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Diffstat (limited to 'adk/config/lxdialog/textbox.c')
| -rw-r--r-- | adk/config/lxdialog/textbox.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/adk/config/lxdialog/textbox.c b/adk/config/lxdialog/textbox.c new file mode 100644 index 000000000..c704712d0 --- /dev/null +++ b/adk/config/lxdialog/textbox.c @@ -0,0 +1,391 @@ +/* + * textbox.c -- implements the text box + * + * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk) + * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include "dialog.h" + +static void back_lines(int n); +static void print_page(WINDOW * win, int height, int width); +static void print_line(WINDOW * win, int row, int width); +static char *get_line(void); +static void print_position(WINDOW * win); + +static int hscroll; +static int begin_reached, end_reached, page_length; +static const char *buf; +static const char *page; + +/* + * refresh window content + */ +static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw, + int cur_y, int cur_x) +{ + print_page(box, boxh, boxw); + print_position(dialog); + wmove(dialog, cur_y, cur_x); /* Restore cursor position */ + wrefresh(dialog); +} + + +/* + * Display text from a file in a dialog box. + */ +int dialog_textbox(const char *title, const char *tbuf, + int initial_height, int initial_width) +{ + int i, x, y, cur_x, cur_y, key = 0; + int height, width, boxh, boxw; + int passed_end; + WINDOW *dialog, *box; + + begin_reached = 1; + end_reached = 0; + page_length = 0; + hscroll = 0; + buf = tbuf; + page = buf; /* page is pointer to start of page to be displayed */ + +do_resize: + getmaxyx(stdscr, height, width); + if (height < 8 || width < 8) + return -ERRDISPLAYTOOSMALL; + if (initial_height != 0) + height = initial_height; + else + if (height > 4) + height -= 4; + else + height = 0; + if (initial_width != 0) + width = initial_width; + else + if (width > 5) + width -= 5; + else + width = 0; + + /* center dialog box on screen */ + x = (COLS - width) / 2; + y = (LINES - height) / 2; + + draw_shadow(stdscr, y, x, height, width); + + dialog = newwin(height, width, y, x); + keypad(dialog, TRUE); + + /* Create window for box region, used for scrolling text */ + boxh = height - 4; + boxw = width - 2; + box = subwin(dialog, boxh, boxw, y + 1, x + 1); + wattrset(box, dlg.dialog.atr); + wbkgdset(box, dlg.dialog.atr & A_COLOR); + + keypad(box, TRUE); + + /* register the new window, along with its borders */ + draw_box(dialog, 0, 0, height, width, + dlg.dialog.atr, dlg.border.atr); + + wattrset(dialog, dlg.border.atr); + mvwaddch(dialog, height - 3, 0, ACS_LTEE); + for (i = 0; i < width - 2; i++) + waddch(dialog, ACS_HLINE); + wattrset(dialog, dlg.dialog.atr); + wbkgdset(dialog, dlg.dialog.atr & A_COLOR); + waddch(dialog, ACS_RTEE); + + print_title(dialog, title, width); + + print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE); + wnoutrefresh(dialog); + getyx(dialog, cur_y, cur_x); /* Save cursor position */ + + /* Print first page of text */ + attr_clear(box, boxh, boxw, dlg.dialog.atr); + refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x); + + while ((key != KEY_ESC) && (key != '\n')) { + key = wgetch(dialog); + switch (key) { + case 'E': /* Exit */ + case 'e': + case 'X': + case 'x': + delwin(box); + delwin(dialog); + return 0; + case 'g': /* First page */ + case KEY_HOME: + if (!begin_reached) { + begin_reached = 1; + page = buf; + refresh_text_box(dialog, box, boxh, boxw, + cur_y, cur_x); + } + break; + case 'G': /* Last page */ + case KEY_END: + + end_reached = 1; + /* point to last char in buf */ + page = buf + strlen(buf); + back_lines(boxh); + refresh_text_box(dialog, box, boxh, boxw, + cur_y, cur_x); + break; + case 'K': /* Previous line */ + case 'k': + case KEY_UP: + if (!begin_reached) { + back_lines(page_length + 1); + + /* We don't call print_page() here but use + * scrolling to ensure faster screen update. + * However, 'end_reached' and 'page_length' + * should still be updated, and 'page' should + * point to start of next page. This is done + * by calling get_line() in the following + * 'for' loop. */ + scrollok(box, TRUE); + wscrl(box, -1); /* Scroll box region down one line */ + scrollok(box, FALSE); + page_length = 0; + passed_end = 0; + for (i = 0; i < boxh; i++) { + if (!i) { + /* print first line of page */ + print_line(box, 0, boxw); + wnoutrefresh(box); + } else + /* Called to update 'end_reached' and 'page' */ + get_line(); + if (!passed_end) + page_length++; + if (end_reached && !passed_end) + passed_end = 1; + } + + print_position(dialog); + wmove(dialog, cur_y, cur_x); /* Restore cursor position */ + wrefresh(dialog); + } + break; + case 'B': /* Previous page */ + case 'b': + case KEY_PPAGE: + if (begin_reached) + break; + back_lines(page_length + boxh); + refresh_text_box(dialog, box, boxh, boxw, + cur_y, cur_x); + break; + case 'J': /* Next line */ + case 'j': + case KEY_DOWN: + if (!end_reached) { + begin_reached = 0; + scrollok(box, TRUE); + scroll(box); /* Scroll box region up one line */ + scrollok(box, FALSE); + print_line(box, boxh - 1, boxw); + wnoutrefresh(box); + print_position(dialog); + wmove(dialog, cur_y, cur_x); /* Restore cursor position */ + wrefresh(dialog); + } + break; + case KEY_NPAGE: /* Next page */ + case ' ': + if (end_reached) + break; + + begin_reached = 0; + refresh_text_box(dialog, box, boxh, boxw, + cur_y, cur_x); + break; + case '0': /* Beginning of line */ + case 'H': /* Scroll left */ + case 'h': + case KEY_LEFT: + if (hscroll <= 0) + break; + + if (key == '0') + hscroll = 0; + else + hscroll--; + /* Reprint current page to scroll horizontally */ + back_lines(page_length); + refresh_text_box(dialog, box, boxh, boxw, + cur_y, cur_x); + break; + case 'L': /* Scroll right */ + case 'l': + case KEY_RIGHT: + if (hscroll >= MAX_LEN) + break; + hscroll++; + /* Reprint current page to scroll horizontally */ + back_lines(page_length); + refresh_text_box(dialog, box, boxh, boxw, + cur_y, cur_x); + break; + case KEY_ESC: + key = on_key_esc(dialog); + break; + case KEY_RESIZE: + back_lines(height); + delwin(box); + delwin(dialog); + on_key_resize(); + goto do_resize; + } + } + delwin(box); + delwin(dialog); + return key; /* ESC pressed */ +} + +/* + * Go back 'n' lines in text. Called by dialog_textbox(). + * 'page' will be updated to point to the desired line in 'buf'. + */ +static void back_lines(int n) +{ + int i; + + begin_reached = 0; + /* Go back 'n' lines */ + for (i = 0; i < n; i++) { + if (*page == '\0') { + if (end_reached) { + end_reached = 0; + continue; + } + } + if (page == buf) { + begin_reached = 1; + return; + } + page--; + do { + if (page == buf) { + begin_reached = 1; + return; + } + page--; + } while (*page != '\n'); + page++; + } +} + +/* + * Print a new page of text. Called by dialog_textbox(). + */ +static void print_page(WINDOW * win, int height, int width) +{ + int i, passed_end = 0; + + page_length = 0; + for (i = 0; i < height; i++) { + print_line(win, i, width); + if (!passed_end) + page_length++; + if (end_reached && !passed_end) + passed_end = 1; + } + wnoutrefresh(win); +} + +/* + * Print a new line of text. Called by dialog_textbox() and print_page(). + */ +static void print_line(WINDOW * win, int row, int width) +{ + int y, x; + char *line; + + line = get_line(); + line += MIN(strlen(line), hscroll); /* Scroll horizontally */ + wmove(win, row, 0); /* move cursor to correct line */ + waddch(win, ' '); + waddnstr(win, line, MIN(strlen(line), width - 2)); + + getyx(win, y, x); + /* Clear 'residue' of previous line */ +#if OLD_NCURSES + { + int i; + for (i = 0; i < width - x; i++) + waddch(win, ' '); + } +#else + wclrtoeol(win); +#endif +} + +/* + * Return current line of text. Called by dialog_textbox() and print_line(). + * 'page' should point to start of current line before calling, and will be + * updated to point to start of next line. + */ +static char *get_line(void) +{ + int i = 0; + static char line[MAX_LEN + 1]; + + end_reached = 0; + while (*page != '\n') { + if (*page == '\0') { + if (!end_reached) { + end_reached = 1; + break; + } + } else if (i < MAX_LEN) + line[i++] = *(page++); + else { + /* Truncate lines longer than MAX_LEN characters */ + if (i == MAX_LEN) + line[i++] = '\0'; + page++; + } + } + if (i <= MAX_LEN) + line[i] = '\0'; + if (!end_reached) + page++; /* move pass '\n' */ + + return line; +} + +/* + * Print current position + */ +static void print_position(WINDOW * win) +{ + int percent; + + wattrset(win, dlg.position_indicator.atr); + wbkgdset(win, dlg.position_indicator.atr & A_COLOR); + percent = (page - buf) * 100 / strlen(buf); + wmove(win, getmaxy(win) - 3, getmaxx(win) - 9); + wprintw(win, "(%3d%%)", percent); +} |