core/lib/ctk-textentry-multiline.c

   1 /*
   2  * Copyright (c) 2002-2003, Adam Dunkels.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above
  11  *    copyright notice, this list of conditions and the following
  12  *    disclaimer in the documentation and/or other materials provided
  13  *    with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote
  15  *    products derived from this software without specific prior
  16  *    written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  19  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  24  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  26  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * This file is part of the Contiki operating system.
  31  *
  32  * $Id: ctk-textentry-multiline.c,v 1.2 2006/08/21 21:59:59 oliverschmidt Exp $
  33  *
  34  */
  35
  36 #include <string.h>
  37
  38 #include "ctk/ctk.h"
  39
  40 #include "lib/ctk-textentry-multiline.h"
  41
  42 /*-----------------------------------------------------------------------------------*/
  43 unsigned char
  44 ctk_textentry_multiline_input(ctk_arch_key_t c,
  45                               struct ctk_textentry *t)
  46 {
  47   unsigned char len;
  48
  49   switch(c) {
  50   case 0:
  51     t->xpos = (unsigned char)strlen(&t->text[t->ypos * (t->len + 1)]);
  52     if(t->xpos == t->len) {
  53       --t->xpos;
  54     }
  55     return 1;
  56
  57   case CH_CURS_UP:
  58     if(t->ypos == 0) {
  59       t->xpos = 0;
  60       return 1;
  61     }
  62     --t->ypos;
  63     break;
  64
  65   case CH_CURS_DOWN:
  66     if(t->ypos == t->h - 1) {
  67       t->xpos = (unsigned char)strlen(&t->text[t->ypos * (t->len + 1)]);
  68       if(t->xpos == t->len) {
  69         --t->xpos;
  70       }
  71       return 1;
  72     }
  73     ++t->ypos;
  74     break;
  75
  76   case CH_ENTER:
  77     if(t->ypos == t->h - 1) {
  78       return 0;
  79     }
  80     ++t->ypos;
  81     t->xpos = 0;
  82     return 1;
  83
  84   default:
  85     return 0;
  86   }
  87
  88   len = (unsigned char)strlen(&t->text[t->ypos * (t->len + 1)]);
  89   if(t->xpos > len) {
  90     t->xpos = len;
  91   }
  92   return 1;
  93 }
  94 /*-----------------------------------------------------------------------------------*/