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28
29/****************************************************************************
30 *   Author:  Juergen Pfeifer, 1995,1997                                    *
31 ****************************************************************************/
32
33#include "form.priv.h"
34
35MODULE_ID("$Id: frm_data.c,v 1.16 2013/08/24 22:44:05 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+--------------------------------------------------------------------------*/
47NCURSES_EXPORT(bool)
48data_behind(const FORM *form)
49{
50  bool result = FALSE;
51
52  T((T_CALLED("data_behind(%p)"), (const void *)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+--------------------------------------------------------------------------*/
83NCURSES_INLINE static bool
84Only_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 = (FIELD_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+--------------------------------------------------------------------------*/
134NCURSES_EXPORT(bool)
135data_ahead(const FORM *form)
136{
137  bool result = FALSE;
138
139  T((T_CALLED("data_ahead(%p)"), (const void *)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 */
194