WPF binding Width to Parent.Width*0.3

Question

I want to bind a control\'s Width to the parent\'s Width, but to a certain scale. Is there a way to do something like this:

Answer 1

Sure, but you will need to use a converter. Something like this one:

using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Markup;

namespace WpfTestBench.Converters
{
    public class PercentageConverter : MarkupExtension, IValueConverter
    {
        private static PercentageConverter _instance;

        #region IValueConverter Members

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return System.Convert.ToDouble(value) * System.Convert.ToDouble(parameter);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return _instance ?? (_instance = new PercentageConverter());
        }
    }
}

And your XAML will look like: