static void DragStarted(UIElement uiElt)
{
try
{
_isMouseDown = false;
Mouse.Capture(uiElt);
DragSourceBase advisor = GetDragSource(uiElt as DependencyObject);
DataObject data = advisor.GetDataObject(_draggedElt);
data.SetData("OffsetPoint", _offsetPoint);
DragDropEffects supportedEffects = advisor.SupportedEffects;
// Perform DragDrop
DragDropEffects effects = System.Windows.DragDrop.DoDragDrop(_draggedElt, data, supportedEffects);
advisor.FinishDrag(_draggedElt, effects);
// Clean up
RemovePreviewAdorner();
Mouse.Capture(null);
_draggedElt = null;
}
catch (Exception ex)
{
VMuktiHelper.ExceptionHandler(ex, "DragStarted()", "Controls\\VMuktiGrid\\DragDropManager\\DragDropManager.cs");
}
}
private static void OnDragSourceChanged(DependencyObject depObj, DependencyPropertyChangedEventArgs args)
{
try
{
UIElement sourceElt = depObj as UIElement;
if (args.NewValue != null && args.OldValue == null)
{
sourceElt.PreviewMouseLeftButtonDown += new MouseButtonEventHandler(DragSource_PreviewMouseLeftButtonDown);
sourceElt.PreviewMouseMove += new MouseEventHandler(DragSource_PreviewMouseMove);
sourceElt.PreviewMouseUp += new MouseButtonEventHandler(DragSource_PreviewMouseUp);
// Set the Drag source UI
DragSourceBase advisor = args.NewValue as DragSourceBase;
advisor.SourceUI = sourceElt;
}
else if (args.NewValue == null && args.OldValue != null)
{
sourceElt.PreviewMouseLeftButtonDown -= DragSource_PreviewMouseLeftButtonDown;
sourceElt.PreviewMouseMove -= DragSource_PreviewMouseMove;
sourceElt.PreviewMouseUp -= DragSource_PreviewMouseUp;
}
}
catch (Exception ex)
{
VMuktiHelper.ExceptionHandler(ex, "OnDragSourceChanged()", "Controls\\VMuktiGrid\\DragDropManager\\DragDropManager.cs");
}
}
/* ____________________________________________________________________
* Drag Source events
* ____________________________________________________________________
*/
static void DragSource_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
try
{
// Make this the new drag source
DragSourceBase advisor = GetDragSource(sender as DependencyObject);
if (advisor.IsDraggable(e.Source as UIElement) == false)
{
return;
}
_draggedElt = e.Source as UIElement;
_dragStartPoint = e.GetPosition(GetTopContainer());
_offsetPoint = e.GetPosition(_draggedElt);
_isMouseDown = true;
}
catch (Exception ex)
{
VMuktiHelper.ExceptionHandler(ex, "DragSource_PreviewMouseLeftButtonDown()", "Controls\\VMuktiGrid\\DragDropManager\\DragDropManager.cs");
}
}
