rq_async

example code

import sys

import requests
from PyQt5.QtWidgets import QApplication, QMainWindow, QVBoxLayout, QWidget

from pyreaqtive import RQList, RQComboBox, RQChoice, RQAsync, RQText, RQLabel


def get_authors():
    res = requests.get(f"https://poetrydb.org/authors")
    return [Author(name) for name in res.json()['authors']]


class Author:

    def __init__(self, name):
        self.name = name

    def get_author_titles(self):
        res = requests.get(f"https://poetrydb.org/author/{self.name}/title")
        return [Title(title['title'], of_author=self) for title in res.json()]

    def __str__(self):
        return self.name


class Title:

    def __init__(self, name, of_author: Author):
        self.name = name
        self.of_author = of_author

    def get_text(self):
        res = requests.get(f"https://poetrydb.org/title/{self.name}/author,lines")

        for title in res.json():
            if title['author'] == self.of_author.name:
                return '\n'.join(title['lines'])

        raise ValueError

    def __str__(self):
        return self.name


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        widget = QWidget()
        layout = QVBoxLayout()
        widget.setLayout(layout)
        self.setCentralWidget(widget)

        # Author
        self.author_list = RQList()

        self.get_author_list_task = RQAsync(
            task=lambda: self.author_list.set(get_authors()),
            trigger=RQAsync.AutoTriggers.START
        )

        self.author_selection = RQChoice(self.author_list, allow_none=True)

        self.author_combobox = RQComboBox(self.author_selection, rq_disabled=self.get_author_list_task.working)
        layout.addWidget(self.author_combobox)

        # Title
        self.title_list = RQList()

        self.get_title_list_task = RQAsync(
            task=lambda: self.title_list.set(
                self.author_selection.selected.get_author_titles()) if self.author_selection.get() is not None else None,
            trigger=self.author_selection
        )

        self.title_selection = RQChoice(self.title_list, allow_none=True)

        self.title_combobox = RQComboBox(self.title_selection, rq_disabled=self.get_title_list_task.working)
        layout.addWidget(self.title_combobox)

        # Text
        self.text = RQText("")

        self.get_text_task = RQAsync(
            task=lambda: self.text.set(
                self.title_selection.selected.get_text() if self.title_selection.get() is not None else ""
            ),
            trigger=self.title_selection
        )

        self.text_display = RQLabel(self.text)
        layout.addWidget(self.text_display)


app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec()