Godot - GraphEdits, GraphNodes, and PopupMenus at runtime

godot generating_a_scene_tree_dynamically

# Ref : https://www.reddit.com/r/godot/comments/7bi5uf/generating_a_scene_tree_dynamically/
# Create a root Node and name is DynamicNodeGraph

extends Node

var RootNode
var SomeGraphEdit
var SomePopupMenu
var SomePopupMenuVisible = false
var RMBPressed = false

func _menu_item_pressed(ID):
	print("Menu Item Pressed: ", SomePopupMenu.get_item_text(ID))
	if(SomePopupMenu.get_item_text(ID) == "Quit"):
		get_tree().quit()
	if(SomePopupMenu.get_item_text(ID) == "Add Node"):
		var SomeGraphNode = GraphNode.new()
		SomeGraphNode.rect_position = get_viewport().get_mouse_position()
		SomeGraphNode.rect_min_size = Vector2(160, 120)
		SomeGraphNode.set_slot(0, true, 0, Color(0.0, 1.0, 1.0, 1.0), true, 0, Color(1.0, 0.0, 0.0, 1.0))
		SomeGraphNode.set_slot(1, false, 1, Color(1.0, 0.0, 1.0, 1.0), true, 2, Color(0.0, 1.0, 0.0, 1.0))
		SomeGraphNode.set_slot(2, true, 2, Color(1.0, 1.0, 0.0, 1.0), true, 1, Color(0.0, 0.0, 1.0, 1.0))
		var SomeLabel1 = Label.new()
		SomeLabel1.set_text("Slot 1")
		SomeGraphNode.add_child(SomeLabel1)
		var SomeLabel2 = Label.new()
		SomeLabel2.set_text("Slot 2")
		SomeGraphNode.add_child(SomeLabel2)
		var SomeLabel3 = Label.new()
		SomeLabel3.set_text("Slot 3")
		SomeGraphNode.add_child(SomeLabel3)
		SomeGraphNode.set_title("Node Title")
		SomeGraphEdit.add_child(SomeGraphNode)

func _node_connection_request(from, from_port, to, to_port):
	SomeGraphEdit.connect_node(from, from_port, to, to_port)

func _init():
	SomeGraphEdit = GraphEdit.new()
	SomeGraphEdit.set_name("SomeGraphEdit")
	SomeGraphEdit.set_anchor(MARGIN_RIGHT, SomeGraphEdit.ANCHOR_END, false)
	SomeGraphEdit.set_anchor(MARGIN_BOTTOM, SomeGraphEdit.ANCHOR_END, false)
	SomeGraphEdit.set_h_size_flags(3)
	SomeGraphEdit.set_v_size_flags(3)
	SomeGraphEdit.margin_top = 20
	SomeGraphEdit.margin_left = 20
	SomeGraphEdit.margin_right = -20
	SomeGraphEdit.margin_bottom = -20
	SomeGraphEdit.connect("connection_request", self, "_node_connection_request")
	
	SomePopupMenu = PopupMenu.new()
	SomePopupMenu.set_name("SomePopupMenu")
	SomePopupMenu.add_item("New")
	SomePopupMenu.add_item("Load")
	SomePopupMenu.add_item("Save")
	SomePopupMenu.add_separator()
	SomePopupMenu.add_item("Add Node")
	SomePopupMenu.add_separator()
	SomePopupMenu.add_item("Simulate")
	SomePopupMenu.add_separator()
	SomePopupMenu.add_item("Quit")
	SomePopupMenu.connect("id_pressed", self, "_menu_item_pressed")
	SomeGraphEdit.add_child(SomePopupMenu)

func _ready():
	RootNode = get_node("/root/DynamicNodeGraph")
	RootNode.add_child(SomeGraphEdit)
	SomeGraphEdit.set_scroll_ofs(Vector2(-400, -230))


func _input(event):
	if(Input.is_action_pressed("ui_up")):
		SomePopupMenu.rect_position = get_viewport().get_mouse_position()
		SomePopupMenu.popup();