SIL.FieldWorks.XWorks.DTMenuHandler.OnAddComponentToPrimary C# (CSharp) Method

		public bool OnAddComponentToPrimary(object argument)
		{
			Slice current = m_dataEntryForm.CurrentSlice;
			if (current == null || current.Object == null || current.Flid == 0)
				return true; // already handled - nothing else should be responding to this message
			int hvo = GetSelectedComponentHvo();
			if (hvo == 0)
				return true;

			var ler = current.Object as ILexEntryRef;
			var objForHvo = Cache.ServiceLocator.GetInstance<ICmObjectRepository>().GetObject(hvo);
			if (ler.PrimaryLexemesRS.Contains(objForHvo))
			{   // Remove from visibility array
				using (UndoableUnitOfWorkHelper helper = new UndoableUnitOfWorkHelper(
					Cache.ActionHandlerAccessor,
					xWorksStrings.ksUndoShowSubentryForComponent,
					xWorksStrings.ksRedoShowSubentryForComponent))
				{
					ler.PrimaryLexemesRS.Remove(objForHvo);
					helper.RollBack = false;
				}
				return true;
			}
			// Otherwise, continue and add it
			int idx = 0;
			foreach (var obj in ler.ComponentLexemesRS)
			{ // looping preserves the order of the components
				if (obj == objForHvo)
				{
					using (UndoableUnitOfWorkHelper helper = new UndoableUnitOfWorkHelper(
						Cache.ActionHandlerAccessor,
						xWorksStrings.ksUndoShowSubentryForComponent,
						xWorksStrings.ksRedoShowSubentryForComponent))
					{
						ler.PrimaryLexemesRS.Insert(idx, objForHvo);
						helper.RollBack = false;
					}
					break;
				}

				if (ler.PrimaryLexemesRS.Contains(obj))
				{
					++idx;
				}
			}
			return true;
		}