OnPaint needs a device context created which binds the frame class and the device together. 
 If this isn't present, the OnPaint() function gets stuck in an infinite loop and never retu
rns control to the frame.  You must create a device context to draw on within each paint eve
nt function.
 
-M


From: ilovepython1978@hotmail.comTo: wxpython-users@lists.wxwidgets.orgDate: Sat, 10 May 200
8 22:28:50 +0800Subject: [wxpython-users] A newbie question about wx.PaintEvent


Hi, all.when I run the following codes, the result is not what I expected:------------------
-------------------------------------------import wxclass PaintEventFrame(wx.Frame):    def 
__init__(self,parent,id,title):        wx.Frame.__init__(self,parent,id,title)        self.p
anel=wx.Panel(self,-1)                self.count=0                self.panel.Bind(wx.EVT_PAI
NT,self.OnPaint)                self.Center()        self.Show(True)        def OnPaint(self
,event):        self.count=self.count+1  &nbs p;     print self.countif __name__=="__main__"
:    app=wx.App(False)    PaintEventFrame(None,-1,"PaintEvent Frame")    app.MainLoop()-----
---------------------------------------------------------------The printed result is increme
ntd from 1 to larger numbers continuously, why?But if I palce "dc=wx.PaintDC(self.panel)" in
to the "OnPaint" method, the result is what I expected, why?Best regards!---I love Python!--
----ilovepython1978---

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