eog-statusbar-date-plugin.c

/* Statusbar Date -- Shows the EXIF date in EOG's statusbar
 *
 * Copyright (C) 2008 The Free Software Foundation
 *
 * Author: Claudio Saavedra  <csaavedra@gnome.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

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

#include "eog-statusbar-date-plugin.h"

#include <gmodule.h>
#include <glib/gi18n-lib.h>

#include <libexif/exif-data.h>

#include <eog-debug.h>
#include <eog-scroll-view.h>
#include <eog-image.h>
#include <eog-thumb-view.h>
#include <eog-exif-util.h>


#define WINDOW_DATA_KEY "EogStatusbarDateWindowData"

EOG_PLUGIN_REGISTER_TYPE(EogStatusbarDatePlugin, eog_statusbar_date_plugin)

typedef struct
{
      GtkWidget *statusbar_date;
      gulong signal_id;
} WindowData;

static void
free_window_data (WindowData *data)
{
      g_return_if_fail (data != NULL);

      eog_debug (DEBUG_PLUGINS);

      g_free (data);
}

static void
statusbar_set_date (GtkStatusbar *statusbar, EogThumbView *view)
{
      EogImage *image;
      gchar *date = NULL;
      gchar time_buffer[32];
      ExifData *exif_data;

      if (eog_thumb_view_get_n_selected (view) == 0)
            return;

      image = eog_thumb_view_get_first_selected_image (view);

      gtk_statusbar_pop (statusbar, 0);

      if (!eog_image_has_data (image, EOG_IMAGE_DATA_EXIF)) {
            if (!eog_image_load (image, EOG_IMAGE_DATA_EXIF, NULL, NULL)) {
                  gtk_widget_hide (GTK_WIDGET (statusbar));
            }
      }

      exif_data = (ExifData *) eog_image_get_exif_info (image);
      if (exif_data) {
            date = eog_exif_util_format_date (
                  eog_exif_util_get_value (exif_data, EXIF_TAG_DATE_TIME_ORIGINAL, time_buffer, 32));
            exif_data_unref (exif_data);
      }

      if (date) {
            gtk_statusbar_push (statusbar, 0, date);
            gtk_widget_show (GTK_WIDGET (statusbar));
            g_free (date);
      } else {
            gtk_widget_hide (GTK_WIDGET (statusbar));
      }
}

static void
selection_changed_cb (EogThumbView *view, WindowData *data)
{
      statusbar_set_date (GTK_STATUSBAR (data->statusbar_date), view);
}
static void
eog_statusbar_date_plugin_init (EogStatusbarDatePlugin *plugin)
{
      eog_debug_message (DEBUG_PLUGINS, "EogStatusbarDatePlugin initializing");
}

static void
eog_statusbar_date_plugin_finalize (GObject *object)
{
      eog_debug_message (DEBUG_PLUGINS, "EogStatusbarDatePlugin finalizing");

      G_OBJECT_CLASS (eog_statusbar_date_plugin_parent_class)->finalize (object);
}

static void
impl_activate (EogPlugin *plugin,
             EogWindow *window)
{
      GtkWidget *statusbar = eog_window_get_statusbar (window);
      GtkWidget *thumbview = eog_window_get_thumb_view (window);
      WindowData *data;

      eog_debug (DEBUG_PLUGINS);

      data = g_new (WindowData, 1);
      data->statusbar_date = gtk_statusbar_new ();
      gtk_statusbar_set_has_resize_grip (GTK_STATUSBAR (data->statusbar_date),
                                 FALSE);
      gtk_widget_set_size_request (data->statusbar_date, 200, 10);
      gtk_box_pack_end (GTK_BOX (statusbar),
                    data->statusbar_date,
                    FALSE, FALSE, 0);

      data->signal_id = g_signal_connect_after (G_OBJECT (thumbview), "selection_changed",
                                      G_CALLBACK (selection_changed_cb), data);

      statusbar_set_date (GTK_STATUSBAR (data->statusbar_date),
                      EOG_THUMB_VIEW (eog_window_get_thumb_view (window)));

      g_object_set_data_full (G_OBJECT (window),
                        WINDOW_DATA_KEY,
                        data,
                        (GDestroyNotify) free_window_data);
}

static void
impl_deactivate   (EogPlugin *plugin,
             EogWindow *window)
{
      GtkWidget *statusbar = eog_window_get_statusbar (window);
      GtkWidget *view = eog_window_get_thumb_view (window);
      WindowData *data;

      data = (WindowData *) g_object_get_data (G_OBJECT (window),
                                     WINDOW_DATA_KEY);

      g_signal_handler_disconnect (view, data->signal_id);

      gtk_container_remove (GTK_CONTAINER (statusbar), data->statusbar_date);

      g_object_set_data (G_OBJECT (window),
                     WINDOW_DATA_KEY,
                     NULL);
}

static void
impl_update_ui (EogPlugin *plugin,
            EogWindow *window)
{
}

static void
eog_statusbar_date_plugin_class_init (EogStatusbarDatePluginClass *klass)
{
      GObjectClass *object_class = G_OBJECT_CLASS (klass);
      EogPluginClass *plugin_class = EOG_PLUGIN_CLASS (klass);

      object_class->finalize = eog_statusbar_date_plugin_finalize;

      plugin_class->activate = impl_activate;
      plugin_class->deactivate = impl_deactivate;
      plugin_class->update_ui = impl_update_ui;
}