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

/*
 * Evolution calendar - task details page
 *
 * 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 <gtk/gtk.h>
#include <glib/gi18n.h>
#include <misc/e-dateedit.h>
#include <misc/e-url-entry.h>
#include "../e-timezone-entry.h"
#include "comp-editor-util.h"
#include "task-details-page.h"

#include "e-util/e-util.h"
#include "e-util/e-dialog-widgets.h"
#include "e-util/e-util-private.h"

#define TASK_DETAILS_PAGE_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), TYPE_TASK_DETAILS_PAGE, TaskDetailsPagePrivate))

struct _TaskDetailsPagePrivate {
    GtkBuilder *builder;

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

    GtkWidget *status_combo;
    GtkWidget *priority_combo;
    GtkWidget *percent_complete;

    GtkWidget *date_completed_label;
    GtkWidget *completed_date;

    GtkWidget *url_label;
    GtkWidget *url_entry;
    GtkWidget *url;
};

/* Note that these two arrays must match. */
static const gint status_map[] = {
    ICAL_STATUS_NONE,
    ICAL_STATUS_INPROCESS,
    ICAL_STATUS_COMPLETED,
    ICAL_STATUS_CANCELLED,
    -1
};

typedef enum {
    PRIORITY_HIGH,
    PRIORITY_NORMAL,
    PRIORITY_LOW,
    PRIORITY_UNDEFINED
} TaskEditorPriority;

static const gint priority_map[] = {
    PRIORITY_HIGH,
    PRIORITY_NORMAL,
    PRIORITY_LOW,
    PRIORITY_UNDEFINED,
    -1
};

G_DEFINE_TYPE (TaskDetailsPage, task_details_page, TYPE_COMP_EDITOR_PAGE)

static TaskEditorPriority
priority_value_to_index (gint priority_value)
{
    TaskEditorPriority retval;

    if (priority_value == 0)
        retval = PRIORITY_UNDEFINED;
    else if (priority_value <= 4)
        retval = PRIORITY_HIGH;
    else if (priority_value == 5)
        retval = PRIORITY_NORMAL;
    else
        retval = PRIORITY_LOW;

    return retval;
}

static gint
priority_index_to_value (TaskEditorPriority priority)
{
    gint retval;

    switch (priority) {
    case PRIORITY_UNDEFINED:
        retval = 0;
        break;
    case PRIORITY_HIGH:
        retval = 3;
        break;
    case PRIORITY_NORMAL:
        retval = 5;
        break;
    case PRIORITY_LOW:
        retval = 7;
        break;
    default:
        retval = 0;
        break;
    }

    return retval;
}

/* Fills the widgets with default values */
static void
clear_widgets (TaskDetailsPage *tdpage)
{
    TaskDetailsPagePrivate *priv;

    priv = tdpage->priv;

    /* Date completed */
    e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), -1);

    /* URL */
    gtk_entry_set_text (GTK_ENTRY (priv->url), "");
}

static void
sensitize_widgets (TaskDetailsPage *tdpage)
{
    TaskDetailsPagePrivate *priv = tdpage->priv;
    CompEditor *editor;
    GtkWidget *entry;
    ECalClient *client;
    gboolean read_only;

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

    read_only = e_client_is_readonly (E_CLIENT (client));

    gtk_widget_set_sensitive (priv->status_combo, !read_only);
    gtk_widget_set_sensitive (priv->priority_combo, !read_only);
    gtk_widget_set_sensitive (priv->percent_complete, !read_only);
    gtk_widget_set_sensitive (priv->completed_date, !read_only);
    gtk_widget_set_sensitive (priv->url_label, !read_only);

    entry = e_url_entry_get_entry (E_URL_ENTRY (priv->url_entry));
    gtk_editable_set_editable (GTK_EDITABLE (entry), !read_only);
}

static void
task_details_page_dispose (GObject *object)
{
    TaskDetailsPagePrivate *priv;

    priv = TASK_DETAILS_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;
    }

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

static GtkWidget *
task_details_page_get_widget (CompEditorPage *page)
{
    TaskDetailsPage *tdpage;
    TaskDetailsPagePrivate *priv;

    tdpage = TASK_DETAILS_PAGE (page);
    priv = tdpage->priv;

    return priv->main;
}

static void
task_details_page_focus_main_widget (CompEditorPage *page)
{
    TaskDetailsPage *tdpage;
    TaskDetailsPagePrivate *priv;

    tdpage = TASK_DETAILS_PAGE (page);
    priv = tdpage->priv;

    gtk_widget_grab_focus (priv->status_combo);
}

static gboolean
task_details_page_fill_widgets (CompEditorPage *page,
                                ECalComponent *comp)
{
    TaskDetailsPage *tdpage;
    TaskDetailsPagePrivate *priv;
    gint *priority_value, *percent = NULL;
    TaskEditorPriority priority;
    icalproperty_status status;
    CompEditor *editor;
    const gchar *url;
    struct icaltimetype *completed = NULL;

    tdpage = TASK_DETAILS_PAGE (page);
    priv = tdpage->priv;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tdpage));

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

    /* Percent Complete. */
    e_cal_component_get_percent (comp, &percent);
    if (percent) {
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), *percent);
    } else {
        /* FIXME: Could check if task is completed and set 100%. */
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), 0);
    }

    /* Status. */
    e_cal_component_get_status (comp, &status);
    if (status == ICAL_STATUS_NONE || status == ICAL_STATUS_NEEDSACTION) {
        /* Try to use the percent value. */
        if (percent) {
            if (*percent == 100)
                status = ICAL_STATUS_COMPLETED;
            else if (*percent > 0)
                status = ICAL_STATUS_INPROCESS;
            else
                status = ICAL_STATUS_NONE;
        } else
            status = ICAL_STATUS_NONE;
    }
    e_dialog_combo_box_set (priv->status_combo, status, status_map);

    if (percent)
        e_cal_component_free_percent (percent);

    /* Completed Date. */
    e_cal_component_get_completed (comp, &completed);
    if (completed) {
        icaltimezone *utc_zone, *zone;

        /* Completed is in UTC, but that would confuse the user, so
         * we convert it to local time. */
        utc_zone = icaltimezone_get_utc_timezone ();
        zone = comp_editor_get_timezone (editor);

        icaltimezone_convert_time (completed, utc_zone, zone);

        e_date_edit_set_date (
            E_DATE_EDIT (priv->completed_date),
            completed->year, completed->month,
            completed->day);
        e_date_edit_set_time_of_day (
            E_DATE_EDIT (priv->completed_date),
            completed->hour,
            completed->minute);

        e_cal_component_free_icaltimetype (completed);
    }

    /* Priority. */
    e_cal_component_get_priority (comp, &priority_value);
    if (priority_value) {
        priority = priority_value_to_index (*priority_value);
        e_cal_component_free_priority (priority_value);
    } else {
        priority = PRIORITY_UNDEFINED;
    }
    e_dialog_combo_box_set (priv->priority_combo, priority, priority_map);

    /* URL */
    e_cal_component_get_url (comp, &url);
    gtk_entry_set_text (GTK_ENTRY (priv->url), url ? url : "");

    sensitize_widgets (tdpage);

    return TRUE;
}

static gboolean
task_details_page_fill_component (CompEditorPage *page,
                                  ECalComponent *comp)
{
    TaskDetailsPage *tdpage;
    TaskDetailsPagePrivate *priv;
    struct icaltimetype icalcomplete, icaltoday;
    icalproperty_status status;
    TaskEditorPriority priority;
    CompEditor *editor;
    gint priority_value, percent;
    const gchar *text;
    gboolean date_set;
    icaltimezone *zone;

    tdpage = TASK_DETAILS_PAGE (page);
    priv = tdpage->priv;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tdpage));
    zone = comp_editor_get_timezone (editor);

    /* Percent Complete. */
    percent = gtk_spin_button_get_value_as_int (
        GTK_SPIN_BUTTON (priv->percent_complete));
    e_cal_component_set_percent (comp, &percent);

    /* Status. */
    status = e_dialog_combo_box_get (priv->status_combo, status_map);
    e_cal_component_set_status (comp, status);

    /* Priority. */
    priority = e_dialog_combo_box_get (priv->priority_combo, priority_map);
    priority_value = priority_index_to_value (priority);
    e_cal_component_set_priority (comp, &priority_value);

    icalcomplete = icaltime_null_time ();

    /* COMPLETED must be in UTC. */
    icalcomplete.is_utc = 1;

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

    date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->completed_date),
        &icalcomplete.year,
        &icalcomplete.month,
        &icalcomplete.day);

    if (date_set) {
        e_date_edit_get_time_of_day (
            E_DATE_EDIT (priv->completed_date),
            &icalcomplete.hour,
            &icalcomplete.minute);

        /* COMPLETED today or before */
        icaltoday = icaltime_current_time_with_zone (zone);
        icaltimezone_convert_time (
            &icaltoday, zone,
            icaltimezone_get_utc_timezone ());

        if (icaltime_compare_date_only (icalcomplete, icaltoday) > 0) {
            comp_editor_page_display_validation_error (
                page, _("Completed date is wrong"),
                priv->completed_date);
            return FALSE;
        }

        /* COMPLETED must be in UTC, so we assume that the date in the
         * dialog is in the current timezone, and we now convert it
         * to UTC. FIXME: We should really use one timezone for the
         * entire time the dialog is shown. Otherwise if the user
         * changes the timezone, the COMPLETED date may get changed
         * as well. */
        icaltimezone_convert_time (
            &icalcomplete, zone,
                icaltimezone_get_utc_timezone ());
        e_cal_component_set_completed (comp, &icalcomplete);
    } else {
        e_cal_component_set_completed (comp, NULL);
    }

    /* URL. */
    text = gtk_entry_get_text (GTK_ENTRY (priv->url));
    e_cal_component_set_url (comp, text);

    return TRUE;
}

static gboolean
task_details_page_fill_timezones (CompEditorPage *page,
                                  GHashTable *timezones)
{
    icaltimezone *zone;

    /* Add UTC timezone, which is the one
     * used for the DATE-COMPLETED property. */
    zone = icaltimezone_get_utc_timezone ();
    if (zone != NULL) {
        gconstpointer tzid = icaltimezone_get_tzid (zone);

        if (!g_hash_table_lookup (timezones, tzid))
            g_hash_table_insert (timezones, (gpointer) tzid, zone);
    }

    return TRUE;
}

static void
task_details_page_class_init (TaskDetailsPageClass *class)
{
    GObjectClass *object_class;
    CompEditorPageClass *editor_page_class;

    g_type_class_add_private (class, sizeof (TaskDetailsPagePrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->dispose = task_details_page_dispose;

    editor_page_class = COMP_EDITOR_PAGE_CLASS (class);
    editor_page_class->get_widget = task_details_page_get_widget;
    editor_page_class->focus_main_widget = task_details_page_focus_main_widget;
    editor_page_class->fill_widgets = task_details_page_fill_widgets;
    editor_page_class->fill_component = task_details_page_fill_component;
    editor_page_class->fill_timezones = task_details_page_fill_timezones;
}

static void
task_details_page_init (TaskDetailsPage *tdpage)
{
    tdpage->priv = TASK_DETAILS_PAGE_GET_PRIVATE (tdpage);
}

/* Gets the widgets from the XML file and returns if they are all available. */
static gboolean
get_widgets (TaskDetailsPage *tdpage)
{
    CompEditorPage *page = COMP_EDITOR_PAGE (tdpage);
    TaskDetailsPagePrivate *priv;
    GSList *accel_groups;
    GtkWidget *toplevel;
    GtkWidget *parent;

    priv = tdpage->priv;

#define GW(name) e_builder_get_widget (priv->builder, name)

    priv->main = GW ("task-details-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);
    parent = gtk_widget_get_parent (priv->main);
    gtk_container_remove (GTK_CONTAINER (parent), priv->main);

    priv->status_combo = GW ("status-combobox");
    priv->priority_combo = GW ("priority-combobox");
    priv->percent_complete = GW ("percent-complete");

    priv->date_completed_label = GW ("date_completed_label");

    priv->completed_date = GW ("completed-date");
    gtk_widget_show (priv->completed_date);

    priv->url_label = GW ("url_label");

    priv->url_entry = GW ("url_entry");
    gtk_widget_show (priv->url_entry);
    priv->url = e_url_entry_get_entry (E_URL_ENTRY (priv->url_entry));
    atk_object_set_name (gtk_widget_get_accessible (priv->url), _("Web Page"));

#undef GW

    return (priv->status_combo
        && priv->priority_combo
        && priv->percent_complete
        && priv->date_completed_label
        && priv->completed_date
        && priv->url_label
        && priv->url);
}

static void
complete_date_changed (TaskDetailsPage *tdpage,
                       time_t ctime,
                       gboolean complete)
{
    CompEditorPageDates dates = {NULL, NULL, NULL, NULL};
    icaltimezone *zone;
    struct icaltimetype completed_tt = icaltime_null_time ();

    /* Get the current time in UTC. */
    zone = icaltimezone_get_utc_timezone ();
    completed_tt = icaltime_from_timet_with_zone (ctime, FALSE, zone);
    completed_tt.is_utc = TRUE;

    dates.start = NULL;
    dates.end = NULL;
    dates.due = NULL;
    if (complete)
        dates.complete = &completed_tt;

    /* Notify upstream */
    comp_editor_page_notify_dates_changed (COMP_EDITOR_PAGE (tdpage),
                           &dates);
}

static void
date_changed_cb (EDateEdit *dedit,
                 TaskDetailsPage *tdpage)
{
    TaskDetailsPagePrivate *priv = tdpage->priv;
    CompEditorPageDates dates = {NULL, NULL, NULL, NULL};
    struct icaltimetype completed_tt = icaltime_null_time ();
    icalproperty_status status;
    gboolean date_set;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tdpage)))
        return;

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tdpage), TRUE);

    date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->completed_date),
        &completed_tt.year,
        &completed_tt.month,
        &completed_tt.day);
    e_date_edit_get_time_of_day (
        E_DATE_EDIT (priv->completed_date),
        &completed_tt.hour,
        &completed_tt.minute);

    status = e_dialog_combo_box_get (priv->status_combo, status_map);

    if (!date_set) {
        completed_tt = icaltime_null_time ();
        if (status == ICAL_STATUS_COMPLETED) {
            e_dialog_combo_box_set (
                priv->status_combo,
                ICAL_STATUS_NONE,
                status_map);
            gtk_spin_button_set_value (
                GTK_SPIN_BUTTON (priv->percent_complete), 0);
        }
    } else {
        if (status != ICAL_STATUS_COMPLETED) {
            e_dialog_combo_box_set (
                priv->status_combo,
                ICAL_STATUS_COMPLETED,
                status_map);
        }
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), 100);
    }

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tdpage), FALSE);

    /* Notify upstream */
    dates.complete = &completed_tt;
    comp_editor_page_notify_dates_changed (COMP_EDITOR_PAGE (tdpage), &dates);
}

static void
status_changed (GtkWidget *combo,
                TaskDetailsPage *tdpage)
{
    TaskDetailsPagePrivate *priv;
    icalproperty_status status;
    CompEditor *editor;
    time_t ctime = -1;

    priv = tdpage->priv;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tdpage)))
        return;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tdpage));

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tdpage), TRUE);

    status = e_dialog_combo_box_get (priv->status_combo, status_map);
    if (status == ICAL_STATUS_NONE) {
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), 0);
        e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), ctime);
        complete_date_changed (tdpage, 0, FALSE);
    } else if (status == ICAL_STATUS_INPROCESS) {
        gint percent_complete = gtk_spin_button_get_value_as_int (
            GTK_SPIN_BUTTON (priv->percent_complete));
        if (percent_complete <= 0 || percent_complete >= 100)
            gtk_spin_button_set_value (
                GTK_SPIN_BUTTON (priv->percent_complete), 50);

        e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), ctime);
        complete_date_changed (tdpage, 0, FALSE);
    } else if (status == ICAL_STATUS_COMPLETED) {
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), 100);
        ctime = time (NULL);
        e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), ctime);
        complete_date_changed (tdpage, ctime, TRUE);
    }

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tdpage), FALSE);

    comp_editor_set_changed (editor, TRUE);
}

static void
percent_complete_changed (GtkAdjustment *adj,
                          TaskDetailsPage *tdpage)
{
    TaskDetailsPagePrivate *priv;
    gint percent;
    icalproperty_status status;
    CompEditor *editor;
    gboolean complete;
    time_t ctime = -1;

    priv = tdpage->priv;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tdpage)))
        return;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tdpage));

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tdpage), TRUE);

    percent = gtk_spin_button_get_value_as_int (
        GTK_SPIN_BUTTON (priv->percent_complete));
    if (percent == 100) {
        complete = TRUE;
        ctime = time (NULL);
        status = ICAL_STATUS_COMPLETED;
    } else {
        complete = FALSE;

        if (percent == 0)
            status = ICAL_STATUS_NONE;
        else
            status = ICAL_STATUS_INPROCESS;
    }

    e_dialog_combo_box_set (priv->status_combo, status, status_map);
    e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), ctime);
    complete_date_changed (tdpage, ctime, complete);

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tdpage), FALSE);

    comp_editor_set_changed (editor, TRUE);
}

/* Hooks the widget signals */
static void
init_widgets (TaskDetailsPage *tdpage)
{
    TaskDetailsPagePrivate *priv;
    GtkAdjustment *adjustment;
    CompEditor *editor;

    priv = tdpage->priv;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tdpage));

    /* Make sure the EDateEdit widgets use our timezones to get the
     * current time. */
    e_date_edit_set_get_time_callback (
        E_DATE_EDIT (priv->completed_date),
        (EDateEditGetTimeCallback) comp_editor_get_current_time,
        g_object_ref (editor),
        (GDestroyNotify) g_object_unref);

    /* These are created by hand, so hook the mnemonics manually */
    gtk_label_set_mnemonic_widget (
        GTK_LABEL (priv->date_completed_label),
        priv->completed_date);
    gtk_label_set_mnemonic_widget (
        GTK_LABEL (priv->url_label),
        priv->url_entry);

    /* Connect signals. The Status, Percent Complete & Date Completed
     * properties are closely related so whenever one changes we may need
     * to update the other 2. */
    g_signal_connect (
        GTK_COMBO_BOX (priv->status_combo), "changed",
        G_CALLBACK (status_changed), tdpage);

    adjustment = gtk_spin_button_get_adjustment (
        GTK_SPIN_BUTTON (priv->percent_complete));
    g_signal_connect (
        adjustment, "value_changed",
        G_CALLBACK (percent_complete_changed), tdpage);

    /* Priority */
    g_signal_connect_swapped (
        GTK_COMBO_BOX (priv->priority_combo), "changed",
        G_CALLBACK (comp_editor_page_changed), tdpage);

    /* Completed Date */
    g_signal_connect (
        priv->completed_date, "changed",
        G_CALLBACK (date_changed_cb), tdpage);
    g_signal_connect_swapped (
        priv->completed_date, "changed",
        G_CALLBACK (comp_editor_page_changed), tdpage);

    /* URL */
    g_signal_connect_swapped (
        priv->url, "changed",
        G_CALLBACK (comp_editor_page_changed), tdpage);
}

/**
 * task_details_page_construct:
 * @tdpage: An task details page.
 *
 * Constructs an task page by loading its Glade data.
 *
 * Return value: The same object as @tdpage, or NULL if the widgets could not
 * be created.
 **/
TaskDetailsPage *
task_details_page_construct (TaskDetailsPage *tdpage)
{
    TaskDetailsPagePrivate *priv = tdpage->priv;
    CompEditor *editor;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tdpage));

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

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

    init_widgets (tdpage);

    g_signal_connect_swapped (
        editor, "notify::client",
        G_CALLBACK (sensitize_widgets), tdpage);

    return tdpage;
}

/**
 * task_details_page_new:
 *
 * Creates a new task details page.
 *
 * Return value: A newly-created task details page, or NULL if the page could
 * not be created.
 **/
TaskDetailsPage *
task_details_page_new (CompEditor *editor)
{
    TaskDetailsPage *tdpage;

    tdpage = g_object_new (TYPE_TASK_DETAILS_PAGE, "editor", editor, NULL);
    if (!task_details_page_construct (tdpage)) {
        g_object_unref (tdpage);
        g_return_val_if_reached (NULL);
    }

    return tdpage;
}