Running in native window

[Sitanggang]

How can I make program with PyWebIO running on native window instead on web browser? Is this feature available now?
I see this feature available in NiceGUI, which looks same webgui framework as PyWebIO.

...or maybe, just add an argument on start_server() giving option that program will run on webview windows instead on browser.

Thanks you.

[wang0618]

The native mode of NiceGUI is powered by pywebview. In pywebio, you can also use pywebview to run app in vative window. Here is a sample:

pip install pywebview

import webview
import threading
from pywebio.output import *
import asyncio
from pywebio import start_server


def main():
    put_info("Hello from PyWebIO")


def start_pywebio(port):
    # enable pywebio running in a thread
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)

    start_server(main, port=port, cdn=False)


if __name__ == '__main__':
    port = 8080
    threading.Thread(target=start_pywebio, args=(port,), daemon=True).start()
    window = webview.create_window(title='PyWebIO app', url=f'http://127.0.0.1:{port}')
    webview.start()

[Sitanggang]

Thanks @wang0618 for your response.

Yes, I already made some my own experiment too with PyWebIO and pywebview. Just by add import webview module and start prgram in server mode and not succeed in script mode. No need importing threading and asyncio because pywebview already reserve an argument for running thread. So, I have succeed modified some small part of your BMI demo program so that it looks like running on native desktop window into this:

# A simple script to calculate BMI
from pywebio.input import input, FLOAT
from pywebio.output import put_text
import webview # for displaying output to webview (destop mode)
import pywebio # starting pywebio web server
import os, signal # for terminating web server service

def bmi():
    height = input("Input your height(cm)：", type=FLOAT)
    weight = input("Input your weight(kg)：", type=FLOAT)

    BMI = weight / (height / 100) ** 2

    top_status = [(16, 'Severely underweight'), (18.5, 'Underweight'),
                  (25, 'Normal'), (30, 'Overweight'),
                  (35, 'Moderately obese'), (float('inf'), 'Severely obese')]

    for top, status in top_status:
        if BMI <= top:
            put_text('Your BMI: %.1f. Category: %s' % (BMI, status))
            break

# Modified part of BMI demo program (server mode):
if __name__ == '__main__':
    def start_webgui():
        pywebio.start_server(bmi, port=8080)
    
    window = webview.create_window('Opening PyWebView', 'http://localhost:8080')
    webview.start(start_webgui) #pywebio web server fired as thread

    print('Exitting...') 
    window.events.closing += os.kill(os.getpid(), signal.SIGTERM) #terminating server

I copy last line from your suggestion on another discussion about terminating web server. I don't know, but without it, the program never print 'Exitting...' on terminal/console after the window is closed. Mean that web server will not be automatically terminated without those last line.

Thanks for your tremendous work on PyWebIO.