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<chart:DoughnutSeries x:Name="series" EnableTooltip="True" . . .>
<chart:DoughnutSeries.TooltipTemplate>
<DataTemplate >
<StackLayout Orientation="Vertical" VerticalOptions="FillAndExpand" Spacing="0" Padding="3" Margin="0">
<Label Text="{Binding Value}" VerticalTextAlignment="Center" HorizontalOptions="StartAndExpand" TextColor="Black" FontAttributes="Bold" FontFamily="Helvetica" FontSize="12" />
<Label Text="{Binding Value, Converter={StaticResource LabelConverter}, ConverterParameter={x:Reference series}}" VerticalTextAlignment="Center" HorizontalOptions="EndAndExpand" TextColor="Black" FontAttributes="None" FontFamily="Helvetica" Margin="0" FontSize="10" />
</StackLayout>
</DataTemplate>
</chart:DoughnutSeries.TooltipTemplate> </chart:DoughnutSeries> |
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public class LabelConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if(value != null)
{
if(parameter !=null)
{
var data = (double)value;
var series = parameter as DoughnutSeries;
if(series != null)
{
var datasource = series.BindingContext as DoughnutSeriesViewModel;
var percentage = (data / datasource.Total) * 100;
return "(" + percentage + " %" + ")";
}
}
}
return value;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return value;
}
}
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