private void UpdateTimeGroups()
{
TimeGroupViewModels.CollectionChanged -= OnTimeGroupsCollectionChanged;
TimeGroupViewModels.Clear();
groupsDictionary.Clear();
itemGroupDictionary.Clear();
var entriesWithGroups = EntryViewModels.Select(x => new
{
TimeGroup = GetTimeGroupForItem(x),
EntryVm = x
}).ToList();
var groupedItems = entriesWithGroups.GroupBy(i => i.TimeGroup).OrderByDescending(g => g.Key.OrderIndex).ToList();
foreach (var group in groupedItems)
{
var groupName = @group.Key.GroupName;
var groupVm = new EntryListItemTimeGroupViewModel(groupName);
var sortedItems = @group.OrderByDescending(i => i.EntryVm.DateAdded).Select(x => x.EntryVm);
groupVm.Items = new ObservableCollection<EntryListItemViewModel>(sortedItems);
TimeGroupViewModels.Add(groupVm);
foreach (var entry in groupVm.Items)
{
itemGroupDictionary.Add(entry, groupVm);
}
groupsDictionary.Add(groupName, groupVm);
}
TimeGroupViewModels.CollectionChanged += OnTimeGroupsCollectionChanged;
}
private void AddEntryToGroup(EntryListItemViewModel viewModel)
{
var group = GetTimeGroupForItem(viewModel);
EntryListItemTimeGroupViewModel groupViewModel;
if (!groupsDictionary.TryGetValue(group.GroupName, out groupViewModel))
{
groupViewModel = new EntryListItemTimeGroupViewModel(group.GroupName);
groupViewModel.Items = new ObservableCollection<EntryListItemViewModel>();
TimeGroupViewModels.Insert(0, groupViewModel);
groupsDictionary.Add(group.GroupName, groupViewModel);
}
groupViewModel.Items.Insert(0, viewModel);
if (!itemGroupDictionary.ContainsKey(viewModel))
{
itemGroupDictionary.Add(viewModel, groupViewModel);
}
}
