accessing button handlers in multiple python modules

import probe_screen

def get_handlers(halcomp,builder,useropts): return [HandlerClass(halcomp,builder,useropts)]

def get_handlers(halcomp,builder,useropts): return [ProbeScreenClass(halcomp,builder,useropts)]

on_button_released probe_screen.on_button_released ProbeScreenClass.on_button_released probe_screen.ProbeScreenClass.button_released

from gmoccapy import widgets

from gmoccapy import probe_screen

def load_handlers(usermod,halcomp,builder,useropts,gscreen): hdl_func = 'get_handlers' mod = object = None def add_handler(method, f): if method in handlers: handlers[method].append(f) else: handlers[method] = [f] handlers = {} for u in usermod: (directory,filename) = os.path.split(u) (basename,extension) = os.path.splitext(filename) if directory == '': directory = '.' if directory not in sys.path: sys.path.insert(0,directory) print _('adding import dir %s' % directory) try: mod = __import__(basename) except ImportError,msg: print ("module '%s' skipped - import error: %s" %(basename,msg)) continue print _("module '%s' imported OK" % mod.__name__) try: # look for functions for temp in ("periodic","connect_signals","initialize_widgets"): h = getattr(mod,temp,None) if h and callable(h): print ("module '%s' : '%s' function found" % (mod.__name__,temp)) # look for 'get_handlers' function h = getattr(mod,hdl_func,None) if h and callable(h): print ("module '%s' : '%s' function found" % (mod.__name__,hdl_func)) objlist = h(halcomp,builder,useropts,gscreen) else: # the module has no get_handlers() callable. # in this case we permit any callable except class Objects in the module to register as handler dbg("module '%s': no '%s' function - registering only functions as callbacks" % (mod.__name__,hdl_func)) objlist = [mod] # extract callback candidates for object in objlist: dbg("Registering handlers in module %s object %s" % (mod.__name__, object)) if isinstance(object, dict): methods = dict.items() else: methods = map(lambda n: (n, getattr(object, n, None)), dir(object)) for method,f in methods: if method.startswith('_'): continue if callable(f): dbg("Register callback '%s' in %s" % (method, basename)) add_handler(method, f) except Exception, e: print ("**** GSCREEN ERROR: trouble looking for handlers in '%s': %s" %(basename, e)) traceback.print_exc() # Wrap lists in Trampoline, unwrap single functions for n,v in list(handlers.items()): if len(v) == 1: handlers[n] = v[0] else: handlers[n] = Trampoline(v) return handlers,mod,object

# look for custom handler files: HANDLER_FN = "%s_handler.py"%skinname local_handler_path = os.path.join(CONFIGPATH,HANDLER_FN) if os.path.exists(local_handler_path): temp = [HANDLER_FN] else: temp = [] handlers,self.handler_module,self.handler_instance = load_handlers(temp,self.halcomp,self.xml,[],self) self.xml.connect_signals(handlers)

python multi-module-test.py

<?xml version="1.0" encoding="UTF-8"?> <interface> <requires lib="gtk+" version="2.18"/> <!-- interface-naming-policy toplevel-contextual --> <object class="GtkWindow" id="window1"> <property name="can_focus">False</property> <signal name="destroy" handler="onDestroy" swapped="no"/> <child> <object class="GtkHBox" id="hbox1"> <property name="visible">True</property> <property name="can_focus">False</property> <child> <object class="GtkButton" id="button1"> <property name="label" translatable="yes">button w. local handler</property> <property name="visible">True</property> <property name="can_focus">True</property> <property name="receives_default">True</property> <signal name="pressed" handler="onButton1Pressed" swapped="no"/> </object> <packing> <property name="expand">True</property> <property name="fill">True</property> <property name="position">0</property> </packing> </child> <child> <object class="GtkButton" id="button2"> <property name="label" translatable="yes">button w. external handler</property> <property name="visible">True</property> <property name="can_focus">True</property> <property name="receives_default">True</property> <signal name="pressed" handler="onButton2Pressed" swapped="no"/> </object> <packing> <property name="expand">True</property> <property name="fill">True</property> <property name="position">1</property> </packing> </child> </object> </child> </object> </interface>

#!/usr/bin/env python import gtk # the following is an external module containing a button handler: import external_module class Handler: def onDestroy(self, *args): print("quit app") gtk.main_quit() # local button handler: def onButton1Pressed(self, button): print("Button1 Pressed") def __init__(self): self.builder = gtk.Builder() self.builder.add_from_file("multi-module-test.glade") # get an instance of the handler class in the external module self.xmod = external_module.externalHandler() # create a dictionary of handler pairs from both this module and the external module self.handlers = {"onButton1Pressed": self.onButton1Pressed, "onDestroy": self.onDestroy, "onButton2Pressed": self.xmod.onButton2Pressed} # pass the dictionary to the connect_signals() function self.builder.connect_signals(self.handlers) self.window = self.builder.get_object("window1") self.window.show_all() try: app = Handler() except KeyboardInterrupt: sys.exit(0) gtk.main()

#!/usr/bin/env python import gtk class externalHandler: def onButton2Pressed(self, button): print("Button2 Pressed")