![]() ![]() It’s very simple, and you need to implement only two methods. IEnumerable GetChildren(TreePath treePath) The model is described by ITreeModelInterface: The view asks the model for details, if needed, and displays the changes. If the model changes, it notifies the view by firing corresponding events. The main idea of this pattern is to split the model (business object) from its visualization (control). I really like the Model-View pattern, and decided to use it in this control. The following screenshots illustrate the TreeViewAdv features: NET code - No WinAPI is used in this control. Drag & Drop highlighting - Dynamically highlight the drop position.Load on Demand - Lazy load of child nodes.Multicolumns - You can split the TreeView into several columns.Unlimited number of controls for each node - You can display three icons + a CheckBox + two Labels.Multiselection - Maybe the first limitation which you will find in the standard TreeView is that it’s not possible to select more then one node.Model-View architecture - Will be covered in a separate section of this article. ![]() These are the key features of the TreeViewAdv control: The architecture of this control comes mainly from the Java Swing component, with some modifications. I could not find an alternative TreeView control which is free and fully meets my needs, so finally I decided to write my own. But learning this control to do something more complex is not an easy job. It works pretty well if you only need basic features. Of course, the first thing you will do is to use the standard. Working on several different projects, I was needed to display and edit hierarchical data. ![]()
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