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[/] [test_project/] [trunk/] [linux_sd_driver/] [scripts/] [kconfig/] [lxdialog/] [textbox.c] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl
/*
2
 *  textbox.c -- implements the text box
3
 *
4
 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
5
 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
6
 *
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.
11
 *
12
 *  This program is distributed in the hope that it will be useful,
13
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
16
 *
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 *  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.
20
 */
21
 
22
#include "dialog.h"
23
 
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);
29
 
30
static int hscroll;
31
static int begin_reached, end_reached, page_length;
32
static const char *buf;
33
static const char *page;
34
 
35
/*
36
 * refresh window content
37
 */
38
static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
39
                                                          int cur_y, int cur_x)
40
{
41
        print_page(box, boxh, boxw);
42
        print_position(dialog);
43
        wmove(dialog, cur_y, cur_x);    /* Restore cursor position */
44
        wrefresh(dialog);
45
}
46
 
47
 
48
/*
49
 * Display text from a file in a dialog box.
50
 */
51
int dialog_textbox(const char *title, const char *tbuf,
52
                   int initial_height, int initial_width)
53
{
54
        int i, x, y, cur_x, cur_y, key = 0;
55
        int height, width, boxh, boxw;
56
        int passed_end;
57
        WINDOW *dialog, *box;
58
 
59
        begin_reached = 1;
60
        end_reached = 0;
61
        page_length = 0;
62
        hscroll = 0;
63
        buf = tbuf;
64
        page = buf;     /* page is pointer to start of page to be displayed */
65
 
66
do_resize:
67
        getmaxyx(stdscr, height, width);
68
        if (height < 8 || width < 8)
69
                return -ERRDISPLAYTOOSMALL;
70
        if (initial_height != 0)
71
                height = initial_height;
72
        else
73
                if (height > 4)
74
                        height -= 4;
75
                else
76
                        height = 0;
77
        if (initial_width != 0)
78
                width = initial_width;
79
        else
80
                if (width > 5)
81
                        width -= 5;
82
                else
83
                        width = 0;
84
 
85
        /* center dialog box on screen */
86
        x = (COLS - width) / 2;
87
        y = (LINES - height) / 2;
88
 
89
        draw_shadow(stdscr, y, x, height, width);
90
 
91
        dialog = newwin(height, width, y, x);
92
        keypad(dialog, TRUE);
93
 
94
        /* Create window for box region, used for scrolling text */
95
        boxh = height - 4;
96
        boxw = width - 2;
97
        box = subwin(dialog, boxh, boxw, y + 1, x + 1);
98
        wattrset(box, dlg.dialog.atr);
99
        wbkgdset(box, dlg.dialog.atr & A_COLOR);
100
 
101
        keypad(box, TRUE);
102
 
103
        /* register the new window, along with its borders */
104
        draw_box(dialog, 0, 0, height, width,
105
                 dlg.dialog.atr, dlg.border.atr);
106
 
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);
114
 
115
        print_title(dialog, title, width);
116
 
117
        print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
118
        wnoutrefresh(dialog);
119
        getyx(dialog, cur_y, cur_x);    /* Save cursor position */
120
 
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);
124
 
125
        while ((key != KEY_ESC) && (key != '\n')) {
126
                key = wgetch(dialog);
127
                switch (key) {
128
                case 'E':       /* Exit */
129
                case 'e':
130
                case 'X':
131
                case 'x':
132
                        delwin(box);
133
                        delwin(dialog);
134
                        return 0;
135
                case 'g':       /* First page */
136
                case KEY_HOME:
137
                        if (!begin_reached) {
138
                                begin_reached = 1;
139
                                page = buf;
140
                                refresh_text_box(dialog, box, boxh, boxw,
141
                                                 cur_y, cur_x);
142
                        }
143
                        break;
144
                case 'G':       /* Last page */
145
                case KEY_END:
146
 
147
                        end_reached = 1;
148
                        /* point to last char in buf */
149
                        page = buf + strlen(buf);
150
                        back_lines(boxh);
151
                        refresh_text_box(dialog, box, boxh, boxw,
152
                                         cur_y, cur_x);
153
                        break;
154
                case 'K':       /* Previous line */
155
                case 'k':
156
                case KEY_UP:
157
                        if (!begin_reached) {
158
                                back_lines(page_length + 1);
159
 
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
166
                                 * 'for' loop. */
167
                                scrollok(box, TRUE);
168
                                wscrl(box, -1); /* Scroll box region down one line */
169
                                scrollok(box, FALSE);
170
                                page_length = 0;
171
                                passed_end = 0;
172
                                for (i = 0; i < boxh; i++) {
173
                                        if (!i) {
174
                                                /* print first line of page */
175
                                                print_line(box, 0, boxw);
176
                                                wnoutrefresh(box);
177
                                        } else
178
                                                /* Called to update 'end_reached' and 'page' */
179
                                                get_line();
180
                                        if (!passed_end)
181
                                                page_length++;
182
                                        if (end_reached && !passed_end)
183
                                                passed_end = 1;
184
                                }
185
 
186
                                print_position(dialog);
187
                                wmove(dialog, cur_y, cur_x);    /* Restore cursor position */
188
                                wrefresh(dialog);
189
                        }
190
                        break;
191
                case 'B':       /* Previous page */
192
                case 'b':
193
                case KEY_PPAGE:
194
                        if (begin_reached)
195
                                break;
196
                        back_lines(page_length + boxh);
197
                        refresh_text_box(dialog, box, boxh, boxw,
198
                                         cur_y, cur_x);
199
                        break;
200
                case 'J':       /* Next line */
201
                case 'j':
202
                case KEY_DOWN:
203
                        if (!end_reached) {
204
                                begin_reached = 0;
205
                                scrollok(box, TRUE);
206
                                scroll(box);    /* Scroll box region up one line */
207
                                scrollok(box, FALSE);
208
                                print_line(box, boxh - 1, boxw);
209
                                wnoutrefresh(box);
210
                                print_position(dialog);
211
                                wmove(dialog, cur_y, cur_x);    /* Restore cursor position */
212
                                wrefresh(dialog);
213
                        }
214
                        break;
215
                case KEY_NPAGE: /* Next page */
216
                case ' ':
217
                        if (end_reached)
218
                                break;
219
 
220
                        begin_reached = 0;
221
                        refresh_text_box(dialog, box, boxh, boxw,
222
                                         cur_y, cur_x);
223
                        break;
224
                case '0':       /* Beginning of line */
225
                case 'H':       /* Scroll left */
226
                case 'h':
227
                case KEY_LEFT:
228
                        if (hscroll <= 0)
229
                                break;
230
 
231
                        if (key == '0')
232
                                hscroll = 0;
233
                        else
234
                                hscroll--;
235
                        /* Reprint current page to scroll horizontally */
236
                        back_lines(page_length);
237
                        refresh_text_box(dialog, box, boxh, boxw,
238
                                         cur_y, cur_x);
239
                        break;
240
                case 'L':       /* Scroll right */
241
                case 'l':
242
                case KEY_RIGHT:
243
                        if (hscroll >= MAX_LEN)
244
                                break;
245
                        hscroll++;
246
                        /* Reprint current page to scroll horizontally */
247
                        back_lines(page_length);
248
                        refresh_text_box(dialog, box, boxh, boxw,
249
                                         cur_y, cur_x);
250
                        break;
251
                case KEY_ESC:
252
                        key = on_key_esc(dialog);
253
                        break;
254
                case KEY_RESIZE:
255
                        back_lines(height);
256
                        delwin(box);
257
                        delwin(dialog);
258
                        on_key_resize();
259
                        goto do_resize;
260
                }
261
        }
262
        delwin(box);
263
        delwin(dialog);
264
        return key;             /* ESC pressed */
265
}
266
 
267
/*
268
 * Go back 'n' lines in text. Called by dialog_textbox().
269
 * 'page' will be updated to point to the desired line in 'buf'.
270
 */
271
static void back_lines(int n)
272
{
273
        int i;
274
 
275
        begin_reached = 0;
276
        /* Go back 'n' lines */
277
        for (i = 0; i < n; i++) {
278
                if (*page == '\0') {
279
                        if (end_reached) {
280
                                end_reached = 0;
281
                                continue;
282
                        }
283
                }
284
                if (page == buf) {
285
                        begin_reached = 1;
286
                        return;
287
                }
288
                page--;
289
                do {
290
                        if (page == buf) {
291
                                begin_reached = 1;
292
                                return;
293
                        }
294
                        page--;
295
                } while (*page != '\n');
296
                page++;
297
        }
298
}
299
 
300
/*
301
 * Print a new page of text. Called by dialog_textbox().
302
 */
303
static void print_page(WINDOW * win, int height, int width)
304
{
305
        int i, passed_end = 0;
306
 
307
        page_length = 0;
308
        for (i = 0; i < height; i++) {
309
                print_line(win, i, width);
310
                if (!passed_end)
311
                        page_length++;
312
                if (end_reached && !passed_end)
313
                        passed_end = 1;
314
        }
315
        wnoutrefresh(win);
316
}
317
 
318
/*
319
 * Print a new line of text. Called by dialog_textbox() and print_page().
320
 */
321
static void print_line(WINDOW * win, int row, int width)
322
{
323
        int y, x;
324
        char *line;
325
 
326
        line = get_line();
327
        line += MIN(strlen(line), hscroll);     /* Scroll horizontally */
328
        wmove(win, row, 0);      /* move cursor to correct line */
329
        waddch(win, ' ');
330
        waddnstr(win, line, MIN(strlen(line), width - 2));
331
 
332
        getyx(win, y, x);
333
        /* Clear 'residue' of previous line */
334
#if OLD_NCURSES
335
        {
336
                int i;
337
                for (i = 0; i < width - x; i++)
338
                        waddch(win, ' ');
339
        }
340
#else
341
        wclrtoeol(win);
342
#endif
343
}
344
 
345
/*
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.
349
 */
350
static char *get_line(void)
351
{
352
        int i = 0;
353
        static char line[MAX_LEN + 1];
354
 
355
        end_reached = 0;
356
        while (*page != '\n') {
357
                if (*page == '\0') {
358
                        if (!end_reached) {
359
                                end_reached = 1;
360
                                break;
361
                        }
362
                } else if (i < MAX_LEN)
363
                        line[i++] = *(page++);
364
                else {
365
                        /* Truncate lines longer than MAX_LEN characters */
366
                        if (i == MAX_LEN)
367
                                line[i++] = '\0';
368
                        page++;
369
                }
370
        }
371
        if (i <= MAX_LEN)
372
                line[i] = '\0';
373
        if (!end_reached)
374
                page++;         /* move pass '\n' */
375
 
376
        return line;
377
}
378
 
379
/*
380
 * Print current position
381
 */
382
static void print_position(WINDOW * win)
383
{
384
        int percent;
385
 
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);
391
}

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