You can also drag and drop the items between TreeViews or to any other control, such as ListView and DataGrid. TreeView allows you to drag and drop items within the TreeView control by setting the AllowDragging property to true. Drag and drop within TreeView and between controls GitHub reference: You can view the example project in this GitHub location. Returns item height based on the content loaded. Returns specified item height for items. Private void SfTreeView_QueryNodeSize(object sender, Syncfusion.UI. e) sfTreeView.QueryNodeSize += SfTreeView_QueryNodeSize You can do this through the QueryNodeSize event and the QueryNodeSizeEventArgs.GetAutoFitNodeHeight method. You can adjust (autofit) the height of the node based on the content’s measured size to improve readability. Conditionally using the QueryNodeSize event.By default using the ItemHeight property.TreeView allows you to set the height of the node: GitHub reference: You can check out the example project in this GitHub location. } Load on demand with built-in busy animation Stop the animation after load on demand is executed If animation is not stopped, it remains after execution of load on demand.ĬurrentNode.ShowExpanderAnimation = false Expand the node after child items are added. Populating child items for the node in on-demand. MusicInfo musicInfo = currentNode.Content as MusicInfo Animation starts for expander to show progress of load on demand.Ī.BeginInvoke(DispatcherPriority.Background, Skip the repeated population of child items every time the node expands. Private void ExecuteOnDemandLoading(object obj) Var hasChildNodes = ((sender as TreeViewNode).Content as MusicInfo).HasChildNodes Private bool CanExecuteOnDemandLoading(object sender) TreeViewOnDemandCommand = new OnDemandCommand(ExecuteOnDemandLoading, CanExecuteOnDemandLoading) Private ICommand treeViewOnDemandCommand The following code shows how to load child nodes on demand when the OnDemandCommand is triggered. The following code example shows the procedure to bind the LoadOnDemandCommand property with the ViewModel’s property in XAML. You can use the LoadOnDemandCommand property to load the child nodes on demand while expanding the nodes.Īn important feature is that you can also display a busy indicator in the node by using the TreeViewNode.ShowExpanderAnimation property until the data is fetched in the command. TreeView allows you to load child nodes on request using the load-on-demand (lazy loading) feature. It helps you load the child nodes from services when the end-user expands the node. Load on-demand with built-in busy animation (lazy loading) GitHub reference: You can view the example in this GitHub location. If you are binding the ItemsSource and need to bind the CheckBox value, then you should set the ItemTemplateDataContextType to Node to bind the TreeViewNode.IsChecked property to CheckBox in ItemTemplate. You can also modify the parent node’s checked state when you check or uncheck the child nodes by setting the CheckBoxMode property to Recursive. You can load check boxes in the WPF TreeView control when you load TreeView in bound or unbound modes. Load a check box in each node to allow users to check and uncheck them. You can display the expander at either the start or end of the node by setting values to the ExpanderPosition property. You can also change the position of the expander view. You can control this behavior with the ExpandActionTrigger property. You can perform the expanding and collapsing actions by interacting with either the expander icon or the whole content view in the node. But our Syncfusion WPF TreeView provides an intuitive way to expand and collapse the nodes. The expanding and collapsing of nodes are the usual operations performed in a TreeView control. Let’s get started! Expand and collapse actions Drag and drop within and between controls.Load on demand with built-in busy animation.In this blog, we are going to look at the top 5 features available to improve your application: The WPF TreeView has all the features that an essential tree view control should have.
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