Add a widget to switch between BlockCode nodes

addons/block_code/block_code_plugin.gd

@@ -96,13 +96,19 @@ func _exit_tree():
 
 
 func _ready():
+	connect("scene_changed", _on_scene_changed)
 	editor_inspector.connect("edited_object_changed", _on_editor_inspector_edited_object_changed)
+	_on_scene_changed(EditorInterface.get_edited_scene_root())
+	_on_editor_inspector_edited_object_changed()
+
+
+func _on_scene_changed(scene_root: Node):
+	BlockCodePlugin.main_panel.switch_scene(scene_root)
 
 
 func _on_editor_inspector_edited_object_changed():
 	var block_code: BlockCode = editor_inspector.get_edited_object() as BlockCode
-	if block_code:
-		BlockCodePlugin.main_panel.switch_script(block_code)
+	BlockCodePlugin.main_panel.switch_script(block_code)
 
 
 func _has_main_screen():

addons/block_code/ui/block_canvas/block_canvas.gd

@@ -6,6 +6,8 @@ const EXTEND_MARGIN: float = 800
 
 @onready var _window: Control = %Window
 @onready var _window_scroll: ScrollContainer = %WindowScroll
+@onready var _choose_block_code_label: Label = %ChooseBlockCodeLabel
+@onready var _create_block_code_label: Label = %CreateBlockCodeLabel
 
 var _block_scenes_by_class = {}
 
@@ -41,10 +43,27 @@ func set_child(n: Node):
 func bsd_selected(bsd: BlockScriptData):
 	clear_canvas()
 
+	_choose_block_code_label.visible = false
+	_create_block_code_label.visible = false
+
+	if not bsd and scene_has_bsd_nodes():
+		_choose_block_code_label.visible = true
+		return
+	elif not bsd and not scene_has_bsd_nodes():
+		_create_block_code_label.visible = true
+		return
+
 	for tree in bsd.block_trees.array:
 		load_tree(_window, tree)
 
 
+func scene_has_bsd_nodes() -> bool:
+	var scene_root = EditorInterface.get_edited_scene_root()
+	if not scene_root:
+		return false
+	return scene_root.find_children("*", "BlockCode").size() > 0
+
+
 func clear_canvas():
 	for child in _window.get_children():
 		child.queue_free()

addons/block_code/ui/block_canvas/block_canvas.tscn

@@ -24,3 +24,17 @@ unique_name_in_owner = true
 layout_mode = 2
 size_flags_horizontal = 3
 mouse_filter = 1
+
+[node name="ChooseBlockCodeLabel" type="Label" parent="."]
+unique_name_in_owner = true
+visible = false
+layout_mode = 2
+text = "Choose a BlockCode node in the inspector."
+horizontal_alignment = 1
+
+[node name="CreateBlockCodeLabel" type="Label" parent="."]
+unique_name_in_owner = true
+visible = false
+layout_mode = 2
+text = "First, add a BlockCode node to the scene."
+horizontal_alignment = 1

addons/block_code/ui/main_panel.gd

@@ -8,10 +8,13 @@ var eia: EditorInterfaceAccess
 @onready var _block_canvas: BlockCanvas = %NodeBlockCanvas
 @onready var _drag_manager: DragManager = %DragManager
 @onready var _title_bar: TitleBar = %TitleBar
+@onready var _editor_inspector: EditorInspector = EditorInterface.get_inspector()
 
 var block_code_tab: Button
 var _current_bsd: BlockScriptData
 var _current_block_code_node: BlockCode
+var _scene_root: Node
+var _block_code_nodes: Array
 
 var undo_redo: EditorUndoRedoManager
 
@@ -32,17 +35,18 @@ func _on_button_pressed():
 	_print_generated_script()
 
 
+func switch_scene(scene_root: Node):
+	_title_bar.scene_selected(scene_root)
+
+
 func switch_script(block_code_node: BlockCode):
-	var bsd = block_code_node.bsd
-	if bsd:
-		_current_bsd = bsd
-		_current_block_code_node = block_code_node
-		_picker.bsd_selected(bsd)
-		_title_bar.bsd_selected(bsd)
-		_block_canvas.bsd_selected(bsd)
-		block_code_tab.pressed.emit()
-	else:
-		print("No block script attached.")
+	var bsd = block_code_node.bsd if block_code_node else null
+	_current_bsd = bsd
+	_current_block_code_node = block_code_node
+	_picker.bsd_selected(bsd)
+	_title_bar.bsd_selected(bsd)
+	_block_canvas.bsd_selected(bsd)
+	block_code_tab.pressed.emit()
 
 
 func save_script():

addons/block_code/ui/picker/picker.gd

@@ -8,6 +8,10 @@ signal block_picked(block: Block)
 
 
 func bsd_selected(bsd: BlockScriptData):
+	if not bsd:
+		reset_picker()
+		return
+
 	for class_dict in ProjectSettings.get_global_class_list():
 		if class_dict.class == bsd.script_inherits:
 			var script = load(class_dict.path)
@@ -19,10 +23,14 @@ func bsd_selected(bsd: BlockScriptData):
 	init_picker(CategoryFactory.get_inherited_categories(bsd.script_inherits))
 
 
-func init_picker(extra_blocks: Array[BlockCategory] = []):
+func reset_picker():
 	for c in _block_list.get_children():
 		c.queue_free()
 
+
+func init_picker(extra_blocks: Array[BlockCategory] = []):
+	reset_picker()
+
 	var block_categories := CategoryFactory.get_general_categories()
 
 	if extra_blocks.size() > 0:

addons/block_code/ui/title_bar/title_bar.gd

@@ -4,19 +4,65 @@ extends MarginContainer
 
 signal node_name_changed(node_name: String)
 
-@onready var _node_name := %NodeName
-@onready var _class_name := %ClassName
+@onready var _block_code_icon = load("res://addons/block_code/block_code_node/block_code_node.svg") as Texture2D
+@onready var _editor_inspector: EditorInspector = EditorInterface.get_inspector()
+@onready var _editor_selection: EditorSelection = EditorInterface.get_selection()
+@onready var _node_option_button: OptionButton = %NodeOptionButton
+
+
+func _ready():
+	_node_option_button.connect("item_selected", _on_node_option_button_item_selected)
+
+
+func scene_selected(scene_root: Node):
+	_update_node_option_button_options()
+	var current_block_code = _editor_inspector.get_edited_object() as BlockCode
+	if not current_block_code:
+		bsd_selected(null)
 
 
 func bsd_selected(bsd: BlockScriptData):
-	_class_name.text = bsd.script_inherits
+	# TODO: We should listen for property changes in all BlockCode nodes and
+	#       their parents. As a workaround for the UI displaying stale data,
+	#       we'll crudely update the list of BlockCode nodes whenever the
+	#       selection changes.
+
+	_update_node_option_button_options()
+
+	var select_index = _get_index_for_bsd(bsd)
+	if _node_option_button.selected != select_index:
+		_node_option_button.select(select_index)
+
+
+func _update_node_option_button_options():
+	_node_option_button.clear()
+
+	var scene_root = EditorInterface.get_edited_scene_root()
+
+	if not scene_root:
+		return
+
+	for block_code_node in scene_root.find_children("*", "BlockCode"):
+		var node_item_index = _node_option_button.item_count
+		var node_label = "{name} ({type})".format({"name": scene_root.get_path_to(block_code_node).get_concatenated_names(), "type": block_code_node.bsd.script_inherits})
+		_node_option_button.add_item(node_label)
+		_node_option_button.set_item_icon(node_item_index, _block_code_icon)
+		_node_option_button.set_item_metadata(node_item_index, block_code_node)
 
 
-#func node_selected(node_data: NodeData):
-#_node_name.text = node_data.node_name
-#_class_name.text = node_data.node_class_name
+func _get_index_for_bsd(bsd: BlockScriptData) -> int:
+	for index in range(_node_option_button.item_count):
+		var block_code_node = _node_option_button.get_item_metadata(index)
+		if block_code_node.bsd == bsd:
+			return index
+	return -1
 
 
-func _on_node_name_text_changed(new_text: String):
-	#node_name_changed.emit(new_text)
-	pass
+func _on_node_option_button_item_selected(index):
+	var block_code_node = _node_option_button.get_item_metadata(index) as BlockCode
+	# FIXME: We should clear the existing selection, but at the moment this
+	#        causes the new node to be deselected due to signal handlers being
+	#        called in the wrong order.
+	#_editor_selection.clear()
+	if block_code_node:
+		EditorInterface.edit_node(block_code_node)

addons/block_code/ui/title_bar/title_bar.tscn

@@ -14,15 +14,7 @@ layout_mode = 2
 [node name="HBoxContainer" type="HBoxContainer" parent="."]
 layout_mode = 2
 
-[node name="NodeName" type="LineEdit" parent="HBoxContainer"]
+[node name="NodeOptionButton" type="OptionButton" parent="HBoxContainer"]
 unique_name_in_owner = true
-custom_minimum_size = Vector2(400, 0)
 layout_mode = 2
-editable = false
-
-[node name="ClassName" type="Label" parent="HBoxContainer"]
-unique_name_in_owner = true
-layout_mode = 2
-theme_override_colors/font_color = Color(0.501407, 0.501406, 0.501406, 1)
-
-[connection signal="text_changed" from="HBoxContainer/NodeName" to="." method="_on_node_name_text_changed"]
+size_flags_horizontal = 3