gmenu.c

/**
 * gmenu.c -- goaccess menus
 * Copyright (C) 2009-2014 by Gerardo Orellana <goaccess@prosoftcorp.com>
 * GoAccess - An Ncurses apache weblog analyzer & interactive viewer
 *
 * 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.
 *
 * A copy of the GNU General Public License is attached to this
 * source distribution for its full text.
 *
 * Visit http://goaccess.prosoftcorp.com for new releases.
 */

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

#include "gmenu.h"

#include "error.h"
#include "xmalloc.h"
#include "settings.h"
#include "util.h"
#include "ui.h"

/* allocate memory for a new GMenu instance */
GMenu *
new_gmenu (WINDOW * parent, int h, int w, int y, int x)
{
  GMenu *menu = xmalloc (sizeof (GMenu));

  memset (menu, 0, sizeof *menu);
  menu->count = 0;
  menu->idx = 0;
  menu->multiple = 0;
  menu->selectable = 0;
  menu->start = 0;
  menu->status = 0;

  menu->h = h;
  menu->w = w;
  menu->x = x;
  menu->y = y;
  menu->win = derwin (parent, menu->h, menu->w, menu->y, menu->x);

  return menu;
}

/* render an actual menu item */
static void
draw_menu_item (GMenu * menu, char *s, int x, int y, int w, int color,
                int checked)
{
  char check, *lbl = NULL;
  if (menu->selectable) {
    check = checked ? 'x' : ' ';
    lbl = xmalloc (snprintf (NULL, 0, "[%c] %s", check, s) + 1);
    sprintf (lbl, "[%c] %s", check, s);
    draw_header (menu->win, lbl, "%s", y, x, w, color, 0);
    free (lbl);
  } else {
    draw_header (menu->win, s, "%s", y, x, w, color, 0);
  }
}

/* displays a menu to its associated window */
int
post_gmenu (GMenu * menu)
{
  int i = 0, j = 0, k = 0, start, end, height, total, checked = 0;
  if (menu == NULL)
    return 1;

  werase (menu->win);

  height = menu->h;
  start = menu->start;
  total = menu->size;
  end = height < total ? start + height : total;
  for (i = start; i < end; i++, j++) {
    k = i == menu->idx ? 1 : 0;
    checked = menu->items[i].checked ? 1 : 0;
    draw_menu_item (menu, menu->items[i].name, 0, j, menu->w, k, checked);
  }
  wrefresh (menu->win);
  return 0;
}

/* main work horse of the menu system processing input events */
void
gmenu_driver (GMenu * menu, int c)
{
  int i;
  switch (c) {
   case REQ_DOWN:
     if (menu->idx >= menu->size - 1)
       break;
     ++menu->idx;
     if (menu->idx >= menu->h && menu->idx >= menu->start + menu->h)
       menu->start++;
     post_gmenu (menu);
     break;
   case REQ_UP:
     if (menu->idx <= 0)
       break;
     --menu->idx;
     if (menu->idx < menu->start)
       --menu->start;
     post_gmenu (menu);
     break;
   case REQ_SEL:
     if (!menu->multiple) {
       for (i = 0; i < menu->size; i++)
         menu->items[i].checked = 0;
     }
     if (menu->items[menu->idx].checked)
       menu->items[menu->idx].checked = 0;
     else
       menu->items[menu->idx].checked = 1;
     post_gmenu (menu);
     break;
  }
}