pub(all) struct ScrollableElement {
  id : String
  scroll_width : Double
  scroll_height : Double
  client_width : Double
  client_height : Double
}

pub(all) struct ScrollableHitResult {
  id : String
  x : Double
  y : Double
  width : Double
  height : Double
  scroll_width : Double
  scroll_height : Double
}

fn collect_scrollable_elements(node : 
@mizchi/crater-painter/paint/model.PaintNode
PaintNode) -> Array[ScrollableElement]

fn find_scrollable_at(node : 
@mizchi/crater-painter/paint/model.PaintNode
PaintNode, x : Double, y : Double, parent_x : Double, parent_y : Double) -> ScrollableHitResult?