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Make row layout summary data frames for use during pagination

Source: R/generics.R
make_row_df.Rd

All relevant information about table rows (e.g. indentations) is summarized in a data.frame. This function works only on rtables and rlistings objects, and not on their print counterparts (like MatrixPrintForm).

Usage 

make_row_df(
  tt,
  colwidths = NULL,
  visible_only = TRUE,
  rownum = 0,
  indent = 0L,
  path = character(),
  incontent = FALSE,
  repr_ext = 0L,
  repr_inds = integer(),
  sibpos = NA_integer_,
  nsibs = NA_integer_,
  max_width = NULL,
  fontspec = font_spec(),
  col_gap = 3L
)

# S4 method for class 'MatrixPrintForm'
make_row_df(
  tt,
  colwidths = NULL,
  visible_only = TRUE,
  rownum = 0,
  indent = 0L,
  path = character(),
  incontent = FALSE,
  repr_ext = 0L,
  repr_inds = integer(),
  sibpos = NA_integer_,
  nsibs = NA_integer_,
  max_width = NULL,
  fontspec = font_spec(),
  col_gap = mf_colgap(tt) %||% 3L
)

Arguments

tt

(ANY)
object representing the table-like object to be summarized.

colwidths

(numeric)
internal detail, do not set manually.

visible_only

(flag)
should only visible aspects of the table structure be reflected in this summary. Defaults to TRUE. May not be supported by all methods.

rownum

(numeric(1))
internal detail, do not set manually.

indent

(integer(1))
internal detail, do not set manually.

path

(character)
path to the (sub)table represented by tt. Defaults to character().

incontent

(flag)
internal detail, do not set manually.

repr_ext

(integer(1))
internal detail, do not set manually.

repr_inds

(integer)
internal detail, do not set manually.

sibpos

(integer(1))
internal detail, do not set manually.

nsibs

(integer(1))
internal detail, do not set manually.

max_width

(numeric(1) or NULL)
maximum width for title/footer materials.

fontspec

(font_spec)
a font_spec object specifying the font information to use for calculating string widths and heights, as returned by font_spec().

col_gap

(numeric(1))
the gap to be assumed between columns, in number of spaces with font specified by fontspec.

Value

A data.frame of row/column-structure information used by the pagination machinery.

Details

When visible_only is TRUE (the default), methods should return a data.frame with exactly one row per visible row in the table-like object. This is useful when reasoning about how a table will print, but does not reflect the full pathing space of the structure (though the paths which are given will all work as is).

If supported, when visible_only is FALSE, every structural element of the table (in row-space) will be reflected in the returned data.frame, meaning the full pathing-space will be represented but some rows in the layout summary will not represent printed rows in the table as it is displayed.

Most arguments beyond tt and visible_only are present so that make_row_df methods can call make_row_df recursively and retain information, and should not be set during a top-level call.

Note

The technically present root tree node is excluded from the summary returned by both make_row_df and make_col_df (see relevant functions inrtables), as it is the row/column structure of tt and thus not useful for pathing or pagination.

Examples 

# Expected error with matrix_form. For real case examples consult {rtables} documentation
mf <- basic_matrix_form(iris)
# make_row_df(mf) # Use table obj instead