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/*
* Copyright 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//--------------------------------------------------------------------------------
// gestureDetector.h
//--------------------------------------------------------------------------------
#ifndef GESTUREDETECTOR_H_
#define GESTUREDETECTOR_H_
#include <vector>
#include <android/sensor.h>
#include <android/log.h>
#include <android_native_app_glue.h>
#include <android/native_window_jni.h>
#include "JNIHelper.h"
#include "vecmath.h"
namespace ndk_helper
{
//--------------------------------------------------------------------------------
// Constants
//--------------------------------------------------------------------------------
const int32_t DOUBLE_TAP_TIMEOUT = 300 * 1000000;
const int32_t TAP_TIMEOUT = 180 * 1000000;
const int32_t DOUBLE_TAP_SLOP = 100;
const int32_t TOUCH_SLOP = 8;
enum
{
GESTURE_STATE_NONE = 0,
GESTURE_STATE_START = 1,
GESTURE_STATE_MOVE = 2,
GESTURE_STATE_END = 4,
GESTURE_STATE_ACTION = (GESTURE_STATE_START | GESTURE_STATE_END),
};
typedef int32_t GESTURE_STATE;
/******************************************************************
* Base class of Gesture Detectors
* GestureDetectors handles input events and detect gestures
* Note that different detectors may detect gestures with an event at
* same time. The caller needs to manage gesture priority accordingly
*
*/
class GestureDetector
{
protected:
float dp_factor_;
public:
GestureDetector();
virtual ~GestureDetector()
{
}
virtual void SetConfiguration( AConfiguration* config );
virtual GESTURE_STATE Detect( const AInputEvent* motion_event ) = 0;
};
/******************************************************************
* Tap gesture detector
* Returns GESTURE_STATE_ACTION when a tap gesture is detected
*
*/
class TapDetector: public GestureDetector
{
private:
int32_t down_pointer_id_;
float down_x_;
float down_y_;
public:
TapDetector()
{
}
virtual ~TapDetector()
{
}
virtual GESTURE_STATE Detect( const AInputEvent* motion_event );
};
/******************************************************************
* Pinch gesture detector
* Returns GESTURE_STATE_ACTION when a double-tap gesture is detected
*
*/
class DoubletapDetector: public GestureDetector
{
private:
TapDetector tap_detector_;
int64_t last_tap_time_;
float last_tap_x_;
float last_tap_y_;
public:
DoubletapDetector()
{
}
virtual ~DoubletapDetector()
{
}
virtual GESTURE_STATE Detect( const AInputEvent* motion_event );
virtual void SetConfiguration( AConfiguration* config );
};
/******************************************************************
* Double gesture detector
* Returns pinch gesture state when a pinch gesture is detected
* The class handles multiple touches more than 2
* When the finger 1,2,3 are tapped and then finger 1 is released,
* the detector start new pinch gesture with finger 2 & 3.
*/
class PinchDetector: public GestureDetector
{
private:
int32_t FindIndex( const AInputEvent* event, int32_t id );
const AInputEvent* event_;
std::vector<int32_t> vec_pointers_;
public:
PinchDetector()
{
}
virtual ~PinchDetector()
{
}
virtual GESTURE_STATE Detect( const AInputEvent* event );
bool GetPointers( Vec2& v1, Vec2& v2 );
};
/******************************************************************
* Drag gesture detector
* Returns drag gesture state when a drag-tap gesture is detected
*
*/
class DragDetector: public GestureDetector
{
private:
int32_t FindIndex( const AInputEvent* event, int32_t id );
const AInputEvent* event_;
std::vector<int32_t> vec_pointers_;
public:
DragDetector()
{
}
virtual ~DragDetector()
{
}
virtual GESTURE_STATE Detect( const AInputEvent* event );
bool GetPointer( Vec2& v );
};
} //namespace ndkHelper
#endif /* GESTUREDETECTOR_H_ */
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