--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/printrun-src/printrun/eventhandler.py	Wed Jan 20 10:15:13 2021 +0100
@@ -0,0 +1,126 @@
+# This file is part of the Printrun suite.
+#
+# Printrun is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Printrun 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Printrun.  If not, see <http://www.gnu.org/licenses/>.
+
+class PrinterEventHandler:
+    '''
+    Defines a skeletton of an event-handler for printer events. It
+    allows attaching to the printcore and will be triggered for
+    different events.
+    '''
+    def __init__(self):
+        '''
+        Constructor.
+        '''
+        pass
+    
+    def on_init(self):
+        '''
+        Called whenever a new printcore is initialized.
+        '''
+        pass
+    
+    def on_send(self, command, gline):
+        '''
+        Called on every command sent to the printer.
+        
+        @param command: The command to be sent.
+        @param gline: The parsed high-level command.
+        '''
+        pass
+    
+    def on_recv(self, line):
+        '''
+        Called on every line read from the printer.
+        
+        @param line: The data has been read from printer.
+        '''
+        pass
+    
+    
+    def on_connect(self):
+        '''
+        Called whenever printcore is connected.
+        '''
+        pass
+    
+    def on_disconnect(self):
+        '''
+        Called whenever printcore is disconnected.
+        '''
+        pass
+    
+    def on_error(self, error):
+        '''
+        Called whenever an error occurs.
+        
+        @param error: The error that has been triggered.
+        '''
+        pass
+    
+    def on_online(self):
+        '''
+        Called when printer got online.
+        '''
+        pass
+    
+    def on_temp(self, line):
+        '''
+        Called for temp, status, whatever.
+        
+        @param line: Line of data.
+        '''
+        pass
+    
+    def on_start(self, resume):
+        '''
+        Called when printing is started.
+        
+        @param resume: If true, the print is resumed.
+        '''
+        pass
+    
+    def on_end(self):
+        '''
+        Called when printing ends.
+        '''
+        pass
+    
+    def on_layerchange(self, layer):
+        '''
+        Called on layer changed.
+        
+        @param layer: The new layer.
+        '''
+        pass
+    
+    def on_preprintsend(self, gline, index, mainqueue):
+        '''
+        Called pre sending printing command.
+        
+        @param gline: Line to be send.
+        @param index: Index in the mainqueue.
+        @param mainqueue: The main queue of commands.
+        '''
+        pass
+    
+    def on_printsend(self, gline):
+        '''
+        Called whenever a line is sent to the printer.
+        
+        @param gline: The line send to the printer.
+        '''
+        pass
+        
+        
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