1 /**************************************************************************** 2 * Copyright (c) 1998-2010,2013 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 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 1.16 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 +--------------------------------------------------------------------------*/ 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 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 = (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 +--------------------------------------------------------------------------*/ 134 NCURSES_EXPORT(bool) 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