Actually add palette group

sugar/graphics/palettegroup.py

@@ -0,0 +1,74 @@
+# Copyright (C) 2007 Red Hat, Inc.
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+import gobject
+
+_groups = {}
+
+def get_group(group_id):
+    if _groups.has_key(group_id):
+        group = _groups[group_id]
+    else:
+        group = Group()
+        _groups[group_id] = group
+
+    return group
+
+class Group(gobject.GObject):
+    __gsignals__ = {
+        'popup' : (gobject.SIGNAL_RUN_FIRST,
+                     gobject.TYPE_NONE, ([])),
+        'popdown' : (gobject.SIGNAL_RUN_FIRST,
+                     gobject.TYPE_NONE, ([]))
+    }
+    def __init__(self):
+        gobject.GObject.__init__(self)
+        self._up = False
+        self._palettes = []
+
+    def is_up(self):
+        return self._up
+
+    def add(self, palette):
+        self._palettes.append(palette)
+
+        sid = palette.connect('popup', self._palette_popup_cb)
+        palette.popup_sid = sid
+
+        sid = palette.connect('popdown', self._palette_popdown_cb)
+        palette.podown_sid = sid
+
+    def remove(self, palette):
+        self.disconnect(palette.popup_sid)
+        self.disconnect(palette.popdown_sid)
+
+        self._palettes.remove(palette)
+
+    def _palette_popup_cb(self, palette):
+        if not self._up:
+            self.emit('popup')
+            self._up = True
+
+    def _palette_popdown_cb(self, palette):
+        down = True
+        for palette in self._palettes:
+            if palette.is_up():
+                down = False
+
+        if down:
+            self._up = False
+            self.emit('popdown')