PPT: Sample Code to Change the Zoom Percentage

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Sample Visual Basic Procedure

   Sub ChangeView()

      ' The smallest percentage you can use is 10%.
      Const MinViewPercent As Long = 10

      ' The largest percentage you can use is 400%.
      Const MaxViewPercent As Long = 400

      ' Stores the results of the MsgBox selection.
      Dim lResult As Long

      Dim lCurrentViewPercentage As Long
      Dim lNewViewPercentage As Long

      ' Get the current view percentage.
      lCurrentViewPercentage = ActiveWindow.View.Zoom

      ' Calculate a new view by dividing the old view by 2.
      lNewViewPercentage = (lCurrentViewPercentage / 2)

      ' Check to see if OK to change the percentage. If you apply a view
      ' percentage less then 10, a run-time error results. This code
      ' ensures a valid zoom is assigned.
      If lNewViewPercentage >= MinViewPercent Then

         ' Assign the calculated percentage to the zoom percentage.
         ActiveWindow.View.Zoom = lNewViewPercentage

      Else

         ' If percentage goes out of range set to minimum level.
         ActiveWindow.View.Zoom = MinViewPercent

      End If

      ' See whether a change was made to the zoom percentage.
      If lCurrentViewPercentage = ActiveWindow.View.Zoom Then

         ' No change was made.
         MsgBox "No change was made. Your zoom percentage is already " _
         & "set to the minimum percentage.", vbInformation, _
         "Minumin Already Set"

      Else

         ' A change to the zoom percentage was made.
         ' Option to restore the original zoom percentage.
         lResult = MsgBox("The zoom percentage was changed to " _
                   & ActiveWindow.View.Zoom & "%. " _
                   & "Do you want to restore your original " _
                   & "zoom percentage of " & lCurrentViewPercentage _
                   & "%?", vbYesNo, "Restore Original Percentage")

         ' See whether they clicked the Yes button.
         If lResult = vbYes Then
            ActiveWindow.View.Zoom = lCurrentViewPercentage
         End If

      End If

   End Sub