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nautilus-desktop-directory-file.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*-

   nautilus-desktop-directory-file.c: Subclass of NautilusFile to help implement the
   virtual desktop.
 
   Copyright (C) 2003 Red Hat, Inc.
  
   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.
  
   Author: Alexander Larsson <alexl@redhat.com>
*/

#include <config.h>
#include "nautilus-desktop-directory-file.h"

#include "nautilus-desktop-metadata.h"
#include "nautilus-directory-notify.h"
#include "nautilus-directory-private.h"
#include "nautilus-file-attributes.h"
#include "nautilus-file-private.h"
#include "nautilus-file-utilities.h"
#include <eel/eel-glib-extensions.h>
#include "nautilus-desktop-directory.h"
#include "nautilus-metadata.h"
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <string.h>

00042 struct NautilusDesktopDirectoryFileDetails {
      NautilusDesktopDirectory *desktop_directory;

      NautilusFile *real_dir_file;

      GHashTable *callbacks;
      GHashTable *monitors;
};

00051 typedef struct {
      NautilusDesktopDirectoryFile *desktop_file;
      NautilusFileCallback callback;
      gpointer callback_data;

      NautilusFileAttributes delegated_attributes;
      NautilusFileAttributes non_delegated_attributes;

      GList *non_ready_files;

      gboolean initializing;
} DesktopCallback;

00064 typedef struct {
      NautilusDesktopDirectoryFile *desktop_file;

      NautilusFileAttributes delegated_attributes;
      NautilusFileAttributes non_delegated_attributes;
} DesktopMonitor;

G_DEFINE_TYPE (NautilusDesktopDirectoryFile, nautilus_desktop_directory_file,
             NAUTILUS_TYPE_FILE);

static guint
desktop_callback_hash (gconstpointer desktop_callback_as_pointer)
{
      const DesktopCallback *desktop_callback;

      desktop_callback = desktop_callback_as_pointer;
      return GPOINTER_TO_UINT (desktop_callback->callback)
            ^ GPOINTER_TO_UINT (desktop_callback->callback_data);
}

static gboolean
desktop_callback_equal (gconstpointer desktop_callback_as_pointer,
                  gconstpointer desktop_callback_as_pointer_2)
{
      const DesktopCallback *desktop_callback, *desktop_callback_2;

      desktop_callback = desktop_callback_as_pointer;
      desktop_callback_2 = desktop_callback_as_pointer_2;

      return desktop_callback->callback == desktop_callback_2->callback
            && desktop_callback->callback_data == desktop_callback_2->callback_data;
}

     
static void
real_file_changed_callback (NautilusFile *real_file,
                      gpointer callback_data)
{
      NautilusDesktopDirectoryFile *desktop_file;
      
      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (callback_data);
      nautilus_file_changed (NAUTILUS_FILE (desktop_file));
}

static NautilusFileAttributes 
get_delegated_attributes_mask (void)
{
      return NAUTILUS_FILE_ATTRIBUTE_DEEP_COUNTS |
            NAUTILUS_FILE_ATTRIBUTE_DIRECTORY_ITEM_COUNT |
            NAUTILUS_FILE_ATTRIBUTE_DIRECTORY_ITEM_MIME_TYPES;
}

static void
partition_attributes (NautilusFileAttributes attributes,
                  NautilusFileAttributes *delegated_attributes,
                  NautilusFileAttributes *non_delegated_attributes)
{
      NautilusFileAttributes mask;

      mask = get_delegated_attributes_mask ();

      *delegated_attributes = attributes & mask;
      *non_delegated_attributes = attributes & ~mask;
}

static void
desktop_directory_file_monitor_add (NautilusFile *file,
                            gconstpointer client,
                            NautilusFileAttributes attributes)
{
      NautilusDesktopDirectoryFile *desktop_file;
      DesktopMonitor *monitor;

      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (file);

      /* Map the client to a unique value so this doesn't interfere
       * with direct monitoring of the file by the same client.
       */
      monitor = g_hash_table_lookup (desktop_file->details->monitors, client);
      if (monitor != NULL) {
            g_assert (monitor->desktop_file == desktop_file);
      } else {
            monitor = g_new0 (DesktopMonitor, 1);
            monitor->desktop_file = desktop_file;
            g_hash_table_insert (desktop_file->details->monitors,
                             (gpointer) client, monitor);
      }

      partition_attributes (attributes,
                        &monitor->delegated_attributes,
                        &monitor->non_delegated_attributes);

      /* Pawn off partioned attributes to real dir file */
      nautilus_file_monitor_add (desktop_file->details->real_dir_file,
                           monitor, monitor->delegated_attributes);

      /* Do the rest ourself */
      nautilus_directory_monitor_add_internal
            (file->details->directory, file,
             client, TRUE,
             monitor->non_delegated_attributes,
             NULL, NULL);
}

static void
desktop_directory_file_monitor_remove (NautilusFile *file,
                               gconstpointer client)
{
      NautilusDesktopDirectoryFile *desktop_file;
      DesktopMonitor *monitor;
      
      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (file);
      
      /* Map the client to the value used by the earlier add call. */
        monitor = g_hash_table_lookup (desktop_file->details->monitors, client);
      if (monitor == NULL) {
            return;
      }

      /* Call through to the real file remove calls. */
      g_hash_table_remove (desktop_file->details->monitors, client);

      /* Remove the locally handled parts */
      nautilus_directory_monitor_remove_internal
            (file->details->directory, file, client);
}

static void
desktop_callback_destroy (DesktopCallback *desktop_callback)
{
      g_assert (desktop_callback != NULL);
      g_assert (NAUTILUS_IS_DESKTOP_DIRECTORY_FILE (desktop_callback->desktop_file));

      nautilus_file_unref (NAUTILUS_FILE (desktop_callback->desktop_file));
      g_list_free (desktop_callback->non_ready_files);
      g_free (desktop_callback);
}

static void
desktop_callback_check_done (DesktopCallback *desktop_callback)
{
      /* Check if we are ready. */
      if (desktop_callback->initializing ||
          desktop_callback->non_ready_files != NULL) {
            return;
      }

      /* Remove from the hash table before sending it. */
      g_hash_table_remove (desktop_callback->desktop_file->details->callbacks,
                       desktop_callback);

      /* We are ready, so do the real callback. */
      (* desktop_callback->callback) (NAUTILUS_FILE (desktop_callback->desktop_file),
                              desktop_callback->callback_data);

      /* And we are done. */
      desktop_callback_destroy (desktop_callback);
}

static void
desktop_callback_remove_file (DesktopCallback *desktop_callback,
                        NautilusFile *file)
{
      desktop_callback->non_ready_files = g_list_remove
            (desktop_callback->non_ready_files, file);
      desktop_callback_check_done (desktop_callback);
}

static void
ready_callback (NautilusFile *file,
            gpointer callback_data)
{
      DesktopCallback *desktop_callback;

      g_assert (NAUTILUS_IS_FILE (file));
      g_assert (callback_data != NULL);

      desktop_callback = callback_data;
      g_assert (g_list_find (desktop_callback->non_ready_files, file) != NULL);

      desktop_callback_remove_file (desktop_callback, file);
}

static void
desktop_directory_file_call_when_ready (NautilusFile *file,
                              NautilusFileAttributes attributes,
                              NautilusFileCallback callback,
                              gpointer callback_data)

{
      NautilusDesktopDirectoryFile *desktop_file;
      DesktopCallback search_key, *desktop_callback;

      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (file);

      /* Check to be sure we aren't overwriting. */
      search_key.callback = callback;
      search_key.callback_data = callback_data;
      if (g_hash_table_lookup (desktop_file->details->callbacks, &search_key) != NULL) {
            g_warning ("tried to add a new callback while an old one was pending");
            return;
      }

      /* Create a desktop_callback record. */
      desktop_callback = g_new0 (DesktopCallback, 1);
      nautilus_file_ref (file);
      desktop_callback->desktop_file = desktop_file;
      desktop_callback->callback = callback;
      desktop_callback->callback_data = callback_data;
      desktop_callback->initializing = TRUE;

      partition_attributes (attributes,
                        &desktop_callback->delegated_attributes,
                        &desktop_callback->non_delegated_attributes);

      desktop_callback->non_ready_files = g_list_prepend
            (desktop_callback->non_ready_files, file);
      desktop_callback->non_ready_files = g_list_prepend
            (desktop_callback->non_ready_files, desktop_file->details->real_dir_file);
      
      /* Put it in the hash table. */
      g_hash_table_insert (desktop_file->details->callbacks,
                       desktop_callback, desktop_callback);

      /* Now connect to each file's call_when_ready. */
      nautilus_directory_call_when_ready_internal
            (file->details->directory, file,
             desktop_callback->non_delegated_attributes,
             FALSE, NULL, ready_callback, desktop_callback);
      nautilus_file_call_when_ready
                  (desktop_file->details->real_dir_file,
                   desktop_callback->delegated_attributes,
                   ready_callback, desktop_callback);

      desktop_callback->initializing = FALSE;

      /* Check if any files became read while we were connecting up
       * the call_when_ready callbacks (also handles the pathological
       * case where there are no files at all).
       */
      desktop_callback_check_done (desktop_callback);

}

static void
desktop_directory_file_cancel_call_when_ready (NautilusFile *file,
                                     NautilusFileCallback callback,
                                     gpointer callback_data)
{
      NautilusDesktopDirectoryFile *desktop_file;
      DesktopCallback search_key, *desktop_callback;

      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (file);

      /* Find the entry in the table. */
      search_key.callback = callback;
      search_key.callback_data = callback_data;
      desktop_callback = g_hash_table_lookup (desktop_file->details->callbacks, &search_key);
      if (desktop_callback == NULL) {
            return;
      }

      /* Remove from the hash table before working with it. */
      g_hash_table_remove (desktop_callback->desktop_file->details->callbacks, desktop_callback);

      /* Tell the real directory to cancel the call. */
      nautilus_directory_cancel_callback_internal
            (file->details->directory, file,
             NULL, ready_callback, desktop_callback);
      
      nautilus_file_cancel_call_when_ready
            (desktop_file->details->real_dir_file,
             ready_callback, desktop_callback);
      
      desktop_callback_destroy (desktop_callback);
}

static gboolean
real_check_if_ready (NautilusFile *file,
                 NautilusFileAttributes attributes)
{
      return nautilus_directory_check_if_ready_internal
            (file->details->directory, file,
             attributes);
}

static gboolean
desktop_directory_file_check_if_ready (NautilusFile *file,
                               NautilusFileAttributes attributes)
{
      NautilusFileAttributes delegated_attributes, non_delegated_attributes;
      NautilusDesktopDirectoryFile *desktop_file;

      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (file);

      partition_attributes (attributes,
                        &delegated_attributes,
                        &non_delegated_attributes);

      return real_check_if_ready (file, non_delegated_attributes) &&
            nautilus_file_check_if_ready (desktop_file->details->real_dir_file,
                                    delegated_attributes);
}

static gboolean
desktop_directory_file_get_item_count (NautilusFile *file, 
                               guint *count,
                               gboolean *count_unreadable)
{
      NautilusDesktopDirectoryFile *desktop_file;
      gboolean got_count;
      
      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (file);
      
      got_count = nautilus_file_get_directory_item_count (desktop_file->details->real_dir_file,
                                              count,
                                              count_unreadable);

      if (count) {
            *count += g_list_length (file->details->directory->details->file_list);
      }
      
      return got_count;
}

static NautilusRequestStatus
desktop_directory_file_get_deep_counts (NautilusFile *file,
                              guint *directory_count,
                              guint *file_count,
                              guint *unreadable_directory_count,
                              goffset *total_size)
{
      NautilusDesktopDirectoryFile *desktop_file;
      NautilusRequestStatus status;

      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (file);
      
      status = nautilus_file_get_deep_counts (desktop_file->details->real_dir_file,
                                    directory_count,
                                    file_count,
                                    unreadable_directory_count,
                                    total_size,
                                    TRUE);

      if (file_count) {
            *file_count += g_list_length (file->details->directory->details->file_list);
      }
      
      return status;
}

static gboolean
desktop_directory_file_get_date (NautilusFile *file,
                         NautilusDateType date_type,
                         time_t *date)
{
      NautilusDesktopDirectoryFile *desktop_file;

      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (file);

      return nautilus_file_get_date (desktop_file->details->real_dir_file,
                               date_type,
                               date);
}

static char *
desktop_directory_file_get_where_string (NautilusFile *file)
{
      return g_strdup (_("on the desktop"));
}


static void
monitor_destroy (gpointer data)
{
      DesktopMonitor *monitor = data;
      
      nautilus_file_monitor_remove
            (NAUTILUS_FILE (monitor->desktop_file->details->real_dir_file), monitor);
      g_free (monitor);
}

static void
nautilus_desktop_directory_file_set_metadata (NautilusFile           *file,
                                    const char             *key,
                                    const char             *value)
{
      nautilus_desktop_set_metadata_string (file, "directory", key, value);
}

static void
nautilus_desktop_directory_file_set_metadata_as_list (NautilusFile           *file,
                                          const char             *key,
                                          char                  **value)
{
      nautilus_desktop_set_metadata_stringv (file, "directory", key, (const gchar **) value);
}

static void
nautilus_desktop_directory_file_init (NautilusDesktopDirectoryFile *desktop_file)
{
      NautilusDesktopDirectory *desktop_directory;
      NautilusDirectory *real_dir;
      NautilusFile *real_dir_file;

      desktop_file->details = G_TYPE_INSTANCE_GET_PRIVATE (desktop_file,
                                               NAUTILUS_TYPE_DESKTOP_DIRECTORY_FILE,
                                               NautilusDesktopDirectoryFileDetails);

      desktop_directory = NAUTILUS_DESKTOP_DIRECTORY (nautilus_directory_get_by_uri (EEL_DESKTOP_URI));
      desktop_file->details->desktop_directory = desktop_directory;

      desktop_file->details->callbacks = g_hash_table_new
            (desktop_callback_hash, desktop_callback_equal);
      desktop_file->details->monitors = g_hash_table_new_full (NULL, NULL,
                                                 NULL, monitor_destroy);

      real_dir = nautilus_desktop_directory_get_real_directory (desktop_directory);
      real_dir_file = nautilus_directory_get_corresponding_file (real_dir);
      nautilus_directory_unref (real_dir);
      
      desktop_file->details->real_dir_file = real_dir_file;

      nautilus_desktop_update_metadata_from_keyfile (NAUTILUS_FILE (desktop_file), "directory");

      g_signal_connect_object (real_dir_file, "changed",
                         G_CALLBACK (real_file_changed_callback), desktop_file, 0);
}


static void
desktop_callback_remove_file_cover (gpointer key,
                            gpointer value,
                            gpointer callback_data)
{
      desktop_callback_remove_file
            (value, NAUTILUS_FILE (callback_data));
}


static void
desktop_finalize (GObject *object)
{
      NautilusDesktopDirectoryFile *desktop_file;
      NautilusDesktopDirectory *desktop_directory;

      desktop_file = NAUTILUS_DESKTOP_DIRECTORY_FILE (object);
      desktop_directory = desktop_file->details->desktop_directory;

      /* Todo: ghash now safe? */
      eel_g_hash_table_safe_for_each
            (desktop_file->details->callbacks,
             desktop_callback_remove_file_cover,
             desktop_file->details->real_dir_file);
      
      if (g_hash_table_size (desktop_file->details->callbacks) != 0) {
            g_warning ("call_when_ready still pending when desktop virtual file is destroyed");
      }

      g_hash_table_destroy (desktop_file->details->callbacks);
      g_hash_table_destroy (desktop_file->details->monitors);

      nautilus_file_unref (desktop_file->details->real_dir_file);
      nautilus_directory_unref (NAUTILUS_DIRECTORY (desktop_directory));

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

static void
nautilus_desktop_directory_file_class_init (NautilusDesktopDirectoryFileClass *klass)
{
      GObjectClass *object_class;
      NautilusFileClass *file_class;

      object_class = G_OBJECT_CLASS (klass);
      file_class = NAUTILUS_FILE_CLASS (klass);
      
      object_class->finalize = desktop_finalize;

      file_class->default_file_type = G_FILE_TYPE_DIRECTORY;
      
      file_class->monitor_add = desktop_directory_file_monitor_add;
      file_class->monitor_remove = desktop_directory_file_monitor_remove;
      file_class->call_when_ready = desktop_directory_file_call_when_ready;
      file_class->cancel_call_when_ready = desktop_directory_file_cancel_call_when_ready;
      file_class->check_if_ready = desktop_directory_file_check_if_ready;
      file_class->get_item_count = desktop_directory_file_get_item_count;
      file_class->get_deep_counts = desktop_directory_file_get_deep_counts;
      file_class->get_date = desktop_directory_file_get_date;
      file_class->get_where_string = desktop_directory_file_get_where_string;
      file_class->set_metadata = nautilus_desktop_directory_file_set_metadata;
      file_class->set_metadata_as_list = nautilus_desktop_directory_file_set_metadata_as_list;

      g_type_class_add_private (klass, sizeof (NautilusDesktopDirectoryFileDetails));
}

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