release/src/router/libncurses/Ada95/samples/sample-function_key_setting.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                       GNAT ncurses Binding Samples                       --
   4 --                                                                          --
   5 --                         Sample.Function_Key_Setting                      --
   6 --                                                                          --
   7 --                                 B O D Y                                  --
   8 --                                                                          --
   9 ------------------------------------------------------------------------------
  10 -- Copyright (c) 1998-2009,2011 Free Software Foundation, Inc.              --
  11 --                                                                          --
  12 -- Permission is hereby granted, free of charge, to any person obtaining a  --
  13 -- copy of this software and associated documentation files (the            --
  14 -- "Software"), to deal in the Software without restriction, including      --
  15 -- without limitation the rights to use, copy, modify, merge, publish,      --
  16 -- distribute, distribute with modifications, sublicense, and/or sell       --
  17 -- copies of the Software, and to permit persons to whom the Software is    --
  18 -- furnished to do so, subject to the following conditions:                 --
  19 --                                                                          --
  20 -- The above copyright notice and this permission notice shall be included  --
  21 -- in all copies or substantial portions of the Software.                   --
  22 --                                                                          --
  23 -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  --
  24 -- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               --
  25 -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   --
  26 -- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   --
  27 -- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    --
  28 -- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    --
  29 -- THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               --
  30 --                                                                          --
  31 -- Except as contained in this notice, the name(s) of the above copyright   --
  32 -- holders shall not be used in advertising or otherwise to promote the     --
  33 -- sale, use or other dealings in this Software without prior written       --
  34 -- authorization.                                                           --
  35 ------------------------------------------------------------------------------
  36 --  Author:  Juergen Pfeifer, 1996
  37 --  Version Control
  38 --  $Revision: 1.15 $
  39 --  $Date: 2011/03/23 00:44:12 $
  40 --  Binding Version 01.00
  41 ------------------------------------------------------------------------------
  42 with Ada.Unchecked_Deallocation;
  43 with Sample.Manifest; use  Sample.Manifest;
  44
  45 --  This package implements a simple stack of function key label environments.
  46 --
  47 package body Sample.Function_Key_Setting is
  48
  49    Max_Label_Length : constant Positive := 8;
  50    Number_Of_Keys   : Label_Number := Label_Number'Last;
  51    Justification    : Label_Justification := Left;
  52
  53    subtype Label is String (1 .. Max_Label_Length);
  54    type Label_Array is array (Label_Number range <>) of Label;
  55
  56    type Key_Environment (N : Label_Number := Label_Number'Last);
  57    type Env_Ptr is access Key_Environment;
  58    pragma Controlled (Env_Ptr);
  59
  60    type String_Access is access String;
  61    pragma Controlled (String_Access);
  62
  63    Active_Context : String_Access := new String'("MAIN");
  64    Active_Notepad : Panel := Null_Panel;
  65
  66    type Key_Environment  (N : Label_Number := Label_Number'Last) is
  67       record
  68          Prev    : Env_Ptr;
  69          Help    : String_Access;
  70          Notepad : Panel;
  71          Labels  : Label_Array (1 .. N);
  72       end record;
  73
  74    procedure Release_String is
  75      new Ada.Unchecked_Deallocation (String,
  76                                      String_Access);
  77
  78    procedure Release_Environment is
  79       new Ada.Unchecked_Deallocation (Key_Environment,
  80                                       Env_Ptr);
  81
  82    Top_Of_Stack : Env_Ptr := null;
  83
  84    procedure Push_Environment (Key   : String;
  85                                Reset : Boolean := True)
  86    is
  87       P : constant Env_Ptr := new Key_Environment (Number_Of_Keys);
  88    begin
  89       --  Store the current labels in the environment
  90       for I in 1 .. Number_Of_Keys loop
  91          Get_Soft_Label_Key (I, P.all.Labels (I));
  92          if Reset then
  93             Set_Soft_Label_Key (I, " ");
  94          end if;
  95       end loop;
  96       P.all.Prev := Top_Of_Stack;
  97       --  now store active help context and notepad
  98       P.all.Help := Active_Context;
  99       P.all.Notepad := Active_Notepad;
 100       --  The notepad must now vanish and the new notepad is empty.
 101       if P.all.Notepad /= Null_Panel then
 102          Hide (P.all.Notepad);
 103          Update_Panels;
 104       end if;
 105       Active_Notepad := Null_Panel;
 106       Active_Context := new String'(Key);
 107
 108       Top_Of_Stack := P;
 109       if Reset then
 110          Refresh_Soft_Label_Keys_Without_Update;
 111       end if;
 112    end Push_Environment;
 113
 114    procedure Pop_Environment
 115    is
 116       P : Env_Ptr := Top_Of_Stack;
 117    begin
 118       if Top_Of_Stack = null then
 119          raise Function_Key_Stack_Error;
 120       else
 121          for I in 1 .. Number_Of_Keys loop
 122             Set_Soft_Label_Key (I, P.all.Labels (I), Justification);
 123          end loop;
 124          pragma Assert (Active_Context /= null);
 125          Release_String (Active_Context);
 126          Active_Context := P.all.Help;
 127          Refresh_Soft_Label_Keys_Without_Update;
 128          Notepad_To_Context (P.all.Notepad);
 129          Top_Of_Stack := P.all.Prev;
 130          Release_Environment (P);
 131       end if;
 132    end Pop_Environment;
 133
 134    function Context return String
 135    is
 136    begin
 137       if Active_Context /= null then
 138          return Active_Context.all;
 139       else
 140          return "";
 141       end if;
 142    end Context;
 143
 144    function Find_Context (Key : String) return Boolean
 145    is
 146       P : Env_Ptr := Top_Of_Stack;
 147    begin
 148       if Active_Context.all = Key then
 149          return True;
 150       else
 151          loop
 152             exit when P = null;
 153             if P.all.Help.all = Key then
 154                return True;
 155             else
 156                P := P.all.Prev;
 157             end if;
 158          end loop;
 159          return False;
 160       end if;
 161    end Find_Context;
 162
 163    procedure Notepad_To_Context (Pan : Panel)
 164    is
 165       W : Window;
 166    begin
 167       if Active_Notepad /= Null_Panel then
 168          W := Get_Window (Active_Notepad);
 169          Clear (W);
 170          Delete (Active_Notepad);
 171          Delete (W);
 172       end if;
 173       Active_Notepad := Pan;
 174       if Pan /= Null_Panel then
 175          Top  (Pan);
 176       end if;
 177       Update_Panels;
 178       Update_Screen;
 179    end Notepad_To_Context;
 180
 181    procedure Initialize (Mode : Soft_Label_Key_Format := PC_Style;
 182                          Just : Label_Justification := Left)
 183    is
 184    begin
 185       case Mode is
 186          when PC_Style .. PC_Style_With_Index
 187            => Number_Of_Keys := 12;
 188          when others
 189            => Number_Of_Keys := 8;
 190       end case;
 191       Init_Soft_Label_Keys (Mode);
 192       Justification := Just;
 193    end Initialize;
 194
 195    procedure Default_Labels
 196    is
 197    begin
 198       Set_Soft_Label_Key (FKEY_QUIT, "Quit");
 199       Set_Soft_Label_Key (FKEY_HELP, "Help");
 200       Set_Soft_Label_Key (FKEY_EXPLAIN, "Keys");
 201       Refresh_Soft_Label_Keys_Without_Update;
 202    end Default_Labels;
 203
 204    function Notepad_Window return Window
 205    is
 206    begin
 207       if Active_Notepad /= Null_Panel then
 208          return Get_Window (Active_Notepad);
 209       else
 210          return Null_Window;
 211       end if;
 212    end Notepad_Window;
 213
 214 end Sample.Function_Key_Setting;