If the cursor is hover a view.

Raymond

is there a built-in way to detect if the mouse cursor is on hover a view ?
if not, can i do it with objc_util

Like this on swift UIkit:

class MyView: UIView {
    override func hover(_ hover: Bool) {
        super.hover(hover)

        if hover {
            // This code will execute when the mouse cursor enters the view.
        } else {
            // This code will execute when the mouse cursor leaves the view.
        }
    }
}

cvp

@Raymond should be possible, see https://developer.apple.com/documentation/uikit/uihovergesturerecognizer

Raymond

@cvp Can you write an example with it ?

cvp

@Raymond Not today. I guess @mikael could easily modify its gestures module to support this UIHoverGestureRecognizer recognizer.

If nobody is available, I could try tomorrow in the afternoon (Belgian time) but I don't have a mouse or a pencil. Or perhaps I could use the mouse of my Mac.

cvp

This post is deleted!

cvp

@Raymond tried this code successfully

import ui
from gestures import *

UIHoverGestureRecognizer = ObjCClass('UIHoverGestureRecognizer')

class MyView (ui.View):
	@on_main_thread
	def __init__(self, *args, **kwargs):
		ui.View.__init__(self, *args, **kwargs)
		self.background_color = 'lightgray'
		
		self.v = ui.View()
		self.v.frame = (10,10,100,100)
		self.v.background_color = 'white'
		self.add_subview(self.v) 
		
		handler = UIGestureRecognizerDelegate(UIHoverGestureRecognizer, self.v, self.hover)
		
	def hover(self, data):
		print(data)

def main():
	mv = MyView(frame=(0, 0, 500, 500))
	mv.present('sheet')	
	
if __name__ == '__main__':
	main()

cvp

@Raymond or try with

	def hover(self, data):
		if data.state == 1: # began
			data.view.background_color = 'red'
		elif data.state == 2: # changed
			pass
		elif data.state == 3: # ended
			data.view.background_color = 'white'
		#print(data)

Raymond

@cvp i am using pythonista beta, the new one.

The code:

import ui
from objc_util import *

UIHoverGestureRecognizer = ObjCClass('UIHoverGestureRecognizer')

class MyView (ui.View):
	@on_main_thread
	def __init__(self, *args, **kwargs):
		ui.View.__init__(self, *args, **kwargs)
		self.background_color = 'lightgray'
		
		self.v = ui.View()
		self.v.frame = (10,10,100,100)
		self.v.background_color = 'white'
		self.add_subview(self.v) 
		
		handler = UIGestureRecognizerDelegate(UIHoverGestureRecognizer, self.v, self.hover)
		
	def hover(self, data):
		if data.state == 1: # began
			data.view.background_color = 'red'
		elif data.state == 2: # changed
			pass
		elif data.state == 3: # ended
			data.view.background_color = 'white'
		#print(data)



v = MyView()

There is this error with your code:

Exception ignored on calling ctypes callback function: <function OMMainThreadDispatcher_invoke_imp at 0x1152d0160>
Traceback (most recent call last):
  File "/var/containers/Bundle/Application/534A53C8-B40F-4EBF-971B-5FBA04EFD7E4/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/pythonista/objc_util.py", line 1066, in OMMainThreadDispatcher_invoke_imp
    retval = func(*args, **kwargs)
  File "/private/var/mobile/Containers/Shared/AppGroup/48E83FD5-AA04-45A2-86D9-75BE4BCA2B89/Pythonista3/Documents/T.py", line 17, in __init__
    handler = UIGestureRecognizerDelegate(UIHoverGestureRecognizer, self.v, self.hover)
NameError: name 'UIGestureRecognizerDelegate' is not defined

cvp

@Raymond I also use the new beta but you did change my code.
I don't import objc_util but gestures, the module I described some posts above.
You have to download it and install in site-packages

gestures.py

cvp

@Raymond If you don't like to import gestures, I could try to extract necessary code... But not for today

Raymond

@cvp No it works!! Thank you very much !!

cvp

@Raymond 👍