Started working on editor to create and test more complex graphs.

demo/addons/blendalot/blendalot_main_panel.gd

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+@tool
+extends Control
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass
+
+
+func _on_hit_me_button_pressed() -> void:
+	print("Hello from the main screen plugin!")

demo/addons/blendalot/blendalot_main_panel.gd.uid

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+uid://dvulvuytt81lw

demo/addons/blendalot/blendalot_main_panel.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://31c6depvs0y1"]
+
+[ext_resource type="Script" uid="uid://dvulvuytt81lw" path="res://addons/blendalot/blendalot_main_panel.gd" id="1_427jg"]
+
+[node name="BlendalotMainPanel" type="Control" unique_id=1259518158]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+size_flags_horizontal = 3
+size_flags_vertical = 3
+script = ExtResource("1_427jg")
+
+[node name="VBoxContainer" type="VBoxContainer" parent="." unique_id=2044593527]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="HitMeButton" type="Button" parent="VBoxContainer" unique_id=1060776498]
+layout_mode = 2
+size_flags_horizontal = 0
+text = "Hit me!"
+
+[node name="GraphFrame" type="GraphFrame" parent="VBoxContainer" unique_id=184673233]
+layout_mode = 2
+size_flags_vertical = 3
+
+[connection signal="pressed" from="VBoxContainer/HitMeButton" to="." method="_on_hit_me_button_pressed"]

demo/addons/blendalot/blendalot_plugin.gd

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+@tool
+extends EditorPlugin
+
+const MainPanel = preload("res://addons/blendalot/blendalot_main_panel.tscn")
+
+var main_panel_instance
+
+func _enable_plugin() -> void:
+	# Add autoloads here.
+	pass
+
+
+func _disable_plugin() -> void:
+	# Remove autoloads here.
+	pass
+
+
+func _enter_tree() -> void:
+	main_panel_instance = MainPanel.instantiate()
+	# Add the main panel to the editor's main viewport.
+	EditorInterface.get_editor_main_screen().add_child(main_panel_instance)
+	# Hide the main panel. Very much required.
+	_make_visible(false)
+
+
+func _exit_tree() -> void:
+	if main_panel_instance:
+		main_panel_instance.queue_free()
+
+
+func _has_main_screen():
+	return true
+
+
+func _make_visible(visible):
+	if main_panel_instance:
+		main_panel_instance.visible = visible
+
+
+func _get_plugin_name():
+	return "Blendalot"
+
+
+func _get_plugin_icon():
+	return EditorInterface.get_editor_theme().get_icon("Node", "EditorIcons")

demo/addons/blendalot/blendalot_plugin.gd.uid

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+uid://c33pycuedrx4n

demo/addons/blendalot/plugin.cfg

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+[plugin]
+
+name="Blendalot Animation Graphs"
+description=""
+author="Martin Felis <martin@fysx.org>"
+version="0.0.1"
+script="blendalot_plugin.gd"