class interface OK_BUTTON

creation
   make (p: WINDOW)
      --  Create the button.

      require
         valid_parent: p /= Void

feature(s) from CONTROL
   --  Implementation

   self: CHILD_WINDOW
      --  Associated child window.


feature(s) from CONTROL
   --  Dialog box

   has_dialog_box: BOOLEAN
      --  Check if control has associated dialog box.


   dialog_box: DIALOG
      --  Associated dialog which holds the control.

      require
         has_dialog: has_dialog_box
      ensure
         valid: Result /= Void

feature(s) from CONTROL
   --  Control's font

   set_font (ft: FONT)
      --  Set control font.

      require
         valid_font: ft /= Void

feature(s) from CONTROL
   --  Position, independent

   indep_size: RECTANGLE
      --  Control size using dialog coordinates.

      ensure
         is_copy:  --  can be modified.

   indep_set_size (sz: RECTANGLE)
      --  Set control size using dialog coordinates.

      require
         valid: sz /= Void
      ensure
         done: sz.is_equal(indep_size)

feature(s) from DIALOG_ELEMENT
   --  Device independent positioning

   indep_set_point (p: POINT)
      --  Set upper-left point of element using device independent units.

      require
         valid_point: p /= Void

   indep_set_width (wi: INTEGER)
      --  Set element's width using device independent units.

      require
         valid: wi >= 0

   indep_set_height (he: INTEGER)
      --  Set element's height using device independent units.

      require
         valid: he >= 0

feature(s) from DIALOG_ELEMENT
   --  Relative positioning

   place_right (other: DIALOG_ELEMENT)
      --  Place the current element to the right of other.

      require
         valid_other: other /= Void

   place_left (other: DIALOG_ELEMENT)
      --  Place the current element to the left of other.

      require
         valid_other: other /= Void

   place_above (other: DIALOG_ELEMENT)
      --  Place the current element above other.

      require
         valid_other: other /= Void

   place_under (other: DIALOG_ELEMENT)
      --  Place the current element under other.

      require
         valid_other: other /= Void

   place_just_under (other: DIALOG_ELEMENT)
      --  Place the current element exactly under 'other'.


   same_width (other: DIALOG_ELEMENT)
      --  Set the current element width to other's.

      require
         valid_other: other /= Void

   same_height (other: DIALOG_ELEMENT)
      --  Set the current element height to be the same as other's.

      require
         valid_other: other /= Void

   align_left (other: DIALOG_ELEMENT)
      --  Align left side of this element with the 
      --  left side of other.

      require
         ok: other /= Void

   align_right (other: DIALOG_ELEMENT)
      --  Align the right side of this element with the right 
      --  side of other.

      require
         ok: other /= Void

   align_top (other: DIALOG_ELEMENT)
      --  Align the top of this element with top of other.

      require
         ok: other /= Void

   align_bottom (other: DIALOG_ELEMENT)
      --  Align the bottom of this element with bottom of other.

      require
         ok: other /= Void

feature(s) from BUTTON
   --  Status

   set_label (str: STRING)
      --  Set button label.

      require
         valid: str /= Void

feature(s) from BUTTON
   --  Command

   set_command (gc: GUI_COMMAND)
      --  Set when_executed command.

      require
         nothing:  --  Void means no command
      ensure
         keep_reference: command = gc

feature(s) from PUSH_BUTTON
   --  Status

   is_down: BOOLEAN
      --  Is the button down?


   set_down (stat: BOOLEAN)
      --  Not implemented.

      ensure
         not_implemented: false;
         set: is_down = stat

feature(s) from PUSH_BUTTON
   --  Positioning

   center
      --  Place button at the centre of the dialog (as 
      --  it would be when optimally arranged).

      require
         db: has_dialog_box

   left_of_center
      --  Place button at the left of the centre of the 
      --  dialog (as it would be when optimally arranged).

      require
         db: has_dialog_box

   right_of_center
      --  Place button at the right of the centre of the 
      --  dialog (as it would be when optimaly arranged).

      require
         db: has_dialog_box

feature(s) from PUSH_BUTTON
   --  Default status

   is_default: BOOLEAN
      --  Is the button a default push button?


   set_default (def: BOOLEAN)
      --  Set the button to default push button status (thick border).

      ensure
         done: def = is_default

feature(s) from PUSH_BUTTON
   --  Command

   execute
      --  Simulate button selection.


invariant
   has_dialog: has_dialog_box;

end of OK_BUTTON