Return text fields into which the text cannot be inserted completely

[thomasbaustert]

If a text field of a PDF template is filled with a text, it can happen that the text does not fit completely into the field.
It would be very helpful to be informed in which fields the text has not been inserted completely.

For now I tried the following:

def text_fits?(field)
  x_bottom_left, y_bottom_left, x_top_right, y_top_right = field[:Rect]
  field_height = y_top_right - y_bottom_left
  field_width = x_top_right - x_bottom_left

  _, font_size, = field.parse_default_appearance_string

  # prawn_document = Prawn::Document.new(...)
  text_width = prawn_document.width_of(field.field_value, size: font_size)

  (text_width - field_width < 0)
end

I use Prawn's method width_of to get the width of the text (based on the font and the font size).
If the text width is less then the text field width the texts fits.

When I look at the generated PDF, I see that if text_fits? returns true, the text is inserted completely. And if text_fits? returns false, the text cannot be inserted completely.

Do you think this is reliable way?
Is there a similar method like width_of in hexapdf?
Or is there a better way in hexapdf to achieve this?

For example, something similar to Prawn's formatted_text_box which returns the text that does not fit into the box:

# remaining = prawn_doc.formatted_text_box(text, ...)
remaining = (field.field_value = text)
if remaining.empty?
  puts "fits"
else
  puts "fits not, remaining=`#{remaining}`"
end

Thanks!

[gettalong]

There is currently no way to determine this in HexaPDF.

Due to the way your text_fits? method is implemented it will not work for all cases because e.g. the rectangle may be rotated, there may be a border, and Prawn's width_of method is not fully compatible with the way HexaPDF lays out text.

I will have a look at how to best provide that information.

[thomasbaustert]

Thanks for having a look into it!
The PDF templates are generated by us (by a client of mine to be precisely).
For now there is no rotation or border, just a simple text field. Maybe it makes a solution easier.