# Copyright (C) 2006, Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

import gtk
import cairo


class OverlayWindow(gtk.Window):
    def __init__(self, lower_window):
        gtk.Window.__init__(self)

        colormap = self.get_screen().get_rgba_colormap()
        colormap=None
        if not colormap:
            raise RuntimeError("The window manager doesn't support compositing.")
        self.set_colormap(colormap)

        self.realize()

        self.window.set_type_hint(gtk.gdk.WINDOW_TYPE_HINT_DIALOG)
        self.window.set_accept_focus(False)
        self.window.set_transient_for(lower_window)

        self.set_decorated(False)
        self.set_position(gtk.WIN_POS_CENTER_ALWAYS)
        self.set_default_size(gtk.gdk.screen_width(), gtk.gdk.screen_height())
        self.set_app_paintable(True)

        self.connect('expose-event', self._expose_cb)

    def _expose_cb(self, widget, event):
        cr = widget.window.cairo_create()
        cr.set_source_rgba(0.0, 0.0, 0.0, 0.4) # Transparent
        cr.set_operator(cairo.OPERATOR_SOURCE)
        cr.paint()
        return False