90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
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/*
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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/core/ReactPrimitives.h>
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#include <react/debug/DebugStringConvertible.h>
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#include <react/graphics/Geometry.h>
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namespace facebook {
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namespace react {
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/*
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* Describes an individual touch point for a touch event.
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* See https://www.w3.org/TR/touch-events/ for more details.
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*/
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struct Touch {
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/*
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* The coordinate of point relative to the root component in points.
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*/
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Point pagePoint;
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/*
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* The coordinate of point relative to the target component in points.
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*/
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Point offsetPoint;
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/*
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* The coordinate of point relative to the screen component in points.
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*/
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Point screenPoint;
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/*
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* An identification number for each touch point.
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*/
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int identifier;
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/*
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* The tag of a component on which the touch point started when it was first
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* placed on the surface, even if the touch point has since moved outside the
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* interactive area of that element.
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*/
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Tag target;
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/*
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* The force of the touch.
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*/
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Float force;
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/*
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* The time in seconds when the touch occurred or when it was last mutated.
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*/
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Float timestamp;
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/*
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* The particular implementation of `Hasher` and (especially) `Comparator`
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* make sense only when `Touch` object is used as a *key* in indexed
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* collections. Because of that they are expressed as separate classes.
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*/
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struct Hasher {
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size_t operator()(Touch const &touch) const {
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return std::hash<decltype(touch.identifier)>()(touch.identifier);
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}
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};
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struct Comparator {
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bool operator()(Touch const &lhs, Touch const &rhs) const {
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return lhs.identifier == rhs.identifier;
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}
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};
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};
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using Touches = std::unordered_set<Touch, Touch::Hasher, Touch::Comparator>;
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#if RN_DEBUG_STRING_CONVERTIBLE
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std::string getDebugName(Touch const &touch);
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std::vector<DebugStringConvertibleObject> getDebugProps(
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Touch const &object,
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DebugStringConvertibleOptions options);
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#endif
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} // namespace react
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} // namespace facebook
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