[SOLVED] Create signal from input in gtk3, python, raspberry pi

Issue

I have made a gui program on raspberry pi3 and I want to get a signal from input (gpio) to execute some commands like when a button is pressed a signal is generated. I want to get this signal but from an input. the code is

import time
import gi
import  RPi.GPIO as GPIO
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(18, GPIO.IN,pull_up_down=GPIO.PUD_DOWN)

class gui:
  inputValue = GPIO.input(18)
  if inputValue == True:
    self.label.set_text("There is input")
  def on_window1_destroy(self, object, data=None):
    print( "quit with cancel")
    Gtk.main_quit()
  def on_okButton_clicked(self,button,data=None):
    self.label.set_text("Waiting for input")
  def __init__(self):
    self.gladefile = "2.glade"
    self.builder = Gtk.Builder()
    self.builder.add_from_file(self.gladefile)
    self.builder.connect_signals(self)
    self.window = self.builder.get_object("window1")
    self.label = self.builder.get_object("Label")
    self.label.set_text("Hello")
    self.window.show_all()

if __name__ == "__main__":
  main = gui()
  Gtk.main()

The input is taken only at the beginning of the execution and when I use a loop the window freezes. please help me. thanks.

Solution

I solved it by editing the code as bellow:

import time
import gi
import  RPi.GPIO as GPIO
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(18, GPIO.IN,pull_up_down=GPIO.PUD_DOWN)

class gui:

  def pin_callback (self, channel):
    print ('pressed')
    self.label.set_text("INput")

  def on_window1_destroy(self, object, data=None):
    print( "quit with cancel")
    Gtk.main_quit()
  def on_okButton_clicked(self,button,data=None):
    self.label.set_text("Waiting for input")
  def __init__(self):
    self.gladefile = "m.glade"
    self.builder = Gtk.Builder()
    self.builder.add_from_file(self.gladefile)
    self.builder.connect_signals(self)
    self.window = self.builder.get_object("window1")
    self.label = self.builder.get_object("Label")
    self.label.set_text("Hello")
    self.window.show_all()

if __name__ == "__main__":
  main = gui()
  GPIO.add_event_detect(18, GPIO.BOTH, callback=main.pin_callback)
  Gtk.main()

Thank you very much, theGtknerd.

Answered By - Mohamed Gad