4665: Aborted transactions appear in the undo history

svn: r16697

src/gen/db/exceptions.py

@@ -54,6 +54,18 @@ class DbWriteFailure(Exception):
     def messages(self):
         return self.value, self.value2
     
+class DbTransactionCancel(Exception):
+    """
+    Error used to indicate that a transaction needs to be canceled,
+    for example becuase it is lengthy and the users requests so.
+    """
+    def __init__(self, value):
+        Exception.__init__(self)
+        self.value = value
+
+    def __str__(self):
+        return self.value
+
 class DbVersionError(Exception):
     """
     Error used to report that a file could not be read because it is written 

src/gui/views/tags.py

@@ -43,7 +43,7 @@ import gtk
 #-------------------------------------------------------------------------
 from gen.ggettext import sgettext as _
 from gen.lib import Tag
-from gen.db import DbTxn
+from gen.db import DbTxn, DbTransactionCancel
 from gui.dbguielement import DbGUIElement
 from ListModel import ListModel, NOSORT, COLOR, INTEGER
 import const
@@ -269,14 +269,16 @@ class Tags(DbGUIElement):
         pmon.add_op(status)
         tag = self.db.get_tag_from_handle(tag_handle)
         msg = _('Tag Selection (%s)') % tag.get_name()
+        try:
             with DbTxn(msg, self.db) as trans:
                 for object_handle in selected:
                     status.heartbeat()
                     if status.should_cancel():
-                    break
+                        raise DbTransactionCancel("User requests cancelation "
+                            "of the transaction.")
                     view.add_tag(trans, object_handle, tag_handle)
-            if status.was_cancelled():
+        except DbTransactionCancel:
-                self.db.transaction_abort(trans)
+            pass
         status.end()
 
 def cb_menu_position(menu, button):
@@ -325,9 +327,12 @@ class OrganizeTagsDialog(object):
                 break
 
         # Save changed priority values
+        try:
             with DbTxn(_('Change Tag Priority'), self.db) as trans:
                 if not self.__change_tag_priority(trans):
-                self.db.transaction_abort(trans)
+                    raise DbTransactionCancel("There was nothing to change.")
+        except DbTransactionCancel:
+            pass
 
         self.top.destroy()
 
@@ -505,21 +510,22 @@ class OrganizeTagsDialog(object):
             pmon.add_op(status)
 
             msg = _('Delete Tag (%s)') % tag_name
-            with DbTxn(_('Change Tag Priority'), self.db) as trans:
+            try:
+                with DbTxn(msg, self.db) as trans:
                     for classname, handle in links:
                         status.heartbeat()
                         if status.should_cancel():
-                        break
+                            raise DbTransactionCancel("User requests "
+                                "cancelation of the transaction.")
                         obj = fnc[classname][0](handle) # get from handle
                         obj.remove_tag(tag_handle)
                         fnc[classname][1](obj, trans) # commit
 
                     self.db.remove_tag(tag_handle, trans)
                     self.__change_tag_priority(trans)
-                if status.was_cancelled():
-                    self.db.transaction_abort(trans)
-                else:
                     store.remove(iter_)
+            except DbTransactionCancel:
+                pass
             status.end()
 
 #-------------------------------------------------------------------------