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  \item{x}{An object of class \code{"grob"} or NULL.}
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  \item{x}{An object of class \code{"grob"} or NULL.}
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  \item{recording}{A logical value to indicate whether the drawing
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  \item{recording}{A logical value to indicate whether the drawing
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    operation should be recorded on the Grid display list.}
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    operation should be recorded on the Grid display list.}
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}
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}
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\details{
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\details{
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  This is a generic function with methods for grob and gTree objects.
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  This is a generic function with methods for grob and \I{gTree} objects.
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  The grob and gTree methods automatically push any viewports in a
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  The grob and \I{gTree} methods automatically push any viewports in a
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  \code{vp} slot and automatically apply any \code{gpar} settings
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  \code{vp} slot and automatically apply any \code{gpar} settings
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  in a \code{gp} slot.  In addition, the gTree method pushes and
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  in a \code{gp} slot.  In addition, the \I{gTree} method pushes and
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  ups any viewports in a \code{childrenvp} slot and automatically
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  ups any viewports in a \code{childrenvp} slot and automatically
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  calls \code{grid.draw} for any grobs in a \code{children} slot.
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  calls \code{grid.draw} for any grobs in a \code{children} slot.
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  The methods for grob and gTree call the generic hook functions
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  The methods for grob and \I{gTree} call the generic hook functions
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  \code{preDrawDetails}, \code{drawDetails}, and \code{postDrawDetails}
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  \code{preDrawDetails}, \code{drawDetails}, and \code{postDrawDetails}
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  to allow classes derived from grob or gTree to perform
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  to allow classes derived from grob or \I{gTree} to perform
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  additional viewport pushing/popping and produce additional
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  additional viewport pushing/popping and produce additional
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  output beyond the default behaviour for grobs and gTrees.
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  output beyond the default behaviour for grobs and \I{gTree}s.
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}
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}
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\value{
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\value{
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  None.
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  None.
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}
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}
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\author{Paul Murrell}
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\author{Paul Murrell}