1. limited with Game_Views; 
  2.  
  3. package Widgets.Buttons.Toggles is 
  4.  
  5.     type Toggle_Button is new Button with private; 
  6.     type A_Toggle_Button is access all Toggle_Button'Class; 
  7.  
  8.     function Create_Toggle_Button( view : not null access Game_Views.Game_View'Class; 
  9.                                    id   : String; 
  10.                                    text : String := ""; 
  11.                                    icon : String := "" ) return A_Button; 
  12.     pragma Precondition( id'Length > 0 ); 
  13.     pragma Postcondition( Create_Toggle_Button'Result /= null ); 
  14.  
  15. private 
  16.  
  17.     type Toggle_Button is new Button with null record; 
  18.  
  19.     function Handle_Key_Press( this : access Toggle_Button; 
  20.                                evt  : not null A_Key_Event ) return Boolean; 
  21.  
  22.     procedure Handle_Mouse_Press( this : access Toggle_Button; 
  23.                                   evt  : not null A_Mouse_Button_Event ); 
  24.  
  25. end Widgets.Buttons.Toggles;