Public Function Ellipsize( _
    strInput As String, _
    Optional MaxLength As Integer = 16 _
) As String
    If Len(strInput) > MaxLength Then
        Ellipsize = Left(strInput, MaxLength) & Chr(133)
        Ellipsize = strInput
    End If
End Function


Public Function TransferRangeDataAsArray( _
    rngSource As Range, _
    rngTarget As Range, _
    Optional xlrvd As XlRangeValueDataType = xlRangeValueDefault _
) As Range
    Set TransferRangeDataAsArray = _
        rngTarget.Resize( _
            rngSource.Rows.Count, _
            rngSource.Columns.Count _
    TransferRangeDataAsArray.Value( _
        xlrvd _
    ) = _
        rngSource.Value( _
            xlrvd _
    End Function
HasKey Function


Function HasKey( _
    coll As Collection, _
    index As Variant _
) As Boolean
On Error GoTo ErrorHandler
    Dim elTest As Variant
    HasKey = False
    elTest = coll(index)
    HasKey = True
    Exit Function
End Function


Function ElapsedTime( _
    endTime As Date, _
    startTime As Date _
) As String
    Dim Interval As Date
    ' Calculate the time interval.
    Interval = endTime - startTime
    ' Format and print the time interval in 
    ' days, hours, minutes and seconds.
    ElapsedTime = _
        Int( _
            CSng( _
                Interval _
            ) _
        ) & _
        " days " & _
        Format( _
            Interval, _
            "hh" _
        ) & _
        " Hours " & _
        Format( _
            Interval, _
            "nn" _
        ) & _
        " Minutes " & _
        Format( _
            Interval, _
            "ss" _
        ) & _
        " Seconds"
End Function

This has been adapted from https://docs.microsoft.com/en-us/office/vba/access/concepts/date-time/calculate-elapsed-time



Public Sub RenderListControlHeadings( _
    ListControl As Control, _
    ColumnHeadingString As String, _
    Optional FontWeight As Long = 400, _
    Optional OffsetLeft As Long = 8 _
    Dim ctls As Controls
    Dim iCtl As Control
    Dim strControlNameStub As String
    Dim strLabelNameStub As String
    Set ctls = ListControl.Parent.Controls
    strLabelNameStub = "lbheading_"
    strControlNameStub = _
        strLabelNameStub & _
    Set ctls = ListControl.Parent.Controls
    For Each iCtl In ctls
        If Left( _
            iCtl.Name, _
            Len( _
                strControlNameStub _
            ) _
        ) = strControlNameStub Then
            ctls.Remove iCtl.Name
        End If
    Next iCtl
    If ColumnHeadingString = "" Then Exit Sub
    Dim arrWidths As Variant
    Dim arrHeadings As Variant
    arrWidths = Split( _
        ListControl.ColumnWidths, _
        ";" _
    arrHeadings = Split( _
        ColumnHeadingString, _
        ";" _
    Dim i As Integer
    Dim accLeftPosition As Long
    accLeftPosition = ListControl.Left + OffsetLeft
    For i = 0 To UBound(arrHeadings)
        With ctls.Add( _
            "Forms.Label.1", _
            strControlNameStub & i _
            .Caption = arrHeadings(i)
            .Left = accLeftPosition
            .Top = ListControl.Top - 12
            .Font.Size = 7
            .Font.Weight = FontWeight
            .BackStyle = fmBackStyleTransparent
        End With
        accLeftPosition = _
            accLeftPosition + _
            CLng( _
                Trim( _
                    Replace( _
                        arrWidths(i), _
                        " pt", "" _
                    ) _
                ) _
    Next i
End Sub


Public Sub DeleteAllFilesInFolder( _
    strPathToFolder As String _
    Dim _
        fs As Object, _
        fldr As Object, _
        f As Object
    Set fs = CreateObject("Scripting.FileSystemObject")
    Set fldr = fs.GetFolder(strPathToFolder)
    For Each f In fldr.Files
        Application.StatusBar = _
            "Deleting file " & _
            f.Name & _
            " from folder " & _
        f.Delete True
    Set f = Nothing
    Set fldr = Nothing
    Set fs = Nothing
    Application.StatusBar = False
End Sub


Public Function HasHiddenColumns( _
  rng As Range _
) As Boolean
  Dim _
    rngColumn As Range
  HasHiddenColumns = False
  For Each rngColumn In rng.Columns
    If rngColumn.Hidden Then
      HasHiddenColumns = True
    End If
  Next rngColumn
End Function


Dim _
  wsSource As Worksheet, _
  rngSource as Range
Set wsSource = ThisWorkbook.Sheets("Sheet1")
Set rngSource = wsSource.Range("A1", "K32")
If HasHiddenColumns( _
  rngSource _
) Then
  ' Handle it
End If
Notes on Style

Notes on VBA Coding Style: Maximizing Scalability and Readability

Establishing and adhering to a VBA coding style guide enables increased project reusability and scalability. It makes code more readable and, by extension, the coding experience far more enjoyable.

Notes on VBA Coding Style

Minimize Horizontal Scrolling

Split lines (use the underscore!) and indent. My rationale is that horizontal scrolling takes too long. You want to be able to scan through your code quickly. You also want to be able to view code modules side-by-side, which ties into another upcoming post (TODO…) regarding code modularity – specifically, if your procedure is going to be lengthy, consider placing it in its own module, and ALWAYS use a naming convention. This applies to variables and modules. Pick a convention and stick to it. The VBE (Visual Basic Editor) has split screen, but that only works with a horizontal separator. It is helpful to be able to view code side-by-side, particularly if you’re writing class definitions that may have similar implementations. If your lines are short, you can view more modules side-by-side.

The screenshot illustrates the following conventions that I like to use:

Split line after open parentheses and each parameter

This includes the first line of any procedure definition (Sub, Property, Function).
Each parameter should be on its own line. Be mindful of proper syntax with regards to commas. This will drive you crazy if you’re not careful. The debugger is your friend. So, for instance:

Function MyFunction( _
  strParamOne as String, _
  strParamTwo as String, _
  intParamCounter as Integer, _
  strLastParam as String _

Note the comma-space-underscore syntax for all parameters except the last one. The debugger will yell at you about this, but do yourself a favor and form the habit.

Split line after Dim statement when declaring multiple variables

This ties into my convention for splitting lines after multiple parameters. It may not be necessary for single parameters, but consider that VBA permits you to use up to 1,203 characters to name your variables. That enables you to be descriptive with your variable names, which you should be, because someone will probably have to decipher that code of yours eventually – and it might just be you. NEVER use non-descriptive variable names such as a, b, c or x, y, z. Just don’t do it. So, conserve your horizontal space on each line.  For instance:

Dim strMyVariable as String

Keeping a single variable declaration on one line may be acceptable. It’s up to you. Just make a decision and stick to it. If you have a long variable name, you might want to conserve some space like this:

Dim _
  strWorksheetNameConcatenatedFromSourceWorkbook as String

When declaring multiple variables, I like to give them each their own indented line:

Dim _
  strMyFirstVariable as String, _
  strMySecondVariable as String, _
  intMyThirdVariable as Integer, _
  strMyLastVariable as String

Split lengthy strings into separate lines

Your mileage may vary on this, but I think 80 characters is a good limit to set. Split your strings and concatenate them with an ampersand, then use ampersand-space-underscore to split your lines:

strMyLongString = _
  "This will be a " & _
  "run-on sentence with " & _
  "a few variables thrown in " & _
  "here: " & _
  strMyFirstConcatenatedStringElement & _
  " and here: " & _
  strMySecondConcatenatedStringElement & _
  " to properly illustrate my " & _

Note that there is a limit on VBA line continuations (see Microsoft Office Dev Center Article). Per the specs: Your code should have no more than 25 physical lines joined with line-continuation characters or more than 24 consecutive line-continuation characters in a single line. Make some of the constituent lines physically longer to reduce the number of line-continuation characters needed, or break the construct into more than one statement.

Be Verbose

Function and Object names get compiled down so their length does not affect performance. VBA is meant to enable verbosity. Use camel case and name your functions and objects explicitly. Establish a naming convention early on if possible. For example, the following variable has a three letter prefix indicating its data type (string, in this case), then a concise camel case description of the variable’s purpose. 


Whether you use this VBA coding style guide or build your own, the important thing is to adhere to it throughout your project, especially if you are working with a team. It helps to speak the same language, both programmatically and stylistically. The less guesswork is involved, the more efficiently you can get things done.

Export Modules

Export Modules to Folder

This will create a folder using the base name of your Excel file, which is the filename without its extension, along with a vba subfolder. Your VBA modules will be placed there.
Set Reference to Microsoft Visual Basic for Applications Extensibility

Sub ExportModules( _
    Optional PathToVBAModules As String = "" _
    Dim objMyProj As VBProject
    Dim objVBComp As VBComponent
    Dim strExt As String
    Set objMyProj = Application.VBE.ActiveVBProject
    If PathToVBAModules = "" Then
        MakeFolder _
            ThisWorkbook.Path & _
            "\" & _
            GetBaseName( _
                ThisWorkbook.Name _
            ) & _
        MakeFolder _
            ThisWorkbook.Path & _
            "\" & _
            GetBaseName( _
                ThisWorkbook.Name _
            ) & _
        PathToVBAModules = _
            ThisWorkbook.Path & _
            "\" & _
            GetBaseName( _
                ThisWorkbook.Name _
            ) & _
        ' Leave provided path
    End If
    For Each objVBComp In objMyProj.VBComponents
        Select Case objVBComp.Type
            Case vbext_ct_StdModule
                strExt = ".bas"
            Case vbext_ct_ClassModule
                strExt = ".cls"
            Case vbext_ct_MSForm
                strExt = ".frm"
            Case vbext_ct_Document
                strExt = ".txt"
        End Select
        objVBComp.Export PathToVBAModules & objVBComp.Name & strExt
End Sub