private async void RefreshListView(bool updateGroupsCounts = false)
{
if (updateGroupsCounts)
{
foreach (GroupsPageItem group in _itemsList)
{
ObservableCollection <ContactModel> groupContacts = new ObservableCollection <ContactModel>(HomePage.ContactCollection.Where(x => !string.IsNullOrEmpty(x.Group) && x.Group.Equals(group.GroupName)));
group.Count = groupContacts.Count;
}
}
// order collection items by group name
_filteredItemsList = SortGroups();
if (!string.IsNullOrWhiteSpace(mainSearchBar.Text))
{
_filteredItemsList = await Task.Factory.StartNew(() => SearchGroups(mainSearchBar.Text));
}
GroupsListView.ItemsSource = null;
GroupsListView.ItemsSource = _filteredItemsList;
ResizeGroupsGridToFit();
IEnumerable <GroupsPageItem> selectedItems = _filteredItemsList.Where(x => x.IsSelected);
if (selectedItems != null && selectedItems.Count() > 0)
{
_selectedGroupName = selectedItems.ElementAt(0).GroupName;
if (Device.IsInvokeRequired)
{
Device.BeginInvokeOnMainThread(() =>
{
GroupsListView.ScrollTo(selectedItems.ElementAt(0), ScrollToPosition.Center, true);
});
}
else
{
GroupsListView.ScrollTo(selectedItems.ElementAt(0), ScrollToPosition.Center, true);
}
}
}
