image_list.c 44 KB
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/*
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 *  Copyright (c) Stephan Arts 2009-2011 <stephan@xfce.org>
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 *
 *  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.
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 *
 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Library 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.
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 *
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 *  Sorting-algorithm taken from the thunar filemanager. 
 *    Copyright (c) Benedict Meurer <benny@xfce.org>
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 */

#include <config.h>

#include <gtk/gtk.h>
#include <gtk/gtkmarshal.h>

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#include <stdlib.h>
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#include <string.h>

#include <libexif/exif-data.h>

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#include "util.h"
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#include "file.h"
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#include "image_list.h"
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#include "thumbnailer.h"
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#include "settings.h"
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static void
rstto_image_list_tree_model_init (GtkTreeModelIface *iface);
static void
rstto_image_list_tree_sortable_init(GtkTreeSortableIface *iface);

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static void 
rstto_image_list_init(RsttoImageList *);
static void
rstto_image_list_class_init(RsttoImageListClass *);
static void
rstto_image_list_dispose(GObject *object);

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static void
cb_file_monitor_changed (
        GFileMonitor      *monitor,
        GFile             *file,
        GFile             *other_file,
        GFileMonitorEvent  event_type,
        gpointer           user_data );

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static void 
rstto_image_list_iter_init(RsttoImageListIter *);
static void
rstto_image_list_iter_class_init(RsttoImageListIterClass *);
static void
rstto_image_list_iter_dispose(GObject *object);

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static void
cb_rstto_wrap_images_changed (
        GObject *settings,
        GParamSpec *pspec,
        gpointer user_data);

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static void
cb_rstto_thumbnailer_ready(
        RsttoThumbnailer *thumbnailer,
        RsttoFile *file,
        gpointer user_data);

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static void
rstto_image_list_monitor_dir (
        RsttoImageList *image_list,
        GFile *dir );

static void
rstto_image_list_remove_all (
        RsttoImageList *image_list);

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static gboolean
iter_next (
        RsttoImageListIter *iter,
        gboolean sticky);
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static gboolean
iter_previous (
        RsttoImageListIter *iter,
        gboolean sticky);
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static void 
iter_set_position (
        RsttoImageListIter *iter,
        gint pos,
        gboolean sticky);

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/***************************************/
/*  Begin TreeModelIface Functions     */
/***************************************/

static GtkTreeModelFlags
image_list_model_get_flags ( GtkTreeModel *tree_model );

static gint
image_list_model_get_n_columns ( GtkTreeModel *tree_model );

static GType
image_list_model_get_column_type (
        GtkTreeModel *tree_model,
        gint index_ );

static gboolean
image_list_model_get_iter (
        GtkTreeModel *tree_model,
        GtkTreeIter *iter,
        GtkTreePath *path );

static GtkTreePath *
image_list_model_get_path (
        GtkTreeModel *tree_model,
        GtkTreeIter *iter );

static void 
image_list_model_get_value (
        GtkTreeModel *tree_model,
        GtkTreeIter *iter,
        gint column,
        GValue *value );

static gboolean
image_list_model_iter_children (
        GtkTreeModel *tree_model,
        GtkTreeIter *iter,
        GtkTreeIter *parent );

static gboolean
image_list_model_iter_has_child (
        GtkTreeModel *tree_model,
        GtkTreeIter *iter );

static gboolean
image_list_model_iter_parent (
        GtkTreeModel *tree_model,
        GtkTreeIter *iter,
        GtkTreeIter *child );

static gint
image_list_model_iter_n_children (
        GtkTreeModel *tree_model,
        GtkTreeIter *iter );

static gboolean 
image_list_model_iter_nth_child (
        GtkTreeModel *tree_model,
        GtkTreeIter *iter,
        GtkTreeIter *parent,
        gint n );

static gboolean
image_list_model_iter_next (
        GtkTreeModel *tree_model,
        GtkTreeIter *iter );

/***************************************/
/*  End TreeModelIface Functions       */
/***************************************/

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static RsttoImageListIter * rstto_image_list_iter_new ();

static gint
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cb_rstto_image_list_image_name_compare_func (RsttoFile *a, RsttoFile *b);
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static gint
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cb_rstto_image_list_exif_date_compare_func (RsttoFile *a, RsttoFile *b);
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static GObjectClass *parent_class = NULL;
static GObjectClass *iter_parent_class = NULL;

enum
{
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    RSTTO_IMAGE_LIST_SIGNAL_REMOVE_IMAGE = 0,
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    RSTTO_IMAGE_LIST_SIGNAL_REMOVE_ALL,
    RSTTO_IMAGE_LIST_SIGNAL_COUNT
};

enum
{
    RSTTO_IMAGE_LIST_ITER_SIGNAL_CHANGED = 0,
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    RSTTO_IMAGE_LIST_ITER_SIGNAL_PREPARE_CHANGE,
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    RSTTO_IMAGE_LIST_ITER_SIGNAL_COUNT
};

struct _RsttoImageListIterPriv
{
    RsttoImageList *image_list;
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    RsttoFile      *r_file;
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    /* This is set if the iter-position is chosen by the user */
    gboolean        sticky; 
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};

struct _RsttoImageListPriv
{
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    gint           stamp;
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    GFileMonitor  *dir_monitor;
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    gint           directory_loader;
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    RsttoSettings *settings;
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    RsttoThumbnailer *thumbnailer;
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    GtkFileFilter *filter;
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    GList        *image_monitors;
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    GList        *images;
    gint          n_images;

    GSList       *iterators;
    GCompareFunc  cb_rstto_image_list_compare_func;
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    gboolean      wrap_images;
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};

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typedef struct _RsttoFileLoader RsttoFileLoader;

struct _RsttoFileLoader
{
    GFile           *dir;
    RsttoImageList  *image_list;
    GFileEnumerator *file_enum;

    guint            n_files;
    RsttoFile      **files;
};

static gboolean
cb_rstto_read_file ( gpointer user_data );

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static gint rstto_image_list_signals[RSTTO_IMAGE_LIST_SIGNAL_COUNT];
static gint rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_COUNT];

GType
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rstto_image_list_get_type (void)
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{
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    static const GInterfaceInfo tree_model_info =
    {
        (GInterfaceInitFunc) rstto_image_list_tree_model_init,
            NULL,
            NULL
    };
    static const GInterfaceInfo tree_sort_info =
    {
        (GInterfaceInitFunc) rstto_image_list_tree_sortable_init,
            NULL,
            NULL
    };
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    static GType rstto_image_list_type = 0;

    if (!rstto_image_list_type)
    {
        static const GTypeInfo rstto_image_list_info = 
        {
            sizeof (RsttoImageListClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) rstto_image_list_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,
            sizeof (RsttoImageList),
            0,
            (GInstanceInitFunc) rstto_image_list_init,
            NULL
        };

        rstto_image_list_type = g_type_register_static (G_TYPE_OBJECT, "RsttoImageList", &rstto_image_list_info, 0);
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        g_type_add_interface_static (rstto_image_list_type, GTK_TYPE_TREE_MODEL, &tree_model_info);

        g_type_add_interface_static (rstto_image_list_type, GTK_TYPE_TREE_SORTABLE, &tree_sort_info);
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    }
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    return rstto_image_list_type;
}

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static void
rstto_image_list_tree_model_init (GtkTreeModelIface *iface)
{
    iface->get_flags       = image_list_model_get_flags;
    iface->get_n_columns   = image_list_model_get_n_columns;
    iface->get_column_type = image_list_model_get_column_type;
    iface->get_iter        = image_list_model_get_iter;
    iface->get_path        = image_list_model_get_path;
    iface->get_value       = image_list_model_get_value;
    iface->iter_children   = image_list_model_iter_children;
    iface->iter_has_child  = image_list_model_iter_has_child;
    iface->iter_n_children = image_list_model_iter_n_children;
    iface->iter_nth_child  = image_list_model_iter_nth_child;
    iface->iter_parent     = image_list_model_iter_parent;
    iface->iter_next       = image_list_model_iter_next;
}

static void
rstto_image_list_tree_sortable_init(GtkTreeSortableIface *iface)
{
#if 0 
    iface->get_sort_column_id    = sq_archive_store_get_sort_column_id;
    iface->set_sort_column_id    = sq_archive_store_set_sort_column_id;
    iface->set_sort_func         = sq_archive_store_set_sort_func;            /*NOT SUPPORTED*/
    iface->set_default_sort_func = sq_archive_store_set_default_sort_func;    /*NOT SUPPORTED*/
    iface->has_default_sort_func = sq_archive_store_has_default_sort_func;
#endif 
}

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static void
rstto_image_list_init(RsttoImageList *image_list)
{
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    image_list->priv = g_new0 (RsttoImageListPriv, 1);
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    image_list->priv->stamp = g_random_int();
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    image_list->priv->settings = rstto_settings_new ();
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    image_list->priv->thumbnailer = rstto_thumbnailer_new();
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    image_list->priv->filter = gtk_file_filter_new ();
    g_object_ref_sink (image_list->priv->filter);
    gtk_file_filter_add_pixbuf_formats (image_list->priv->filter);
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    image_list->priv->cb_rstto_image_list_compare_func = (GCompareFunc)cb_rstto_image_list_image_name_compare_func;
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    image_list->priv->wrap_images = rstto_settings_get_boolean_property (
            image_list->priv->settings,
            "wrap-images");

    g_signal_connect (
            G_OBJECT(image_list->priv->settings),
            "notify::wrap-images",
            G_CALLBACK (cb_rstto_wrap_images_changed),
            image_list);

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    g_signal_connect (
            G_OBJECT(image_list->priv->thumbnailer),
            "ready",
            G_CALLBACK (cb_rstto_thumbnailer_ready),
            image_list);

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}

static void
rstto_image_list_class_init(RsttoImageListClass *nav_class)
{
    GObjectClass *object_class = G_OBJECT_CLASS(nav_class);

    parent_class = g_type_class_peek_parent(nav_class);

    object_class->dispose = rstto_image_list_dispose;

    rstto_image_list_signals[RSTTO_IMAGE_LIST_SIGNAL_REMOVE_IMAGE] = g_signal_new("remove-image",
            G_TYPE_FROM_CLASS(nav_class),
            G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
            0,
            NULL,
            NULL,
            g_cclosure_marshal_VOID__OBJECT,
            G_TYPE_NONE,
            1,
            G_TYPE_OBJECT,
            NULL);

    rstto_image_list_signals[RSTTO_IMAGE_LIST_SIGNAL_REMOVE_ALL] = g_signal_new("remove-all",
            G_TYPE_FROM_CLASS(nav_class),
            G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
            0,
            NULL,
            NULL,
            g_cclosure_marshal_VOID__VOID,
            G_TYPE_NONE,
            0,
            NULL);
}

static void
rstto_image_list_dispose(GObject *object)
{
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    RsttoImageList *image_list = RSTTO_IMAGE_LIST(object);
    if (NULL != image_list->priv)
    {
        if (image_list->priv->settings)
        {
            g_object_unref (image_list->priv->settings);
            image_list->priv->settings = NULL;
        }
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        if (image_list->priv->thumbnailer)
        {
            g_object_unref (image_list->priv->thumbnailer);
            image_list->priv->thumbnailer = NULL;
        }

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        if (image_list->priv->filter)
        {
            g_object_unref (image_list->priv->filter);
            image_list->priv->filter= NULL;
        }
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        g_free (image_list->priv);
        image_list->priv = NULL;
    }
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}

RsttoImageList *
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rstto_image_list_new (void)
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{
    RsttoImageList *image_list;

    image_list = g_object_new(RSTTO_TYPE_IMAGE_LIST, NULL);

    return image_list;
}

gboolean
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rstto_image_list_add_file (
        RsttoImageList *image_list,
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        RsttoFile *r_file,
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        GError **error )
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{
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    GtkFileFilterInfo filter_info;
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    GList *image_iter = g_list_find (image_list->priv->images, r_file);
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    GSList *iter = image_list->priv->iterators;
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    gint i = 0;
    GtkTreePath *path = NULL;
    GtkTreeIter t_iter;
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    GFileMonitor *monitor = NULL;
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    g_return_val_if_fail ( NULL != r_file , FALSE);
    g_return_val_if_fail ( RSTTO_IS_FILE (r_file) , FALSE);
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    if (!image_iter)
    {
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        if (r_file)
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        {
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            filter_info.contains =  GTK_FILE_FILTER_MIME_TYPE | GTK_FILE_FILTER_URI;
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            filter_info.uri = rstto_file_get_uri (r_file);
            filter_info.mime_type = rstto_file_get_content_type (r_file);
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            if ( TRUE == gtk_file_filter_filter (image_list->priv->filter, &filter_info))
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            {
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                g_object_ref (G_OBJECT (r_file));
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                image_list->priv->images = g_list_insert_sorted (
                        image_list->priv->images,
                        r_file,
                        rstto_image_list_get_compare_func (image_list));
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                image_list->priv->n_images++;
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                if (image_list->priv->dir_monitor == NULL)
                {
                    monitor = g_file_monitor_file (
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                            rstto_file_get_file (r_file),
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                            G_FILE_MONITOR_NONE,
                            NULL,
                            NULL);
                    g_signal_connect (
                            G_OBJECT(monitor),
                            "changed",
                            G_CALLBACK (cb_file_monitor_changed),
                            image_list);
                    image_list->priv->image_monitors = g_list_prepend (
                            image_list->priv->image_monitors, 
                            monitor);
                }
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                i = g_list_index (image_list->priv->images, r_file);
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                path = gtk_tree_path_new();
                gtk_tree_path_append_index (path, i);
                t_iter.stamp = image_list->priv->stamp;
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                t_iter.user_data = r_file;
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                t_iter.user_data3 = GINT_TO_POINTER(i);

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                gtk_tree_model_row_inserted (
                        GTK_TREE_MODEL(image_list),
                        path,
                        &t_iter);
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                /** TODO: update all iterators */
                while (iter)
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                {
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                    if (FALSE == RSTTO_IMAGE_LIST_ITER(iter->data)->priv->sticky)
                    {
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                        rstto_image_list_iter_find_file (iter->data, r_file);
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                    }
                    iter = g_slist_next (iter);
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                }
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                return TRUE;
            }
            else
            {
                return FALSE;
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            }
        }
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        return FALSE;
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    }
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    return TRUE;
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}

gint
rstto_image_list_get_n_images (RsttoImageList *image_list)
{
    return g_list_length (image_list->priv->images);
}

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/**
 * rstto_image_list_get_iter:
 * @image_list:
 *
 * TODO: track iterators
 *
 * return iter;
 */
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RsttoImageListIter *
rstto_image_list_get_iter (RsttoImageList *image_list)
{
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    RsttoFile *r_file = NULL;
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    RsttoImageListIter *iter = NULL;
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    if (image_list->priv->images)
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    {
        r_file = image_list->priv->images->data;
    }
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    iter = rstto_image_list_iter_new (image_list, r_file);
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    image_list->priv->iterators = g_slist_prepend (image_list->priv->iterators, iter);

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    return iter;
}


void
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rstto_image_list_remove_file (
        RsttoImageList *image_list,
        RsttoFile *r_file)
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{
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    GSList *iter = NULL;
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    RsttoFile *r_file_a = NULL;
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    GtkTreePath *path_ = NULL;
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    gint index_ = g_list_index (image_list->priv->images, r_file);
    gint n_images = rstto_image_list_get_n_images (image_list);
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    if (index_ != -1)
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    {
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        iter = image_list->priv->iterators;
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        while (iter)
        {
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            if (rstto_file_equal(rstto_image_list_iter_get_file (iter->data), r_file))
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            {
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                if (rstto_image_list_iter_get_position (iter->data) == n_images -1)
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                {
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                    iter_previous (iter->data, FALSE);
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                }
                else
                {
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                    iter_next (iter->data, FALSE);
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                }
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                /* If the image is still the same, 
                 * it's a single item list,
                 * and we should force the image in this iter to NULL
                 */
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                if (rstto_file_equal (
                        rstto_image_list_iter_get_file (iter->data),
                        r_file ) )
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                {
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                    ((RsttoImageListIter *)(iter->data))->priv->r_file = NULL;
                    g_signal_emit (
                            G_OBJECT (iter->data),
                            rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_CHANGED],
                            0,
                            NULL);
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                }
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            }
            iter = g_slist_next (iter);
        }
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        path_ = gtk_tree_path_new();
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        gtk_tree_path_append_index(path_,index_);
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        gtk_tree_model_row_deleted(GTK_TREE_MODEL(image_list), path_);

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        image_list->priv->images = g_list_remove (image_list->priv->images, r_file);
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        iter = image_list->priv->iterators;
        while (iter)
        {
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            r_file_a = rstto_image_list_iter_get_file(iter->data);
            if (NULL != r_file_a)
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            {
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                if (rstto_file_equal(r_file_a, r_file))
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                {
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                    iter_next (iter->data, FALSE);
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                }
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            }
            iter = g_slist_next (iter);
        }

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        g_signal_emit (
                G_OBJECT (image_list),
                rstto_image_list_signals[RSTTO_IMAGE_LIST_SIGNAL_REMOVE_IMAGE],
                0,
                r_file,
                NULL);
        g_object_unref (r_file);
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    }
}

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static void
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rstto_image_list_remove_all (RsttoImageList *image_list)
{
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    GSList *iter = NULL;
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    GList *image_iter = image_list->priv->images;
    GtkTreePath *path_ = NULL;
    gint i = g_list_length (image_iter);

    while (image_iter)
    {
        i--;
        path_ = gtk_tree_path_new();
        gtk_tree_path_append_index(path_, i);

        gtk_tree_model_row_deleted(GTK_TREE_MODEL(image_list), path_);

        
        image_iter = g_list_next (image_iter);     
    }

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    g_list_foreach (image_list->priv->image_monitors, (GFunc)g_object_unref, NULL);
    g_list_free (image_list->priv->image_monitors);
    image_list->priv->image_monitors = NULL;

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    g_list_foreach (image_list->priv->images, (GFunc)g_object_unref, NULL);
    g_list_free (image_list->priv->images);
    image_list->priv->images = NULL;
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    iter = image_list->priv->iterators;
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    while (iter)
    {
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        iter_set_position (iter->data, -1, FALSE);
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        iter = g_slist_next (iter);
    }
    g_signal_emit (G_OBJECT (image_list), rstto_image_list_signals[RSTTO_IMAGE_LIST_SIGNAL_REMOVE_ALL], 0, NULL);
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}

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gboolean
rstto_image_list_set_directory (
        RsttoImageList *image_list,
        GFile *dir,
        GError **error )
{
    /* Declare variables */
    GFileEnumerator *file_enumerator = NULL;
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    RsttoFileLoader *loader = NULL;
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    /* Source code block */
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    if (image_list->priv->directory_loader != 0)
    {
        g_source_remove (image_list->priv->directory_loader);
        image_list->priv->directory_loader = 0;
    }

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    rstto_image_list_remove_all (image_list);

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    rstto_image_list_monitor_dir ( 
            image_list,
            dir );

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    /* Allow all images to be removed by providing NULL to dir */
    if ( NULL != dir )
    {
        file_enumerator = g_file_enumerate_children (dir, "standard::*", 0, NULL, NULL);

        if (NULL != file_enumerator)
        {
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            g_object_ref (dir);

            loader = g_new0 (RsttoFileLoader, 1);
            loader->dir = dir;
            loader->file_enum = file_enumerator;
            loader->image_list = image_list;

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            image_list->priv->directory_loader = g_idle_add ( (GSourceFunc) cb_rstto_read_file, loader );
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        }
    }

    return TRUE;
}

static gboolean
cb_rstto_read_file ( gpointer user_data )
{
    RsttoFileLoader *loader = user_data;
    GFileInfo       *file_info;
    const gchar     *content_type;
    const gchar     *filename;
    RsttoFile      **files;
    GFile           *child_file;
    guint            i;
    GSList          *iter;

    /* Check the inputs */
    g_return_val_if_fail ( NULL != loader, FALSE );
    g_return_val_if_fail ( NULL != loader->file_enum, FALSE );

    file_info = g_file_enumerator_next_file (
            loader->file_enum,
            NULL,
            NULL );
    if ( NULL != file_info )
    {
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        /* Allow for 'progressive' loading */
        if (loader->n_files == 100)
        {
            for (i = 0; i < loader->n_files; ++i)
            {
                rstto_image_list_add_file (
                        loader->image_list,
                        loader->files[i],
                        NULL);

                g_object_unref (loader->files[i]);
            }

            iter = loader->image_list->priv->iterators;
            while (iter)
            {
                g_signal_emit (G_OBJECT (iter->data), rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_CHANGED], 0, NULL);
                iter = g_slist_next (iter);
            }

            g_free (loader->files);
            loader->files = NULL;
            loader->n_files = 0;
        }

        /* Add file to the list */
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        content_type  = g_file_info_get_content_type (file_info);
        if (strncmp (content_type, "image/", 6) == 0)
        {
            filename = g_file_info_get_name (file_info);
            child_file = g_file_get_child (loader->dir, filename);
            files = g_new0 ( RsttoFile *, loader->n_files+1);
            files[0] = rstto_file_new (child_file);

            for (i = 0; i < loader->n_files; ++i)
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            {
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                files[i+1] = loader->files[i];
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            }
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            if ( NULL != loader->files )
            {
                g_free (loader->files);
            }
            loader->files = files;
            loader->n_files++;
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        }
    }
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    else
    {
        for (i = 0; i < loader->n_files; ++i)
        {
            rstto_image_list_add_file (
                    loader->image_list,
                    loader->files[i],
                    NULL);
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            g_object_unref (loader->files[i]);
        }

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        /* This is a hack, use a closure */
        if (loader->image_list->priv->directory_loader != 0)
        {
            g_source_remove (loader->image_list->priv->directory_loader);
            loader->image_list->priv->directory_loader = 0;
        }

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        iter = loader->image_list->priv->iterators;
        while (iter)
        {
            g_signal_emit (G_OBJECT (iter->data), rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_CHANGED], 0, NULL);
            iter = g_slist_next (iter);
        }

        return FALSE;
    }
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    return TRUE;
}

static void
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rstto_image_list_monitor_dir (
        RsttoImageList *image_list,
        GFile *dir )
{
    GFileMonitor *monitor = NULL;

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

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    /* Allow a monitor to be removed by providing NULL to dir */
    if ( NULL != dir )
    {
        monitor = g_file_monitor_directory (
                dir,
                G_FILE_MONITOR_NONE,
                NULL,
                NULL);

        g_signal_connect (
                G_OBJECT(monitor),
                "changed",
                G_CALLBACK (cb_file_monitor_changed),
                image_list);
    }
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    if (image_list->priv->image_monitors)
    {
        g_list_foreach (image_list->priv->image_monitors, (GFunc)g_object_unref, NULL);
        g_list_free (image_list->priv->image_monitors);
        image_list->priv->image_monitors = NULL;
    }

    image_list->priv->dir_monitor = monitor;
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}

static void
cb_file_monitor_changed (
        GFileMonitor      *monitor,
        GFile             *file,
        GFile             *other_file,
        GFileMonitorEvent  event_type,
        gpointer           user_data )
{
    RsttoImageList *image_list = RSTTO_IMAGE_LIST (user_data);
    RsttoFile *r_file = rstto_file_new (file);

    switch ( event_type )
    {
        case G_FILE_MONITOR_EVENT_DELETED:
            rstto_image_list_remove_file ( image_list, r_file );
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            if (image_list->priv->dir_monitor == NULL)
            {
                image_list->priv->image_monitors = g_list_remove (
                        image_list->priv->image_monitors,
                        monitor);   
                g_object_unref (monitor);
                monitor = NULL;
            }
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            break;
        case G_FILE_MONITOR_EVENT_CREATED:
            rstto_image_list_add_file (image_list, r_file, NULL);
            break;
        case G_FILE_MONITOR_EVENT_MOVED:
            rstto_image_list_remove_file ( image_list, r_file );
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            /* Remove our reference, reusing pointer */
            g_object_unref (r_file);

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            r_file = rstto_file_new (other_file);
            rstto_image_list_add_file (image_list, r_file, NULL);
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            if (image_list->priv->dir_monitor == NULL)
            {
                image_list->priv->image_monitors = g_list_remove (
                        image_list->priv->image_monitors,
                        monitor);   
                g_object_unref (monitor);
                monitor = g_file_monitor_file (
                        other_file,
                        G_FILE_MONITOR_NONE,
                        NULL,
                        NULL);
                g_signal_connect (
                        G_OBJECT(monitor),
                        "changed",
                        G_CALLBACK (cb_file_monitor_changed),
                        image_list);
                image_list->priv->image_monitors = g_list_prepend (
                        image_list->priv->image_monitors, 
                        monitor);
            }
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            break;
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        case G_FILE_MONITOR_EVENT_CHANGED:
            rstto_file_changed (r_file);
            break;
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        default:
            break;
    }

    if ( NULL != r_file )
    {
        g_object_unref (r_file);
    }
}

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GType
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rstto_image_list_iter_get_type (void)
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{
    static GType rstto_image_list_iter_type = 0;

    if (!rstto_image_list_iter_type)
    {
        static const GTypeInfo rstto_image_list_iter_info = 
        {
            sizeof (RsttoImageListIterClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) rstto_image_list_iter_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,
            sizeof (RsttoImageListIter),
            0,
            (GInstanceInitFunc) rstto_image_list_iter_init,
            NULL
        };

        rstto_image_list_iter_type = g_type_register_static (G_TYPE_OBJECT, "RsttoImageListIter", &rstto_image_list_iter_info, 0);
    }
    return rstto_image_list_iter_type;
}

static void
rstto_image_list_iter_init (RsttoImageListIter *iter)
{
    iter->priv = g_new0 (RsttoImageListIterPriv, 1);
}

static void
rstto_image_list_iter_class_init(RsttoImageListIterClass *iter_class)
{
    GObjectClass *object_class = G_OBJECT_CLASS(iter_class);

    iter_parent_class = g_type_class_peek_parent(iter_class);

    object_class->dispose = rstto_image_list_iter_dispose;

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    rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_PREPARE_CHANGE] = g_signal_new("prepare-change",
            G_TYPE_FROM_CLASS(iter_class),
            G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
            0,
            NULL,
            NULL,
            g_cclosure_marshal_VOID__VOID,
            G_TYPE_NONE,
            0,
            NULL);

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    rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_CHANGED] = g_signal_new("changed",
            G_TYPE_FROM_CLASS(iter_class),
            G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
            0,
            NULL,
            NULL,
            g_cclosure_marshal_VOID__VOID,
            G_TYPE_NONE,
            0,
            NULL);
}

static void
rstto_image_list_iter_dispose (GObject *object)
{
    RsttoImageListIter *iter = RSTTO_IMAGE_LIST_ITER(object);
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    if (iter->priv->r_file)
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    {
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        iter->priv->r_file = NULL;
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    }
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    if (iter->priv->image_list)
    {
        iter->priv->image_list->priv->iterators = g_slist_remove (iter->priv->image_list->priv->iterators, iter);
        iter->priv->image_list= NULL;
    }
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}

static RsttoImageListIter *
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rstto_image_list_iter_new (
        RsttoImageList *nav,
        RsttoFile *r_file)
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{
    RsttoImageListIter *iter;

    iter = g_object_new(RSTTO_TYPE_IMAGE_LIST_ITER, NULL);
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    iter->priv->r_file = r_file;
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    iter->priv->image_list = nav;

    return iter;
}

gboolean
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rstto_image_list_iter_find_file (
        RsttoImageListIter *iter,
        RsttoFile *r_file)
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{
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    gint pos = g_list_index (iter->priv->image_list->priv->images, r_file);

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    if (pos > -1)
    {
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        g_signal_emit (
                G_OBJECT (iter),
                rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_PREPARE_CHANGE],
                0,
                NULL);
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        if (iter->priv->r_file)
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        {
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            iter->priv->r_file = NULL;
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        }
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        iter->priv->r_file = r_file;
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        iter->priv->sticky = TRUE;
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        g_signal_emit (
                G_OBJECT (iter),
                rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_CHANGED],
                0,
                NULL);
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        return TRUE;
    }
    return FALSE;
}

gint
rstto_image_list_iter_get_position (RsttoImageListIter *iter)
{
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    if ( NULL == iter->priv->r_file )
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    {
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        return -1;
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    }
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    return g_list_index (iter->priv->image_list->priv->images, iter->priv->r_file);
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}

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RsttoFile *
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rstto_image_list_iter_get_file (RsttoImageListIter *iter)
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{
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    return iter->priv->r_file;
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}

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static void
iter_set_position (
        RsttoImageListIter *iter,
        gint pos,
        gboolean sticky )
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{
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    g_signal_emit (
            G_OBJECT (iter),
            rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_PREPARE_CHANGE],
            0,
            NULL);
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    if (iter->priv->r_file)
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    {
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        iter->priv->r_file = NULL;
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    }

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    if (pos >= 0)
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    {
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        iter->priv->r_file = g_list_nth_data (iter->priv->image_list->priv->images, pos); 
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    }
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    g_signal_emit (
            G_OBJECT (iter),
            rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_CHANGED],
            0,
            NULL);
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}

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void
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rstto_image_list_iter_set_position (
        RsttoImageListIter *iter,
        gint pos)
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{
    iter_set_position ( iter, pos, TRUE );
}

static gboolean
iter_next (
        RsttoImageListIter *iter,
        gboolean sticky)
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{
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    GList *position = NULL;
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    RsttoImageList *image_list = iter->priv->image_list;
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    RsttoFile *r_file = iter->priv->r_file;
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    gboolean ret_val = FALSE;
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    g_signal_emit (
            G_OBJECT (iter),
            rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_PREPARE_CHANGE],
            0,
            NULL);
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    if (r_file)
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    {
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        position = g_list_find (iter->priv->image_list->priv->images, r_file);
        iter->priv->r_file = NULL;
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    }

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    iter->priv->sticky = sticky;

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    position = g_list_next (position);
    if (position)
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    {
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        iter->priv->r_file = position->data; 
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        /* We could move forward, set ret_val to TRUE */
        ret_val = TRUE;
    }
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    else
    {
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        if (TRUE == image_list->priv->wrap_images)
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        {
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            position = g_list_first (iter->priv->image_list->priv->images);
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            /* We could move forward, wrapped back to the start of the
             * list, set ret_val to TRUE
             */
            ret_val = TRUE;
        }
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        else
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        {
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            position = g_list_last (iter->priv->image_list->priv->images);
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        }
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        if (position)
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        {
            iter->priv->r_file = position->data; 
        }
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        else
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        {
            iter->priv->r_file = NULL;
        }
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    }

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    if (r_file != iter->priv->r_file)
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    {
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        g_signal_emit (
                G_OBJECT (iter),
                rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_CHANGED],
                0,
                NULL);
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    }
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    return ret_val;
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}

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gboolean
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rstto_image_list_iter_next (RsttoImageListIter *iter)
{
    return iter_next (iter, TRUE);
}

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gboolean
rstto_image_list_iter_has_next (RsttoImageListIter *iter)
{
    RsttoImageList *image_list = iter->priv->image_list;

    if (image_list->priv->wrap_images)
    {
        return TRUE;
    }
    else
    {
        if (rstto_image_list_iter_get_position (iter) ==
            (rstto_image_list_get_n_images (image_list) -1))
        {
            return FALSE;
        }
        else
        {
            return TRUE;
        }
    }
}

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static gboolean
iter_previous (
        RsttoImageListIter *iter,
        gboolean sticky)
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{
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    GList *position = NULL;
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    RsttoImageList *image_list = iter->priv->image_list;
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    RsttoFile *r_file = iter->priv->r_file;
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    gboolean ret_val = FALSE;
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    g_signal_emit (
            G_OBJECT (iter),
            rstto_image_list_iter_signals[RSTTO_IMAGE_LIST_ITER_SIGNAL_PREPARE_CHANGE],
            0,
            NULL);
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    if (iter->priv->r_file)
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    {
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        position = g_list_find (iter->priv->image_list->priv->images, iter->priv->r_file);
        iter->priv->r_file = NULL;
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    }

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    iter->priv->sticky = sticky;

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    position = g_list_previous (position);
    if (position)
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    {
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        iter->priv->r_file = position->data; 
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    }
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    else
    {
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        if (TRUE == image_list->priv->wrap_images)
        {
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            position = g_list_last (iter->priv->image_list->priv->images);
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        }
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        else
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        {
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            position = g_list_first (iter->priv->image_list->priv->images);