(preliminary) framework for scriptable applications

Mac/Lib/toolbox/MiniAEFrame.py

+"""MiniAEFrame - A first stab at an AE Application framework.
+This framework is still work-in-progress, so do not rely on it remaining
+unchanged.
+"""
+
+import sys
+import traceback
+import MacOS
+import AE
+from AppleEvents import *
+import Evt
+from Events import *
+import Menu
+import Win
+from Windows import *
+import Qd
+
+import aetools
+import EasyDialogs
+
+kHighLevelEvent = 23				# Not defined anywhere for Python yet?
+
+class MiniApplication:
+	"""A minimal FrameWork.Application-like class"""
+
+	def __init__(self):
+		self.quitting = 0
+		# Initialize menu
+		self.appleid = 1
+		self.quitid = 2
+		Menu.ClearMenuBar()
+		self.applemenu = applemenu = Menu.NewMenu(self.appleid, "\024")
+		applemenu.AppendMenu("All about cgitest...;(-")
+		applemenu.AppendResMenu('DRVR')
+		applemenu.InsertMenu(0)
+		self.quitmenu = Menu.NewMenu(self.quitid, "File")
+		self.quitmenu.AppendMenu("Quit")
+		self.quitmenu.InsertMenu(0)
+		Menu.DrawMenuBar()
+	
+	def __del__(self):
+		self.close()
+		
+	def close(self):
+		pass
+
+	def mainloop(self, mask = everyEvent, timeout = 60*60):
+		while not self.quitting:
+			self.dooneevent(mask, timeout)
+	
+	def dooneevent(self, mask = everyEvent, timeout = 60*60):
+			got, event = Evt.WaitNextEvent(mask, timeout)
+			if got:
+				self.lowlevelhandler(event)
+	
+	def lowlevelhandler(self, event):
+		what, message, when, where, modifiers = event
+		h, v = where
+		if what == kHighLevelEvent:
+			msg = "High Level Event: %s %s" % \
+				(`code(message)`, `code(h | (v<<16))`)
+			try:
+				AE.AEProcessAppleEvent(event)
+			except AE.Error, err:
+				print 'AE error: ', err
+				print 'in', msg
+				traceback.print_exc()
+			return
+		elif what == keyDown:
+			c = chr(message & charCodeMask)
+			if c == '.' and modifiers & cmdKey:
+				raise KeyboardInterrupt, "Command-period"
+		elif what == mouseDown:
+			partcode, window = Win.FindWindow(where)
+			if partcode == inMenuBar:
+				result = Menu.MenuSelect(where)
+				id = (result>>16) & 0xffff	# Hi word
+				item = result & 0xffff		# Lo word
+				if id == self.appleid:
+					if item == 1:
+						EasyDialogs.Message("cgitest - First cgi test")
+						return
+					elif item > 1:
+						name = self.applemenu.GetItem(item)
+						Qd.OpenDeskAcc(name)
+						return
+				if id == self.quitid and item == 1:
+					print "Menu-requested QUIT"
+					self.quitting = 1
+		# Anything not handled is passed to Python/SIOUX
+		MacOS.HandleEvent(event)
+		
+class AEServer:
+	
+	def __init__(self):
+		self.ae_handlers = {}
+		
+	def installaehandler(self, classe, type, callback):
+		AE.AEInstallEventHandler(classe, type, self.callback_wrapper)
+		self.ae_handlers[(classe, type)] = callback
+	
+	def close(self):
+		for classe, type in self.ae_handlers.keys():
+			AE.AERemoveEventHandler(classe, type)
+			
+	def callback_wrapper(self, _request, _reply):
+		_parameters, _attributes = aetools.unpackevent(_request)
+		_class = _attributes['evcl'].type
+		_type = _attributes['evid'].type
+		
+		if self.ae_handlers.has_key((_class, _type)):
+			_function = self.ae_handlers[(_class, _type)]
+		elif self.ae_handlers.has_key((_class, '****')):
+			_function = self.ae_handlers[(_class, '****')]
+		elif self.ae_handlers.has_key(('****', '****')):
+			_function = self.ae_handlers[('****', '****')]
+		else:
+			raise 'Cannot happen: AE callback without handler', (_class, _type)
+		
+		# XXXX Do key-to-name mapping here
+		
+		_parameters['_attributes'] = _attributes
+		_parameters['_class'] = _class
+		_parameters['_type'] = _type
+		if _parameters.has_key('----'):
+			_object = _parameters['----']
+			del _parameters['----']
+			rv = apply(_function, (_object,), _parameters)
+		else:
+			rv = apply(_function, (), _parameters)
+		
+		if rv == None:
+			aetools.packevent(_reply, {})
+		else:
+			aetools.packevent(_reply, {'----':rv})
+			
+def code(x):
+	"Convert a long int to the 4-character code it really is"
+	s = ''
+	for i in range(4):
+		x, c = divmod(x, 256)
+		s = chr(c) + s
+	return s
+
+class _Test(AEServer, MiniApplication):
+	"""Mini test application, handles required events"""
+	
+	def __init__(self):
+		MiniApplication.__init__(self)
+		AEServer.__init__(self)
+		self.installaehandler('aevt', 'oapp', self.open_app)
+		self.installaehandler('aevt', 'quit', self.quit)
+		self.installaehandler('aevt', '****', self.other)
+		self.mainloop()
+
+	def quit(self, **args):
+		self.quitting = 1
+		
+	def open_app(self, **args):
+		pass
+		
+	def other(self, _object=None, _class=None, _type=None, **args):
+		print 'AppleEvent', (_class, _type), 'for', _object, 'Other args:', args
+		
+if __name__ == '__main__':
+	_Test()