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

/*
 * Evolution calendar - Main page of the task editor dialog
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Federico Mena-Quintero <federico@ximian.com>
 *      Miguel de Icaza <miguel@ximian.com>
 *      Seth Alves <alves@hungry.com>
 *      JP Rosevear <jpr@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <string.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <gdk/gdkkeysyms.h>
#include <libedataserverui/e-category-completion.h>
#include <libedataserverui/e-source-combo-box.h>
#include <misc/e-dateedit.h>
#include "misc/e-buffer-tagger.h"
#include <e-util/e-dialog-utils.h>
#include "common/authentication.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-util/e-util.h"
#include "e-util/e-dialog-widgets.h"
#include "e-util/e-categories-config.h"
#include "e-util/e-util-private.h"

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

#define TASK_PAGE_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), TYPE_TASK_PAGE, TaskPagePrivate))

/* Private part of the TaskPage structure */
struct _TaskPagePrivate {
    GtkBuilder *builder;

    /* Widgets from the UI file */
    GtkWidget *main;

    EAccountList *accounts;
    GList *address_strings;
    EMeetingAttendee *ia;
    gchar *user_add;
    ECalComponent *comp;

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

    /* Lists of attendees */
    GPtrArray *deleted_attendees;

    /* Generic informative messages placeholder */
    GtkWidget *info_hbox;
    GtkWidget *info_icon;
    GtkWidget *info_string;
    gchar *subscriber_info_text;

    GtkWidget *summary;
    GtkWidget *summary_label;

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

    GtkWidget *description;

    GtkWidget *categories_btn;
    GtkWidget *categories;

    GtkWidget *source_selector;

    /* 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 sendoptions_shown;
    gboolean is_assignment;

    ESendOptionsDialog *sod;
};

static const gint 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_select_organizer (TaskPage *tpage, const gchar *backend_address);
static void set_subscriber_info_string (TaskPage *tpage, const gchar *backend_address);

G_DEFINE_TYPE (TaskPage, task_page, TYPE_COMP_EDITOR_PAGE)

static void
task_page_dispose (GObject *object)
{
    TaskPagePrivate *priv;

    priv = TASK_PAGE_GET_PRIVATE (object);

    if (priv->main != NULL) {
        g_object_unref (priv->main);
        priv->main = NULL;
    }

    if (priv->builder != NULL) {
        g_object_unref (priv->builder);
        priv->builder = NULL;
    }

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

    if (priv->comp != NULL) {
        g_object_unref (priv->comp);
        priv->comp = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (task_page_parent_class)->dispose (object);
}

static void
task_page_finalize (GObject *object)
{
    TaskPagePrivate *priv;

    priv = TASK_PAGE_GET_PRIVATE (object);

    g_list_foreach (priv->address_strings, (GFunc) g_free, NULL);
    g_list_free (priv->address_strings);

    g_ptr_array_foreach (
        priv->deleted_attendees, (GFunc) g_object_unref, NULL);
    g_ptr_array_free (priv->deleted_attendees, TRUE);

    g_free (priv->subscriber_info_text);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (task_page_parent_class)->finalize (object);
}

static void
task_page_class_init (TaskPageClass *class)
{
    GObjectClass *object_class;
    CompEditorPageClass *editor_page_class;

    g_type_class_add_private (class, sizeof (TaskPagePrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->dispose = task_page_dispose;
    object_class->finalize = task_page_finalize;

    editor_page_class = COMP_EDITOR_PAGE_CLASS (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;
}

static void
task_page_init (TaskPage *tpage)
{
    tpage->priv = TASK_PAGE_GET_PRIVATE (tpage);
    tpage->priv->deleted_attendees = g_ptr_array_new ();
}

/* 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 = tpage->priv;
    CompEditor *editor;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));

    /* 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);
    e_buffer_tagger_update_tags (GTK_TEXT_VIEW (priv->description));

    /* 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 */
    comp_editor_set_classification (editor, E_CAL_COMPONENT_CLASS_PUBLIC);

    /* Categories */
    e_dialog_editable_set (priv->categories, NULL);
}

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

    e_meeting_list_view_column_set_visible (priv->list_view, E_MEETING_STORE_ROLE_COL, 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, E_MEETING_STORE_STATUS_COL, 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, E_MEETING_STORE_TYPE_COL, 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, E_MEETING_STORE_RSVP_COL, state);
}

static void
sensitize_widgets (TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->priv;
    CompEditor *editor;
    CompEditorFlags flags;
    ECal *client;
    GtkActionGroup *action_group;
    GtkAction *action;
    gboolean read_only, sens = TRUE, sensitize;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    if (!e_cal_is_read_only (client, &read_only, NULL))
        read_only = TRUE;

    if (flags & COMP_EDITOR_IS_ASSIGNED)
        sens = flags & COMP_EDITOR_USER_ORG;

    sensitize = (!read_only && sens);

    if (read_only) {
        gchar *tmp = g_strconcat ("<b>", _("Task cannot be edited, because the selected task list is read only"), "</b>", NULL);
        task_page_set_info_string (tpage, GTK_STOCK_DIALOG_INFO, tmp);
        g_free (tmp);
    } else if (!sens) {
        gchar *tmp = g_strconcat ("<b>", _("Task cannot be fully edited, because you are not the organizer"), "</b>", NULL);
        task_page_set_info_string (tpage, GTK_STOCK_DIALOG_INFO, tmp);
        g_free (tmp);
    } else {
        task_page_set_info_string (tpage, priv->subscriber_info_text ? GTK_STOCK_DIALOG_INFO : NULL, priv->subscriber_info_text);
    }

    /* The list of organizers is set to be non-editable. Otherwise any
     * change in the displayed list causes an 'Account not found' error.
     */
    gtk_editable_set_editable (GTK_EDITABLE (gtk_bin_get_child (GTK_BIN (priv->organizer))), FALSE);

    gtk_editable_set_editable (GTK_EDITABLE (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_editable_set_editable (GTK_EDITABLE (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);

    action_group = comp_editor_get_action_group (editor, "individual");
    gtk_action_group_set_sensitive (action_group, sensitize);

    action = comp_editor_get_action (editor, "send-options");
    gtk_action_set_sensitive (action, sensitize);

    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 (GTK_LABEL (priv->org_cal_label), _("_Group:"));
        gtk_label_set_mnemonic_widget (GTK_LABEL (priv->org_cal_label), priv->source_selector);
    } 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 (GTK_LABEL (priv->org_cal_label), _("Organi_zer:"));
        gtk_label_set_mnemonic_widget (GTK_LABEL (priv->org_cal_label), priv->organizer);
    }
}
void
task_page_hide_options (TaskPage *page)
{
    CompEditor *editor;
    GtkAction *action;

    g_return_if_fail (IS_TASK_PAGE (page));

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    action = comp_editor_get_action (editor, "send-options");
    gtk_action_set_visible (action, FALSE);
}

void
task_page_show_options (TaskPage *page)
{
    CompEditor *editor;
    GtkAction *action;

    g_return_if_fail (IS_TASK_PAGE (page));

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    action = comp_editor_get_action (editor, "send-options");
    gtk_action_set_visible (action, 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 gchar *str;

    priv = page->priv;

    str = gtk_entry_get_text (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->organizer))));
    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);
        gchar *full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);

        if (!g_ascii_strcasecmp (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;
    CompEditor *editor;
    CompEditorFlags flags;
    GtkAction *action;
    ECal *client;
    GSList *l;
    icalcomponent *icalcomp;
    const gchar *categories, *uid;
    icaltimezone *zone, *default_zone;
    gchar *backend_addr = NULL;
    gboolean active;

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

    editor = comp_editor_page_get_editor (page);
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    /* Clean out old data */
    if (priv->comp != NULL)
        g_object_unref (priv->comp);
    priv->comp = NULL;

    g_ptr_array_foreach (
        priv->deleted_attendees, (GFunc) g_object_unref, NULL);
    g_ptr_array_set_size (priv->deleted_attendees, 0);

    /* Component for cancellation */
    priv->comp = e_cal_component_clone (comp);
    comp_editor_copy_new_attendees (priv->comp, comp);

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

    priv->user_add = itip_get_comp_attendee (comp, 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);
    e_buffer_tagger_update_tags (GTK_TEXT_VIEW (priv->description));

    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 (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);

    action = comp_editor_get_action (editor, "view-time-zone");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    task_page_set_show_timezone (tpage, active);

    if (!(flags & COMP_EDITOR_NEW_ITEM) && !zone) {
        GtkAction *action;

        task_page_set_show_timezone (tpage, FALSE);
        action = comp_editor_get_action (editor, "view-time-zone");
        gtk_toggle_action_set_active (GTK_TOGGLE_ACTION (action), FALSE);
    }

    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);
    comp_editor_set_classification (editor, cl);

    e_cal_component_get_uid (comp, &uid);
    if (e_cal_get_object (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 */
    e_source_combo_box_set_active (
        E_SOURCE_COMBO_BOX (priv->source_selector),
        e_cal_get_source (client));

    e_cal_get_cal_address (client, &backend_addr, NULL);
    set_subscriber_info_string (tpage, backend_addr);

    if (priv->is_assignment) {
        ECalComponentOrganizer organizer;

        priv->user_add = itip_get_comp_attendee (comp, client);

        /* Organizer strings */
        task_page_select_organizer (tpage, backend_addr);

        /* 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, client) || itip_sentby_is_user (comp, client)) {
                    if (e_cal_get_static_capability (
                                client,
                                CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS))
                        priv->user_org = TRUE;
                } else {
                    if (e_cal_get_static_capability (
                                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 (client, CAL_STATIC_CAPABILITY_NO_ORGANIZER) && (flags & COMP_EDITOR_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);

                if (!priv->user_org) {
                    gtk_list_store_clear (GTK_LIST_STORE (gtk_combo_box_get_model (GTK_COMBO_BOX (priv->organizer))));
                    gtk_combo_box_append_text (GTK_COMBO_BOX (priv->organizer), string);
                    gtk_combo_box_set_active (GTK_COMBO_BOX (priv->organizer), 0);
                    gtk_editable_set_editable (GTK_EDITABLE (gtk_bin_get_child (GTK_BIN (priv->organizer))), FALSE);
                } else {
                    gtk_entry_set_text (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->organizer))), string);
                }

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

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

                if (!(backend_addr && *backend_addr) || !g_ascii_strcasecmp (backend_addr, a->id->address)) {
                    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));
                } else {
                    e_meeting_attendee_set_address (priv->ia, g_strdup_printf ("MAILTO:%s", backend_addr));
                    e_meeting_attendee_set_sentby (priv->ia, g_strdup_printf ("MAILTO:%s", a->id->address));
                }

                if (client && e_cal_get_organizer_must_accept (client))
                    e_meeting_attendee_set_status (priv->ia, ICAL_PARTSTAT_NEEDSACTION);
                else
                    e_meeting_attendee_set_status (priv->ia, ICAL_PARTSTAT_ACCEPTED);
                e_meeting_list_view_add_attendee_to_name_selector (E_MEETING_LIST_VIEW (priv->list_view), priv->ia);
            }
        }
    }

    if (backend_addr)
        g_free (backend_addr);

    sensitize_widgets (tpage);

    return TRUE;
}

static void
set_attendees (ECalComponent *comp, const GPtrArray *attendees)
{
    GSList *comp_attendees = NULL, *l;
    gint 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;
    ECalComponentClassification classification;
    ECalComponentDateTime date;
    CompEditor *editor;
    CompEditorFlags flags;
    ECal *client;
    struct icaltimetype start_tt, due_tt;
    gchar *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));

    editor = comp_editor_page_get_editor (page);
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    /* 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. */
    classification = comp_editor_get_classification (editor);
    e_cal_component_set_classification (comp, 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 *backend_addr = NULL, *org_addr = NULL, *sentby = NULL;

            e_cal_get_cal_address (client, &backend_addr, NULL);

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

            /* Sanity Check */
            if (a == NULL) {
                e_notice (priv->main, 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 (priv->main, GTK_MESSAGE_ERROR,
                        _("An organizer is required."));
                return FALSE;
            }

            if (!(backend_addr && *backend_addr) || !g_ascii_strcasecmp (backend_addr, a->id->address)) {
                org_addr = g_strdup_printf ("MAILTO:%s", a->id->address);
                organizer.value = org_addr;
                organizer.cn = a->id->name;
            } else {
                org_addr = g_strdup_printf ("MAILTO:%s", backend_addr);
                sentby = g_strdup_printf ("MAILTO:%s", a->id->address);
                organizer.value = org_addr;
                organizer.sentby = sentby;
            }

            e_cal_component_set_organizer (comp, &organizer);

            g_free (backend_addr);
            g_free (org_addr);
            g_free (sentby);
        }

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

        if (flags & COMP_EDITOR_DELEGATE ) {
            GSList *attendee_list, *l;
            gint 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;
    CompEditor *editor;
    CompEditorFlags flags;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    flags = comp_editor_get_flags (editor);

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

    if (flags & COMP_EDITOR_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);
}

static void edit_clicked_cb (GtkButton *btn, TaskPage *tpage)
{
    TaskPagePrivate *priv;
    GtkTreePath *path = NULL;
    GtkTreeViewColumn *focus_col;

    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;
    const gchar *ia_sentby = NULL;

    ia_address = itip_strip_mailto (e_meeting_attendee_get_address (ia));
    if (!ia_address)
        return FALSE;

    if (e_meeting_attendee_is_set_sentby (ia))
        ia_sentby = itip_strip_mailto (e_meeting_attendee_get_sentby (ia));

    e_cal_component_get_attendee_list (comp, &attendees);

    for (l = attendees; l; l = l->next) {
        ECalComponentAttendee *attendee = l->data;
        const gchar *address;
        const gchar *sentby = NULL;

        address = itip_strip_mailto (attendee->value);
        if (attendee->sentby)
            sentby = itip_strip_mailto (attendee->sentby);

        if ((address && !g_ascii_strcasecmp (ia_address, address)) || (sentby && ia_sentby && !g_ascii_strcasecmp (ia_sentby, sentby))) {
            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 = page->priv;
    CompEditor *editor;
    CompEditorFlags flags;
    gint pos = 0;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    flags = comp_editor_get_flags (editor);

    /* 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 (!(flags & COMP_EDITOR_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) && !comp_editor_have_in_new_attendees (priv->comp, ia)) {
            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);

        comp_editor_manage_new_attendees (priv->comp, ia, FALSE);
        e_meeting_list_view_remove_attendee_from_name_selector (priv->list_view, ia);
        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;
    GtkTreeModel *model = NULL;
    gboolean valid_iter;
    gchar *address;

    priv = page->priv;

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (priv->list_view));
    model = GTK_TREE_MODEL (priv->model);
    if (!(paths = gtk_tree_selection_get_selected_rows (selection, &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,
           TaskPage *page)
{
    e_meeting_list_view_invite_others_dialog (page->priv->list_view);
}

static void
attendee_added_cb (EMeetingListView *emlv,
                   EMeetingAttendee *ia,
                   TaskPage *page)
{
    TaskPagePrivate *priv = page->priv;
    CompEditor *editor;
    CompEditorFlags flags;
    ECal *client;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    if (!(flags & COMP_EDITOR_DELEGATE)) {
        comp_editor_manage_new_attendees (priv->comp, ia, TRUE);
        return;
    }

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

            delegator = e_meeting_store_find_attendee (priv->model, delegator_id, NULL);

            g_return_if_fail (delegator != 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);
        }
    }
}

static gboolean
list_view_event (EMeetingListView *list_view, GdkEvent *event, TaskPage *page) {

    TaskPagePrivate *priv= page->priv;
    CompEditor *editor;
    CompEditorFlags flags;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    flags = comp_editor_get_flags (editor);

    if (event->type == GDK_2BUTTON_PRESS && flags & COMP_EDITOR_USER_ORG) {
        EMeetingAttendee *attendee;

        attendee = e_meeting_store_add_attendee_with_defaults (priv->model);

        if (flags & COMP_EDITOR_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) {

        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, (gpointer) icaltimezone_get_tzid (zone), zone);
    }

    return TRUE;
}

/*If the msg has some value set, the icon should always be set */
void
task_page_set_info_string (TaskPage *tpage, const gchar *icon, const gchar *msg)
{
    TaskPagePrivate *priv;

    priv = tpage->priv;

    gtk_image_set_from_stock (GTK_IMAGE (priv->info_icon), icon, GTK_ICON_SIZE_BUTTON);
    gtk_label_set_markup (GTK_LABEL(priv->info_string), msg);

    if (msg && icon)
        gtk_widget_show (priv->info_hbox);
    else
        gtk_widget_hide (priv->info_hbox);
}

/* 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);
    GtkEntryCompletion *completion;
    TaskPagePrivate *priv;
    GSList *accel_groups;
    GtkWidget *toplevel;
    GtkWidget *sw;
    GtkTreeSelection *selection;

    priv = tpage->priv;

    priv->main = e_builder_get_widget (priv->builder, "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 = g_object_ref (accel_groups->data);

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

    priv->info_hbox = e_builder_get_widget (priv->builder, "generic-info");
    priv->info_icon = e_builder_get_widget (priv->builder, "generic-info-image");
    priv->info_string = e_builder_get_widget (priv->builder, "generic-info-msgs");

    priv->summary = e_builder_get_widget (priv->builder, "summary");
    priv->summary_label = e_builder_get_widget (priv->builder, "summary-label");

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

    priv->timezone = e_builder_get_widget (priv->builder, "timezone");
    priv->timezone_label = e_builder_get_widget (priv->builder, "timezone-label");
    priv->attendees_label = e_builder_get_widget (priv->builder, "attendees-label");
    priv->description = e_builder_get_widget (priv->builder, "description");
    priv->categories_btn = e_builder_get_widget (priv->builder, "categories-button");
    priv->categories = e_builder_get_widget (priv->builder, "categories");

    priv->organizer = e_builder_get_widget (priv->builder, "organizer");
    gtk_list_store_clear (GTK_LIST_STORE (gtk_combo_box_get_model (GTK_COMBO_BOX (priv->organizer))));
    gtk_combo_box_entry_set_text_column (GTK_COMBO_BOX_ENTRY (priv->organizer), 0);

    priv->invite = e_builder_get_widget (priv->builder, "invite");
    priv->add = e_builder_get_widget (priv->builder, "add-attendee");
    priv->edit = e_builder_get_widget (priv->builder, "edit-attendee");
    priv->remove = e_builder_get_widget (priv->builder, "remove-attendee");
    priv->list_box = e_builder_get_widget (priv->builder, "list-box");
    priv->calendar_label = e_builder_get_widget (priv->builder, "group-label");
    priv->attendee_box = e_builder_get_widget (priv->builder, "attendee-box");
    priv->org_cal_label = e_builder_get_widget (priv->builder, "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 = e_builder_get_widget (priv->builder, "source");
    e_util_set_source_combo_box_list (priv->source_selector, "/apps/evolution/tasks/sources");

    gtk_label_set_mnemonic_widget (GTK_LABEL (priv->calendar_label), priv->source_selector);

    completion = e_category_completion_new ();
    gtk_entry_set_completion (GTK_ENTRY (priv->categories), completion);
    g_object_unref (completion);

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

static void
summary_changed_cb (GtkEditable *editable,
                    CompEditorPage *page)
{
    CompEditor *editor;
    gchar *summary;

    if (comp_editor_page_get_updating (page))
        return;

    editor = comp_editor_page_get_editor (page);
    summary = e_dialog_editable_get (GTK_WIDGET (editable));
    comp_editor_set_summary (editor, 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,
                 TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->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();

    priv = tpage->priv;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tpage)))
        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,
                     TaskPage *tpage)
{
    date_changed_cb ((EDateEdit *) tpage->priv->start_date, tpage);
    date_changed_cb ((EDateEdit *) tpage->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,
                       TaskPage *tpage)
{
    GtkEntry *entry;

    entry = GTK_ENTRY (tpage->priv->categories);
    e_categories_config_open_dialog_for_entry (entry);
}

static gboolean
check_start_before_end (struct icaltimetype *start_tt,
            icaltimezone *start_zone,
            struct icaltimetype *end_tt,
            icaltimezone *end_zone,
            gboolean adjust_end_time,
            gboolean adjust_by_hour)
{
    struct icaltimetype end_tt_copy;
    gint cmp;

    /* Convert the end time to the same timezone as the start time. */
    end_tt_copy = *end_tt;
    icaltimezone_convert_time (&end_tt_copy, end_zone, start_zone);

    /* Now check if the start time is after the end time. If it is,
       we need to modify one of the times. */
    cmp = icaltime_compare (*start_tt, end_tt_copy);
    if (cmp > 0) {
        if (adjust_end_time) {
            /* Modify the end time, to be the start + 1 hour/day. */
            *end_tt = *start_tt;
            icaltime_adjust (end_tt, 0, adjust_by_hour ? 1 : 24, 0, 0);
            icaltimezone_convert_time (end_tt, start_zone,
                           end_zone);
        } else {
            /* Modify the start time, to be the end - 1 hour/day. */
            *start_tt = *end_tt;
            icaltime_adjust (start_tt, 0, adjust_by_hour ? -1 : -24, 0, 0);
            icaltimezone_convert_time (start_tt, end_zone,
                           start_zone);
        }
        return TRUE;
    }

    return FALSE;
}

/*
 * This is called whenever the start or due dates.
 * It makes sure that the start date < end date. It also emits the notification
 * signals so the other event editor pages update their labels etc.
 *
 * If adjust_end_time is TRUE, if the start time < end time it will adjust
 * the end time. If FALSE it will adjust the start time. If the user sets the
 * start or end time, the other time is adjusted to make it valid.
 *
 * Time part of the value is changed only when both edits have time set,
 * otherwise times will differ one hour.
 */
static void
times_updated (TaskPage *tpage, gboolean adjust_end_time)
{
    TaskPagePrivate *priv;
    struct icaltimetype start_tt = icaltime_null_time();
    struct icaltimetype end_tt = icaltime_null_time();
    gboolean date_set;
    gboolean set_start_date = FALSE, set_end_date = FALSE, adjust_by_hour;
    icaltimezone *zone;

    priv = tpage->priv;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tpage)))
        return;

    date_set = e_date_edit_get_date (E_DATE_EDIT (priv->start_date),
                     &start_tt.year,
                     &start_tt.month,
                     &start_tt.day);
    if (!date_set)
        return;

    date_set = e_date_edit_get_date (E_DATE_EDIT (priv->due_date),
                     &end_tt.year,
                     &end_tt.month,
                     &end_tt.day);
    if (!date_set)
        return;

    /* For DATE-TIME events, we have to convert to the same
       timezone before comparing. */
    e_date_edit_get_time_of_day (E_DATE_EDIT (priv->start_date),
                     &start_tt.hour,
                     &start_tt.minute);
    e_date_edit_get_time_of_day (E_DATE_EDIT (priv->due_date),
                     &end_tt.hour,
                     &end_tt.minute);

    zone = e_timezone_entry_get_timezone (E_TIMEZONE_ENTRY (priv->timezone));
    adjust_by_hour = e_date_edit_have_time (E_DATE_EDIT (priv->due_date)) &&
             e_date_edit_have_time (E_DATE_EDIT (priv->start_date));

    if (check_start_before_end (&start_tt, zone,
                    &end_tt, zone,
                    adjust_end_time,
                    adjust_by_hour)) {
        if (adjust_end_time)
            set_end_date = TRUE;
        else
            set_start_date = TRUE;
    }

    if (set_start_date) {
        g_signal_handlers_block_matched (priv->start_date, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, tpage);
        e_date_edit_set_date (E_DATE_EDIT (priv->start_date), start_tt.year, start_tt.month, start_tt.day);
        if (adjust_by_hour)
            e_date_edit_set_time_of_day (E_DATE_EDIT (priv->start_date), start_tt.hour, start_tt.minute);
        g_signal_handlers_unblock_matched (priv->start_date, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, tpage);
    }

    if (set_end_date) {
        g_signal_handlers_block_matched (priv->due_date, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, tpage);
        e_date_edit_set_date (E_DATE_EDIT (priv->due_date), end_tt.year, end_tt.month, end_tt.day);
        if (adjust_by_hour)
            e_date_edit_set_time_of_day (E_DATE_EDIT (priv->due_date), end_tt.hour, end_tt.minute);
        g_signal_handlers_unblock_matched (priv->due_date, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, tpage);
    }

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

static void
start_date_changed_cb (TaskPage *tpage)
{
    times_updated (tpage, TRUE);
}

static void
due_date_changed_cb (TaskPage *tpage)
{
    times_updated (tpage, FALSE);
}

static void
source_changed_cb (ESourceComboBox *source_combo_box, TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->priv;
    CompEditor *editor;
    ESource *source;
    ECal *client;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));
    source = e_source_combo_box_get_active (source_combo_box);

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tpage)))
        return;

    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);

        client = comp_editor_get_client (editor);

        e_source_combo_box_set_active (
            E_SOURCE_COMBO_BOX (priv->source_selector),
            e_cal_get_source (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_set_client (editor, client);
        comp_editor_page_changed (COMP_EDITOR_PAGE (tpage));
        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);

        if (client) {
            gchar *backend_addr = NULL;

            e_cal_get_cal_address(client, &backend_addr, NULL);

            if (priv->is_assignment)
                task_page_select_organizer (tpage, backend_addr);

            set_subscriber_info_string (tpage, backend_addr);
            g_free (backend_addr);
        }

        sensitize_widgets (tpage);
    }
}

static void
set_subscriber_info_string (TaskPage *tpage, const gchar *backend_address)
{
    CompEditor *editor;
    ECal *client;
    ESource *source;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));
    client = comp_editor_get_client (editor);
    source = e_cal_get_source (client);

    if (e_source_get_property (source, "subscriber")) {
        g_free (tpage->priv->subscriber_info_text);
        /* Translators: This string is used when we are creating a Task
           on behalf of some other user */
        tpage->priv->subscriber_info_text = g_markup_printf_escaped (_("You are acting on behalf of %s"), backend_address);

        task_page_set_info_string (tpage, GTK_STOCK_DIALOG_INFO, tpage->priv->subscriber_info_text);
    } else {
        g_free (tpage->priv->subscriber_info_text);
        tpage->priv->subscriber_info_text = NULL;

        task_page_set_info_string (tpage, NULL, NULL);
    }
}

void
task_page_sendoptions_clicked_cb (TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->priv;
    CompEditor *editor;
    GtkWidget *toplevel;
    ESource *source;
    ECal *client;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));
    client = comp_editor_get_client (editor);

    if (!priv->sod) {
        priv->sod = e_sendoptions_dialog_new ();
        priv->sod->data->initialized = TRUE;
        source = e_source_combo_box_get_active (
            E_SOURCE_COMBO_BOX (priv->source_selector));
        e_sendoptions_utils_set_default_data (priv->sod, source, "task");
    }

    if (e_cal_get_static_capability (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)
{
    CompEditor *editor;
    TaskPagePrivate *priv;
    GtkAction *action;
    GtkTextBuffer *text_buffer;
    icaltimezone *zone;
    gboolean active;

    priv = tpage->priv;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));

    /* 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);

    /* Generic informative messages */
    gtk_widget_hide (priv->info_hbox);

    /* 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);

    e_buffer_tagger_connect (GTK_TEXT_VIEW (priv->description));

    /* 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, "changed", 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. */

    /* Belongs to priv->description */
    g_signal_connect_swapped (
        text_buffer, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->summary, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->start_date, "changed",
        G_CALLBACK (start_date_changed_cb), tpage);
    g_signal_connect_swapped (
        priv->start_date, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->due_date, "changed",
        G_CALLBACK (due_date_changed_cb), tpage);
    g_signal_connect_swapped (
        priv->due_date, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->timezone, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->categories, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);

    g_signal_connect (
        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);

    action = comp_editor_get_action (editor, "view-time-zone");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    task_page_set_show_timezone (tpage, active);

    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_ATTENDEE_COL, TRUE);

    action = comp_editor_get_action (editor, "view-role");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_ROLE_COL, active);

    action = comp_editor_get_action (editor, "view-rsvp");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_RSVP_COL, active);

    action = comp_editor_get_action (editor, "view-status");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_STATUS_COL, active);

    action = comp_editor_get_action (editor, "view-type");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_TYPE_COL, active);

    action = comp_editor_get_action (editor, "view-categories");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    task_page_set_show_categories (tpage, active);

    return TRUE;
}



static void
task_page_select_organizer (TaskPage *tpage, const gchar *backend_address)
{
    TaskPagePrivate *priv = tpage->priv;
    CompEditor *editor;
    GList *l;
    EAccount *def_account;
    gchar *def_address = NULL;
    const gchar *default_address;
    gboolean subscribed_cal = FALSE;
    ESource *source = NULL;
    ECal *client;
    const gchar *user_addr = NULL;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));
    client = comp_editor_get_client (editor);

    def_account = itip_addresses_get_default();
    if (def_account && def_account->enabled)
        def_address = g_strdup_printf("%s <%s>", def_account->id->name, def_account->id->address);

    if (client)
        source = e_cal_get_source (client);
    if (source)
        user_addr = e_source_get_property (source, "subscriber");

    if (user_addr)
        subscribed_cal = TRUE;
    else
        user_addr = (backend_address && *backend_address) ? backend_address : NULL;

    default_address = NULL;
    if (user_addr)
        for (l = priv->address_strings; l != NULL; l = l->next)
            if (g_strrstr ((gchar *) l->data, user_addr) != NULL) {
                default_address = (const gchar *) l->data;
                break;
            }

    if (!default_address && def_address)
        default_address = def_address;

    if (default_address) {
        if (!priv->comp || !e_cal_component_has_organizer (priv->comp)) {
            gtk_entry_set_text (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->organizer))), default_address);
            gtk_widget_set_sensitive (priv->organizer, !subscribed_cal);
        }
    } else
        g_warning ("No potential organizers!");

    g_free (def_address);
}

/**
 * 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;
    EIterator *it;
    EAccount *a;

    priv = tpage->priv;
    g_object_ref (model);
    priv->model = model;
    priv->client = client;

    priv->builder = gtk_builder_new ();
    e_load_ui_builder_definition (priv->builder, "task-page.ui");

    if (!get_widgets (tpage)) {
        g_message ("task_page_construct(): "
               "Could not find all widgets in the XML file!");
        return NULL;
    }

    priv->accounts = itip_addresses_get ();
    for (it = e_list_get_iterator((EList *)priv->accounts);
         e_iterator_is_valid(it);
         e_iterator_next(it)) {
        gchar *full = NULL;

        a = (EAccount *)e_iterator_get(it);

        /* skip disabled accounts */
        if (!a->enabled)
            continue;

        full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);

        priv->address_strings = g_list_append(priv->address_strings, full);
    }

    g_object_unref(it);

    if (priv->address_strings) {
        GList *l;

        for (l = priv->address_strings; l; l = l->next)
            gtk_combo_box_append_text (GTK_COMBO_BOX (priv->organizer), l->data);

        gtk_combo_box_set_active (GTK_COMBO_BOX (priv->organizer), 0);
    } else
        g_warning ("No potential organizers!");

    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, CompEditor *editor)
{
    TaskPage *tpage;
    ECal *client;

    tpage = g_object_new (TYPE_TASK_PAGE, "editor", editor, NULL);
    client = comp_editor_get_client (editor);
    if (!task_page_construct (tpage, model, client)) {
        g_object_unref (tpage);
        g_return_val_if_reached (NULL);
    }

    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);
}

/**
 * task_page_add_attendee
 * Add attendee to meeting store and name selector.
 * @param tpage TaskPage.
 * @param attendee Attendee to be added.
 **/
void
task_page_add_attendee (TaskPage *tpage, EMeetingAttendee *attendee)
{
    TaskPagePrivate *priv;

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

    priv = tpage->priv;

    e_meeting_store_add_attendee (priv->model, attendee);
    e_meeting_list_view_add_attendee_to_name_selector (E_MEETING_LIST_VIEW (priv->list_view), attendee);
}