void dragSource_DragStart(object sender, DragDropStartEventArgs e)
{
ArrayList draggedItems = new ArrayList();
List <IList> sourceList = new List <IList>();
SelectedRecordCollection selectedRecords = this.dataPresenter.SelectedItems.Records;
DataRecord lastSelectedDataRecord = null;
foreach (Record r in selectedRecords)
{
DataRecord dr = r as DataRecord;
if (dr != null)
{
lastSelectedDataRecord = dr;
draggedItems.Add(dr.DataItem);
sourceList.Add(GetSourceList(dr));
}
}
DraggingData data = new DraggingData();
data.Items = draggedItems;
data.Lists = sourceList;
if (lastSelectedDataRecord != null && lastSelectedDataRecord.ParentRecord != null)
{
data.SourceProperty = lastSelectedDataRecord.RecordManager.Field.Name;
}
e.Data = data;
}
private void OnRecordDragDrop(object sender, DropEventArgs dragInfo)
{
var result = VisualTreeHelper.HitTest(dragInfo.DropTarget, dragInfo.GetPosition(dragInfo.DropTarget));
var targetElement = Utilities.GetAncestorFromType(result.VisualHit, typeof(DataRecordPresenter), true) as DataRecordPresenter;
if (targetElement != null)
{
DataRecord targetRecord = targetElement.DataRecord;
IList targetList = GetSourceList(targetRecord);
object targetItem = targetRecord.DataItem;
Type targetType = targetItem.GetType();
DraggingData draggedData = dragInfo.Data as DraggingData;
if (draggedData != null)
{
IList itemsList = draggedData.Items;
object firstItem = itemsList[0];
IList <IList> listsList = draggedData.Lists;
if (!targetType.IsInstanceOfType(firstItem))
{
// the target type doesn't match the items we are dropping, get the child list from the parent if we have a property.
if (draggedData.SourceProperty != null)
{
PropertyInfo listProperty = targetType.GetProperty(draggedData.SourceProperty);
targetList = listProperty.GetValue(targetItem, null) as IList;
if (targetList != null)
{
for (int i = itemsList.Count - 1; i >= 0; i--)
{
object currentItem = itemsList[i];
int targetIndex = targetList.IndexOf(targetItem);
listsList[i].Remove(currentItem);
targetList.Add(currentItem);
}
}
}
else
{
MessageBox.Show("Can't drop here");
}
}
else
{
for (int i = itemsList.Count - 1; i >= 0; i--)
{
object currentItem = itemsList[i];
int targetIndex = targetList.IndexOf(targetItem);
listsList[i].Remove(currentItem);
targetList.Insert(targetIndex, currentItem);
}
}
}
}
}