release/src/router/libncurses/Ada95/samples/ncurses2-demo_forms.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                       GNAT ncurses Binding Samples                       --
   4 --                                                                          --
   5 --                                 ncurses                                  --
   6 --                                                                          --
   7 --                                 B O D Y                                  --
   8 --                                                                          --
   9 ------------------------------------------------------------------------------
  10 -- Copyright (c) 2000-2006,2011 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: Eugene V. Melaragno <aldomel@ix.netcom.com> 2000
  37 --  Version Control
  38 --  $Revision: 1.6 $
  39 --  $Date: 2011/03/23 00:44:12 $
  40 --  Binding Version 01.00
  41 ------------------------------------------------------------------------------
  42 with ncurses2.util; use ncurses2.util;
  43 with Terminal_Interface.Curses; use Terminal_Interface.Curses;
  44 with Terminal_Interface.Curses.Forms; use Terminal_Interface.Curses.Forms;
  45 with Terminal_Interface.Curses.Forms.Field_User_Data;
  46 with Ada.Characters.Handling;
  47 with Ada.Strings;
  48 with Ada.Strings.Bounded;
  49
  50 procedure ncurses2.demo_forms is
  51    package BS is new Ada.Strings.Bounded.Generic_Bounded_Length (80);
  52
  53    type myptr is access Integer;
  54
  55    --  The C version stores a pointer in the userptr and
  56    --  converts it into a long integer.
  57    --  The correct, but inconvenient  way to do it is to use a
  58    --  pointer to long and keep the pointer constant.
  59    --  It just adds one memory piece to allocate and deallocate (not done here)
  60
  61    package StringData is new
  62      Terminal_Interface.Curses.Forms.Field_User_Data (Integer, myptr);
  63
  64    function edit_secure (me : Field; c_in : Key_Code) return Key_Code;
  65    function form_virtualize (f : Form; w : Window) return Key_Code;
  66    function my_form_driver (f : Form; c : Key_Code) return Boolean;
  67    function make_label (frow  : Line_Position;
  68                         fcol  : Column_Position;
  69                         label : String) return Field;
  70    function make_field (frow   : Line_Position;
  71                         fcol   : Column_Position;
  72                         rows   : Line_Count;
  73                         cols   : Column_Count;
  74                         secure : Boolean) return Field;
  75    procedure display_form (f : Form);
  76    procedure erase_form (f : Form);
  77
  78    --  prints '*' instead of characters.
  79    --  Not that this keeps a bug from the C version:
  80    --  type in the psasword field then move off and back.
  81    --  the cursor is at position one, but
  82    --  this assumes it as at the end so text gets appended instead
  83    --  of overwtitting.
  84    function edit_secure (me : Field; c_in : Key_Code) return Key_Code is
  85       rows, frow : Line_Position;
  86       nrow : Natural;
  87       cols, fcol : Column_Position;
  88       nbuf : Buffer_Number;
  89       c : Key_Code := c_in;
  90       c2 :  Character;
  91
  92       use StringData;
  93    begin
  94       Info (me, rows, cols, frow, fcol, nrow, nbuf);
  95       --  TODO         if result = Form_Ok and nbuf > 0 then
  96       --  C version checked the return value
  97       --  of Info, the Ada binding throws an exception I think.
  98       if nbuf > 0 then
  99          declare
 100             temp : BS.Bounded_String;
 101             temps : String (1 .. 10);
 102             --  TODO Get_Buffer povides no information on the field length?
 103             len : myptr;
 104          begin
 105             Get_Buffer (me, 1, Str => temps);
 106             --  strcpy(temp, field_buffer(me, 1));
 107             Get_User_Data (me, len);
 108             temp := BS.To_Bounded_String (temps (1 .. len.all));
 109             if c <= Key_Max then
 110                c2 := Code_To_Char (c);
 111                if Ada.Characters.Handling.Is_Graphic (c2) then
 112                   BS.Append (temp, c2);
 113                   len.all := len.all + 1;
 114                   Set_Buffer (me, 1, BS.To_String (temp));
 115                   c := Character'Pos ('*');
 116                else
 117                   c := 0;
 118                end if;
 119             else
 120                case c is
 121                   when  REQ_BEG_FIELD |
 122                     REQ_CLR_EOF |
 123                     REQ_CLR_EOL |
 124                     REQ_DEL_LINE |
 125                     REQ_DEL_WORD |
 126                     REQ_DOWN_CHAR |
 127                     REQ_END_FIELD |
 128                     REQ_INS_CHAR |
 129                     REQ_INS_LINE |
 130                     REQ_LEFT_CHAR |
 131                     REQ_NEW_LINE |
 132                     REQ_NEXT_WORD |
 133                     REQ_PREV_WORD |
 134                     REQ_RIGHT_CHAR |
 135                     REQ_UP_CHAR =>
 136                      c := 0;         -- we don't want to do inline editing
 137                   when REQ_CLR_FIELD =>
 138                      if len.all /= 0 then
 139                         temp := BS.To_Bounded_String ("");
 140                         Set_Buffer (me, 1, BS.To_String (temp));
 141                         len.all := 0;
 142                      end if;
 143
 144                   when REQ_DEL_CHAR |
 145                     REQ_DEL_PREV =>
 146                      if len.all /= 0 then
 147                         BS.Delete (temp, BS.Length (temp), BS.Length (temp));
 148                         Set_Buffer (me, 1, BS.To_String (temp));
 149                         len.all := len.all - 1;
 150                      end if;
 151                   when others => null;
 152                end case;
 153             end if;
 154          end;
 155       end if;
 156       return c;
 157    end edit_secure;
 158
 159    mode : Key_Code := REQ_INS_MODE;
 160
 161    function form_virtualize (f : Form; w : Window) return Key_Code is
 162       type lookup_t is record
 163          code : Key_Code;
 164          result : Key_Code;
 165          --  should be Form_Request_Code, but we need MAX_COMMAND + 1
 166       end record;
 167
 168       lookup : constant array (Positive range <>) of lookup_t :=
 169         (
 170          (
 171           Character'Pos ('A') mod 16#20#, REQ_NEXT_CHOICE
 172           ),
 173          (
 174           Character'Pos ('B') mod 16#20#, REQ_PREV_WORD
 175           ),
 176          (
 177           Character'Pos ('C') mod 16#20#, REQ_CLR_EOL
 178           ),
 179          (
 180           Character'Pos ('D') mod 16#20#, REQ_DOWN_FIELD
 181           ),
 182          (
 183           Character'Pos ('E') mod 16#20#, REQ_END_FIELD
 184           ),
 185          (
 186           Character'Pos ('F') mod 16#20#, REQ_NEXT_PAGE
 187           ),
 188          (
 189           Character'Pos ('G') mod 16#20#, REQ_DEL_WORD
 190           ),
 191          (
 192           Character'Pos ('H') mod 16#20#, REQ_DEL_PREV
 193           ),
 194          (
 195           Character'Pos ('I') mod 16#20#, REQ_INS_CHAR
 196           ),
 197          (
 198           Character'Pos ('K') mod 16#20#, REQ_CLR_EOF
 199           ),
 200          (
 201           Character'Pos ('L') mod 16#20#, REQ_LEFT_FIELD
 202           ),
 203          (
 204           Character'Pos ('M') mod 16#20#, REQ_NEW_LINE
 205           ),
 206          (
 207           Character'Pos ('N') mod 16#20#, REQ_NEXT_FIELD
 208           ),
 209          (
 210           Character'Pos ('O') mod 16#20#, REQ_INS_LINE
 211           ),
 212          (
 213           Character'Pos ('P') mod 16#20#, REQ_PREV_FIELD
 214           ),
 215          (
 216           Character'Pos ('R') mod 16#20#, REQ_RIGHT_FIELD
 217           ),
 218          (
 219           Character'Pos ('S') mod 16#20#, REQ_BEG_FIELD
 220           ),
 221          (
 222           Character'Pos ('U') mod 16#20#, REQ_UP_FIELD
 223           ),
 224          (
 225           Character'Pos ('V') mod 16#20#, REQ_DEL_CHAR
 226           ),
 227          (
 228           Character'Pos ('W') mod 16#20#, REQ_NEXT_WORD
 229           ),
 230          (
 231           Character'Pos ('X') mod 16#20#, REQ_CLR_FIELD
 232           ),
 233          (
 234           Character'Pos ('Y') mod 16#20#, REQ_DEL_LINE
 235           ),
 236          (
 237           Character'Pos ('Z') mod 16#20#, REQ_PREV_CHOICE
 238           ),
 239          (
 240           Character'Pos ('[') mod 16#20#, --  ESCAPE
 241           Form_Request_Code'Last + 1
 242           ),
 243          (
 244           Key_Backspace, REQ_DEL_PREV
 245           ),
 246          (
 247           KEY_DOWN, REQ_DOWN_CHAR
 248           ),
 249          (
 250           Key_End, REQ_LAST_FIELD
 251           ),
 252          (
 253           Key_Home, REQ_FIRST_FIELD
 254           ),
 255          (
 256           KEY_LEFT, REQ_LEFT_CHAR
 257           ),
 258          (
 259           KEY_LL, REQ_LAST_FIELD
 260           ),
 261          (
 262           Key_Next, REQ_NEXT_FIELD
 263           ),
 264          (
 265           KEY_NPAGE, REQ_NEXT_PAGE
 266           ),
 267          (
 268           KEY_PPAGE, REQ_PREV_PAGE
 269           ),
 270          (
 271           Key_Previous, REQ_PREV_FIELD
 272           ),
 273          (
 274           KEY_RIGHT, REQ_RIGHT_CHAR
 275           ),
 276          (
 277           KEY_UP, REQ_UP_CHAR
 278           ),
 279          (
 280           Character'Pos ('Q') mod 16#20#, --  QUIT
 281           Form_Request_Code'Last + 1      --  TODO MAX_FORM_COMMAND + 1
 282           )
 283          );
 284
 285       c : Key_Code := Getchar (w);
 286       me : constant Field := Current (f);
 287
 288    begin
 289       if c = Character'Pos (']') mod 16#20# then
 290          if mode = REQ_INS_MODE then
 291             mode := REQ_OVL_MODE;
 292          else
 293             mode := REQ_INS_MODE;
 294          end if;
 295          c := mode;
 296       else
 297          for n in lookup'Range loop
 298             if lookup (n).code = c then
 299                c := lookup (n).result;
 300                exit;
 301             end if;
 302          end loop;
 303       end if;
 304
 305       --  Force the field that the user is typing into to be in reverse video,
 306       --  while the other fields are shown underlined.
 307       if c <= Key_Max then
 308          c := edit_secure (me, c);
 309          Set_Background (me, (Reverse_Video => True, others => False));
 310       elsif c <= Form_Request_Code'Last then
 311          c := edit_secure (me, c);
 312          Set_Background (me, (Under_Line => True, others => False));
 313       end if;
 314       return c;
 315    end form_virtualize;
 316
 317    function my_form_driver (f : Form; c : Key_Code) return Boolean is
 318       flag : constant Driver_Result := Driver (f, F_Validate_Field);
 319    begin
 320       if c = Form_Request_Code'Last + 1
 321         and flag = Form_Ok then
 322          return True;
 323       else
 324          Beep;
 325          return False;
 326       end if;
 327    end my_form_driver;
 328
 329    function make_label (frow  : Line_Position;
 330                         fcol  : Column_Position;
 331                         label : String) return Field is
 332       f : constant Field := Create (1, label'Length, frow, fcol, 0, 0);
 333       o : Field_Option_Set := Get_Options (f);
 334    begin
 335       if f /= Null_Field then
 336          Set_Buffer (f, 0, label);
 337          o.Active := False;
 338          Set_Options (f, o);
 339       end if;
 340       return f;
 341    end make_label;
 342
 343    function make_field (frow   : Line_Position;
 344                         fcol   : Column_Position;
 345                         rows   : Line_Count;
 346                         cols   : Column_Count;
 347                         secure : Boolean) return Field is
 348       f : Field;
 349       use StringData;
 350       len : myptr;
 351    begin
 352       if secure then
 353          f := Create (rows, cols, frow, fcol, 0, 1);
 354       else
 355          f := Create (rows, cols, frow, fcol, 0, 0);
 356       end if;
 357
 358       if f /= Null_Field then
 359          Set_Background (f, (Under_Line => True, others => False));
 360          len := new Integer;
 361          len.all := 0;
 362          Set_User_Data (f, len);
 363       end if;
 364       return f;
 365    end make_field;
 366
 367    procedure display_form (f : Form) is
 368       w : Window;
 369       rows : Line_Count;
 370       cols : Column_Count;
 371    begin
 372       Scale (f, rows, cols);
 373
 374       w := New_Window (rows + 2, cols + 4, 0, 0);
 375       if w /= Null_Window then
 376          Set_Window (f, w);
 377          Set_Sub_Window (f, Derived_Window (w, rows, cols, 1, 2));
 378          Box (w); -- 0,0
 379          Set_KeyPad_Mode (w, True);
 380       end if;
 381
 382       --  TODO if Post(f) /= Form_Ok then it's a procedure
 383       declare
 384       begin
 385          Post (f);
 386       exception
 387          when
 388            Eti_System_Error    |
 389            Eti_Bad_Argument    |
 390            Eti_Posted          |
 391            Eti_Connected       |
 392            Eti_Bad_State       |
 393            Eti_No_Room         |
 394            Eti_Not_Posted      |
 395            Eti_Unknown_Command |
 396            Eti_No_Match        |
 397            Eti_Not_Selectable  |
 398            Eti_Not_Connected   |
 399            Eti_Request_Denied  |
 400            Eti_Invalid_Field   |
 401            Eti_Current         =>
 402             Refresh (w);
 403       end;
 404       --  end if;
 405    end display_form;
 406
 407    procedure erase_form (f : Form) is
 408       w : Window := Get_Window (f);
 409       s : Window := Get_Sub_Window (f);
 410    begin
 411       Post (f, False);
 412       Erase (w);
 413       Refresh (w);
 414       Delete (s);
 415       Delete (w);
 416    end erase_form;
 417
 418    finished : Boolean := False;
 419    f : constant Field_Array_Access := new Field_Array (1 .. 12);
 420    secure : Field;
 421    myform : Form;
 422    w : Window;
 423    c : Key_Code;
 424    result : Driver_Result;
 425 begin
 426    Move_Cursor (Line => 18, Column => 0);
 427    Add (Str => "Defined form-traversal keys:   ^Q/ESC- exit form");
 428    Add (Ch => newl);
 429    Add (Str => "^N   -- go to next field       ^P  -- go to previous field");
 430    Add (Ch => newl);
 431    Add (Str => "Home -- go to first field      End -- go to last field");
 432    Add (Ch => newl);
 433    Add (Str => "^L   -- go to field to left    ^R  -- go to field to right");
 434    Add (Ch => newl);
 435    Add (Str => "^U   -- move upward to field   ^D  -- move downward to field");
 436    Add (Ch => newl);
 437    Add (Str => "^W   -- go to next word        ^B  -- go to previous word");
 438    Add (Ch => newl);
 439    Add (Str => "^S   -- go to start of field   ^E  -- go to end of field");
 440    Add (Ch => newl);
 441    Add (Str => "^H   -- delete previous char   ^Y  -- delete line");
 442    Add (Ch => newl);
 443    Add (Str => "^G   -- delete current word    ^C  -- clear to end of line");
 444    Add (Ch => newl);
 445    Add (Str => "^K   -- clear to end of field  ^X  -- clear field");
 446    Add (Ch => newl);
 447    Add (Str => "Arrow keys move within a field as you would expect.");
 448
 449    Add (Line => 4, Column => 57, Str => "Forms Entry Test");
 450
 451    Refresh;
 452
 453    --  describe the form
 454    f.all (1) := make_label (0, 15, "Sample Form");
 455    f.all (2) := make_label (2, 0, "Last Name");
 456    f.all (3) := make_field (3, 0, 1, 18, False);
 457    f.all (4) := make_label (2, 20, "First Name");
 458    f.all (5) := make_field (3, 20, 1, 12, False);
 459    f.all (6) := make_label (2, 34, "Middle Name");
 460    f.all (7) := make_field (3, 34, 1, 12, False);
 461    f.all (8) := make_label (5, 0, "Comments");
 462    f.all (9) := make_field (6, 0, 4, 46, False);
 463    f.all (10) := make_label (5, 20, "Password:");
 464    f.all (11) := make_field (5, 30, 1, 9, True);
 465    secure := f.all (11);
 466    f.all (12) := Null_Field;
 467
 468    myform := New_Form (f);
 469
 470    display_form (myform);
 471
 472    w := Get_Window (myform);
 473    Set_Raw_Mode (SwitchOn => True);
 474    Set_NL_Mode (SwitchOn => True);     --  lets us read ^M's
 475    while not finished loop
 476       c := form_virtualize (myform, w);
 477       result := Driver (myform, c);
 478       case result is
 479          when Form_Ok =>
 480             Add (Line => 5, Column => 57, Str => Get_Buffer (secure, 1));
 481             Clear_To_End_Of_Line;
 482             Refresh;
 483          when Unknown_Request =>
 484             finished := my_form_driver (myform, c);
 485          when others =>
 486             Beep;
 487       end case;
 488    end loop;
 489
 490    erase_form (myform);
 491
 492    --  TODO Free_Form(myform);
 493    --     for (c = 0; f[c] != 0; c++) free_field(f[c]);
 494    Set_Raw_Mode (SwitchOn => False);
 495    Set_NL_Mode (SwitchOn => True);
 496
 497 end ncurses2.demo_forms;