如何在wxPython线程中实现仪表跟随下载功能？

import wx
import threading
import time

class DownloadThread(threading.Thread):
    def __init__(self, gauge):
        threading.Thread.__init__(self)
        self.gauge = gauge
        self.stop_event = threading.Event()

    def run(self):
        for i in range(101):
            if self.stop_event.is_set():
                break
            time.sleep(0.1)  # 模拟下载延迟
            wx.CallAfter(self.gauge.SetValue, i)

    def stop(self):
        self.stop_event.set()

class MyFrame(wx.Frame):
    def __init__(self, parent, title):
        super(MyFrame, self).__init__(parent, title=title, size=(300, 200))
        
        panel = wx.Panel(self)
        self.gauge = wx.Gauge(panel, range=100, pos=(20, 20), size=(250, 25))
        
        start_button = wx.Button(panel, label="Start Download", pos=(20, 60))
        start_button.Bind(wx.EVT_BUTTON, self.on_start_download)
        
        stop_button = wx.Button(panel, label="Stop Download", pos=(150, 60))
        stop_button.Bind(wx.EVT_BUTTON, self.on_stop_download)
        
        self.download_thread = None

    def on_start_download(self, event):
        self.download_thread = DownloadThread(self.gauge)
        self.download_thread.start()

    def on_stop_download(self, event):
        if self.download_thread:
            self.download_thread.stop()
            self.download_thread.join()
            self.gauge.SetValue(0)

app = wx.App(False)
frame = MyFrame(None, "Download Gauge Example")
frame.Show(True)
app.MainLoop()