Imports System.ComponentModel
Imports System.Collections.ObjectModel
Imports EgtUILib
Imports EgtWPFLib5

Public Class MachiningParameterExpanderVM
   Inherits VMBase

   Private WithEvents m_CurrOperation As MachiningTreeViewItem
   Public Property CurrOperation As MachiningTreeViewItem
      Get
         Return m_CurrOperation
      End Get
      Set(value As MachiningTreeViewItem)
         m_CurrOperation = value
      End Set
   End Property

   Private m_CurrOperation_IsModified As Boolean
   Public Property CurrOperation_IsModified As Boolean
      Get
         Return m_CurrOperation_IsModified
      End Get
      Set(value As Boolean)
         m_CurrOperation_IsModified = value
      End Set
   End Property

   Private m_CurrOperation_ErrorOnOperation As Boolean
   Public Property CurrOperation_ErrorOnOperation As Boolean
      Get
         Return m_CurrOperation_ErrorOnOperation
      End Get
      Set(value As Boolean)
         m_CurrOperation_ErrorOnOperation = value
      End Set
   End Property

   Private m_UpdateMachiningBtn_Background As SolidColorBrush = Brushes.LightGray
   Public ReadOnly Property UpdateMachiningBtn_Background As SolidColorBrush
      Get
         If m_CurrOperation_ErrorOnOperation Then
            Return Brushes.Red
         ElseIf m_CurrOperation_IsModified Then
            Return Brushes.Gold
         Else
            Return Brushes.LightGray
         End If
      End Get
   End Property

   Private m_bPreviewTool As Boolean = False
   Private m_nPtEntId As Integer = GDB_ID.NULL
   Public Property ViewTool As Boolean
      Get
         Return m_bPreviewTool
      End Get
      Set(value As Boolean)
         If value Then
            EgtPreparePreviewMachiningTool()
            m_nPtEntId = EgtPreviewMachiningTool(GDB_ID.NULL, MCH_PTM.AFTER)
            m_bPreviewTool = True
         Else
            EgtRemovePreviewMachiningTool()
            m_bPreviewTool = False
         End If
         EgtDraw()
         NotifyPropertyChanged("ViewTool")
      End Set
   End Property

   Dim WoodDrillParamExpanderV As WoodDrillingParameterExpanderV
   Dim WoodSawParamExpanderV As WoodSawingParameterExpanderV
   Dim WoodMillParamExpanderV As WoodMillingParameterExpanderV
   Dim BeamMillParamExpanderV As BeamMillingParameterExpanderV
   Dim PocketParamExpanderV As PocketingParameterExpanderV
   Dim MortiseParamExpanderV As MortisingParameterExpanderV
   Dim GenMachinParamExpanderV As GenMachiningParameterExpanderV
   Dim ChiselParamExpanderV As ChiselingParameterExpanderV
   Dim StoneSawParamExpanderV As StoneSawingParameterExpanderV
   Dim StoneSawFinishParamExpanderV As StoneSawFinishingParameterExpanderV
   Dim StoneSawRoughParamExpanderV As StoneSawRoughingParameterExpanderV
   Dim StoneMillParamExpanderV As StoneMillingParameterExpanderV
   Dim StoneDrillParamExpanderV As StoneDrillingParameterExpanderV
   Dim SurfFinishParamExpanderV As SurfFinishingParameterExpanderV
   Dim WjParamExpanderV As WaterjettingParameterExpanderV

   Private Sub Dummy()

   End Sub

   Public ReadOnly Property ParamExpanderPageV As ContentControl
      Get

         ' !!! Inizializzo delegati con funzione vuota, per evitare problemi !!!
         MachiningTreeViewItem.m_delRemoveMachining = AddressOf Dummy
         MachiningTreeViewItem.m_delErrorOnMachining = AddressOf Dummy
         MachiningTreeViewItem.m_delIsEnabledBtns = AddressOf Dummy
         FamilyMachiningTreeViewItem.m_delIsEnabledBtns = AddressOf Dummy
         MachiningTreeViewItem.m_delNotifyPropertyChanged = AddressOf Dummy
         FamilyMachiningTreeViewItem.m_delNotifyPropertyChanged = AddressOf Dummy

         Dim sName = String.Empty
         Dim nType As Integer
         EgtGetMachiningParam(MCH_MP.NAME, sName)
         EgtGetMachiningParam(MCH_MP.TYPE, nType)
         m_CurrOperation = New MachiningTreeViewItem(sName, DirectCast(nType, MCH_MY))

         'WoodDrillParamExpanderV.DataContext = Nothing
         'WoodSawParamExpanderV.DataContext = Nothing
         'WoodMillParamExpanderV.DataContext = Nothing
         'BeamMillParamExpanderV.DataContext = Nothing
         'PocketParamExpanderV.DataContext = Nothing
         'MortiseParamExpanderV.DataContext = Nothing
         'GenMachinParamExpanderV.DataContext = Nothing
         'ChiselParamExpanderV.DataContext = Nothing
         'StoneSawParamExpanderV.DataContext = Nothing
         'StoneSawFinishParamExpanderV.DataContext = Nothing
         'StoneSawRoughParamExpanderV.DataContext = Nothing
         'StoneMillParamExpanderV.DataContext = Nothing
         'StoneDrillParamExpanderV.DataContext = Nothing
         'SurfFinishParamExpanderV.DataContext = Nothing
         'WjParamExpanderV.DataContext = Nothing

         m_CurrOperation.ReadOperationParam()

         IsModified(False)
         ErrorOnOperation(False)

         ' EgtGetMachiningParam(MCH_MP.TYPE, m_Type)
         If IsNothing(nType) Then Return Nothing

         Dim MatType As MaterialType = EgtWPFLib5.MachiningTreeViewItem.m_MatType
         EgtWPFLib5.MachiningTreeViewItem.m_MPE_SysNotes_Visibility = IniFile.m_nUserLevel > 9

         Select Case nType
            Case MCH_OY.DRILLING
               If MatType = MaterialType.STONE Then
                  If IsNothing(StoneDrillParamExpanderV) Then StoneDrillParamExpanderV = New StoneDrillingParameterExpanderV
                  StoneDrillParamExpanderV.DataContext = m_CurrOperation
                  Return StoneDrillParamExpanderV
               Else
                  If IsNothing(WoodDrillParamExpanderV) Then WoodDrillParamExpanderV = New WoodDrillingParameterExpanderV
                  WoodDrillParamExpanderV.DataContext = m_CurrOperation
                  Return WoodDrillParamExpanderV
               End If
            Case MCH_OY.SAWING
               If MatType = MaterialType.STONE Then
                  If IsNothing(StoneSawParamExpanderV) Then StoneSawParamExpanderV = New StoneSawingParameterExpanderV
                  StoneSawParamExpanderV.DataContext = m_CurrOperation
                  Return StoneSawParamExpanderV
               Else
                  If IsNothing(WoodSawParamExpanderV) Then WoodSawParamExpanderV = New WoodSawingParameterExpanderV
                  WoodSawParamExpanderV.DataContext = m_CurrOperation
                  Return WoodSawParamExpanderV
               End If
            Case MCH_OY.MILLING
               If MatType = MaterialType.BEAM Then
                  If IsNothing(BeamMillParamExpanderV) Then BeamMillParamExpanderV = New BeamMillingParameterExpanderV
                  BeamMillParamExpanderV.DataContext = m_CurrOperation
                  Return BeamMillParamExpanderV
               ElseIf MatType = MaterialType.STONE Then
                  If IsNothing(StoneMillParamExpanderV) Then StoneMillParamExpanderV = New StoneMillingParameterExpanderV
                  StoneMillParamExpanderV.DataContext = m_CurrOperation
                  Return StoneMillParamExpanderV
               Else
                  If IsNothing(WoodMillParamExpanderV) Then WoodMillParamExpanderV = New WoodMillingParameterExpanderV
                  WoodMillParamExpanderV.DataContext = m_CurrOperation
                  Return WoodMillParamExpanderV
               End If
            Case MCH_OY.SAWROUGHING
               If IsNothing(StoneSawRoughParamExpanderV) Then StoneSawRoughParamExpanderV = New StoneSawRoughingParameterExpanderV
               StoneSawRoughParamExpanderV.DataContext = m_CurrOperation
               Return StoneSawRoughParamExpanderV
            Case MCH_OY.SAWFINISHING
               If IsNothing(StoneSawFinishParamExpanderV) Then StoneSawFinishParamExpanderV = New StoneSawFinishingParameterExpanderV
               StoneSawFinishParamExpanderV.DataContext = m_CurrOperation
               Return StoneSawFinishParamExpanderV
            Case MCH_OY.POCKETING
               If MatType = MaterialType.STONE Or MatType = MaterialType.STONE5 Then
                  ' se macchina di tipo STONE ricavo il tipo di utensile
                  Dim sMachiningToolName = String.Empty
                  EgtMdbSetCurrMachining(sName)
                  EgtMdbGetCurrMachiningParam(MCH_MP.TOOL, sMachiningToolName)
                  EgtTdbSetCurrTool(sMachiningToolName)
                  Dim dValue As Double = 0
                  Dim nToolType As Integer
                  EgtTdbGetCurrToolParam(MCH_TP.TYPE, nToolType)
                  ' se utensile di tipo POLISHING rendo visibili i campi sugli epicicli
                  If nToolType = MCH_TY.MILL_POLISHING Then m_CurrOperation.Epicycles_Visibility = Visibility.Visible
               End If
               If IsNothing(PocketParamExpanderV) Then PocketParamExpanderV = New PocketingParameterExpanderV
               PocketParamExpanderV.DataContext = m_CurrOperation
               Return PocketParamExpanderV
            Case MCH_OY.MORTISING
               If IsNothing(MortiseParamExpanderV) Then MortiseParamExpanderV = New MortisingParameterExpanderV
               MortiseParamExpanderV.DataContext = m_CurrOperation
               Return MortiseParamExpanderV
            Case MCH_OY.GENMACHINING
               If IsNothing(GenMachinParamExpanderV) Then GenMachinParamExpanderV = New GenMachiningParameterExpanderV
               GenMachinParamExpanderV.DataContext = m_CurrOperation
               Return GenMachinParamExpanderV
            Case MCH_OY.CHISELING
               If IsNothing(ChiselParamExpanderV) Then ChiselParamExpanderV = New ChiselingParameterExpanderV
               ChiselParamExpanderV.DataContext = m_CurrOperation
               Return ChiselParamExpanderV
            Case MCH_OY.SURFFINISHING
               If IsNothing(SurfFinishParamExpanderV) Then SurfFinishParamExpanderV = New SurfFinishingParameterExpanderV
               SurfFinishParamExpanderV.DataContext = m_CurrOperation
               Return SurfFinishParamExpanderV
            Case MCH_OY.WATERJETTING
               If IsNothing(WjParamExpanderV) Then WjParamExpanderV = New WaterjettingParameterExpanderV
               WjParamExpanderV.DataContext = m_CurrOperation
               Return WjParamExpanderV
         End Select

         'MachiningParameterExpanderItem.ReadOperationParam()

         Return Nothing
      End Get
   End Property

#Region "Messages"

   Public ReadOnly Property UpdateMachiningBtnMsg As String
      Get
         Return EgtMsg(MSG_OPERATION + 3)        'Applica Lavorazione
      End Get
   End Property

   Public ReadOnly Property ViewToolBtnMsg As String
      Get
         Return EgtMsg(MSG_OPERATION + 13)       'Anteprima Utensile
      End Get
   End Property

   Public ReadOnly Property NextStepToolBtnMsg As String
      Get
         Return EgtMsg(MSG_OPERATION + 14)       'Avanti
      End Get
   End Property

   Public ReadOnly Property PrevStepToolBtnMsg As String
      Get
         Return EgtMsg(MSG_OPERATION + 15)       'Indietro
      End Get
   End Property

#End Region    ' Messages

   ' Definizione comando
   Private m_cmdNextStepTool As ICommand
   Private m_cmdPrevStepTool As ICommand
   Private m_cmdUpdateMachining As ICommand

#Region "CONSTRUCTOR"

   Sub New()
      EgtWPFLib5.MachiningDbWindowVM.m_sMachineIniPath = IniFile.m_sCurrMachIniFilePath

      'WoodDrillParamExpanderV = New WoodDrillingParameterExpanderV
      'WoodSawParamExpanderV = New WoodSawingParameterExpanderV
      'WoodMillParamExpanderV = New WoodMillingParameterExpanderV
      'BeamMillParamExpanderV = New BeamMillingParameterExpanderV
      'PocketParamExpanderV = New PocketingParameterExpanderV
      'MortiseParamExpanderV = New MortisingParameterExpanderV
      'GenMachinParamExpanderV = New GenMachiningParameterExpanderV
      'ChiselParamExpanderV = New ChiselingParameterExpanderV
      'StoneSawParamExpanderV = New StoneSawingParameterExpanderV
      'StoneSawFinishParamExpanderV = New StoneSawFinishingParameterExpanderV
      'StoneSawRoughParamExpanderV = New StoneSawRoughingParameterExpanderV
      'StoneMillParamExpanderV = New StoneMillingParameterExpanderV
      'StoneDrillParamExpanderV = New StoneDrillingParameterExpanderV
      'SurfFinishParamExpanderV = New SurfFinishingParameterExpanderV
      'WjParamExpanderV = New WaterjettingParameterExpanderV

      NotifyPropertyChanged("ParamExpanderPageV")
   End Sub

#End Region    ' Constructor

#Region "COMMANDS"

#Region "NextStepToolCommand"

   ''' <summary>
   ''' Restituisce funzione per ricalcolo lavorazione.
   ''' </summary>
   Public ReadOnly Property NextStepToolCommand As ICommand
      Get
         If m_cmdNextStepTool Is Nothing Then
            m_cmdNextStepTool = New RelayCommand(AddressOf NextStepTool)
         End If
         Return m_cmdNextStepTool
      End Get
   End Property

   ''' <summary>
   ''' Ricalcola una lavorazione.
   ''' </summary>
   Public Sub NextStepTool(ByVal param As Object)
      If m_bPreviewTool Then
         Dim nNextId = EgtPreviewMachiningTool(m_nPtEntId, MCH_PTM.AFTER)
         If nNextId <> GDB_ID.NULL Then m_nPtEntId = nNextId
         EgtDraw()
      End If
   End Sub

#End Region    ' NextStepToolCommand

#Region "PrevStepToolCommand"

   ''' <summary>
   ''' Restituisce funzione per ricalcolo lavorazione.
   ''' </summary>
   Public ReadOnly Property PrevStepToolCommand As ICommand
      Get
         If m_cmdPrevStepTool Is Nothing Then
            m_cmdPrevStepTool = New RelayCommand(AddressOf PrevStepTool)
         End If
         Return m_cmdPrevStepTool
      End Get
   End Property

   ''' <summary>
   ''' Ricalcola una lavorazione.
   ''' </summary>
   Public Sub PrevStepTool(ByVal param As Object)
      If m_bPreviewTool Then
         Dim nPrevId = EgtPreviewMachiningTool(m_nPtEntId, MCH_PTM.BEFORE)
         If nPrevId <> GDB_ID.NULL Then m_nPtEntId = nPrevId
         EgtDraw()
      End If
   End Sub

#End Region    ' PrevStepToolCommand

#Region "UpdateMachiningCommand"

   ''' <summary>
   ''' Restituisce funzione per ricalcolo lavorazione.
   ''' </summary>
   Public ReadOnly Property UpdateMachiningCommand As ICommand
      Get
         If m_cmdUpdateMachining Is Nothing Then
            m_cmdUpdateMachining = New RelayCommand(AddressOf UpdateMachining)
         End If
         Return m_cmdUpdateMachining
      End Get
   End Property

   ''' <summary>
   ''' Ricalcola una lavorazione.
   ''' </summary>
   Public Sub UpdateMachining(ByVal param As Object)
      ' Verifico la presenza di errori: se ci sono li mostro in una MessageBox ed esco da UpdateMachining
      If m_CurrOperation_ErrorOnOperation Then
         Dim sErrorList As String = String.Empty
         For Each [property] As String In EgtWPFLib5.MachiningTreeViewItem.ValidatedProperties
            If Not String.IsNullOrEmpty(m_CurrOperation.GetErrorString([property])) Then
               sErrorList += Environment.NewLine + " - " + m_CurrOperation.GetErrorString([property])
            End If
         Next [property]
         MessageBox.Show(EgtMsg(5423) + sErrorList, EgtMsg(30009), MessageBoxButton.OK, MessageBoxImage.Exclamation)
         Return
      End If
      Dim bRecalc As Boolean = ((Keyboard.Modifiers And ModifierKeys.Shift) = ModifierKeys.Shift)
      ' La modifica di alcuni parametri forza il ricalcolo della geometria
      Dim ModifiedGeometry As Boolean = m_CurrOperation.m_IsModifiedSelectedFaceUseType
      ' aggiorno valori modificati
      m_CurrOperation.WriteOperationParam()
      ' Carico tutta la geometria selezionata in una lista
      Dim SelectedGeometry As New List(Of Integer)
      Dim EntityIndex As Integer = EgtGetFirstSelectedObj()
      While EntityIndex <> GDB_ID.NULL
         SelectedGeometry.Add(EntityIndex)
         EntityIndex = EgtGetNextSelectedObj()
      End While
      ' Gestione speciale per superfici ( si aggiunge l'identificazione della faccia)
      If SelectedGeometry.Count() > 0 AndAlso
         (EgtGetType(SelectedGeometry(0)) = GDB_TY.SRF_MESH Or EgtGetType(SelectedGeometry(0)) = GDB_TY.SRF_FRGN) Then
         ' Aggiorno lista speciale con facce
         SelData.VerifyIdSub()
         ' Verifico se geometria cambiata, confrontando selezione attuale con facet con geometria di lavorazione
         Dim nInd As Integer = 0
         Dim nMchId, nMchSub As Integer
         EgtGetMachiningGeometry(nInd, nMchId, nMchSub)
         Dim nSelId, nSelSub As Integer
         SelData.GetIdSub(nInd, nSelId, nSelSub)
         While Not ModifiedGeometry And (nMchId <> GDB_ID.NULL Or nSelId <> GDB_ID.NULL)
            ' Controllo uguaglianza
            If nMchId <> nSelId Or nMchSub <> nSelSub Then ModifiedGeometry = True
            ' Passo al successivo
            nInd += 1
            EgtGetMachiningGeometry(nInd, nMchId, nMchSub)
            SelData.GetIdSub(nInd, nSelId, nSelSub)
         End While
         If ModifiedGeometry Then
            Dim vId() As Integer = Nothing
            Dim vSub() As Integer = Nothing
            SelData.GetAllIdSub(vId, vSub)
            EgtSetMachiningGeometry(vId, vSub)
         End If
         ' Gestione standard per altre entità (curve, testi, ...)
      Else
         ' Verifico se geometria cambiata, confrontando selezione attuale con geometria di lavorazione
         Dim nInd As Integer = 0
         Dim nMchId, nMchSub As Integer
         EgtGetMachiningGeometry(nInd, nMchId, nMchSub)
         Dim nSelId As Integer
         nSelId = If(nInd < SelectedGeometry.Count(), SelectedGeometry(nInd), GDB_ID.NULL)
         While Not ModifiedGeometry And (nMchId <> GDB_ID.NULL Or nSelId <> GDB_ID.NULL)
            ' Controllo uguaglianza
            If nMchId <> nSelId Then ModifiedGeometry = True
            ' Passo al successivo
            nInd += 1
            EgtGetMachiningGeometry(nInd, nMchId, nMchSub)
            nSelId = If(nInd < SelectedGeometry.Count(), SelectedGeometry(nInd), GDB_ID.NULL)
         End While
         ' Imposto geometria selezionata come geometria di lavorazione
         If ModifiedGeometry Then
            EgtSetMachiningGeometry(SelectedGeometry.ToArray)
         End If
      End If
      ' Ricalcolo la lavorazione
      If Not EgtApplyMachining(bRecalc Or ModifiedGeometry) Then
         If EgtGetLastMachMgrErrorId() <> 0 Then
            Dim sErr As String = EgtGetLastMachMgrErrorString()
            Dim sInfo As String = String.Empty
            EgtGetOutstrokeInfo(sInfo)
            If Not String.IsNullOrEmpty(sInfo) Then sErr &= " " & sInfo
            MessageBox.Show(sErr, EgtMsg(5305), MessageBoxButton.OK, MessageBoxImage.Exclamation)
         Else
            ' Errore nel calcolo della lavorazione!
            MessageBox.Show(EgtMsg(5345), EgtMsg(5305), MessageBoxButton.OK, MessageBoxImage.Error)
         End If
      Else
         If EgtGetMachMgrWarningId(0) <> 0 Then
            Dim sWarn As String = EgtGetMachMgrWarningString(0)
            Map.refStatusBarVM.NotifyStatusOutput(sWarn)
         Else
            Map.refStatusBarVM.NotifyStatusOutput("")
         End If
      End If
      ' Restart visualizzazione utensile
      If m_bPreviewTool Then
         EgtPreparePreviewMachiningTool()
         m_nPtEntId = EgtPreviewMachiningTool(GDB_ID.NULL, MCH_PTM.AFTER)
      End If
      IsModified(False) ' NotifyPropertyChanged("UpdateMachiningBtn_Background")
      ErrorOnOperation(False)
      EgtDraw()
      Map.refProjectVM.EmitTitle()
   End Sub

#End Region    ' UpdateMachiningCommand

#End Region    ' Commands

   Private Sub IsModified(IsModified As Boolean) Handles m_CurrOperation.m_IsModified
      m_CurrOperation_IsModified = IsModified
      ' NotifyPropertyChanged("CurrOperation_IsModified")
      NotifyPropertyChanged("UpdateMachiningBtn_Background")
   End Sub

   Private Sub ErrorOnOperation(ErrorOnOperation As Boolean) Handles m_CurrOperation.m_ErrorOnOperation
      m_CurrOperation_ErrorOnOperation = ErrorOnOperation
      ' NotifyPropertyChanged("CurrOperation_ErrorOnOperation")
      NotifyPropertyChanged("UpdateMachiningBtn_Background")
   End Sub

End Class

''' <summary>
''' Class that represent a Converter that use machining type and param type, to set the visibility state of the param type.
''' </summary>
Public Class OperationParamVisibilityConverter
   Implements IValueConverter

   Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.Convert
      Select Case CInt(value)
         Case MCH_OY.NONE
            Return Visibility.Hidden
         Case MCH_OY.DISP
            Return TMDbParamVisibility.OperationDisposition(CInt(parameter))
         Case MCH_OY.DRILLING
            Return TMDbParamVisibility.Drilling(CInt(parameter))
         Case MCH_OY.SAWING
            Return TMDbParamVisibility.Sawing(CInt(parameter))
         Case MCH_OY.MILLING
            Return TMDbParamVisibility.Milling(CInt(parameter))
         Case MCH_OY.POCKETING
            Return TMDbParamVisibility.Pocketing(CInt(parameter))
         Case MCH_OY.MORTISING
            Return TMDbParamVisibility.Mortising(CInt(parameter))
         Case MCH_OY.SAWROUGHING
            Return TMDbParamVisibility.Sawroughing(CInt(parameter))
         Case MCH_OY.SAWFINISHING
            Return TMDbParamVisibility.Sawfinishing(CInt(parameter))
         Case MCH_OY.GENMACHINING
            Return TMDbParamVisibility.GenMachining(CInt(parameter))
         Case MCH_OY.CHISELING
            Return TMDbParamVisibility.Chiseling(CInt(parameter))
         Case MCH_OY.SURFFINISHING
            Return TMDbParamVisibility.SurfFinishing(CInt(parameter))
         Case MCH_OY.WATERJETTING
            Return TMDbParamVisibility.WaterJetting(CInt(parameter))
         Case Else
            Return Visibility.Hidden
      End Select
   End Function

   Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.ConvertBack
      Throw New NotImplementedException
   End Function

End Class

''' <summary>
''' Class that represent a Converter that convert mm in inch if necessary for the param depth.
''' </summary>
Public Class DepthUnitConverter
   Implements IValueConverter

   Friend Const INCHTOMM As String = "*25.4"
   Friend Const INCHSYMBOL As String = """"


   Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.Convert
      If Not IsNothing(value) Then
         value = CStr(value).Replace(INCHTOMM, INCHSYMBOL)
      End If
      Return value
   End Function

   Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.ConvertBack
      If Not IsNothing(value) Then
         value = CStr(value).Replace(INCHSYMBOL, INCHTOMM)
      End If
      Return value
   End Function

End Class