Added the sample code from wxPython In Action to the samples dir

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42925 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/samples/wxPIA_book/Chapter-18/timer.py

@@ -0,0 +1,39 @@
+import wx
+import time
+
+class ClockWindow(wx.Window):
+    def __init__(self, parent):
+        wx.Window.__init__(self, parent)
+        self.Bind(wx.EVT_PAINT, self.OnPaint)
+        self.timer = wx.Timer(self)
+        self.Bind(wx.EVT_TIMER, self.OnTimer, self.timer)
+        self.timer.Start(1000)
+
+    def Draw(self, dc):
+        t = time.localtime(time.time())
+        st = time.strftime("%I:%M:%S", t)
+        w, h = self.GetClientSize()
+        dc.SetBackground(wx.Brush(self.GetBackgroundColour()))
+        dc.Clear()
+        dc.SetFont(wx.Font(30, wx.SWISS, wx.NORMAL, wx.NORMAL))
+        tw, th = dc.GetTextExtent(st)
+        dc.DrawText(st, (w-tw)/2, (h)/2 - th/2)
+        
+    def OnTimer(self, evt):
+        dc = wx.BufferedDC(wx.ClientDC(self))
+        self.Draw(dc)
+
+    def OnPaint(self, evt):
+        dc = wx.BufferedPaintDC(self)
+        self.Draw(dc)
+
+class MyFrame(wx.Frame):
+    def __init__(self):
+        wx.Frame.__init__(self, None, title="wx.Timer")
+        ClockWindow(self)
+        
+
+app = wx.PySimpleApp()
+frm = MyFrame()
+frm.Show()
+app.MainLoop()