path: root/calendar/gui/dialogs/task-page.c

/* Evolution calendar - Main page of the task editor dialog
 *
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Authors: Federico Mena-Quintero <federico@ximian.com>
 *          Miguel de Icaza <miguel@ximian.com>
 *          Seth Alves <alves@hungry.com>
 *          JP Rosevear <jpr@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 <string.h>
#include <gdk/gdkkeysyms.h>
#include <gtk/gtksignal.h>
#include <gtk/gtktextview.h>
#include <gtk/gtktogglebutton.h>
#include <gtk/gtkspinbutton.h>
#include <gtk/gtkoptionmenu.h>
#include <gtk/gtkmessagedialog.h>
#include <libgnome/gnome-i18n.h>
#include <glade/glade.h>
#include <libedataserverui/e-source-option-menu.h>
#include <misc/e-dateedit.h>
#include <e-util/e-dialog-utils.h>
#include "common/authentication.h"
#include "e-util/e-popup.h"
#include "e-util/e-dialog-widgets.h"
#include "e-util/e-categories-config.h"
#include "e-util/e-util-private.h"
#include "../e-timezone-entry.h"
#include "../calendar-config.h"
#include "comp-editor.h"
#include "comp-editor-util.h"
#include "e-send-options-utils.h"
#include "task-page.h"

#include "../e-meeting-attendee.h"
#include "../e-meeting-store.h"
#include "../e-meeting-list-view.h"
#include "../e-cal-popup.h"


/* Private part of the TaskPage structure */
struct _TaskPagePrivate {
    /* Glade XML data */
    GladeXML *xml;

    /* Bonobo Controller for the menu/toolbar */
    BonoboUIComponent *uic;
    
    /* Widgets from the Glade file */
    GtkWidget *main;

    EAccountList *accounts;
    EMeetingAttendee *ia;   
    char *default_address;
    char *user_add;
    ECalComponent *comp;

    /* For meeting/event */
    GtkWidget *calendar_label;
    GtkWidget *org_cal_label;
    GtkWidget *attendee_box;

    /* Lists of attendees */
    GPtrArray *deleted_attendees;
    
    GtkWidget *summary;
    GtkWidget *summary_label;

    GtkWidget *due_date;
    GtkWidget *start_date;
    GtkWidget *timezone;
    GtkWidget *timezone_label;
    
    GtkWidget *description;

    ECalComponentClassification classification;

    GtkWidget *categories_btn;
    GtkWidget *categories;

    GtkWidget *source_selector;
    GtkWidget *sendoptions_frame;
    GtkWidget *sendoptions_button;

    /* Meeting related items */
    GtkWidget *list_box;
    GtkWidget *organizer_table;
    GtkWidget *organizer;
    GtkWidget *add;
    GtkWidget *remove;
    GtkWidget *edit;
    GtkWidget *invite;
    GtkWidget *attendees_label;

    /* ListView stuff */
    EMeetingStore *model;
    ECal      *client;
    EMeetingListView *list_view;
    gint row;

    /* For handling who the organizer is */
    gboolean user_org;
    gboolean existing;
    
    gboolean updating;
    gboolean sendoptions_shown;
    gboolean is_assignment;

    ESendOptionsDialog *sod;
};

static const int classification_map[] = {
    E_CAL_COMPONENT_CLASS_PUBLIC,
    E_CAL_COMPONENT_CLASS_PRIVATE,
    E_CAL_COMPONENT_CLASS_CONFIDENTIAL,
    -1
};



static void task_page_finalize (GObject *object);

static GtkWidget *task_page_get_widget (CompEditorPage *page);
static void task_page_focus_main_widget (CompEditorPage *page);
static gboolean task_page_fill_widgets (CompEditorPage *page, ECalComponent *comp);
static gboolean task_page_fill_component (CompEditorPage *page, ECalComponent *comp);
static gboolean task_page_fill_timezones (CompEditorPage *page, GHashTable *timezones);
static void task_page_set_summary (CompEditorPage *page, const char *summary);
static void task_page_set_dates (CompEditorPage *page, CompEditorPageDates *dates);

G_DEFINE_TYPE (TaskPage, task_page, TYPE_COMP_EDITOR_PAGE);

/* Class initialization function for the task page */
static void
task_page_class_init (TaskPageClass *class)
{
    CompEditorPageClass *editor_page_class;
    GObjectClass *object_class;

    editor_page_class = (CompEditorPageClass *) class;
    object_class = (GObjectClass *) class;

    editor_page_class->get_widget = task_page_get_widget;
    editor_page_class->focus_main_widget = task_page_focus_main_widget;
    editor_page_class->fill_widgets = task_page_fill_widgets;
    editor_page_class->fill_component = task_page_fill_component;
    editor_page_class->fill_timezones = task_page_fill_timezones;
    editor_page_class->set_summary = task_page_set_summary;
    editor_page_class->set_dates = task_page_set_dates;

    object_class->finalize = task_page_finalize;
}

/* Object initialization function for the task page */
static void
task_page_init (TaskPage *tpage)
{
    TaskPagePrivate *priv;

    priv = g_new0 (TaskPagePrivate, 1);
    tpage->priv = priv;

    priv->xml = NULL;
    priv->uic = NULL;

    priv->main = NULL;
    priv->summary = NULL;
    priv->summary_label = NULL;
    priv->due_date = NULL;
    priv->start_date = NULL;
    priv->timezone = NULL;
    priv->description = NULL;
    priv->classification = E_CAL_COMPONENT_CLASS_NONE;
    priv->categories_btn = NULL;
    priv->categories = NULL;
    priv->sendoptions_frame = NULL;
    priv->sendoptions_button = NULL;
    priv->sendoptions_shown = FALSE;
    priv->sod = NULL;

    priv->updating = FALSE;
    priv->sendoptions_shown = FALSE;
    priv->is_assignment = FALSE;
    
    priv->deleted_attendees = g_ptr_array_new ();

    priv->comp = NULL;

    priv->accounts = NULL;
    priv->ia = NULL;
    priv->default_address = NULL;
    priv->invite = NULL;
    
    priv->model = NULL;
    priv->list_view = NULL; 
    priv->default_address = NULL;
}

static void
cleanup_attendees (GPtrArray *attendees)
{
    int i;
    
    for (i = 0; i < attendees->len; i++)
        g_object_unref (g_ptr_array_index (attendees, i));
}

/* Destroy handler for the task page */
static void
task_page_finalize (GObject *object)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;

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

    tpage = TASK_PAGE (object);
    priv = tpage->priv;

    if (priv->main)
        gtk_widget_unref (priv->main);

    if (priv->xml) {
        g_object_unref (priv->xml);
        priv->xml = NULL;
    }
    
    if (priv->sod) {
        g_object_unref (priv->sod);
        priv->sod = NULL;
    }

    if (priv->comp != NULL)
        g_object_unref (priv->comp);
 
    cleanup_attendees (priv->deleted_attendees);
    g_ptr_array_free (priv->deleted_attendees, TRUE);

    g_free (priv);
    tpage->priv = NULL;

    if (G_OBJECT_CLASS (task_page_parent_class)->finalize)
        (* G_OBJECT_CLASS (task_page_parent_class)->finalize) (object);
}

static void
set_classification_menu (TaskPage *page, gint class)
{
    bonobo_ui_component_freeze (page->priv->uic, NULL);
    switch (class) {
        case E_CAL_COMPONENT_CLASS_PUBLIC:
            bonobo_ui_component_set_prop (
                page->priv->uic, "/commands/ActionClassPublic",
                "state", "1", NULL);
            break;
        case E_CAL_COMPONENT_CLASS_CONFIDENTIAL:
            bonobo_ui_component_set_prop (
                page->priv->uic, "/commands/ActionClassConfidential",
                "state", "1", NULL);
            break;
        case E_CAL_COMPONENT_CLASS_PRIVATE:
            bonobo_ui_component_set_prop (
                page->priv->uic, "/commands/ActionClassPrivate",
                "state", "1", NULL);
            break;
    }
    bonobo_ui_component_thaw (page->priv->uic, NULL);
}



/* get_widget handler for the task page */
static GtkWidget *
task_page_get_widget (CompEditorPage *page)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;

    return priv->main;
}

/* focus_main_widget handler for the task page */
static void
task_page_focus_main_widget (CompEditorPage *page)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;

    gtk_widget_grab_focus (priv->summary);
}

/* Fills the widgets with default values */
static void
clear_widgets (TaskPage *tpage)
{
    TaskPagePrivate *priv;

    priv = tpage->priv;

    /* Summary, description */
    e_dialog_editable_set (priv->summary, NULL);
    gtk_text_buffer_set_text (gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description)), "", 0);

    /* Start, due times */
    e_date_edit_set_time (E_DATE_EDIT (priv->start_date), 0);
    e_date_edit_set_time (E_DATE_EDIT (priv->due_date), 0);

    /* Classification */
    priv->classification = E_CAL_COMPONENT_CLASS_PRIVATE;
    set_classification_menu (tpage, priv->classification);

    /* Categories */
    e_dialog_editable_set (priv->categories, NULL);
    
    gtk_entry_set_text (GTK_ENTRY (GTK_COMBO (priv->organizer)->entry), priv->default_address);
    
}

void
task_page_set_view_role (TaskPage *page, gboolean state)
{
    TaskPagePrivate *priv = page->priv;

    e_meeting_list_view_column_set_visible (priv->list_view, "Role", state);
}

void
task_page_set_view_status (TaskPage *page, gboolean state)
{
    TaskPagePrivate *priv = page->priv;

    e_meeting_list_view_column_set_visible (priv->list_view, "Status", state);
}

void
task_page_set_view_type (TaskPage *page, gboolean state)
{
    TaskPagePrivate *priv = page->priv;

    e_meeting_list_view_column_set_visible (priv->list_view, "Type", state);
}

void
task_page_set_view_rsvp (TaskPage *page, gboolean state)
{
    TaskPagePrivate *priv = page->priv;

    e_meeting_list_view_column_set_visible (priv->list_view, "RSVP", state);
}

void 
task_page_set_classification (TaskPage *page, ECalComponentClassification class)
{
    page->priv->classification = class;
}

static void
sensitize_widgets (TaskPage *tpage)
{
    gboolean read_only, sens, sensitize;
    TaskPagePrivate *priv;
    
    priv = tpage->priv;

    if (!e_cal_is_read_only (COMP_EDITOR_PAGE (tpage)->client, &read_only, NULL))
        read_only = TRUE;
    
    if (COMP_EDITOR_PAGE (tpage)->flags & COMP_EDITOR_IS_ASSIGNED)
        sens = COMP_EDITOR_PAGE (tpage)->flags & COMP_EDITOR_PAGE_USER_ORG;

    sensitize = (!read_only && sens);

    gtk_entry_set_editable (GTK_ENTRY (priv->summary), !read_only);
    gtk_widget_set_sensitive (priv->due_date, !read_only);
    gtk_widget_set_sensitive (priv->start_date, !read_only);
    gtk_widget_set_sensitive (priv->timezone, !read_only);
    gtk_widget_set_sensitive (priv->description, !read_only);
    gtk_widget_set_sensitive (priv->categories_btn, !read_only);
    gtk_widget_set_sensitive (priv->sendoptions_button, !read_only);
    gtk_entry_set_editable (GTK_ENTRY (priv->categories), !read_only);

    gtk_widget_set_sensitive (priv->organizer, !read_only);
    gtk_widget_set_sensitive (priv->add, (!read_only &&  sens));
    gtk_widget_set_sensitive (priv->edit, (!read_only && sens));
    e_meeting_list_view_set_editable (priv->list_view, (!read_only && sens));
    gtk_widget_set_sensitive (priv->remove, (!read_only &&  sens));
    gtk_widget_set_sensitive (priv->invite, (!read_only &&  sens));
    gtk_widget_set_sensitive (GTK_WIDGET (priv->list_view), !read_only);    

    bonobo_ui_component_set_prop (priv->uic, "/commands/InsertAttachments", "sensitive", sensitize ? "1" : "0"
            , NULL);
    bonobo_ui_component_set_prop (priv->uic, "/commands/ViewTimeZone", "sensitive", sensitize ? "1" : "0"
            , NULL);
    bonobo_ui_component_set_prop (priv->uic, "/commands/ActionClassPublic", "sensitive", sensitize ? "1" : "0"
            , NULL);
    bonobo_ui_component_set_prop (priv->uic, "/commands/ActionClassPrivate", "sensitive", sensitize ? "1" : "0"
            , NULL);
    bonobo_ui_component_set_prop (priv->uic, "/commands/ActionClassConfidential", "sensitive",
                sensitize ? "1" : "0", NULL);
    bonobo_ui_component_set_prop (priv->uic, "/commands/ViewCategories", "sensitive", sensitize ? "1" : "0"
            , NULL);
    bonobo_ui_component_set_prop (priv->uic, "/commands/InsertSendOptions", "sensitive", sensitize ? "1" : "0"
            , NULL);
    bonobo_ui_component_set_prop (priv->uic, "/commands/OptionStatus", "sensitive", sensitize ? "1" : "0"
            , NULL);

    
    if (!priv->is_assignment) {
        gtk_widget_hide (priv->calendar_label);
        gtk_widget_hide (priv->list_box);
        gtk_widget_hide (priv->attendee_box);
        gtk_widget_hide (priv->organizer);
        gtk_widget_hide (priv->invite);
        gtk_label_set_text_with_mnemonic ((GtkLabel *) priv->org_cal_label, _("_Group"));
    } else {
        gtk_widget_show (priv->invite); 
        gtk_widget_show (priv->calendar_label);
        gtk_widget_show (priv->list_box);
        gtk_widget_show (priv->attendee_box);
        gtk_widget_show (priv->organizer);
        gtk_label_set_text_with_mnemonic ((GtkLabel *) priv->org_cal_label, _("Or_ganizer"));       
    }
}
void
task_page_hide_options (TaskPage *page)
{
    g_return_if_fail (IS_TASK_PAGE (page));


    bonobo_ui_component_set_prop (page->priv->uic, "/commands/InsertSendOptions", "hidden", "1", NULL);
    page->priv->sendoptions_shown = FALSE;
    
}
void
task_page_show_options (TaskPage *page)
{
    g_return_if_fail (IS_TASK_PAGE (page));
    
    bonobo_ui_component_set_prop (page->priv->uic, "/commands/InsertSendOptions", "hidden", "0", NULL);
    page->priv->sendoptions_shown = TRUE;
}

void
task_page_set_assignment (TaskPage *page, gboolean set)
{
    g_return_if_fail (IS_TASK_PAGE (page));

    page->priv->is_assignment = set;
    sensitize_widgets (page);
}

static EAccount *
get_current_account (TaskPage *page)
{   
    TaskPagePrivate *priv;
    EIterator *it;
    const char *str;
    
    priv = page->priv;

    str = gtk_entry_get_text (GTK_ENTRY (GTK_COMBO (priv->organizer)->entry));
    if (!str)
        return NULL;
    
    for (it = e_list_get_iterator((EList *)priv->accounts); e_iterator_is_valid(it); e_iterator_next(it)) {
        EAccount *a = (EAccount *)e_iterator_get(it);
        char *full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);

        if (!strcmp (full, str)) {
            g_free (full);
            g_object_unref (it);

            return a;
        }
    
        g_free (full);
    }
    g_object_unref (it);
    
    return NULL;    
}

/* fill_widgets handler for the task page */
static gboolean
task_page_fill_widgets (CompEditorPage *page, ECalComponent *comp)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    ECalComponentText text;
    ECalComponentDateTime d;
    ECalComponentClassification cl;
    GSList *l;
    icalcomponent *icalcomp;
    const char *categories, *uid;
    icaltimezone *zone, *default_zone;
    ESource *source;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;

    priv->updating = TRUE;

    /* Clean out old data */
    if (priv->comp != NULL)
        g_object_unref (priv->comp);
    priv->comp = NULL;
    
    cleanup_attendees (priv->deleted_attendees);
    g_ptr_array_set_size (priv->deleted_attendees, 0);
    
    /* Component for cancellation */
    priv->comp = e_cal_component_clone (comp);

    /* Clean the screen */
    clear_widgets (tpage);

    priv->user_add = itip_get_comp_attendee (comp, page->client);
    
        /* Summary, description(s) */
    e_cal_component_get_summary (comp, &text);
    e_dialog_editable_set (priv->summary, text.value);

    e_cal_component_get_description_list (comp, &l);
    if (l && l->data) {
        ECalComponentText *dtext;
        
        dtext = l->data;
        gtk_text_buffer_set_text (gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description)),
                      dtext->value ? dtext->value : "", -1);
    } else {
        gtk_text_buffer_set_text (gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description)),
                      "", 0);
    }
    e_cal_component_free_text_list (l);

    default_zone = calendar_config_get_icaltimezone ();

    /* Due Date. */
    e_cal_component_get_due (comp, &d);
    zone = NULL;
    if (d.value) {
        struct icaltimetype *due_tt = d.value;
        e_date_edit_set_date (E_DATE_EDIT (priv->due_date),
                      due_tt->year, due_tt->month,
                      due_tt->day);
        if (due_tt->is_date) {
            e_date_edit_set_time_of_day (E_DATE_EDIT (priv->due_date),
                             -1, -1);
        } else {
            e_date_edit_set_time_of_day (E_DATE_EDIT (priv->due_date),
                             due_tt->hour,
                             due_tt->minute);
        }
    } else {
        e_date_edit_set_time (E_DATE_EDIT (priv->due_date), -1);

        /* If no time is set, we use the default timezone, so the
           user usually doesn't have to set this when they set the
           date. */
        zone = NULL;
    }

    /* Note that if we are creating a new task, the timezones may not be
       on the server, so we try to get the builtin timezone with the TZID
       first. */
    if (!zone && d.tzid) {
        if (!e_cal_get_timezone (page->client, d.tzid, &zone, NULL))
            /* FIXME: Handle error better. */
            g_warning ("Couldn't get timezone from server: %s",
                   d.tzid ? d.tzid : "");
    }
    
    e_timezone_entry_set_timezone (E_TIMEZONE_ENTRY (priv->timezone),
                       zone ? zone : default_zone);
    task_page_set_show_timezone (tpage, calendar_config_get_show_timezone());

    if (!(COMP_EDITOR_PAGE (tpage)->flags & COMP_EDITOR_PAGE_NEW_ITEM) && !zone) {
            task_page_set_show_timezone (tpage, FALSE);
            bonobo_ui_component_set_prop (priv->uic, "/commands/ViewTimeZone", 
                    "state", "0", NULL);
    }

    e_cal_component_free_datetime (&d);

    /* Start Date. */
    e_cal_component_get_dtstart (comp, &d);
    zone = NULL;
    if (d.value) {
        struct icaltimetype *start_tt = d.value;
        e_date_edit_set_date (E_DATE_EDIT (priv->start_date),
                      start_tt->year, start_tt->month,
                      start_tt->day);
        if (start_tt->is_date) {
            e_date_edit_set_time_of_day (E_DATE_EDIT (priv->start_date),
                             -1, -1);
            zone = default_zone;
        } else {
            e_date_edit_set_time_of_day (E_DATE_EDIT (priv->start_date),
                             start_tt->hour,
                             start_tt->minute);
        }
    } else {
        e_date_edit_set_time (E_DATE_EDIT (priv->start_date), -1);

        /* If no time is set, we use the default timezone, so the
           user usually doesn't have to set this when they set the
           date. */
        zone = default_zone;
    }

    e_cal_component_free_datetime (&d);

    /* Classification. */
    e_cal_component_get_classification (comp, &cl);

    switch (cl) {
    case E_CAL_COMPONENT_CLASS_PUBLIC:
    case E_CAL_COMPONENT_CLASS_PRIVATE:
    case E_CAL_COMPONENT_CLASS_CONFIDENTIAL:
        break;
    default:
        /* default to PUBLIC */
        cl = E_CAL_COMPONENT_CLASS_PUBLIC;
                break;
    }
    set_classification_menu (tpage, cl);

    e_cal_component_get_uid (comp, &uid);
    if (e_cal_get_object (COMP_EDITOR_PAGE (tpage)->client, uid, NULL, &icalcomp, NULL)) {
        icalcomponent_free (icalcomp);
        task_page_hide_options (tpage);
    }

    /* Categories */
    e_cal_component_get_categories (comp, &categories);
    e_dialog_editable_set (priv->categories, categories);

    /* Source */
    source = e_cal_get_source (page->client);
    e_source_option_menu_select (E_SOURCE_OPTION_MENU (priv->source_selector), source);

    if (priv->is_assignment) {
        ECalComponentOrganizer organizer;   
        
        priv->user_add = itip_get_comp_attendee (comp, COMP_EDITOR_PAGE (tpage)->client);   

        /* If there is an existing organizer show it properly */
        if (e_cal_component_has_organizer (comp)) {
            e_cal_component_get_organizer (comp, &organizer);
            if (organizer.value != NULL) {
                const gchar *strip = itip_strip_mailto (organizer.value);
                gchar *string;
                if (itip_organizer_is_user (comp, page->client)) {
                    if (e_cal_get_static_capability (
                                page->client,
                                CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS))
                        priv->user_org = TRUE;
                } else {
                    if (e_cal_get_static_capability (
                                page->client,
                                CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS))
                        gtk_widget_set_sensitive (priv->invite, FALSE);
                    gtk_widget_set_sensitive (priv->add, FALSE);
                    gtk_widget_set_sensitive (priv->edit, FALSE);
                    gtk_widget_set_sensitive (priv->remove, FALSE);
                    priv->user_org = FALSE;
                }

                if (e_cal_get_static_capability (COMP_EDITOR_PAGE (tpage)->client, CAL_STATIC_CAPABILITY_NO_ORGANIZER) && (COMP_EDITOR_PAGE (tpage)->flags & COMP_EDITOR_PAGE_DELEGATE))
                    string = g_strdup (priv->user_add);
                else if ( organizer.cn != NULL)
                    string = g_strdup_printf ("%s <%s>", organizer.cn, strip);
                else
                    string = g_strdup (strip);

                g_free (string);
                priv->existing = TRUE;
            }
        } else {
            EAccount *a;

            a = get_current_account (tpage);
            if (a != NULL) {
                CompEditorPage *page = (CompEditorPage *) tpage;
                priv->ia = e_meeting_store_add_attendee_with_defaults (priv->model);
                g_object_ref (priv->ia);

                e_meeting_attendee_set_address (priv->ia, g_strdup_printf ("MAILTO:%s", a->id->address));
                e_meeting_attendee_set_cn (priv->ia, g_strdup (a->id->name));
                if (page->client && e_cal_get_organizer_must_accept (page->client))
                    e_meeting_attendee_set_status (priv->ia, ICAL_PARTSTAT_NEEDSACTION);
                else
                    e_meeting_attendee_set_status (priv->ia, ICAL_PARTSTAT_ACCEPTED);
            }
        }
    }


    priv->updating = FALSE;

    sensitize_widgets (tpage);

    return TRUE;
}

static void
set_attendees (ECalComponent *comp, const GPtrArray *attendees)
{
    GSList *comp_attendees = NULL, *l;
    int i;
    
    for (i = 0; i < attendees->len; i++) {
        EMeetingAttendee *ia = g_ptr_array_index (attendees, i);
        ECalComponentAttendee *ca;
        
        ca = e_meeting_attendee_as_e_cal_component_attendee (ia);
        
        comp_attendees = g_slist_prepend (comp_attendees, ca);
        
    }
    comp_attendees = g_slist_reverse (comp_attendees);
    
    e_cal_component_set_attendee_list (comp, comp_attendees);
    
    for (l = comp_attendees; l != NULL; l = l->next)
        g_free (l->data);   
    g_slist_free (comp_attendees);
}

/* fill_component handler for the task page */
static gboolean
task_page_fill_component (CompEditorPage *page, ECalComponent *comp)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    ECalComponentDateTime date;
    struct icaltimetype start_tt, due_tt;
    char *cat, *str;
    gboolean start_date_set, due_date_set, time_set;
    GtkTextBuffer *text_buffer;
    GtkTextIter text_iter_start, text_iter_end;
    icaltimezone *start_zone = NULL;
    icaltimezone *due_zone = NULL;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;
    text_buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description));

    /* Summary. */

    str = e_dialog_editable_get (priv->summary);
    if (!str || strlen (str) == 0)
        e_cal_component_set_summary (comp, NULL);
    else {
        ECalComponentText text;

        text.value = str;
        text.altrep = NULL;

        e_cal_component_set_summary (comp, &text);
    }

    if (str)
        g_free (str);

    /* Description */

    gtk_text_buffer_get_start_iter (text_buffer, &text_iter_start);
    gtk_text_buffer_get_end_iter   (text_buffer, &text_iter_end);
    str = gtk_text_buffer_get_text (text_buffer, &text_iter_start, &text_iter_end, FALSE);

    if (!str || strlen (str) == 0)
        e_cal_component_set_description_list (comp, NULL);
    else {
        GSList l;
        ECalComponentText text;

        text.value = str;
        text.altrep = NULL;
        l.data = &text;
        l.next = NULL;

        e_cal_component_set_description_list (comp, &l);
    }

    if (str)
        g_free (str);

    /* Dates */

    due_tt = icaltime_null_time ();

    date.value = &due_tt;
    date.tzid = NULL;

    /* Due Date. */
    if (!e_date_edit_date_is_valid (E_DATE_EDIT (priv->due_date)) ||
        !e_date_edit_time_is_valid (E_DATE_EDIT (priv->due_date))) {
        comp_editor_page_display_validation_error (page, _("Due date is wrong"), priv->due_date);
        return FALSE;
    }

    due_date_set = e_date_edit_get_date (E_DATE_EDIT (priv->due_date),
                     &due_tt.year,
                     &due_tt.month,
                     &due_tt.day);
    time_set = e_date_edit_get_time_of_day (E_DATE_EDIT (priv->due_date),
                        &due_tt.hour,
                        &due_tt.minute);
    if (due_date_set) {
        if (time_set) {
            due_zone = e_timezone_entry_get_timezone (E_TIMEZONE_ENTRY (priv->timezone));
            date.tzid = icaltimezone_get_tzid (due_zone);
        } else {
            due_tt.is_date = TRUE;
            date.tzid = NULL;
        }
        e_cal_component_set_due (comp, &date);
    } else {
        e_cal_component_set_due (comp, NULL);
    }

    /* Start Date. */
    if (!e_date_edit_date_is_valid (E_DATE_EDIT (priv->start_date)) ||
        !e_date_edit_time_is_valid (E_DATE_EDIT (priv->start_date))) {
        comp_editor_page_display_validation_error (page, _("Start date is wrong"), priv->start_date);
        return FALSE;
    }

    start_tt = icaltime_null_time ();
    date.value = &start_tt;
    start_date_set = e_date_edit_get_date (E_DATE_EDIT (priv->start_date),
                     &start_tt.year,
                     &start_tt.month,
                     &start_tt.day);
    time_set = e_date_edit_get_time_of_day (E_DATE_EDIT (priv->start_date),
                        &start_tt.hour,
                        &start_tt.minute);
    if (start_date_set) {
        if (time_set) {
            start_zone = e_timezone_entry_get_timezone (E_TIMEZONE_ENTRY (priv->timezone));
            date.tzid = icaltimezone_get_tzid (start_zone);
        } else {
            start_tt.is_date = TRUE;
            date.tzid = NULL;
        }
        e_cal_component_set_dtstart (comp, &date);
    } else {
        e_cal_component_set_dtstart (comp, NULL);
    }
    
    /* Classification. */
    e_cal_component_set_classification (comp, priv->classification);
    
    /* send options */
    if (priv->sendoptions_shown && priv->sod) 
        e_sendoptions_utils_fill_component (priv->sod, comp);

    /* Categories */
    cat = e_dialog_editable_get (priv->categories);
    str = comp_editor_strip_categories (cat);
    if (cat)
        g_free (cat);

    e_cal_component_set_categories (comp, str);

    if (str)
        g_free (str);

    if (priv->is_assignment) {
        ECalComponentOrganizer organizer = {NULL, NULL, NULL, NULL};

        if (!priv->existing) {
            EAccount *a;
            gchar *addr = NULL;

            /* Find the identity for the organizer or sentby field */
            a = get_current_account (tpage);

            /* Sanity Check */
            if (a == NULL) {
                e_notice (page, GTK_MESSAGE_ERROR,
                        _("The organizer selected no longer has an account."));
                return FALSE;           
            }

            if (a->id->address == NULL || strlen (a->id->address) == 0) {
                e_notice (page, GTK_MESSAGE_ERROR,
                        _("An organizer is required."));
                return FALSE;
            } 

            addr = g_strdup_printf ("MAILTO:%s", a->id->address);

            organizer.value = addr;
            organizer.cn = a->id->name;
            e_cal_component_set_organizer (comp, &organizer);

            g_free (addr);
        }

        if (e_meeting_store_count_actual_attendees (priv->model) < 1) {
            e_notice (page, GTK_MESSAGE_ERROR,
                    _("At least one attendee is required."));
            return FALSE;
        }


        if (COMP_EDITOR_PAGE (tpage)->flags & COMP_EDITOR_PAGE_DELEGATE ) {
            GSList *attendee_list, *l;
            int i;
            const GPtrArray *attendees = e_meeting_store_get_attendees (priv->model);

            e_cal_component_get_attendee_list (priv->comp, &attendee_list);

            for (i = 0; i < attendees->len; i++) {
                EMeetingAttendee *ia = g_ptr_array_index (attendees, i);
                ECalComponentAttendee *ca;

                /* Remove the duplicate user from the component if present */
                if (e_meeting_attendee_is_set_delto (ia)) {
                    for (l = attendee_list; l; l = l->next) {
                        ECalComponentAttendee *a = l->data;

                        if (g_str_equal (a->value, e_meeting_attendee_get_address (ia))) {
                            attendee_list = g_slist_remove (attendee_list, l->data);
                            break;
                        }
                    }
                }

                ca = e_meeting_attendee_as_e_cal_component_attendee (ia);

                attendee_list = g_slist_append (attendee_list, ca);
            }
            e_cal_component_set_attendee_list (comp, attendee_list);
            e_cal_component_free_attendee_list (attendee_list);
        } else 
            set_attendees (comp, e_meeting_store_get_attendees (priv->model));
    }

    return TRUE;
}

static void
add_clicked_cb (GtkButton *btn, TaskPage *page)
{
    EMeetingAttendee *attendee;

    attendee = e_meeting_store_add_attendee_with_defaults (page->priv->model);

    if (COMP_EDITOR_PAGE (page)->flags & COMP_EDITOR_PAGE_DELEGATE) {
        e_meeting_attendee_set_delfrom (attendee, g_strdup_printf ("MAILTO:%s", page->priv->user_add));
    }

    e_meeting_list_view_edit (page->priv->list_view, attendee);
}

edit_clicked_cb (GtkButton *btn, TaskPage *tpage)
{
    TaskPagePrivate *priv;
    EMeetingAttendee *attendee;
    GtkTreePath *path = NULL;
    GtkTreeViewColumn *focus_col;
    gint row = 0;

    priv = tpage->priv;

    gtk_tree_view_get_cursor (GTK_TREE_VIEW (priv->list_view), &path, NULL);
    g_return_if_fail (path != NULL);

    gtk_tree_view_get_cursor (GTK_TREE_VIEW (priv->list_view), &path, &focus_col);
    gtk_tree_view_set_cursor (GTK_TREE_VIEW (priv->list_view), path, focus_col, TRUE);
    gtk_tree_path_free (path);
}


static gboolean
existing_attendee (EMeetingAttendee *ia, ECalComponent *comp) 
{
    GSList *attendees, *l;
    const gchar *ia_address;
    
    ia_address = itip_strip_mailto (e_meeting_attendee_get_address (ia));
    if (!ia_address)
        return FALSE;
    
    e_cal_component_get_attendee_list (comp, &attendees);

    for (l = attendees; l; l = l->next) {
        ECalComponentAttendee *attendee = l->data;
        const char *address;
        
        address = itip_strip_mailto (attendee->value);
        if (address && !g_strcasecmp (ia_address, address)) {
            e_cal_component_free_attendee_list (attendees);
            return TRUE;
        }
    }
    
    e_cal_component_free_attendee_list (attendees);
    
    return FALSE;
}

static void
remove_attendee (TaskPage *page, EMeetingAttendee *ia) 
{
    TaskPagePrivate *priv;
    int pos = 0;
    gboolean delegate = (COMP_EDITOR_PAGE (page)->flags & COMP_EDITOR_PAGE_DELEGATE);
    
    priv = page->priv;

    /* If the user deletes the organizer attendee explicitly,
       assume they no longer want the organizer showing up */
    if (ia == priv->ia) {
        g_object_unref (priv->ia);
        priv->ia = NULL;
    }   
        
    /* If this was a delegatee, no longer delegate */
    if (e_meeting_attendee_is_set_delfrom (ia)) {
        EMeetingAttendee *ib;
        
        ib = e_meeting_store_find_attendee (priv->model, e_meeting_attendee_get_delfrom (ia), &pos);
        if (ib != NULL) {
            e_meeting_attendee_set_delto (ib, NULL);
            
            if (!delegate) 
                e_meeting_attendee_set_edit_level (ib,  E_MEETING_ATTENDEE_EDIT_FULL);
        }       
    }
    
    /* Handle deleting all attendees in the delegation chain */ 
    while (ia != NULL) {
        EMeetingAttendee *ib = NULL;

        if (existing_attendee (ia, priv->comp)) {
            g_object_ref (ia);
            g_ptr_array_add (priv->deleted_attendees, ia);
        }
        
        if (e_meeting_attendee_get_delto (ia) != NULL)
            ib = e_meeting_store_find_attendee (priv->model, e_meeting_attendee_get_delto (ia), NULL);
        e_meeting_store_remove_attendee (priv->model, ia);

        ia = ib;
    }
    
    sensitize_widgets (page);
}

static void
remove_clicked_cb (GtkButton *btn, TaskPage *page)
{
    TaskPagePrivate *priv;
    EMeetingAttendee *ia;
    GtkTreeSelection *selection;
    GList *paths = NULL, *tmp;
    GtkTreeIter iter;
    GtkTreePath *path = NULL;
    gboolean valid_iter;
    char *address;
    
    priv = page->priv;

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (priv->list_view));
    if (!(paths = gtk_tree_selection_get_selected_rows (selection, (GtkTreeModel **) &(priv->model)))) {
        g_warning ("Could not get a selection to delete.");
        return;
    }
    paths = g_list_reverse (paths);
    
    for (tmp = paths; tmp; tmp=tmp->next) {
        path = tmp->data;
        
        gtk_tree_model_get_iter (GTK_TREE_MODEL(priv->model), &iter, path);

        gtk_tree_model_get (GTK_TREE_MODEL (priv->model), &iter, E_MEETING_STORE_ADDRESS_COL, &address, -1);
        ia = e_meeting_store_find_attendee (priv->model, address, NULL);
        g_free (address);
        if (!ia) {
            g_warning ("Cannot delete attendee\n");
            continue;
        } else if (e_meeting_attendee_get_edit_level (ia) != E_MEETING_ATTENDEE_EDIT_FULL) {
            g_warning("Not enough rights to delete attendee: %s\n", e_meeting_attendee_get_address(ia));    
            continue;
        }
        
        remove_attendee (page, ia);
    }
    
    /* Select closest item after removal */
    valid_iter = gtk_tree_model_get_iter (GTK_TREE_MODEL (priv->model), &iter, path);
    if (!valid_iter) {
        gtk_tree_path_prev (path);
        valid_iter = gtk_tree_model_get_iter (GTK_TREE_MODEL (priv->model), &iter, path);
    }
    
    if (valid_iter) {
        gtk_tree_selection_unselect_all (selection);
        gtk_tree_selection_select_iter (selection, &iter);
    }
    
    g_list_foreach (paths, (GFunc) gtk_tree_path_free, NULL);
    g_list_free (paths);
}

static void
invite_cb (GtkWidget *widget, gpointer data) 
{
    TaskPage *page;
    TaskPagePrivate *priv;
    
    page = TASK_PAGE (data);
    priv = page->priv;

    e_meeting_list_view_invite_others_dialog (priv->list_view);
}

static void
attendee_added_cb (EMeetingListView *emlv, EMeetingAttendee *ia, gpointer user_data)
{
   TaskPage *page = TASK_PAGE (user_data);  
   TaskPagePrivate *priv;
   gboolean delegate = (COMP_EDITOR_PAGE (page)->flags & COMP_EDITOR_PAGE_DELEGATE);

   priv = page->priv;

   if (delegate) {
       if (existing_attendee (ia, priv->comp))
           e_meeting_store_remove_attendee (priv->model, ia);
       else {
           if (!e_cal_get_static_capability (COMP_EDITOR_PAGE(page)->client, 
                       CAL_STATIC_CAPABILITY_DELEGATE_TO_MANY)) {
               const char *delegator_id = e_meeting_attendee_get_delfrom (ia);
               EMeetingAttendee *delegator;

               delegator = e_meeting_store_find_attendee (priv->model, delegator_id, NULL);
               e_meeting_attendee_set_delto (delegator, 
                       g_strdup (e_meeting_attendee_get_address (ia)));

               gtk_widget_set_sensitive (priv->invite, FALSE);
               gtk_widget_set_sensitive (priv->add, FALSE);
               gtk_widget_set_sensitive (priv->edit, FALSE);
           }
       }
   }

}

/* Callbacks for list view*/
static void
popup_add_cb (EPopup *ep, EPopupItem *pitem, void *data)
{
    TaskPage *page = data;

    add_clicked_cb (NULL, page);
}

static void
popup_delete_cb (EPopup *ep, EPopupItem *pitem, void *data)
{
    TaskPage *page = data;
    TaskPagePrivate *priv;
    
    priv = page->priv;

    remove_clicked_cb (NULL, page);
}

enum {
    ATTENDEE_CAN_DELEGATE = 1<<1,
    ATTENDEE_CAN_DELETE = 1<<2,
    ATTENDEE_CAN_ADD = 1<<3,
    ATTENDEE_LAST = 1<<4,
};

static EPopupItem context_menu_items[] = {
    { E_POPUP_ITEM, "10.delete", N_("_Remove"), popup_delete_cb, NULL, GTK_STOCK_REMOVE, ATTENDEE_CAN_DELETE },
    { E_POPUP_ITEM, "15.add", N_("_Add "), popup_add_cb, NULL, GTK_STOCK_ADD, ATTENDEE_CAN_ADD },   
};

static void
context_popup_free(EPopup *ep, GSList *items, void *data)
{
    g_slist_free(items);
}

static gint
button_press_event (GtkWidget *widget, GdkEventButton *event, TaskPage *page)
{
    TaskPagePrivate *priv;
    GtkMenu *menu;
    EMeetingAttendee *ia;
    GtkTreePath *path;
    GtkTreeIter iter;
    char *address;
    guint32 disable_mask = ~0;
    GSList *menus = NULL;
    ECalPopup *ep;
    int i;

    priv = page->priv;

    /* only process right-clicks */
    if (event->button != 3 || event->type != GDK_BUTTON_PRESS)
        return FALSE;

    /* only if we right-click on an attendee */
    if (gtk_tree_view_get_path_at_pos (GTK_TREE_VIEW (priv->list_view), event->x, event->y, &path, NULL, NULL, NULL)) {
        GtkTreeSelection *selection;

        if (gtk_tree_model_get_iter (GTK_TREE_MODEL (priv->model), &iter, path)) {
        
            gtk_tree_model_get (GTK_TREE_MODEL (priv->model), &iter, E_MEETING_STORE_ADDRESS_COL, &address, -1);
            ia = e_meeting_store_find_attendee (priv->model, address, &priv->row);
            g_free (address);

            if (ia) {
                selection = gtk_tree_view_get_selection ((GtkTreeView *) priv->list_view);
                gtk_tree_selection_unselect_all (selection);
                gtk_tree_selection_select_path (selection, path);
        
                if (e_meeting_attendee_get_edit_level (ia) == E_MEETING_ATTENDEE_EDIT_FULL)
                    disable_mask &= ~ATTENDEE_CAN_DELETE;
            }
        }
    }

    if (GTK_WIDGET_IS_SENSITIVE(priv->add))
        disable_mask &= ~ATTENDEE_CAN_ADD;
    else if (COMP_EDITOR_PAGE (page)->flags & COMP_EDITOR_PAGE_USER_ORG)
        disable_mask &= ~ATTENDEE_CAN_ADD;

    ep = e_cal_popup_new("org.gnome.evolution.calendar.task.popup");

    for (i=0;i<sizeof(context_menu_items)/sizeof(context_menu_items[0]);i++)
        menus = g_slist_prepend(menus, &context_menu_items[i]);
    
    e_popup_add_items((EPopup *)ep, menus, NULL, context_popup_free, page);
    menu = e_popup_create_menu_once((EPopup *)ep, NULL, disable_mask);
    gtk_menu_popup (menu, NULL, NULL, NULL, NULL, event->button, event->time);

    return TRUE;
}

static gboolean
list_view_event (EMeetingListView *list_view, GdkEvent *event, TaskPage *page) {
    
    TaskPagePrivate *priv= page->priv;
    
    if (event->type == GDK_2BUTTON_PRESS && COMP_EDITOR_PAGE (page)->flags & COMP_EDITOR_PAGE_USER_ORG) {
        EMeetingAttendee *attendee;

        attendee = e_meeting_store_add_attendee_with_defaults (priv->model);

        if (COMP_EDITOR_PAGE (page)->flags & COMP_EDITOR_PAGE_DELEGATE) {
            e_meeting_attendee_set_delfrom (attendee, g_strdup_printf ("MAILTO:%s", page->priv->user_add));
        }

        e_meeting_list_view_edit (page->priv->list_view, attendee);
        return TRUE;
    }

    return FALSE;   
}


static gboolean
list_key_press (EMeetingListView *list_view, GdkEventKey *event, TaskPage *page)
{
    if (event->keyval == GDK_Delete) {
        TaskPagePrivate *priv;
    
        priv = page->priv;
        remove_clicked_cb (NULL, page);

        return TRUE;
    } else if (event->keyval == GDK_Insert) {
        add_clicked_cb (NULL, page);

        return TRUE;
    }

    return FALSE;
}

void 
task_page_set_show_timezone (TaskPage *page, gboolean state)
{
    if (state) {
        gtk_widget_show_all (page->priv->timezone);
        gtk_widget_show (page->priv->timezone_label);   
    } else {
        gtk_widget_hide (page->priv->timezone);
        gtk_widget_hide (page->priv->timezone_label);
    }
        
}

void
task_page_set_show_categories (TaskPage *page, gboolean state)
{
    if (state) {
        gtk_widget_show (page->priv->categories_btn);
        gtk_widget_show (page->priv->categories);   
    } else {
        gtk_widget_hide (page->priv->categories_btn);
        gtk_widget_hide (page->priv->categories);
    }
}

/* fill_timezones handler for the event page */
static gboolean
task_page_fill_timezones (CompEditorPage *page, GHashTable *timezones)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    icaltimezone *zone;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;

    /* add start date timezone */
    zone = e_timezone_entry_get_timezone (E_TIMEZONE_ENTRY (priv->timezone));
    if (zone) {
        if (!g_hash_table_lookup (timezones, icaltimezone_get_tzid (zone)))
            g_hash_table_insert (timezones, icaltimezone_get_tzid (zone), zone);
    }

    return TRUE;
}

/* set_summary handler for the task page */
static void
task_page_set_summary (CompEditorPage *page, const char *summary)
{
    /* nothing */
}

static void
task_page_set_dates (CompEditorPage *page, CompEditorPageDates *dates)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;

    if (priv->updating)
            return;

    priv->updating = TRUE;

    priv->updating = FALSE;
}



/* Gets the widgets from the XML file and returns if they are all available. */
static gboolean
get_widgets (TaskPage *tpage)
{
    CompEditorPage *page = COMP_EDITOR_PAGE (tpage);
    TaskPagePrivate *priv;
    GSList *accel_groups;
    GtkWidget *toplevel;
    GtkWidget *sw;
    GtkTreeSelection *selection;

    priv = tpage->priv;

#define GW(name) glade_xml_get_widget (priv->xml, name)

    priv->main = GW ("task-page");
    if (!priv->main)
        return FALSE;

    /* Get the GtkAccelGroup from the toplevel window, so we can install
       it when the notebook page is mapped. */
    toplevel = gtk_widget_get_toplevel (priv->main);
    accel_groups = gtk_accel_groups_from_object (G_OBJECT (toplevel));
    if (accel_groups) {
        page->accel_group = accel_groups->data;
        gtk_accel_group_ref (page->accel_group);
    }

    gtk_widget_ref (priv->main);
    gtk_container_remove (GTK_CONTAINER (priv->main->parent), priv->main);

    priv->summary = GW ("summary");
    priv->summary_label = GW ("summary-label");

    /* Glade's visibility flag doesn't seem to work for custom widgets */
    priv->due_date = GW ("due-date");
    gtk_widget_show (priv->due_date);
    priv->start_date = GW ("start-date");
    gtk_widget_show (priv->start_date);

    priv->timezone = GW ("timezone");
    priv->timezone_label = GW ("timezone-label");
    priv->attendees_label = GW ("attendees-label");
    priv->description = GW ("description");
    priv->categories_btn = GW ("categories-button");
    priv->categories = GW ("categories");
    priv->organizer = GW ("organizer");
    priv->invite = GW ("invite");
    priv->add = GW ("add-attendee");
    priv->edit = GW ("edit-attendee");
    priv->remove = GW ("remove-attendee");
    priv->list_box = GW ("list-box");
    priv->calendar_label = GW ("group-label");
    priv->attendee_box = GW ("attendee-box");
    priv->org_cal_label = GW ("org-task-label");

    priv->list_view = e_meeting_list_view_new (priv->model);
    
    selection = gtk_tree_view_get_selection ((GtkTreeView *) priv->list_view);
    gtk_tree_selection_set_mode (selection, GTK_SELECTION_MULTIPLE);
    gtk_widget_show (GTK_WIDGET (priv->list_view));

    sw = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (sw), GTK_SHADOW_IN);
    gtk_widget_show (sw);
    gtk_container_add (GTK_CONTAINER (sw), GTK_WIDGET (priv->list_view));
    gtk_box_pack_start (GTK_BOX (priv->list_box), sw, TRUE, TRUE, 0);

    priv->source_selector = GW ("source");
    
#undef GW

    return (priv->summary
        && priv->summary_label
        && priv->due_date
        && priv->start_date
        && priv->timezone
        && priv->description
        && priv->categories_btn
        && priv->categories
        );
}

/* Callback used when the summary changes; we emit the notification signal. */
static void
summary_changed_cb (GtkEditable *editable, gpointer data)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    gchar *summary;
    
    tpage = TASK_PAGE (data);
    priv = tpage->priv;
    
    if (priv->updating)
        return;
    
    summary = e_dialog_editable_get (GTK_WIDGET (editable));
    comp_editor_page_notify_summary_changed (COMP_EDITOR_PAGE (tpage), 
                         summary);
    g_free (summary);
}

/* Callback used when the start or due date widgets change.  We notify the
 * other pages in the task editor, so they can update any labels. 
 */
static void
date_changed_cb (EDateEdit *dedit, gpointer data)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    CompEditorPageDates dates;
    gboolean date_set, time_set;
    ECalComponentDateTime start_dt, due_dt;
    struct icaltimetype start_tt = icaltime_null_time();
    struct icaltimetype due_tt = icaltime_null_time();

    tpage = TASK_PAGE (data);
    priv = tpage->priv;

    if (priv->updating)
        return;

    date_set = e_date_edit_get_date (E_DATE_EDIT (priv->start_date),
                     &start_tt.year,
                     &start_tt.month,
                     &start_tt.day);
    time_set = e_date_edit_get_time_of_day (E_DATE_EDIT (priv->start_date),
                        &start_tt.hour,
                        &start_tt.minute);
    if (date_set) {
        if (time_set) {
            icaltimezone *zone = e_timezone_entry_get_timezone (E_TIMEZONE_ENTRY (priv->timezone));
            start_dt.tzid = icaltimezone_get_tzid (zone);
        } else {
            start_tt.is_date = TRUE;
            start_dt.tzid = NULL;
        }
    } else {
        start_tt = icaltime_null_time ();
        start_dt.tzid = NULL;
    }

    date_set = e_date_edit_get_date (E_DATE_EDIT (priv->due_date),
                     &due_tt.year,
                     &due_tt.month,
                     &due_tt.day);
    time_set = e_date_edit_get_time_of_day (E_DATE_EDIT (priv->due_date),
                        &due_tt.hour,
                        &due_tt.minute);
    if (date_set) {
        if (time_set) {
            icaltimezone *zone = e_timezone_entry_get_timezone (E_TIMEZONE_ENTRY (priv->timezone));
            due_dt.tzid = icaltimezone_get_tzid (zone);
        } else {
            due_tt.is_date = TRUE;
            due_dt.tzid = NULL;
        }
    } else {
        due_tt = icaltime_null_time ();
        due_dt.tzid = NULL;
    }

    start_dt.value = &start_tt;
    dates.start = &start_dt;
    dates.end = NULL;
    due_dt.value = &due_tt;
    dates.due = &due_dt;
    dates.complete = NULL;
    
    /* Notify upstream */
    comp_editor_page_notify_dates_changed (COMP_EDITOR_PAGE (tpage),
                           &dates);
}

static void
timezone_changed_cb (EDateEdit *dedit, gpointer data)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    
    tpage = TASK_PAGE (data);
    priv = tpage->priv;

    date_changed_cb ((EDateEdit *) priv->start_date, tpage);
    date_changed_cb ((EDateEdit *) priv->due_date, tpage);
}

/* Callback used when the categories button is clicked; we must bring up the
 * category list dialog.
 */
static void
categories_clicked_cb (GtkWidget *button, gpointer data)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    GtkWidget *entry;

    tpage = TASK_PAGE (data);
    priv = tpage->priv;

    entry = priv->categories;
    e_categories_config_open_dialog_for_entry (GTK_ENTRY (entry));
}
/* sets the current focused widget */
static gboolean 
widget_focus_in_cb (GtkWidget *widget,  GdkEventFocus *event, gpointer data)
{
    TaskPage *tpage;
    tpage = TASK_PAGE  (data);

    comp_editor_page_set_focused_widget (COMP_EDITOR_PAGE(tpage), widget);

    return FALSE;
}
/* unsets the current focused widget */
static gboolean
widget_focus_out_cb (GtkWidget *widget, GdkEventFocus *event, gpointer data)
{
    TaskPage *tpage;
    tpage = TASK_PAGE (data);

    comp_editor_page_unset_focused_widget (COMP_EDITOR_PAGE(tpage), widget);

    return FALSE;
}
/* This is called when any field is changed; it notifies upstream. */
static void
field_changed_cb (GtkWidget *widget, gpointer data)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    
    tpage = TASK_PAGE (data);
    priv = tpage->priv;
    
    if (!priv->updating)
        comp_editor_page_notify_changed (COMP_EDITOR_PAGE (tpage));
}

static void
source_changed_cb (GtkWidget *widget, ESource *source, gpointer data)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;

    tpage = TASK_PAGE (data);
    priv = tpage->priv;

    if (!priv->updating) {
        ECal *client;

        client = auth_new_cal_from_source (source, E_CAL_SOURCE_TYPE_TODO);
        if (client) {
            icaltimezone *zone;
            
            zone = calendar_config_get_icaltimezone ();
            e_cal_set_default_timezone (client, zone, NULL);
        }
        
        if (!client || !e_cal_open (client, FALSE, NULL)) {
            GtkWidget *dialog;

            if (client)
                g_object_unref (client);

            e_source_option_menu_select (E_SOURCE_OPTION_MENU (priv->source_selector),
                             e_cal_get_source (COMP_EDITOR_PAGE (tpage)->client));

            dialog = gtk_message_dialog_new (NULL, GTK_DIALOG_MODAL,
                             GTK_MESSAGE_WARNING, GTK_BUTTONS_OK,
                             _("Unable to open tasks in '%s'."),
                             e_source_peek_name (source));
            gtk_dialog_run (GTK_DIALOG (dialog));
            gtk_widget_destroy (dialog);
        } else {
            comp_editor_notify_client_changed (
                COMP_EDITOR (gtk_widget_get_toplevel (priv->main)),
                client);
            if (e_cal_get_static_capability (client, CAL_STATIC_CAPABILITY_REQ_SEND_OPTIONS) && priv->is_assignment)
                task_page_show_options (tpage);
            else
                task_page_hide_options (tpage);


            sensitize_widgets (tpage);
        }
    }
}

void
task_page_sendoptions_clicked_cb (TaskPage *tpage)
{
    TaskPagePrivate *priv;
    GtkWidget *toplevel;
    ESource *source;

    priv = tpage->priv;
    
    if (!priv->sod) {
        priv->sod = e_sendoptions_dialog_new ();
        priv->sod->data->initialized = TRUE;
        source = e_source_option_menu_peek_selected  (E_SOURCE_OPTION_MENU (priv->source_selector));
        e_sendoptions_utils_set_default_data (priv->sod, source, "task");
    }
    
    if (e_cal_get_static_capability (COMP_EDITOR_PAGE (tpage)->client, 
                     CAL_STATIC_CAPABILITY_NO_GEN_OPTIONS)) {
        e_sendoptions_set_need_general_options (priv->sod, FALSE);
    }
    
    toplevel = gtk_widget_get_toplevel (priv->main);
    e_sendoptions_dialog_run (priv->sod, toplevel, E_ITEM_TASK);
}

/* Hooks the widget signals */
static gboolean
init_widgets (TaskPage *tpage)
{
    TaskPagePrivate *priv;
    GtkTextBuffer *text_buffer;
    icaltimezone *zone;

    priv = tpage->priv;

    /* Make sure the EDateEdit widgets use our timezones to get the
       current time. */
    e_date_edit_set_get_time_callback (E_DATE_EDIT (priv->start_date),
                       (EDateEditGetTimeCallback) comp_editor_get_current_time,
                       tpage, NULL);
    e_date_edit_set_get_time_callback (E_DATE_EDIT (priv->due_date),
                       (EDateEditGetTimeCallback) comp_editor_get_current_time,
                       tpage, NULL);
    
    /* Summary */
    g_signal_connect((priv->summary), "changed",
                G_CALLBACK (summary_changed_cb), tpage);

    /* Description */
    text_buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description));

    gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (priv->description), GTK_WRAP_WORD);

    /* Dates */
    g_signal_connect((priv->start_date), "changed",
                G_CALLBACK (date_changed_cb), tpage);
    g_signal_connect((priv->due_date), "changed",
                G_CALLBACK (date_changed_cb), tpage);

    /* time zone changed */
    g_signal_connect (priv->timezone, "changed", G_CALLBACK(timezone_changed_cb), tpage);

    /* Categories button */
    g_signal_connect((priv->categories_btn), "clicked",
                G_CALLBACK (categories_clicked_cb), tpage);
    
    /* Source selector */
    g_signal_connect((priv->source_selector), "source_selected",
             G_CALLBACK (source_changed_cb), tpage);

    /* Connect the default signal handler to use to make sure the "changed"
       field gets set whenever a field is changed. */

    /* Set the current focus entry */
    g_signal_connect (priv->summary, "focus-in-event",
              G_CALLBACK (widget_focus_in_cb), tpage);
    g_signal_connect (priv->summary, "focus-out-event",
              G_CALLBACK (widget_focus_out_cb), tpage);

    g_signal_connect (priv->description, "focus-in-event",
              G_CALLBACK (widget_focus_in_cb), tpage);
    g_signal_connect (priv->description, "focus-out-event",
              G_CALLBACK (widget_focus_out_cb), tpage);


    /* Belongs to priv->description */
    g_signal_connect ((text_buffer), "changed",
              G_CALLBACK (field_changed_cb), tpage);

    g_signal_connect((priv->summary), "changed",
                G_CALLBACK (field_changed_cb), tpage);
    g_signal_connect (priv->start_date, "changed",
              G_CALLBACK (field_changed_cb), tpage);
    g_signal_connect (priv->due_date, "changed",
              G_CALLBACK (field_changed_cb), tpage);
    g_signal_connect((priv->timezone), "changed",
                G_CALLBACK (field_changed_cb), tpage);
    g_signal_connect((priv->categories), "changed",
                G_CALLBACK (field_changed_cb), tpage);
    g_signal_connect (G_OBJECT (priv->list_view), "button_press_event", G_CALLBACK (button_press_event), tpage);
    g_signal_connect (G_OBJECT (priv->list_view), "event", G_CALLBACK (list_view_event), tpage);
    g_signal_connect (priv->list_view, "key_press_event", G_CALLBACK (list_key_press), tpage);  
    
    /* Add attendee button */
    g_signal_connect (priv->add, "clicked", G_CALLBACK (add_clicked_cb), tpage);

    /* Edit attendee button */
    g_signal_connect (priv->edit, "clicked", G_CALLBACK (edit_clicked_cb), tpage);

    /* Remove attendee button */
    g_signal_connect (priv->remove, "clicked", G_CALLBACK (remove_clicked_cb), tpage);

    /* Contacts button */
    g_signal_connect(priv->invite, "clicked", G_CALLBACK (invite_cb), tpage);   

    /* Meeting List View */
    g_signal_connect (priv->list_view, "attendee_added", G_CALLBACK (attendee_added_cb), tpage);    
    
    /* Set the default timezone, so the timezone entry may be hidden. */
    zone = calendar_config_get_icaltimezone ();
    e_timezone_entry_set_default_timezone (E_TIMEZONE_ENTRY (priv->timezone), zone);
    
    task_page_set_show_timezone (tpage, calendar_config_get_show_timezone());

    e_meeting_list_view_column_set_visible (priv->list_view, "Attendee                          ", 
            TRUE);
    e_meeting_list_view_column_set_visible (priv->list_view, "Role", calendar_config_get_show_role());
    e_meeting_list_view_column_set_visible (priv->list_view, "RSVP", calendar_config_get_show_rsvp());
    e_meeting_list_view_column_set_visible (priv->list_view, "Status", calendar_config_get_show_status());
    e_meeting_list_view_column_set_visible (priv->list_view, "Type", calendar_config_get_show_type());
    
    task_page_set_show_categories (tpage, calendar_config_get_show_categories());

    return TRUE;
}



/**
 * task_page_construct:
 * @tpage: An task page.
 * 
 * Constructs an task page by loading its Glade data.
 * 
 * Return value: The same object as @tpage, or NULL if the widgets could not be
 * created.
 **/
TaskPage *
task_page_construct (TaskPage *tpage, EMeetingStore *model, ECal *client)
{
    TaskPagePrivate *priv;
    char *backend_address = NULL;
    EIterator *it;
    EAccount *def_account;
    GList *address_strings = NULL, *l;
    EAccount *a;
    char *gladefile;
    
    priv = tpage->priv;
    g_object_ref (model);
    priv->model = model;
    priv->client = client;

    gladefile = g_build_filename (EVOLUTION_GLADEDIR,
                      "task-page.glade",
                      NULL);
    priv->xml = glade_xml_new (gladefile, NULL, NULL);
    g_free (gladefile);

    if (!priv->xml) {
        g_message ("task_page_construct(): "
               "Could not load the Glade XML file!");
        return NULL;
    }

    if (!get_widgets (tpage)) {
        g_message ("task_page_construct(): "
               "Could not find all widgets in the XML file!");
        return NULL;
    }
    /* Address information */
    if (!e_cal_get_cal_address (client, &backend_address, NULL))
        return NULL;

    priv->accounts = itip_addresses_get ();
    def_account = itip_addresses_get_default();
    for (it = e_list_get_iterator((EList *)priv->accounts);
         e_iterator_is_valid(it);
         e_iterator_next(it)) {
        a = (EAccount *)e_iterator_get(it);
        char *full;
        
        full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);

        address_strings = g_list_append(address_strings, full);

        /* Note that the address specified by the backend gets
         * precedence over the default mail address.
         */
        if (backend_address && !strcmp (backend_address, a->id->address)) {
            if (priv->default_address)
                g_free (priv->default_address);
            
            priv->default_address = g_strdup (full);
        } else if (a == def_account && !priv->default_address) {
            priv->default_address = g_strdup (full);
        }
    }
    
    if (backend_address)
        g_free (backend_address);

    g_object_unref(it);

    if (address_strings)
        gtk_combo_set_popdown_strings (GTK_COMBO (priv->organizer), address_strings);
    else
        g_warning ("No potential organizers!");

    for (l = address_strings; l != NULL; l = l->next)
        g_free (l->data);
    g_list_free (address_strings);
    

    if (!init_widgets (tpage)) {
        g_message ("task_page_construct(): " 
               "Could not initialize the widgets!");
        return NULL;
    }

    return tpage;
}

/**
 * task_page_new:
 * 
 * Creates a new task page.
 * 
 * Return value: A newly-created task page, or NULL if the page could
 * not be created.
 **/
TaskPage *
task_page_new (EMeetingStore *model, ECal *client, BonoboUIComponent *uic)
{
    TaskPage *tpage;

    tpage = gtk_type_new (TYPE_TASK_PAGE);
    if (!task_page_construct (tpage, model, client)) {
        g_object_unref (tpage);
        return NULL;
    }
    
    tpage->priv->uic = uic;

    return tpage;
}

ECalComponent *
task_page_get_cancel_comp (TaskPage *page)
{
    TaskPagePrivate *priv;

    g_return_val_if_fail (page != NULL, NULL);
    g_return_val_if_fail (IS_TASK_PAGE (page), NULL);

    priv = page->priv;

    if (priv->deleted_attendees->len == 0)
        return NULL;
    
    set_attendees (priv->comp, priv->deleted_attendees);
    
    return e_cal_component_clone (priv->comp);
}

GtkWidget *task_page_create_date_edit (void);

GtkWidget *
task_page_create_date_edit (void)
{
    GtkWidget *dedit;

    dedit = comp_editor_new_date_edit (TRUE, TRUE, TRUE);
    e_date_edit_set_allow_no_date_set (E_DATE_EDIT (dedit), TRUE);

    return dedit;
}

GtkWidget *task_page_create_source_option_menu (void);

GtkWidget *
task_page_create_source_option_menu (void)
{
    GtkWidget   *menu;
    GConfClient *gconf_client;
    ESourceList *source_list;

    gconf_client = gconf_client_get_default ();
    source_list = e_source_list_new_for_gconf (gconf_client, "/apps/evolution/tasks/sources");

    menu = e_source_option_menu_new (source_list);
    g_object_unref (source_list);

    gtk_widget_show (menu);
    return menu;
}