VolksForth/8086/msdos/multi.vid

                                                                This display interface uses BIOS call $10 functions for a fast  display interface. A couple of state variables is contained     in a vector that is task specific such that different tasks     may use different windows. For simplicity windows always        span the whole width of the screen. They can be defined by      top and bottom line. This mechanism is used for a convenient    status display line on the bottom of the screen.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                \ Multitsking display interface loadscreen        ks phz 31jan22  Onlyforth    \needs Assembler   2 loadfrom asm.fb                                                                                   User area     area off    \ points at active window         Variable status   \ to switch status on/off                   | Variable cursor   \ points at area with active cursor                                                                           1 8 +thru   .( Multitasking display driver loaded ) cr                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        \ Multitsking display interface                   ks  6 sep 86                                                                    : Area:  Create  0 , 0 , 7 c, Does> area ! ;                  \ | col | row | top | bot | att |                                                                                               Area: terminal    terminal   area @ cursor !                                                                                      : (area   Create dup c, 1+ Does> c@ area @ + ;                                                                                0 | (area ccol    | (area crow    | (area ctop                    | (area cbot      (area catt    drop                                                                                            : window  ( topline botline -- )   cbot c!  ctop c! ;                                                                           : full     0 c/col 2- window ;  full                                                                                          \ Multitask (type (emit                           ks 20 dez 87                                                                    Code (type   ( addr len -- )   W pop   I push   R push             u' area U D) I mov   U push   D U mov                           $F # A+ mov   $10 int   u' catt I D) R- mov                     3 # A+ mov   $10 int   C push   D push   $E0E # C mov           1 # A+ mov   $10 int   I ) D mov   1 # C mov                    U inc   [[  U dec  0= not ?[[  2 # A+ mov   $10 int                 D- inc   ' c/row >body #) D- cmp   0= not                   ?[[  W ) A- mov   W inc   9 # A+ mov   $10 int   ]]? ]?         D I ) mov   D pop   cursor #) I cmp   0= ?[  I ) D mov  ]?      2 # A+ mov   $10 int   C pop   1 # A+ mov   $10 int   U pop     R pop   I pop   D pop   ' pause #) jmp   end-code                                                                            : (emit  ( char -- )   sp@ 1 (type drop ;                                                                                     \ Multitask (at (at?                              ks 04 aug 87    Code (at    ( row col -- )   A pop   A- D+ mov                     u' area U D) W mov   D W ) mov   cursor #) W cmp  0=            ?[  R push   U push   $F # A+ mov   $10 int                         2 # A+ mov   $10 int   U pop   R pop                        ]?  D pop   Next   end-code                                                                                                  Code (at?   ( -- row col )                                         D push   u' area U D) W mov   W ) D mov                         D+ A- mov   0 # A+ mov   A+ D+ mov   A push   Next           end-code                                                                                                                        Code curat? ( -- row col )   D push   R push                       $F # A+ mov   $10 int   3 # A+ mov   $10 int                    R pop   0 # A mov   D+ A- xchg   A push   Next               end-code                                                      \ cur!  curshape  setpage                         ks 28 jun 87                                                                    : cur!   \ set cursor into current task's window                   area @ cursor !  (at? (at ;  cur!                                                                                            Code curshape  ( top bot -- )   D C mov   D pop                    D- C+ mov   1 # A+ mov   $10 int   D pop   Next              end-code                                                                                                                        Code setpage   ( n -- )                                            $503 # A mov   D- A- and   $10 int   D pop   Next            end-code                                                                                                                                                                                                                                                                                                                      \ Multitask normal invers blankline               ks 01 nov 88    : normal     7 catt c! ;     : invers   $70 catt c! ;           : underline  1 catt c! ;     : bright    $F catt c! ;                                                                           Code blankline    D push   R push   U push   $F # A+ mov           $10 int   u' area U D) W mov   u' catt W D) R- mov              3 # A+ mov   $10 int   C push   D push                          $E0E # C mov   1 # A+ mov   $10 int   W ) D mov                 2 # A+ mov   $10 int   ' c/row >body #) C mov                   D- C- sub   bl # A- mov   9 # A+ mov                            C- C- or   0= not ?[  $10 int  ]?                               D pop   2 # A+ mov   $10 int  \ set cursor back                 C pop   1 # A+ mov   $10 int  \ cursor visible again            U pop   R pop   D pop   ' pause #) jmp   end-code                                                                          | : lineerase  ( line# -- )  0 (at blankline ;                  \ Multitask (del scroll (cr (page                 ks 04 okt 87                                                                    : (del    (at? ?dup                                                IF  1- 2dup (at  bl (emit  (at exit  THEN  drop ;                                                                            Code scroll   D push   R push   U push                             u' area U D) W mov   u' catt W D) R+ mov                        u' ctop W D) D mov   D- C+ mov   0 # C- mov                     ' c/row >body #) D- mov   D- dec   $601 # A mov                 $10 int   U pop   R pop   D pop   Next                       end-code                                                                                                                        : (cr     (at? drop 1+ dup cbot c@ u>                              IF  scroll drop cbot c@  THEN  lineerase ;                                                                                   : (page   ctop c@ cbot c@ DO  I lineerase  -1 +LOOP ;         \ Multitask status display                        ks 10 okt 87                                                                    ' (emit ' display   2 + !  ' (cr   ' display   4 + !            ' (type ' display   6 + !  ' (del  ' display   8 + !            ' (page ' display &10 + !                                       ' (at   ' display &12 + !  ' (at?  ' display &14 + !                                                                            : .base    base @ decimal  dup 2 .r  base ! ;                   : .sp      ( n -- )  ."  s" depth   swap 1+ - 2 .r ;            : (.drv    ( n -- )   Ascii A + emit ." : " ;                   : .dr      ."   " drv (.drv ;                                   : .scr     blk @ IF  ."   Blk" blk  ELSE  ."   Scr" scr  THEN              @ 5 .r ;                                             : .space   ."   Dic" s0 @ here $100 + - 6 u.r ;                                                                                                                                               \ statuszeile                                 ks  ks 04 aug 87                                                                  | : fstat  ( n -- )   .base .sp                                      .space .scr .dr file? 2 spaces order ;                                                                                     | Area: statusline                                                statusline c/col 1- dup window page invers  terminal                                                                            : (.status   output @ display   area @ statusline                  status @ IF  (at? drop 0 (at 2 fstat  blankline                          ELSE  normal page invers                                        THEN  area !  output ! ;                            ' (.status Is .status                                                                                                           : bye  status off .status bye ;