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GitHub Repository: hrydgard/ppsspp
 Path: blob/master/Common/Input/GestureDetector.h
Views: 1401
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#pragma once

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#include <cstdint>

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#include "Common/Input/InputState.h"

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#include "Common/Math/geom2d.h"

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// Mainly for detecting (multi-)touch gestures but also useable for left button mouse dragging etc.

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// Currently only supports simple scroll-drags with inertia.

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// TODO: Two-finger zoom/rotate etc.

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enum Gesture {

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	GESTURE_DRAG_VERTICAL = 1,

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	GESTURE_DRAG_HORIZONTAL = 2,

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	GESTURE_TWO_FINGER_ZOOM = 4,

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	GESTURE_TWO_FINGER_ZOOM_ROTATE = 8,

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};

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// May track multiple gestures at the same time. You simply call GetGestureInfo

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// with the gesture you are interested in.

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class GestureDetector {

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public:

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	GestureDetector();

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	TouchInput Update(const TouchInput &touch, const Bounds &bounds);

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	void UpdateFrame();

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	bool IsGestureActive(Gesture gesture, int touchId) const;

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	bool GetGestureInfo(Gesture gesture, int touchId, float info[4]) const;

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private:

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	enum Locals {

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		MAX_PTRS = 10,

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	};

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	struct Pointer {

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		bool down;

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		double downTime;

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		float lastX;

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		float lastY;

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		float downX;

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		float downY;

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		float deltaX;

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		float deltaY;

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		float distanceX;

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		float distanceY;

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		float estimatedInertiaX;

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		float estimatedInertiaY;

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		uint32_t active;

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	};

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	Pointer pointers[MAX_PTRS]{};

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};

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