New Demo Program - Save/Load window inputs using User Settings API (JSON file)

DemoPrograms/Demo_User_Setting_Save_Window_Inputs.py

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+import PySimpleGUI as sg
+
+"""
+    Demo - User Setting API to save and load a window's contents
+
+    The PySimpleGUI "User Settings API" is a simple interface to JSON and Config Files.
+    If you're thinking of storying information in a JSON file, consider using the PySimpleGUI
+        User Settings API calls.  They make JSON files act like dictionaries.  There's no need
+        to load nor save as that's done for you.
+
+    There are 2 interfaces to the User Settings API.
+        1. Function calls - sg.user_settings
+        2. UserSettings Object - Uses a simple class interface
+
+    Note that using the Object/class interface does not require you to write a class.  If you're using
+    PySimpleGUI, you are already using many different objects.  The Elements & Window are objects.
+
+    In this demo, a UserSetting object is used to save the values from Input elements into a JSON file.
+    You can also re-loda the values from the JSON into your window.
+
+    Copyright 2022 PySimpleGUI
+"""
+
+# Create a UserSettings object. The JSON file will be saved in the same folder as this .py file
+window_contents = sg.UserSettings(path='.', filename='mysettings.json')
+
+def main():
+    layout = [  [sg.Text('My Window')],
+                [sg.Input(key='-IN1-')],
+                [sg.Input(key='-IN2-')],
+                [sg.Input(key='-IN3-')],
+                [sg.Input(key='-IN4-')],
+                [sg.Input(key='-IN5-')],
+                [sg.Button('Save'), sg.Button('Load'), sg.Button('Exit')]  ]
+
+    window = sg.Window('Save / Load Inputs Using User Settings API', layout)
+
+    while True:             # Event Loop
+        event, values = window.read()
+        print(event, values)
+        if event == sg.WIN_CLOSED or event == 'Exit':
+            break
+
+        # To SAVE the values, loop through all elements in the values dictionary and save their values
+        if event == 'Save':
+            for key in values:
+                window_contents[key] = values[key]
+        # To LOAD values from a settings file into a window, loop through values dictionary and update each element
+        if event == 'Load':
+            for key in values:
+                saved_value = window_contents[key]
+                window[key].update(saved_value)
+
+    window.close()
+
+if __name__ == '__main__':
+    main()