Hi guys,
today I wanna share with you a MultiSelectionTreeView control that I coded by myself a couple of day ago.
The source code can be downloaded here.
Feel free to reply at this post with any question or comments you have.

The controller provide the following functionalities:

  • three different selection modalities can be specified setting SelectionMode property. Supported Selection Modalities are: 
    • SingleSelectionOnly: same behaviors of  classic WPF TreeView,
    • MultipleSelectionOnly: every click select/unselect the clicked item, 
    • KeyboardModifiersMode: multiple select  items when CTRL key is pressed
  • retrieving selected nodes using SelectedItems property
  • data binding support, including HierarchicalDataTemplate
  • tree navigation using arrows keyboards up, down and left, right for expanding and collapsing nodes
  • helpful TreeItem nodes methods like:
    • SelectAllExpandedChildren/UnselectAllChildren,
    • GetDepth,
    • GetNextNodeAtSameLevel, GetPreviousNodeAtSameLevel
  • look and feel can be overridden

The default look and feel is shown in the picture below:

Happy Coding,
Marzio.

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Hi all,
if you come here you were problably looking for a control like the following (download source code):
The control also allow to show Column Headers. For displaying them you just need to modify the Height=“O” in XAML code.

The example combines two ideas I found into two articles:

The below class diagram shows the classes used for data binding purposed and representing displayed data:

Marzio.


Hi guys,
what I would like to share with you today is how to display data in hierarchical view in WPF via the powerful mechanism of databinding! The source code is downloadable here as well as the Artists.xml file.
The below pictures displays an XML file and the relevant representation in a WPF TreeView.

Artists.xml

The code for building an Hierarchical TreeView using WPF HierarchicalDataTemplate is copy-paste below:

    <Grid>
        <Grid.Resources>

            <!-- Data Binding to Artists.xml -->
            <XmlDataProvider x:Key="myArtistsData" Source="DataSources/Artists.xml" XPath="/Artists" />

            <!--Template for "Song" -->
            <HierarchicalDataTemplate x:Key="song_hdt">
                <TextBlock Text="{Binding XPath=@Name}" />
            </HierarchicalDataTemplate>

            <!-- Template for "Album" -->
            <HierarchicalDataTemplate x:Key="album_hdt"
                                      ItemTemplate="{StaticResource song_hdt}"
                                      ItemsSource="{Binding XPath=Songs/Song}">
                <TextBlock Text="{Binding XPath=@Name}" />
            </HierarchicalDataTemplate>

            <!-- Template for "Artist" -->
            <HierarchicalDataTemplate x:Key="artist_hdt"
                                      ItemTemplate="{StaticResource album_hdt}"
                                      ItemsSource="{Binding XPath=Albums/Album}">
                <TextBlock Text="{Binding XPath=@Name}" />
            </HierarchicalDataTemplate>

        </Grid.Resources>

        <TreeView ItemsSource="{Binding Source={StaticResource myArtistsData}, XPath=Artist}"
                  ItemTemplate="{StaticResource artist_hdt}"/>

    </Grid>

The XmlDataProvider is used as item source for the TreeView via binding. The TreeView specifies as ItemTemplate the artist_hdt which is a HierarchicalDataTemplate that is used in the following way:

  • Everything you put inside HierarchicalDataTemplate tag is used for displaying the current item
  • ItemsSource defines which data shall be displayed as child of current item
  • ItemTemplate defines the way to be used to display child data

Hope to be helpful 🙂
Cheers!