My code is below. The main focus would be on the OnStart method. I want
to make sure that a positive integer is entered in the input box. At
first I tried an if/else clause, then switched to try/except. Neither is
perfect yet, but I was wondering which I should try for in the first
place. I figure I need to check for an emptry string, non-numeric
strings (maybe these are the same check), 0 and negative numbers (which
might also fall into the category of 'anything but a number' because of
the negative sign).
Thanks.
-------------------------------
import wx
class MyTimer(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, wx.ID_ANY, 'Timer',
style=wx.DEFAULT_FRAME_STYLE ^
wx.RESIZE_BORDER ^ wx.MAXIMIZE_BOX)
panel = wx.Panel(self)
mainSizer = wx.BoxSizer(wx.VERTICAL)
inputSizer = wx.BoxSizer(wx.HORIZONTAL)
self.progress = wx.Gauge(panel, wx.ID_ANY, 100, size=(300, 20))
self.status = wx.StaticText(panel, wx.ID_ANY, 'Enter a time.')
prompt = wx.StaticText(panel, wx.ID_ANY, 'Time to wait:')
self.input = wx.TextCtrl(panel, wx.ID_ANY, size=(20, 20))
self.start = wx.Button(panel, wx.ID_ANY, 'Start')
self.reset = wx.Button(panel, wx.ID_ANY, 'Reset')
self.reset.Disable()
self.timer = wx.Timer(self)
mainSizer.Add(self.progress, flag=wx.ALIGN_CENTER | wx.ALL ^
wx.BOTTOM,
border=10)
mainSizer.Add(self.status, flag=wx.ALIGN_CENTER | wx.ALL,
border=10)
mainSizer.Add(inputSizer, flag=wx.ALIGN_CENTER | wx.BOTTOM,
border=10)
inputSizer.Add(prompt, flag=wx.ALIGN_CENTER)
inputSizer.Add(self.input, flag=wx.ALIGN_CENTER | wx.LEFT |
wx.RIGHT,
border=5)
inputSizer.Add(self.start, flag=wx.ALIGN_CENTER)
inputSizer.Add(self.reset, flag=wx.ALIGN_CENTER)
self.Bind(wx.EVT_TEXT_ENTER, self.OnStart, self.input)
self.Bind(wx.EVT_BUTTON, self.OnStart, self.start)
self.Bind(wx.EVT_TIMER, self.OnTimer, self.timer)
self.Bind(wx.EVT_BUTTON, self.OnReset, self.reset)
panel.SetSizer(mainSizer)
mainSizer.Fit(self)
def OnStart(self, event):
try:
self.time = int(self.input.GetValue())
self.minutes_passed = 1
self.minutes_remaining = self.time - 1
self.start.Disable()
self.input.Disable()
self.reset.Enable()
self.status.SetLabel('%s minute(s) remaining.' % self.time)
self.timer.Start(1000)
except ValueError:
wx.MessageBox('Enter a valid time.', 'Invalid time entered',
wx.OK | wx.ICON_ERROR)
self.input.Clear()
def OnReset(self, event):
if self.timer.IsRunning():
self.timer.Stop()
self.input.Clear()
self.input.Enable()
self.start.Enable()
self.reset.Disable()
self.status.SetLabel('Enter a new time.')
self.progress.SetValue(0)
self.minutes_passed = 1
def OnTimer(self, event):
if self.minutes_remaining != 0:
self.progress.SetValue(self.minutes_passed * (100.0 /
self.time))
self.status.SetLabel('%s minute(s) remaining.' %
self.minutes_remaining)
self.minutes_passed += 1
self.minutes_remaining -= 1
else:
self.timer.Stop()
self.progress.SetValue(self.minutes_passed * (100.0 /
self.time))
self.status.SetLabel('%s minute(s) have elapsed.' % self.time)
wx.Sound.Play(wx.Sound(r'C:\Windows\Media\notify.wav'))
class MyApp(wx.App):
def OnInit(self):
frame = MyTimer()
self.SetTopWindow(frame)
frame.Show()
return True
if __name__ == '__main__':
app = MyApp(False)
app.MainLoop()
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