End of chapter 6. A lot of problems took to much time to solve. It was good to know better Godot internal mechanism.

scripts/ui/Message Console.gd

@@ -0,0 +1,63 @@
+extends MarginContainer
+
+@export var scrollContainer:ScrollContainer
+@export var messages:VBoxContainer
+@export var messageHistory := 10
+
+var messageLinePrefab = preload("res://scenes/ui/MessageLine.tscn")
+
+func _ready():
+	CommandDispatcher.DISPLAY_MESSAGE.connect(_onMessageReceived)
+	CommandDispatcher.DISPLAY_COMMAND_PROMPT.connect(displayCommandPrompt)
+	CommandDispatcher.DISPLAY_CLEAR.connect(clearWindow)
+
+func _on_command(text):
+	displayCommand(text)
+
+
+func _onMessageReceived(message):
+	displayMessage(message)
+
+
+func displayCommandPrompt():
+	messages.add_child(messageLinePrefab.instantiate())
+
+
+func clearWindow():
+	for item in messages.get_children():
+		messages.remove_child(item)
+		item.queue_free()
+
+
+func scrollToEnd():
+	await scrollContainer.get_v_scroll_bar().changed
+	
+	if (messages.get_child_count() > messageHistory):
+		messages.get_child(0).queue_free()
+	
+	scrollContainer.scroll_vertical = scrollContainer.get_v_scroll_bar().max_value
+
+
+func displayMessage(message):
+	
+	var messageLine = messageLinePrefab.instantiate()
+	
+	messageLine.text = "%s\n" % message
+	
+	messages.add_child(messageLine)
+
+	scrollToEnd()
+
+
+func displayCommand(message):
+	
+	var currentMessageLine:RichTextLabel
+	
+	if (messages.get_child_count() == 0):
+		displayCommandPrompt()
+	
+	currentMessageLine = messages.get_children()[messages.get_children().size() - 1]
+	
+	currentMessageLine.text = currentMessageLine.text.insert(currentMessageLine.text.length() - 2, message)
+	
+	scrollToEnd()

scripts/ui/Message Console.gd.uid

@@ -0,0 +1 @@
+uid://dv3fd112uj8o1

scripts/ui/loading_screen.gd

@@ -1,11 +1,11 @@
 extends Control
 
-@export var loadingBar: TextureProgressBar
+@export var loadingBar:TextureProgressBar
 
 # Called when the node enters the scene tree for the first time.
-func _ready() -> void:
+func _ready():
 	Loader.LOADING_PROGRESS_UPDATED.connect(_on_progress_updated)
 
 
-func _on_progress_updated(percentage: float) -> void:
-	loadingBar.value = percentage
+func _on_progress_updated(percentage):
+	loadingBar.value = percentage * 100