![wpf treeview with checkboxes example wpf treeview with checkboxes example](https://i.stack.imgur.com/iJkWB.png)
© 2009-2023 Rocky Mountain Computer Consulting, Inc. At that point there is no more recursion and control unwinds back up the call stack.ĭownload the example to experiment with it and to see additional details. It will give you a knowledge to create simple Tree, customization, Template and Binding. The event handler calls itself recursively until the event handler reaches a node with no children. This article describes the use of TreeView control provided by WPF. When the program changes a child node's Checked state, that node raises an AfterCheck event so the event handler executes for that node, too, and it sets the Checked property for the child's children. It then loops over the node's child nodes and sets all of their Checked properties to match. This code gets the node that was checked or unchecked and saves its Checked state in the variable is_checked to make the code easier to read. Private void trvMeals_AfterCheck(object sender, TreeViewEventArgs e) Check or uncheck all nodes in this node's subtree. This doesn't match the way the checkboxes work but it's the behavior of the control so I'm not going to try to fight it.) (This event fires whenever a checkbox's value changes, except it only fires once if you double-click a node. When the user checks or unchecks a node, the following AfterCheck event handler executes. Deselecting Dessert also deselected all of the items in its TreeView subtree. I then deselected the Wine and Dessert items. Then the user can deselect individual nodes within the subtree if desired.įor example, in the picture shown here I checked the Dinner box and the program checked all of the items in the Dinner TreeView subtree. Sometimes it's useful to let the user select a TreeView subtree by clicking on a higher-level node. (action, DispatcherPriority.C# Helper: Check a TreeView subtree in C# Var uncheckedItem = checkBoxTreeViewItem.Header Void checkBoxTreeViewItem_Unchecked(object sender, RoutedEventArgs e) (action, DispatcherPriority.ContextIdle) Var checkedItem = checkBoxTreeViewItem.Header Void checkBoxTreeViewItem_Checked(object sender, RoutedEventArgs e)ĬheckBoxTreeViewItem checkBoxTreeViewItem = sender as CheckBoxTreeViewItem Protected override DependencyObject GetContainerForItemOverride()ĬheckBoxTreeViewItem checkBoxTreeViewItem = new CheckBoxTreeViewItem() NewContainer.Unchecked += Unchecked_EventHandler NewContainer.Checked += Checked_EventHandler NewContainer.Unchecked -= Unchecked_EventHandler NewContainer.Checked -= Checked_EventHandler Internal void OnNewContainer(CheckBoxTreeViewItem newContainer) Type listType = typeof(ObservableCollection).MakeGenericType(type.GetGenericArguments()) ĬheckedItems = (IList)Activator.CreateInstance(listType) Void ItemsSourceChanged(object sender, EventArgs e) Unchecked_EventHandler = new RoutedEventHandler(checkBoxTreeViewItem_Unchecked) ĭependencyPropertyDescriptor.FromProperty(CheckBoxTreeView.ItemsSourceProperty, typeof(CheckBoxTreeView)) ĭpd.AddValueChanged(this, ItemsSourceChanged) Private RoutedEventHandler Unchecked_EventHandler Ĭhecked_EventHandler = new RoutedEventHandler(checkBoxTreeViewItem_Checked) Private RoutedEventHandler Checked_EventHandler Public static DependencyProperty CheckedItemsProperty =ĭependencyProperty.Register("CheckedItems", Then the ItemContainerStyle can be used like this ĬheckBoxTreeView.cs namespace CheckBoxTreeViewLibrary What should happen is that certain directories show a color (this works) and certain directories are checked if they are found in a XML file. When the user expands a node, an event calls folderExpanded adding the subdirectories of that node. To add two-way binding for the IsChecked property, the CheckBoxTreeViewItemStyle.xaml ResourceDictionary must be merged. In a WPF window I show a treeview with checkboxes with disks/directories on a Pc. The Control can be used just like a regular TreeView. If a CheckBoxTreeViewItem hasn't been generated yet (not expanded to) then the source for it won't be in the CheckedItems collection until it has been generated.CheckedItems supports two-way Binding to source.
![wpf treeview with checkboxes example wpf treeview with checkboxes example](https://i.stack.imgur.com/d26rq.png)
CheckedItems is an ObservableCollection where T is the interal type of ItemsSource.The CheckBoxTreeViewLibrary source can be downloaded here Finally got around to update the CheckBoxTreeView with the missing features.