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Xaml
<syncfusion:SfListView AllowGroupExpandCollapse="True"
ItemsSource="{Binding contactsinfo}">
<syncfusion:SfListView.GroupHeaderTemplate>
<DataTemplate>
<Grid >
<Grid.ColumnDefinitions>
<Image Source="{Binding IsExpand, Converter={StaticResource BoolToImageConverter}}"/>
</StackLayout>
</Grid>
</DataTemplate>
</syncfusion:SfListView.GroupHeaderTemplate>
</syncfusion:SfListView>
Converter
public class BoolToImageConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if ((bool)value)
{
return ImageSource.FromResource("SfListViewSample.Images.GroupExpand.png");
}
else
{
return ImageSource.FromResource("SfListViewSample.Images.GroupCollapse.png");
}
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
} |
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Xaml
<syncfusion:SfListView AllowGroupExpandCollapse="True" ItemsSource="{Binding contactsinfo}">
<syncfusion:SfListView.GroupHeaderTemplate>
<DataTemplate>
<Grid BackgroundColor="#E4E4E4">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<StackLayout Orientation="Horizontal" HorizontalOptions="Start" VerticalOptions="Center" Padding="10,0,0,0">
<Label Text="{Binding Key}" TextColor="Black" FontSize="Medium"/>
</StackLayout>
<StackLayout Orientation="Horizontal" Grid.Column="1" Padding="0,0,20,0"
HorizontalOptions="EndAndExpand" VerticalOptions="Center">
<Label Text="{Binding Count}" TextColor="Black" FontSize="Medium"/>
<Label Text="Item(s)" TextColor="Black" FontSize="Medium"/>
<Image Source="{Binding Items, Converter={StaticResource BoolToImageConverter}}" HeightRequest="50" WidthRequest="100"/>
</StackLayout>
</Grid>
</DataTemplate>
</syncfusion:SfListView.GroupHeaderTemplate>
</syncfusion:SfListView>
Converter
public class BoolToImageConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var image = ImageSource.FromResource("SfListViewSample.Images.GroupExpand.png");
var items = value as IEnumerable;
if (items != null)
{
var groupitems = items.ToList<object>().ToList<object>();
if (groupitems != null)
{
for (int i = 0; i < groupitems.Count; i++)
{
var contact = groupitems[i] as Contacts;
if (contact.ContactName == "Kenny")
image = ImageSource.FromResource("SfListViewSample.Images.new.jpg");
}
}
}
return image;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
} |
