inconsistent radio button group behavior in Adobe Reader vs Brave browser PDF viewer

[boulderalf]

Description of the bug

radio button group behavior works as expected in Brave browser PDF viewer. ie., selecting one button unselects any other selected button. radio button group behavior does not work in Adobe Reader. ie., only one button in the group is ever selectable

How to reproduce the bug

You can run this code in a Google Collaboratory notebook (https://colab.research.google.com/drive/1iO56sRBo5yxhC_1pN4EyQmBKVKZu4Soq?usp=sharing)

Or you can run this snippet...

radio_width = radio_height = 12

doc = fitz.open()
page = doc.new_page()

for button_id in range(0,3):
  pos_x = 50 + button_id * 20
  pos_y = 50
  widget_rect = fitz.Rect(pos_x, pos_y,
                          pos_x + radio_width, pos_y + radio_height)

  # Create a new widget
  w = fitz.Widget()

  w.rect = widget_rect
  w.field_name = "some_group_name"
  w.text_color = (0, 0, 0)
  w.field_type = fitz.PDF_WIDGET_TYPE_RADIOBUTTON
  w.field_value = False 

  page.add_widget(w)
  page.draw_oval(w.rect,width=1)

pdf_file = "debug_radiobutton_group.pdf"
doc.save(pdf_file)
doc.close()

Compare radio button selectability in browser PDF viewer vs Adobe Acrobat.

PyMuPDF version

1.24.9

Operating system

Windows

Python version

3.10

[JorjMcKie]

While radio buttons can be created with PyMuPDF, radio button groups cannot. See the documentation here. We therefore cannot deal with potentially inconsistent behaviors in PDF viewers.