CODEWITHSUNDEEP
wpfxamlconverters
Sonhja
Sonhja

Reputation: 8448

Change border color depending on boolean value

I have a border wihch I want to change its color depending on a boolean variable. I used the link here to implement a Boolean to Color converter.

The code looks like this:

The xaml:

<Border Width="45" 
     Height="45" CornerRadius="5" 
     Background="{Binding Path=LivenessActive, Converter={StaticResource BrushColorConverter}}" />

The LivenessActive variable in background:

public bool LivenessActive
{
  get { return _livenessActive; }
  set
  {
      _livenessActive = value;
      OnPropertyChanged("LivenessActive");
  }
}

Where the class has an inheritance to the INotifyPropertyChanged and has implemented the OnPropertyChanged event.

The BrushColorConverter.cs:

public class BrushColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if ((bool)value)
        {
            {
                return new SolidColorBrush(Colors.GreenYellow);
            }
        }
        return new SolidColorBrush(Colors.DarkGray);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }

}

But I can't fire even the BrushColorConverter. What I'm doing wrong?

2nd: What about if I want to use it from an another Window?

<Border Width="45" Height="45" CornerRadius="5" 
     Background="{Binding Path=LivenessActive, Converter={StaticResource BrushColorConverter}, 
                RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type view:MyWindowName}}}" />

I used this same code and it's not finding it.

Upvotes: 3

Views: 5542

Answers (1)

dkozl
dkozl

Reputation: 33364

To sum up comments since there seems to be nothing wrong with code above it would suggest there is a problem with binding context for 

Background="{Binding Path=LivenessActive, Converter={StaticResource BrushColorConverter}}"

You cannot reference one Window from another Window. If you have 2 independent Windows each with Border that should trigger on the same property change then you set DataContext of both windows to same instance of view model.

Upvotes: 4

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