root/scripts/kconfig/nconf.gui.c

DEFINITIONS

1. set_normal_colors
2. normal_color_theme
3. no_colors_theme
4. set_colors
5. print_in_middle
6. get_line_no
7. get_line
8. get_line_length
9. fill_window
10. btn_dialog
11. dialog_inputbox
12. refresh_all_windows
13. show_scroll_win

/*
 * Copyright (C) 2008 Nir Tzachar <nir.tzachar@gmail.com?
 * Released under the terms of the GNU GPL v2.0.
 *
 * Derived from menuconfig.
 *
 */
#include "nconf.h"

/* a list of all the different widgets we use */
attributes_t attributes[ATTR_MAX+1] = {0};

/* available colors:
   COLOR_BLACK   0
   COLOR_RED     1
   COLOR_GREEN   2
   COLOR_YELLOW  3
   COLOR_BLUE    4
   COLOR_MAGENTA 5
   COLOR_CYAN    6
   COLOR_WHITE   7
   */
static void set_normal_colors(void)
{
        init_pair(NORMAL, -1, -1);
        init_pair(MAIN_HEADING, COLOR_MAGENTA, -1);

        /* FORE is for the selected item */
        init_pair(MAIN_MENU_FORE, -1, -1);
        /* BACK for all the rest */
        init_pair(MAIN_MENU_BACK, -1, -1);
        init_pair(MAIN_MENU_GREY, -1, -1);
        init_pair(MAIN_MENU_HEADING, COLOR_GREEN, -1);
        init_pair(MAIN_MENU_BOX, COLOR_YELLOW, -1);

        init_pair(SCROLLWIN_TEXT, -1, -1);
        init_pair(SCROLLWIN_HEADING, COLOR_GREEN, -1);
        init_pair(SCROLLWIN_BOX, COLOR_YELLOW, -1);

        init_pair(DIALOG_TEXT, -1, -1);
        init_pair(DIALOG_BOX, COLOR_YELLOW, -1);
        init_pair(DIALOG_MENU_BACK, COLOR_YELLOW, -1);
        init_pair(DIALOG_MENU_FORE, COLOR_RED, -1);

        init_pair(INPUT_BOX, COLOR_YELLOW, -1);
        init_pair(INPUT_HEADING, COLOR_GREEN, -1);
        init_pair(INPUT_TEXT, -1, -1);
        init_pair(INPUT_FIELD, -1, -1);

        init_pair(FUNCTION_HIGHLIGHT, -1, -1);
        init_pair(FUNCTION_TEXT, COLOR_YELLOW, -1);
}

/* available attributes:
   A_NORMAL        Normal display (no highlight)
   A_STANDOUT      Best highlighting mode of the terminal.
   A_UNDERLINE     Underlining
   A_REVERSE       Reverse video
   A_BLINK         Blinking
   A_DIM           Half bright
   A_BOLD          Extra bright or bold
   A_PROTECT       Protected mode
   A_INVIS         Invisible or blank mode
   A_ALTCHARSET    Alternate character set
   A_CHARTEXT      Bit-mask to extract a character
   COLOR_PAIR(n)   Color-pair number n
   */
static void normal_color_theme(void)
{
        /* automatically add color... */
#define mkattr(name, attr) do { \
attributes[name] = attr | COLOR_PAIR(name); } while (0)
        mkattr(NORMAL, NORMAL);
        mkattr(MAIN_HEADING, A_BOLD | A_UNDERLINE);

        mkattr(MAIN_MENU_FORE, A_REVERSE);
        mkattr(MAIN_MENU_BACK, A_NORMAL);
        mkattr(MAIN_MENU_GREY, A_NORMAL);
        mkattr(MAIN_MENU_HEADING, A_BOLD);
        mkattr(MAIN_MENU_BOX, A_NORMAL);

        mkattr(SCROLLWIN_TEXT, A_NORMAL);
        mkattr(SCROLLWIN_HEADING, A_BOLD);
        mkattr(SCROLLWIN_BOX, A_BOLD);

        mkattr(DIALOG_TEXT, A_BOLD);
        mkattr(DIALOG_BOX, A_BOLD);
        mkattr(DIALOG_MENU_FORE, A_STANDOUT);
        mkattr(DIALOG_MENU_BACK, A_NORMAL);

        mkattr(INPUT_BOX, A_NORMAL);
        mkattr(INPUT_HEADING, A_BOLD);
        mkattr(INPUT_TEXT, A_NORMAL);
        mkattr(INPUT_FIELD, A_UNDERLINE);

        mkattr(FUNCTION_HIGHLIGHT, A_BOLD);
        mkattr(FUNCTION_TEXT, A_REVERSE);
}

static void no_colors_theme(void)
{
        /* automatically add highlight, no color */
#define mkattrn(name, attr) { attributes[name] = attr; }

        mkattrn(NORMAL, NORMAL);
        mkattrn(MAIN_HEADING, A_BOLD | A_UNDERLINE);

        mkattrn(MAIN_MENU_FORE, A_STANDOUT);
        mkattrn(MAIN_MENU_BACK, A_NORMAL);
        mkattrn(MAIN_MENU_GREY, A_NORMAL);
        mkattrn(MAIN_MENU_HEADING, A_BOLD);
        mkattrn(MAIN_MENU_BOX, A_NORMAL);

        mkattrn(SCROLLWIN_TEXT, A_NORMAL);
        mkattrn(SCROLLWIN_HEADING, A_BOLD);
        mkattrn(SCROLLWIN_BOX, A_BOLD);

        mkattrn(DIALOG_TEXT, A_NORMAL);
        mkattrn(DIALOG_BOX, A_BOLD);
        mkattrn(DIALOG_MENU_FORE, A_STANDOUT);
        mkattrn(DIALOG_MENU_BACK, A_NORMAL);

        mkattrn(INPUT_BOX, A_BOLD);
        mkattrn(INPUT_HEADING, A_BOLD);
        mkattrn(INPUT_TEXT, A_NORMAL);
        mkattrn(INPUT_FIELD, A_UNDERLINE);

        mkattrn(FUNCTION_HIGHLIGHT, A_BOLD);
        mkattrn(FUNCTION_TEXT, A_REVERSE);
}

void set_colors()
{
        start_color();
        use_default_colors();
        set_normal_colors();
        if (has_colors()) {
                normal_color_theme();
        } else {
                /* give defaults */
                no_colors_theme();
        }
}


/* this changes the windows attributes !!! */
void print_in_middle(WINDOW *win,
                int starty,
                int startx,
                int width,
                const char *string,
                chtype color)
{      int length, x, y;
        float temp;


        if (win == NULL)
                win = stdscr;
        getyx(win, y, x);
        if (startx != 0)
                x = startx;
        if (starty != 0)
                y = starty;
        if (width == 0)
                width = 80;

        length = strlen(string);
        temp = (width - length) / 2;
        x = startx + (int)temp;
        (void) wattrset(win, color);
        mvwprintw(win, y, x, "%s", string);
        refresh();
}

int get_line_no(const char *text)
{
        int i;
        int total = 1;

        if (!text)
                return 0;

        for (i = 0; text[i] != '\0'; i++)
                if (text[i] == '\n')
                        total++;
        return total;
}

const char *get_line(const char *text, int line_no)
{
        int i;
        int lines = 0;

        if (!text)
                return 0;

        for (i = 0; text[i] != '\0' && lines < line_no; i++)
                if (text[i] == '\n')
                        lines++;
        return text+i;
}

int get_line_length(const char *line)
{
        int res = 0;
        while (*line != '\0' && *line != '\n') {
                line++;
                res++;
        }
        return res;
}

/* print all lines to the window. */
void fill_window(WINDOW *win, const char *text)
{
        int x, y;
        int total_lines = get_line_no(text);
        int i;

        getmaxyx(win, y, x);
        /* do not go over end of line */
        total_lines = min(total_lines, y);
        for (i = 0; i < total_lines; i++) {
                char tmp[x+10];
                const char *line = get_line(text, i);
                int len = get_line_length(line);
                strncpy(tmp, line, min(len, x));
                tmp[len] = '\0';
                mvwprintw(win, i, 0, "%s", tmp);
        }
}

/* get the message, and buttons.
 * each button must be a char*
 * return the selected button
 *
 * this dialog is used for 2 different things:
 * 1) show a text box, no buttons.
 * 2) show a dialog, with horizontal buttons
 */
int btn_dialog(WINDOW *main_window, const char *msg, int btn_num, ...)
{
        va_list ap;
        char *btn;
        int btns_width = 0;
        int msg_lines = 0;
        int msg_width = 0;
        int total_width;
        int win_rows = 0;
        WINDOW *win;
        WINDOW *msg_win;
        WINDOW *menu_win;
        MENU *menu;
        ITEM *btns[btn_num+1];
        int i, x, y;
        int res = -1;


        va_start(ap, btn_num);
        for (i = 0; i < btn_num; i++) {
                btn = va_arg(ap, char *);
                btns[i] = new_item(btn, "");
                btns_width += strlen(btn)+1;
        }
        va_end(ap);
        btns[btn_num] = NULL;

        /* find the widest line of msg: */
        msg_lines = get_line_no(msg);
        for (i = 0; i < msg_lines; i++) {
                const char *line = get_line(msg, i);
                int len = get_line_length(line);
                if (msg_width < len)
                        msg_width = len;
        }

        total_width = max(msg_width, btns_width);
        /* place dialog in middle of screen */
        y = (getmaxy(stdscr)-(msg_lines+4))/2;
        x = (getmaxx(stdscr)-(total_width+4))/2;


        /* create the windows */
        if (btn_num > 0)
                win_rows = msg_lines+4;
        else
                win_rows = msg_lines+2;

        win = newwin(win_rows, total_width+4, y, x);
        keypad(win, TRUE);
        menu_win = derwin(win, 1, btns_width, win_rows-2,
                        1+(total_width+2-btns_width)/2);
        menu = new_menu(btns);
        msg_win = derwin(win, win_rows-2, msg_width, 1,
                        1+(total_width+2-msg_width)/2);

        set_menu_fore(menu, attributes[DIALOG_MENU_FORE]);
        set_menu_back(menu, attributes[DIALOG_MENU_BACK]);

        (void) wattrset(win, attributes[DIALOG_BOX]);
        box(win, 0, 0);

        /* print message */
        (void) wattrset(msg_win, attributes[DIALOG_TEXT]);
        fill_window(msg_win, msg);

        set_menu_win(menu, win);
        set_menu_sub(menu, menu_win);
        set_menu_format(menu, 1, btn_num);
        menu_opts_off(menu, O_SHOWDESC);
        menu_opts_off(menu, O_SHOWMATCH);
        menu_opts_on(menu, O_ONEVALUE);
        menu_opts_on(menu, O_NONCYCLIC);
        set_menu_mark(menu, "");
        post_menu(menu);


        touchwin(win);
        refresh_all_windows(main_window);
        while ((res = wgetch(win))) {
                switch (res) {
                case KEY_LEFT:
                        menu_driver(menu, REQ_LEFT_ITEM);
                        break;
                case KEY_RIGHT:
                        menu_driver(menu, REQ_RIGHT_ITEM);
                        break;
                case 10: /* ENTER */
                case 27: /* ESCAPE */
                case ' ':
                case KEY_F(F_BACK):
                case KEY_F(F_EXIT):
                        break;
                }
                touchwin(win);
                refresh_all_windows(main_window);

                if (res == 10 || res == ' ') {
                        res = item_index(current_item(menu));
                        break;
                } else if (res == 27 || res == KEY_F(F_BACK) ||
                                res == KEY_F(F_EXIT)) {
                        res = KEY_EXIT;
                        break;
                }
        }

        unpost_menu(menu);
        free_menu(menu);
        for (i = 0; i < btn_num; i++)
                free_item(btns[i]);

        delwin(win);
        return res;
}

int dialog_inputbox(WINDOW *main_window,
                const char *title, const char *prompt,
                const char *init, char **resultp, int *result_len)
{
        int prompt_lines = 0;
        int prompt_width = 0;
        WINDOW *win;
        WINDOW *prompt_win;
        WINDOW *form_win;
        PANEL *panel;
        int i, x, y;
        int res = -1;
        int cursor_position = strlen(init);
        int cursor_form_win;
        char *result = *resultp;

        if (strlen(init)+1 > *result_len) {
                *result_len = strlen(init)+1;
                *resultp = result = realloc(result, *result_len);
        }

        /* find the widest line of msg: */
        prompt_lines = get_line_no(prompt);
        for (i = 0; i < prompt_lines; i++) {
                const char *line = get_line(prompt, i);
                int len = get_line_length(line);
                prompt_width = max(prompt_width, len);
        }

        if (title)
                prompt_width = max(prompt_width, strlen(title));

        /* place dialog in middle of screen */
        y = (getmaxy(stdscr)-(prompt_lines+4))/2;
        x = (getmaxx(stdscr)-(prompt_width+4))/2;

        strncpy(result, init, *result_len);

        /* create the windows */
        win = newwin(prompt_lines+6, prompt_width+7, y, x);
        prompt_win = derwin(win, prompt_lines+1, prompt_width, 2, 2);
        form_win = derwin(win, 1, prompt_width, prompt_lines+3, 2);
        keypad(form_win, TRUE);

        (void) wattrset(form_win, attributes[INPUT_FIELD]);

        (void) wattrset(win, attributes[INPUT_BOX]);
        box(win, 0, 0);
        (void) wattrset(win, attributes[INPUT_HEADING]);
        if (title)
                mvwprintw(win, 0, 3, "%s", title);

        /* print message */
        (void) wattrset(prompt_win, attributes[INPUT_TEXT]);
        fill_window(prompt_win, prompt);

        mvwprintw(form_win, 0, 0, "%*s", prompt_width, " ");
        cursor_form_win = min(cursor_position, prompt_width-1);
        mvwprintw(form_win, 0, 0, "%s",
                  result + cursor_position-cursor_form_win);

        /* create panels */
        panel = new_panel(win);

        /* show the cursor */
        curs_set(1);

        touchwin(win);
        refresh_all_windows(main_window);
        while ((res = wgetch(form_win))) {
                int len = strlen(result);
                switch (res) {
                case 10: /* ENTER */
                case 27: /* ESCAPE */
                case KEY_F(F_HELP):
                case KEY_F(F_EXIT):
                case KEY_F(F_BACK):
                        break;
                case 127:
                case KEY_BACKSPACE:
                        if (cursor_position > 0) {
                                memmove(&result[cursor_position-1],
                                                &result[cursor_position],
                                                len-cursor_position+1);
                                cursor_position--;
                                cursor_form_win--;
                                len--;
                        }
                        break;
                case KEY_DC:
                        if (cursor_position >= 0 && cursor_position < len) {
                                memmove(&result[cursor_position],
                                                &result[cursor_position+1],
                                                len-cursor_position+1);
                                len--;
                        }
                        break;
                case KEY_UP:
                case KEY_RIGHT:
                        if (cursor_position < len) {
                                cursor_position++;
                                cursor_form_win++;
                        }
                        break;
                case KEY_DOWN:
                case KEY_LEFT:
                        if (cursor_position > 0) {
                                cursor_position--;
                                cursor_form_win--;
                        }
                        break;
                case KEY_HOME:
                        cursor_position = 0;
                        cursor_form_win = 0;
                        break;
                case KEY_END:
                        cursor_position = len;
                        cursor_form_win = min(cursor_position, prompt_width-1);
                        break;
                default:
                        if ((isgraph(res) || isspace(res))) {
                                /* one for new char, one for '\0' */
                                if (len+2 > *result_len) {
                                        *result_len = len+2;
                                        *resultp = result = realloc(result,
                                                                *result_len);
                                }
                                /* insert the char at the proper position */
                                memmove(&result[cursor_position+1],
                                                &result[cursor_position],
                                                len-cursor_position+1);
                                result[cursor_position] = res;
                                cursor_position++;
                                cursor_form_win++;
                                len++;
                        } else {
                                mvprintw(0, 0, "unknown key: %d\n", res);
                        }
                        break;
                }
                if (cursor_form_win < 0)
                        cursor_form_win = 0;
                else if (cursor_form_win > prompt_width-1)
                        cursor_form_win = prompt_width-1;

                wmove(form_win, 0, 0);
                wclrtoeol(form_win);
                mvwprintw(form_win, 0, 0, "%*s", prompt_width, " ");
                mvwprintw(form_win, 0, 0, "%s",
                        result + cursor_position-cursor_form_win);
                wmove(form_win, 0, cursor_form_win);
                touchwin(win);
                refresh_all_windows(main_window);

                if (res == 10) {
                        res = 0;
                        break;
                } else if (res == 27 || res == KEY_F(F_BACK) ||
                                res == KEY_F(F_EXIT)) {
                        res = KEY_EXIT;
                        break;
                } else if (res == KEY_F(F_HELP)) {
                        res = 1;
                        break;
                }
        }

        /* hide the cursor */
        curs_set(0);
        del_panel(panel);
        delwin(prompt_win);
        delwin(form_win);
        delwin(win);
        return res;
}

/* refresh all windows in the correct order */
void refresh_all_windows(WINDOW *main_window)
{
        update_panels();
        touchwin(main_window);
        refresh();
}

/* layman's scrollable window... */
void show_scroll_win(WINDOW *main_window,
                const char *title,
                const char *text)
{
        int res;
        int total_lines = get_line_no(text);
        int x, y, lines, columns;
        int start_x = 0, start_y = 0;
        int text_lines = 0, text_cols = 0;
        int total_cols = 0;
        int win_cols = 0;
        int win_lines = 0;
        int i = 0;
        WINDOW *win;
        WINDOW *pad;
        PANEL *panel;

        getmaxyx(stdscr, lines, columns);

        /* find the widest line of msg: */
        total_lines = get_line_no(text);
        for (i = 0; i < total_lines; i++) {
                const char *line = get_line(text, i);
                int len = get_line_length(line);
                total_cols = max(total_cols, len+2);
        }

        /* create the pad */
        pad = newpad(total_lines+10, total_cols+10);
        (void) wattrset(pad, attributes[SCROLLWIN_TEXT]);
        fill_window(pad, text);

        win_lines = min(total_lines+4, lines-2);
        win_cols = min(total_cols+2, columns-2);
        text_lines = max(win_lines-4, 0);
        text_cols = max(win_cols-2, 0);

        /* place window in middle of screen */
        y = (lines-win_lines)/2;
        x = (columns-win_cols)/2;

        win = newwin(win_lines, win_cols, y, x);
        keypad(win, TRUE);
        /* show the help in the help window, and show the help panel */
        (void) wattrset(win, attributes[SCROLLWIN_BOX]);
        box(win, 0, 0);
        (void) wattrset(win, attributes[SCROLLWIN_HEADING]);
        mvwprintw(win, 0, 3, " %s ", title);
        panel = new_panel(win);

        /* handle scrolling */
        do {

                copywin(pad, win, start_y, start_x, 2, 2, text_lines,
                                text_cols, 0);
                print_in_middle(win,
                                text_lines+2,
                                0,
                                text_cols,
                                "<OK>",
                                attributes[DIALOG_MENU_FORE]);
                wrefresh(win);

                res = wgetch(win);
                switch (res) {
                case KEY_NPAGE:
                case ' ':
                case 'd':
                        start_y += text_lines-2;
                        break;
                case KEY_PPAGE:
                case 'u':
                        start_y -= text_lines+2;
                        break;
                case KEY_HOME:
                        start_y = 0;
                        break;
                case KEY_END:
                        start_y = total_lines-text_lines;
                        break;
                case KEY_DOWN:
                case 'j':
                        start_y++;
                        break;
                case KEY_UP:
                case 'k':
                        start_y--;
                        break;
                case KEY_LEFT:
                case 'h':
                        start_x--;
                        break;
                case KEY_RIGHT:
                case 'l':
                        start_x++;
                        break;
                }
                if (res == 10 || res == 27 || res == 'q' ||
                        res == KEY_F(F_HELP) || res == KEY_F(F_BACK) ||
                        res == KEY_F(F_EXIT))
                        break;
                if (start_y < 0)
                        start_y = 0;
                if (start_y >= total_lines-text_lines)
                        start_y = total_lines-text_lines;
                if (start_x < 0)
                        start_x = 0;
                if (start_x >= total_cols-text_cols)
                        start_x = total_cols-text_cols;
        } while (res);

        del_panel(panel);
        delwin(win);
        refresh_all_windows(main_window);
}