/// <summary>
/// Checks if an existing identifier at the focus can be split in two.
/// </summary>
/// <param name="inner">Inner to use to split the identifier upon return.</param>
/// <param name="replaceIndex">Index of the identifier to replace upon return.</param>
/// <param name="insertIndex">Index of the identifier to insert upon return.</param>
/// <returns>True if an identifier can be split at the focus.</returns>
public virtual bool IsIdentifierSplittable(out IFocusListInner inner, out IFocusInsertionListNodeIndex replaceIndex, out IFocusInsertionListNodeIndex insertIndex)
{
inner = null;
replaceIndex = null;
insertIndex = null;
bool IsSplittable = false;
IFocusNodeState IdentifierState = Focus.CellView.StateView.State;
if (IdentifierState.Node is Identifier AsIdentifier)
{
IFocusNodeState ParentState = IdentifierState.ParentState;
if (ParentState.Node is QualifiedName)
{
string Text = AsIdentifier.Text;
Debug.Assert(CaretPosition >= 0 && CaretPosition <= Text.Length);
inner = IdentifierState.ParentInner as IFocusListInner;
Debug.Assert(inner != null);
IFocusBrowsingListNodeIndex CurrentIndex = IdentifierState.ParentIndex as IFocusBrowsingListNodeIndex;
Debug.Assert(CurrentIndex != null);
Identifier FirstPart = NodeHelper.CreateSimpleIdentifier(Text.Substring(0, CaretPosition));
Identifier SecondPart = NodeHelper.CreateSimpleIdentifier(Text.Substring(CaretPosition));
replaceIndex = CurrentIndex.ToInsertionIndex(ParentState.Node, FirstPart) as IFocusInsertionListNodeIndex;
Debug.Assert(replaceIndex != null);
insertIndex = CurrentIndex.ToInsertionIndex(ParentState.Node, SecondPart) as IFocusInsertionListNodeIndex;
Debug.Assert(insertIndex != null);
insertIndex.MoveUp();
IsSplittable = true;
}
}
return(IsSplittable);
}
