mc/lib/widget/label.c

/*
   Widgets for the Midnight Commander

   Copyright (C) 1994-2024
   Free Software Foundation, Inc.

   Authors:
   Radek Doulik, 1994, 1995
   Miguel de Icaza, 1994, 1995
   Jakub Jelinek, 1995
   Andrej Borsenkow, 1996
   Norbert Warmuth, 1997
   Andrew Borodin <aborodin@vmail.ru>, 2009-2022

   This file is part of the Midnight Commander.

   The Midnight Commander 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 3 of the License,
   or (at your option) any later version.

   The Midnight Commander 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, see <http://www.gnu.org/licenses/>.
 */

/** \file label.c
 *  \brief Source: WLabel widget
 */

#include <config.h>

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

#include "lib/global.h"

#include "lib/tty/tty.h"
#include "lib/tty/color.h"
#include "lib/skin.h"
#include "lib/strutil.h"
#include "lib/widget.h"

/*** global variables ****************************************************************************/

/*** file scope macro definitions ****************************************************************/

/*** file scope type declarations ****************************************************************/

/*** forward declarations (file scope functions) *************************************************/

/*** file scope variables ************************************************************************/

/* --------------------------------------------------------------------------------------------- */
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */

static cb_ret_t
label_callback (Widget *w, Widget *sender, widget_msg_t msg, int parm, void *data)
{
    WLabel *l = LABEL (w);

    switch (msg)
    {
    case MSG_DRAW:
    {
        char *p = l->text;
        int y = 0;
        gboolean disabled;
        align_crt_t align;

        if (l->text == NULL)
            return MSG_HANDLED;

        disabled = widget_get_state (w, WST_DISABLED);

        if (l->transparent)
            tty_setcolor (disabled ? DISABLED_COLOR : DEFAULT_COLOR);
        else
        {
            const int *colors;

            colors = widget_get_colors (w);
            tty_setcolor (disabled ? DISABLED_COLOR : colors[DLG_COLOR_NORMAL]);
        }

        align = (w->pos_flags & WPOS_CENTER_HORZ) != 0 ? J_CENTER_LEFT : J_LEFT;

        while (TRUE)
        {
            char *q;
            char c = '\0';

            q = strchr (p, '\n');
            if (q != NULL)
            {
                c = q[0];
                q[0] = '\0';
            }

            widget_gotoyx (w, y, 0);
            tty_print_string (str_fit_to_term (p, w->rect.cols, align));

            if (q == NULL)
                break;

            q[0] = c;
            p = q + 1;
            y++;
        }
        return MSG_HANDLED;
    }

    case MSG_DESTROY:
        g_free (l->text);
        return MSG_HANDLED;

    default:
        return widget_default_callback (w, sender, msg, parm, data);
    }
}

/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */

WLabel *
label_new (int y, int x, const char *text)
{
    WRect r = { y, x, 1, 1 };
    WLabel *l;
    Widget *w;

    if (text != NULL)
        str_msg_term_size (text, &r.lines, &r.cols);

    l = g_new (WLabel, 1);
    w = WIDGET (l);
    widget_init (w, &r, label_callback, NULL);

    l->text = g_strdup (text);
    l->auto_adjust_cols = TRUE;
    l->transparent = FALSE;

    return l;
}

/* --------------------------------------------------------------------------------------------- */

void
label_set_text (WLabel *label, const char *text)
{
    Widget *w = WIDGET (label);
    int newcols = w->rect.cols;
    int newlines;

    if (label->text != NULL && text != NULL && strcmp (label->text, text) == 0)
        return; /* Flickering is not nice */

    g_free (label->text);

    if (text == NULL)
        label->text = NULL;
    else
    {
        label->text = g_strdup (text);
        if (label->auto_adjust_cols)
        {
            str_msg_term_size (text, &newlines, &newcols);
            w->rect.cols = MAX (newcols, w->rect.cols);
            w->rect.lines = MAX (newlines, w->rect.lines);
        }
    }

    widget_draw (w);

    w->rect.cols = MIN (newcols, w->rect.cols);
}

/* --------------------------------------------------------------------------------------------- */

void
label_set_textv (WLabel *label, const char *format, ...)
{
    va_list args;
    char buf[BUF_1K]; /* FIXME: is it enough? */

    va_start (args, format);
    g_vsnprintf (buf, sizeof (buf), format, args);
    va_end (args);

    label_set_text (label, buf);
}

/* --------------------------------------------------------------------------------------------- */