How do I specify to prawn to truncate table cell content?

Question

I'd like to instruct Prawn to truncate the contents of table cells instead of wrapping them.

I've tried setting the style as follows, but it has no effect:

options = {
  cell_style: {
    overflow: :truncate
  },
}
pdf.table(entries, options)

If there is no direct way to specify truncation, I need a workaround recipe.

Please consider the following:

• I cannot truncate the strings themselves, because the font is not fixed-width
• calculating the width of each string is acceptable, but I would also need a way to retrieve the column width.

Answer 1

A fixed height could be used, but only if the height of the text is fixed. Only the first line of the text will be printed.

Example:

pdf.table(entries, :cell_style => {:height => 25})

Another option is to use a custom wrapper. Details are here:

https://github.com/prawnpdf/prawn/blob/master/lib/prawn/text/formatted/box.rb#L149

Example:

module MyWrap
  def wrap(array)
    initialize_wrap(array)
    @line_wrap.wrap_line(:document => @document,
                                  :kerning => @kerning,
                                  :width => available_width,
                                  :arranger => @arranger)
    if enough_height_for_this_line?
      move_baseline_down
      print_line
    end
    @text = @printed_lines.join("\n")
    @everything_printed = @arranger.finished?
    @arranger.unconsumed
  end
end

Prawn::Text::Formatted::Box.extensions << MyWrap

entries = [ ["very long text here", "another very long text here"] ]

Prawn::Document.generate("test.pdf") do
  table entries, :cell_style => { :inline_format => true }
end

I just copy the original wrap method and remove the while loop in order to print only the first line of the text.

Note that :inline_format => true must be used in order to get Prawn::Text::Formatted::Box working.

Answer 2

http://prawn.majesticseacreature.com/docs/0.11.1/Prawn/Text/Formatted.html

That has a way to truncate text in a box with

formatted_text_box(array, options={})

But it's not a table. I don't think there is any way to do it with a table, you'll have to use textboxes.