New Demo Func Callback Sim

Demo_Func_Callback_Simulation.py

@@ -0,0 +1,36 @@
+import PySimpleGUI as sg
+
+# This design pattern simulates button callbacks
+# Note that callbacks are NOT a part of the package's interface to the
+# caller intentionally.  The underlying implementation actually does use
+# tkinter callbacks.  They are simply hidden from the user.
+
+# The callback functions
+def button1():
+    print('Button 1 callback')
+
+def button2():
+    print('Button 2 callback')
+
+# Create a standard form
+form = sg.FlexForm('Button callback example')
+# Layout the design of the GUI
+layout = [[sg.Text('Please click a button', auto_size_text=True)],
+          [sg.ReadFormButton('1'), sg.ReadFormButton('2'), sg.Quit()]]
+# Show the form to the user
+form.Layout(layout)
+
+# Event loop. Read buttons, make callbacks
+while True:
+    # Read the form
+    button, value = form.Read()
+    # Take appropriate action based on button
+    if button == '1':
+        button1()
+    elif button == '2':
+        button2()
+    elif button =='Quit' or button is None:
+        break
+
+# All done!
+sg.MsgBoxOK('Done')