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\title{ List the names of grobs or viewports }
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\title{ List the names of grobs or viewports }
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\description{
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\description{
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  Return a listing of the names of grobs or viewports.
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  Return a listing of the names of grobs or viewports.
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  This is a generic function with methods for grobs (including
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  This is a generic function with methods for grobs (including
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  gTrees) and viewports (including \I{vpTree}s).
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  \I{gTree}s) and viewports (including \I{vpTree}s).
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}
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}
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\usage{
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\usage{
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grid.ls(x=NULL, grobs=TRUE, viewports=FALSE, fullNames=FALSE,
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grid.ls(x=NULL, grobs=TRUE, viewports=FALSE, fullNames=FALSE,
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        recursive=TRUE, print=TRUE, flatten=TRUE, ...)
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        recursive=TRUE, print=TRUE, flatten=TRUE, ...)
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  Otherwise, \code{x} should be a grob or a viewport.
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  Otherwise, \code{x} should be a grob or a viewport.
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  The default behaviour of this function is to print information
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  The default behaviour of this function is to print information
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  about the grobs in the current scene.  It is also possible to
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  about the grobs in the current scene.  It is also possible to
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  add information about the viewports in the scene.  By default,
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  add information about the viewports in the scene.  By default,
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  the listing is recursive, so all children of gTrees and all
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  the listing is recursive, so all children of \I{gTree}s and all
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  nested viewports are reported.
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  nested viewports are reported.
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  The format of the information can be controlled via the \code{print}
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  The format of the information can be controlled via the \code{print}
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  argument, which can be given a function to perform the formatting.
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  argument, which can be given a function to perform the formatting.
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  The \code{nestedListing} function produces a line per grob or
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  The \code{nestedListing} function produces a line per grob or