Wpf treeview with checkboxes example
This is why if your applicaiton implements an MVVM approach and the RadTreeView is databound, it's best to define custom 'tri-state' logic in your ViewModels following this tutorial.įor more information, read the topic about CheckBox Support. Please keep in mind that the RadTreeView 'tri-state' check boxes logic is desined to work in declaratively populated RadTreeView control. In this mode the item will be checked only if all of its child items are checked too. When this mode is activated the CheckState property of each item is depending on the CheckState property of its child items.
If the check boxes need to have "tri-states" set the IsTriStateMode property of the RadTreeView to True. This state is available only when the RadTreeView IsTriStateMode property is set to True. Indeterminate - the Item has items that are checked and items that are not checked.The CheckState property is a ToggleState enumeration and has the following values: To see the Item check state use the CheckState property of the RadTreeViewItem class.
These events are available both on the RadTreeView and on the RadTreeViewItem classes. To handle the change of the item check state use the PreviewChecked, Checked, PreviewUnchecked and Unchecked events. Enable this behavior by setting the IsOptionElementsEnabled property of the RadTreeView to True. RadTreeView provides check boxes displayed next to each item. This tutorial demonstrates how to take advantage of the built-in CheckBox support in the RadTreeViewItems. Once again the solution is data binding, which we'll look into in the next chapters.Download free 30-day trial Add Check Boxes (Radio Buttons) Next to Each Item Situations, and while you could do it from Code-behind instead, this would have resulted in even more lines of code. While it is entirely possible to define an entire TreeView just using markup, as we did in the above examples, it's not the best approach in most Because we're defining the entire thing with simple markup, you can do almost anything, but as you can see from the example code, it doesĬome with a price: Huge amounts of XAML code, for a tree with just six nodes in total! Summary I did a whole bunch of things here, just to show you the kind of flexibility you get: I colored the child items and I added images and even buttons to the
You're rewarded with a lot more flexibility than you could ever get from the WinForms TreeView. With the WPF TreeView, it's a bit more complex, but This is very easy to do with WinForms, because the TreeView is built exactly for this scenario. One of the common requests from people coming from WinForms or even other UI libraries is the ability to show an image next to the text label of a TreeView We have covered the key concepts and provided detailed context on the topic. Shows us that we can stuff pretty much whatever we want to into the Header property instead of just a string and then have the TreeView render it - a greatĮxample of why it's so easy to customize the look of WPF controls. In this article, we have discussed a comprehensive example of implementing a tree view with parent-child checkbox selection in WPF using the MVVM pattern. As you can see, I can just specify a text string and then have it rendered directly withoutĭoing anything else, but this is WPF being nice to us - internally, it wraps the text inside of a TextBlock control, instead of forcing you to do it. The Header is an interesting property, though. TreeViewItem's with images and other controls By default, a TreeViewItem is not expanded, but to show you the structure of the example, I have used the IsExpanded property to expand the two parent items. To specify the text we want displayed for each node, we use the Header property. The TreeView control and its child objects are also child tags to its parent object. We simply declare the TreeViewItem objects directly in the XAML, in the same structure that we want to display them in, where the first tag is a child of This is indeed very easy to get started with, as you can see from the example here: The TreeView control: A simple TreeView exampleĪs we talked about in the previous article, the WPF TreeView can be used in a very simple manner, by adding TreeViewItem objects to it, either fromĬode-behind or simply by declaring them directly in your XAML.