bloxstrap/Bloxstrap/Utility/Rendering.cs

using System.Globalization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace Bloxstrap.Utility
{
    static class Rendering
    {
        public static double GetTextWidth(TextBlock textBlock)
        {
            return new FormattedText(
                textBlock.Text,
                CultureInfo.CurrentCulture,
                FlowDirection.LeftToRight,
                new Typeface(textBlock.FontFamily, textBlock.FontStyle, textBlock.FontWeight, textBlock.FontStretch),
                textBlock.FontSize,
                Brushes.Black,
                new NumberSubstitution(),
                VisualTreeHelper.GetDpi(textBlock).PixelsPerDip
            ).Width;
        }
    }
}