1 /**************************************************************************** 2 * Copyright 2020,2021 Thomas E. Dickey * 3 * Copyright 1998-2010,2013 Free Software Foundation, Inc. * 4 * * 5 * Permission is hereby granted, free of charge, to any person obtaining a * 6 * copy of this software and associated documentation files (the * 7 * "Software"), to deal in the Software without restriction, including * 8 * without limitation the rights to use, copy, modify, merge, publish, * 9 * distribute, distribute with modifications, sublicense, and/or sell * 10 * copies of the Software, and to permit persons to whom the Software is * 11 * furnished to do so, subject to the following conditions: * 12 * * 13 * The above copyright notice and this permission notice shall be included * 14 * in all copies or substantial portions of the Software. * 15 * * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 23 * * 24 * Except as contained in this notice, the name(s) of the above copyright * 25 * holders shall not be used in advertising or otherwise to promote the * 26 * sale, use or other dealings in this Software without prior written * 27 * authorization. * 28 ****************************************************************************/ 29 30 /**************************************************************************** 31 * Author: Juergen Pfeifer, 1995,1997 * 32 ****************************************************************************/ 33 34 #include "form.priv.h" 35 36 MODULE_ID("$Id: frm_data.c,v 1.21 2021/06/17 21:11:08 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 +--------------------------------------------------------------------------*/ 48 FORM_EXPORT(bool) 49 data_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 +--------------------------------------------------------------------------*/ 84 NCURSES_INLINE static bool 85 Only_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 +--------------------------------------------------------------------------*/ 135 FORM_EXPORT(bool) 136 data_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 pos = form->begincol + field->cols; 154 while (pos < field->dcols) 155 { 156 int check_len = field->dcols - pos; 157 158 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