ANY LAYOUT NONE
deferred class interface LINE
   -- Use line as widget (insert in container then position, draw and size
   -- are automatic). Common ancestor for HORIZONTAL_LINE and VERTICAL_LINE

feature(s) from STATE
   state: INTEGER
      -- use values from STATE_CONSTANTS

   is_state_normal: BOOLEAN

   is_state_active: BOOLEAN

   is_state_prelight: BOOLEAN

   is_state_selected: BOOLEAN

   is_state_insensitive: BOOLEAN

feature(s) from STATE
   set_state_normal

   set_state_active

   set_state_prelight

   set_state_selected

   set_state_insensitive

   set_state (n: INTEGER)

   renderer: RENDERER

feature(s) from WIDGET
   parent: CONTAINER

   pos_x: INTEGER

   pos_y: INTEGER

   x_shrink_allowed: BOOLEAN

   x_expand_allowed: BOOLEAN

   y_shrink_allowed: BOOLEAN

   y_expand_allowed: BOOLEAN

   min_width: INTEGER

   min_height: INTEGER

   std_width: INTEGER

   std_height: INTEGER

   width: INTEGER

   height: INTEGER

   valid_width (w: INTEGER): BOOLEAN

   valid_height (h: INTEGER): BOOLEAN

   area: RECT

   root_area: RECT

   computing_size: BOOLEAN

   set_x_shrink (b: BOOLEAN)

   set_x_expand (b: BOOLEAN)

   set_y_shrink (b: BOOLEAN)

   set_y_expand (b: BOOLEAN)

   set_shrink (b: BOOLEAN)
      -- change both x and y shrink state

   set_expand (b: BOOLEAN)
      -- change both x and y expand state

feature(s) from WIDGET
   expose_paint
      -- expose_paint paint with depth limited to the first window
      -- Containers have to propagate, with special
      -- attention to windows where expose_paint do nothing.

   set_geometry (x, y, w, h: INTEGER)
      require
         x >= 0;
         y >= 0;
         w >= min_width;
         h >= min_height
      ensure
         width = w;
         height = h

feature(s) from WIDGET
   set_parent (p: CONTAINER)
      require
         p = Void implies parent /= Void;
         p /= Void implies parent = Void;
         p /= Void implies p.has_child(Current)
      ensure
         parent = p

feature(s) from WIDGET
   resize (w, h: INTEGER)
      require
         w >= min_width;
         h >= min_height
      ensure
         width = w;
         height = h

feature(s) from COLOR_LIST
   white_color: COLOR

   black_color: COLOR

   dim_grey_color: COLOR

   dark_grey_color: COLOR

   grey_color: COLOR

   light_grey_color: COLOR

   dark_blue_color: COLOR

   medium_blue_color: COLOR

   blue_color: COLOR

   royal_blue_color: COLOR

   deep_sky_blue_color: COLOR

   sky_blue_color: COLOR

   light_sky_blue_color: COLOR

   steel_blue_color: COLOR

   light_steel_blue_color: COLOR

   light_blue_color: COLOR

   pale_turquoise_color: COLOR

   dark_turquoise_color: COLOR

   medium_turquoise_color: COLOR

   turquoise_color: COLOR

   dark_cyan_color: COLOR

   cyan_color: COLOR

   light_cyan_color: COLOR

   dark_green_color: COLOR

   green_color: COLOR

   light_green_color: COLOR

   yellow_green_color: COLOR

   dark_khaki_color: COLOR

   khaki_color: COLOR

   yellow_color: COLOR

   light_yellow_color: COLOR

   gold_color: COLOR

   beige_color: COLOR

   chocolate_color: COLOR

   firebrick_color: COLOR

   brown_color: COLOR

   dark_salmon_color: COLOR

   salmon_color: COLOR

   light_salmon_color: COLOR

   dark_orange_color: COLOR

   orange_color: COLOR

   orange_red_color: COLOR

   dark_red_color: COLOR

   red_color: COLOR

   hot_pink_color: COLOR

   deep_pink_color: COLOR

   pink_color: COLOR

   light_pink_color: COLOR

   pale_violet_red_color: COLOR

   maroon_color: COLOR

   medium_violet_red_color: COLOR

   violet_red_color: COLOR

   violet_color: COLOR

   dark_magenta_color: COLOR

   magenta_color: COLOR

   dark_violet_color: COLOR

   blue_violet_color: COLOR

   medium_purple_color: COLOR

   purple_color: COLOR

feature(s) from STATE_CONSTANTS
   state_normal: INTEGER

   state_active: INTEGER

   state_prelight: INTEGER

   state_selected: INTEGER

   state_insensitive: INTEGER

feature(s) from ALIGNMENT_CONSTANTS
   center_alignment: ALIGNMENT

   left_alignment: ALIGNMENT

   right_alignment: ALIGNMENT

   top_alignment: ALIGNMENT

   down_alignment: ALIGNMENT

   top_left_alignment: ALIGNMENT

   top_right_alignment: ALIGNMENT

   down_right_alignment: ALIGNMENT

   down_left_alignment: ALIGNMENT

feature(s) from GRAPHIC
   vision: VISION

   font_manager: FONT_MANAGER

   default_font: BASIC_FONT

feature(s) from LINE
   thickness: INTEGER

   style: DRAW_STYLE

   set_thickness (thick: INTEGER)
      -- Set the thickness of the line (drawing' witdh)
      require
         thick > 0
      ensure
         thick = thickness

   set_style (s: DRAW_STYLE)
      -- Change the style used to draw the line.
      -- NOTE: The screen is not updated. --TODO: change this ?
      ensure
         style = s

   reset_default_style
      -- The renderer will be used to draw the line.
      -- NOTE: The screen is not updated. --TODO: change this ?


invariant

    width >= min_width or computing_size;

    height >= min_height or computing_size;

    std_width > 0;

    std_height > 0;

    (not x_shrink_allowed implies width >= std_width) or computing_size;

    (not x_expand_allowed implies width <= std_width) or computing_size;

    (not y_shrink_allowed implies height >= std_height) or computing_size;

    (not y_expand_allowed implies height <= std_height) or computing_size;

end of deferred LINE