How to get key pressing in scene module?

yaley

Hi, i am a newbie and i have a problem.
In my project, cannot detect am i pressing the key, if use ui.View.get_key_commands() and ui.View.key_command, it can only detect the keypress, not keydown

So how???

JonB

https://www.swiftbysundell.com/tips/handling-keyup-and-keydown-events/

This is now possible in iOS 13.4, however, someone will need to translate this to ObjC. @cvp? @mikael? I can give it a shot, but not until next week.

yaley

sorry, but that website was JS or Java…..

JonB

It is swift, but it is possible to convert that to objc_util

cvp

@JonB I would like to help but it seems to be a little bit too complex for me, I guess it is better to wait that you find the time to do it. Sorry, but happy to discover this new feature from Apple

JonB

I believe we just need to have a custom view controller that implements

pressesBegan_withEvent(presses, event)

Where presses is an NSSet of UIPresses. You can use presses.allObjects() to convert a NSSet to array...from.there, key.

JonB

E.g. presses.allObjects()[0].key().keyCode()

yaley

@JonB what is pressesBegan_withEvent(presses, event)

cvp

@yaley said

what is pressesBegan_withEvent(presses, event)

A method to implement to the custom UIViewController, this is a new standard method called when a key goes down

yaley

@cvp so the whole code is like…. objc.ObjCClass("UIViewController").pressBegan_withEvent(presses, event)
that?

cvp

@yaley Ho no. This is not so simple. You have to create a custom UIViewController and configure the used methods and protocols. And one method could be the new one which should be called at each key down

You could check this topic where a such ViewController is used with a user method CustomViewController_touchesBegan_withEvent_

Only to show it is not so easy

yaley

@cvp ok Thanks for your helping!

cvp

@yaley Sorry that I can't help more...

yaley

@cvp oh sorry, i have another question, what are presses and event?
Is presses like [“a”, “b”, “c”] and is event like a function?

cvp

@yaley presses is a set of UIPress objects and event is an UIPressesEvent object. Both are ObjectiveC classes

cvp

@yaley see Apple doc UIPressesEvent and UIPress

yaley

@cvp thank you ❤️ you helped me a lot

cvp

@yaley I hoped that some code like this could work, but not true. Thus, sure this is too complex for me. We will wait availability of @JonB

from objc_util import *
import ui

UIViewController = ObjCClass('UIViewController')

# Some callback definitions used by create_objc_class
def pressesBegan_withEvent(_cmd, _presses, _event):
	print('pressesBegan_withEvent')	
	presses = ObjCInstance(_presses)

# The main class...
class MyView(ui.View):
	def __init__(self):
		super().__init__(self)
		self.background_color = 'gray'

	@on_main_thread
	def initialize(self):
		
		v = ui.View()
		v.frame = self.frame
		tf = ui.TextField()
		tf.frame = (10,10,200,32)
		v.add_subview(tf)
		vo = ObjCInstance(v)
		#print(vo)
		#print(dir(vo))

		# set up the custom view controller
		methods = [pressesBegan_withEvent]
		protocols = []
		CustomViewController = create_objc_class('CustomViewController', UIViewController, methods=methods, protocols=protocols)
		cvc = CustomViewController.alloc().init()
		cvc.view = vo
		
		# internal scheming...
		self_objc = ObjCInstance(self)
		self_objc.nextResponder().addChildViewController_(cvc)
		self_objc.addSubview_(vo)
		cvc.didMoveToParentViewController_(self_objc)
		
		tf.begin_editing()
		

if __name__ == '__main__':
    v = MyView()
    v.present('fullscreen')
    v.initialize()

yaley

@cvp it doesn’t work….. but really thanks for your helping

cvp

@yaley said

it doesn’t work

That's what I said with "it is not true" and I'm sorry for you but I'm sure that our guru, read @JonB, will solve that as soon he is available (dear John, sorry to put pressure on you)