Binding ListBox ItemCount to IvalueConverter
- by Ben
Hi All,
I am fairly new to WPF so forgive me if I am missing something obvious. I'm having a problem where I have a collection of AggregatedLabels and I am trying to bind the ItemCount of each AggregatedLabel to the FontSize in my DataTemplate so that if the ItemCount of an AggregatedLabel is large then a larger fontSize will be displayed in my listBox etc. The part that I am struggling with is the binding to the ValueConverter. Can anyone assist? Many thanks!
XAML Snippet
<DataTemplate x:Key="TagsTemplate">
<WrapPanel>
<TextBlock Text="{Binding Name, Mode=Default}"
TextWrapping="Wrap"
FontSize="{Binding ItemCount, Converter={StaticResource CountToFontSizeConverter}, Mode=Default}"
Foreground="#FF0D0AF7"/>
</WrapPanel>
</DataTemplate>
<ListBox x:Name="tagsList"
ItemsSource="{Binding AggregatedLabels, Mode=Default}"
ItemTemplate="{StaticResource TagsTemplate}"
Style="{StaticResource tagsStyle}"
Margin="200,10,16.171,11.88" />
AggregatedLabel Collection
using (DB2DataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
AggregatedLabelModel aggLabel = new AggregatedLabelModel();
aggLabel.ID = Convert.ToInt32(dr["LABEL_ID"]);
aggLabel.Name = dr["LABEL_NAME"].ToString();
LabelData.Add(aggLabel);
}
}
Converter
public class CountToFontSizeConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
const int minFontSize = 6;
const int maxFontSize = 38;
const int increment = 3;
int count = (int)value;
if ((minFontSize + count + increment) < maxFontSize)
{
return minFontSize + count + increment;
}
return maxFontSize;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
#endregion
}
AggregatedLabel Class
public class AggregatedLabelModel
{
public int ID { get; set; }
public string Name { get; set; }
}
CollectionView
ListCollectionView labelsView = new ListCollectionView(LabelData);
labelsView.GroupDescriptions.Add(new PropertyGroupDescription("Name"));
