private void TreeViewItem_Drop(object sender, DragEventArgs e)
{
if (!e.Data.GetDataPresent(typeof(DocTopic)))
{
return;
}
DocTopic sourceTopic = (DocTopic)e.Data.GetData(typeof(DocTopic));
if (sourceTopic == null)
{
return;
}
var tvItem = WindowUtilities.FindAnchestor <TreeViewItem>((DependencyObject)e.OriginalSource);
if (tvItem == null)
{
return;
}
var targetTopic = tvItem.DataContext as DocTopic;
if (targetTopic == null)
{
return;
}
if (sourceTopic == targetTopic)
{
return;
}
if (MoveTopicCommand == null)
{
CreateMoveTopicCommand();
}
_dragContextMenu = new ContextMenu()
{
DataContext = DragMoveResult
};
var mi = new MenuItem
{
Header = "Move underneath this item",
Tag = _dragContextMenu,
Command = MoveTopicCommand,
CommandParameter = new DragMoveResult
{
SourceTopic = sourceTopic,
TargetTopic = targetTopic,
DropLocation = DropLocations.Below
}
};
_dragContextMenu.Items.Add(mi);
_dragContextMenu.Items.Add(new Separator());
_dragContextMenu.Items.Add(new MenuItem
{
Header = "Move before this item",
Tag = _dragContextMenu,
Command = MoveTopicCommand,
CommandParameter = new DragMoveResult
{
SourceTopic = sourceTopic,
TargetTopic = targetTopic,
DropLocation = DropLocations.Before
}
});
_dragContextMenu.Items.Add(new MenuItem
{
Header = "Move after this item",
Tag = _dragContextMenu,
Command = MoveTopicCommand,
CommandParameter = new DragMoveResult
{
SourceTopic = sourceTopic,
TargetTopic = targetTopic,
DropLocation = DropLocations.After
}
});
_dragContextMenu.Items.Add(new Separator());
_dragContextMenu.Items.Add(new MenuItem
{
Header = "Cancel topic move",
Tag = _dragContextMenu,
Command = MoveTopicCommand,
CommandParameter = null
});
WindowUtilities.DoEvents();
_dragContextMenu.Placement = System.Windows.Controls.Primitives.PlacementMode.Mouse;
_dragContextMenu.PlacementTarget = tvItem;
_dragContextMenu.Visibility = Visibility.Visible;
_dragContextMenu.IsOpen = true;
WindowUtilities.DoEvents();
}