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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - scripts/kconfig/lxdialog/textbox.c
2 * textbox.c -- implements the text box
4 * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
5 * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 static void back_lines(int n
);
25 static void print_page(WINDOW
* win
, int height
, int width
);
26 static void print_line(WINDOW
* win
, int row
, int width
);
27 static char *get_line(void);
28 static void print_position(WINDOW
* win
);
31 static int begin_reached
, end_reached
, page_length
;
32 static const char *buf
;
33 static const char *page
;
36 * refresh window content
38 static void refresh_text_box(WINDOW
*dialog
, WINDOW
*box
, int boxh
, int boxw
,
41 print_page(box
, boxh
, boxw
);
42 print_position(dialog
);
43 wmove(dialog
, cur_y
, cur_x
); /* Restore cursor position */
49 * Display text from a file in a dialog box.
51 int dialog_textbox(const char *title
, const char *tbuf
,
52 int initial_height
, int initial_width
)
54 int i
, x
, y
, cur_x
, cur_y
, key
= 0;
55 int height
, width
, boxh
, boxw
;
64 page
= buf
; /* page is pointer to start of page to be displayed */
67 getmaxyx(stdscr
, height
, width
);
68 if (height
< 8 || width
< 8)
69 return -ERRDISPLAYTOOSMALL
;
70 if (initial_height
!= 0)
71 height
= initial_height
;
77 if (initial_width
!= 0)
78 width
= initial_width
;
85 /* center dialog box on screen */
86 x
= (COLS
- width
) / 2;
87 y
= (LINES
- height
) / 2;
89 draw_shadow(stdscr
, y
, x
, height
, width
);
91 dialog
= newwin(height
, width
, y
, x
);
94 /* Create window for box region, used for scrolling text */
97 box
= subwin(dialog
, boxh
, boxw
, y
+ 1, x
+ 1);
98 wattrset(box
, dlg
.dialog
.atr
);
99 wbkgdset(box
, dlg
.dialog
.atr
& A_COLOR
);
103 /* register the new window, along with its borders */
104 draw_box(dialog
, 0, 0, height
, width
,
105 dlg
.dialog
.atr
, dlg
.border
.atr
);
107 wattrset(dialog
, dlg
.border
.atr
);
108 mvwaddch(dialog
, height
- 3, 0, ACS_LTEE
);
109 for (i
= 0; i
< width
- 2; i
++)
110 waddch(dialog
, ACS_HLINE
);
111 wattrset(dialog
, dlg
.dialog
.atr
);
112 wbkgdset(dialog
, dlg
.dialog
.atr
& A_COLOR
);
113 waddch(dialog
, ACS_RTEE
);
115 print_title(dialog
, title
, width
);
117 print_button(dialog
, gettext(" Exit "), height
- 2, width
/ 2 - 4, TRUE
);
118 wnoutrefresh(dialog
);
119 getyx(dialog
, cur_y
, cur_x
); /* Save cursor position */
121 /* Print first page of text */
122 attr_clear(box
, boxh
, boxw
, dlg
.dialog
.atr
);
123 refresh_text_box(dialog
, box
, boxh
, boxw
, cur_y
, cur_x
);
125 while ((key
!= KEY_ESC
) && (key
!= '\n')) {
126 key
= wgetch(dialog
);
135 case 'g': /* First page */
137 if (!begin_reached
) {
140 refresh_text_box(dialog
, box
, boxh
, boxw
,
144 case 'G': /* Last page */
148 /* point to last char in buf */
149 page
= buf
+ strlen(buf
);
151 refresh_text_box(dialog
, box
, boxh
, boxw
,
154 case 'K': /* Previous line */
157 if (!begin_reached
) {
158 back_lines(page_length
+ 1);
160 /* We don't call print_page() here but use
161 * scrolling to ensure faster screen update.
162 * However, 'end_reached' and 'page_length'
163 * should still be updated, and 'page' should
164 * point to start of next page. This is done
165 * by calling get_line() in the following
168 wscrl(box
, -1); /* Scroll box region down one line */
169 scrollok(box
, FALSE
);
172 for (i
= 0; i
< boxh
; i
++) {
174 /* print first line of page */
175 print_line(box
, 0, boxw
);
178 /* Called to update 'end_reached' and 'page' */
182 if (end_reached
&& !passed_end
)
186 print_position(dialog
);
187 wmove(dialog
, cur_y
, cur_x
); /* Restore cursor position */
191 case 'B': /* Previous page */
196 back_lines(page_length
+ boxh
);
197 refresh_text_box(dialog
, box
, boxh
, boxw
,
200 case 'J': /* Next line */
206 scroll(box
); /* Scroll box region up one line */
207 scrollok(box
, FALSE
);
208 print_line(box
, boxh
- 1, boxw
);
210 print_position(dialog
);
211 wmove(dialog
, cur_y
, cur_x
); /* Restore cursor position */
215 case KEY_NPAGE
: /* Next page */
221 refresh_text_box(dialog
, box
, boxh
, boxw
,
224 case '0': /* Beginning of line */
225 case 'H': /* Scroll left */
235 /* Reprint current page to scroll horizontally */
236 back_lines(page_length
);
237 refresh_text_box(dialog
, box
, boxh
, boxw
,
240 case 'L': /* Scroll right */
243 if (hscroll
>= MAX_LEN
)
246 /* Reprint current page to scroll horizontally */
247 back_lines(page_length
);
248 refresh_text_box(dialog
, box
, boxh
, boxw
,
252 key
= on_key_esc(dialog
);
264 return key
; /* ESC pressed */
268 * Go back 'n' lines in text. Called by dialog_textbox().
269 * 'page' will be updated to point to the desired line in 'buf'.
271 static void back_lines(int n
)
276 /* Go back 'n' lines */
277 for (i
= 0; i
< n
; i
++) {
295 } while (*page
!= '\n');
301 * Print a new page of text. Called by dialog_textbox().
303 static void print_page(WINDOW
* win
, int height
, int width
)
305 int i
, passed_end
= 0;
308 for (i
= 0; i
< height
; i
++) {
309 print_line(win
, i
, width
);
312 if (end_reached
&& !passed_end
)
319 * Print a new line of text. Called by dialog_textbox() and print_page().
321 static void print_line(WINDOW
* win
, int row
, int width
)
327 line
+= MIN(strlen(line
), hscroll
); /* Scroll horizontally */
328 wmove(win
, row
, 0); /* move cursor to correct line */
330 waddnstr(win
, line
, MIN(strlen(line
), width
- 2));
333 /* Clear 'residue' of previous line */
337 for (i
= 0; i
< width
- x
; i
++)
346 * Return current line of text. Called by dialog_textbox() and print_line().
347 * 'page' should point to start of current line before calling, and will be
348 * updated to point to start of next line.
350 static char *get_line(void)
353 static char line
[MAX_LEN
+ 1];
356 while (*page
!= '\n') {
362 } else if (i
< MAX_LEN
)
363 line
[i
++] = *(page
++);
365 /* Truncate lines longer than MAX_LEN characters */
374 page
++; /* move pass '\n' */
380 * Print current position
382 static void print_position(WINDOW
* win
)
386 wattrset(win
, dlg
.position_indicator
.atr
);
387 wbkgdset(win
, dlg
.position_indicator
.atr
& A_COLOR
);
388 percent
= (page
- buf
) * 100 / strlen(buf
);
389 wmove(win
, getmaxy(win
) - 3, getmaxx(win
) - 9);
390 wprintw(win
, "(%3d%%)", percent
);