root/lxdialog/util.c

/*
 *  util.c
 *
 *  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"


/* use colors by default? */
bool use_colors = 1;

const char *backtitle = NULL;

const char *dialog_result;

/* 
 * Attribute values, default is for mono display
 */
chtype attributes[] =
{
    A_NORMAL,                   /* screen_attr */
    A_NORMAL,                   /* shadow_attr */
    A_NORMAL,                   /* dialog_attr */
    A_BOLD,                     /* title_attr */
    A_NORMAL,                   /* border_attr */
    A_REVERSE,                  /* button_active_attr */
    A_DIM,                      /* button_inactive_attr */
    A_REVERSE,                  /* button_key_active_attr */
    A_BOLD,                     /* button_key_inactive_attr */
    A_REVERSE,                  /* button_label_active_attr */
    A_NORMAL,                   /* button_label_inactive_attr */
    A_NORMAL,                   /* inputbox_attr */
    A_NORMAL,                   /* inputbox_border_attr */
    A_NORMAL,                   /* searchbox_attr */
    A_BOLD,                     /* searchbox_title_attr */
    A_NORMAL,                   /* searchbox_border_attr */
    A_BOLD,                     /* position_indicator_attr */
    A_NORMAL,                   /* menubox_attr */
    A_NORMAL,                   /* menubox_border_attr */
    A_NORMAL,                   /* item_attr */
    A_REVERSE,                  /* item_selected_attr */
    A_BOLD,                     /* tag_attr */
    A_REVERSE,                  /* tag_selected_attr */
    A_BOLD,                     /* tag_key_attr */
    A_REVERSE,                  /* tag_key_selected_attr */
    A_BOLD,                     /* check_attr */
    A_REVERSE,                  /* check_selected_attr */
    A_BOLD,                     /* uarrow_attr */
    A_BOLD                      /* darrow_attr */
};


#include "colors.h"

/*
 * Table of color values
 */
int color_table[][3] =
{
    {SCREEN_FG, SCREEN_BG, SCREEN_HL},
    {SHADOW_FG, SHADOW_BG, SHADOW_HL},
    {DIALOG_FG, DIALOG_BG, DIALOG_HL},
    {TITLE_FG, TITLE_BG, TITLE_HL},
    {BORDER_FG, BORDER_BG, BORDER_HL},
    {BUTTON_ACTIVE_FG, BUTTON_ACTIVE_BG, BUTTON_ACTIVE_HL},
    {BUTTON_INACTIVE_FG, BUTTON_INACTIVE_BG, BUTTON_INACTIVE_HL},
    {BUTTON_KEY_ACTIVE_FG, BUTTON_KEY_ACTIVE_BG, BUTTON_KEY_ACTIVE_HL},
    {BUTTON_KEY_INACTIVE_FG, BUTTON_KEY_INACTIVE_BG, BUTTON_KEY_INACTIVE_HL},
    {BUTTON_LABEL_ACTIVE_FG, BUTTON_LABEL_ACTIVE_BG, BUTTON_LABEL_ACTIVE_HL},
    {BUTTON_LABEL_INACTIVE_FG, BUTTON_LABEL_INACTIVE_BG,
     BUTTON_LABEL_INACTIVE_HL},
    {INPUTBOX_FG, INPUTBOX_BG, INPUTBOX_HL},
    {INPUTBOX_BORDER_FG, INPUTBOX_BORDER_BG, INPUTBOX_BORDER_HL},
    {SEARCHBOX_FG, SEARCHBOX_BG, SEARCHBOX_HL},
    {SEARCHBOX_TITLE_FG, SEARCHBOX_TITLE_BG, SEARCHBOX_TITLE_HL},
    {SEARCHBOX_BORDER_FG, SEARCHBOX_BORDER_BG, SEARCHBOX_BORDER_HL},
    {POSITION_INDICATOR_FG, POSITION_INDICATOR_BG, POSITION_INDICATOR_HL},
    {MENUBOX_FG, MENUBOX_BG, MENUBOX_HL},
    {MENUBOX_BORDER_FG, MENUBOX_BORDER_BG, MENUBOX_BORDER_HL},
    {ITEM_FG, ITEM_BG, ITEM_HL},
    {ITEM_SELECTED_FG, ITEM_SELECTED_BG, ITEM_SELECTED_HL},
    {TAG_FG, TAG_BG, TAG_HL},
    {TAG_SELECTED_FG, TAG_SELECTED_BG, TAG_SELECTED_HL},
    {TAG_KEY_FG, TAG_KEY_BG, TAG_KEY_HL},
    {TAG_KEY_SELECTED_FG, TAG_KEY_SELECTED_BG, TAG_KEY_SELECTED_HL},
    {CHECK_FG, CHECK_BG, CHECK_HL},
    {CHECK_SELECTED_FG, CHECK_SELECTED_BG, CHECK_SELECTED_HL},
    {UARROW_FG, UARROW_BG, UARROW_HL},
    {DARROW_FG, DARROW_BG, DARROW_HL},
};                              /* color_table */

/*
 * Set window to attribute 'attr'
 */
void
attr_clear (WINDOW * win, int height, int width, chtype attr)
{
    int i, j;

    wattrset (win, attr);
    for (i = 0; i < height; i++) {
        wmove (win, i, 0);
        for (j = 0; j < width; j++)
            waddch (win, ' ');
    }
    touchwin (win);
}

void dialog_clear (void)
{
    attr_clear (stdscr, LINES, COLS, screen_attr);
    /* Display background title if it exists ... - SLH */
    if (backtitle != NULL) {
        int i;

        wattrset (stdscr, screen_attr);
        mvwaddstr (stdscr, 0, 1, (char *)backtitle);
        wmove (stdscr, 1, 1);
        for (i = 1; i < COLS - 1; i++)
            waddch (stdscr, ACS_HLINE);
    }
    wnoutrefresh (stdscr);
}

/*
 * Do some initialization for dialog
 */
void
init_dialog (void)
{
    initscr ();                 /* Init curses */
    keypad (stdscr, TRUE);
    cbreak ();
    noecho ();


    if (use_colors)     /* Set up colors */
        color_setup ();


    dialog_clear ();
}

/*
 * Setup for color display
 */
void
color_setup (void)
{
    int i;

    if (has_colors ()) {        /* Terminal supports color? */
        start_color ();

        /* Initialize color pairs */
        for (i = 0; i < ATTRIBUTE_COUNT; i++)
            init_pair (i + 1, color_table[i][0], color_table[i][1]);

        /* Setup color attributes */
        for (i = 0; i < ATTRIBUTE_COUNT; i++)
            attributes[i] = C_ATTR (color_table[i][2], i + 1);
    }
}

/*
 * End using dialog functions.
 */
void
end_dialog (void)
{
    endwin ();
}


/*
 * Print a string of text in a window, automatically wrap around to the
 * next line if the string is too long to fit on one line. Newline
 * characters '\n' are replaced by spaces.  We start on a new line
 * if there is no room for at least 4 nonblanks following a double-space.
 */
void
print_autowrap (WINDOW * win, const char *prompt, int width, int y, int x)
{
    int newl, cur_x, cur_y;
    int i, prompt_len, room, wlen;
    char tempstr[MAX_LEN + 1], *word, *sp, *sp2;

    strcpy (tempstr, prompt);

    prompt_len = strlen(tempstr);
        
    /*
     * Remove newlines
     */
    for(i=0; i<prompt_len; i++) {
        if(tempstr[i] == '\n') tempstr[i] = ' ';
    }

    if (prompt_len <= width - x * 2) {  /* If prompt is short */
        wmove (win, y, (width - prompt_len) / 2);
        waddstr (win, tempstr);
    } else {
        cur_x = x;
        cur_y = y;
        newl = 1;
        word = tempstr;
        while (word && *word) {
            sp = index(word, ' ');
            if (sp)
                *sp++ = 0;

            /* Wrap to next line if either the word does not fit,
               or it is the first word of a new sentence, and it is
               short, and the next word does not fit. */
            room = width - cur_x;
            wlen = strlen(word);
            if (wlen > room ||
               (newl && wlen < 4 && sp && wlen+1+strlen(sp) > room
                     && (!(sp2 = index(sp, ' ')) || wlen+1+(sp2-sp) > room))) {
                cur_y++;
                cur_x = x;
            }
            wmove (win, cur_y, cur_x);
            waddstr (win, word);
            getyx (win, cur_y, cur_x);
            cur_x++;
            if (sp && *sp == ' ') {
                cur_x++;        /* double space */
                while (*++sp == ' ');
                newl = 1;
            } else
                newl = 0;
            word = sp;
        }
    }
}

/*
 * Print a button
 */
void
print_button (WINDOW * win, const char *label, int y, int x, int selected)
{
    int i, temp;

    wmove (win, y, x);
    wattrset (win, selected ? button_active_attr : button_inactive_attr);
    waddstr (win, "<");
    temp = strspn (label, " ");
    label += temp;
    wattrset (win, selected ? button_label_active_attr
              : button_label_inactive_attr);
    for (i = 0; i < temp; i++)
        waddch (win, ' ');
    wattrset (win, selected ? button_key_active_attr
              : button_key_inactive_attr);
    waddch (win, label[0]);
    wattrset (win, selected ? button_label_active_attr
              : button_label_inactive_attr);
    waddstr (win, (char *)label + 1);
    wattrset (win, selected ? button_active_attr : button_inactive_attr);
    waddstr (win, ">");
    wmove (win, y, x + temp + 1);
}

/*
 * Draw a rectangular box with line drawing characters
 */
void
draw_box (WINDOW * win, int y, int x, int height, int width,
          chtype box, chtype border)
{
    int i, j;

    wattrset (win, 0);
    for (i = 0; i < height; i++) {
        wmove (win, y + i, x);
        for (j = 0; j < width; j++)
            if (!i && !j)
                waddch (win, border | ACS_ULCORNER);
            else if (i == height - 1 && !j)
                waddch (win, border | ACS_LLCORNER);
            else if (!i && j == width - 1)
                waddch (win, box | ACS_URCORNER);
            else if (i == height - 1 && j == width - 1)
                waddch (win, box | ACS_LRCORNER);
            else if (!i)
                waddch (win, border | ACS_HLINE);
            else if (i == height - 1)
                waddch (win, box | ACS_HLINE);
            else if (!j)
                waddch (win, border | ACS_VLINE);
            else if (j == width - 1)
                waddch (win, box | ACS_VLINE);
            else
                waddch (win, box | ' ');
    }
}

/*
 * Draw shadows along the right and bottom edge to give a more 3D look
 * to the boxes
 */
void
draw_shadow (WINDOW * win, int y, int x, int height, int width)
{
    int i;

    if (has_colors ()) {        /* Whether terminal supports color? */
        wattrset (win, shadow_attr);
        wmove (win, y + height, x + 2);
        for (i = 0; i < width; i++)
            waddch (win, winch (win) & A_CHARTEXT);
        for (i = y + 1; i < y + height + 1; i++) {
            wmove (win, i, x + width);
            waddch (win, winch (win) & A_CHARTEXT);
            waddch (win, winch (win) & A_CHARTEXT);
        }
        wnoutrefresh (win);
    }
}

/*
 *  Return the position of the first alphabetic character in a string.
 */
int
first_alpha(const char *string, const char *exempt)
{
        int i, in_paren=0, c;

        for (i = 0; i < strlen(string); i++) {
                c = tolower(string[i]);

                if (strchr("<[(", c)) ++in_paren;
                if (strchr(">])", c)) --in_paren;

                if ((! in_paren) && isalpha(c) && 
                     strchr(exempt, c) == 0)
                        return i;
        }

        return 0;
}