protected override void OnExecute(object parameter)
{
if (!(parameter is IDataObject dataObject))
{
return;
}
IToolboxItem item;
if (dataObject.GetFormats().Any(x => x == DataFormats.Text))
{
item = ToolboxItem.CreateTextItem(new ToolboxItemData(DataFormats.Text, dataObject.GetData(DataFormats.Text)));
}
else if (dataObject.GetDataPresent(ToolboxItemDataFormats.DataSource))
{
try
{
var dataSource = dataObject.GetData(ToolboxItemDataFormats.DataSource) as ToolboxItemDefinitionBase;
item = new ToolboxItem(dataSource);
}
catch (ExternalException)
{
return;
}
}
else
{
return;
}
if (_toolbox.SelectedNode is IToolboxItem selectedItem)
{
var category = selectedItem.Parent;
var index = category.Items.IndexOf(selectedItem);
category.Items.Insert(index + 1, item);
}
else if (_toolbox.SelectedNode is IToolboxCategory selectedCategory)
{
selectedCategory.Items.Insert(0, item);
}
}
public void DragOver(IDropInfo dropInfo)
{
dropInfo.DropTargetAdorner = null;
var stringFlag = false;
if (IsTextObjectInDragSource(dropInfo, out var dataObject))
{
dropInfo.Effects = DragDropEffects.Copy | DragDropEffects.Move;
dropInfo.DropTargetAdorner = typeof(ToolboxInsertAdorner);
var format = dataObject.GetFormats().First();
dropInfo.Data = ToolboxItem.CreateTextItem(new ToolboxItemData(format, dataObject.GetData(format)));
stringFlag = true;
}
if (dropInfo.IsSameDragDropContextAsSource && !stringFlag)
{
//Restore original data
dropInfo.Data = dropInfo.DragInfo.SourceItem;
}
DragDrop.DragDrop.DefaultDropHandler.DragOver(dropInfo);
if (!CanDropToolboxItem(dropInfo, dropInfo.Data as IToolboxNode))
{
dropInfo.Effects = DragDropEffects.None;
}
if (dropInfo.IsSameDragDropContextAsSource)
{
if (dropInfo.DragInfo != null && dropInfo.TargetItem == dropInfo.DragInfo.SourceItem)
{
dropInfo.Effects = DragDropEffects.None;
}
else
{
if (!stringFlag && Equals(dropInfo.TargetCollection, dropInfo.DragInfo.SourceCollection))
{
var targetSource = dropInfo.TargetCollection.Cast <object>().ToList();
var indexTarget = targetSource.IndexOf(dropInfo.TargetItem);
var indexSource = targetSource.IndexOf(dropInfo.DragInfo.SourceItem);
if (indexTarget == -1)
{
if (indexSource == dropInfo.InsertIndex - 1 && (dropInfo.InsertPosition & RelativeInsertPosition.TargetItemCenter) == 0)
{
dropInfo.Effects = DragDropEffects.None;
}
}
if (indexSource == indexTarget + 1 && dropInfo.InsertPosition == RelativeInsertPosition.AfterTargetItem && (dropInfo.InsertPosition & RelativeInsertPosition.TargetItemCenter) == 0)
{
dropInfo.Effects = DragDropEffects.None;
}
if (indexSource == indexTarget - 1 && dropInfo.InsertPosition == RelativeInsertPosition.BeforeTargetItem)
{
dropInfo.Effects = DragDropEffects.None;
}
}
}
}
if (dropInfo.InsertPosition.HasFlag(RelativeInsertPosition.TargetItemCenter))
{
dropInfo.DropTargetAdorner = null;
}
else
{
dropInfo.DropTargetAdorner = dropInfo.Effects == DragDropEffects.None ? null : typeof(ToolboxInsertAdorner);
}
}