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← API reference

Threading

pane.run(builder) builds the window on a dedicated UI (STA) thread and blocks the calling thread until the window closes. Build your widget tree inside builder - or inside a callback that's already running on the UI thread (any on_click/on_change/etc. fires there automatically).

To touch the UI later from another thread (a timer, a background task, an API response), marshal back with pane.invoke(fn):

import threading

def build(window):
    label = pane.text("waiting...")
    window.Content = pane.stack(label, margin=20)

    def work():
        result = slow_computation()
        pane.invoke(lambda: setattr(label, "Text", result))

    threading.Thread(target=work, daemon=True).start()

pane.run(build)

pane.invoke() is safe to call from any thread, including the UI thread itself (it just runs fn() directly in that case) - so code that might run on either doesn't need to branch on pane.is_ui_thread() itself.

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