wxPython/demo/demoMainLoop.py

   1 #!/usr/bin/env python
   2 #---------------------------------------------------------------------------
   3 """
   4 This demo attempts to override the C++ MainLoop and implement it
   5 in Python.  This is not part of the demo framework.
   6
   7
   8                 THIS FEATURE IS STILL EXPERIMENTAL...
   9 """
  10
  11
  12 import wx                  # This module uses the new wx namespace
  13 import time
  14
  15
  16 #---------------------------------------------------------------------------
  17
  18 class MyFrame(wx.Frame):
  19
  20     def __init__(self, parent, id, title):
  21         wx.Frame.__init__(self, parent, id, title,
  22                          wx.Point(100, 100), wx.Size(160, 150))
  23
  24         wx.EVT_SIZE(self, self.OnSize)
  25         wx.EVT_MOVE(self, self.OnMove)
  26         wx.EVT_CLOSE(self, self.OnCloseWindow)
  27         wx.EVT_IDLE(self, self.OnIdle)
  28
  29         self.count = 0
  30
  31         panel = wx.Panel(self, -1)
  32         wx.StaticText(panel, -1, "Size:",
  33                      wx.DLG_PNT(panel, wx.Point(4, 4)),  wx.DefaultSize)
  34         wx.StaticText(panel, -1, "Pos:",
  35                      wx.DLG_PNT(panel, wx.Point(4, 16)), wx.DefaultSize)
  36
  37         wx.StaticText(panel, -1, "Idle:",
  38                      wx.DLG_PNT(panel, wx.Point(4, 28)), wx.DefaultSize)
  39
  40         self.sizeCtrl = wx.TextCtrl(panel, -1, "",
  41                                    wx.DLG_PNT(panel, wx.Point(24, 4)),
  42                                    wx.DLG_SZE(panel, wx.Size(36, -1)),
  43                                    wx.TE_READONLY)
  44
  45         self.posCtrl = wx.TextCtrl(panel, -1, "",
  46                                   wx.DLG_PNT(panel, wx.Point(24, 16)),
  47                                   wx.DLG_SZE(panel, wx.Size(36, -1)),
  48                                   wx.TE_READONLY)
  49
  50         self.idleCtrl = wx.TextCtrl(panel, -1, "",
  51                                    wx.DLG_PNT(panel, wx.Point(24, 28)),
  52                                    wx.DLG_SZE(panel, wx.Size(36, -1)),
  53                                    wx.TE_READONLY)
  54
  55
  56     def OnCloseWindow(self, event):
  57         app.keepGoing = False
  58         self.Destroy()
  59
  60     def OnIdle(self, event):
  61         self.idleCtrl.SetValue(str(self.count))
  62         self.count = self.count + 1
  63
  64     def OnSize(self, event):
  65         size = event.GetSize()
  66         self.sizeCtrl.SetValue("%s, %s" % (size.width, size.height))
  67         event.Skip()
  68
  69     def OnMove(self, event):
  70         pos = event.GetPosition()
  71         self.posCtrl.SetValue("%s, %s" % (pos.x, pos.y))
  72
  73
  74
  75 #---------------------------------------------------------------------------
  76
  77 class MyApp(wx.App):
  78     def MainLoop(self):
  79         # This outer loop determines when to exit the application,  for
  80         # this example we let the main frame reset this flag when it
  81         # closes.
  82         while self.keepGoing:
  83             # At this point in the outer loop you could do whatever you
  84             # implemented your own MainLoop for.  It should be quick and
  85             # non-blocking, otherwise your GUI will freeze.  For example,
  86             # call Fnorb's reactor.do_one_event(0), etc.
  87
  88             # call_your_code_here()
  89
  90
  91             # This inner loop will process any GUI events until there
  92             # are no more waiting.
  93             while self.Pending():
  94                 self.Dispatch()
  95
  96             # Send idle events to idle handlers.  You may want to throttle
  97             # this back a bit so there is not too much CPU time spent in
  98             # the idle handlers.  For this example, I'll just snooze a
  99             # little...
 100             time.sleep(0.25)
 101             self.ProcessIdle()
 102
 103
 104
 105     def OnInit(self):
 106         frame = MyFrame(None, -1, "This is a test")
 107         frame.Show(True)
 108         self.SetTopWindow(frame)
 109
 110         self.keepGoing = True
 111
 112         return True
 113
 114
 115 app = MyApp(0)
 116 app.MainLoop()
 117
 118
 119
 120
 121