#WPF TREEVIEW STYLE EXAMPLES HOW TO#

One of the demos shows how to create a searchable TreeView, the other demonstrates how to implement lazy-loading (a.k.a. Along the way, we examine why people often have difficulty with the WPF TreeView, what a ViewModel is, and two demo applications that show how to combine a TreeView with a ViewModel. This article explores how to use the ViewModel pattern to make it easier to work with the TreeView control in WPF.

#WPF TREEVIEW STYLE EXAMPLES CODE#

Download the source code (requires Visual Studio 2008) - 28.6 KB.

SqlDataReader RdrCommon = new SqlDataReader() ĭsCommon = CDtier.ReturnDataSet('SELECT comp_name,comp_id,parent_id from COMP_MASTER') ĭ) ĭataView vwCompany = Public partial class CompanyView : Window / Interaction logic for CompanyView.xaml I found your styles (OrgChartTreeViewItemStyle.xaml) are apt for my project and trying to apply to my treeview. Thank you for writing nice articles on wpf controls. Hopefully one day there will be a way to customize the keyboard navigation of a TreeView, but until then. If you enable keyboard navigation in the demo you will find that it is very unintuitive to navigate the items. The demo project prevents the TreeView from responding to keyboard input altogether. As a result, I could not customize the keyboard navigation for the TreeView. The TreeView's SelectedItem property does not have a setter. Unfortunately there is no supported way to programmatically set the selected item in a TreeView. I serialized the default TreeViewItem control template to XAML and then modified that until I got the result I was looking for. TipĬustomizing the ControlTemplate for the TreeViewItem class was easy once I discovered a little trick.

#WPF TREEVIEW STYLE EXAMPLES FREE#

Feel free to peruse that code (and all the rest of it) in the source code download, which is available at the top of this article. I am not going to discuss the code which populates the TreeView with dummy data. Let's take a look at the XAML for a Window which contains our customized TreeView: This step is a simple matter of setting the TreeView's ItemsPanel property to a Grid whose HorizontalAlignment is set to ' Center'. Doing so will provide symmetry between the items, as seen in the screenshot above. The final step is to make the TreeView center the root item(s) horizontally. Let's take a look at an abridged version of the typed Style: That setting was also applied in the typed Style mentioned previously. In order for the child items to be displayed in a horizontal row, I set the TreeViewItem.ItemsPanel property to a StackPanel with a horizontal orientation. In addition to customizing the TreeViewItem control template, you also must modify the ItemsPanel of TreeViewItem. The ItemsPresenter is used to display it's child items. The ContentPresenter is used to display the content of the item. The TreeViewItem control template should have two things: a ContentPresenter whose Name is 'PART_Header' and an ItemsPresenter.

a Style with no Key) then it will automatically be applied to every TreeViewItem instance by default. If you wrap that template in a typed Style (i.e. The first step is to create a custom ControlTemplate for the TreeViewItem class. However, after we customize the way that TreeViewItems are rendered and how the TreeView positions its items, the same TreeView control can look like this: What you see above is certainly not a breathtaking representation of the data. If I populate a TreeView with some simple data and view it, by default it looks pretty plain. Graphical overviewīefore diving into the XAML which makes the magic happen, let's first take a look at what we are aiming to achieve. If you are interested in seeing another way that the TreeView can be customized, you might want to read Advanced Custom TreeView Layout in WPF. I also posted another article regarding layout customization for the TreeView control. It assumes that you already have knowledge of XAML, control templates, styles, triggers, hierarchical data templates, data binding, and other fundamentals of WPF. Along the way we will see how the power of templates and styles in WPF can provide incredible flexibility for customizing an application's user interface. The layout we will examine is quite similar to an 'org chart', where each level of items is displayed in a horizontal row directly beneath their respective parent. This article discusses how to customize the item layout in a WPF TreeView.

Wpf treeview style examples