First, working with merged cells is a real pain.
They don't behave nicely in lots of situations (autofitting row height is just
the tip of the iceberg!)
Second, excel doesn't keep track of what cells are changed because of a
calculation. So you'd have to look through all the cells with formulas which
could be a pain, too.
Third, there's no easy way to find merged cells.
That said...
Jim Rech wrote a macro called AutoFitMergedCellRowHeight:
http://groups.google.com/groups?threadm=e1$1uzL1BHA.1784@tkmsftngp05
This could be modified to tie into a worksheet_calculate event.
If you want to try...
This goes behind the worksheet that has the merged cells with formulas in it.
Option Explicit
Private Sub Worksheet_Calculate()
Dim myRng As Range
Dim myCell As Range
'define your range with the addresses of the
'merged cells formulas
'or give it a nice name
'Set myRng = Me.Range("a1,b3,c7")
'Set myRng = Me.Range("MyMergedCells")
'or look through all the formulas
Set myRng = Nothing
On Error Resume Next
Set myRng = Me.Cells.SpecialCells(xlCellTypeFormulas)
On Error GoTo 0
If myRng Is Nothing Then
Exit Sub 'no formulas found
End If
On Error Resume Next
Application.EnableEvents = False
For Each myCell In myRng.Cells
If myCell.MergeArea.Cells.Count = 1 Then
'do nothing, not a merged cell
Else
Call AutoFitMergedCellRowHeight(ActCell:=myCell)
End If
Next myCell
Application.EnableEvents = True
On Error GoTo 0
End Sub
You'll want to use what's best for you in this portion:
'define your range with the addresses of the
'merged cells formulas
'or give it a nice name
'Set myRng = Me.Range("a1,b3,c7") 'Option 1
'Set myRng = Me.Range("MyMergedCells") 'Option 2
'or look through all the formulas 'Option 3 (next 4 lines)
Set myRng = Nothing
On Error Resume Next
Set myRng = Me.Cells.SpecialCells(xlCellTypeFormulas)
On Error GoTo 0
My preference would be to use the named range (select the cells and then
insert|name|define). Then I wouldn't be looking through all the formulas with
each calculation. (If you move cells to a new location (inserting/deleting rows
or columns), you'd have to adjust that list of addresses.)
You can comment the options you don't want--and uncomment the line(s) that you
want to use.
This portion does all the work. It goes in a General module (Insert|Module
inside the VBE).
Option Explicit
''based on Jim Rech's code
''
http://groups.google.com/groups?threadm=e1$1uzL1BHA.1784@tkmsftngp05
''Simulates row height autofit for a merged cell if the active cell..
'' is merged.
'' has Wrap Text set.
'' includes only 1 row.
''Unlike real autosizing the macro only increases row height
'' (if needed). It does not reduce row height because another
'' merged cell on the same row may needed a greater height
'' than the active cell.
Sub AutoFitMergedCellRowHeight(ActCell As Range)
Dim CurrentRowHeight As Single, MergedCellRgWidth As Single
Dim CurrCell As Range
Dim ActiveCellWidth As Single, PossNewRowHeight As Single
If ActCell.MergeCells Then
With ActCell.MergeArea
If .Rows.Count = 1 And .WrapText = True Then
Application.ScreenUpdating = False
CurrentRowHeight = .RowHeight
ActiveCellWidth = ActCell.ColumnWidth
For Each CurrCell In .Cells
MergedCellRgWidth _
= CurrCell.ColumnWidth + MergedCellRgWidth
Next CurrCell
.MergeCells = False
.Cells(1).ColumnWidth = MergedCellRgWidth
.EntireRow.AutoFit
PossNewRowHeight = .RowHeight
.Cells(1).ColumnWidth = ActiveCellWidth
.MergeCells = True
.RowHeight = IIf(CurrentRowHeight > PossNewRowHeight, _
CurrentRowHeight, PossNewRowHeight)
End If
End With
End If
End Sub
Notice the comment in Jim's code:
''Unlike real autosizing the macro only increases row height
'' (if needed). It does not reduce row height because another
'' merged cell on the same row may needed a greater height
'' than the active cell.
