module Widget
  def initialize
    @x = 0
    @y = 0
    @width = 0
    @height = 0
  end

  def children
    []
  end

  def resize(x, y, width, height)
    @x = x
    @y = y
    @width = width
    @height = height
  end

  def draw
    if @width > 0 and @height > 0
      render_begin
      render
      children.each do |child|
        child.draw
      end
      render_end
    end
  end

  def render_end
  end

  def draw_rect(x, y, width, height, r, g, b, a)
    GL.draw_rect(@x + x, @y + y, width, height, r, g, b, a)
  end
end