mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Joshua Gross
309de462bd
Summary: iOS and other platforms have direct access to C++ StateT structs, whereas Java only has access to a Java map equivalent - state updates from Java can't update complex types, or must incur significant cost to reconstruct large objects from their folly::dynamic representation (not to mention the complexity of implementing the Java-to-C++ struct converters). Thus it's hard for Java to update StateT's with complex types on the C++ side. This diff makes a minor change to Android's updateState which uses both the folly::dynamic data from Java as well as the previous State, so each StateT can have fields that are read-only from the Java perspective. Motivation: For AndroidTextInput we need to set params from Java, without being able to send all of the State params from Java. In this diff, we introduce a new State constructor that takes the previous State value and a folly::dynamic. It is up to each State implementation how the additional parameter will be used. We migrate every existing component except for AndroidTextInput in this diff. Changelog: [Internal] Reviewed By: mdvacca Differential Revision: D18672365 fbshipit-source-id: 4469e0a3c7658c204089c6fed39394979883f124
41 lines
765 B
C++
41 lines
765 B
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/graphics/Geometry.h>
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#include <folly/dynamic.h>
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namespace facebook {
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namespace react {
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/*
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* State for <ScrollView> component.
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*/
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class ScrollViewState final {
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public:
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Point contentOffset;
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Rect contentBoundingRect;
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/*
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* Returns size of scrollable area.
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*/
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Size getContentSize() const;
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#ifdef ANDROID
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ScrollViewState() = default;
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ScrollViewState(ScrollViewState const &previousState, folly::dynamic data){};
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folly::dynamic getDynamic() const {
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return {};
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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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