private void RemoveViewModelFromCollections(IIdentifier identifier)
{
if (!modelDictionary.ContainsKey(identifier.Id))
{
return;
}
IIdentityTreeItemViewModel <T> vm = viewModelDictionary[identifier.Id];
vm.Expanded -= OnViewModelExpanded;
vm.Selected -= OnViewModelSelected;
vm.Target.ParentChanged -= OnTreeItemParentChanged;
if (SelectedTreeItem == vm)
{
SelectedTreeItem = null;
}
modelDictionary.Remove(vm.Identifier.Id);
viewModelDictionary.Remove(vm.Identifier.Id);
allNodes.Remove(vm);
if (vm.Parent != null)
{
IIdentityTreeItemViewModel <T> parentVM = viewModelDictionary[vm.Parent.Identifier.Id];
parentVM.RemoveChild(identifier);
}
foreach (var item in vm.Target.Children)
{
RemoveViewModelFromCollections(item.Identifier);
}
}
private void OnTreeItemParentChanged(object sender, IdentityTreeItemParentChangedEventArgs <T> e)
{
IIdentityTreeItem <T> treeItem = sender as IIdentityTreeItem <T>;
IIdentityTreeItemViewModel <T> vm = viewModelDictionary[treeItem.Identifier.Id];
if (e.OldParent != null)
{
IIdentityTreeItemViewModel <T> oldParentVM = viewModelDictionary[e.OldParent.Identifier.Id];
oldParentVM.RemoveChild(vm.Identifier);
}
if (e.NewParent != null)
{
IIdentityTreeItemViewModel <T> newParentVM = viewModelDictionary[e.NewParent.Identifier.Id];
newParentVM.AddChild(vm);
}
}
