QMLBridges: Expose Signals

class FileDownloaderModel:
    def __init__(self):
        super().__init__()

    def download_file(self, url: str) -> None:
        print(f"Downloading {url}")
        # this call onDownloadCompleted in QML
        emit_signal("downloadCompleted", url) #infer type from Url or use QVariant

downlaoder = FileDownloaderModel()
AutoQmlBridge(downloader, data_type="List")

import QtQuick 2.15
import QtQuick.Controls 2.15
import backend 1.0

ApplicationWindow {
    ...

    Connections {
        target: FileDownloaderModel
        onDownloadCompleted: {
            console.log("Download completed for: " + url)
        }
    }
}