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#!/usr/bin/env python
"""
This demo attempts to override the C++ MainLoop and implement it
in Python.
"""
import time
import wx
#---------------------------------------------------------------------------
class MyFrame(wx.Frame):
def __init__(self, parent, id, title):
wx.Frame.__init__(self, parent, id, title,
(100, 100), (160, 150))
self.Bind(wx.EVT_SIZE, self.OnSize)
self.Bind(wx.EVT_MOVE, self.OnMove)
self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
self.Bind(wx.EVT_IDLE, self.OnIdle)
self.count = 0
panel = wx.Panel(self)
sizer = wx.FlexGridSizer(cols=2, hgap=5, vgap=5)
self.sizeCtrl = wx.TextCtrl(panel, -1, "", style=wx.TE_READONLY)
sizer.Add(wx.StaticText(panel, -1, "Size:"))
sizer.Add(self.sizeCtrl)
self.posCtrl = wx.TextCtrl(panel, -1, "", style=wx.TE_READONLY)
sizer.Add(wx.StaticText(panel, -1, "Pos:"))
sizer.Add(self.posCtrl)
self.idleCtrl = wx.TextCtrl(panel, -1, "", style=wx.TE_READONLY)
sizer.Add(wx.StaticText(panel, -1, "Idle:"))
sizer.Add(self.idleCtrl)
border = wx.BoxSizer()
border.Add(sizer, 0, wx.ALL, 20)
panel.SetSizer(border)
def OnCloseWindow(self, event):
app.keepGoing = False
self.Destroy()
def OnIdle(self, event):
self.idleCtrl.SetValue(str(self.count))
self.count = self.count + 1
def OnSize(self, event):
size = event.GetSize()
self.sizeCtrl.SetValue("%s, %s" % (size.width, size.height))
event.Skip()
def OnMove(self, event):
pos = event.GetPosition()
self.posCtrl.SetValue("%s, %s" % (pos.x, pos.y))
#---------------------------------------------------------------------------
class MyApp(wx.App):
def MainLoop(self):
# Create an event loop and make it active. If you are
# only going to temporarily have a nested event loop then
# you should get a reference to the old one and set it as
# the active event loop when you are done with this one...
evtloop = wx.GUIEventLoop()
old = wx.EventLoop.GetActive()
wx.EventLoop.SetActive(evtloop)
# This outer loop determines when to exit the application,
# for this example we let the main frame reset this flag
# when it closes.
while self.keepGoing:
# At this point in the outer loop you could do
# whatever you implemented your own MainLoop for. It
# should be quick and non-blocking, otherwise your GUI
# will freeze.
# call_your_code_here()
# This inner loop will process any GUI events
# until there are no more waiting.
while evtloop.Pending():
evtloop.Dispatch()
# Send idle events to idle handlers. You may want to
# throttle this back a bit somehow so there is not too
# much CPU time spent in the idle handlers. For this
# example, I'll just snooze a little...
time.sleep(0.10)
evtloop.ProcessIdle()
wx.EventLoop.SetActive(old)
def OnInit(self):
frame = MyFrame(None, -1, "This is a test")
frame.Show(True)
self.SetTopWindow(frame)
self.keepGoing = True
return True
app = MyApp(False)
app.MainLoop()
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