Using relative references to reuse a macro for a control - vba

Question

I'm trying to write an Excel 2007 macro for a coworker, but my VBA skills are pretty basic (pardon the pun). Essentially, what needs to happen is, when a checkbox is clicked, the neighboring cell to the right is filled with the username of the person logged in.
So far, here's the code I've come up with that allows me to do that:
Sub CheckBox1_Click()
Range("J4").Activate
If ActiveCell.Offset(0, 18).Value = True Then
ActiveCell.Offset(0, 1).Value = Environ("UserName")
Else
ActiveCell.Offset(0, 1).Clear
End If
End Sub
Just for the sake of reference, that "ActiveCell.Offset(0,18)" refers to a cell that is linked to the checkbox in question and contains its true/false value.
(EDIT: Also, the reason cell J4 is activated is because in this case, it's the cell containing the ActiveX checkbox)
That works perfectly, but that's not my problem. My problem is this: there are 49 more checkboxes in that row, and three more rows on this sheet, and 45 more sheets in this book. I do NOT want to have to copy paste the same code into a unique macro just to change the active cell. More importantly, as a good programmer, I shouldn't be repeating code like that. How should I write this so that I don't have to refer to a distinct cell every time?
EDIT 2: Holy smokes, Lance just helped me realize I was mistaken. The sheet uses form controls, not ActiveX controls. Greatly sorry, everyone.

Answer 1

While this is easy to do with a Sheet object, it's pretty hard to do with an ActiveX Control object. You can't self-reference the name of an ActiveX Control in its event, unless it's passed to it, and you also can't reference the name of the event subroutine to extract the name, and you can't reference the name of the routine that called a routine.
I also attempted to trigger off of the Worksheet Change and SelectionChange events, but those don't trigger off of a checkbox change, even if it has a LinkedCell that changes
What I finally came up with was the somewhat generic wrapper for the click event, that you'll have to modify the string to match the Checkbox name:
Private Sub CheckBox1_Click()
NameCopy Me, "CheckBox1"
End Sub
and then a Namecopy function that sets the cell -7 to the left of the LinkedCell to the name value.
Public Sub NameCopy(wsheet As Worksheet, cname As String)
If wsheet.OLEObjects(cname).Object.Value = True Then
Range(wsheet.OLEObjects(cname).LinkedCell).Offset(0, -7).Value = Environ("UserName")
End If
End Sub
It's easier with a Forms checkbox, you can use this Macro for all your checkboxes. Just remember to set the Macro to this:
Public Sub NameCopy()
Dim shp As Shape
Set shp = ActiveSheet.Shapes(Application.Caller)
If shp.ControlFormat.Value = xlOn Then
ActiveSheet.Range(shp.ControlFormat.LinkedCell).Offset(0, -7).Value = Environ("UserName")
End If
End Sub

Answer 2

Since you are using form controls, this is really easy. You can use Application.Caller to have the code access the clicked checkbox, and then use it's TopLeftCell property to get where the checkbox is located, and then you can perform whatever operation you want. In your case, something like this I'm guessing:
Sub Checkbox_Click()
With ActiveSheet.CheckBoxes(Application.Caller)
If .Value = 1 Then 'Checkbox is checked
.TopLeftCell.Offset(, 1).Value = Environ("UserName")
Else
.TopLeftCell.Offset(, 1).ClearContents
End If
End With
End Sub