path: root/calendar/gui/cal-search-bar.c

/* Evolution calendar - Search bar widget for calendar views
 *
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Author: Federico Mena-Quintero <federico@ximian.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <gtk/gtkmenu.h>
#include <gtk/gtkmenuitem.h>
#include <gtk/gtkoptionmenu.h>
#include <gtk/gtksignal.h>
#include <libgnome/gnome-i18n.h>
#include <gal/widgets/e-unicode.h>
#include <gal/util/e-util.h>
#include "cal-search-bar.h"



/* IDs and option items for the ESearchBar */
enum {
    SEARCH_ANY_FIELD_CONTAINS,
    SEARCH_SUMMARY_CONTAINS,
    SEARCH_DESCRIPTION_CONTAINS,
    SEARCH_COMMENT_CONTAINS,
    SEARCH_CATEGORY_IS,
};

static ESearchBarItem search_option_items[] = {
    { N_("Any field contains"), SEARCH_ANY_FIELD_CONTAINS, NULL },
    { N_("Summary contains"), SEARCH_SUMMARY_CONTAINS, NULL },
    { N_("Description contains"), SEARCH_DESCRIPTION_CONTAINS, NULL },
    { N_("Comment contains"), SEARCH_COMMENT_CONTAINS, NULL },
    { N_("Category is"), SEARCH_CATEGORY_IS, NULL },
    { NULL, -1, NULL }
};

/* IDs for the categories suboptions */
#define CATEGORIES_ALL 0
#define CATEGORIES_UNMATCHED 1
#define CATEGORIES_OFFSET 3

/* Private part of the CalSearchBar structure */
struct CalSearchBarPrivate {
    /* Array of categories */
    GPtrArray *categories;
};



static void cal_search_bar_class_init (CalSearchBarClass *class);
static void cal_search_bar_init (CalSearchBar *cal_search);
static void cal_search_bar_destroy (GtkObject *object);

static void cal_search_bar_search_activated (ESearchBar *search);

static ESearchBarClass *parent_class = NULL;

/* Signal IDs */
enum {
    SEXP_CHANGED,
    CATEGORY_CHANGED,
    LAST_SIGNAL
};

static guint cal_search_bar_signals[LAST_SIGNAL] = { 0 };



E_MAKE_TYPE (cal_search_bar, "CalSearchBar", CalSearchBar, cal_search_bar_class_init,
         cal_search_bar_init, E_SEARCH_BAR_TYPE);

/* Class initialization function for the calendar search bar */
static void
cal_search_bar_class_init (CalSearchBarClass *class)
{
    ESearchBarClass *e_search_bar_class;
    GtkObjectClass *object_class;

    e_search_bar_class = (ESearchBarClass *) class;
    object_class = (GtkObjectClass *) class;

    parent_class = g_type_class_peek_parent (class);

    cal_search_bar_signals[SEXP_CHANGED] =
        gtk_signal_new ("sexp_changed",
                GTK_RUN_FIRST,
                G_TYPE_FROM_CLASS (object_class),
                GTK_SIGNAL_OFFSET (CalSearchBarClass, sexp_changed),
                gtk_marshal_NONE__STRING,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_STRING);

    cal_search_bar_signals[CATEGORY_CHANGED] =
        gtk_signal_new ("category_changed",
                GTK_RUN_FIRST,
                G_TYPE_FROM_CLASS (object_class),
                GTK_SIGNAL_OFFSET (CalSearchBarClass, category_changed),
                gtk_marshal_NONE__STRING,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_STRING);

    class->sexp_changed = NULL;
    class->category_changed = NULL;

    e_search_bar_class->search_activated = cal_search_bar_search_activated;

    object_class->destroy = cal_search_bar_destroy;
}

/* Object initialization function for the calendar search bar */
static void
cal_search_bar_init (CalSearchBar *cal_search)
{
    CalSearchBarPrivate *priv;

    priv = g_new (CalSearchBarPrivate, 1);
    cal_search->priv = priv;

    priv->categories = g_ptr_array_new ();
    g_ptr_array_set_size (priv->categories, 0);
}

/* Frees an array of categories */
static void
free_categories (GPtrArray *categories)
{
    int i;

    for (i = 0; i < categories->len; i++) {
        g_assert (categories->pdata[i] != NULL);
        g_free (categories->pdata[i]);
    }

    g_ptr_array_free (categories, TRUE);
}

/* Destroy handler for the calendar search bar */
static void
cal_search_bar_destroy (GtkObject *object)
{
    CalSearchBar *cal_search;
    CalSearchBarPrivate *priv;

    g_return_if_fail (object != NULL);
    g_return_if_fail (IS_CAL_SEARCH_BAR (object));

    cal_search = CAL_SEARCH_BAR (object);
    priv = cal_search->priv;

    if (priv) {
        if (priv->categories) {
            free_categories (priv->categories);
            priv->categories = NULL;
        }
        
        g_free (priv);
        cal_search->priv = NULL;
    }
    
    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}



/* Emits the "sexp_changed" signal for the calendar search bar */
static void
notify_sexp_changed (CalSearchBar *cal_search, const char *sexp)
{
    gtk_signal_emit (GTK_OBJECT (cal_search), cal_search_bar_signals[SEXP_CHANGED],
             sexp);
}

/* Returns the string of the currently selected category, NULL for "Unmatched",
 * or (const char *) 1 for "All".
 */
static const char *
get_current_category (CalSearchBar *cal_search)
{
    CalSearchBarPrivate *priv;
    int id, subid;

    priv = cal_search->priv;

    g_assert (priv->categories != NULL);

    id = e_search_bar_get_item_id (E_SEARCH_BAR (cal_search));
    if (id != SEARCH_CATEGORY_IS)
        return NULL;

    subid = e_search_bar_get_subitem_id (E_SEARCH_BAR (cal_search));
    if (subid == CATEGORIES_ALL)
        return (const char *) 1;
    else if (subid == CATEGORIES_UNMATCHED)
        return NULL;
    else {
        int i;

        i = subid - CATEGORIES_OFFSET;
        g_assert (i >= 0 && i < priv->categories->len);

        return priv->categories->pdata[i];
    }
}

/* Sets the query string to be (contains? "field" "text") */
static void
notify_e_cal_view_contains (CalSearchBar *cal_search, const char *field)
{
    char *text;
    char *sexp;

    text = e_search_bar_get_text (E_SEARCH_BAR (cal_search));
    if (!text)
        return; /* This is an error in the UTF8 conversion, not an empty string! */

    sexp = g_strdup_printf ("(contains? \"%s\" \"%s\")", field, text);
    g_free (text);

    notify_sexp_changed (cal_search, sexp);
    g_free (sexp);
}

/* Returns a sexp for the selected category in the drop-down menu.  The "All"
 * option is returned as (const char *) 1, and the "Unfiled" option is returned
 * as NULL.
 */
static char *
get_category_sexp (CalSearchBar *cal_search)
{
    const char *category;

    category = get_current_category (cal_search);

    if (category == NULL)
        return g_strdup ("(has-categories? #f)"); /* Unfiled items */
    else if (category == (const char *) 1)
        return NULL; /* All items */
    else
        return g_strdup_printf ("(has-categories? \"%s\")", category); /* Specific category */
}

/* Sets the query string to the appropriate match for categories */
static void
notify_category_is (CalSearchBar *cal_search)
{
    char *sexp;

    sexp = get_category_sexp (cal_search);
    if (!sexp)
        notify_sexp_changed (cal_search, "#t"); /* Match all */
    else
        notify_sexp_changed (cal_search, sexp);

    if (sexp)
        g_free (sexp);
}

/* Creates a new query from the values in the widgets and notifies upstream */
static void
regen_query (CalSearchBar *cal_search)
{
    CalSearchBarPrivate *priv;
    int id;
    const char *category;

    priv = cal_search->priv;

    /* Fetch the data from the ESearchBar's entry widgets */

    id = e_search_bar_get_item_id (E_SEARCH_BAR (cal_search));

    /* Generate the different types of queries */

    switch (id) {
    case SEARCH_ANY_FIELD_CONTAINS:
        notify_e_cal_view_contains (cal_search, "any");
        break;

    case SEARCH_SUMMARY_CONTAINS:
        notify_e_cal_view_contains (cal_search, "summary");
        break;

    case SEARCH_DESCRIPTION_CONTAINS:
        notify_e_cal_view_contains (cal_search, "description");
        break;

    case SEARCH_COMMENT_CONTAINS:
        notify_e_cal_view_contains (cal_search, "comment");
        break;

    case SEARCH_CATEGORY_IS:
        notify_category_is (cal_search);

        category = cal_search_bar_get_category (cal_search);
        gtk_signal_emit (GTK_OBJECT (cal_search), cal_search_bar_signals[CATEGORY_CHANGED],
                 category);
        break;

    default:
        g_assert_not_reached ();
    }
}

/* search_activated handler for the calendar search bar */
static void
cal_search_bar_search_activated (ESearchBar *search)
{
    CalSearchBar *cal_search;

    cal_search = CAL_SEARCH_BAR (search);
    regen_query (cal_search);
}



/* Creates the suboptions menu for the ESearchBar with the list of categories */
static void
make_suboptions (CalSearchBar *cal_search)
{
    CalSearchBarPrivate *priv;
    ESearchBarSubitem *subitems;
    int i;

    priv = cal_search->priv;

    g_assert (priv->categories != NULL);

    /* Categories plus "all", "unmatched", separator, terminator */
    subitems = g_new (ESearchBarSubitem, priv->categories->len + 3 + 1);

    /* All, unmatched, separator */

    subitems[0].text = _("Any Category");
    subitems[0].id = CATEGORIES_ALL;
    subitems[0].translate = FALSE;

    subitems[1].text = _("Unmatched");
    subitems[1].id = CATEGORIES_UNMATCHED;
    subitems[1].translate = FALSE;

    /* All the other items */

    if (priv->categories->len > 0) {
        subitems[2].text = NULL; /* separator */
        subitems[2].id = 0;

        for (i = 0; i < priv->categories->len; i++) {
            const char *category;
            char *str;

            category = priv->categories->pdata[i];
            str = g_strdup (category ? category : "");

            subitems[i + CATEGORIES_OFFSET].text      = str;
            subitems[i + CATEGORIES_OFFSET].id        = i + CATEGORIES_OFFSET;
            subitems[i + CATEGORIES_OFFSET].translate = FALSE;
        }

        subitems[i + CATEGORIES_OFFSET].id = -1; /* terminator */
    } else
        subitems[2].id = -1; /* terminator */

    e_search_bar_set_suboption (E_SEARCH_BAR (cal_search), SEARCH_CATEGORY_IS, subitems);

    /* Free the strings */
    for (i = 0; i < priv->categories->len; i++)
        g_free (subitems[i + CATEGORIES_OFFSET].text);

    g_free (subitems);
}

/**
 * cal_search_bar_construct:
 * @cal_search: A calendar search bar.
 * 
 * Constructs a calendar search bar by binding its menu and option items.
 * 
 * Return value: The same value as @cal_search.
 **/
CalSearchBar *
cal_search_bar_construct (CalSearchBar *cal_search)
{
    g_return_val_if_fail (cal_search != NULL, NULL);
    g_return_val_if_fail (IS_CAL_SEARCH_BAR (cal_search), NULL);

    e_search_bar_construct (E_SEARCH_BAR (cal_search), NULL, search_option_items);
    make_suboptions (cal_search);

    e_search_bar_set_ids (E_SEARCH_BAR (cal_search), SEARCH_CATEGORY_IS, CATEGORIES_ALL);

    return cal_search;
}

/**
 * cal_search_bar_new:
 * 
 * Creates a new calendar search bar.
 * 
 * Return value: A newly-created calendar search bar.  You should connect to the
 * "sexp_changed" signal to monitor changes in the generated sexps.
 **/
GtkWidget *
cal_search_bar_new (void)
{
    CalSearchBar *cal_search;

    cal_search = g_object_new (TYPE_CAL_SEARCH_BAR, NULL);
    return GTK_WIDGET (cal_search_bar_construct (cal_search));
}

/* Used from qsort() */
static int
compare_categories_cb (const void *a, const void *b)
{
    const char **ca, **cb;

    ca = (const char **) a;
    cb = (const char **) b;

    /* FIXME: should use some utf8 strcoll() thingy */
    return strcmp (*ca, *cb);
}

/* Creates a sorted array of categories based on the original one; copies the
 * string values.
 */
static GPtrArray *
sort_categories (GPtrArray *categories)
{
    GPtrArray *c;
    int i;

    c = g_ptr_array_new ();
    g_ptr_array_set_size (c, categories->len);

    for (i = 0; i < categories->len; i++)
        c->pdata[i] = g_strdup (categories->pdata[i]);

    qsort (c->pdata, c->len, sizeof (gpointer), compare_categories_cb);

    return c;
}

/**
 * cal_search_bar_set_categories:
 * @cal_search: A calendar search bar.
 * @categories: Array of pointers to strings for the category names.
 * 
 * Sets the list of categories that are to be shown in the drop-down list
 * of a calendar search bar.  The search bar will automatically add an item
 * for "unfiled" components, that is, those that have no categories assigned
 * to them.
 **/
void
cal_search_bar_set_categories (CalSearchBar *cal_search, GPtrArray *categories)
{
    CalSearchBarPrivate *priv;

    g_return_if_fail (cal_search != NULL);
    g_return_if_fail (IS_CAL_SEARCH_BAR (cal_search));
    g_return_if_fail (categories != NULL);

    priv = cal_search->priv;

    g_assert (priv->categories != NULL);
    free_categories (priv->categories);

    priv->categories = sort_categories (categories);
    make_suboptions (cal_search);
}

/**
 * cal_search_bar_get_category:
 * @cal_search: A calendar search bar.
 * 
 * Queries the currently selected category name in a calendar search bar.
 * If "All" or "Unfiled" are selected, this function will return NULL.
 * 
 * Return value: Name of the selected category, or NULL if there is no
 * selected category.
 **/
const char *
cal_search_bar_get_category (CalSearchBar *cal_search)
{
    const char *category;

    category = get_current_category (cal_search);

    if (!category || category == (const char *) 1)
        return NULL;
    else
        return category;
}