private void AssociatedObject_MouseMove(object sender, MouseEventArgs e)
{
UIElement element = sender as UIElement;
if (e.LeftButton == MouseButtonState.Released)
{
element.SetValue(StartPointProperty, null);
}
if (element.GetValue(StartPointProperty) == null)
{
return;
}
Point startPoint = (Point)element.GetValue(StartPointProperty);
Point point = e.GetPosition(element as UIElement);
if (!WPFUtility.IsDragging(startPoint, point))
{
return;
}
DraggingAdorner adorner = new DraggingAdorner(element, 0.5, point);
SetDragAdorner(element, adorner);
DataObject data = new DataObject();
//set the adorner for drop action and create the clone element.
data.SetData(typeof(DraggingAdorner), adorner);
data.SetData(typeof(UIElement), element);
ICommand dragcommand = GetDragCommand(element);
//cann't drag without command
if (dragcommand != null)
{
object parameter = GetDragCommandParameter(element); // ?? this.AssociatedObject.DataContext;
if (parameter != null)
{
data.SetData(DataFormats.Serializable, parameter);
}
if (dragcommand.CanExecute(parameter))
{
dragcommand.Execute(parameter);
DragDrop.DoDragDrop(element, data, DragDropEffects.Copy | DragDropEffects.Move);
}
}
adorner.Remove();
SetDragAdorner(element, null);
}
private void AssociatedObject_QueryContinueDrag(object sender, QueryContinueDragEventArgs e)
{
UIElement element = sender as UIElement;
DraggingAdorner adorner = GetDragAdorner(element);
Point point = WPFUtility.GetMousePosition(element);
if (adorner != null)
{
adorner.Position = point;
}
}
public static void SetDragAdorner(DependencyObject obj, DraggingAdorner value)
{
obj.SetValue(DragAdornerProperty, value);
}
