private void SwagItemsControl_Add(object sender, RoutedEventArgs e)
{
FrameworkElement fe = (FrameworkElement)e.OriginalSource;
ICollection <SwagOption> col = (ICollection <SwagOption>)fe.DataContext;
SwagOption opt = null;
String tag = (fe.Tag ?? "").ToString();
switch (tag)
{
case "GROUP":
opt = new SwagOptionGroup();
break;
case "STRING":
opt = new StringOption();
break;
case "DATE":
opt = new DateOption();
break;
case "BOOL":
opt = new BooleanOption();
break;
}
col.Add(opt);
CollectionViewSource.GetDefaultView(col).Refresh();
}
private void SwagItemsControl_TreeViewItemDrop(object sender, RoutedEventArgs e)
{
TreeViewItemDropEventArgs tviea = (TreeViewItemDropEventArgs)e;
tviea.TargetItem.BorderThickness = new Thickness(0, 0, 0, 0);
if (!CheckIfValidDrop(tviea)) //Drops are still possible because TreeViewItemDropPreview can be skipped
{
return;
}
MoveType moveType = GetMoveType(tviea);
SwagOption targetOpt = (SwagOption)tviea.TargetItem.DataContext;
SwagOption droppedOpt = (SwagOption)tviea.DroppedItem.DataContext;
SwagOptionGroup originalDroppedParent = (SwagOptionGroup)droppedOpt.Parent;
Boolean sameParent = originalDroppedParent == targetOpt.Parent;
Int32 originalDroppedSequence = droppedOpt.Sequence,
currentDroppedSequence = droppedOpt.Sequence,
targetSequence = targetOpt.Sequence,
delta = targetSequence - originalDroppedSequence;
switch (moveType)
{
case MoveType.Above:
case MoveType.Below:
if (!sameParent)
{
originalDroppedParent.Children.Remove(droppedOpt);
droppedOpt.Sequence = -1; //reset sequence
targetOpt.Parent.Children.Add(droppedOpt);
currentDroppedSequence = droppedOpt.Sequence;
delta = targetSequence - currentDroppedSequence;
}
switch (moveType)
{
case MoveType.Above:
if (delta != 0)
{
foreach (SwagOption sibling in targetOpt.Parent.Children)
{
if (sibling.Sequence >= Math.Min(currentDroppedSequence, targetSequence) && sibling.Sequence < Math.Max(currentDroppedSequence, targetSequence))
{
sibling.Sequence = (sibling.Sequence + (delta > 0 ? -1 : 1));
}
}
droppedOpt.Sequence = targetSequence + (delta > 0 ? -1 : 0);
if (targetOpt.Parent == null)
{
CollectionViewSource.GetDefaultView(OptionCollection).Refresh();
}
else
{
CollectionViewSource.GetDefaultView(targetOpt.Parent.Children).Refresh();
}
}
break;
case MoveType.Below:
if (delta != 0)
{
foreach (SwagOption sibling in targetOpt.Parent.Children)
{
if (sibling.Sequence > Math.Min(currentDroppedSequence, targetSequence) && sibling.Sequence <= Math.Max(currentDroppedSequence, targetSequence))
{
sibling.Sequence = (sibling.Sequence + (delta > 0 ? -1 : 1));
}
}
droppedOpt.Sequence = targetSequence + (delta > 0 ? 0 : 1);
if (targetOpt.Parent == null)
{
CollectionViewSource.GetDefaultView(OptionCollection).Refresh();
}
else
{
CollectionViewSource.GetDefaultView(targetOpt.Parent.Children).Refresh();
}
}
break;
}
break;
case MoveType.Into:
if (tviea.TargetItem.DataContext is SwagOptionGroup grp)
{
originalDroppedParent.Children.Remove(droppedOpt);
droppedOpt.Sequence = -1; //reset sequence
grp.Children.Add(droppedOpt);
}
break;
}
}