Function change_look_and_feel

PySimpleGUI/PySimpleGUI.py:20059–20145

Change the "color scheme" of all future PySimpleGUI Windows. The scheme are string names that specify a group of colors. Background colors, text colors, button colors. There are 13 different color settings that are changed at one time using a single call to ChangeLookAndFeel The loo

(index, force=False)

def change_look_and_feel(index, force=False):
    """
    Change the "color scheme" of all future PySimpleGUI Windows.
    The scheme are string names that specify a group of colors. Background colors, text colors, button colors.
    There are 13 different color settings that are changed at one time using a single call to ChangeLookAndFeel
    The look and feel table itself has these indexes into the dictionary LOOK_AND_FEEL_TABLE.
    The original list was (prior to a major rework and renaming)... these names still work...
    In Nov 2019 a new Theme Formula was devised to make choosing a theme easier:
    The "Formula" is:
    ["Dark" or "Light"] Color Number
    Colors can be Blue Brown Grey Green Purple Red Teal Yellow Black
    The number will vary for each pair. There are more DarkGrey entries than there are LightYellow for example.
    Default = The default settings (only button color is different than system default)
    Default1 = The full system default including the button (everything's gray... how sad... don't be all gray... please....)
    :param index: the name of the index into the Look and Feel table (does not have to be exact, can be "fuzzy")
    :type index:  (str)
    :param force: no longer used
    :type force:  (bool)
    :return:      None
    :rtype:       None
    """
    global CURRENT_LOOK_AND_FEEL

    # if running_mac() and not force:
    #     print('*** Changing look and feel is not supported on Mac platform ***')
    #     return

    requested_theme_name = index
    theme_names_list = list_of_look_and_feel_values()
    # normalize available l&f values by setting all to lower case
    lf_values_lowercase = [item.lower() for item in theme_names_list]
    # option 1
    opt1 = requested_theme_name.replace(' ', '').lower()
    # option 3 is option 1 with gray replaced with grey
    opt3 = opt1.replace('gray', 'grey')
    # option 2 (reverse lookup)
    optx = requested_theme_name.lower().split(' ')
    optx.reverse()
    opt2 = ''.join(optx)

    # search for valid l&f name
    if requested_theme_name in theme_names_list:
        ix = theme_names_list.index(requested_theme_name)
    elif opt1 in lf_values_lowercase:
        ix = lf_values_lowercase.index(opt1)
    elif opt2 in lf_values_lowercase:
        ix = lf_values_lowercase.index(opt2)
    elif opt3 in lf_values_lowercase:
        ix = lf_values_lowercase.index(opt3)
    else:
        ix = random.randint(0, len(lf_values_lowercase) - 1)
        print('** Warning - {} Theme is not a valid theme. Change your theme call. **'.format(index))
        print('valid values are', list_of_look_and_feel_values())
        print('Instead, please enjoy a random Theme named {}'.format(list_of_look_and_feel_values()[ix]))

    selection = theme_names_list[ix]
    CURRENT_LOOK_AND_FEEL = selection
    try: