//
#endregion
#region Drag Source Events
// DragSource
private void DragSource_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
this._sourceItemsControl = (ItemsControl)sender;
var visual = e.OriginalSource as Visual;
this._sourceDataContext = (sender as DataGrid).DataContext;
this._targetDataContext = null;
this._mappedValueCollection = AttachedColumnBehavior.GetMappedValues(sender as DependencyObject);
this._topWindow = Window.GetWindow(this._sourceItemsControl);
this._initialMousePosition = e.GetPosition(this._topWindow);
this._sourceItemContainer = _sourceItemsControl.ContainerFromElement(visual) as FrameworkElement;
_columnsModel = GetColumnModel(sender, e, out _sourceCell);
if (_columnsModel == null)
{
return;
}
if (this._sourceItemContainer != null)
{
_rowModel = this._sourceItemContainer.DataContext;
this._draggedData = AttachedColumnBehavior.GetMappedValues(sender as DependencyObject).ReturnIfExistAddIfNot(_columnsModel, _rowModel);
}
}
private void DragSource_SelectedCellsChanged(object sender, SelectedCellsChangedEventArgs e)
{
IList <DataGridCellInfo> selectedCells = (sender as DataGrid).SelectedCells;
this._multipleDraggedData.Clear();
selectedCells.ToList().ForEach(x =>
{
RowViewModel rowModel = x.Item as RowViewModel;
ColumnsViewModel columnModel = x.Column.Header as ColumnsViewModel;
MappedValue value = AttachedColumnBehavior.GetMappedValues(sender as DependencyObject).ReturnIfExistAddIfNot(columnModel, rowModel);
var selectedCell = rowModel.Name + columnModel.Currency;
if (value.Value != null && selectedCells.Count > 1 && !_multipleDraggedData.ContainsKey(selectedCell))
{
this._multipleDraggedData.Add(selectedCell, value);
}
});
_isMultipleCells = selectedCells.Count > 1;
}
private void DropTarget_PreviewDrop(object sender, DragEventArgs e)
{
object draggedItem = e.Data.GetData(this._format.Name);
int indexRemoved = -1;
if (draggedItem != null)
{
if ((e.Effects & DragDropEffects.Move) != 0 && (this._sourceItemsControl == this._targetItemsControl || GetIsDropRejectFromOthers(this._targetItemsControl)))
{
this._targetDataContext = (sender as DataGrid).DataContext;
// Remove the selected Cell here from Mapped Values
DataGrid dgc = sender as DataGrid;
RowViewModel sourceRowHeader = ((RowViewModel)(dgc.CurrentItem));
ColumnsViewModel sourceColumnHeader = ((ColumnsViewModel)((dgc.CurrentColumn).Header));
string srcCell = sourceRowHeader.Name + sourceColumnHeader.Currency;
MappedValueCollection sourceCell = AttachedColumnBehavior.GetMappedValues(sender as DependencyObject);
MappedValue mappedValue = sourceCell.ReturnIfExistAddIfNot(sourceColumnHeader, sourceRowHeader);
int getIndex = sourceCell.IndexOf(mappedValue);
//var hitTestInfo = (sender as DataGrid).InputHitTest(new Point{ X = e.})
sourceCell[getIndex].Value = (draggedItem as MappedValue).Value;
//indexRemoved = RemoveItemFromItemsControl(this._sourceItemsControl, draggedItem);
}
// This happens when we drag an item to a later position within the same ItemsControl.
if (indexRemoved != -1 && this._sourceItemsControl == this._targetItemsControl && indexRemoved < this._insertionIndex)
{
this._insertionIndex--;
}
if (!GetIsDropRejectFromOthers(this._targetItemsControl))
{
IEnumerable itemsSource = _targetItemsControl.ItemsSource;
Type type = itemsSource.GetType();
Type genericIListType = type.GetInterface("IList`1");
int elementsCount = 0;
if (genericIListType != null)
{
elementsCount = (int)type.GetProperty("Count").GetValue(itemsSource, null);
}
if (elementsCount > this._insertionIndex)
{
RemoveItemFromItemsControlByIndex(this._targetItemsControl, this._insertionIndex);
InsertItemInItemsControl(this._targetItemsControl, draggedItem, this._insertionIndex);
if (this._sourceItemsControl == this._targetItemsControl)
{
Type draggedType = draggedItem.GetType();
object newitem = Activator.CreateInstance(draggedType);
InsertItemInItemsControl(this._sourceItemsControl, newitem, indexRemoved);
}
}
}
else
{
Type draggedType = draggedItem.GetType();
object newitem = Activator.CreateInstance(draggedType);
//InsertItemInItemsControl(this._sourceItemsControl, newitem, indexRemoved);
}
RemoveDraggedAdorner();
RemoveInsertionAdorner();
}
e.Handled = true;
}