generate pdf help

[Leocrydis]

Question

I was looking at the examples on the website and came across the generate pdf example. This was exactly what i was looking for, but came across the issue that the generate_pdf def wasn't working. looking back at the example i tried running it in native mode when i did the function would no longer work. my app is currently set to native mode and would like to keep it this way.

is there a fix or alternative that some one would happen to know?

#!/usr/bin/env python3
from io import BytesIO

import cairo

from nicegui import ui

def generate_svg() -> str:
   output = BytesIO()
   surface = cairo.SVGSurface(output, 300, 200)
   draw(surface)
   surface.finish()
   return output.getvalue().decode('utf-8')


def generate_pdf() -> bytes:
   output = BytesIO()
   surface = cairo.PDFSurface(output, 300, 200)
   draw(surface)
   surface.finish()
   return output.getvalue()

def draw(surface: cairo.Surface) -> None:
   context = cairo.Context(surface)
   context.select_font_face('Arial', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)
   context.set_font_size(20)
   context.move_to(10, 40)
   context.show_text(name.value)
   context.move_to(10, 80)
   context.show_text(email.value)

def update() -> None:
   preview.content = generate_svg()

with ui.row():
   with ui.column():
       name = ui.input('Name', placeholder='Enter your name', on_change=update)
       email = ui.input('E-Mail', placeholder='Enter your E-Mail address', on_change=update)
   preview = ui.html().classes('border-2 border-gray-500')
   update()
   ui.button('PDF', on_click=lambda: ui.download(generate_pdf(), 'output.pdf')).bind_visibility_from(name, 'value')

ui.run(native=True)