class_name DrawController extends Control

## Emitted the frame after at least one paint operation was done.
signal painted

var _draw_queue: Array[Callable] = []

var _dirty := false


func clear(color: Color) -> void:
	queue_draw(func() -> void: draw_rect(Rect2(0, 0, size.x, size.y), color, true))


func queue_draw(op: Callable) -> void:
	_draw_queue.push_back(op)
	_dirty = true


func _draw() -> void:
	while _draw_queue:
		var op: Callable = _draw_queue.pop_front()
		op.call()


func _process(_delta: float) -> void:
	if _dirty:
		queue_redraw()
		_dirty = false
		painted.emit()