wxPython/tests/test_transparentFrame.py

   1 import wx
   2
   3 class Frame(wx.Frame):
   4     def __init__(self):
   5         wx.Frame.__init__(self, None, title="Am I transparent?")
   6         self.amount = 255
   7         self.delta = -3
   8
   9         p = wx.Panel(self)
  10         self.st = wx.StaticText(p, -1, str(self.amount), (25,25))
  11         self.st.SetFont(wx.Font(18, wx.SWISS, wx.NORMAL, wx.NORMAL))
  12
  13         self.timer = wx.Timer(self)
  14         self.timer.Start(25)
  15         self.Bind(wx.EVT_TIMER, self.AlphaCycle)
  16
  17         self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
  18
  19
  20     def OnCloseWindow(self, evt):
  21         self.timer.Stop()
  22         del self.timer
  23         self.Destroy()
  24
  25
  26     def AlphaCycle(self, evt):
  27         self.amount += self.delta
  28         if self.amount == 0 or self.amount == 255:
  29             self.delta = -self.delta
  30         self.st.SetLabel(str(self.amount))
  31
  32         # Note that we no longer need to use ctypes or win32api to
  33         # make transparent windows, however I'm not removing the
  34         # MakeTransparent code from this sample as it may be helpful
  35         # for somebody someday.
  36         #self.MakeTransparent(self.amount)
  37
  38         # Instead we'll just call the SetTransparent method
  39         self.SetTransparent(self.amount)
  40
  41
  42     def MakeTransparent(self, amount):
  43         hwnd = self.GetHandle()
  44         try:
  45             import ctypes
  46             _winlib = ctypes.windll.user32
  47             style = _winlib.GetWindowLongA(hwnd, 0xffffffecL)
  48             style |= 0x00080000
  49             _winlib.SetWindowLongA(hwnd, 0xffffffecL, style)
  50             _winlib.SetLayeredWindowAttributes(hwnd, 0, amount, 2)
  51
  52         except ImportError:
  53             import win32api, win32con, winxpgui
  54             _winlib = win32api.LoadLibrary("user32")
  55             pSetLayeredWindowAttributes = win32api.GetProcAddress(
  56                 _winlib, "SetLayeredWindowAttributes")
  57             if pSetLayeredWindowAttributes == None:
  58                 return
  59             exstyle = win32api.GetWindowLong(hwnd, win32con.GWL_EXSTYLE)
  60             if 0 == (exstyle & 0x80000):
  61                 win32api.SetWindowLong(hwnd,
  62                                        win32con.GWL_EXSTYLE,
  63                                        exstyle | 0x80000)
  64             winxpgui.SetLayeredWindowAttributes(hwnd, 0, amount, 2)
  65
  66
  67
  68 app = wx.App(False)
  69 frm = Frame()
  70 frm.Show()
  71 app.MainLoop()