在没有 while 循环的情况下更新 wx.gauge [英] Updating the wx.gauge without while-loop

问题描述

这几天一直在想这个问题:

Have been wondering about this for days now:

我有一个像这样的基本 wxpython 程序:

I have a basic wxpython program like this:

from MyModule import *

class Form(wx.Panel):
  def __init__(self, parent, id):
    self.gauge = wx.Gauge(...)
    ...
  def ButtonClick(self, event):
    proc = LongProcess()
    while (LongProcess):
      self.gauge.SetValue(LongProcess.status)
      wx.Yield()

导入 MyModule.py:

which imports the MyModule.py:

from threading import *

class LongProcess(self):
  def __init__(self):
    Thread.__init__(self)
    self.start()
  def run(self):
    for i in range(100):
      Do_something()
      self.status = i  

正如预期的那样，这会根据 LongProcess.status 值更新仪表.但是 while 循环似乎并不合适，因为整个程序使用 100% cpu 负载，因为它会不断检查状态(并不奇怪，tho).有没有办法将状态发送回母程序"而无需每秒执行数百万次?

This updates the gauge according to the value LongProcess.status, as expected. But the while-loop doesn't seem appropriate as the whole program uses 100% cpu load because it continuously checks the status (not surprising, tho). Is there any way to send the status back to the "mother program" without doing that millions of times per second?

推荐答案

您可以实例化来自非 GUI 线程的自定义事件，然后 wx.PostEvent 将它们实例化回 GUI 线程.这是一个线程安全的操作.我的用例通常是这样工作的:

You can instantiate custom events from the non-GUI thread and wx.PostEvent them back to the GUI-thread. This is a thread-safe action. My use cases typically work like this:

• 启动工作线程 - 自定义事件启动操作"
• 开始处理
• 发布事件回更新进度'第 15000 行的第 435 行已解析'
• 等

然后我绑定自定义事件以更新对话框或 textctrl/log 或其他任何内容.这很容易做到.如果您愿意，我可以发布一些示例代码，该示例代码是我在解决这些问题时写的一个小测试用例.

Then I bind the custom event to update a dialog or textctrl/log or whatever. It's surprisingly easy to do. If you'd like I can post some sample code of a little test case I wrote a while back when I was figuring this stuff out.

--

好的，这是一些代码，首先是线程示例:

Okay here's some code, first the threading example:

#!usr/bin/env python

import wx
import threading
import Queue
import random
import time

TextEventType = wx.NewEventType()
EVT_THREAD_TEXT_EVENT = wx.PyEventBinder(TextEventType, 1)

global_queue = Queue.Queue()

def threadStart(numthrds, queue, window):
    for i in range(numthrds):
        i = TextThread(queue, window)

class TextThread(threading.Thread):
    def __init__(self, queue, output_window):
        threading.Thread.__init__(self)
        self.inqueue = queue
        self.output_window = output_window
        self.start()


    def run(self):
        word = self.inqueue.get()
        self.setName(word.upper())
        wait = random.randrange(1, 10)
        time.sleep(wait)
        msg = 'Thread: ' + self.getName() + '--wait= ' + str(wait) + ' ' + word
        evt = NewTextEvent(TextEventType, -1)
        evt.setText(msg)
        wx.PostEvent(self.output_window, evt) #post EVT_THREAD_TEXT_EVENT
        #self.inqueue.task_done() #may not need this if non-blocking



class NewTextEvent(wx.PyCommandEvent):
    def __init__(self, evtType, id):
        wx.PyCommandEvent.__init__(self, evtType, id)

        self.msg = ''

    def setText(self, text):
        self.msg = text

    def getText(self):
        return self.msg

class TextFrame(wx.Frame):
    def __init__(self, parent, id, *args, **kwargs):
        wx.Frame.__init__(self, parent, id, *args, **kwargs)
        self.queue = Queue.Queue()
        framesizer = wx.BoxSizer(wx.VERTICAL)
        self.panel = ThreadPanel(self, wx.ID_ANY)
        framesizer.Add(self.panel, 0, wx.EXPAND)
        self.SetSizerAndFit(framesizer)

        self.Bind(EVT_THREAD_TEXT_EVENT, self.OnThreadText)

    def OnThreadText(self, evt):
        msg = evt.getText()
        self.panel.out_tc.AppendText(msg + '\n')

class ThreadPanel(wx.Panel):
    def __init__(self, parent, id, *args, **kwargs):
        wx.Panel.__init__(self, parent, *args, **kwargs)
        vsizer = wx.BoxSizer(wx.VERTICAL)
        self.wordtc = wx.TextCtrl(self, id=wx.ID_ANY, value='', size=(350, -1))
        self.inst_text = wx.StaticText(self, wx.ID_ANY,
            label='Enter a list of space-separated words')
        self.out_tc = wx.TextCtrl(self, id=wx.ID_ANY, size=(350, 300), 
            value='', style=wx.TE_MULTILINE)
        self.start_button = wx.Button(self, wx.ID_ANY, label='Start Threads')

        vsizer.Add(self.inst_text, 0, wx.ALIGN_LEFT)
        vsizer.Add(self.wordtc, 0, wx.EXPAND)
        vsizer.Add(self.start_button)
        vsizer.Add((100,100))
        vsizer.Add(self.out_tc, 0, wx.EXPAND)
        self.SetSizer(vsizer)
        self.Bind(wx.EVT_BUTTON, self.OnStartButton, self.start_button)

    def OnStartButton(self, evt):
        self.out_tc.Clear()
        text = self.wordtc.GetValue()
        self.wordtc.Clear()
        if not text.count(','):
            text = text.split(' ')
        num_thrds = len(text)
        for word in text:
            word = word.strip()
            self.GetParent().queue.put(word)
        threadStart(num_thrds, self.GetParent().queue, self.GetParent())




if __name__ == "__main__":
    app = wx.App()
    frame = TextFrame(None, wx.ID_ANY, 'Thread test')
    frame.Show()    
    app.MainLoop()

第二个更简单的自定义事件示例:

And a second, more simple example with custom events:

#!usr/bin/env python

import wx
import random

colorEventType = wx.NewEventType()
EVT_COLOR_EVENT = wx.PyEventBinder(colorEventType, 1)

class ButtonPanel(wx.Panel):
    def __init__(self, parent, *args, **kwargs):
        wx.Panel.__init__(self, parent, *args, **kwargs)

        vsizer = wx.BoxSizer(wx.VERTICAL)
        self.rstbutt = wx.Button(self, wx.ID_ANY, label='Restore')
        self.rstbutt.Disable()
        self.Bind(wx.EVT_BUTTON, self.OnButt, self.rstbutt)
        vsizer.Add(self.rstbutt, 0, wx.ALIGN_CENTER)
        vsizer.Add((500,150), 0)
        self.SetSizer(vsizer)

    def OnButt(self, evt):
        self.SetBackgroundColour(wx.NullColor)
        self.GetParent().Refresh()
        self.rstbutt.Disable()

class ColorEvent(wx.PyCommandEvent):
    def __init__(self, evtType, id):
        wx.PyCommandEvent.__init__(self, evtType, id)
        self.color = None

    def SetMyColor(self, color):
        self.color = color

    def GetMyColor(self):
        return self.color

class MainFrame(wx.Frame):
    def __init__(self, parent, *args, **kwargs):
        wx.Frame.__init__(self, parent, *args, **kwargs)
        framesizer = wx.BoxSizer(wx.VERTICAL)
        self.panel = ButtonPanel(self, wx.ID_ANY)
        framesizer.Add(self.panel, 1, wx.EXPAND)

        menubar = wx.MenuBar()
        filemenu = wx.Menu()
        menuquit = filemenu.Append(wx.ID_ANY, '&Quit')
        menubar.Append(filemenu, 'File')
        colormenu = wx.Menu()
        switch = colormenu.Append(wx.ID_ANY, '&Switch Color')
        menubar.Append(colormenu, '&Color')
        self.SetMenuBar(menubar)

        self.Bind(wx.EVT_MENU, self.OnQuit, menuquit)
        self.Bind(wx.EVT_MENU, self.OnColor, switch)
        self.Bind(EVT_COLOR_EVENT, self.ColorSwitch)
        self.SetSizerAndFit(framesizer)

    def OnQuit(self, evt):
        self.Close()

    def OnColor(self, evt):
        colevt = ColorEvent(colorEventType, -1) 
        colors = ['red', 'green', 'blue', 'white', 'black', 'pink', 
            (106, 90, 205), #slate blue
            (64, 224, 208), #turquoise
            ]
        choice = random.choice(colors)
        colevt.SetMyColor(choice)
        self.GetEventHandler().ProcessEvent(colevt)
        #evt.Skip()

    def ColorSwitch(self, evt):
        color = evt.GetMyColor()
        #print(color)
        self.panel.SetBackgroundColour(color)
        self.Refresh()
        self.panel.rstbutt.Enable()



if __name__ == "__main__":
    app = wx.App()
    frame = MainFrame(None, wx.ID_ANY, title="Change Panel Color Custom Event")
    frame.Show(True)

    app.MainLoop()

这篇关于在没有 while 循环的情况下更新 wx.gauge的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！