src/hci/mucurses/widgets/editbox.c

   1 /*
   2  * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA.
  18  *
  19  * You can also choose to distribute this program under the terms of
  20  * the Unmodified Binary Distribution Licence (as given in the file
  21  * COPYING.UBDL), provided that you have satisfied its requirements.
  22  */
  23
  24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  25
  26 #include <string.h>
  27 #include <assert.h>
  28 #include <ipxe/editbox.h>
  29
  30 /** @file
  31  *
  32  * Editable text box widget
  33  *
  34  */
  35
  36 #define EDITBOX_MIN_CHARS 3
  37
  38 /**
  39  * Initialise text box widget
  40  *
  41  * @v box               Editable text box widget
  42  * @v buf               Text buffer
  43  * @v len               Size of text buffer
  44  * @v win               Containing window
  45  * @v row               Row
  46  * @v col               Starting column
  47  * @v width             Width
  48  * @v flags             Flags
  49  */
  50 void init_editbox ( struct edit_box *box, char *buf, size_t len,
  51                     WINDOW *win, unsigned int row, unsigned int col,
  52                     unsigned int width, unsigned int flags ) {
  53         memset ( box, 0, sizeof ( *box ) );
  54         init_editstring ( &box->string, buf, len );
  55         box->string.cursor = strlen ( buf );
  56         box->win = ( win ? win : stdscr );
  57         box->row = row;
  58         box->col = col;
  59         box->width = width;
  60         box->flags = flags;
  61 }
  62
  63 /**
  64  * Draw text box widget
  65  *
  66  * @v box               Editable text box widget
  67  *
  68  */
  69 void draw_editbox ( struct edit_box *box ) {
  70         size_t width = box->width;
  71         char buf[ width + 1 ];
  72         signed int cursor_offset, underflow, overflow, first;
  73         size_t len;
  74
  75         /* Adjust starting offset so that cursor remains within box */
  76         cursor_offset = ( box->string.cursor - box->first );
  77         underflow = ( EDITBOX_MIN_CHARS - cursor_offset );
  78         overflow = ( cursor_offset - ( width - 1 ) );
  79         first = box->first;
  80         if ( underflow > 0 ) {
  81                 first -= underflow;
  82                 if ( first < 0 )
  83                         first = 0;
  84         } else if ( overflow > 0 ) {
  85                 first += overflow;
  86         }
  87         box->first = first;
  88         cursor_offset = ( box->string.cursor - first );
  89
  90         /* Construct underscore-padded string portion */
  91         memset ( buf, '_', width );
  92         buf[width] = '\0';
  93         len = ( strlen ( box->string.buf ) - first );
  94         if ( len > width )
  95                 len = width;
  96         if ( box->flags & EDITBOX_STARS ) {
  97                 memset ( buf, '*', len );
  98         } else {
  99                 memcpy ( buf, ( box->string.buf + first ), len );
 100         }
 101
 102         /* Print box content and move cursor */
 103         if ( ! box->win )
 104                 box->win = stdscr;
 105         mvwprintw ( box->win, box->row, box->col, "%s", buf );
 106         wmove ( box->win, box->row, ( box->col + cursor_offset ) );
 107 }