customMenuItem.py

customMenuItem.py

from objc_util import *
from objc_hacks import swizzle # github.com/jsbain/objc_hacks.git

NSNotificationCenter=ObjCClass('NSNotificationCenter')

class PYUIMenuItem(object):
	'''Base class representing a uimenuitem, which can be added to the manager.  
	Each item must have a title string, a selector name, and an action callback.
	Must define subclasses with __selector__ field, __title__ string
	Action callback must be of form 
		def action(self, selected_text (str), selection (list), editorview):
			
	'''
	def __new__(cls):
		if not hasattr(cls,'__selector__'):
			raise Exception('Subclass must define __selector__')
		if not hasattr(cls,'__title__'):
			raise Exception('Subclass must define __title__')		
		if not hasattr(cls,'action'):
			raise Exception('Subclass must define action method')		
		menuitem=ObjCClass('UIMenuItem').alloc().initWithTitle_action_(cls.__title__,sel(cls.__selector__))
		cls.__menuitem__=menuitem
		return cls

	def __callback__(self, _editorview, _cmd, menucontroller):
		# this is the actual callback that objc sees.
		# dont override this 
		editorView=ObjCInstance(_editorview)
		txt=str(editorView.textView().text())
		start=editorView.textView().selectedTextRange().start().index()
		end=editorView.textView().selectedTextRange().end().index()
		selected_text=txt[start:end]
		self.action(self,selected_text, [start, end], editorView)

class MenuNotificationObserver(object):
	def __init__(self,menuitems)	:
		self.menuitems=menuitems
		self._observer=None
		self.center=NSNotificationCenter.defaultCenter()
		
		#clean up old observers, so we dont have old copies responding to notifications
		import objc_util
		for obj in objc_util._retained_globals:
			if isinstance(obj,ObjCInstance):
				if 'NSObserver' in str(ObjCInstance(c.object_getClass(obj.ptr))):
					if 'ShowMenuNotification' in str(obj.name()):
						self.center.removeObserver_(obj)
						release_global(obj)
		
	def _block(self,_cmd,notification):
		try:
			#print('observer')
			menucontroller=ObjCInstance(notification).object()
			#print(menucontroller)

			''' if we hook WillShow instead of DidShow, we can stop the menu from showing, then update it, and show it to avoid blinking effect.  but, willshow gets fired twice, so need to only run if our custom menu is not there'''

			items=list(menucontroller.menuItems())
			itemTitles=[item.__title__ for item in self.menuitems]
			if not itemTitles[-1] in [str(i.title()) for i in items]:
				def update_menu():
					menucontroller.setMenuVisible_animated_(False,False)
					for item in self.menuitems:
						items.append(item.__menuitem__)
					menucontroller.setMenuItems_(ns(items))
					menucontroller.update()
					menucontroller.setMenuVisible_animated_(True,False)
				update_menu()
		except Exception as e:
			print(e)
			
	def start(self):	
		if self._observer:
			raise Exception('observer already started')
		self._blk=ObjCBlock(self._block,
												restype=None,
												argtypes=[c_void_p,c_void_p])
		self._observer = self.center.addObserverForName_object_queue_usingBlock_(
				'UIMenuControllerWillShowMenuNotification',None,None,self._blk)
		observer=self._observer
		center=self.center
		retain_global(observer)
		
		#attempt at safety.. this doesnt work at all..
		'''
		import weakref
		def on_die(killed_ref):
			print('reference released!')
			import objc_util
			center.removeObserver_(observer)
			objc_util.release_global(observer)
		self._del_ref = weakref.ref(self, on_die)
		'''

	def stop(self):	
		import objc_util
		if self._observer:
			self.center.removeObserver_(self._observer)
			objc_util.release_global(self._observer)
			self._observer=None
		self._del_ref=None
	
	def register(self):
		#we must swizzle our own selector into the responder chain
		import editor
		editorView=editor._get_editor_tab().editorView()
		OMTextEditorView=ObjCInstance(c.object_getClass(editorView.ptr))
		for uimenu in self.menuitems:
			try:
				import functools
				cb=functools.partial(uimenu.__callback__,uimenu)
				swizzle.swizzle(OMTextEditorView,uimenu.__selector__,cb,type_encoding='v@:@')
			except:
				print('could not swizzle', uimenu.__title__)

if __name__=='__main__':
	#create two example menu items
	class AppleLookupMenu(PYUIMenuItem):
		__selector__ = 'appleDocLookup:'
		__title__ = 'Apple'
		def action(self, selected_text, selection, editorview):
			import ui
			w=ui.WebView()
			import urllib.parse
			w.load_url('http://www.google.com#q={}'.format(urllib.parse.quote(selected_text+' host:developer.apple.com')))
			w.present('panel')
		
	class TestMenu(PYUIMenuItem):
		__selector__ = 'handleTestMenu:'
		__title__ = 'Test'
		def action(self, selected_text, selection, editorview):
			import ui
			print(selected_text)
			print(selection)
			print(editorview)
		
	g=MenuNotificationObserver([AppleLookupMenu(), TestMenu()])
	g.register()
	g.start()