/// <inheritdoc />
public virtual void StartDrag(IDragInfo dragInfo)
{
var items = TypeUtilities.CreateDynamicallyTypedList(dragInfo.SourceItems).Cast <object>().ToList();
if (items.Count > 1)
{
dragInfo.Data = items;
}
else
{
// special case: if the single item is an enumerable then we can not drop it as single item
var singleItem = items.FirstOrDefault();
if (singleItem is IEnumerable && !(singleItem is string))
{
dragInfo.Data = items;
}
else
{
dragInfo.Data = singleItem;
}
}
dragInfo.Effects = dragInfo.Data != null
? DragDropEffects.Copy | DragDropEffects.Move | DragDropEffects.Link
: DragDropEffects.None;
}
/// <summary>
/// Queries whether a drag can be started.
/// </summary>
/// <param name="dragInfo">Information about the drag.</param>
/// <remarks>
/// To allow a drag to be started, the <see cref="DragInfo.Effects" /> property on <paramref name="dragInfo" />
/// should be set to a value other than <see cref="DragDropEffects.None" />.
/// </remarks>
public virtual void StartDrag(IDragInfo dragInfo)
{
var itemCount = dragInfo.SourceItems.Cast <object>().Count();
if (itemCount == 1)
{
dragInfo.Data = dragInfo.SourceItems.Cast <object>().First();
}
else if (itemCount > 1)
{
dragInfo.Data = TypeUtilities.CreateDynamicallyTypedList(dragInfo.SourceItems);
}
dragInfo.Effects = (dragInfo.Data != null) ? DragDropEffects.Copy | DragDropEffects.Move : DragDropEffects.None;
}
/// <inheritdoc />
public void StartDrag(IDragInfo dragInfo)
{
//In our case, the Treeview does not support multiple items, so the drag behavior can't figure it out
//So we will take care of it ourselves.
var itemCount = dragInfo.SourceItems.Cast <object>().Count();
if (itemCount == 1 && SelectedItems.Count == 1)
{
dragInfo.Data = TypeUtilities.CreateDynamicallyTypedList(new[] { dragInfo.SourceItems.Cast <object>().First() });
}
else if (itemCount == 1 && SelectedItems.Count == 0)
{
var dragItem = dragInfo.SourceItems.Cast <object>().First() as ElementModelViewModel;
if (dragItem != null)
{
dragInfo.Data = TypeUtilities.CreateDynamicallyTypedList(new[] { dragItem });
dragItem.IsSelected = true;
}
}
else if (itemCount > 1)
{
dragInfo.Data = TypeUtilities.CreateDynamicallyTypedList(dragInfo.SourceItems);
}
else if (SelectedItems.Count > 1 && itemCount == 1)
{
if (SelectedItems.Contains(dragInfo.SourceItems.Cast <object>().First()))
{
dragInfo.Data = TypeUtilities.CreateDynamicallyTypedList(SelectedItems);
}
else
{
var dragItem = dragInfo.SourceItems.Cast <object>().First() as ElementModelViewModel;
if (dragItem != null)
{
dragInfo.Data = TypeUtilities.CreateDynamicallyTypedList(new[] { dragItem });
foreach (var elementModelViewModel in SelectedItems.ToList())
{
elementModelViewModel.IsSelected = false;
}
dragItem.IsSelected = true;
}
}
}
dragInfo.Effects = (dragInfo.Data != null) ? DragDropEffects.Copy | DragDropEffects.Move : DragDropEffects.None;
}
public static void StartDragWith(this IDragInfo dragInfo, IEnumerable <object> objects)
{
var itemCount = objects.Count();
if (itemCount == 1)
{
dragInfo.Data = objects.First();
}
else if (itemCount > 1)
{
dragInfo.Data = TypeUtilities.CreateDynamicallyTypedList(objects);
}
dragInfo.Effects = (dragInfo.Data != null) ?
DragDropEffects.Copy | DragDropEffects.Move :
DragDropEffects.None;
}
public void StartDrag(AyDragInfo dragInfo)
{
int itemCount = dragInfo.SourceItems.Cast <object>().Count();
if (itemCount == 1)
{
dragInfo.Data = dragInfo.SourceItems.Cast <object>().First();
}
else if (itemCount > 1)
{
dragInfo.Data = TypeUtilities.CreateDynamicallyTypedList(dragInfo.SourceItems);
}
dragInfo.Effects = (dragInfo.Data != null) ?
DragDropEffects.Copy | DragDropEffects.Move :
DragDropEffects.None;
if (handler22 == null)
{
handler22 = new GiveFeedbackEventHandler(DragSource_GiveFeedback);
}
dragInfo.VisualSource.GiveFeedback += handler22;
}