private void TreeViewExplorer_Drop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(ClipboardBufferData)))
{
ClipboardBufferData data = e.Data.GetData(typeof(ClipboardBufferData)) as ClipboardBufferData;
Point currentPosition = e.GetPosition(TreeViewExplorer);
TreeViewItem item = TreeViewExtensions.GetNearestContainer(e.OriginalSource as UIElement);
//Можно ли вставить данные сюда?
if (item == null)
{
return;
}
var elem = item.Tag as ProjectElementBase;
if (elem == null)
{
return;
}
if (elem is IDropable)
{
(elem as IDropable).Drop(data);
}
}
}
private void TreeViewExplorer_DragOver(object sender, DragEventArgs e)
{
try
{
Point currentPosition = e.GetPosition(TreeViewExplorer);
if ((Math.Abs(currentPosition.X - startPoint.X) > SystemParameters.MinimumHorizontalDragDistance) ||
(Math.Abs(currentPosition.Y - startPoint.Y) > SystemParameters.MinimumVerticalDragDistance))
{
// Verify that this is a valid drop and then store the drop target
TreeViewItem item = TreeViewExtensions.GetNearestContainer(e.OriginalSource as UIElement);
//Можно ли вставить данные сюда?
var elem = item.Tag as ProjectElementBase;
ClipboardBufferData data = e.Data.GetData(typeof(ClipboardBufferData)) as ClipboardBufferData;
e.Effects = ((elem is IDropable) && ((elem as IDropable).CanDrop(data))) ? DragDropEffects.Move : DragDropEffects.None;
e.Handled = true;
return;
}
e.Effects = DragDropEffects.None;
e.Handled = true;
return;
}
catch (Exception)
{
}
}
private void TreeViewExplorer_MouseMove(object sender, MouseEventArgs e)
{
TreeViewItem item = TreeViewExtensions.GetNearestContainer(e.OriginalSource as UIElement);
if ((e.LeftButton == MouseButtonState.Pressed) && (item != null))
{
var mousePos = e.GetPosition(null);
var diff = startPoint - mousePos;
if (Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance)
{
if (selectedItems.Count != 0)
{
List <ProjectElementBase> elements = new List <ProjectElementBase>();
foreach (TreeViewItem i in selectedItems)
{
if (i != null)
{
ProjectElementBase elem = i.Tag as ProjectElementBase;
elements.Add(elem);
}
}
if (ClipboardBufferData.CheckGroupValid(elements) != GroupType.IllegalGroup)
{
var dragData = new DataObject(new ClipboardBufferData(ClipboardOperationType.Cut, elements));
DragDrop.DoDragDrop(TreeViewExplorer, dragData, DragDropEffects.Move | DragDropEffects.None);
}
}
}
}
}
