/// <summary>
/// Calculates the column width required to fill the view in a GridView
/// For usage examples, see http://leghumped.com/blog/2009/03/11/wpf-gridview-column-width-calculator/
/// </summary>
public class WidthConverter : IValueConverter {
    /// <summary>
    /// Converts the specified value.
    /// </summary>
    /// <param name="value">The parent Listview.</param>
    /// <param name="type">The type.</param>
    /// <param name="parameter">
    /// If no parameter is given, the remaning with will be returned.
    /// If the parameter is an integer acts as MinimumWidth, the remaining with will be returned only if it's greater than the parameter
    /// If the parameter is anything else, it's taken to be a percentage. Eg: 0.3* = 30%, 0.15* = 15%
    /// </param>
    /// <param name="culture">The culture.</param>
    /// <returns>The width, as calculated by the parameter given</returns>
    public object Convert(object value, Type type, object parameter, CultureInfo culture) {
        if(value == null) return null;
        ListView listView = value as ListView;
        GridView grdView = listView.View as GridView;
        int minWidth = 0;
        bool widthIsPercentage = parameter != null && !int.TryParse(parameter.ToString(), out minWidth);
        if(widthIsPercentage) {
            string widthParam = parameter.ToString();
            double percentage = double.Parse(widthParam.Substring(0, widthParam.Length - 1));
            return listView.ActualWidth * percentage;
        } else {
            double total = 0;
            for(int i = 0; i < grdView.Columns.Count - 1; i++) {
                total += grdView.Columns[i].ActualWidth;
            }
            double remainingWidth = listView.ActualWidth - total;
            if(remainingWidth > minWidth) { // fill the remaining width in the ListView
                return remainingWidth;
            } else { // fill remaining space with MinWidth
                return minWidth;
            }
        }            
    }

    public object ConvertBack(object o, Type type, object parameter, CultureInfo culture) {
        throw new NotSupportedException();
    }
}