Merge pull request #2397 from PySimpleGUI/Dev-latest

Demo of binding tkinter events to extend PySimpleGUI

DemoPrograms/Demo_Event_Binding.py

@@ -0,0 +1,35 @@
+import PySimpleGUI as sg
+
+"""
+    Extending PySimpleGUI using the tkinter event bindings
+
+    The idea here is to enable you to receive tkinter "Events" through the normal place you
+    get your events, the window.read() call.
+
+    Both elements and windows have a bind method.
+    window.bind(tkinter_event_string, key)   or   element.bind(tkinter_event_string, key_modifier)
+    First parameter is the tkinter event string.  These are things like <FocusIn> <Button-1> <Button-3> <Enter>
+    Second parameter for windows is an entire key, for elements is something added onto a key.  This key or modified key is what is returned when you read the window.
+    If the key modifier is text and the key is text, then the key returned from the read will be the 2 concatenated together.  Otherwise your event will be a tuple containing the key_modifier value you pass in and the key belonging to the element the event happened to.
+"""
+sg.change_look_and_feel('Dark Blue 3')
+
+layout = [  [sg.Text('Move mouse over me', key='-TEXT-')],
+            [sg.In(key='-IN-')],
+            [sg.Button('Right Click Me', key='-BUTTON-'), sg.Button('Exit')]  ]
+
+window = sg.Window('Window Title', layout, finalize=True)
+
+window.bind('<FocusOut>', '+FOCUS OUT+')
+
+window['-BUTTON-'].bind('<Button-3>', '+RIGHT CLICK+')
+window['-TEXT-'].bind('<Enter>', '+MOUSE OVER+')
+window['-TEXT-'].bind('<Leave>', '+MOUSE AWAY+')
+window['-IN-'].bind('<FocusIn>', '+INPUT FOCUS+')
+
+while True:             # Event Loop
+    event, values = window.read()
+    print(event, values)
+    if event in (None, 'Exit'):
+        break
+window.close()