在tkinter中,我想创建以下内容:
当按下按钮foo时,函数foo立即开始运行。一个新窗口将弹出,并带有一个“取消”按钮,使用户可以中途终止过程(因为我的实际过程可能需要30分钟)。如果foo运行完成,则窗口将自行关闭并通知用户该过程已完成。
这是演示我的玩具问题的代码:
from tkinter import ttk, messagebox, Toplevel, Tk
import time
import multiprocessing
def foo():
for i in range(100):
print(i)
time.sleep(0.1)
class TerminatedProcess(Exception):
def __init__(self, str = "Process was terminated"):
self.error_str = str
class ProcessWindow(Toplevel):
def __init__(self, parent, process):
Toplevel.__init__(self, parent)
self.parent = parent
self. process = process
terminate_button = ttk.Button(self, text="Cancel", command=self.cancel)
terminate_button.grid(row=0, column=0)
self.grab_set() # so you can't push submit multiple times
def cancel(self):
self.process.terminate()
self.destroy()
raise TerminatedProcess
def launch(self):
self.process.start()
self.process.join()
self.destroy()
class MainApplication(ttk.Frame):
def __init__(self, parent, *args, **kwargs):
ttk.Frame.__init__(self, parent, *args, **kwargs)
self.parent = parent
self.button = ttk.Button(self, text = "foo", command = self.callback)
self.button.grid(row = 0, column = 0)
def callback(self):
try:
proc = multiprocessing.Process(target=foo)
process_window = ProcessWindow(self, proc)
process_window.launch()
except TerminatedProcess as e: # raised if foo is cancelled in other window
messagebox.showinfo(title="Cancelled", message=e.error_str)
else:
messagebox.showinfo(message="sucessful run", title="Finished")
def main():
root = Tk()
my_app = MainApplication(root, padding=(4))
my_app.grid(column=0, row=0)
root.mainloop()
if __name__ == '__main__':
main()
使用此代码,当按下按钮foo时,确实完成了process_window,因为函数foo运行了,并且我得到一个“运行成功”对话框,但是窗口从未弹出!这是一个问题,因为用户需要选择终止foo。有趣的是,如果删除process_window.launch(),我仍然会收到“运行成功”消息(如预期的那样),但process_window会显示出来。
我曾尝试将启动命令放入初始化中,但这也导致窗口不显示。
我还尝试如下所示在窗口声明之外启动该过程:
proc.start()
process_window = ProcessWindow(self, proc)
proc.join()
窗口仍然无法显示,但是进程运行了。
我的问题是,我需要如何安排这些片段来生成ProcessWindow并在ProcessWindow打开时自动启动进程?
更新(解决方法):我知道我可以在ProcessWindow中创建一个开始按钮来运行该功能(然后在按下一次按钮后将其禁用),但是我仍然想知道如何实现所描述的内容在原始问题中。
也许您正在寻找这样的东西:
from tkinter import ttk, messagebox, Toplevel, Tk
import time
import multiprocessing
def foo():
for i in range(100):
print(i)
time.sleep(0.1)
class ProcessWindow(Toplevel):
def __init__(self, parent, process):
Toplevel.__init__(self, parent)
self.parent = parent
self.process = process
terminate_button = ttk.Button(self, text="Cancel", command=self.cancel)
terminate_button.grid(row=0, column=0)
self.grab_set() # so you can't push submit multiple times
def cancel(self):
self.process.terminate()
self.destroy()
messagebox.showinfo(title="Cancelled", message='Process was terminated')
def launch(self):
self.process.start()
self.after(10, self.isAlive) # Starting the loop to check when the process is going to end
def isAlive(self):
if self.process.is_alive(): # Process still running
self.after(100, self.isAlive) # Going again...
elif self:
# Process finished
messagebox.showinfo(message="sucessful run", title="Finished")
self.destroy()
class MainApplication(ttk.Frame):
def __init__(self, parent, *args, **kwargs):
ttk.Frame.__init__(self, parent, *args, **kwargs)
self.parent = parent
self.button = ttk.Button(self, text = "foo", command = self.callback)
self.button.grid(row = 0, column = 0)
def callback(self):
proc = multiprocessing.Process(target=foo)
process_window = ProcessWindow(self, proc)
process_window.launch()
def main():
root = Tk()
my_app = MainApplication(root, padding=(4))
my_app.grid(column=0, row=0)
root.mainloop()
if __name__ == '__main__':
main()
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