[wxPython-users] Transparent Windows Redux

[Robin Dunn]

Kevin Watters wrote:
> Thanks to some code posted to this mailing list I've got transparent windows
> going on wxMSW with the help of the ctypes module.
> 
> Now I'm looking for the equivalents on wxMAC and wxGTK.  I know from googling
> that wxWindow::GetHandle() returns something called a ControlRef (which is just
> an integer) on wxMAC.  My knowledge of Carbon/Cocoa is nil, so I don't know the
> required call to set the window for that ControlRef's transparency.  I do have,
> however, PyObjC installed, so I know such calls are possible.

There is some code in PyAUI that uses ctypes on Mac OSX to do 
transparencies there too.

import ctypes
_carbon_dll = 
ctypes.cdll.LoadLibrary(r'/System/Frameworks/Carbon.framework/Carbon')

        handle = _carbon_dll.GetControlOwner(wnd.GetHandle())
        if amount == 0:
            amnt = float(0)
        else:
            amnt = float(amount)/255.0  #convert from the 0-255 amount 
to the float that Carbon wants
        _carbon_dll.SetWindowAlpha(handle, ctypes.c_float(amnt))


> Also, is there an easy approach for wxGTK to take as well? 

I'm looking for some solutions for GTK, but nothing real solid yet.


-- 
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!