在wxPython中使用线程持续更新GUI的好方法是什么？

Question

我正在用Python 2.7和wxPython 3.0在Windows 7上开发一个图形界面应用程序。这个应用程序的界面需要不断更新，里面有很多面板，每个面板上都有一个 wx.StaticText。我需要持续更新这些 wx.StaticTexts。我考虑使用 threads（线程）。同时，我还在使用 pubsub 模块来和图形界面进行通信，以更新这些 wx.StaticTexts。一切都按我预期的那样工作。

问题：在我下面的代码中，创建了两个线程。这两个线程都能通过 wx.CallAfter() 来更新图形界面。如果我有100个面板需要更新，我是否需要为每个更新特定面板的线程创建100个类？我希望这些线程能够独立工作，不受其他线程的影响。有没有比这个更好的方法呢？

代码：请查看下面的示例代码，随便玩玩：

import wx
from wx.lib.pubsub import setupkwargs
from wx.lib.pubsub import pub
import time
from threading import Thread
import threading

class GUI(wx.Frame):
    def __init__(self, parent, id, title):
        screenWidth = 500
        screenHeight = 400
        screenSize = (screenWidth,screenHeight)
        wx.Frame.__init__(self, None, id, title, size=screenSize)
        self.locationFont = locationFont = wx.Font(12, wx.MODERN, wx.NORMAL, wx.BOLD)
        mainSizer = wx.BoxSizer(wx.VERTICAL)
        myPanelA = wx.Panel(self, style=wx.SIMPLE_BORDER)
        myPanelA.SetBackgroundColour('#C0FAE0')
        self.myTextA = wx.StaticText(myPanelA, -1, "I have a problem :( ")
        myPanelB = wx.Panel(self, style=wx.SIMPLE_BORDER)
        myPanelB.SetBackgroundColour('#C0FAFF')
        self.myTextB = wx.StaticText(myPanelB, -1, "Me too :( ")
        mainSizer.Add(myPanelA, 1, wx.EXPAND, 5)
        mainSizer.Add(myPanelB, 1, wx.EXPAND, 5)
        self.SetSizer(mainSizer)
        pub.subscribe(self.updatePanelA, 'Update-panelA')
        pub.subscribe(self.updatePanelB, 'Update-panelB')

    def updatePanelA(self, message):
        self.myTextA.SetLabel(message)

    def updatePanelB(self, message):
        self.myTextB.SetLabel(message)

class threadA(Thread):
    def __init__(self):
        Thread.__init__(self)
        self.start()
    def run(self):
        ObjA = updateGUI()
        ObjA.methodA()

class threadB(Thread):
    def __init__(self):
        Thread.__init__(self)
        self.start()
    def run(self):
        ObjB = updateGUI()
        ObjB.methodB()

class updateGUI():
    def methodA(self):
        while True:
            time.sleep(3)
            wx.CallAfter(pub.sendMessage, 'Update-panelA', message='Problem solved')
    def methodB(self):
        while True:
            time.sleep(5)
            wx.CallAfter(pub.sendMessage, 'Update-panelB', message='Mine too')

if __name__=='__main__':
    app = wx.App()
    frame = GUI(parent=None, id=-1, title="Problem Demo")
    frame.Show()
    threadA()
    threadB()
    app.MainLoop()

谢谢你的时间！

Answer 1

你可以定义一个私有的“selfUpdatePanel”，让它自己启动一个线程来更新它自己的文本框。这样写代码会更容易维护。

看看下面这个根据你的代码修改过的示例：

import wx
from wx.lib.pubsub import setupkwargs
from wx.lib.pubsub import pub
import time
from threading import Thread
import threading


class selfUpdatePanel(wx.Panel):
    def __init__(self, parent, mystyle, interval, topic, message):
        wx.Panel.__init__(self, parent, style = mystyle)
        pub.subscribe(self.updatePanel, topic)
        self.updateMsg = message
        self.textCtrl = None
        self.interval = interval
        self.topic = topic
        pub.subscribe(self.updatePanel, self.topic)

    def setTextCtrl(self,text):
        self.textCtrl = text

    def updatePanel(self):
        self.textCtrl.SetLabel(self.updateMsg)

    def threadMethod(self):
        while True:
            print "threadMethod"
            time.sleep(self.interval)
            wx.CallAfter(pub.sendMessage, self.topic)

    def startThread(self):
        self.thread = Thread(target=self.threadMethod)
        self.thread.start()


class GUI(wx.Frame):
    def __init__(self, parent, id, title):
        screenWidth = 500
        screenHeight = 400
        screenSize = (screenWidth,screenHeight)
        wx.Frame.__init__(self, None, id, title, size=screenSize)
        self.locationFont = locationFont = wx.Font(12, wx.MODERN, wx.NORMAL, wx.BOLD)
        mainSizer = wx.BoxSizer(wx.VERTICAL)
        #myPanelA = wx.Panel(self, style=wx.SIMPLE_BORDER)

        myPanelA = selfUpdatePanel(self, wx.SIMPLE_BORDER, 3, 'Update-panelA', 'Problem solved')
        myPanelA.SetBackgroundColour('#C0FAE0')
        self.myTextA = wx.StaticText(myPanelA, -1, "I have a problem :( ")
        myPanelA.setTextCtrl(self.myTextA)

        #myPanelB = wx.Panel(self, style=wx.SIMPLE_BORDER)
        myPanelB = selfUpdatePanel(self, wx.SIMPLE_BORDER, 5, 'Update-panelB', 'Mine too')
        myPanelB.SetBackgroundColour('#C0FAFF')
        self.myTextB = wx.StaticText(myPanelB, -1, "Me too :( ")
        myPanelB.setTextCtrl(self.myTextB)
        mainSizer.Add(myPanelA, 1, wx.EXPAND, 5)
        mainSizer.Add(myPanelB, 1, wx.EXPAND, 5)
        self.SetSizer(mainSizer)

        myPanelB.startThread()
        myPanelA.startThread()


if __name__=='__main__':
    app = wx.App()
    frame = GUI(parent=None, id=-1, title="Problem Demo")
    frame.Show()
    app.MainLoop()