1/****************************************************************************
2 * Copyright 2020 Thomas E. Dickey                                          *
3 * Copyright 1998-2010,2013 Free Software Foundation, Inc.                  *
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29
30/****************************************************************************
31 *   Author:  Juergen Pfeifer, 1995,1997                                    *
32 ****************************************************************************/
33
34#include "form.priv.h"
35
36MODULE_ID("$Id: frm_data.c,v 1.19 2020/12/11 23:20:37 tom Exp $")
37
38/*---------------------------------------------------------------------------
39|   Facility      :  libnform
40|   Function      :  bool data_behind(const FORM *form)
41|
42|   Description   :  Check for off-screen data behind. This is nearly trivial
43|                    because the beginning of a field is fixed.
44|
45|   Return Values :  TRUE   - there are off-screen data behind
46|                    FALSE  - there are no off-screen data behind
47+--------------------------------------------------------------------------*/
48FORM_EXPORT(bool)
49data_behind(const FORM *form)
50{
51  bool result = FALSE;
52
53  T((T_CALLED("data_behind(%p)"), (const void *)form));
54
55  if (form && (form->status & _POSTED) && form->current)
56    {
57      FIELD *field;
58
59      field = form->current;
60      if (!Single_Line_Field(field))
61	{
62	  result = (form->toprow == 0) ? FALSE : TRUE;
63	}
64      else
65	{
66	  result = (form->begincol == 0) ? FALSE : TRUE;
67	}
68    }
69  returnBool(result);
70}
71
72/*---------------------------------------------------------------------------
73|   Facility      :  libnform
74|   Function      :  static char * Only_Padding(
75|                                    WINDOW *w,
76|                                    int len,
77|                                    int pad)
78|
79|   Description   :  Test if 'length' cells starting at the current position
80|                    contain a padding character.
81|
82|   Return Values :  true if only padding cells are found
83+--------------------------------------------------------------------------*/
84NCURSES_INLINE static bool
85Only_Padding(WINDOW *w, int len, int pad)
86{
87  bool result = TRUE;
88  int y, x, j;
89  FIELD_CELL cell;
90
91  getyx(w, y, x);
92  for (j = 0; j < len; ++j)
93    {
94      if (wmove(w, y, x + j) != ERR)
95	{
96#if USE_WIDEC_SUPPORT
97	  if (win_wch(w, &cell) != ERR)
98	    {
99	      if ((chtype)CharOf(cell) != ChCharOf(pad)
100		  || cell.chars[1] != 0)
101		{
102		  result = FALSE;
103		  break;
104		}
105	    }
106#else
107	  cell = (FIELD_CELL)winch(w);
108	  if (ChCharOf(cell) != ChCharOf(pad))
109	    {
110	      result = FALSE;
111	      break;
112	    }
113#endif
114	}
115      else
116	{
117	  /* if an error, return true: no non-padding text found */
118	  break;
119	}
120    }
121  /* no need to reset the cursor position; caller does this */
122  return result;
123}
124
125/*---------------------------------------------------------------------------
126|   Facility      :  libnform
127|   Function      :  bool data_ahead(const FORM *form)
128|
129|   Description   :  Check for off-screen data ahead. This is more difficult
130|                    because a dynamic field has a variable end.
131|
132|   Return Values :  TRUE   - there are off-screen data ahead
133|                    FALSE  - there are no off-screen data ahead
134+--------------------------------------------------------------------------*/
135FORM_EXPORT(bool)
136data_ahead(const FORM *form)
137{
138  bool result = FALSE;
139
140  T((T_CALLED("data_ahead(%p)"), (const void *)form));
141
142  if (form && (form->status & _POSTED) && form->current)
143    {
144      FIELD *field;
145      bool cursor_moved = FALSE;
146      int pos;
147
148      field = form->current;
149      assert(form->w);
150
151      if (Single_Line_Field(field))
152	{
153	  int check_len;
154
155	  pos = form->begincol + field->cols;
156	  while (pos < field->dcols)
157	    {
158	      check_len = field->dcols - pos;
159	      if (check_len >= field->cols)
160		check_len = field->cols;
161	      cursor_moved = TRUE;
162	      wmove(form->w, 0, pos);
163	      if (Only_Padding(form->w, check_len, field->pad))
164		pos += field->cols;
165	      else
166		{
167		  result = TRUE;
168		  break;
169		}
170	    }
171	}
172      else
173	{
174	  pos = form->toprow + field->rows;
175	  while (pos < field->drows)
176	    {
177	      cursor_moved = TRUE;
178	      wmove(form->w, pos, 0);
179	      pos++;
180	      if (!Only_Padding(form->w, field->cols, field->pad))
181		{
182		  result = TRUE;
183		  break;
184		}
185	    }
186	}
187
188      if (cursor_moved)
189	wmove(form->w, form->currow, form->curcol);
190    }
191  returnBool(result);
192}
193
194/* frm_data.c ends here */
195