How do I Block Events in wxPython
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From: Wanderer on 9 Dec 2009 10:42 I have a wxPython program which does some calculations and displays the results. During these calculations if I click the mouse inside the dialog the program locks up. If I leave the dialog alone the process completes fine. I have tried running the function from a separate dialog with Show Modal and I have tried using SetEvtHandlerEnabled all to no avail. The program is long and occupies several files so I won't show the whole thing but here is the calculation part. How do I block events? def DoEfficiency(self): from time import sleep self.timer.Stop() TotalPower = 0 Counter = 0 for ang in range(1,89): self.tc_angle.SetValue(ang) height = int(self.eclwidth * 10) for hgt in range(0,height): self.tc_height.SetValue(float(hgt)/10.0) self.UpdateValues() self.Redraw() self.DrawRays() sPower = self.tc_power.GetValue() Power = sPower.split('%') TotalPower +=float(Power[0]) Counter +=1 sleep(0.1) efficiency = TotalPower/Counter self.tc_eff.SetLabel(str(round(efficiency,1))) self.timer.Start(10) # end DoEfficiency def OnEfficiency(self, event): self.tc_aangle.SetEvtHandlerEnabled(False) self.tc_angle.SetEvtHandlerEnabled(False) self.tc_calc_len.SetEvtHandlerEnabled(False) self.tc_cpclength.SetEvtHandlerEnabled(False) self.tc_cpcwidth.SetEvtHandlerEnabled(False) self.tc_det.SetEvtHandlerEnabled(False) self.tc_ecl.SetEvtHandlerEnabled(False) self.tc_eff.SetEvtHandlerEnabled(False) self.tc_gap1.SetEvtHandlerEnabled(False) self.tc_gap2.SetEvtHandlerEnabled(False) self.tc_height.SetEvtHandlerEnabled(False) self.tc_parab.SetEvtHandlerEnabled(False) self.tc_power.SetEvtHandlerEnabled(False) self.tc_refresh.SetEvtHandlerEnabled(False) self.tc_tlength.SetEvtHandlerEnabled(False) self.tc_twidth.SetEvtHandlerEnabled(False) self.tc_use_tir.SetEvtHandlerEnabled(False) self.SetEvtHandlerEnabled(False) dlf = CalcEfficiency(self,"CalcEfficiency",wx.DefaultPosition, (90,60)) self.tc_aangle.SetEvtHandlerEnabled(True) self.tc_angle.SetEvtHandlerEnabled(True) self.tc_calc_len.SetEvtHandlerEnabled(True) self.tc_cpclength.SetEvtHandlerEnabled(True) self.tc_cpcwidth.SetEvtHandlerEnabled(True) self.tc_det.SetEvtHandlerEnabled(True) self.tc_ecl.SetEvtHandlerEnabled(True) self.tc_eff.SetEvtHandlerEnabled(True) self.tc_gap1.SetEvtHandlerEnabled(True) self.tc_gap2.SetEvtHandlerEnabled(True) self.tc_height.SetEvtHandlerEnabled(True) self.tc_parab.SetEvtHandlerEnabled(True) self.tc_power.SetEvtHandlerEnabled(True) self.tc_refresh.SetEvtHandlerEnabled(True) self.tc_tlength.SetEvtHandlerEnabled(True) self.tc_twidth.SetEvtHandlerEnabled(True) self.tc_use_tir.SetEvtHandlerEnabled(True) self.SetEvtHandlerEnabled(True) # end MyInterface class CalcEfficiency(wx.Dialog): """ """ def __init__(self, parent, title, pos, size): self.parent = parent wx.Dialog.__init__(self,parent, -1, title, pos, size) self.runButton = wx.ToggleButton(self, ID_TOGGLE, "Start", wx.DefaultPosition, (70,30)) self.Bind(wx.EVT_TOGGLEBUTTON, self.OnToggle, id = ID_TOGGLE) self.ShowModal() self.Destroy() # end init def OnToggle(self, event): if self.runButton.GetValue(): self.runButton.SetLabel("WAIT") self.SetEvtHandlerEnabled(False) self.parent.DoEfficiency() self.SetEvtHandlerEnabled(True) else: self.Close() # end OnQuit # end CalcEfficiency if __name__ == '__main__': app = MyApp(False) app.MainLoop() # end main
From: zeph on 9 Dec 2009 11:42 The wxPython wiki actually has a page on dealing with long running tasks called from event handlers called (surprise surprise): http://wiki.wxpython.org/LongRunningTasks Hint: the second to last example on that page has the clearest example - using a worker thread object to do your DoEfficiency() function. I also don't think you want to disable so many event handlers, do you? Nothing will respond to inputs as long as that process is running (assuming you aren't running it in another thread.)
From: Philip Semanchuk on 9 Dec 2009 11:43 On Dec 9, 2009, at 10:42 AM, Wanderer wrote: > I have a wxPython program which does some calculations and displays > the results. During these calculations if I click the mouse inside the > dialog the program locks up. If I leave the dialog alone the process > completes fine. I have tried running the function from a separate > dialog with Show Modal and I have tried using SetEvtHandlerEnabled all > to no avail. The program is long and occupies several files so I won't > show the whole thing but here is the calculation part. How do I block > events? Hi Wanderer, I don't have a solution for you but I have three suggestions. First, your program shouldn't be locking up just because you clicked on it. IMO that's the real problem, and discarding events is just a band-aid to cover it up. Nevertheless, sometimes a band-aid is an appropriate solution and you're the best judge of that. Second, the wxPython mailing list would be a better place for this question. Third, if you can't seem to resolve the problem, try paring it down to a minimal example that reproduces the problem. It's difficult to offer suggestions when we can't see the whole code or try the sample code ourselves. Good luck Philip
From: r0g on 9 Dec 2009 11:48 Wanderer wrote: > I have a wxPython program which does some calculations and displays > the results. During these calculations if I click the mouse inside the > dialog the program locks up. If I leave the dialog alone the process > completes fine. If anything in your GUI app takes a non trivial length of time to execute you need to run it in either a thread or a separate process. http://linuxgazette.net/107/pai.html Roger
From: Wanderer on 9 Dec 2009 12:06
On Dec 9, 11:48 am, r0g <aioe....(a)technicalbloke.com> wrote: > Wanderer wrote: > > I have a wxPython program which does some calculations and displays > > the results. During these calculations if I click the mouse inside the > > dialog the program locks up. If I leave the dialog alone the process > > completes fine. > > If anything in your GUI app takes a non trivial length of time to > execute you need to run it in either a thread or a separate process. > > http://linuxgazette.net/107/pai.html > > Roger Thanks Everyone. I'll have to look over these wikis about threading. I decided to go another route and user a timer to perform the loops. That way the events can be processed normally. def DoEfficiency(self, event): ang = self.tc_angle.GetValue() hgt = self.tc_height.GetValue() hgt += 0.1 if hgt > self.eclwidth: hgt = 0 ang +=1 self.tc_angle.SetValue(ang) self.height = hgt self.tc_height.SetValue(hgt) self.tc_height.SetValue(hgt) self.UpdateValues() self.Redraw() self.DrawRays() sPower = self.tc_power.GetValue() Power = sPower.split('%') self.TotalPower +=float(Power[0]) self.Counter +=1 efficiency = self.TotalPower/self.Counter self.tc_eff.SetLabel(str(round(efficiency,1))) if ang > 89: self.efftimer.Stop() self.timer.Start(10) # end DoEfficiency def OnEfficiency(self, event): self.TotalPower = 0 self.Counter = 0 self.tc_angle.SetValue(1) self.tc_height.SetValue(0) self.timer.Stop() self.efftimer.Start(100) # end MyInterface Found another strange bug (Strange to me, anyway). int(0.8 * 10.0) = 7. Had to change the code to int(0.8 * 10.0 + 0.0001). |