comparison: pdcurses/scroll.c
pdcurses/scroll.c
- changeset 97
- 2d43f05b284c
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| 96:5314ebdcb38d | 97:2d43f05b284c |
|---|---|
| 1 /* Public Domain Curses */ | |
| 2 | |
| 3 #include <curspriv.h> | |
| 4 | |
| 5 RCSID("$Id: scroll.c,v 1.36 2008/07/13 16:08:18 wmcbrine Exp $") | |
| 6 | |
| 7 /*man-start************************************************************** | |
| 8 | |
| 9 Name: scroll | |
| 10 | |
| 11 Synopsis: | |
| 12 int scroll(WINDOW *win); | |
| 13 int scrl(int n); | |
| 14 int wscrl(WINDOW *win, int n); | |
| 15 | |
| 16 Description: | |
| 17 scroll() causes the window to scroll up one line. This involves | |
| 18 moving the lines in the window data strcture. | |
| 19 | |
| 20 With a positive n, scrl() and wscrl() scroll the window up n | |
| 21 lines (line i + n becomes i); otherwise they scroll the window | |
| 22 down n lines. | |
| 23 | |
| 24 For these functions to work, scrolling must be enabled via | |
| 25 scrollok(). Note also that scrolling is not allowed if the | |
| 26 supplied window is a pad. | |
| 27 | |
| 28 Return Value: | |
| 29 All functions return OK on success and ERR on error. | |
| 30 | |
| 31 Portability X/Open BSD SYS V | |
| 32 scroll Y Y Y | |
| 33 scrl Y - 4.0 | |
| 34 wscrl Y - 4.0 | |
| 35 | |
| 36 **man-end****************************************************************/ | |
| 37 | |
| 38 int wscrl(WINDOW *win, int n) | |
| 39 { | |
| 40 int i, l, dir, start, end; | |
| 41 chtype blank, *temp; | |
| 42 | |
| 43 /* Check if window scrolls. Valid for window AND pad */ | |
| 44 | |
| 45 if (!win || !win->_scroll || !n) | |
| 46 return ERR; | |
| 47 | |
| 48 blank = win->_bkgd; | |
| 49 | |
| 50 if (n > 0) | |
| 51 { | |
| 52 start = win->_tmarg; | |
| 53 end = win->_bmarg; | |
| 54 dir = 1; | |
| 55 } | |
| 56 else | |
| 57 { | |
| 58 start = win->_bmarg; | |
| 59 end = win->_tmarg; | |
| 60 dir = -1; | |
| 61 } | |
| 62 | |
| 63 for (l = 0; l < (n * dir); l++) | |
| 64 { | |
| 65 temp = win->_y[start]; | |
| 66 | |
| 67 /* re-arrange line pointers */ | |
| 68 | |
| 69 for (i = start; i != end; i += dir) | |
| 70 win->_y[i] = win->_y[i + dir]; | |
| 71 | |
| 72 win->_y[end] = temp; | |
| 73 | |
| 74 /* make a blank line */ | |
| 75 | |
| 76 for (i = 0; i < win->_maxx; i++) | |
| 77 *temp++ = blank; | |
| 78 } | |
| 79 | |
| 80 touchline(win, win->_tmarg, win->_bmarg - win->_tmarg + 1); | |
| 81 | |
| 82 PDC_sync(win); | |
| 83 return OK; | |
| 84 } | |
| 85 | |
| 86 int scrl(int n) | |
| 87 { | |
| 88 PDC_LOG(("scrl() - called\n")); | |
| 89 | |
| 90 return wscrl(stdscr, n); | |
| 91 } | |
| 92 | |
| 93 int scroll(WINDOW *win) | |
| 94 { | |
| 95 PDC_LOG(("scroll() - called\n")); | |
| 96 | |
| 97 return wscrl(win, 1); | |
| 98 } |
