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2 * Copyright (c) 1998-2005,2010 Free Software Foundation, Inc. *
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9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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27 ****************************************************************************/
28
29 /****************************************************************************
30 * Author: Juergen Pfeifer, 1995,1997 *
31 ****************************************************************************/
32
33 #include "form.priv.h"
34
35 MODULE_ID("$Id: frm_data.c,v 1.15 2010/01/23 21:14:36 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 +--------------------------------------------------------------------------*/
NCURSES_EXPORT(bool)47 NCURSES_EXPORT(bool)
48 data_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 +--------------------------------------------------------------------------*/
83 NCURSES_INLINE static bool
Only_Padding(WINDOW * w,int len,int pad)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)
data_ahead(const FORM * form)135 data_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