使用 eventsysytem 进度条无法正常工作

问题描述

我正在使用 python 和 tkinter 为其他同事编写某种 gui 工具。 我已经几乎完成了这个工具，最后我想为他们制作一个进度条，以便他们确认进度。 其概念是编写一个运行在另一个线程上的事件驱动系统（调用者事件管理器），一旦事件管理器检测到某种目标事件已经发送，它就会立即调用目标函数插入主线程的for循环。 这是我的示例代码：

from queue import Queue,Empty
from threading import *
from tkinter import *
import time
from tkinter import ttk

EVENT_TYPE_1 = "Count"
MAX_NUMBER = 10
CUR_NUMBER = 0

class event_manager:
    def __init__(self):
        self._eventQueue = Queue()
        self._thread = Thread(target=self.Run)
        self._handlers = {}
        self._active = False

    def Start(self):
        self._active = True
        self._thread.start()

    def Run(self):
        while self._active is True:
            try:
                event = self._eventQueue.get(block=True,timeout=1)
                self.Process(event)
            except Empty:
                pass

    def Process(self,event):
        if event.type in self._handlers:
            for handler in self._handlers[event.type]:
                handler()
        else:
            pass

    def Stop(self):
        self._active = False
        self._thread.join()

    def addEventListenter(self,type_,handler):
        try:
            handlerList = self._handlers[type_]

        except KeyError:
            handlerList = []
            self._handlers[type_] = handlerList

        if handler not in handlerList:
            handlerList.append(handler)

    def removeEventListenter(self,handler):
        try:
            handlerList = self._handlers[type_]
            if handler in handlerList:
                handlerList.remove(handler)
            if not handlerList:
                del self._handlers[type_]
        except KeyError:
            pass

    def sendEvent(self,event):
        self._eventQueue.put(event)


class Event:
    def __init__(self,event_event_name,cur_done_task,type_=None):  
        self.type = type_
        self._event_name = event_event_name
        self._curDoneTask = cur_done_task


class EventSource:
    def __init__(self,event_name,event_mgr,max_number,type):
        self._event_name = event_name
        self._event_manager = event_mgr
        self._type = type
        self._max_number = max_number

    def count(self):
        global CUR_NUMBER
        for i in range(self._max_number):
            CUR_NUMBER = i + 1
            print("************ main thread start：Now start process {} - count : {}".format(self._event_name,CUR_NUMBER))
            event = Event("test",CUR_NUMBER,type_=self._type)
            self._event_manager.sendEvent(event)
            time.sleep(1)

class GUIListener(Tk):
    def __init__(self):
        super(GUIListener,self).__init__()

        self.title("Progress GUI")
        self.geometry("1200x805+600+100")
        self.config(bg="#535353")
        self.resizable(True,True)

        self.progressBar = ttk.Progressbar(master=self,orient=HORIZONTAL,maximum=MAX_NUMBER,length=300)
        self.progressBar.pack()
        self.button = ttk.Button(self,text="Run",command=lambda: self.button_function(MAX_NUMBER))
        self.button.pack()

    def update_progress_value(self):
        print("************Sub thread start: detect progress bar value is Now...{}".format(self.progressBar['value']))
        self.progressBar['value'] = CUR_NUMBER
        self.progressBar.update_idletasks()
        print("************Sub thread start: update progress bar value to...{}".format(CUR_NUMBER))

    def button_function(self,max_number):
        es = EventSource("eventSource",eventMgr,EVENT_TYPE_1)
        es.count()

if __name__ == '__main__':
    gui = GUIListener()

    eventMgr = event_manager()
    eventMgr.addEventListenter(EVENT_TYPE_1,gui.update_progress_value)
    eventMgr.Start()

    gui.mainloop()

但是结果出乎我的意料，控制台直接给我

************ main thread start：Now start process eventSource - count : 1
************ main thread start：Now start process eventSource - count : 2
************ main thread start：Now start process eventSource - count : 3
************ main thread start：Now start process eventSource - count : 4
************ main thread start：Now start process eventSource - count : 5
************ main thread start：Now start process eventSource - count : 6
************ main thread start：Now start process eventSource - count : 7
************ main thread start：Now start process eventSource - count : 8
************ main thread start：Now start process eventSource - count : 9
************ main thread start：Now start process eventSource - count : 10
************Sub thread start: detect progress bar value is Now...0.0
************Sub thread start: update progress bar value to...10
************Sub thread start: detect progress bar value is Now...10
************Sub thread start: update progress bar value to...10
************Sub thread start: detect progress bar value is Now...10
************Sub thread start: update progress bar value to...10
************Sub thread start: detect progress bar value is Now...10
************Sub thread start: update progress bar value to...10
************Sub thread start: detect progress bar value is Now...10
************Sub thread start: update progress bar value to...10
************Sub thread start: detect progress bar value is Now...10
************Sub thread start: update progress bar value to...10
************Sub thread start: detect progress bar value is Now...10
************Sub thread start: update progress bar value to...10
************Sub thread start: detect progress bar value is Now...10
************Sub thread start: update progress bar value to...10
************Sub thread start: detect progress bar value is Now...10
************Sub thread start: update progress bar value to...10
************Sub thread start: detect progress bar value is Now...10
************Sub thread start: update progress bar value to...10

那么我的问题在哪里，我怎样才能得到这样的结果

************ main thread start：Now start process eventSource - count : 1
************Sub thread start: detect progress bar value is Now...0.0
************Sub thread start: update progress bar value to...1
************ main thread start：Now start process eventSource - count : 2
************Sub thread start: detect progress bar value is Now...1.0
************Sub thread start: update progress bar value to...2
************ main thread start：Now start process eventSource - count : 3
************Sub thread start: detect progress bar value is Now...2.0
************Sub thread start: update progress bar value to...3
...
etc

这个问题困扰了我大约一个星期，请帮助我。

解决方法

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