Mars200/FrameworkLocal/UICore/Converters/TabSizeConverter.cs

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

namespace MECF.Framework.UI.Core.Converters
{
    public class TabSizeConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter,
            System.Globalization.CultureInfo culture)
        {
            TabControl tabControl = values[0] as TabControl;
            double width = (int)(tabControl.ActualWidth / tabControl.Items.Count);
            //Subtract 1, otherwise we could overflow to two rows.
            return (width <= 1) ? 0 : (width - 3);
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter,
            System.Globalization.CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }
}