[mgLib] / msg.c

/* -*-c-*-
 *
 * $Id: msg.c,v 1.9 2002/01/13 14:32:22 mdw Exp $
 *
 * Display a message and get an answer
 *
 * (c) 1998 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of the mgLib GTK utilities library.
 *
 * mgLib is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * mgLib 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 Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with mgLib; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: msg.c,v $
 * Revision 1.9  2002/01/13 14:32:22  mdw
 * Allow control over the message box title.
 *
 * Revision 1.8  1999/11/11 19:54:37  mdw
 * Prep for standalone release.
 *
 * Revision 1.7  1999/05/21 22:08:20  mdw
 * Take advantage of new dynamic string macros.
 *
 * Revision 1.6  1999/05/06 19:51:48  mdw
 * Reformatted the LGPL notice a little bit.
 *
 * Revision 1.5  1999/05/05 18:52:45  mdw
 * Change licensing conditions to LGPL.
 *
 * Revision 1.4  1999/04/29 20:48:13  mdw
 * Add documentation for `msg'.
 *
 * Revision 1.3  1999/03/25 23:36:10  mdw
 * Compile to nothing in absence of GTK, for the benefit of parent packages
 * which contain non-GTK-dependent parts.
 *
 * Revision 1.2  1998/12/15 23:48:06  mdw
 * Use `dstr_putf' for formatting, rather than `sprintf'.
 *
 * Revision 1.1  1998/12/11 09:44:21  mdw
 * Initial version.
 *
 */

/*----- Header files ------------------------------------------------------*/

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

#include <gtk/gtk.h>

#include <mLib/alloc.h>
#include <mLib/dstr.h>

#include "cancel.h"
#include "mdwfocus.h"
#include "msg.h"

/*----- Static variables --------------------------------------------------*/

static int reply;
static int creply;

/*----- Main code ---------------------------------------------------------*/

/* --- @msg@ --- *
 *
 * Arguments:   @const char *title@ = the title for the message box
 *              @const char *buttons@ = the button strings to display
 *              @const char *msg@ = the message skeleton string
 *
 * Returns:     Index of the button selected.
 *
 * Use:         Displays a message to the user in a nice dialogue box and
 *              returns the index of the button selected.
 *
 *              The @msg@ argument is a @printf@-style format string, which
 *              contains the message to actually be shown.  The @buttons@
 *              argument is a comma-separated list of buttons to be drawn,
 *              from right to left.  A button name can be preceded with `:'
 *              to indicate that it's the default, or `~' if it's the
 *              `cancel' button.  The return value is the zero-based index
 *              of the button selected.
 */

static int close(GtkWidget *w, gpointer p)
{
  reply = creply;
  gtk_main_quit();
  return (1);
}

static void click(GtkWidget *w, gpointer p)
{
  reply = (int)p;
  gtk_main_quit();
}

int msg(const char *title, const char *buttons, const char *msg, ...)
{
  GtkWidget *dbox, *w;

  /* --- Make most of the dialogue box --- */

  dbox = gtk_dialog_new();
  gtk_window_set_title(GTK_WINDOW(dbox), title);
  gtk_signal_connect(GTK_OBJECT(dbox), "delete_event",
                     GTK_SIGNAL_FUNC(close), 0);
  gtk_box_set_homogeneous(GTK_BOX(GTK_DIALOG(dbox)->action_area), 0);  

  /* --- Set up the message string --- */

  {
    dstr d = DSTR_INIT;
    va_list ap;

    va_start(ap, msg);
    dstr_vputf(&d, msg, ap);
    va_end(ap);
    w = gtk_label_new(d.buf);
    gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dbox)->vbox), w, 1, 1, 0);
    gtk_window_position(GTK_WINDOW(dbox), GTK_WIN_POS_MOUSE);
    gtk_widget_show(w);
    gtk_misc_set_padding(GTK_MISC(w), 16, 16);
    dstr_destroy(&d);
  }

  /* --- Set up the buttons --- */

  {
    char *p = xstrdup(buttons);
    unsigned f = 0;
    int i = 0;

#define f_ok 1u
#define f_cancel 2u
#define f_mdwfocus 4u

    if (*p == '!') {
      f |= f_mdwfocus;
      p++;
    }

    creply = -1;

    for (p = strtok(p, ","); p; p = strtok(0, ","), i++) {
      unsigned ff = 0;
      if (*p == ':') {
        ff |= f_ok;
        p++;
      }
      if (*p == '~') {
        ff |= f_cancel;
        creply = i;
        p++;
      }
      w = gtk_button_new_with_label(p);
      GTK_WIDGET_SET_FLAGS(w, GTK_CAN_DEFAULT);
      gtk_box_pack_end(GTK_BOX(GTK_DIALOG(dbox)->action_area), w, 0, 0, 0);
      gtk_signal_connect(GTK_OBJECT(w), "clicked",
                         GTK_SIGNAL_FUNC(click), (gpointer)i);
      if (ff & f_ok)
        gtk_widget_grab_default(w);
      if (ff & f_cancel)
        cancel(GTK_WINDOW(dbox), w);
      gtk_widget_show(w);
    }
    free(p);

    /* --- Preflight checklist --- */

    gtk_widget_realize(dbox);
    if (f & f_mdwfocus)
      mdwfocus(dbox);

#undef f_ok
#undef f_cancel
#undef f_mdwfocus
  }

  /* --- Ready --- */

  gtk_grab_add(GTK_WIDGET(dbox));
  gtk_widget_show(dbox);
  gtk_main();
  gtk_grab_remove(GTK_WIDGET(dbox));
  gtk_widget_destroy(dbox);
  return (reply);
}

/*----- That's all, folks -------------------------------------------------*/