fMetric (USHORT)

      Control metric.

      Control metric to be queried with this message. This can be either of the following:

      VMA_ITEMSIZE

        If this message attribute is set, the width and height of each item (in pixels) are returned in the usItemWidth and usItemHeight parameters, respectively.
      VMA_ITEMSPACING
        If this message attribute is set, the horizontal and vertical spacing between items (in pixels) is returned in the usHorzItemSpacing parameter and in the usVertItemSpacing parameter, respectively.


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