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-10/update_ui.py

@@ -0,0 +1,49 @@
+import wx
+
+ID_SIMPLE = wx.NewId()
+
+class MyFrame(wx.Frame):
+    def __init__(self):
+        wx.Frame.__init__(self, None, -1,
+                          "UPDATE_UI Menu Example")
+        p = wx.Panel(self)
+        self.btn = wx.Button(p, -1, "Disable Item", (20,20))
+        self.Bind(wx.EVT_BUTTON, self.OnToggleItem, self.btn)
+        
+        menu = wx.Menu()
+        menu.Append(ID_SIMPLE, "Simple menu item")
+        self.enabled = True
+        self.Bind(wx.EVT_MENU, self.OnSimple, id=ID_SIMPLE)
+        self.Bind(wx.EVT_UPDATE_UI, self.OnUpdateSimple, id=ID_SIMPLE)
+        
+        menu.AppendSeparator()
+        menu.Append(wx.ID_EXIT, "Exit")
+        self.Bind(wx.EVT_MENU, self.OnExit, id=wx.ID_EXIT)
+                  
+        menuBar = wx.MenuBar()
+        menuBar.Append(menu, "Menu")
+        self.SetMenuBar(menuBar)
+
+        
+    def OnSimple(self, event):
+        wx.MessageBox("You selected the simple menu item")
+
+    def OnExit(self, event):
+        self.Close()
+
+    def OnToggleItem(self, event):
+        self.btn.SetLabel(
+            (self.enabled and "Enable" or "Disable") + " Item")
+        self.enabled = not self.enabled
+
+    def OnUpdateSimple(self, event):
+        event.Enable(self.enabled)
+        
+
+if __name__ == "__main__":
+    app = wx.PySimpleApp()
+    frame = MyFrame()
+    frame.Show()
+    app.MainLoop()
+
+