path: root/e-util/gal-view-instance.c

/*
 *
 * 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.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include "gal-view-instance.h"

#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>

#include <gtk/gtk.h>
#include <libxml/parser.h>
#include <glib/gstdio.h>
#include <glib/gi18n.h>

#include <libedataserver/libedataserver.h>

#include "e-unicode.h"
#include "e-xml-utils.h"
#include "gal-view-instance-save-as-dialog.h"

G_DEFINE_TYPE (GalViewInstance, gal_view_instance, G_TYPE_OBJECT)

#define d(x)

enum {
    DISPLAY_VIEW,
    CHANGED,
    LOADED,
    LAST_SIGNAL
};

static guint gal_view_instance_signals[LAST_SIGNAL] = { 0, };

static void
gal_view_instance_changed (GalViewInstance *instance)
{
    g_return_if_fail (instance != NULL);
    g_return_if_fail (GAL_IS_VIEW_INSTANCE (instance));

    g_signal_emit (
        instance,
        gal_view_instance_signals[CHANGED], 0);
}

static void
gal_view_instance_display_view (GalViewInstance *instance,
                                GalView *view)
{
    g_return_if_fail (instance != NULL);
    g_return_if_fail (GAL_IS_VIEW_INSTANCE (instance));

    g_signal_emit (
        instance,
        gal_view_instance_signals[DISPLAY_VIEW], 0,
        view);
}

static void
save_current_view (GalViewInstance *instance)
{
    xmlDoc *doc;
    xmlNode *root;

    doc = xmlNewDoc ((const guchar *)"1.0");
    root = xmlNewNode (NULL, (const guchar *)"GalViewCurrentView");
    xmlDocSetRootElement (doc, root);

    if (instance->current_id)
        e_xml_set_string_prop_by_name (root, (const guchar *)"current_view", instance->current_id);
    if (instance->current_type)
        e_xml_set_string_prop_by_name (root, (const guchar *)"current_view_type", instance->current_type);

    if (e_xml_save_file (instance->current_view_filename, doc) == -1)
        g_warning ("Unable to save view to %s - %s", instance->current_view_filename, g_strerror (errno));
    xmlFreeDoc (doc);
}

static void
view_changed (GalView *view,
              GalViewInstance *instance)
{
    if (instance->current_id != NULL) {
        g_free (instance->current_id);
        instance->current_id = NULL;
        save_current_view (instance);
        gal_view_instance_changed (instance);
    }

    gal_view_save (view, instance->custom_filename);
}

static void
disconnect_view (GalViewInstance *instance)
{
    if (instance->current_view) {
        if (instance->view_changed_id) {
            g_signal_handler_disconnect (
                instance->current_view,
                instance->view_changed_id);
        }

        g_object_unref (instance->current_view);
    }
    g_free (instance->current_type);
    g_free (instance->current_title);
    instance->current_title = NULL;
    instance->current_type = NULL;
    instance->view_changed_id = 0;
    instance->current_view = NULL;
}

static void
connect_view (GalViewInstance *instance,
              GalView *view)
{
    GalViewClass *view_class;

    if (instance->current_view)
        disconnect_view (instance);
    instance->current_view = g_object_ref (view);

    view_class = GAL_VIEW_GET_CLASS (view);

    instance->current_title = g_strdup (gal_view_get_title (view));
    instance->current_type = g_strdup (view_class->type_code);
    instance->view_changed_id = g_signal_connect (
        instance->current_view, "changed",
        G_CALLBACK (view_changed), instance);

    gal_view_instance_display_view (instance, instance->current_view);
}

static void
gal_view_instance_dispose (GObject *object)
{
    GalViewInstance *instance = GAL_VIEW_INSTANCE (object);

    if (instance->collection) {
        if (instance->collection_changed_id) {
            g_signal_handler_disconnect (
                instance->collection,
                instance->collection_changed_id);
        }
        g_object_unref (instance->collection);
    }

    g_free (instance->instance_id);
    g_free (instance->custom_filename);
    g_free (instance->current_view_filename);

    g_free (instance->current_id);
    disconnect_view (instance);

    g_free (instance->default_view);

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

static void
gal_view_instance_class_init (GalViewInstanceClass *class)
{
    GObjectClass *object_class = G_OBJECT_CLASS (class);

    object_class->dispose = gal_view_instance_dispose;

    gal_view_instance_signals[DISPLAY_VIEW] = g_signal_new (
        "display_view",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (GalViewInstanceClass, display_view),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        GAL_TYPE_VIEW);

    gal_view_instance_signals[CHANGED] = g_signal_new (
        "changed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (GalViewInstanceClass, changed),
        NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);

    gal_view_instance_signals[LOADED] = g_signal_new (
        "loaded",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_FIRST,
        G_STRUCT_OFFSET (GalViewInstanceClass, loaded),
        NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);

    class->display_view = NULL;
    class->changed = NULL;
}

static void
gal_view_instance_init (GalViewInstance *instance)
{
    instance->collection = NULL;

    instance->instance_id = NULL;
    instance->custom_filename = NULL;
    instance->current_view_filename = NULL;

    instance->current_title = NULL;
    instance->current_type = NULL;
    instance->current_id = NULL;
    instance->current_view = NULL;

    instance->view_changed_id = 0;
    instance->collection_changed_id = 0;

    instance->loaded = FALSE;
    instance->default_view = NULL;
}

static void
collection_changed (GalView *view,
                    GalViewInstance *instance)
{
    if (instance->current_id) {
        gchar *view_id = instance->current_id;
        instance->current_id = NULL;
        gal_view_instance_set_current_view_id (instance, view_id);
        g_free (view_id);
    }
}

static void
load_current_view (GalViewInstance *instance)
{
    xmlDoc *doc = NULL;
    xmlNode *root;
    GalView *view = NULL;

    if (g_file_test (instance->current_view_filename, G_FILE_TEST_IS_REGULAR)) {
#ifdef G_OS_WIN32
        gchar *locale_filename = g_win32_locale_filename_from_utf8 (instance->current_view_filename);
        if (locale_filename != NULL)
            doc = xmlParseFile (locale_filename);
        g_free (locale_filename);
#else
        doc = xmlParseFile (instance->current_view_filename);
#endif
    }

    if (doc == NULL) {
        instance->current_id = g_strdup (gal_view_instance_get_default_view (instance));

        if (instance->current_id) {
            gint index = gal_view_collection_get_view_index_by_id (
                instance->collection,
                instance->current_id);

            if (index != -1) {
                view = gal_view_collection_get_view (
                    instance->collection, index);
                view = gal_view_clone (view);
                connect_view (instance, view);
            }
        }
        return;
    }

    root = xmlDocGetRootElement (doc);
    instance->current_id = e_xml_get_string_prop_by_name_with_default (root, (const guchar *)"current_view", NULL);

    if (instance->current_id != NULL) {
        gint index = gal_view_collection_get_view_index_by_id (
            instance->collection,
            instance->current_id);

        if (index != -1) {
            view = gal_view_collection_get_view (
                instance->collection, index);
            view = gal_view_clone (view);
        }
    }
    if (view == NULL) {
        gchar *type;
        type = e_xml_get_string_prop_by_name_with_default (root, (const guchar *)"current_view_type", NULL);
        view = gal_view_collection_load_view_from_file (
            instance->collection, type,
            instance->custom_filename);
        g_free (type);
    }

    connect_view (instance, view);

    xmlFreeDoc (doc);
}

/**
 * gal_view_instance_new:
 * @collection: This %GalViewCollection should be loaded before being passed to this function.
 * @instance_id: Which instance of this type of object is this (for most of evo, this is the folder id.)
 *
 * Create a new %GalViewInstance.
 *
 * Return value: The new %GalViewInstance.
 **/
GalViewInstance *
gal_view_instance_new (GalViewCollection *collection,
                       const gchar *instance_id)
{
    GalViewInstance *instance = g_object_new (GAL_TYPE_VIEW_INSTANCE, NULL);
    if (gal_view_instance_construct (instance, collection, instance_id))
        return instance;
    else {
        g_object_unref (instance);
        return NULL;
    }
}

GalViewInstance *
gal_view_instance_construct (GalViewInstance *instance,
                             GalViewCollection *collection,
                             const gchar *instance_id)
{
    gchar *filename;
    gchar *safe_id;
    const gchar *user_directory;

    instance->collection = collection;
    if (collection)
        g_object_ref (collection);
    instance->collection_changed_id = g_signal_connect (
        collection, "changed",
        G_CALLBACK (collection_changed), instance);

    if (instance_id)
        instance->instance_id = g_strdup (instance_id);
    else
        instance->instance_id = g_strdup ("");

    safe_id = g_strdup (instance->instance_id);
    e_filename_make_safe (safe_id);

    user_directory =
        gal_view_collection_get_user_directory (instance->collection);

    filename = g_strdup_printf ("custom_view-%s.xml", safe_id);
    instance->custom_filename =
        g_build_filename (user_directory, filename, NULL);
    g_free (filename);

    filename = g_strdup_printf ("current_view-%s.xml", safe_id);
    instance->current_view_filename =
        g_build_filename (user_directory, filename, NULL);
    g_free (filename);

    g_free (safe_id);

    return instance;
}

/* Manipulate the current view. */
gchar *
gal_view_instance_get_current_view_id (GalViewInstance *instance)
{
    if (instance->current_id && gal_view_collection_get_view_index_by_id (instance->collection, instance->current_id) != -1)
        return g_strdup (instance->current_id);
    else
        return NULL;
}

void
gal_view_instance_set_current_view_id (GalViewInstance *instance,
                                       const gchar *view_id)
{
    GalView *view;
    gint index;

    g_return_if_fail (instance != NULL);
    g_return_if_fail (GAL_IS_VIEW_INSTANCE (instance));

    d (g_print ("%s: view_id set to %s\n", G_STRFUNC, view_id));

    if (instance->current_id && !strcmp (instance->current_id, view_id))
        return;

    g_free (instance->current_id);
    instance->current_id = g_strdup (view_id);

    index = gal_view_collection_get_view_index_by_id (instance->collection, view_id);
    if (index != -1) {
        view = gal_view_collection_get_view (instance->collection, index);
        connect_view (instance, gal_view_clone (view));
    }

    if (instance->loaded)
        save_current_view (instance);
    gal_view_instance_changed (instance);
}

GalView *
gal_view_instance_get_current_view (GalViewInstance *instance)
{
    return instance->current_view;
}

void
gal_view_instance_set_custom_view (GalViewInstance *instance,
                                   GalView *view)
{
    g_free (instance->current_id);
    instance->current_id = NULL;

    view = gal_view_clone (view);
    connect_view (instance, view);
    gal_view_save (view, instance->custom_filename);
    save_current_view (instance);
    gal_view_instance_changed (instance);
}

static void
dialog_response (GtkWidget *dialog,
                 gint id,
                 GalViewInstance *instance)
{
    if (id == GTK_RESPONSE_OK) {
        gal_view_instance_save_as_dialog_save (GAL_VIEW_INSTANCE_SAVE_AS_DIALOG (dialog));
    }
    gtk_widget_destroy (dialog);
}

void
gal_view_instance_save_as (GalViewInstance *instance)
{
    GtkWidget *dialog;

    g_return_if_fail (instance != NULL);

    dialog = gal_view_instance_save_as_dialog_new (instance);
    g_signal_connect (
        dialog, "response",
        G_CALLBACK (dialog_response), instance);
    gtk_widget_show (dialog);
}

/* This is idempotent.  Once it's been called once, the rest of the calls are ignored. */
void
gal_view_instance_load (GalViewInstance *instance)
{
    if (!instance->loaded) {
        load_current_view (instance);
        instance->loaded = TRUE;
        g_signal_emit (instance, gal_view_instance_signals[LOADED], 0);
    }
}

/* These only mean anything before gal_view_instance_load is called the first time.  */
const gchar *
gal_view_instance_get_default_view (GalViewInstance *instance)
{
    if (instance->default_view)
        return instance->default_view;
    else
        return gal_view_collection_get_default_view (instance->collection);
}

void
gal_view_instance_set_default_view (GalViewInstance *instance,
                                    const gchar *id)
{
    g_free (instance->default_view);
    instance->default_view = g_strdup (id);
}

gboolean
gal_view_instance_exists (GalViewInstance *instance)
{
    struct stat st;

    if (instance->current_view_filename && g_stat (instance->current_view_filename, &st) == 0 && st.st_size > 0 && S_ISREG (st.st_mode))
        return TRUE;
    else
        return FALSE;

}