Drag&Drop Reorder: Disable "After" and "Inside"

[Ludwig]

Hello!

At the Reorder-Drag&Drop there are 3 options to reorder the Tasks: "Before", "Inside" and "After". Is there a possibility to disable "Inside" and "After", so the user only has the option to reorder "Before"?

 

kind regards

Ludwig

[Polya]

Hi Ludwig,

In order to disable the drop inside and after a GanttTask we should create a custom GanttDragDropBehavior and override the GetReorderDropPosition method. This method determines the drop position depending on the overlapping value, so if we only return DropRelativePosition.Before the user would not be able to drop inside or after a GanttTask:

public class CustomDragDropBehavior : GanttDragDropBehavior
{
    protected override DropRelativePosition GetReorderDropPosition(double overlappingValue)
    {
        return DropRelativePosition.Before;
    }
}

<telerik:RadGanttView x:Name="gantt" TasksSource="{Binding GanttTasks}" VisibleRange="{Binding VisibleRange}" >
    <telerik:RadGanttView.DragDropBehavior>
        <local:CustomDragDropBehavior  />
    </telerik:RadGanttView.DragDropBehavior>
    <telerik:RadGanttView.Columns>
        <!-- ... -->
    </telerik:RadGanttView.Columns>
</telerik:RadGanttView>

Hope this helps.

Regards,
Polya
Telerik by Progress

[Ludwig]

Hello Polya and thank you very much - works like charme.