New Column Element Demo - "Swap In/Out" entire window

DemoPrograms/Demo_Column_Elem_Swap_Entire_Window.py

@@ -0,0 +1,45 @@
+import PySimpleGUI as sg
+
+"""
+    Demo - Multiple layouts in a single window that are swapped in and out
+
+    If you've ever wanted to replace the contents of a window with another layout then perhaps
+    this demo is for you.  You cannot actually change the layout of a window dynamically, but what
+    you can do is make elements visible and invisible.  
+    
+    To "swap out" a portion of a window, use a Column element for that portion.  Add multiple Columns
+    on the same row and make only 1 of them active at a time
+"""
+
+# ----------- Create the 3 layouts this Window will display -----------
+layout1 = [[sg.Text('This is layout 1 - It is all Checkboxes')],
+           *[[sg.CB(f'Checkbox {i}')] for i in range(5)]]
+
+layout2 = [[sg.Text('This is layout 2')],
+           [sg.Input(key='-IN-')],
+           [sg.Input(key='-IN2-')]]
+
+layout3 = [[sg.Text('This is layout 3 - It is all Radio Buttons')],
+           *[[sg.R(f'Radio {i}', 1)] for i in range(8)]]
+
+# ----------- Create actual layout using Columns and a row of Buttons
+layout = [[sg.Column(layout1, key='-COL1-'), sg.Column(layout2, visible=False, key='-COL2-'), sg.Column(layout3, visible=False, key='-COL3-')],
+          [sg.Button('Cycle Layout'), sg.Button('1'), sg.Button('2'), sg.Button('3'), sg.Button('Exit')]]
+
+window = sg.Window('Swapping the contents of a window', layout)
+
+layout = 1  # The currently visible layout
+while True:
+    event, values = window.read()
+    print(event, values)
+    if event in (None, 'Exit'):
+        break
+    if event == 'Cycle Layout':
+        window[f'-COL{layout}-'].update(visible=False)
+        layout = layout + 1 if layout < 3 else 1
+        window[f'-COL{layout}-'].update(visible=True)
+    elif event in '123':
+        window[f'-COL{layout}-'].update(visible=False)
+        layout = int(event)
+        window[f'-COL{layout}-'].update(visible=True)
+window.close()