wxPython/samples/mainloop/mainloop.py

   1 #!/usr/bin/env python
   2
   3 """
   4 This demo attempts to override the C++ MainLoop and implement it
   5 in Python.
   6 """
   7
   8 import time
   9 import wx
  10
  11 #---------------------------------------------------------------------------
  12
  13 class MyFrame(wx.Frame):
  14
  15     def __init__(self, parent, id, title):
  16         wx.Frame.__init__(self, parent, id, title,
  17                          (100, 100), (160, 150))
  18
  19         self.Bind(wx.EVT_SIZE, self.OnSize)
  20         self.Bind(wx.EVT_MOVE, self.OnMove)
  21         self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
  22         self.Bind(wx.EVT_IDLE, self.OnIdle)
  23
  24         self.count = 0
  25
  26         panel = wx.Panel(self)
  27         sizer = wx.FlexGridSizer(cols=2, hgap=5, vgap=5)
  28
  29         self.sizeCtrl = wx.TextCtrl(panel, -1, "", style=wx.TE_READONLY)
  30         sizer.Add(wx.StaticText(panel, -1, "Size:"))
  31         sizer.Add(self.sizeCtrl)
  32
  33         self.posCtrl = wx.TextCtrl(panel, -1, "", style=wx.TE_READONLY)
  34         sizer.Add(wx.StaticText(panel, -1, "Pos:"))
  35         sizer.Add(self.posCtrl)
  36
  37         self.idleCtrl = wx.TextCtrl(panel, -1, "", style=wx.TE_READONLY)
  38         sizer.Add(wx.StaticText(panel, -1, "Idle:"))
  39         sizer.Add(self.idleCtrl)
  40
  41         border = wx.BoxSizer()
  42         border.Add(sizer, 0, wx.ALL, 20)
  43         panel.SetSizer(border)
  44
  45
  46     def OnCloseWindow(self, event):
  47         app.keepGoing = False
  48         self.Destroy()
  49
  50     def OnIdle(self, event):
  51         self.idleCtrl.SetValue(str(self.count))
  52         self.count = self.count + 1
  53
  54     def OnSize(self, event):
  55         size = event.GetSize()
  56         self.sizeCtrl.SetValue("%s, %s" % (size.width, size.height))
  57         event.Skip()
  58
  59     def OnMove(self, event):
  60         pos = event.GetPosition()
  61         self.posCtrl.SetValue("%s, %s" % (pos.x, pos.y))
  62
  63
  64
  65 #---------------------------------------------------------------------------
  66
  67 class MyApp(wx.App):
  68     def MainLoop(self):
  69
  70         if "wxMac" in wx.PlatformInfo:
  71             # TODO:  Does wxMac implement wxEventLoop yet???
  72             wx.App.MainLoop()
  73
  74         else:
  75             # Create an event loop and make it active.  If you are
  76             # only going to temporarily have a nested event loop then
  77             # you should get a reference to the old one and set it as
  78             # the active event loop when you are done with this one...
  79             evtloop = wx.EventLoop()
  80             old = wx.EventLoop.GetActive()
  81             wx.EventLoop.SetActive(evtloop)
  82
  83             # This outer loop determines when to exit the application,
  84             # for this example we let the main frame reset this flag
  85             # when it closes.
  86             while self.keepGoing:
  87                 # At this point in the outer loop you could do
  88                 # whatever you implemented your own MainLoop for.  It
  89                 # should be quick and non-blocking, otherwise your GUI
  90                 # will freeze.
  91
  92                 # call_your_code_here()
  93
  94
  95                 # This inner loop will process any GUI events
  96                 # until there are no more waiting.
  97                 while evtloop.Pending():
  98                     evtloop.Dispatch()
  99
 100                 # Send idle events to idle handlers.  You may want to
 101                 # throttle this back a bit somehow so there is not too
 102                 # much CPU time spent in the idle handlers.  For this
 103                 # example, I'll just snooze a little...
 104                 time.sleep(0.10)
 105                 self.ProcessIdle()
 106
 107             wx.EventLoop.SetActive(old)
 108
 109
 110
 111     def OnInit(self):
 112         frame = MyFrame(None, -1, "This is a test")
 113         frame.Show(True)
 114         self.SetTopWindow(frame)
 115
 116         self.keepGoing = True
 117         return True
 118
 119
 120 app = MyApp(False)
 121 app.MainLoop()
 122
 123
 124
 125
 126