2 * textbox.c - show a text box for messages, files or help
3 * Copyright (c) 1998,1999 Tim Janik
4 * Jaroslav Kysela <perex@perex.cz>
5 * Copyright (c) 2009 Clemens Ladisch <clemens@ladisch.de>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 2 of the License, or
10 * (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, see <http://www.gnu.org/licenses/>.
27 #include <alsa/asoundlib.h>
28 #include "gettext_curses.h"
36 #define MAX_FILE_SIZE 1048576
38 static void create_text_box(const char *const *lines, unsigned int count,
39 const char *title, int attrs);
41 void show_error(const char *msg, int err)
49 lines[1] = strerror(err);
52 create_text_box(lines, count, _("Error"), attr_errormsg);
55 void show_alsa_error(const char *msg, int err)
63 lines[1] = snd_strerror(err);
66 create_text_box(lines, count, _("Error"), attr_errormsg);
69 static char *read_file(const char *file_name, unsigned int *file_size)
74 unsigned int allocated = 2048;
75 unsigned int bytes_read;
77 f = fopen(file_name, "r");
80 buf = casprintf(_("Cannot open file \"%s\"."), file_name);
89 buf = crealloc(buf, allocated);
90 bytes_read = fread(buf + *file_size, 1, allocated - *file_size, f);
91 *file_size += bytes_read;
92 } while (*file_size == allocated && allocated < MAX_FILE_SIZE);
94 if (*file_size > 0 && buf[*file_size - 1] != '\n' && *file_size < allocated) {
95 buf[*file_size] = '\n';
101 void show_textfile(const char *file_name)
104 unsigned int file_size;
105 unsigned int line_count;
108 const char *start_line;
110 buf = read_file(file_name, &file_size);
114 for (i = 0; i < file_size; ++i)
115 line_count += buf[i] == '\n';
116 lines = ccalloc(line_count, sizeof *lines);
119 for (i = 0; i < file_size; ++i) {
120 if (buf[i] == '\n') {
121 lines[line_count++] = start_line;
123 start_line = &buf[i + 1];
128 create_text_box(lines, line_count, file_name, attr_textbox);
133 void show_text(const char *const *lines, unsigned int count, const char *title)
135 create_text_box(lines, count, title, attr_textbox);
138 /**********************************************************************/
140 static struct widget text_widget;
142 static int widget_attrs;
143 static char **text_lines;
144 static unsigned int text_lines_count;
145 static int max_line_width;
146 static int text_box_y;
147 static int text_box_x;
148 static int max_scroll_y;
149 static int max_scroll_x;
150 static int current_top;
151 static int current_left;
153 static void update_text_lines(void)
157 const char *line_begin;
158 const char *line_end;
162 for (i = 0; i < text_box_y; ++i) {
163 width = current_left;
164 line_begin = mbs_at_width(text_lines[current_top + i], &width, 1);
165 wmove(text_widget.window, i + 1, 1);
166 if (width > current_left)
167 waddch(text_widget.window, ' ');
168 if (*line_begin != '\0') {
169 width = text_box_x - (width > current_left);
170 line_end = mbs_at_width(line_begin, &width, -1);
172 waddnstr(text_widget.window, line_begin,
173 line_end - line_begin);
175 getyx(text_widget.window, cur_y, cur_x);
176 if (cur_y == i + 1) {
177 rest_of_line = text_box_x + 1 - cur_x;
178 if (rest_of_line > 0)
179 wprintw(text_widget.window, "%*s", rest_of_line, "");
184 static void update_y_scroll_bar(void)
190 if (max_scroll_y <= 0 || text_lines_count == 0)
192 length = text_box_y * text_box_y / text_lines_count;
193 if (length >= text_box_y)
195 begin = current_top * (text_box_y - length) / max_scroll_y;
196 end = begin + length;
197 for (i = 0; i < text_box_y; ++i)
198 mvwaddch(text_widget.window, i + 1, text_box_x + 1,
199 i >= begin && i < end ? ACS_BOARD : ' ');
202 static void update_x_scroll_bar(void)
208 if (max_scroll_x <= 0 || max_line_width <= 0)
210 length = text_box_x * text_box_x / max_line_width;
211 if (length >= text_box_x)
213 begin = current_left * (text_box_x - length) / max_scroll_x;
214 end = begin + length;
215 wmove(text_widget.window, text_box_y + 1, 1);
216 for (i = 0; i < text_box_x; ++i)
217 waddch(text_widget.window, i >= begin && i < end ? ACS_BOARD : ' ');
220 static void move_x(int delta)
224 left = current_left + delta;
227 else if (left > max_scroll_x)
229 if (left != current_left) {
232 update_x_scroll_bar();
236 static void move_y(int delta)
240 top = current_top + delta;
243 else if (top > max_scroll_y)
245 if (top != current_top) {
248 update_y_scroll_bar();
252 static void on_handle_key(int key)
306 move_x(-max_scroll_x);
310 move_x(max_scroll_x);
321 static bool create(void)
325 if (screen_lines < 3 || screen_cols < 8) {
331 width = max_line_width;
332 len = get_mbs_width(title) + 2;
336 text_box_y = text_lines_count;
337 if (text_box_y > screen_lines - 2)
338 text_box_y = screen_lines - 2;
339 max_scroll_y = text_lines_count - text_box_y;
341 if (text_box_x > screen_cols - 2)
342 text_box_x = screen_cols - 2;
343 max_scroll_x = max_line_width - text_box_x;
345 widget_init(&text_widget, text_box_y + 2, text_box_x + 2,
346 SCREEN_CENTER, SCREEN_CENTER, widget_attrs, WIDGET_BORDER);
347 mvwprintw(text_widget.window, 0, (text_box_x + 2 - get_mbs_width(title) - 2) / 2, " %s ", title);
349 if (current_top > max_scroll_y)
350 current_top = max_scroll_y;
351 if (current_left > max_scroll_x)
352 current_left = max_scroll_x;
354 update_y_scroll_bar();
355 update_x_scroll_bar();
359 static void on_window_size_changed(void)
364 static void on_close(void)
368 for (i = 0; i < text_lines_count; ++i)
371 widget_free(&text_widget);
374 static struct widget text_widget = {
375 .handle_key = on_handle_key,
376 .window_size_changed = on_window_size_changed,
380 static void create_text_box(const char *const *lines, unsigned int count,
381 const char *title_, int attrs)
385 text_lines = ccalloc(count, sizeof *text_lines);
386 for (i = 0; i < count; ++i)
387 text_lines[i] = cstrdup(lines[i]);
388 text_lines_count = count;
389 max_line_width = get_max_mbs_width(lines, count);
390 title = cstrdup(title_);
391 widget_attrs = attrs;