This class represents a cell style in a Microsoft Excel
workbook. S4 objects of this class
and corresponding methods are used to manipulate cell styles. This includes setting data formats,
borders, background- and foreground-colors, etc.
Cell styles are created by calling the
createCellStyle method on a
Object of class
jobjRef (see package rJava) which represents a Java object reference that is used
in the back-end to manipulate the underlying Excel cell style instance.
XLConnect generally makes use of custom (named) cell styles. This allows users to more easily manage cell styles via Excel's cell style menu. For example, assuming you were using a specific custom cell style for your data table headers, you can change the header styling with a few clicks in Excel's cell style menu across all tables.
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Apply, create, or remove a cell style:
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# Load workbook (create if not existing) wb <- loadWorkbook("cellstyles.xlsx", create = TRUE) # We don't set a specific style action in this demo, so the # default 'XLConnect' will be used (XLC$"STYLE_ACTION.XLCONNECT") # Create a sheet named 'mtcars' createSheet(wb, name = "mtcars") # Create a named region called 'mtcars' referring to the sheet # called 'mtcars' createName(wb, name = "mtcars", formula = "mtcars!$C$4") # Write built-in data set 'mtcars' to the above defined named region. # This will use the default style action 'XLConnect'. writeNamedRegion(wb, mtcars, name = "mtcars") # Now let's color all weight cells of cars with a weight > 3.5 in red # (mtcars$wt > 3.5) # First, create a corresponding (named) cell style heavyCar <- createCellStyle(wb, name = "HeavyCar") # Specify the cell style to use a solid foreground color setFillPattern(heavyCar, fill = XLC$"FILL.SOLID_FOREGROUND") # Specify the foreground color to be used setFillForegroundColor(heavyCar, color = XLC$"COLOR.RED") # Which cars have a weight > 3.5 ? rowIndex <- which(mtcars$wt > 3.5) # NOTE: The mtcars data.frame has been written offset with top # left cell C4 - and we have also written a header row! # So, let's take that into account appropriately. Obviously, # the two steps could be combined directly into one ... rowIndex <- rowIndex + 4 # The same holds for the column index colIndex <- which(names(mtcars) == "wt") + 2 # Set the 'HeavyCar' cell style for the corresponding cells. # Note: the row and col arguments are vectorized! setCellStyle(wb, sheet = "mtcars", row = rowIndex, col = colIndex, cellstyle = heavyCar) # Save workbook (this actually writes the file to disk) saveWorkbook(wb)
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