import threading

class AppState:
    def __init__(self):
        self.stop_event = threading.Event()
        self.is_running = False
        # 这些 UI 元素的引用将在 UI 初始化时被赋值
        self.progress_bar = None
        self.progress_label = None
        self.log_element = None

# 创建全局单例
app_state = AppState()