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Diffstat (limited to 'src/getstring.c')
| -rw-r--r-- | src/getstring.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/src/getstring.c b/src/getstring.c new file mode 100644 index 0000000..4df1d66 --- /dev/null +++ b/src/getstring.c @@ -0,0 +1,220 @@ +/* + * Calcurse - text-based organizer + * + * Copyright (c) 2004-2011 calcurse Development Team <misc@calcurse.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the + * following disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the + * following disclaimer in the documentation and/or other + * materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Send your feedback or comments to : misc@calcurse.org + * Calcurse home page : http://calcurse.org + * + */ + +#include "calcurse.h" + +/* Print the string at the desired position. */ +static void +showstring (WINDOW *win, int x, int y, char *str, int len, int scroff, + int curpos) +{ + char c = 0; + + /* print string */ + mvwaddnstr (win, y, x, &str[scroff], -1); + wclrtoeol (win); + + /* print scrolling indicator */ + if (scroff > 0 && scroff < len - col) + c = '*'; + else if (scroff > 0) + c = '<'; + else if (scroff < len - col) + c = '>'; + mvwprintw (win, y, col - 1, "%c", c); + + /* print cursor */ + wmove (win, y, curpos - scroff); + + if (curpos >= len) + waddch (win, SPACE | A_REVERSE); + else + waddch (win, str[curpos] | A_REVERSE); +} + +/* Delete a character at the given position in string. */ +static void +del_char (int pos, char *str) +{ + str += pos; + memmove (str, str + 1, strlen (str) + 1); +} + +/* Add a character at the given position in string. */ +static void +ins_char (int pos, int ch, char *str) +{ + str += pos; + memmove (str + 1, str, strlen (str) + 1); + *str = ch; +} + +static void +bell (void) +{ + printf ("\a"); +} + +/* + * Getstring allows to get user input and to print it on a window, + * even if noecho() is on. This function is also used to modify an existing + * text (the variable string can be non-NULL). + * We need to do the echoing manually because of the multi-threading + * environment, otherwise the cursor would move from place to place without + * control. + */ +enum getstr +getstring (WINDOW *win, char *str, int l, int x, int y) +{ + const int pgsize = col / 3; + + int len = strlen (str); + int curpos = len; + int scroff = 0; + int ch; + + custom_apply_attr (win, ATTR_HIGHEST); + + for (;;) { + while (curpos < scroff) + scroff -= pgsize; + while (curpos >= scroff + col - 1) + scroff += pgsize; + + showstring (win, x, y, str, len, scroff, curpos); + wins_doupdate (); + + if ((ch = wgetch (win)) == '\n') break; + switch (ch) + { + case KEY_BACKSPACE: /* delete one character */ + case 330: + case 127: + case CTRL ('H'): + if (curpos > 0) + { + del_char ((--curpos), str); + len--; + } + else + bell (); + break; + case CTRL ('D'): /* delete next character */ + if (curpos < len) + { + del_char (curpos, str); + len--; + } + else + bell (); + break; + case CTRL ('W'): /* delete a word */ + if (curpos > 0) { + while (curpos && str[curpos - 1] == ' ') + { + del_char ((--curpos), str); + len--; + } + while (curpos && str[curpos - 1] != ' ') + { + del_char ((--curpos), str); + len--; + } + } + else + bell (); + break; + case CTRL ('K'): /* delete to end-of-line */ + str[curpos] = 0; + len = curpos; + break; + case CTRL ('A'): /* go to begginning of string */ + curpos = 0; + break; + case CTRL ('E'): /* go to end of string */ + curpos = len; + break; + case KEY_LEFT: /* move one char backward */ + case CTRL ('B'): + if (curpos > 0) curpos--; + break; + case KEY_RIGHT: /* move one char forward */ + case CTRL ('F'): + if (curpos < len) curpos++; + break; + case ESCAPE: /* cancel editing */ + return (GETSTRING_ESC); + break; + default: /* insert one character */ + if (len < l - 1) + { + ins_char ((curpos++), ch, str); + len++; + } + } + } + + custom_remove_attr (win, ATTR_HIGHEST); + + return (len == 0 ? GETSTRING_RET : GETSTRING_VALID); +} + +/* Update an already existing string. */ +int +updatestring (WINDOW *win, char **str, int x, int y) +{ + int len = strlen (*str); + char *buf; + enum getstr ret; + + EXIT_IF (len + 1 > BUFSIZ, _("Internal error: line too long")); + + buf = mem_malloc (BUFSIZ); + (void)memcpy (buf, *str, len + 1); + + ret = getstring (win, buf, BUFSIZ, x, y); + + if (ret == GETSTRING_VALID) + { + len = strlen (buf); + *str = mem_realloc (*str, len + 1, 1); + EXIT_IF (*str == NULL, _("out of memory")); + (void)memcpy (*str, buf, len + 1); + } + + mem_free (buf); + return ret; +} |