CODEWITHSUNDEEP
c#wpfxaml
Oscar
Oscar

Reputation: 1147

How to print a textBlock using conditionals in XAML?

I need to print in a textBlock repeat if a number is less than 80 and paint color red, and more or equal than 80 print successful with green color.

How can I do that in XAML?

Upvotes: 2

Views: 245

Answers (2)

brunnerh
brunnerh

Reputation: 184526

Converters.

Sadly there are no inequality-triggers or the like, so using a converter should do.

<TextBlock>
    <TextBlock.Foreground>
        <Binding Path="TestDouble">
            <Binding.Converter>
                <vc:ThresholdConverter BelowValue="{x:Static Brushes.Red}"
                                       AboveValue="{x:Static Brushes.Green}"
                                       Threshold="80" />
            </Binding.Converter>
        </Binding>
    </TextBlock.Foreground>
    <TextBlock.Text>
        <Binding Path="TestDouble">
            <Binding.Converter>
                <vc:ThresholdConverter BelowValue="Repeat"
                                       AboveValue="Successful"
                                       Threshold="80" />
            </Binding.Converter>
        </Binding>
    </TextBlock.Text>
</TextBlock>

public class ThresholdConverter : IValueConverter
{
    public double Threshold { get; set; }

    public object AboveValue { get; set; }
    public object BelowValue { get; set; }

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        double input;
        if (value is double)
        {
            input = (double)value;
        }
        else
        {
            var converter = new DoubleConverter();
            input = (double)converter.ConvertFrom(value);
        }
        return input < Threshold ? BelowValue : AboveValue;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

Upvotes: 3

Dylan Meador
Dylan Meador

Reputation: 2401

<local:NumberToBrushConverter x:Key="numberToBrushConverter" />
<local:NumberToTextConverter x:Key="numberToTextConverter" />

<TextBlock Background="{Binding Number, Converter={StaticResource numberToBrushConverter}}"                    
Text="{Binding Number, Converter={StaticResource numberToTextConverter}"/>

class NumberToBrushConverter: IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        int number = (int)value;

        return number < 80 ? Brushes.Red : Brushes.Green;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return Binding.DoNothing;
    }

    #endregion
}

The other converter would look similar to the brush converter, but return "Successful" or "Repeat".

Upvotes: 2

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