Re: Gnome "Quit" menu is like clicking a button in a wxPython modal dialog

#!/usr/bin/env python3

import wx
from threading import Thread
import time

class my_app(wx.App):

	def __init__(self):
		
		# wx.App init:
		wx.App.__init__(self)
				
		# Startup  thread (load instrument config, connect to instrument):
		self.startup_thread = startup_thread(self)

		# Warmup  thread (instrument warmup):
		self.warmup_thread = warmup_thread(self)

		# Main GUI frame:
		self.frame_main = frame_main(self)

	def startup(self):
		# start running, load instrument configuration:
		self.startup_thread.start()

	def warmup(self):
		# instrument warmup (ask user if warmup needed first):
		
		dlg = wx.MessageDialog(self.frame_main, "The instrument has been configured successfully. Do you want to run the warmup procedure?", "Run Warmup?", wx.YES_NO | wx.ICON_QUESTION )
		result = dlg.ShowModal()
		dlg.Destroy()
		
		if result == wx.ID_NO:
			# user skipped warmup:
			print('*** User skipped warmup!')
			dlg=wx.MessageDialog(self.frame_main, "You skipped warmup, lets hope you know what you are doing!", "Be careful!", wx.OK|wx.ICON_WARNING)
			dlg.ShowModal()
			self.frame_main.enable_measurement()
		else:
			print('*** Starting warmup thread.')
			self.warmup_thread.start()
			
	def exit(self):
		# stop all active threads and destroy frames:
		self.startup_thread.stop()
		self.warmup_thread.stop()
		while self.startup_thread.is_active():
			time.sleep(0.1)
		while self.warmup_thread.is_active():
			time.sleep(0.1)
		wx.CallAfter(self.frame_main.Destroy)

			

###################################################################


class frame_main(wx.Frame):

	def __init__(self, app):
		
		wx.Frame.__init__(self, None, title="Instrument Control", size=(250,200), style=wx.DEFAULT_FRAME_STYLE)

		self._app = app

		self.Bind(wx.EVT_CLOSE, self.on_close_event)
				
		# Add a button and stuff:
		self.panel = wx.Panel(self, wx.ID_ANY)
		sizer = wx.BoxSizer(wx.VERTICAL)
		self.button = wx.Button(self.panel, wx.ID_ANY, "Start measurement")
		self.button.Disable() # start with the button disabled
		sizer.Add(self.button, 0, wx.ALL, 4)
		self.panel.SetSizer(sizer)
		self.Layout()
		self.Bind(wx.EVT_BUTTON, self.on_start_measurement, self.button)
		
		self.Show()	
	
	def enable_measurement(self):
		self._app.frame_main.button.Enable()
		
	def on_start_measurement(self, event):
		print('*** on_start_measurement')
	
	def on_close_event(self, event):
		print('*** on_close_event')
		dlg = wx.MessageDialog(self, "Do you really want to close this application?", "Confirm Exit", wx.OK|wx.CANCEL|wx.ICON_QUESTION)
		result = dlg.ShowModal()
		dlg.Destroy()
		if result == wx.ID_OK:			
			self.exit()
			
	def exit (self):
		wx.CallAfter(self._app.exit)
			

###################################################################


# Startup thread:
class startup_thread(Thread):
	# load instrument configuration, and set up instrument
	
	def __init__(self, app):
		Thread.__init__(self)
		self._app = app
		self._stop = False
		self._active = False
		
	def run(self):
		self._active = True
		msg = [ 'Loading instrument configuration from file...', 'Connecting to instrument...', 'Checking if instrument is alright...', 'Getting serial number...', 'Checking instrument status...' 'Turning on the instrument...' ]
		for m in msg:
			if self._stop:
				break
			print('Thread A: ' + m)
			time.sleep(1)
		if not self._stop:
			print('Thread A: Instrument configuration completed!')
			wx.CallAfter(self._app.warmup)
		self._active = False
							
	def stop(self):
		if self._active:
			print('*** Stopping startup_thread')
			self._stop = True
		
	def is_active(self):
		return self._active


###################################################################


# Warmup thread:
class warmup_thread(Thread):
	# instrument warmup
	
	def __init__(self, app):
		Thread.__init__(self)
		self._app = app
		self._stop = False
		self._active = False
		
	def run(self):
		self._active = True
		for k in range(10):
			if self._stop:
				break
			print('Thread B: Instrument warming up...')
			time.sleep(1)
		if not self._stop:
			print('Thread B: Instrument warmup done!')
			wx.CallAfter(self._app.frame_main.enable_measurement)
		self._active = False
							
	def stop(self):
		if self._active:
			print('*** Stopping warmup thread')
			self._stop = True
		
	def is_active(self):
		return self._active


###################################################################


# Main:

# Init the (wx)App:
app = my_app() # init the app

# Startup process:
app.startup() # start background thread to load instrument config, bring up instrument, and set up GUI accordingly
	
# Main event loop:
app.MainLoop()