文章摘要
这篇文章介绍了使用Python的Tkinter库和tktt模块（可能是自定义或特定库）创建一个带有GUI界面的多线程程序。程序的主要功能是通过Queue和threading模块在主线程和工人线程之间通信，实现进度条的动态更新。文章详细描述了如何在主线程中启动一个 worker 线程来执行循环任务，每隔一定时间更新进度，并通过 listen_for_result 函数将结果传递回主界面。代码还展示了如何在 worker 线程结束后，根据进度条的状态动态地更新 UI 状态。总结来说，文章围绕使用Python多线程技术实现 GUI 界面中动态更新的典型应用场景进行了阐述。
import Tkinter as tk
from ttk import *
import time
import Queue, threading
class MainWindow:
def __init__(self):
self.root=tk.Tk()
self.root.title(‘Demo’)
def show(self):
self.progress=tk.IntVar()
self.progress_max=100
self.progressbar=Progressbar(self.root, mode=’determinate’, orient=tk.HORIZONTAL, variable=self.progress, maximum=self.progress_max)
self.progressbar.pack(fill=tk.BOTH, expand=True, padx=5, pady=5)
self.progress.set(0)
btn=tk.Button(self.root, text=’start’, command=self.start)
btn.pack(fill=tk.BOTH, expand=True, padx=15, pady=5)
self.btn=btn
self.root.mainloop()
def start(self):
self.progress.set(0)
self.btn.config(state=tk.DISABLED)
self.thread_queue=Queue.Queue() # used to communicate between main thread (UI) and worker thread
new_thread=threading.Thread(target=self.run_loop, kwargs={‘param1’:100, ‘param2′:20})
new_thread.start()
# schedule a time-task to check UI
# it’s in main thread, because it’s called by self.root
self.root.after(100, self.listen_for_result)
def run_loop(self, param1, param2):
progress=0
for entry in range(self.progress_max):
time.sleep(0.1)
progress=progress + 1
self.thread_queue.put(progress)
def listen_for_result(self):
”’
Check if there is something in the queue.
Must be invoked by self.root to be sure it’s running in main thread
”’
try:
progress=self.thread_queue.get(False)
self.progress.set(progress)
except Queue.Empty: # must exist to avoid trace-back
pass
finally:
if self.progress.get() < self.progressbar[‘maximum’]:
self.root.after(100, self.listen_for_result)
else:
self.btn.config(state=tk.NORMAL)
if __name__==’__main__’:
win=MainWindow()
win.show()