Initial check-in

DemoPrograms/Demo_Keyboard_ENTER_Presses_Button.py

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+import PySimpleGUI as sg
+# import PySimpleGUIQt as sg
+
+"""
+    tkinter and Qt do not "activate" buttons by pressing the ENTER key with the button highlighted / in focus
+    This demo will enable the application to click on a button if the button has focus (is highlighted) and the
+    user presses the ENTER key.
+    NOTE that the SPACE BAR works correctly out of the box with both tkinter and Qt.  If a button has focus and 
+    you press the space bar, then tkinter and Qt will both consider that a button click.  But not so with the ENTER
+    key.
+    
+    The solution is for your program to read the keyboard presses and act upon those directly.  It's trivial logic
+    in the end:
+    1. Get a key press
+    2. See if the key is the ENTER key
+    3. Find the Element that currently has focus
+    4. Click the Button if the Element with focus is a button 
+
+"""
+
+QT_ENTER_KEY1 =  'special 16777220'
+QT_ENTER_KEY2 =  'special 16777221'
+
+layout = [  [sg.T('Test of Enter Key use')],
+            [sg.In(key='_IN_')],
+            [sg.Button('Button 1', key='_1_')],
+            [sg.Button('Button 2', key='_2_')],
+            [sg.Button('Button 3', key='_3_')],  ]
+
+window = sg.Window('My new window', layout,
+                   return_keyboard_events=True)
+while True:             # Event Loop
+    event, values = window.Read()
+    if event is None:
+        break
+    if event in ('\r', QT_ENTER_KEY1, QT_ENTER_KEY2):         # Check for ENTER key
+        elem = window.FindElementWithFocus()                            # go find element with Focus
+        if elem is not None and elem.Type == sg.ELEM_TYPE_BUTTON:       # if it's a button element, click it
+            elem.Click()
+        # check for buttons that have been clicked
+    elif event == '_1_':
+        print('Button 1 clicked')
+    elif event == '_2_':
+        print('Button 2 clicked')
+    elif event == '_3_':
+        print('Button 3 clicked')