def set_alpha(alph=255):
    ''' does the hard work of setting the alpha for self.w, using win32gui and winxpgui.
    '''
    alph = int(alph) % 256
    try:
        if flauxtext.os.name == 'nt':
            style = flauxtext.win32gui.GetWindowLong(self.w.window.handle, -20)
            if (style & 0x80000) != 0x80000:
                style |= 0x80000
                flauxtext.win32gui.SetWindowLong(self.w.window.handle, -20, style)
            flauxtext.winxpgui.SetLayeredWindowAttributes(self.w.window.handle, 0, alph, 2)
        else:
            flauxtext.Popen('transset-df %f -i %d' % (alph / 256., self.w.window.xid))
        self.transparency = alph
    except Exception, e:
        print e

def dialog():
    ''' 
    '''
    d = self.mk_dialog("alpha", (flauxtext.gtk.STOCK_OK,1))
    s = flauxtext.gtk.HScale()
    d.vbox.pack_start(s)
    s.set_digits(0)
    s.set_increments(1, 10)
    s.set_range(1, 255)
    s.set_value(self.transparency);
    s.connect('value_changed', lambda s_=s: set_alpha(int(s.get_value())))
    d.run()

half = lambda: set_alpha(125)
full = lambda: set_alpha(255)

less = lambda x: set_alpha(self.transparency - int(x))
greater = lambda x: set_alpha(self.transparency + int(x))

def transparency(*a, **kw):
    ''' 
    '''
    if flauxtext.os.name == 'nt':
        try:
            flauxtext.imp0rt('win32gui', 'winxpgui')
        except:
            self.flash_info("you can't use transparency because you don't have win32all.", 2e4, 'no_win32all')
            return
    else:
        if not flauxtext.os.popen4('transset-df -h')[1].read().lower().startswith('usage'):
            self.flash_info("you can't use transparency because you don't have transset-df.", 2e4, 'no_transset')
            return
    a = [x for x in a if not isinstance(x, flauxtext.gtk.Action)]
    if isinstance(a[0], (int, long)):
        set_alpha(a[0])
    elif isinstance(a[0], (str, unicode)):
        eval(a[0])(*a[1:])