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+"""Smartcard event observer.
+
+__author__ = "gemalto https://www.gemalto.com/"
+
+Copyright 2001-2012 gemalto
+Author: Jean-Daniel Aussel, mailto:jean-daniel.aussel@gemalto.com
+
+This file is part of pyscard.
+
+pyscard 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.
+
+pyscard 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 pyscard; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+"""
+
+
+class SimpleSCardAppEventObserver:
+    """This interface defines the event handlers
+    called by the SimpleSCardApp."""
+
+    def __init__(self):
+        self.selectedcard = None
+        self.selectedreader = None
+
+    # callbacks from SimpleCardAppFrame controls
+    def OnActivateCard(self, card):
+        """Called when a card is activated in the reader
+        tree control or toolbar."""
+        self.selectedcard = card
+
+    def OnActivateReader(self, reader):
+        """Called when a reader is activated in the reader
+        tree control or toolbar."""
+        self.selectedreader = reader
+
+    def OnDeactivateCard(self, card):
+        """Called when a card is deactivated in the reader
+        tree control or toolbar."""
+        pass
+
+    def OnDeselectCard(self, card):
+        """Called when a card is selected in the reader
+        tree control or toolbar."""
+        self.selectedcard = None
+
+    def OnSelectCard(self, card):
+        """Called when a card is selected in the reader
+        tree control or toolbar."""
+        self.selectedcard = card
+
+    def OnSelectReader(self, reader):
+        """Called when a reader is selected in the reader
+        tree control or toolbar."""
+        self.selectedreader = reader