extends Control
class_name DraggableWindow


var dragging: bool = false
var dragging_start_position: Vector2i = Vector2i()

signal on_drag(offset: Vector2i)
signal on_drop()


func _ready() -> void:
	set_process_input(true)


func _gui_input(event: InputEvent) -> void:
	if event is not InputEventMouseButton:
		return
	if event.button_index != MOUSE_BUTTON_LEFT:
		return
	
	if event.pressed:
		dragging = true
		dragging_start_position = Vector2i(get_global_mouse_position())
	else:
		dragging = false
		on_drop.emit()


func _process(_delta) -> void:
	if dragging:
		on_drag.emit(Vector2i(get_global_mouse_position()) - dragging_start_position)