extends ScrollContainer


onready var up_arrow: TextureRect = $"%UpArrow"
onready var down_arrow: TextureRect = $"%DownArrow"
onready var controls_v_box: VBoxContainer = $"%ControlsVBox"


func _ready() -> void:
	yield(get_tree(), "idle_frame")
	get_viewport().connect("gui_focus_changed", self, "_on_focus_changed")
	connect("visibility_changed", self, "_on_visibility_changed")


func _exit_tree() -> void:
	get_viewport().disconnect("gui_focus_changed", self, "_on_focus_changed")


func _on_focus_changed(focused: Control) -> void:
	if is_a_parent_of(focused):
		var foc_rect := focused.get_global_rect()
		if not get_global_rect().encloses(foc_rect):
			var direction := sign(foc_rect.position.y - get_global_rect().position.y)
			scroll_vertical += direction * 14.0
		
		if scroll_vertical < 1.0:
			up_arrow.visible = false
		else:
			up_arrow.visible = true
		
		if scroll_vertical > 35.0:
			down_arrow.visible = false
		else:
			down_arrow.visible = true


func _on_visibility_changed() -> void:
	scroll_vertical = 0.0
	up_arrow.visible = false