private void CopyItem(NpcTreeViewItem sourceItem, NpcTreeViewItem targetItem)
{
//Asking user wether he want to drop the dragged TreeViewItem here or not
if (MessageBox.Show("Would you like to drop " + sourceItem.Header + " into " + targetItem.Header + "", "", MessageBoxButton.YesNo) != MessageBoxResult.Yes)
{
return;
}
try
{
//adding dragged TreeViewItem in target TreeViewItem
AddChild(sourceItem, targetItem);
//finding Parent TreeViewItem of dragged TreeViewItem
var parentItem = FindVisualParent <NpcTreeViewItem>(sourceItem);
// if parent is null then remove from TreeView else remove from Parent TreeViewItem
if (parentItem == null)
{
Items.Remove(sourceItem);
}
else
{
parentItem.Items.Remove(sourceItem);
}
}
catch
{
// ignored
}
}
private NpcTreeViewItem GetItem(DirectoryInfo directory)
{
var item = new NpcTreeViewItem(directory, filter);
item.AddDummy();
item.Expanded += ItemExpanded;
return(item);
}
private static void AddChild(NpcTreeViewItem sourceItem, NpcTreeViewItem targetItem)
{
if (sourceItem == null)
{
throw new ArgumentNullException(nameof(sourceItem));
}
// add item in target TreeViewItem
if (sourceItem.Tag is FileInfo sourceFile)
{
sourceFile.MoveTo(Path.Combine(((DirectoryInfo)targetItem.Tag).FullName, sourceFile.Name));
if (!targetItem.HasDummy)
{
targetItem.Items.Add(new NpcTreeViewItem(sourceFile));
}
}
}
private void StartDrag(MouseEventArgs e)
{
draggedItem = (NpcTreeViewItem)SelectedItem;
if (draggedItem != null && !draggedItem.IsDirectoryNode)
{
var finalDropEffect = DragDrop.DoDragDrop(this, SelectedValue, DragDropEffects.Move);
//Checking target is not null and item is
if (finalDropEffect == DragDropEffects.Move && target != null)
{
// A Move drop was accepted
if (!draggedItem.Header.ToString().Equals(target.Header.ToString()))
{
CopyItem(draggedItem, target);
target = null;
draggedItem = null;
}
}
}
}
protected void OnItemDoubleClicked(NpcTreeViewItem item)
{
ItemDoubleClicked?.Invoke(this, item);
}
private static bool CheckDropTarget(NpcTreeViewItem sourceItem, NpcTreeViewItem targetItem)
{
//Check whether the target item is meeting your condition
return(targetItem.IsDirectoryNode && !sourceItem.IsDirectoryNode);
}