mvvm wpf treeview ICollectionView

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I am working on treeview in mvvm wpf application. In this I need to do some functionality on selecting a item in the treeview(like add a new tab control corresponding to the selected item). For this I am trying to achive this using ICollectionview as below. I am able to bind the data to the treeview but noevent is getting fired on selecteing an item.
ViewModel:

 public ObservableCollection<TreeviewLeaf> TreeviewData
        {
            get { return _treeviewData; }
            set
            {
                _treeviewData = value;

            }

        }


        private ICollectionView _customerView;

        public ICollectionView Customers
        {
            get { return _customerView; }
        }

        public CustomViewViewModel()
        {

            TreeviewData = GetStorageServicesList();
            _customerView = CollectionViewSource.GetDefaultView(TreeviewData);

            object obj = Customers.CurrentItem;
            _customerView.CurrentChanged+=_customerView_CurrentChanged;
        }

View(xaml):

<TreeView x:Name="treeview1" ItemsSource="{Binding Customers}" >
            <TreeView.ItemTemplate >
                <HierarchicalDataTemplate ItemsSource="{Binding Childs}"   >
                    <TextBlock Text="{Binding Name}" />

                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>

But to set IsSynchronizedWithCurrentItem="True" I am not able to find it for Treeview.

Please reply me if anyone know how to solve this.

Thanks in advance.

Posted 19-Dec-12 0:55am

Nekka

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earloc · Answer 1 · 2012-12-19T01:24:00

TreeView does not support this kind of tracking the selected item (how should it be done whatsoever...you would have to deal with many instances of ICollectionView, as one DataItem has a collection of children, which themeself could have a collection of children, etc.).

Instead you could bind the TreeView's SelectedItem [^]or SelectedValue [^]property to a property of your ViewModel.

This way you would track the selected item regardless of the containing collection (that is: the depth in the tree). This solution is ok, if your DataItems are all of the same type and gets uglier, when you have to deal with various Types. Also, multi selection can not be accomplished using this approach.

Alternatively, introduce an IsSelected-property to your DataItem and bind the IsSelected-property of the TreeView's ItemContainer to it:

HTML

<TreeView>
     <TreeView.ItemContainerStyle>
         <Style
             TargetType="TreeViewItem">
             <Setter
                 Property="IsSelected"
                 Value="{Binding IsSelected, Mode=TwoWay}"></Setter>
         </Style>
     </TreeView.ItemContainerStyle>
 </TreeView>

with this apporach, you would have support for multiselect and changes to your data items would reflect in the UI (if the IsSelected-property makes use of INotifyPropertyChanged or is implemented as a DependencyProperty)

only getting a list of selected items is ugly, as you would have to travers the complete tree of data items and gather all that have IsSelected == true.

hope it helped