- SET ICON IN TREEVIEW FOR USERCONTROL VISUAL STUDIO HOW TO
- SET ICON IN TREEVIEW FOR USERCONTROL VISUAL STUDIO TRIAL
When the RadTreeView's IsVirtualizing property is set to False, then all items within an expanded level are created. Now when you try to expand the first node, then only those elements that will be on the screen will be generated. You can place it in RowDefinition with Height="*" instead. For example, ScrollViewer, StackPanel and Grid with Row.Height=Auto or Column.Width=Auto will measure it in that way. When the IsVirtualizing proeprty is set to True, the ChildDefaultLength property can be set to the expected header size of the TreeViewItems if it will be different than the default MinHeight of 24 for the TreeViewItems.ĭo not place RadTreeView in controls/panels which will measure it with infinity as this will disable the UI Virtualization. In order to enable the UI Virtualization behavior, you should set the IsVirtualizing property of the RadTreeView to True. In this case you need to use the UI Virtualization behavior of the RadTreeView. Which means that when you try to expand the "Teams" node, it will take a few minutes in order the containers to be generated. By default the IsVirtualizing property is set to False. The RadTreeView is bound to a collection with 10000 Team objects. You can find RadTreeViewSampleData custom class implementation in the Binding to Object help article.Įxample 1: Bind RadTreeView to large number of items
SET ICON IN TREEVIEW FOR USERCONTROL VISUAL STUDIO HOW TO
The following tutorial shows how to bind to a collection of business objects and virtualize the items displayed in a RadTreeView element using the IsVirtualizing property.Įxample 1 demonstrates a simple RadTreeView declaration. It calculates the number of visible items and works with the ItemContainerGenerator from an ItemsControl (such as TreeView) to create UI elements only for visible items. The TreeViewPanel derives from VirtualizingPanel. The default ItemsPanel for the RadTreeView is TreeViewPanel.
Generating many UI elements when only a few elements might be on the screen can adversely affect the performance of your application. The word "virtualize" refers to a technique by which a subset of user interface (UI) elements are generated from a larger number of data items based on which items are visible on-screen. The standard layout system creates item containers and computes layout for each item associated with a list control. The RadTreeView API supports UI Virtualization, which processes only information loaded in the viewable area, which reduces the memory footprint of the application and speeds up the loading time thus enhancing additionally the UI performance.
SET ICON IN TREEVIEW FOR USERCONTROL VISUAL STUDIO TRIAL
This can be beneficial to other community members reading this thread.Download free 30-day trial UI Virtualization Please remember to click "Mark as Answer" the responses that resolved your issue, and to click "Unmark as Answer" if not. Public static extern int SetWindowTheme(IntPtr hwnd, string pszSubAppName, string pszSubIdList) SetWindowTheme(treeView1.Handle, "explorer", null) Rootnode = (string.Format("Item number ", x, y)
TreeView1.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Bottom | AnchorStyles.Right
ImageList myImageList = new = myImageList
MSDN Support, feel free to contact example, this test with 2 images (blue and pink butterfly for selected item) gives => If you have any compliments or complaints to This can be beneficial to other community members reading this thread. TreeView1.SelectedImageKey = "child node" Private void Form1_Load(object sender, EventArgs e) So set root or child node's icons via its or property. Then use TreeView.Nodes to get the specific root node with its index and you can also use to get the specific child node. And use TreeView.ImageList and TreeView.ImageKey property to set all node's icons. Firstly, you can add root node and child node manually.
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