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4e841f2114
Summary: When a user clicks on some text, `RCTSurfaceTouchHandler` will call into a method on `RCTParagraphComponentView`. That method (i.e: `touchEventEmitter`) would be responsible for identifying the closest ancestral `<Text/>` component to which we should dispatch the `onPress` event, given the point where the user clicked. To answer this query, we'll use a data structure called `UIAttributedString`. This data structure represents a string, and a corresponding mapping from sequences of its characters to some arbitrary data. In this attributed string, we'll map sequences of characters to their closest ancestral `ParagraphShadowNode` or `TextShadowNode`. That way, when we get a click event on `RCTParagraphComponentView`, we can just look at the character that was clicked, and use that information to do a lookup in the attributed string to find the shadow node who's EventEmitter is responsible for processing the click event. Reviewed By: shergin Differential Revision: D9696904 fbshipit-source-id: a199649981ad271afa85414ce4c3f056851348be
81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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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 <memory>
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#include <fabric/attributedstring/TextAttributes.h>
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#include <fabric/core/Sealable.h>
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#include <fabric/core/ShadowNode.h>
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#include <fabric/debug/DebugStringConvertible.h>
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#include <folly/Optional.h>
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namespace facebook {
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namespace react {
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class AttributedString;
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using SharedAttributedString = std::shared_ptr<const AttributedString>;
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/*
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* Simple, cross-platfrom, React-specific implementation of attributed string
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* (aka spanned string).
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* `AttributedString` is basically a list of `Fragments` which have `string` and
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* `textAttributes` + `shadowNode` associated with the `string`.
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*/
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class AttributedString:
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public Sealable,
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public DebugStringConvertible {
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public:
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class Fragment {
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public:
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std::string string;
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TextAttributes textAttributes;
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SharedShadowNode shadowNode;
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SharedShadowNode parentShadowNode;
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};
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using Fragments = std::vector<Fragment>;
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/*
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* Appends and prepends a `fragment` to the string.
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*/
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void appendFragment(const Fragment &fragment);
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void prependFragment(const Fragment &fragment);
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/*
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* Appends and prepends an `attributedString` (all its fragments) to
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* the string.
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*/
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void appendAttributedString(const AttributedString &attributedString);
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void prependAttributedString(const AttributedString &attributedString);
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/*
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* Returns read-only reference to a list of fragments.
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*/
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const Fragments &getFragments() const;
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/*
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* Returns a string constructed from all strings in all fragments.
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*/
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std::string getString() const;
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#pragma mark - DebugStringConvertible
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SharedDebugStringConvertibleList getDebugChildren() const override;
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private:
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Fragments fragments_;
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};
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} // namespace react
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} // namespace facebook
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