GT2/Ejectable/node_modules/react-native/ReactCommon/fabric/components/view/Touch.h

90 lines
2.1 KiB
C++

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