[Godot] add menu button

Godot 3.4.2

Add menus quickly and easily , In the following code , After running, two menus will be created File、Edit

##  Menu list 

extends HBoxContainer


const MenuKey = {
    
	"MenuName": "menu_name",
	'ScanCode': "scancode",
	"Control" : 'control',
	"Command" : 'Command',
	"Shift": "shift",
	"Alt": "alt",
}

##  Add a menu by adding and modifying the following data 
const MenuData = {
    
	"File": [
		{
    
			MenuKey.MenuName: "Open Project",	#  The name of the menu sub item 
			MenuKey.ScanCode: KEY_O,	#  Characters required  O
			MenuKey.Control: true,		#  need ctrl  key 
		},
		{
    MenuKey.MenuName: "---"},		#  Beginning with  ---  Is a separator 
		{
    
			MenuKey.MenuName: "Exit",
			MenuKey.ScanCode: KEY_E,
			MenuKey.Control: true,
		},
	],
	"Edit": [
		{
    
			MenuKey.MenuName: "Undo",
			MenuKey.ScanCode: KEY_Z,
			MenuKey.Control: true,
		},
	]
}


func _ready():
	#  Add menu button 
	for menu_name in MenuData.keys():
		var menu = MenuButton.new()
		menu.switch_on_hover = true
		menu.text = menu_name
		add_child(menu)
		#  Traverse menu data 
		var popup := menu.get_popup() as PopupMenu
		var idx := -1
		for item_data in MenuData[menu_name]:
			idx += 1
			#  Menu name 
			var item_name := item_data[MenuKey.MenuName] as String
			#  Add separator 
			if item_name.begins_with('---'):
				popup.add_separator(item_name.right(3))
				continue
			#  Add menu item 
			popup.add_item(item_name)
			#  Set menu shortcuts 
			var shortcut = ShortCut.new()
			var input = InputEventKey.new()
			shortcut.shortcut = input
			if item_data.has(MenuKey.ScanCode):
				input.scancode = item_data[MenuKey.ScanCode]
			if item_data.has(MenuKey.Control):
				input.control = item_data[MenuKey.Control]
			if item_data.has(MenuKey.Command):
				input.command = item_data[MenuKey.Command]
			if item_data.has(MenuKey.Alt):
				input.alt = item_data[MenuKey.Alt]
			if item_data.has(MenuKey.Shift):
				input.shift = item_data[MenuKey.Shift]
			popup.set_item_shortcut(idx, shortcut)
		popup.connect("index_pressed", self, "_menu_index_pressed", [menu_name])


##  Press menu item 
func _menu_index_pressed(idx: int, menu_name: String) -> void:
	
	#  The data list of the corresponding menu 
	var menu_data := MenuData[menu_name] as Array
	#  The data of the corresponding menu item 
	var item_data := menu_data[idx] as Dictionary
	#  Menu name 
	var item_name := item_data[MenuKey.MenuName] as String
	
	print(' Press down  %s  Menu  %s  term ' % [menu_name, item_name])
	
	#  according to  item_name  Executive function 
	#  example ：
	match item_name:
		'Open Project':
			pass
		'Exit':
			get_tree().quit()