New Demo Program - shows how to use the new Window parameter relative_location

DemoPrograms/Demo_Window_Relative_Location.py

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+import PySimpleGUI as sg
+
+"""
+    Demo - Relative Location
+    
+    How to create a window at a location relative to where it would normally be placed.
+    
+    Normally, by default, windows are centered on the screen. 
+    Other ways initial window position is determined:
+    1. You can also specify the location when creating it by using the location parameter
+    2. You can use set_options to set the location all windows will be created
+    
+    This demo shows how to use the paramter to Window called relative_location.
+    
+    As the name suggests, it is a position relative to where it would normally be created.
+    
+    Both positive and negative values are valid.  
+        relative_location=(0, -150) will create the window UP 150 pixels from where it would normally be created
+
+    Copyright 2021 PySimpleGUI
+"""
+
+
+def second_window():
+    layout = [[sg.Text('Window 2\nrelative_location=(0,-150)')],
+              [sg.Button('Exit')]]
+
+    window = sg.Window('Window 2', layout, relative_location=(0,-150), finalize=True)
+    return window
+
+
+def main():
+    sg.set_options(font='_ 18', keep_on_top=True)
+    layout = [  [sg.Text('Window 1\nrelative_location=(0,150)')],
+                [sg.Button('Popup'), sg.Button('Exit')]  ]
+
+    window = sg.Window('Window 1', layout, relative_location=(0,150), finalize=True)
+
+    window2 = second_window()
+
+    while True:             # Event Loop
+        window, event, values = sg.read_all_windows()
+        if window == None:      # If all windows were closed
+            break
+        if event == sg.WIN_CLOSED or event == 'Exit':
+            window.close()
+        if event == 'Popup':
+            sg.popup('Popups will go to the center of course!')
+
+    sg.popup_no_buttons('All windows closed... Bye!', background_color='red', text_color='white', auto_close_duration=3, auto_close=True, no_titlebar=True)
+
+if __name__ == '__main__':
+    main()