3/30/2024 0 Comments Wpf treeview mvvm exampleThe path to a node in the RadTreeView control consists of the path from the root to the last child in the hierarchy of the node. The path to that item in fact is "1\1.191". In your case "1.191" represents the value of the Path property of the item but does not represent the path to that item. When working with the BringIntoView support of the RadTreeView, it is important to prove the path to an item. In fact when i run through the treeview with the ExpandToPendingSelection method, the new item is prepared (ItemPrepared) before i reach it, i don't know if it's the reason of my problem to select the item. The Item2 is expanded (like expected Line 107 FolderWrapper), but the new item is not selected. Launch the application, open the "Item 1", right click on "Item 2" and select Add menu. Add a new item : To do that i used this Blog. In fact, i don't expected that it can do well the job, because I don't want raise a loadondemand on each Item to find the correct node. However if you expand the "Item 1", the item 1.191 exists. BringPathIntoView : If you launch the application, set the path to 1.191 (textbox Under the bringpathintoview button) and click on Bringpathintoview button nothing happend. The objective is to able to add a new item Inside an existing item, bring it to the view, select it and edit it. A wrapper (FolderWrapper) is used for bindings between the model and the view. The list of item is provided by a service class (DriveService), for this project the items are built statically (but in reality the item will be loaded from database). The project show a treeview with the LoadOnDemand enabled. You can found an application sample here Link Actually, you can achieve your requirements by implementing the LoadOnDemand feature and your custom commands into the demonstrating project. Furthermore, at the end of the article you can find a link leading to a blog post with additional information about the usage of the method and a runnable project, demonstrating the described approach. You can find an article, explaining how you can implement it here. This is why we recommend using the BringPathIntoView() method. Regarding your last question, it seems that the BringIndexIntoView() method can not visualize hierarchical data. You can do this be subscribing to the ItemsPrepared event of the RadTreeView control. In order to do this you will have to make sure that the corresponding RadTreeViewItem is visualized and then set it in edit mode. Maybe you expect that the focus should be in the TextBox since the item is in edit mode. Hence, it is expected that the corresponding RadTreeViewItem is focused. Regarding your second question, you focus the selected container in your code. You can also bind in TwoWay mode the IsSelected property of the RadTreeViewItems (using a Style) to property defined in your View-Model. One possible approach is to use commands in combination with bindings (which you have implemented). Furthermore, you want to bring into the view port, add and edit items at run-time. Now we can focus, select, edit the item:ģ- When I add a new folder in a not expanded folder near the windows bottom and if the childs node fill the window the item is not bring into view.Īs far as I understand you want to use the LoadOnDemand feature of the RadTreeView control. Var treeViewItem = treeView.SelectedContainer The item is not selected and the focus is always on treeview.ĮxpandToPendingSelection(path.ToString().Split('.')) But I don't found the way to set the item in editmode (even if i use a edittemplate). I use the ExpandToPendingSelection sample (wpf treeview documentation) to select and bring the item into the view. If the folder is not empty, the folder is expanded and the node is showįolderWrapper newFolder = new FolderWrapper(new Folder() ) Ģ- Like i want a couple less between my viewmodel and view, i use a event to fire the new folder into my view. If the folder is empty when added the new folder the node is not show If (!this.Expanded) this.Expanded = true Expanded = true fire the loadondemand if needed and open the treenode When i set the Expanded property to true in my viewmodel the loadondemand is well fired but when just after i add the new folder in my observablecollection, for empty folder the new folder is not shown (it's like the node is not expanded) and for folder with childs the new folder is well shown. The sample load the folder on C drive for loadondemand but NOTHING is implemented when add/rename action are called (only UI).ġ- I have a different behavior between empty/not empty folder. (.NET 4.5 with Telererik Controls Q2 2013). I have a WPF project with a RadTreeView with loadondemand enabled and i want to be able to add/edit/delete item by a RadControlMenu in a mvvm context.
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