/// <summary>
/// Converts the color of the supplied brush changing its luminosity by the given factor.
/// </summary>
/// <param name="value">The value that is produced by the binding target.</param>
/// <param name="targetType">The type to convert to.</param>
/// <param name="parameter">The factor used to adjust the luminosity (0..1).</param>
/// <param name="culture">The culture to use in the converter (unused).</param>
/// <returns>A converted value.</returns>
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
#endif
{
if (value == null)
{
return(null);
}
if (parameter == null)
{
return(null);
}
var factor = double.Parse(parameter.ToString(), CultureInfo.InvariantCulture);
if (value is SolidColorBrush)
{
var color = ((SolidColorBrush)value).Color;
var hlsColor = HlsColor.FromRgb(color);
hlsColor.L *= factor;
return(new SolidColorBrush(hlsColor.ToRgb()));
}
else if (value is LinearGradientBrush)
{
var gradientStops = new GradientStopCollection();
foreach (var stop in ((LinearGradientBrush)value).GradientStops)
{
var hlsColor = HlsColor.FromRgb(stop.Color);
hlsColor.L *= factor;
gradientStops.Add(new GradientStop()
{
Color = hlsColor.ToRgb(), Offset = stop.Offset
});
}
var brush = new LinearGradientBrush(gradientStops, 0.0);
return(brush);
}
return(value);
}
