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Chris Forman
845
How can I force the XamNumericSlider to only change the bound value in discrete steps?
posted

I've got a value that I want to change with a slider. It can vary from 1 to 100 and I'd like it to increment and decrement in steps of 0.1, but at the moment when I move the slider it changes the value in what's effectively a continuous manner.

This means that the value changes from 10 to 10.04589455 (say) which a) is meaningless for my application and b) ruins the layout of the page.

The `LargeChange` and `SmallChange` properties don't seem to affect this.

I can't round the value in the property setter as I'm binding to a property on an Entity, plus it seems to be the wrong approach for the problem.

How can I achieve this within the slider itself?

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  • 845
    Verified Answer
    Offline posted

    I got round this by adding an `IValueConverter` to the `Value` binding:

        Value="{Binding NewPageTemplate.LabelHeight, Mode=TwoWay, Converter={StaticResource LabelSizeConverter}}"

    This is defined as:

        public class LabelSizeConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return value;
        }
 
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            double size = (double)value;
 
            return Math.Round(size, 1);
        }
    }
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