[kupfer] Make Rescan async

[Ulrik Sverdrup <usverdrup src gnome org>]

commit 91cea5e05e051d2ca9d664191dea37f1e22337af
Author: Karol BÄ?dkowski <karol bedkowski gmail com>
Date:   Tue Apr 6 16:42:53 2010 +0200

    Make Rescan async

 kupfer/plugin/core/__init__.py |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)
---
diff --git a/kupfer/plugin/core/__init__.py b/kupfer/plugin/core/__init__.py
index 9291a2e..8db508f 100644
--- a/kupfer/plugin/core/__init__.py
+++ b/kupfer/plugin/core/__init__.py
@@ -20,6 +20,7 @@ from kupfer import objects
 from kupfer.obj.base import InvalidLeafError
 from kupfer import interface
 from kupfer import pretty
+from kupfer import task
 
 
 def _is_debug():
@@ -100,6 +101,15 @@ class CopyToClipboard (Action):
 		return "gtk-copy"
 
 
+class RescanActionTask(task.ThreadTask):
+	def __init__(self, source):
+		task.ThreadTask.__init__(self)
+		self.source = source
+
+	def thread_do(self):
+		self.source.get_leaves(force_update=True)
+
+
 class Rescan (Action):
 	"""A source action: Rescan a source!  """
 	rank_adjust = -5
@@ -110,10 +120,14 @@ class Rescan (Action):
 		if not leaf.has_content():
 			raise InvalidLeafError("Must have content")
 		source = leaf.content_source()
-		source.get_leaves(force_update=True)
+		return RescanActionTask(source)
+
+	def is_async(self):
+		return True
 
 	def get_description(self):
 		return _("Force reindex of this source")
+
 	def get_icon_name(self):
 		return "gtk-refresh"