path: root/calendar/gui/e-cell-date-edit-text.c

/*
 * ECellDateEditText - a subclass of ECellText used to show and edit the text
 * representation of the date, from a ECalComponentDateTime* model value.
 *
 * 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:
 *      Damon Chaplin <damon@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 */

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

#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
#include <glib/gi18n.h>
#include <libecal/libecal.h>

#include "e-cell-date-edit-text.h"

#define E_CELL_DATE_EDIT_TEXT_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_CELL_DATE_EDIT_TEXT, ECellDateEditTextPrivate))

struct _ECellDateEditTextPrivate {

    /* The timezone to display the date in. */
    icaltimezone *timezone;

    /* Whether to display in 24-hour format. */
    gboolean use_24_hour_format;
};

enum {
    PROP_0,
    PROP_TIMEZONE,
    PROP_USE_24_HOUR_FORMAT
};

G_DEFINE_TYPE (
    ECellDateEditText,
    e_cell_date_edit_text,
    E_TYPE_CELL_TEXT)

static void
cell_date_edit_text_set_property (GObject *object,
                                  guint property_id,
                                  const GValue *value,
                                  GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_TIMEZONE:
            e_cell_date_edit_text_set_timezone (
                E_CELL_DATE_EDIT_TEXT (object),
                g_value_get_pointer (value));
            return;

        case PROP_USE_24_HOUR_FORMAT:
            e_cell_date_edit_text_set_use_24_hour_format (
                E_CELL_DATE_EDIT_TEXT (object),
                g_value_get_boolean (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
cell_date_edit_text_get_property (GObject *object,
                                  guint property_id,
                                  GValue *value,
                                  GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_TIMEZONE:
            g_value_set_pointer (
                value,
                e_cell_date_edit_text_get_timezone (
                E_CELL_DATE_EDIT_TEXT (object)));
            return;

        case PROP_USE_24_HOUR_FORMAT:
            g_value_set_boolean (
                value,
                e_cell_date_edit_text_get_use_24_hour_format (
                E_CELL_DATE_EDIT_TEXT (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static gchar *
cell_date_edit_text_get_text (ECellText *cell,
                              ETableModel *model,
                              gint col,
                              gint row)
{
    ECellDateEditText *ecd = E_CELL_DATE_EDIT_TEXT (cell);
    ECellDateEditValue *dv = e_table_model_value_at (model, col, row);
    icaltimezone *timezone;
    struct tm tmp_tm;

    if (!dv)
        return g_strdup ("");

    timezone = e_cell_date_edit_text_get_timezone (ecd);

    /* Note that although the property may be in a different
     * timezone, we convert it to the current timezone to display
     * it in the table. If the user actually edits the value,
     * it will be set to the current timezone. See set_value (). */
    tmp_tm = icaltimetype_to_tm_with_zone (&dv->tt, dv->zone, timezone);

    return e_datetime_format_format_tm (
        "calendar", "table", dv->tt.is_date ?
        DTFormatKindDate : DTFormatKindDateTime, &tmp_tm);
}

static void
cell_date_edit_text_free_text (ECellText *cell,
                               gchar *text)
{
    g_free (text);
}

/* FIXME: We need to set the "transient_for" property for the dialog. */
static void
show_date_warning (ECellDateEditText *ecd)
{
    GtkWidget *dialog;
    gchar buffer[64], *format;
    time_t t;
    struct tm *tmp_tm;

    t = time (NULL);
    /* We are only using this as an example, so the timezone doesn't
     * matter. */
    tmp_tm = localtime (&t);

    if (e_cell_date_edit_text_get_use_24_hour_format (ecd))
        /* strftime format of a weekday, a date and a time, 24-hour. */
        format = _("%a %m/%d/%Y %H:%M:%S");
    else
        /* strftime format of a weekday, a date and a time, 12-hour. */
        format = _("%a %m/%d/%Y %I:%M:%S %p");

    e_utf8_strftime (buffer, sizeof (buffer), format, tmp_tm);

    dialog = gtk_message_dialog_new (
        NULL, 0,
        GTK_MESSAGE_ERROR,
        GTK_BUTTONS_OK,
        _("The date must be entered in the format: \n%s"),
        buffer);
    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);
}

static void
cell_date_edit_text_set_value (ECellText *cell,
                               ETableModel *model,
                               gint col,
                               gint row,
                               const gchar *text)
{
    ECellDateEditText *ecd = E_CELL_DATE_EDIT_TEXT (cell);
    ETimeParseStatus status;
    struct tm tmp_tm;
    ECellDateEditValue dv;
    ECellDateEditValue *value;
    gboolean is_date = TRUE;

    /* Try to parse just a date first. If the value is only a date, we
     * use a DATE value. */
    status = e_time_parse_date (text, &tmp_tm);
    if (status == E_TIME_PARSE_INVALID) {
        is_date = FALSE;
        status = e_time_parse_date_and_time (text, &tmp_tm);

        if (status == E_TIME_PARSE_INVALID) {
            show_date_warning (ecd);
            return;
        }
    }

    if (status == E_TIME_PARSE_NONE) {
        value = NULL;
    } else {
        dv.tt = icaltime_null_time ();

        dv.tt.year   = tmp_tm.tm_year + 1900;
        dv.tt.month  = tmp_tm.tm_mon + 1;
        dv.tt.day    = tmp_tm.tm_mday;
        dv.tt.hour   = tmp_tm.tm_hour;
        dv.tt.minute = tmp_tm.tm_min;
        dv.tt.second = tmp_tm.tm_sec;
        dv.tt.is_date = is_date;

        /* FIXME: We assume it is being set to the current timezone.
         * Is that OK? */
        if (is_date) {
            dv.zone = NULL;
        } else {
            dv.zone = e_cell_date_edit_text_get_timezone (ecd);
        }

        value = &dv;
    }

    e_table_model_set_value_at (model, col, row, value);
}

static void
e_cell_date_edit_text_class_init (ECellDateEditTextClass *class)
{
    GObjectClass *object_class;
    ECellTextClass *cell_text_class;

    g_type_class_add_private (class, sizeof (ECellDateEditTextPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = cell_date_edit_text_set_property;
    object_class->get_property = cell_date_edit_text_get_property;

    cell_text_class = E_CELL_TEXT_CLASS (class);
    cell_text_class->get_text  = cell_date_edit_text_get_text;
    cell_text_class->free_text = cell_date_edit_text_free_text;
    cell_text_class->set_value = cell_date_edit_text_set_value;

    g_object_class_install_property (
        object_class,
        PROP_TIMEZONE,
        g_param_spec_pointer (
            "timezone",
            "Time Zone",
            NULL,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_USE_24_HOUR_FORMAT,
        g_param_spec_boolean (
            "use-24-hour-format",
            "Use 24-Hour Format",
            NULL,
            TRUE,
            G_PARAM_READWRITE));
}

static void
e_cell_date_edit_text_init (ECellDateEditText *ecd)
{
    ecd->priv = E_CELL_DATE_EDIT_TEXT_GET_PRIVATE (ecd);

    ecd->priv->timezone = icaltimezone_get_utc_timezone ();
    ecd->priv->use_24_hour_format = TRUE;
}

/**
 * e_cell_date_edit_text_new:
 *
 * Creates a new ECell renderer that can be used to render and edit dates that
 * that come from the model.  The value returned from the model is
 * interpreted as being a ECalComponentDateTime*.
 *
 * Returns: an ECell object that can be used to render dates.
 */
ECell *
e_cell_date_edit_text_new (const gchar *fontname,
                           GtkJustification justify)
{
    ECell *cell;

    cell = g_object_new (E_TYPE_CELL_DATE_EDIT_TEXT, NULL);
    e_cell_text_construct (E_CELL_TEXT (cell), fontname, justify);

    return cell;
}

icaltimezone *
e_cell_date_edit_text_get_timezone (ECellDateEditText *ecd)
{
    g_return_val_if_fail (E_IS_CELL_DATE_EDIT_TEXT (ecd), NULL);

    return ecd->priv->timezone;
}

void
e_cell_date_edit_text_set_timezone (ECellDateEditText *ecd,
                                    icaltimezone *timezone)
{
    g_return_if_fail (E_IS_CELL_DATE_EDIT_TEXT (ecd));

    if (ecd->priv->timezone == timezone)
        return;

    ecd->priv->timezone = timezone;

    g_object_notify (G_OBJECT (ecd), "timezone");
}

gboolean
e_cell_date_edit_text_get_use_24_hour_format (ECellDateEditText *ecd)
{
    g_return_val_if_fail (E_IS_CELL_DATE_EDIT_TEXT (ecd), FALSE);

    return ecd->priv->use_24_hour_format;
}

void
e_cell_date_edit_text_set_use_24_hour_format (ECellDateEditText *ecd,
                                              gboolean use_24_hour)
{
    g_return_if_fail (E_IS_CELL_DATE_EDIT_TEXT (ecd));

    if (ecd->priv->use_24_hour_format == use_24_hour)
        return;

    ecd->priv->use_24_hour_format = use_24_hour;

    g_object_notify (G_OBJECT (ecd), "use-24-hour-format");
}

gint
e_cell_date_edit_compare_cb (gconstpointer a,
                             gconstpointer b,
                             gpointer cmp_cache)
{
    ECellDateEditValue *dv1 = (ECellDateEditValue *) a;
    ECellDateEditValue *dv2 = (ECellDateEditValue *) b;
    struct icaltimetype tt;

    /* First check if either is NULL. NULL dates sort last. */
    if (!dv1 || !dv2) {
        if (dv1 == dv2)
            return 0;
        else if (dv1)
            return -1;
        else
            return 1;
    }

    /* Copy the 2nd value and convert it to the same timezone as the first. */
    tt = dv2->tt;

    icaltimezone_convert_time (&tt, dv2->zone, dv1->zone);

    /* Now we can compare them. */
    return icaltime_compare (dv1->tt, tt);
}