extends ScrollContainer

var isDrag = false
var startPos = 0
var dragDir = 0

func _ready():
	set_process_input(false)

func _input(event):
	if event is InputEventMouseButton:
		if event.button_index != BUTTON_LEFT:
			return
		if event.is_pressed():
			isDrag = true
			startPos = event.position.y
		if  !event.is_pressed():
			isDrag = false
			startPos = 0
	if event is InputEventMouseMotion and isDrag:
		var offset = event.position.y - startPos
		self.scroll_vertical -= offset
		startPos = event.position.y

func _on_BookDialog_popup_hide():
	set_process_input(false)