extends RefCounted

const HEADER_GAP: float = 16.0
const BOTTOM_MARGIN: float = 28.0


static func grid_band(header_bottom: float, panel_height: float) -> Vector2:
	var half: float = panel_height * 0.5
	if half <= 0.0:
		half = 640.0
	return Vector2(header_bottom + HEADER_GAP - half, half - BOTTOM_MARGIN)


static func grid_row_top(row: int, rows: int, row_height: float, band: Vector2,
		natural_pitch: float) -> float:
	var pitch: float = natural_pitch
	if rows > 1:
		pitch = minf(pitch, (band.y - band.x - row_height) / float(rows - 1))
	return band.x + maxf(pitch, row_height) * float(row)


static func place_entry(node: Control, cx: float, top: float, half: float,
		height: float) -> void:
	node.offset_left = cx - half
	node.offset_right = cx + half
	node.offset_top = top
	node.offset_bottom = top + height