Telerik blogs

Tsvyatko Konov

Tsvyatko Konov was the Lead of UI for Xamarin and UI for UWP team.

  • Web

    Creating custom drag arrow in Silverlight

    Since Q3 2011 we have changed the default drag API used. It allows creating more complex scenario as well as building MVVM friendly drag behaviors. However, it does not support drag arrow which, although not very popular feature is still used. Thus, when arrow was required, we have suggesting using legacy execution mechanism. In this blog I will write how to create your own drag arrow using DragDropManager events. So, basically we will use AddDragInitialize, GiveFeedback and DragDropCompleted to create and control the arrow. We also use Popup to display it on the screen. The arrow itself is located in Arrow...
    by Tsvyatko Konov
    January 23, 2012
  • Desktop WPF

    Using commands with RadDragAndDropManager for WPF and Silverlight

        In this post I will demonstrate how to extend the Drag Drop functionality of the RadDragAndDropManager adding command support by using the attached behaviors extensibility. That way one can easily move the logic for the operation from the code behind into your model and work only with the Data object. To demonstrate the idea I will use scenario where items are being dragged between ListBoxes.   The behavior transforms the Drag Drop events into commands. It exposes the following properties: - DragCommand – executed when dragInfo event is raised. - DropCommand – executed when dropInfo event is raised. - DragCueTemplate – data template that defines the dragcue...
    by Tsvyatko Konov
    December 15, 2010
  • Desktop WPF

    Drag from external programs into you WPF applications using RadDragAndDropManager

    Since Q3 2010 we have introduced new drag mode, enabling native drag from and to your WPF applications. In this post I will show how to successfully perform drag drop operations from external program into your application through the RadDragAndDropManager API. This can be achieved in several easy steps:   1. Set RadDragAndDropManager.EnableNativeDrag=”true”. This will enable native operations (if your application runs in full trust). The easiest way to do this is set it in StartUp event.           private void Application_Startup(object sender, StartupEventArgs e)         {             RadDragAndDropManager.EnableNativeDrag = true;         }   2. Set the RadDragAndDropManager properties to enable the drop operation:   telerik:RadDragAndDropManager.AllowDrop="True" telerik:RadDragAndDropManager.DropQuery="FileListGrid_DropQuery" telerik:RadDragAndDropManager.DropInfo="FileListGrid_DropInfo"   and add the corresponding...
    by Tsvyatko Konov
    December 08, 2010
  • Web

    Enable RadGridView’s rows reorder functionality using Behaviors

    Using RadControls can boost the development process, using bunch of built-in features. However, sometimes we encountered scenarios where we need something very specific. In addition, we do want to make our custom logic encapsulated and easy reusable.  So,when this is the case,using behaviors is our best choice. In this blog I will show small example how to use the behavior power to enable row reorder functionality.     In order to enable drag and drop functionality, it simply uses our RadDragAndDropManager, giving us simple solution for the drag/drop functionality. So in order to use it and customize it we can even go the...
    by Tsvyatko Konov
    May 20, 2010
  • Desktop WPF

    Command Row for RadGridView with CRUD operations

    In my first blog post I will GridView extension that many people requested similar to ASP.NET UI experience – executing CRUD operations using buttons to execute. Bellow I will show one option to achieve this easily using the implementation of the Command pattern and attached behaviors approach available in Silverlight and WPF. Short overview of the command pattern Command pattern encapsulates a request as an object and gives it a known public interface. Using this pattern ensures that every object receives its own commands and provides a decoupling between sender and receiver. A sender is an object that invokes an operation (usually...
    by Tsvyatko Konov
    March 24, 2010
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