Raise DropCompleted / DragCompleted

[GoogleCodeExporter]

Is it possible to implement raise events DropCompleted and DragCompleted?
In the args info about the source, target and data, or just DropInfo.

Thanks,

Frank

Original issue reported on code.google.com by sportfr...@gmail.com on 6 May 2010 at 1:07

[GoogleCodeExporter]

Is this related to Issue #4: Move only?

Where should DropCompleted and DragCompleted be raised? On the drag source or 
the drop 
target?

My proposed fix to issue #4 is to add a DragCompleted method to the IDragSource 
interface which accepts a DropInfo. Would this suffice? What would 
DropCompleted add 
that isn't already present?

Original comment by gro...@gmail.com on 11 May 2010 at 11:22

[GoogleCodeExporter]

No, this has nothing to do with #4.

I want to call a method after a drag is completed in the main application 
itself, and
not in a seperate class.

Normally a drop/drop event fires a DragDrop event at the end, see
http://msdn.microsoft.com/en-us/library/aa289508%28VS.71%29.aspx. But your 
component
doesn’t. 

This is a hint of what I’m thinking of. Not tested, but copied from something 
else I
created, I think you should change the treeview in a DependencyObject.

public static readonly RoutedEvent DragCompletedEvent = 
EventManager.RegisterRoutedEvent(
            "DragCompleted",
            RoutingStrategy.Bubble,
            typeof(RoutedEventHandler),
            typeof(TreeViewExtensions)
        );
private static void RaiseDragCompleted(System.Windows.Controls.TreeView tree)
        {           
            if (DragCompletedEvent != null)
                tree.RaiseEvent(new RoutedEventArgs(DragCompletedEvent, null));
        }

And called in: 
static void DropTarget_PreviewDrop(object sender, DragEventArgs e)
{
….
RaiseDragCompleted(tree);
e.Handled = true;
}

Original comment by sportfr...@gmail.com on 12 May 2010 at 4:26

[GoogleCodeExporter]

Hi Steven,

I don't know if you have implemented this already.

I have a LINQ datasource as ItemsSource and converted as List (not an 
ObservableCollection). After a drop the items are not refreshed. Could you 
please add the following lines to DragDrop.cs? It will add a new event 
DropCompleted that will be fired after the drop is completed.

1. Just before "public static class DragDrop":
   public delegate void DragCompletedEventHandler(object sender, DragCompletedEventArgs e);

2. At the end, as a new class:
public class DragCompletedEventArgs : RoutedEventArgs
    {
        public DragCompletedEventArgs(DragInfo dragInfo)
        {
            this.draginfo = dragInfo;
        }
        public readonly DragInfo draginfo;
    }

3. After "public static readonly DependencyProperty IsDropTargetProperty =":
public static readonly RoutedEvent DragCompletedEvent = 
EventManager.RegisterRoutedEvent(
            "DragCompleted",
            RoutingStrategy.Bubble,
            typeof(DragCompletedEventHandler),
            typeof(DragDrop)
        );

        // Provide CLR accessors for the event
        public static void AddDragCompletedHandler(DependencyObject dependencyObject, DragCompletedEventHandler handler)
        {
            UIElement element = dependencyObject as UIElement;
            if (element != null)
            {
                element.AddHandler(DragCompletedEvent, handler);
            }
        }

        public static void RemoveDragCompletedHandler(DependencyObject dependencyObject, DragCompletedEventHandler handler)
        {
            UIElement element = dependencyObject as UIElement;
            if (element != null)
            {
                element.RemoveHandler(DragCompletedEvent, handler);
            }
        }

4. At the end of "static void DropTarget_PreviewDrop(object sender, 
DragEventArgs e)", just before "e.Handled = true;":
if (DragCompletedEvent != null)
                {
                    DragCompletedEventArgs dragCompletedArgs = new DragCompletedEventArgs(m_DragInfo);
                    dragCompletedArgs.RoutedEvent = DragCompletedEvent;
                    m_DragInfo.VisualSource.RaiseEvent(dragCompletedArgs);
                }

In my application I then have the following:
 private void datagrid_DragCompleted(object sender, DragCompletedEventArgs e)
        {
            datagrid.Items.Refresh();
        }

Once again thank you for this nice component,

Frank               

Original comment by sportfr...@gmail.com on 8 Mar 2011 at 1:36