Scroll down Scroll Container AFTER filling child VBox container

Help
1

Godot v4.2.1

extends CanvasLayer

signal finished_adding_texts

@onready var container = %TextContainer
@onready var scroll = %Scroll

const TEXT_CONTAINER = preload("res://_Scenes/Core/Balloon/history_text.tscn")

var history : Array = []

func _ready():
	process_mode = Node.PROCESS_MODE_ALWAYS
	get_tree().paused = true
	connect("finished_adding_texts", handle_scrollbar_changed)

func add_texts():
	if history.size() > 0:
		for i in history.size():
			print(str(i))
			var instance = TEXT_CONTAINER.instantiate()
			instance.text = history[i]
			container.add_child(instance)
		emit_signal("finished_adding_texts")
func set_texts(texts : Array):
	history = texts

func _process(_delta):
	if Input.is_action_pressed("esc"):
		get_tree().paused = false
		self.queue_free()

func _on_close_pressed():
	get_tree().paused = false
	self.queue_free()

var handle_scrollbar_changed = func():
	var scrollbar = scroll.get_v_scroll_bar()
	scrollbar.value = scrollbar.max_value

image

I’m making a visual novel, and every time a text passes it gets stored inside the history array. When I click a button a history panel opens, its a scene consisting of a scroll container, a vbox container and dynamically created labels inside the vbox container.
Everything works fine, but the thing is that when I open the history window the scrollbar stays at the start, and I want it to drop down to the last text added automatically. I want it down when the labels are all in place, and not everytime a label appears.
I tried with the code I attached and it just not works.

2

you mean the scroll container will scroll down to the bottom always whenever the history canvas is created?

if that’s the case, then just call the handle_scrollbar_changed whenever added text done?

3

I have placed the signal after adding each label and it still won’t work…


func add_texts():
	if history.size() > 0:
		for i in history.size():
			print(str(i))
			var instance = TEXT_CONTAINER.instantiate()
			instance.text = history[i]
			container.add_child(instance)
			emit_signal("finished_adding_texts")
4

this one, did it get accessed? try print() something there to confirm

5

change to
scroll.set_deferred("scroll_vertical", max_value)

6

image

Hmm, max value stays at 0 every time

7

so it could the whole texts is still inside the VBoxContainer size height

8

Try using ScrollContainer.ensure_control_visible() after adding the children to the VBoxContainer

For example:

func add_texts():
	if history.size() > 0:
		for i in history.size():
			print(str(i))
			var instance = TEXT_CONTAINER.instantiate()
			instance.text = history[i]
			container.add_child(instance)
		emit_signal("finished_adding_texts")
		await get_tree().process_frame
		scroll.ensure_control_visible(container.get_child(-1))
9

Didn’t work. It has to do with the max_value, it stays at 0 every time… let me check