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from typing import Any, Callable, List, Optional, Tuple, TypeVar, cast
from queue import Empty, Queue
import threading
import time
from PySide6.QtCore import QTimer
from PySide6.QtWidgets import QDialog, QHBoxLayout, QLabel, QProgressBar, QVBoxLayout
from gui.gui.gui_common import ensure_qt_app
T = TypeVar("T")
StatusCallback = Callable[[str], None]
class _LoadingDialog(QDialog):
def __init__(self, title: str, initial_message: str) -> None:
super().__init__()
self.setWindowTitle(title)
self.setModal(True)
self.setFixedWidth(440)
layout = QVBoxLayout(self)
self._spinner_frames: List[str] = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"]
self._spinner_index = 0
spinner_row = QHBoxLayout()
self._spinner_label = QLabel(self._spinner_frames[0], self)
self._spinner_label.setStyleSheet("font-size: 20px; font-weight: 700; color: #8fd18f;")
spinner_row.addWidget(self._spinner_label)
self._message_label = QLabel(initial_message, self)
self._message_label.setWordWrap(True)
self._message_label.setStyleSheet("font-size: 13px;")
spinner_row.addWidget(self._message_label, 1)
layout.addLayout(spinner_row)
self._progress = QProgressBar(self)
self._progress.setRange(0, 0)
self._progress.setTextVisible(False)
layout.addWidget(self._progress)
self._hint_label = QLabel("Please wait…", self)
self._hint_label.setStyleSheet("font-size: 12px; color: #9aa0a6;")
layout.addWidget(self._hint_label)
self._spinner_timer = QTimer(self)
self._spinner_timer.setInterval(90)
self._spinner_timer.timeout.connect(self._tick_spinner)
self._spinner_timer.start()
def _tick_spinner(self) -> None:
self._spinner_index = (self._spinner_index + 1) % len(self._spinner_frames)
self._spinner_label.setText(self._spinner_frames[self._spinner_index])
def set_message(self, message: str) -> None:
self._message_label.setText(message)
def run_with_loading_popup(
title: str,
initial_message: str,
task: Callable[[StatusCallback], T],
) -> T:
app = ensure_qt_app()
dialog = _LoadingDialog(title=title, initial_message=initial_message)
events: Queue[Tuple[str, Any]] = Queue()
def publish_status(message: str) -> None:
events.put(("status", message))
def worker() -> None:
try:
result = task(publish_status)
events.put(("result", result))
except Exception as exc:
events.put(("error", exc))
thread = threading.Thread(target=worker, daemon=True)
thread.start()
dialog.show()
dialog.raise_()
dialog.activateWindow()
done = False
result_value: Optional[T] = None
error: Optional[Exception] = None
while not done:
app.processEvents()
while True:
try:
event_type, payload = events.get_nowait()
except Empty:
break
if event_type == "status":
dialog.set_message(str(payload))
elif event_type == "result":
result_value = cast(T, payload)
done = True
elif event_type == "error":
error = cast(Exception, payload)
done = True
if thread.is_alive() and not done:
time.sleep(0.03)
continue
if not thread.is_alive():
try:
event_type, payload = events.get_nowait()
if event_type == "status":
dialog.set_message(str(payload))
elif event_type == "result":
result_value = cast(T, payload)
elif event_type == "error":
error = cast(Exception, payload)
except Empty:
pass
done = True
dialog.close()
app.processEvents()
if error is not None:
raise error
return cast(T, result_value)
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