Set Variable equal to multiple selected cells - vba

Question

I am attempting to get my code to work when multiple cells are selected/changed. I'm not too sure where to go from here as I'm having trouble setting a variable to a target when the target is a multi-cell selection.
An example of what I need would be: All cells in column 1 are selected and deleted, so subsequently I want all cells in column 2 to also be deleted. Instead the code returns an error and does not delete column 2 for any of the selected rows.
Here is the code:
Option Explicit
Private Sub Worksheet_Change(ByVal Target As Range)
On Error Resume Next
Application.ScreenUpdating = False
If Target.Column = 1 Then
Application.EnableEvents = False
Dim OldValue As String
Dim NewValue As String
NewValue = Target.Value
Application.Undo
OldValue = Target.Value
Target.Value = NewValue
Application.EnableEvents = True
If OldValue = "" Then
Exit Sub
Else
Application.EnableEvents = False
Target.Offset(0, 1).ClearContents
MsgBox "Contents related to this drop-down have been cleared"
End If
End If
Exithandling:
Application.EnableEvents = True
Exit Sub
Application.ScreenUpdating = True
End Sub

Answer 1

Something like this:
Private Sub Worksheet_Change(ByVal Target As Range)
Dim rng As Range, oldVal, newVal, i As Long, num As Long, c As Range
On Error GoTo haveError:
'only process the part of Target which overlaps with ColA...
Set rng = Application.Intersect(Target, Me.Columns(1))
'run some checks before proceeding...
If rng Is Nothing Then Exit Sub
If rng.Cells.Count = Me.Columns(1).Cells.Count Then Exit Sub 'ignore full-column operations
If rng.Areas.Count > 1 Then Exit Sub 'handling multiple areas will be more complex...
If Application.CountBlank(rng) = 0 Then Exit Sub 'no empty cells: nothing to do here
Application.EnableEvents = False
newVal = GetArray(rng)
Application.Undo
oldVal = GetArray(rng)
rng.Value = newVal
For Each c In rng.Cells
i = i + 1
If newVal(i, 1) = "" And oldVal(i, 1) <> "" Then
c.Offset(0, 1).ClearContents
num = num + 1
End If
Next c
If num > 0 Then MsgBox "Contents related to drop-down(s) have been cleared"
haveError:
If Err <> 0 Then Debug.Print Err.Description
Application.EnableEvents = True
End Sub
'normalizes the array vs. scalar returned when calling .Value
' on a multi- vs. single-cell range
Function GetArray(rng As Range)
Dim arr
If rng.Count > 1 Then
arr = rng.Value
Else
ReDim arr(1 To 1, 1 To 1)
arr(1, 1) = rng.Value
End If
GetArray = arr
End Function