contrib/ncurses/form/frm_data.c

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  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 #include "form.priv.h"
  34
  35 MODULE_ID("$Id: frm_data.c,v 1.14 2005/11/26 15:34:01 tom Exp $")
  36
  37 /*---------------------------------------------------------------------------
  38 |   Facility      :  libnform
  39 |   Function      :  bool data_behind(const FORM *form)
  40 |
  41 |   Description   :  Check for off-screen data behind. This is nearly trivial
  42 |                    because the beginning of a field is fixed.
  43 |
  44 |   Return Values :  TRUE   - there are off-screen data behind
  45 |                    FALSE  - there are no off-screen data behind
  46 +--------------------------------------------------------------------------*/
  47 NCURSES_EXPORT(bool)
  48 data_behind(const FORM *form)
  49 {
  50   bool result = FALSE;
  51
  52   T((T_CALLED("data_behind(%p)"), form));
  53
  54   if (form && (form->status & _POSTED) && form->current)
  55     {
  56       FIELD *field;
  57
  58       field = form->current;
  59       if (!Single_Line_Field(field))
  60         {
  61           result = (form->toprow == 0) ? FALSE : TRUE;
  62         }
  63       else
  64         {
  65           result = (form->begincol == 0) ? FALSE : TRUE;
  66         }
  67     }
  68   returnBool(result);
  69 }
  70
  71 /*---------------------------------------------------------------------------
  72 |   Facility      :  libnform
  73 |   Function      :  static char * Only_Padding(
  74 |                                    WINDOW *w,
  75 |                                    int len,
  76 |                                    int pad)
  77 |
  78 |   Description   :  Test if 'length' cells starting at the current position
  79 |                    contain a padding character.
  80 |
  81 |   Return Values :  true if only padding cells are found
  82 +--------------------------------------------------------------------------*/
  83 NCURSES_INLINE static bool
  84 Only_Padding(WINDOW *w, int len, int pad)
  85 {
  86   bool result = TRUE;
  87   int y, x, j;
  88   FIELD_CELL cell;
  89
  90   getyx(w, y, x);
  91   for (j = 0; j < len; ++j)
  92     {
  93       if (wmove(w, y, x + j) != ERR)
  94         {
  95 #if USE_WIDEC_SUPPORT
  96           if (win_wch(w, &cell) != ERR)
  97             {
  98               if ((chtype)CharOf(cell) != ChCharOf(pad)
  99                   || cell.chars[1] != 0)
 100                 {
 101                   result = FALSE;
 102                   break;
 103                 }
 104             }
 105 #else
 106           cell = winch(w);
 107           if (ChCharOf(cell) != ChCharOf(pad))
 108             {
 109               result = FALSE;
 110               break;
 111             }
 112 #endif
 113         }
 114       else
 115         {
 116           /* if an error, return true: no non-padding text found */
 117           break;
 118         }
 119     }
 120   /* no need to reset the cursor position; caller does this */
 121   return result;
 122 }
 123
 124 /*---------------------------------------------------------------------------
 125 |   Facility      :  libnform
 126 |   Function      :  bool data_ahead(const FORM *form)
 127 |
 128 |   Description   :  Check for off-screen data ahead. This is more difficult
 129 |                    because a dynamic field has a variable end.
 130 |
 131 |   Return Values :  TRUE   - there are off-screen data ahead
 132 |                    FALSE  - there are no off-screen data ahead
 133 +--------------------------------------------------------------------------*/
 134 NCURSES_EXPORT(bool)
 135 data_ahead(const FORM *form)
 136 {
 137   bool result = FALSE;
 138
 139   T((T_CALLED("data_ahead(%p)"), form));
 140
 141   if (form && (form->status & _POSTED) && form->current)
 142     {
 143       FIELD *field;
 144       bool cursor_moved = FALSE;
 145       int pos;
 146
 147       field = form->current;
 148       assert(form->w);
 149
 150       if (Single_Line_Field(field))
 151         {
 152           int check_len;
 153
 154           pos = form->begincol + field->cols;
 155           while (pos < field->dcols)
 156             {
 157               check_len = field->dcols - pos;
 158               if (check_len >= field->cols)
 159                 check_len = field->cols;
 160               cursor_moved = TRUE;
 161               wmove(form->w, 0, pos);
 162               if (Only_Padding(form->w, check_len, field->pad))
 163                 pos += field->cols;
 164               else
 165                 {
 166                   result = TRUE;
 167                   break;
 168                 }
 169             }
 170         }
 171       else
 172         {
 173           pos = form->toprow + field->rows;
 174           while (pos < field->drows)
 175             {
 176               cursor_moved = TRUE;
 177               wmove(form->w, pos, 0);
 178               pos++;
 179               if (!Only_Padding(form->w, field->cols, field->pad))
 180                 {
 181                   result = TRUE;
 182                   break;
 183                 }
 184             }
 185         }
 186
 187       if (cursor_moved)
 188         wmove(form->w, form->currow, form->curcol);
 189     }
 190   returnBool(result);
 191 }
 192
 193 /* frm_data.c ends here */