[pitivi: 11/14] git add pitivi/sourcelist_undo.py

[Edward Hervey <edwardrv src gnome org>]

commit f9059dae6153f94baf7ab91b5255c4a58a89e165
Author: Alessandro Decina <alessandro d gmail com>
Date:   Wed Jun 24 11:21:47 2009 +0200

    git add pitivi/sourcelist_undo.py

 pitivi/sourcelist_undo.py |   79 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 79 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/sourcelist_undo.py b/pitivi/sourcelist_undo.py
new file mode 100644
index 0000000..b1ada4c
--- /dev/null
+++ b/pitivi/sourcelist_undo.py
@@ -0,0 +1,79 @@
+# PiTiVi , Non-linear video editor
+#
+#       pitivi/sourcelist_undo.py
+#
+# Copyright (c) 2009, Alessandro Decina <alessandro d gmail com>
+#
+# This program 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 2.1 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+from pitivi.undo import UndoableAction
+
+class SourceListSourceAddedAction(UndoableAction):
+    def __init__(self, sourcelist, source):
+        self.sourcelist = sourcelist
+        self.source = source
+
+    def undo(self):
+        self.sourcelist.removeUri(self.source.uri)
+        self._undone()
+
+    def do(self):
+        self.sourcelist.addFactory(self.source)
+        self._done()
+
+class SourceListSourceRemovedAction(UndoableAction):
+    def __init__(self, sourcelist, uri, source):
+        self.sourcelist = sourcelist
+        self.uri = uri
+        self.source = source
+
+    def undo(self):
+        self.sourcelist.addFactory(self.source.uri, self.source)
+        self._undone()
+
+    def do(self):
+        del self.sourcelist[self.source.uri]
+        self._done()
+
+class SourceListLogObserver(object):
+    def __init__(self, log):
+        self.log = log
+
+    def startObserving(self, sourcelist):
+        self._connectToSourcelist(sourcelist)
+
+    def stopObserving(self, sourcelist):
+        self._disconnectFromSourcelist(sourcelist)
+
+    def _connectToSourcelist(self, sourcelist):
+        sourcelist.connect("source-added", self._sourceAddedCb)
+        sourcelist.connect("source-removed", self._sourceRemovedCb)
+
+    def _disconnectFromSourcelist(self, sourcelist):
+        sourcelist.disconnect_by_func(self._sourceAddedCb)
+        sourcelist.disconnect_by_func(self._sourceRemovedCb)
+
+    def _sourceAddedCb(self, sourcelist, factory):
+        self.log.begin("add source")
+        action = SourceListSourceAddedAction(sourcelist, factory)
+        self.log.push(action)
+        self.log.commit()
+
+    def _sourceRemovedCb(self, sourcelist, uri, factory):
+        self.log.begin("remove source")
+        action = SourceListSourceRemovedAction(sourcelist, uri, factory)
+        self.log.push(action)
+        self.log.commit()