release/src/router/libncurses/Ada95/samples/sample-form_demo-aux.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                       GNAT ncurses Binding Samples                       --
   4 --                                                                          --
   5 --                            Sample.Form_Demo.Aux                          --
   6 --                                                                          --
   7 --                                 B O D Y                                  --
   8 --                                                                          --
   9 ------------------------------------------------------------------------------
  10 -- Copyright (c) 1998-2004,2009 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: 1.17 $
  39 --  $Date: 2009/12/26 17:38:58 $
  40 --  Binding Version 01.00
  41 ------------------------------------------------------------------------------
  42 with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;
  43
  44 with Sample.Manifest; use Sample.Manifest;
  45 with Sample.Helpers; use Sample.Helpers;
  46 with Sample.Keyboard_Handler; use Sample.Keyboard_Handler;
  47 with Sample.Explanation; use Sample.Explanation;
  48
  49 package body Sample.Form_Demo.Aux is
  50
  51    procedure Geometry (F  : Form;
  52                        L  : out Line_Count;        -- Lines used for menu
  53                        C  : out Column_Count;      -- Columns used for menu
  54                        Y  : out Line_Position;     -- Proposed Line for menu
  55                        X  : out Column_Position)   -- Proposed Column for menu
  56    is
  57    begin
  58       Scale (F, L, C);
  59
  60       L := L + 2;  -- count for frame at top and bottom
  61       C := C + 2;  -- "
  62
  63       --  Calculate horizontal coordinate at the screen center
  64       X := (Columns - C) / 2;
  65       Y := 1; -- start always in line 1
  66    end Geometry;
  67
  68    function Create (F     : Form;
  69                     Title : String;
  70                     Lin   : Line_Position;
  71                     Col   : Column_Position) return Panel
  72    is
  73       W, S : Window;
  74       L : Line_Count;
  75       C : Column_Count;
  76       Y : Line_Position;
  77       X : Column_Position;
  78       Pan : Panel;
  79    begin
  80       Geometry (F, L, C, Y, X);
  81       W := New_Window (L, C, Lin, Col);
  82       Set_Meta_Mode (W);
  83       Set_KeyPad_Mode (W);
  84       if Has_Colors then
  85          Set_Background (Win => W,
  86                          Ch  => (Ch    => ' ',
  87                                  Color => Default_Colors,
  88                                  Attr  => Normal_Video));
  89          Set_Character_Attributes (Win => W,
  90                                    Color => Default_Colors,
  91                                    Attr  => Normal_Video);
  92          Erase (W);
  93       end if;
  94       S := Derived_Window (W, L - 2, C - 2, 1, 1);
  95       Set_Meta_Mode (S);
  96       Set_KeyPad_Mode (S);
  97       Box (W);
  98       Set_Window (F, W);
  99       Set_Sub_Window (F, S);
 100       if Title'Length > 0 then
 101          Window_Title (W, Title);
 102       end if;
 103       Pan := New_Panel (W);
 104       Post (F);
 105       return Pan;
 106    end Create;
 107
 108    procedure Destroy (F : Form;
 109                       P : in out Panel)
 110    is
 111       W, S : Window;
 112    begin
 113       W := Get_Window (F);
 114       S := Get_Sub_Window (F);
 115       Post (F, False);
 116       Erase (W);
 117       Delete (P);
 118       Set_Window (F, Null_Window);
 119       Set_Sub_Window (F, Null_Window);
 120       Delete (S);
 121       Delete (W);
 122       Update_Panels;
 123    end Destroy;
 124
 125    function Get_Request (F           : Form;
 126                          P           : Panel;
 127                          Handle_CRLF : Boolean := True) return Key_Code
 128    is
 129       W  : constant Window := Get_Window (F);
 130       K  : Real_Key_Code;
 131       Ch : Character;
 132    begin
 133       Top (P);
 134       loop
 135          K := Get_Key (W);
 136          if K in Special_Key_Code'Range then
 137             case K is
 138                when HELP_CODE             => Explain_Context;
 139                when EXPLAIN_CODE          => Explain ("FORMKEYS");
 140                when Key_Home              => return F_First_Field;
 141                when Key_End               => return F_Last_Field;
 142                when QUIT_CODE             => return QUIT;
 143                when Key_Cursor_Down       => return F_Down_Char;
 144                when Key_Cursor_Up         => return F_Up_Char;
 145                when Key_Cursor_Left       => return F_Previous_Char;
 146                when Key_Cursor_Right      => return F_Next_Char;
 147                when Key_Next_Page         => return F_Next_Page;
 148                when Key_Previous_Page     => return F_Previous_Page;
 149                when Key_Backspace         => return F_Delete_Previous;
 150                when Key_Clear_Screen      => return F_Clear_Field;
 151                when Key_Clear_End_Of_Line => return F_Clear_EOF;
 152                when others                => return K;
 153             end case;
 154          elsif K in Normal_Key_Code'Range then
 155             Ch := Character'Val (K);
 156             case Ch is
 157                when CAN => return QUIT;                  -- CTRL-X
 158
 159                when ACK => return F_Next_Field;          -- CTRL-F
 160                when STX => return F_Previous_Field;      -- CTRL-B
 161                when FF  => return F_Left_Field;          -- CTRL-L
 162                when DC2 => return F_Right_Field;         -- CTRL-R
 163                when NAK => return F_Up_Field;            -- CTRL-U
 164                when EOT => return F_Down_Field;          -- CTRL-D
 165
 166                when ETB => return F_Next_Word;           -- CTRL-W
 167                when DC4 => return F_Previous_Word;       -- CTRL-T
 168
 169                when SOH => return F_Begin_Field;         -- CTRL-A
 170                when ENQ => return F_End_Field;           -- CTRL-E
 171
 172                when HT  => return F_Insert_Char;         -- CTRL-I
 173                when SI  => return F_Insert_Line;         -- CTRL-O
 174                when SYN => return F_Delete_Char;         -- CTRL-V
 175                when BS  => return F_Delete_Previous;     -- CTRL-H
 176                when EM  => return F_Delete_Line;         -- CTRL-Y
 177                when BEL => return F_Delete_Word;         -- CTRL-G
 178                when VT  => return F_Clear_EOF;           -- CTRL-K
 179
 180                when SO  => return F_Next_Choice;         -- CTRL-N
 181                when DLE => return F_Previous_Choice;     -- CTRL-P
 182
 183                when CR | LF  =>
 184                   if Handle_CRLF then
 185                      return F_New_Line;
 186                   else
 187                      return K;
 188                   end if;
 189                when others => return K;
 190             end case;
 191          else
 192             return K;
 193          end if;
 194       end loop;
 195    end Get_Request;
 196
 197    function Make (Top         : Line_Position;
 198                   Left        : Column_Position;
 199                   Text        : String) return Field
 200    is
 201       Fld : Field;
 202       C : constant Column_Count := Column_Count (Text'Length);
 203    begin
 204       Fld := New_Field (1, C, Top, Left);
 205       Set_Buffer (Fld, 0, Text);
 206       Switch_Options (Fld, (Active => True, others => False), False);
 207       if Has_Colors then
 208          Set_Background (Fld => Fld, Color => Default_Colors);
 209       end if;
 210       return Fld;
 211    end Make;
 212
 213    function Make  (Height      : Line_Count := 1;
 214                    Width       : Column_Count;
 215                    Top         : Line_Position;
 216                    Left        : Column_Position;
 217                    Off_Screen  : Natural := 0) return Field
 218    is
 219       Fld : constant Field := New_Field (Height, Width, Top, Left, Off_Screen);
 220    begin
 221       if Has_Colors then
 222          Set_Foreground (Fld => Fld, Color => Form_Fore_Color);
 223          Set_Background (Fld => Fld, Color => Form_Back_Color);
 224       else
 225          Set_Background (Fld, (Reverse_Video => True, others => False));
 226       end if;
 227       return Fld;
 228    end Make;
 229
 230    function Default_Driver (F : Form;
 231                             K : Key_Code;
 232                             P : Panel) return Boolean
 233    is
 234    begin
 235       if P = Null_Panel then
 236          raise Panel_Exception;
 237       end if;
 238       if K in User_Key_Code'Range and then K = QUIT then
 239          if Driver (F, F_Validate_Field) = Form_Ok  then
 240             return True;
 241          end if;
 242       end if;
 243       return False;
 244    end Default_Driver;
 245
 246    function Count_Active (F : Form) return Natural
 247    is
 248       N : Natural := 0;
 249       O : Field_Option_Set;
 250       H : constant Natural := Field_Count (F);
 251    begin
 252       if H > 0 then
 253          for I in 1 .. H loop
 254             Get_Options (Fields (F, I), O);
 255             if O.Active then
 256                N := N + 1;
 257             end if;
 258          end loop;
 259       end if;
 260       return N;
 261    end Count_Active;
 262
 263 end Sample.Form_Demo.Aux;