How can I convert the values of three sliders into a Color?

Question

I\'m trying to create a custom user control that will allow a user to define a color in WPF. I\'ve done this before in WinForms but in WPF it seems to be not as straight for

Answer 1

First of all, I'd recommend making these changes to your ByteToColorConverter:

public class DoubleToColorConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        // Values bound to sliders are going to be doubles.
        return Color.FromScRgb((float)(double)values[0], (float)(double)values[1], (float)(double)values[2], (float)(double)values[3]);
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
    {
        Color C = (Color)value;
        return new object[] { (double)C.ScA, (double)C.ScR, (double)C.ScG, (double)C.ScB };
    }
}

I've switched from bytes to doubles, as the slider value you're trying to bind to will only return/accept doubles. The (float)(double) cast is to deal with unboxing the values in the array.

With this XAML, I was able to get a basic ARGB colour mixer working. Notice I've changed the Min/Max values on the slider, now we're not dealing with bytes anymore.

If you wanted to bind a single slider to the converter, you could update your converter to inspect the number of values in the values[] array. You could perhaps use the ConverterParameter to pass in the colour you'd like that single slider to affect ... something like this: