||
| } | ||
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| auto attributedString = meaningfulState | ||
| ? AttributedString{} | ||
| : getAttributedString(layoutContext); | ||
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| if (attributedString.isEmpty()) { | ||
| const auto& props = BaseShadowNode::getConcreteProps(); | ||
| auto placeholder = props.placeholder; | ||
| // Note: `zero-width space` is insufficient in some cases (e.g. when we | ||
| // need to measure the "hight" of the font). | ||
| // TODO T67606511: We will redefine the measurement of empty strings as | ||
| // part of T67606511 | ||
| auto string = !placeholder.empty() | ||
| ? placeholder | ||
| : BaseTextShadowNode::getEmptyPlaceholder(); | ||
| auto textAttributes = | ||
| props.getEffectiveTextAttributes(layoutContext.fontSizeMultiplier); | ||
| attributedString.appendFragment({string, textAttributes, {}}); | ||
| } | ||
| return AttributedStringBox{attributedString}; | ||
| } | ||
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| std::shared_ptr<const TextLayoutManager> textLayoutManager_; | ||
| }; | ||
|
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| } // namespace facebook::react |
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