123 строки
3.0 KiB
C++
123 строки
3.0 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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#pragma once
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#include <react/core/EventEmitter.h>
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#include <react/core/LayoutMetrics.h>
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#include <react/core/ReactPrimitives.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()(const Touch &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()(const Touch &lhs, const Touch &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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/*
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* Defines the `touchstart`, `touchend`, `touchmove`, and `touchcancel` event
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* types.
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*/
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struct TouchEvent {
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/*
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* A list of Touches for every point of contact currently touching the
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* surface.
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*/
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Touches touches;
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/*
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* A list of Touches for every point of contact which contributed to the
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* event.
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*/
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Touches changedTouches;
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/*
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* A list of Touches for every point of contact that is touching the surface
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* and started on the element that is the target of the current event.
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*/
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Touches targetTouches;
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};
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class TouchEventEmitter;
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using SharedTouchEventEmitter = std::shared_ptr<const TouchEventEmitter>;
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class TouchEventEmitter : public EventEmitter {
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public:
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using EventEmitter::EventEmitter;
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void onTouchStart(const TouchEvent &event) const;
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void onTouchMove(const TouchEvent &event) const;
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void onTouchEnd(const TouchEvent &event) const;
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void onTouchCancel(const TouchEvent &event) const;
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private:
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void dispatchTouchEvent(
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const std::string &type,
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const TouchEvent &event,
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const EventPriority &priority) const;
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};
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} // namespace react
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} // namespace facebook
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