Y locking ScrollView

gistfile1.txt

using System;
using Android.Content;
using Android.Runtime;
using Android.Util;
using Android.Views;
using Android.Widget;

namespace Cheesebaron.HorizontalListView
{
    public class YScrollView : ScrollView
    {
        private float _xDistance, _yDistance, _lastX, _lastY;

        protected YScrollView(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
        {
        }

        public YScrollView(Context context) : base(context)
        {
        }

        public YScrollView(Context context, IAttributeSet attrs) : base(context, attrs)
        {
        }

        public YScrollView(Context context, IAttributeSet attrs, int defStyle) : base(context, attrs, defStyle)
        {
        }

        public override bool OnInterceptTouchEvent(MotionEvent ev)
        {
            switch (ev.Action) {
                case MotionEventActions.Down:
                    _xDistance = _yDistance = 0f;
                    _lastX = ev.GetX();
                    _lastY = ev.GetY();
                    break;
                case MotionEventActions.Move:
                    var curX = ev.GetX();
                    var curY = ev.GetY();
                    _xDistance += Math.Abs(curX - _lastX);
                    _yDistance += Math.Abs(curY - _lastY);
                    _lastX = curX;
                    _lastY = curY;
                    if(_xDistance > _yDistance)
                        return false;
                    break;
            }

            return base.OnInterceptTouchEvent(ev);
        }
    }
}