Custom Unreal Startup Menu Template

unrealMenu.py

import unreal


def create_menu():
    # Get the main ToolMenu of Unreal
    menus = unreal.ToolMenus.get()
    main_menu = menus.find_menu('LevelEditor.MainMenu')

    # Create custom ToolMenu
    my_menu = main_menu.add_sub_menu(
        owner=main_menu.get_name(),
        name='My Menu',
        label='My Menu',
        section_name=''
    )

    # ToolMenuSection for ToolMenuEntry
    my_menu.add_section(section_name='Section A', label='Menu Entry Section')

    # ToolMenuEntry
    entry_a = unreal.ToolMenuEntry(type=unreal.MultiBlockType.MENU_ENTRY)
    entry_a.set_label("I'm Menu Entry A")
    entry_a.set_string_command(
        type=unreal.ToolMenuStringCommandType.PYTHON,
        custom_type=unreal.Name(''),
        string='unreal.log(\'Hello\')'
    )
    my_menu.add_menu_entry(section_name='Section A', args=entry_a)

    entry_b = unreal.ToolMenuEntry(type=unreal.MultiBlockType.MENU_ENTRY)
    entry_b.set_label("I'm Menu Entry B")
    my_menu.add_menu_entry(section_name='Section A', args=entry_b)

    # ToolMenuSection for a sub ToolMenu
    my_menu.add_section(section_name='Section B', label='Submenu Section')

    # sub ToolMenu
    my_submenu = my_menu.add_sub_menu(
        owner=my_menu.get_name(),
        name='MySubmenu',
        label="I'm a Submenu",
        section_name='Section B'
    )

    # ToolMenuEntry in Sub ToolMenu
    entry_c = unreal.ToolMenuEntry(type=unreal.MultiBlockType.MENU_ENTRY)
    entry_c.set_label("I'm Menu Entry C")
    my_submenu.add_menu_entry(section_name='', args=entry_c)

    menus.refresh_all_widgets()