wxPython/samples/wxPIA_book/Chapter-10/update_ui.py

   1 import wx
   2
   3 ID_SIMPLE = wx.NewId()
   4
   5 class MyFrame(wx.Frame):
   6     def __init__(self):
   7         wx.Frame.__init__(self, None, -1,
   8                           "UPDATE_UI Menu Example")
   9         p = wx.Panel(self)
  10         self.btn = wx.Button(p, -1, "Disable Item", (20,20))
  11         self.Bind(wx.EVT_BUTTON, self.OnToggleItem, self.btn)
  12
  13         menu = wx.Menu()
  14         menu.Append(ID_SIMPLE, "Simple menu item")
  15         self.enabled = True
  16         self.Bind(wx.EVT_MENU, self.OnSimple, id=ID_SIMPLE)
  17         self.Bind(wx.EVT_UPDATE_UI, self.OnUpdateSimple, id=ID_SIMPLE)
  18
  19         menu.AppendSeparator()
  20         menu.Append(wx.ID_EXIT, "Exit")
  21         self.Bind(wx.EVT_MENU, self.OnExit, id=wx.ID_EXIT)
  22
  23         menuBar = wx.MenuBar()
  24         menuBar.Append(menu, "Menu")
  25         self.SetMenuBar(menuBar)
  26
  27
  28     def OnSimple(self, event):
  29         wx.MessageBox("You selected the simple menu item")
  30
  31     def OnExit(self, event):
  32         self.Close()
  33
  34     def OnToggleItem(self, event):
  35         self.btn.SetLabel(
  36             (self.enabled and "Enable" or "Disable") + " Item")
  37         self.enabled = not self.enabled
  38
  39     def OnUpdateSimple(self, event):
  40         event.Enable(self.enabled)
  41
  42
  43 if __name__ == "__main__":
  44     app = wx.PySimpleApp()
  45     frame = MyFrame()
  46     frame.Show()
  47     app.MainLoop()
  48
  49