module QDA::GUI
  # A control which has multiple different forms which can be shown or hidden
  class MultiTypedControl < Wx::BoxSizer
    # controls is an array of all the individual controls contained in this
    # swapper
    # visible is the index of currently visible control
    attr_reader :controls, :visible

    # 
    def initialize( first_item )
      super(Wx::HORIZONTAL)
      @visible  = 0
      @controls = [ first_item ]
      add(first_item, 1, Wx::ALIGN_CENTRE_VERTICAL)
    end
    
    def add_control(control)
      controls.push(control)
      control.hide()
    end

    def add_duplicate(control)
      controls.push(control)
    end

    def visible_item()
      controls[visible]
    end

    def show(i)
      return if i == visible
      if i < 0 or i >= controls.length
        raise ArgumentError, "Bad Index"
      end
      visible_item.hide()
      detach(visible_item)
      @visible = i
      add(visible_item, 1, Wx::ALIGN_CENTRE_VERTICAL)
      visible_item.show()
      layout()    
    end
  end
end