navview_utils.py

navview_utils.py

import ui,console,time
from objc_util import on_main_thread
@on_main_thread
def get_top_view(navigation_view):
	'''returns the top (aka visible) view from a navigation view'''
	import ctypes
	nc= navigation_view.objc_instance.navigationController()
	tc=nc.topViewController()
	v=tc.view()
	return v.pyObject(restype=ctypes.py_object,argtypes=[])
	
@on_main_thread
def get_bottom_view(navigation_view):
	'''returns the top (aka visible) view from a navigation view'''
	import ctypes
	return navigation_view.objc_instance.navigationController().bottomViewController().view().pyObject(restype=ctypes.py_object,argtypes=[])
	
@on_main_thread
def get_view_stack(navigation_view):
	import ctypes
	nc= navigation_view.objc_instance.navigationController()
	view_list=[]
	for vc in nc.viewControllers():
		view_list.append(vc.view().pyObject(restype=ctypes.py_object,argtypes=[]))
	return view_list

@on_main_thread
def set_view_stack(navigation_view, view_list,animated=True):
	'''sets view order.  views must have been previously pushed.  
	e.g to make the top view the new root view:
		set_view_stack(nv, [get_view_stack(nv)[-1]])
	   '''
	view_controllers=[]
	if not hasattr(view_list,'__iter__'):
		view_list=[view_list]
	nc= navigation_view.objc_instance.navigationController()
	nc_views=get_view_stack(navigation_view)
	for i,v in enumerate(view_list):
		try: 
			idx=nc_views.index(v)
			view_controllers.append(nc.viewControllers()[idx])
		except ValueError:
			raise ValueError('view at index {} not on stack ',i)
			
	nc.setViewControllers_animated_(view_controllers,animated)
	
def pop_to_root(navigation_view,animated=True):
	'''pops all views to return to the original root view'''
	navigation_view.objc_instance.navigationController().popToRootViewControllerAnimated_(animated)


if __name__=='__main__':
	class verboseview(ui.View):
		def update(self):
			try:
				self.counter+=1
			except AttributeError:
				self.counter=0			
			console.hud_alert('{0.name} {0.counter}'.format(self))
		def layout(self):
			console.hud_alert('{0.name} '.format(self))
	v=verboseview(name='Hello',frame=(0,0,222,222))
	#v.update_interval=0.5
	vw=verboseview(name='World',frame=(0,0,222,222))
	#vw.update_interval=0.3
	nv=ui.NavigationView(v)
	nv.present('sheet')
	nv.push_view(vw)
	
	print(get_top_view(nv).name)



'''
import ui
from objc_util import *
from objc_hacks import swizzle


def willDismiss(_self,_sel):
	pass
swizzle.swizzle(ObjCClass('SUINavigationView_PY3'), 'willDismiss', willDismiss, type_encoding='v@:')

v=ui.View()
nv=ui.NavigationView(v)
nv.present('panel')
'''