mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
c4876d0313
Summary: The diff implements a new class called `AttributedStringBox` that represents an object storing a shared `AttributedString` *or* a shared pointer to some opaque platform-specific object that can be used as an attributed string. The class serves two main purposes: - Represent type-erased attributed string entity (which can be platform-specific or platform-independent); - Represent a container that can be copied with constant complexity. Why? Several reasons: - Sometimes it makes sense to keep an attributed string as a shared resource. This way we don't need to pay for expensive copying and we also implement a copy-on-write semantics on top of that if needed. - We need to extend a TextLayoutMeasure API to support measuring some platform-specific attributed string implementation to remove the necessity of converting a string back and forth between representations. That's especially important for TextInput because we will need to measure that very efficiently (and the source of measuring, in this case, is a platform attributed string). In other words, we need something to store inside TextInputState to measure and update very efficiently. The source of this data might be a native TextInput control or a data from React, to represent that kinda object we need this data structure (and interfaces that deal with it). Changelog: [Internal] Fabric-specific internal change. Reviewed By: sammy-SC Differential Revision: D18670793 fbshipit-source-id: bc0164f801f28642f7c6da340af12acf33b85d24
127 lines
4.0 KiB
C++
127 lines
4.0 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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#include "AndroidTextInputShadowNode.h"
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#include <fb/fbjni.h>
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#include <react/attributedstring/AttributedStringBox.h>
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#include <react/attributedstring/TextAttributes.h>
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#include <react/components/text/BaseTextShadowNode.h>
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#include <react/core/LayoutConstraints.h>
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#include <react/core/LayoutContext.h>
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#include <react/core/conversions.h>
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#include <react/jni/ReadableNativeMap.h>
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#include <Glog/logging.h>
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using namespace facebook::jni;
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namespace facebook {
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namespace react {
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extern const char AndroidTextInputComponentName[] = "AndroidTextInput";
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void AndroidTextInputShadowNode::setContextContainer(
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ContextContainer *contextContainer) {
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ensureUnsealed();
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contextContainer_ = contextContainer;
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}
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AttributedString AndroidTextInputShadowNode::getAttributedString(
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bool usePlaceholders) const {
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auto textAttributes = TextAttributes::defaultTextAttributes();
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textAttributes.apply(getProps()->textAttributes);
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// Use BaseTextShadowNode to get attributed string from children
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auto const &attributedString =
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BaseTextShadowNode::getAttributedString(textAttributes, *this);
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if (!attributedString.isEmpty()) {
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return attributedString;
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}
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if (!getProps()->text.empty() || usePlaceholders) {
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// If the BaseTextShadowNode didn't detect any child Text nodes, we
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// may actually just have a `text` attribute.
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// TODO: figure out why BaseTextShadowNode doesn't pick this up, this
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// is a bug. A minimal Playground example that triggers this: P122991121
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auto textAttributedString = AttributedString{};
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auto fragment = AttributedString::Fragment{};
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fragment.string = getProps()->text;
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if (usePlaceholders) {
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// Return placeholder text instead, if text was empty.
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if (fragment.string.empty()) {
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fragment.string = getProps()->placeholder;
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}
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// For measurement purposes, we want to make sure that there's at least a
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// single character in the string so that the measured height is greater
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// than zero. Otherwise, empty TextInputs with no placeholder don't
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// display at all.
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if (fragment.string.empty()) {
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fragment.string = " ";
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}
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}
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fragment.textAttributes = textAttributes;
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fragment.parentShadowView = ShadowView(*this);
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textAttributedString.appendFragment(fragment);
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return textAttributedString;
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}
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return attributedString;
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}
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void AndroidTextInputShadowNode::setTextLayoutManager(
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SharedTextLayoutManager textLayoutManager) {
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ensureUnsealed();
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textLayoutManager_ = textLayoutManager;
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}
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void AndroidTextInputShadowNode::updateStateIfNeeded() {
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ensureUnsealed();
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auto attributedString = getAttributedString(false);
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auto const &state = getStateData();
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assert(textLayoutManager_);
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assert(
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(!state.layoutManager || state.layoutManager == textLayoutManager_) &&
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"`StateData` refers to a different `TextLayoutManager`");
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if (state.attributedString == attributedString &&
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state.layoutManager == textLayoutManager_) {
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return;
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}
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setStateData(AndroidTextInputState{state.mostRecentEventCount,
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attributedString,
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getProps()->paragraphAttributes,
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textLayoutManager_});
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}
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#pragma mark - LayoutableShadowNode
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Size AndroidTextInputShadowNode::measure(
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LayoutConstraints layoutConstraints) const {
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AttributedString attributedString = getAttributedString(true);
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if (attributedString.isEmpty()) {
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return {0, 0};
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}
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return textLayoutManager_->measure(
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AttributedStringBox{attributedString},
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getProps()->paragraphAttributes,
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layoutConstraints);
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}
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void AndroidTextInputShadowNode::layout(LayoutContext layoutContext) {
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updateStateIfNeeded();
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ConcreteViewShadowNode::layout(layoutContext);
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}
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} // namespace react
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} // namespace facebook
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