Run Macro only if selected by left click

Excel Version: 2013 Professional Plus

I am trying to make a cell change values only if it is selected by a left click.

I tried to fix it by adding in "if left clicked" macro I found online that allows left clicks to be tracked by VBA.

Unfortunately, Public Declare Function is not allowed in the Microsoft Excel Objects, and changing it to Private seems to make the code not run at all (after I click, nothing activates, not even error pop up)

How can I fix this? And is there better way of getting macros to activate only with left click on cell?

Code:

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Public Declare Function GetAsyncKeyState Lib "user32" _        (ByVal vKey As Long) As Integer


Private Sub Worksheet_SelectionChange(ByVal Target As Range)
   
   
Application.ScreenUpdating = False
   
    For n = 7 To 25
       
        'Set thisCell = Range(Cells(n, "H"))
        If Target.Address = Cells(n, "H").Address Then
            If GetAsyncKeyState(vbKeyLButton) And &H8000 Then
                If Cells(n, "H") = 0 Then
                    If Cells(n, "I") = 3 Then
                        Cells(n, "H") = 1
                        Range(Cells(n, "F"), Cells(n, "G")).Select
                        Exit Sub
                    ElseIf Cells(n, "I") = 2 Then
                        MsgBox "System is 'In-Work'"
                    ElseIf Cells(n, "I") = 1 Then
                        MsgBox "System is 'Line Stopped'"
                    End If
           
                ElseIf Cells(n, "H") = 1 Then
                    Cells(n, "H") = 0
                    Range(Cells(n, "F"), Cells(n, "G")).Select
                    Exit Sub
           
                Else
                    Cells(n, "H") = 0
                    Range(Cells(n, "F"), Cells(n, "G")).Select
                    Exit Sub
           
                End If
            End If
        End If
   
    Next
   
Application.ScreenUpdating = True


End Sub

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It is built in to allow macros to run only on a doubleclick

Code:

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Option Explicit

Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean)

If Intersect(Range("H7:H5"), Target) Is Nothing Then Exit Sub
Cancel = True

'Only change the cells in the doubleclicked Row
If Target = 0 Then
  Select Case Target.Offset(, 1)
    Case 1: MsgBox "System is 'Line Stopped'"
    Case 2: MsgBox "System is 'In-Work'"
    Case 3: Target = 1
    Case Else 'Do Nothing
  End Select

ElseIf Target = 1 Then
    Target = 0
Else 'Do Nothing
End If

Rows(Target.Row).Range("F1:G1").Select
End Sub

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Thank you for this! Not only did you solve my problem, but you showed me a better way to script.

One question though. I noticed by adding ",Cancel As Boolean" and "Cancel = True" changes the previous macro from "select to activate" to "double click to activate". What is the logic behind this?

Code:

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adding ",Cancel As Boolean" and "Cancel = True" changes the previous  macro from "select to activate" to "double click to activate".

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That's not what happened. I gave you a different Event Sub. I didn't "add" Cancel. It is an intrinsic requirement of the BeforeDoubleClick Event sub.

Ahh, I see. I didn't see the different event.

Thank you SamT.