Group items counter displayed in group item

[Artem]

Hi, guys.
I am really sorry if I am asking something that is already is answered. But I swear I tried to search for it using Google and internal forum search.

Ok, I am using RadListView control in  ListViewType.IconsView view. And I am placing my items into groups and I do show groups.

It all started when I placed many items to the list. I immediately saw that the list is displayed with vast scroll and user see only the top of the list and only the first group. So I decided to collapse all groups when I load my items into list.

/// <summary>
/// Collapses all groups in channel pair list
/// </summary>
private void CollapseAllListGroups()
{
    foreach (var group in PairControlList.Groups)
        group.Expanded = false;
}

By the way, if it is not the best way to do so - you can tell me, because I was looking for some function like "Collapse all groups" and didn't find it. If I missed it - tell me, if not - it would be good to have one already implemented for RadListView control.

Oh.. back to things. My groups all appeared collapsed, and then I saw that it is hard for user to decide where to go, since some groups might be empty and some may have hundreds of items. So, what I want to do is to display the count of items in each group on the group item. (See attached picture)
I didn't found how to do such a thing. I believe that it has to be built in functionality of  group item in RadListView. Again, if I've missed it - just tell me.
And I tried to implement it, but no success...  was thinking about changing group item text on VisualItemCreating event, but at the same time I may not know the number of items that will be placed to each group... and items will be removed/added to the groups later.

Best regards

[Ivan Todorov]

Hi Artem,

Thank you for contacting us.

The proper way to achieve this functionality is to handle the VisualItemFormatting event:

void radListView1_VisualItemFormatting(object sender, ListViewVisualItemEventArgs e)
{
    BaseListViewGroupVisualItem groupItem = e.VisualItem as BaseListViewGroupVisualItem;
    if (groupItem != null)
    {
        groupItem.Text = groupItem.Data.Text + " (" + ((ListViewDataItemGroup)groupItem.Data).Items.Count + ")";
    }
}

As to collapsing all groups, you are using the correct approach. We will consider exposing CollapseAll/ExpandAll methods if more people request such.

If you have any further questions, do not hesitate to ask.

Regards,
Ivan Todorov
the Telerik team

[Artem]

Thank you very much for the working solution :)