using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;
using System.Windows.Input;

namespace Tango.Editors
{
    internal class CustomScrollViewer : ScrollViewer
    {
        public event EventHandler<MouseWheelEventArgs> MouseZooming;

        protected override void OnMouseWheel(MouseWheelEventArgs e)
        {
            if (Keyboard.IsKeyDown(Key.LeftCtrl))
            {
                e.Handled = true;
                OnMouseZooming(e);
            }
            else
            {
                base.OnMouseWheel(e);
            }
        }

        protected override void OnKeyDown(KeyEventArgs e)
        {
            if (e.KeyboardDevice.Modifiers == ModifierKeys.Control)
            {
                if (e.Key == Key.Left || e.Key == Key.Right)
                    e.Handled = true;
                    return;
            }
            base.OnKeyDown(e);
        }

        protected override void OnPreviewKeyDown(KeyEventArgs e)
        {
            if (e.Key == Key.Up || e.Key == Key.Down || e.Key == Key.Right || e.Key == Key.Left)
            {
                e.Handled = true;
            }
        }

        protected virtual void OnMouseZooming(MouseWheelEventArgs e)
        {
            if (MouseZooming != null) MouseZooming(this, e);
        }
    }
}