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// SPDX-License-Identifier: GPL-2.0+ /* * 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) */ #include "dialog.h" static void back_lines(int n); static void print_page(WINDOW *win, int height, int width, update_text_fn update_text, void *data); 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 char *buf; static char *page; /* * refresh window content */ static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw, int cur_y, int cur_x, update_text_fn update_text, void *data) { print_page(box, boxh, boxw, update_text, data); print_position(dialog); wmove(dialog, cur_y, cur_x); /* Restore cursor position */ wrefresh(dialog); } /* * Display text from a file in a dialog box. * * keys is a null-terminated array * update_text() may not add or remove any '\n' or '\0' in tbuf */ int dialog_textbox(const char *title, char *tbuf, int initial_height, int initial_width, int *keys, int *_vscroll, int *_hscroll, update_text_fn update_text, void *data) { int i, x, y, cur_x, cur_y, key = 0; int height, width, boxh, boxw; WINDOW *dialog, *box; bool done = false; 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 */ if (_vscroll && *_vscroll) { begin_reached = 0; for (i = 0; i < *_vscroll; i++) get_line(); } if (_hscroll) hscroll = *_hscroll; do_resize: getmaxyx(stdscr, height, width); if (height < TEXTBOX_HEIGTH_MIN || width < TEXTBOX_WIDTH_MIN) 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 = (getmaxx(stdscr) - width) / 2; y = (getmaxy(stdscr) - 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, " 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, update_text, data); while (!done) { key = wgetch(dialog); switch (key) { case 'E': /* Exit */ case 'e': case 'X': case 'x': case 'q': case '\n': done = true; break; 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, update_text, data); } 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, update_text, data); break; case 'K': /* Previous line */ case 'k': case KEY_UP: if (begin_reached) break; back_lines(page_length + 1); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case 'B': /* Previous page */ case 'b': case 'u': case KEY_PPAGE: if (begin_reached) break; back_lines(page_length + boxh); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case 'J': /* Next line */ case 'j': case KEY_DOWN: if (end_reached) break; back_lines(page_length - 1); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case KEY_NPAGE: /* Next page */ case ' ': case 'd': if (end_reached) break; begin_reached = 0; refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); 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, update_text, data); 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, update_text, data); break; case KEY_ESC: if (on_key_esc(dialog) == KEY_ESC) done = true; break; case KEY_RESIZE: back_lines(height); delwin(box); delwin(dialog); on_key_resize(); goto do_resize; default: for (i = 0; keys[i]; i++) { if (key == keys[i]) { done = true; break; } } } } delwin(box); delwin(dialog); if (_vscroll) { const char *s; s = buf; *_vscroll = 0; back_lines(page_length); while (s < page && (s = strchr(s, '\n'))) { (*_vscroll)++; s++; } } if (_hscroll) *_hscroll = hscroll; return key; } /* * 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. */ static void print_page(WINDOW *win, int height, int width, update_text_fn update_text, void *data) { int i, passed_end = 0; if (update_text) { char *end; for (i = 0; i < height; i++) get_line(); end = page; back_lines(height); update_text(buf, page - buf, end - buf, data); } 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. */ static void print_line(WINDOW * win, int row, int width) { 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)); /* Clear 'residue' of previous line */ #if OLD_NCURSES { int x = getcurx(win); 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') { 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 past '\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); }
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