using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace Orbit.Module.View
{
    class CustomScrollViewer : ScrollViewer
    {
        private Point _scrollMousePoint;
        private double _hOff = 1;
        private double _vOff = 1;

        protected override void OnKeyDown(KeyEventArgs e)
        {
            //Disable key presses
        }

        protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
        {
            _scrollMousePoint = e.GetPosition(this);
            _vOff = VerticalOffset;
            _hOff = HorizontalOffset;
            CaptureMouse();
        }

        protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e)
        {
            if (IsMouseCaptured)
                ReleaseMouseCapture();
        }

        protected override void OnPreviewMouseMove(MouseEventArgs e)
        {
            if (IsMouseCaptured)
            {
                base.OnPreviewMouseMove(e);
                var newOffsetY = _vOff + (_scrollMousePoint.Y - e.GetPosition(this).Y);
                var newOffsetX = _hOff + (_scrollMousePoint.X - e.GetPosition(this).X);
                ScrollToVerticalOffset(newOffsetY);
                ScrollToHorizontalOffset(newOffsetX);
            }
        }
    }
}