[kupfer: 6/38] commatrick: Multiple action dispatch

[Ulrik Sverdrup <usverdrup src gnome org>]

commit 62f24b49733dc21a04880610b825d8f881bb2581
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Thu Jan 14 23:06:52 2010 +0100

    commatrick: Multiple action dispatch

 kupfer/commandexec.py |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)
---
diff --git a/kupfer/commandexec.py b/kupfer/commandexec.py
index cb9e7f9..7e4d4e6 100644
--- a/kupfer/commandexec.py
+++ b/kupfer/commandexec.py
@@ -21,12 +21,31 @@ class ActionExecutionError (Exception):
 
 def activate_action(obj, action, iobj):
 	""" Activate @action in simplest manner """
+	if not _is_multiple(obj) and not _is_multiple(iobj):
+		return _activate_action_single(obj, action, iobj)
+	else:
+		return _activate_action_multiple(obj, action, iobj)
+
+def _activate_action_single(obj, action, iobj):
 	if action.requires_object():
 		ret = action.activate(obj, iobj)
 	else:
 		ret = action.activate(obj)
 	return ret
 
+def _activate_action_multiple(obj, action, iobj):
+	if not hasattr(action, "activate_multiple"):
+		ret = None
+		for leaf in _get_leaf_members(obj):
+			ret = _activate_action_single(leaf, action, iobj) or ret
+		return ret
+
+	if action.requires_object():
+		ret = action.activate_multiple(_get_leaf_members(obj), _get_leaf_members(iobj))
+	else:
+		ret = action.activate_multiple(_get_leaf_members(obj))
+	return ret
+
 def parse_action_result(action, ret):
 	"""Return result type for @action and return value @ret"""
 	def valid_result(ret):
@@ -120,6 +139,9 @@ gobject.signal_new("command-result", ActionExecutionContext,
 		gobject.SIGNAL_RUN_LAST,
 		gobject.TYPE_BOOLEAN, (gobject.TYPE_INT, gobject.TYPE_PYOBJECT))
 
+def _is_multiple(leaf):
+	return hasattr(leaf, "get_multiple_leaf_representation")
+
 def _get_leaf_members(leaf):
 	"""
 	Return an iterator to members of @leaf, if it is a multiple leaf