wxPython/demo/Timer.py

   1 import  time
   2 import  wx
   3 import  wx.lib.scrolledpanel as sp
   4
   5 #----------------------------------------------------------------------
   6
   7
   8 header = """\
   9 This demo shows the various ways that wx.Timers can be used in your code.  Just
  10 select one of the buttons in the left column to start a timer in the indicated way,
  11 and watch the log window below for messages printed when the timer event or callback
  12 happens.  Clicking the corresponding button on the right will stop that timer.  Since
  13 timers are not owned by any other wx object you should hold on to a reference to the
  14 timer until you are completely finished with it. """
  15
  16 doc1 = """\
  17 Binding an event handler to the wx.EVT_TIMER event is the
  18 prefered way to use the wx.Timer class directly.  It makes
  19 handling timer events work just like normal window events.  You
  20 just need to specify the window that is to receive the event in
  21 the wx.Timer constructor.  If that window needs to be able to
  22 receive events from more than one timer then you can optionally
  23 specify an ID for the timer and the event binding.
  24 """
  25
  26
  27 doc2 = """\
  28 wx.CallLater is a convenience class for wx.Timer.  You just
  29 specify the timeout in milliseconds and a callable object, along
  30 with any args or keyword args you would like to be passed to your
  31 callable, and wx.CallLater takes care of the rest.  If you don't
  32 need to get the return value of the callable or to restart the
  33 timer then there is no need to hold a reference to this object.
  34 """
  35
  36
  37 doc3 = """\
  38 If you derive a class from wx.Timer and give it a Notify method
  39 then it will be called when the timer expires.
  40 """
  41
  42
  43 doc4 = """\
  44 wx.PyTimer is the old way (a kludge that goes back all the way to
  45 the first version of wxPython) to bind a timer directly to a
  46 callable.  You should migrate any code that uses this method to
  47 use EVT_TIMER instead as this may be deprecated in the future.
  48 """
  49
  50
  51 class TestPanel(sp.ScrolledPanel):
  52     def __init__(self, parent, log):
  53         self.log = log
  54         sp.ScrolledPanel.__init__(self, parent, -1)
  55
  56         outsideSizer = wx.BoxSizer(wx.VERTICAL)
  57
  58         text = wx.StaticText(self, -1, "wx.Timer", style=wx.ALIGN_CENTRE)
  59         text.SetFont(wx.Font(24, wx.SWISS, wx.NORMAL, wx.BOLD, False))
  60         text.SetSize(text.GetBestSize())
  61         text.SetForegroundColour(wx.BLUE)
  62         outsideSizer.Add(text, 0, wx.EXPAND|wx.ALL, 5)
  63         outsideSizer.Add(wx.StaticText(self, -1, header), 0, wx.ALIGN_CENTER|wx.ALL, 5)
  64         outsideSizer.Add(wx.StaticLine(self, -1), 0, wx.EXPAND)
  65         outsideSizer.Add((20,20))
  66
  67
  68         t1b1 = wx.Button(self, -1, "EVT_TIMER")
  69         t1b2 = wx.Button(self, -1, "stop timer")
  70         t1st = wx.StaticText(self, -1, doc1)
  71         t1b2.Disable()
  72         self.Bind(wx.EVT_BUTTON, self.OnTest1Start, t1b1)
  73         self.Bind(wx.EVT_BUTTON, self.OnTest1Stop,  t1b2)
  74
  75         # Bind all EVT_TIMER events to self.OnTest1Timer
  76         self.Bind(wx.EVT_TIMER, self.OnTest1Timer)
  77
  78
  79         t2b1 = wx.Button(self, -1, "wx.CallLater")
  80         t2b2 = wx.Button(self, -1, "stop timer")
  81         t2st = wx.StaticText(self, -1, doc2)
  82         t2b2.Disable()
  83         self.Bind(wx.EVT_BUTTON, self.OnTest2Start, t2b1)
  84         self.Bind(wx.EVT_BUTTON, self.OnTest2Stop,  t2b2)
  85
  86         t3b1 = wx.Button(self, -1, "self.Notify")
  87         t3b2 = wx.Button(self, -1, "stop timer")
  88         t3st = wx.StaticText(self, -1, doc3)
  89         t3b2.Disable()
  90         self.Bind(wx.EVT_BUTTON, self.OnTest3Start, t3b1)
  91         self.Bind(wx.EVT_BUTTON, self.OnTest3Stop,  t3b2)
  92
  93         t4b1 = wx.Button(self, -1, "wx.PyTimer")
  94         t4b2 = wx.Button(self, -1, "stop timer")
  95         t4st = wx.StaticText(self, -1, doc4)
  96         t4b2.Disable()
  97         self.Bind(wx.EVT_BUTTON, self.OnTest4Start, t4b1)
  98         self.Bind(wx.EVT_BUTTON, self.OnTest4Stop,  t4b2)
  99
 100
 101         self.t1b2 = t1b2
 102         self.t2b2 = t2b2
 103         self.t3b2 = t3b2
 104         self.t4b2 = t4b2
 105
 106         fgs = wx.FlexGridSizer(cols=3, hgap=10, vgap=10)
 107         fgs.Add(t1b1)
 108         fgs.Add(t1b2)
 109         fgs.Add(t1st)
 110
 111         fgs.Add(t2b1)
 112         fgs.Add(t2b2)
 113         fgs.Add(t2st)
 114
 115         fgs.Add(t3b1)
 116         fgs.Add(t3b2)
 117         fgs.Add(t3st)
 118
 119         fgs.Add(t4b1)
 120         fgs.Add(t4b2)
 121         fgs.Add(t4st)
 122
 123         outsideSizer.Add(fgs, 0, wx.ALIGN_CENTER|wx.ALL, 10)
 124         self.SetSizer(outsideSizer)
 125         self.SetupScrolling()
 126
 127
 128     # Test 1 shows how to use a timer to generate EVT_TIMER
 129     # events, by passing self to the wx.Timer constructor.  The
 130     # event is bound above to the OnTest1Timer method.
 131
 132     def OnTest1Start(self, evt):
 133         self.t1 = wx.Timer(self)
 134         self.t1.Start(1000)
 135         self.log.write("EVT_TIMER timer started\n")
 136         self.t1b2.Enable()
 137
 138     def OnTest1Stop(self, evt):
 139         self.t1.Stop()
 140         self.log.write("EVT_TIMER timer stoped\n")
 141         del self.t1
 142         self.t1b2.Disable()
 143
 144     def OnTest1Timer(self, evt):
 145         self.log.write("got EVT_TIMER event\n")
 146
 147
 148
 149     # Test 2 shows how to use the wx.CallLater class.
 150
 151     def OnTest2Start(self, evt):
 152         # Call OnTest2Timer one second in the future, passing some
 153         # optional arbitrary args.  There is no need to hold a
 154         # reference to this one, unless we want to manipulate or query
 155         # it later like we do in the two methods below
 156         self.t2 = wx.CallLater(1000, self.OnTest2Timer,
 157                                 'a', 'b', 'c', one=1, two=2)
 158         self.log.write("CallLater scheduled\n")
 159         self.t2b2.Enable()
 160
 161     def OnTest2Stop(self, evt):
 162         self.t2.Stop()
 163         self.log.write("CallLater stopped, last return value was: %s\n" %
 164                        repr(self.t2.GetResult()))
 165         del self.t2
 166         self.t2b2.Disable()
 167
 168     def OnTest2Timer(self, *args, **kw):
 169         self.log.write("CallLater called with args=%s, kwargs=%s\n" % (args, kw))
 170
 171         # Normally a FutureCall is one-shot, but we can make it
 172         # recurring just by calling Restart.  We can even use a
 173         # different timeout or pass differnt args this time.
 174         self.t2.Restart(1500, "restarted")
 175
 176         # The return value of this function is saved and can be
 177         # retrived later.  See OnTest2Stop above.
 178         return "This is my return value"
 179
 180
 181
 182     # Test 3 shows how to use a class derived from wx.Timer.  See
 183     # also the NotifyTimer class below.
 184
 185     def OnTest3Start(self, evt):
 186         self.t3 = NotifyTimer(self.log)
 187         self.t3.Start(1000)
 188         self.log.write("NotifyTimer timer started\n")
 189         self.t3b2.Enable()
 190
 191     def OnTest3Stop(self, evt):
 192         self.t3.Stop()
 193         self.log.write("NotifyTimer timer stoped\n")
 194         del self.t3
 195         self.t3b2.Disable()
 196
 197
 198
 199     # Test 4 shows the old way (a kludge that goes back all the
 200     # way to the first version of wxPython) to bind a timer
 201     # directly to a callable.  You should migrate any code that
 202     # uses this method to use EVT_TIMER instead as this may be
 203     # deprecated in the future.
 204     def OnTest4Start(self, evt):
 205         self.t4 = wx.PyTimer(self.OnTest4Timer)
 206         self.t4.Start(1000)
 207         self.log.write("wx.PyTimer timer started\n")
 208         self.t4b2.Enable()
 209
 210     def OnTest4Stop(self, evt):
 211         self.t4.Stop()
 212         self.log.write("wx.PyTimer timer stoped\n")
 213         del self.t4
 214         self.t4b2.Disable()
 215
 216     def OnTest4Timer(self):
 217         self.log.write("got wx.PyTimer event\n")
 218
 219
 220
 221 #----------------------------------------------------------------------
 222
 223
 224 # When deriving from wx.Timer you must provide a Notify method
 225 # that will be called when the timer expires.
 226 class NotifyTimer(wx.Timer):
 227     def __init__(self, log):
 228         wx.Timer.__init__(self)
 229         self.log = log
 230
 231     def Notify(self):
 232         self.log.write("got NotifyTimer event\n")
 233
 234
 235
 236 #----------------------------------------------------------------------
 237
 238 def runTest(frame, nb, log):
 239     win = TestPanel(nb, log)
 240     return win
 241
 242
 243 #----------------------------------------------------------------------
 244
 245 overview = """<html><body>
 246 <h2><center>wx.Timer</center></h2>
 247
 248 The wx.Timer class allows you to execute code at specified intervals
 249 from within the wxPython event loop. Timers can be one-shot or
 250 repeating.  This demo shows the principle method of using a timer
 251 (with events) as well as the convenient wx.FutureCall class.  Also
 252 there are two other usage patterns shown here that have been preserved
 253 for backwards compatibility.
 254
 255 </body></html>
 256 """
 257
 258
 259
 260 if __name__ == '__main__':
 261     import sys,os
 262     import run
 263     run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
 264
 265
 266
 267