HorizontalSwipeConfirm.java

package net.osmand.plus.views.controls;

import android.view.GestureDetector;
import android.view.MotionEvent;

public class HorizontalSwipeConfirm implements GestureDetector.OnGestureListener {

	private static final int SWIPE_MIN_DISTANCE = 120;
	private static final int SWIPE_MAX_OFF_PATH = 250;
	private static final int SWIPE_THRESHOLD_VELOCITY = 200;

	private boolean rightToLeftSwipe;

	public HorizontalSwipeConfirm(boolean rightToLeftSwipe) {
		this.rightToLeftSwipe = rightToLeftSwipe;
	}

	@Override
	public boolean onDown(MotionEvent e) {
		return false;
	}

	@Override
	public void onShowPress(MotionEvent e) {
	}

	@Override
	public boolean onSingleTapUp(MotionEvent e) {
		return false;
	}

	@Override
	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
		return false;
	}

	@Override
	public void onLongPress(MotionEvent e) {
	}

	@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {

		if (e1 == null || e2 == null || Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) {
			return false;
		}
		// right to left swipe
		if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
			return rightToLeftSwipe;
		}
		// left to right swipe
		else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
			return !rightToLeftSwipe;
		}
		return false;
	}
}