在wxPython中使用线程更新GUI中面板的标签

Question

等级：初级

我使用的是pythonv2.7和wxpythonv3.0，操作系统是windows7。在

我的GUI应用程序：在我的GUI应用程序中，我从服务器读取一些值，然后根据这些值的数量在GUI中创建面板。然后每个面板将以staticText的形式表示值。例如：如果我从服务器接收到1,2,3值，那么我创建3面板，每个面板分别显示1，2和3。到这里为止还不错。在

问题：我想每5秒检查一次服务器以获取值并相应地更新我的GUI ie。我必须更新面板上的staticText以显示更新的值。我不想添加新面板我只想更新旧面板中的值。在

例如：如果我检查服务器，如果服务器返回1，2，3作为值，那么我想创建3面板，分别显示1，2，3值。5秒钟后，当我再次检查服务器时，如果服务器给出4，5，6作为值，那么我只想更新旧面板上的这些值。这意味着现在面板将分别显示4，5，6，而不是1，2，3。我读了一些关于使用线程的教程和帖子，我也理解了一些基本的事实。不幸的是，我不知道如何把这个概念应用到我的问题上。 如果我能为我的这个特殊问题找到一个有效的例子，这样我就可以把同样的方法应用到我的应用程序的其余部分，那就太好了。在

代码：我为这个特定问题创建了一个简短的示例代码。class labelsA中的getLabels()和类labelsB中的{}通过生成一些随机值并在列表中返回它们来模拟服务器。然后，class labelA的getLabels()返回的值列表和class labelsB的{}返回的值列表分别由createPanels()A和{}来创建面板并显示这些值。白色背景的面板是panelA，黄色背景的面板是panelB。如果有人能教我如何使用线程来更新这两个面板的值而不冻结/阻塞我的GUI，那就太好了。在

下载：下面提供了示例代码，可以downloaded from here来避免标识问题。在

#!/usr/bin/env python

from random import randrange
import wx
import wx.lib.scrolledpanel

class GUI(wx.Frame):

    def __init__(self, parent, id, title):
        screenWidth = 800
        screenHeight = 450
        screenSize = (screenWidth, screenHeight)
        wx.Frame.__init__(self, None, id, title, size=screenSize)
        self.locationFont = locationFont = wx.Font(15, wx.MODERN, wx.NORMAL, wx.BOLD)
        mainSizer = wx.BoxSizer(wx.HORIZONTAL)
        panelSizer = wx.BoxSizer(wx.HORIZONTAL)
        self.sizerA = sizerA = wx.BoxSizer(wx.VERTICAL)
        self.panelA = panelA = wx.lib.scrolledpanel.ScrolledPanel(self, -1, style=wx.SIMPLE_BORDER)
        panelA.SetupScrolling()
        panelA.SetBackgroundColour('#FFFFFF')
        self.sizerB = sizerB = wx.BoxSizer(wx.VERTICAL)
        self.panelB = panelB = wx.lib.scrolledpanel.ScrolledPanel(self, -1, style=wx.SIMPLE_BORDER)
        panelB.SetupScrolling()
        panelB.SetBackgroundColour('#FFF000')
        panelA.SetSizer(sizerA)
        panelB.SetSizer(sizerB)
        mainSizer.Add(panelA, 15, wx.EXPAND|wx.ALL)
        mainSizer.Add(panelB, 15, wx.EXPAND|wx.ALL)
        self.SetSizer(mainSizer)
        self.createPanelsA()
        self.createPanelsB()

    def createPanelsA(self):
        k = 0
        labelObj = labelsA()
        locations = labelObj.getLabel()
        print locations
        for i in locations:
            sPanels = 'sPanel'+str(k)
            sPanels = wx.Panel(self.panelA)
            label = str(k+1)
            text = wx.StaticText(sPanels, -1, label)
            text.SetFont(self.locationFont)
            text.SetForegroundColour('#0101DF')
            self.sizerA.Add(sPanels, 0, wx.ALL, 5)
            self.sizerA.Add(wx.StaticLine(self.panelA), 0, wx.ALL|wx.EXPAND, 0)
            k += 1

    def createPanelsB(self):
        k = 0
        labelObj = labelsB()
        locations = labelObj.getLabel()
        print locations
        for i in locations:
            sPanels = 'sPanel'+str(k)
            sPanels = wx.Panel(self.panelB)
            label = str(k+1)
            text = wx.StaticText(sPanels, -1, label)
            text.SetFont(self.locationFont)
            text.SetForegroundColour('#0101DF')
            self.sizerB.Add(sPanels, 0, wx.ALL, 5)
            self.sizerB.Add(wx.StaticLine(self.panelB), 0, wx.ALL|wx.EXPAND, 0)
            k += 1
################################################
class labelsA():
    def getLabel(self):
        mylist =[]
        i = randrange(10)
        for k in range(1,i+1):
            mylist.append(k)
        return mylist
###############################################
class labelsB():
    def getLabel(self):
        mylist =[]
        i = randrange(10)
        for k in range(1,i+1):
            mylist.append(k)
        return mylist
###############################################

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

非常感谢您抽出时间。任何帮助都将不胜感激。在

Answer 1

这里演示了如何创建一个线程来每隔5秒从某个地方获取信息，还演示了如何根据需要创建statictext，以及如何更新它们。在

#!/usr/bin/env python

from random import randrange
import wx
import wx.lib.scrolledpanel

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

class GUI(wx.Frame):

    def __init__(self, parent, id, title):
        screenWidth = 800
        screenHeight = 450
        screenSize = (screenWidth, screenHeight)
        wx.Frame.__init__(self, None, id, title, size=screenSize)
        self.locationFont = locationFont = wx.Font(15, wx.MODERN, wx.NORMAL, wx.BOLD)
        mainSizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer = sizer = wx.BoxSizer(wx.VERTICAL)
        self.panel = panel = wx.lib.scrolledpanel.ScrolledPanel(self, -1, style=wx.SIMPLE_BORDER)
        panel.SetupScrolling()
        panel.SetBackgroundColour('#FFFFFF')
        panel.SetSizer(sizer)
        mainSizer.Add(panel, 15, wx.EXPAND|wx.ALL)
        self.SetSizer(mainSizer)

        self.text_labels = []  # Stores the labels where server data is displayed

        pub.subscribe(self.OnNewLabels, "NEW_LABELS")


    def OnNewLabels(self, labels):
        locations = labels
        print locations
        if len(self.text_labels) < len(labels):
            new_labels_needed = len(labels) - len(self.text_labels) 
            label = "(no data)"
            for i in range(new_labels_needed):
                sPanels = wx.Panel(self.panel)
                text = wx.StaticText(sPanels, -1, label)
                text.SetFont(self.locationFont)
                text.SetForegroundColour('#0101DF')
                self.sizer.Add(sPanels, 0, wx.ALL, 5)
                self.sizer.Add(wx.StaticLine(self.panel), 0, wx.ALL|wx.EXPAND, 0)
                self.text_labels.append(text)
            self.sizer.Layout()            
        k = 0
        for label in locations:
            self.text_labels[k].SetLabel(str(label))
            k=k+1


###############################
#
#

def InterfaceThread():
    while True:
        # get the info from the server
        mylist =[]
        i = randrange(10)
        for k in range(1,i+1):
            mylist.append(randrange(10))

        # Tell the GUI about them
        wx.CallAfter(pub.sendMessage, "NEW_LABELS", labels = mylist)
        time.sleep(5)


class ServerInterface():

    def __init__(self):
        interface_thread = threading.Thread(target = InterfaceThread, args = ()) 
        interface_thread.start()



#############
#

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

Answer 2

据我所知，这个问题早就有人回答了，同样的结果也可以用简单的方法来实现wx定时器.
使用上面提供的代码：

#!/usr/bin/python
# -*- coding: utf-8 -*-
import wx
import wx.lib.scrolledpanel
from random import randrange
class GUI(wx.Frame):

    def __init__(self, parent, id, title):
        screenWidth = 800
        screenHeight = 450
        screenSize = (screenWidth, screenHeight)
        wx.Frame.__init__(self, None, id, title, size=screenSize)
        self.locationFont = locationFont = wx.Font(15, wx.MODERN, wx.NORMAL, wx.BOLD)
        mainSizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer = sizer = wx.BoxSizer(wx.VERTICAL)
        self.panel = panel = wx.lib.scrolledpanel.ScrolledPanel(self, -1, style=wx.SIMPLE_BORDER)
        panel.SetupScrolling()
        panel.SetBackgroundColour('#FFFFFF')
        panel.SetSizer(sizer)
        mainSizer.Add(panel, 15, wx.EXPAND|wx.ALL)
        self.SetSizer(mainSizer)
        self.text_labels = []  # Stores the labels where server data is displayed
        self.timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.OnTimer, self.timer)
        self.timer.Start(5000)

    def OnNewLabels(self, labels):
        locations = labels
        print locations
        if len(self.text_labels) < len(labels):
            new_labels_needed = len(labels) - len(self.text_labels) 
            label = "(no data)"
            for i in range(new_labels_needed):
                sPanels = wx.Panel(self.panel)
                text = wx.StaticText(sPanels, -1, label)
                text.SetFont(self.locationFont)
                text.SetForegroundColour('#0101DF')
                self.sizer.Add(sPanels, 0, wx.ALL, 5)
                self.sizer.Add(wx.StaticLine(self.panel), 0, wx.ALL|wx.EXPAND, 0)
                self.text_labels.append(text)
            self.sizer.Layout()
        k = 0
        for label in locations:
            self.text_labels[k].SetLabel(str(label))
            k=k+1
        if len(self.text_labels) > len(labels):
            labels_not_needed = len(self.text_labels) - len(labels)
            for i in range(labels_not_needed):
                self.text_labels[k].SetLabel("-")
                k+=1

    def OnTimer(self, evt):
        # get the info from the server
        mylist =[]
        i = randrange(10)
        for k in range(1,i+1):
            mylist.append(randrange(10))
        self.OnNewLabels(mylist)

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