34 lines
1.2 KiB
Python
34 lines
1.2 KiB
Python
"""Minimal bridge between Tkinter and an external asyncio loop."""
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import asyncio
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from typing import Callable
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class AsyncRunner:
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"""Run coroutines on a background loop and marshal results back to Tk."""
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def __init__(self, tk_root, loop: asyncio.AbstractEventLoop):
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"""Store the Tk root widget and the loop used for background work."""
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self.tk = tk_root
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self.loop = loop
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def run(self, awaitable, on_ok: Callable, on_err: Callable, busy=None, message: str | None = None):
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"""Schedule an awaitable and optionally show a busy indicator."""
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if busy:
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busy.show(message or "Lavoro in corso...")
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fut = asyncio.run_coroutine_threadsafe(awaitable, self.loop)
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self._poll(fut, on_ok, on_err, busy)
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def _poll(self, fut, on_ok, on_err, busy):
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"""Poll the future until completion and invoke the proper callback."""
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if fut.done():
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if busy:
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busy.hide()
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try:
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res = fut.result()
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on_ok(res)
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except Exception as ex:
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on_err(ex)
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return
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self.tk.after(50, lambda: self._poll(fut, on_ok, on_err, busy))
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