public VerifyExpressionView()
{
InitializeComponent();
FieldGallery.ItemsSource = _items;
_rootTreeViewItem = TreeViewItemInfo.CreateNew("All Fields");
DataContextChanged += OnDataContextChanged;
}
public void AddSubItem(TreeViewItemInfo item)
{
if (_items.FirstOrDefault(x => x.Id == item.Id) == null)
{
_items.Add(item);
}
}
private async void ShowSubItemsOfTheNode(TreeViewItemInfo parentNode)
{
//This complex logic here is for the animation's sake.
var itemsPresent = _items;
var itemsToShow = new ObservableCollection<IFieldViewModel>();
var nodesToShow = parentNode.GetAllLevelSubItems();
if (nodesToShow.Any())
{
itemsToShow.AddRange(
nodesToShow.Select(n =>
_sourceFieldViewModels.First(vm => vm.Field.Id == n.Id)));
itemsToShow =
new ObservableCollection<IFieldViewModel>(itemsToShow.OrderBy(x => x.Field.Name));
}
else
{
_items.Clear();
return;
}
var itemsToPreserve = itemsPresent.Intersect(itemsToShow).ToList();
var itemsToAdd = itemsToShow.Except(itemsToPreserve).ToList();
var itemsToRemove = itemsPresent.Except(itemsToPreserve).ToList();
if (itemsToRemove.Any())
{
await RemoveItemsAsync(itemsToRemove, itemsPresent);
}
if (itemsToAdd.Any())
{
await AddItemsAsync(itemsPresent, itemsToAdd);
}
if (itemsToPreserve.Any())
{
foreach (var itemNode in itemsToPreserve)
{
var pos = itemsToShow.IndexOf(itemNode);
itemsPresent.Remove(itemNode);
itemsPresent.Insert(pos, itemNode);
}
}
}
private void OnWindowClosed(object sender, EventArgs args)
{
var vm = sender as VerifyExpressionViewModel;
if (vm == null)
return;
if (_previewPanel != null)
{
var behaviorCollection = Interaction.GetBehaviors(_previewPanel);
var moveBehavior =
behaviorCollection.FirstOrDefault(x => x is FluidMoveBehavior) as FluidMoveBehavior;
if (moveBehavior != null)
{
moveBehavior.IsActive = false;
moveBehavior.Detach();
behaviorCollection.Remove(moveBehavior);
}
foreach (var child in _previewPanel.Children)
{
var cp = child as ContentPresenter;
if (cp != null)
{
cp.Content = null;
cp.ContentTemplate = null;
cp.DataContext = null;
}
}
_previewPanel.Children.Clear();
_previewPanel = null;
}
_items.Clear();
_treeViewItems.Clear();
_sourceFieldViewModels.Clear();
_rootTreeViewItem.ClearSubItems();
_rootTreeViewItem = null;
ExpressionTestFields.Clear();
DataContext = null;
DataContextChanged -= OnDataContextChanged;
vm.PropertyChanged -= OnDataContextPropertyChanged;
vm.Closed -= OnWindowClosed;
}