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nautilus-desktop-directory.c

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

   nautilus-desktop-directory.c: Subclass of NautilusDirectory to implement
   a virtual directory consisting of the desktop directory and the desktop
   icons
 
   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.h"

#include "nautilus-directory-private.h"
#include "nautilus-file.h"
#include "nautilus-file-private.h"
#include "nautilus-file-utilities.h"
#include "nautilus-global-preferences.h"
#include <eel/eel-glib-extensions.h>
#include <eel/eel-gtk-macros.h>
#include <gtk/gtk.h>

00039 struct NautilusDesktopDirectoryDetails {
      NautilusDirectory *real_directory;
      GHashTable *callbacks;
      GHashTable *monitors;
};

00045 typedef struct {
      NautilusDesktopDirectory *desktop_dir;
      NautilusDirectoryCallback callback;
      gpointer callback_data;

      NautilusFileAttributes wait_for_attributes;
      gboolean wait_for_file_list;

      GList *non_ready_directories;
      GList *merged_file_list;
} MergedCallback;


00058 typedef struct {
      NautilusDesktopDirectory *desktop_dir;

      gboolean monitor_hidden_files;
      NautilusFileAttributes monitor_attributes;
} MergedMonitor;

static void desktop_directory_changed_callback (gpointer data);

G_DEFINE_TYPE (NautilusDesktopDirectory, nautilus_desktop_directory,
             NAUTILUS_TYPE_DIRECTORY);
#define parent_class nautilus_desktop_directory_parent_class

static gboolean
desktop_contains_file (NautilusDirectory *directory,
                   NautilusFile *file)
{
      NautilusDesktopDirectory *desktop;

      desktop = NAUTILUS_DESKTOP_DIRECTORY (directory);

      if (nautilus_directory_contains_file (desktop->details->real_directory, file)) {
            return TRUE;
      }

      return file->details->directory == directory;
}

static guint
merged_callback_hash (gconstpointer merged_callback_as_pointer)
{
      const MergedCallback *merged_callback;

      merged_callback = merged_callback_as_pointer;
      return GPOINTER_TO_UINT (merged_callback->callback)
            ^ GPOINTER_TO_UINT (merged_callback->callback_data);
}

static gboolean
merged_callback_equal (gconstpointer merged_callback_as_pointer,
                   gconstpointer merged_callback_as_pointer_2)
{
      const MergedCallback *merged_callback, *merged_callback_2;

      merged_callback = merged_callback_as_pointer;
      merged_callback_2 = merged_callback_as_pointer_2;

      return merged_callback->callback == merged_callback_2->callback
            && merged_callback->callback_data == merged_callback_2->callback_data;
}

static void
merged_callback_destroy (MergedCallback *merged_callback)
{
      g_assert (merged_callback != NULL);
      g_assert (NAUTILUS_IS_DESKTOP_DIRECTORY (merged_callback->desktop_dir));

      g_list_free (merged_callback->non_ready_directories);
      nautilus_file_list_free (merged_callback->merged_file_list);
      g_free (merged_callback);
}

static void
merged_callback_check_done (MergedCallback *merged_callback)
{
      /* Check if we are ready. */
      if (merged_callback->non_ready_directories != NULL) {
            return;
      }

      /* Remove from the hash table before sending it. */
      g_hash_table_steal (merged_callback->desktop_dir->details->callbacks, merged_callback);

      /* We are ready, so do the real callback. */
      (* merged_callback->callback) (NAUTILUS_DIRECTORY (merged_callback->desktop_dir),
                               merged_callback->merged_file_list,
                               merged_callback->callback_data);

      /* And we are done. */
      merged_callback_destroy (merged_callback);
}

static void
merged_callback_remove_directory (MergedCallback *merged_callback,
                          NautilusDirectory *directory)
{
      merged_callback->non_ready_directories = g_list_remove
            (merged_callback->non_ready_directories, directory);
      merged_callback_check_done (merged_callback);
}

static void
directory_ready_callback (NautilusDirectory *directory,
                    GList *files,
                    gpointer callback_data)
{
      MergedCallback *merged_callback;

      g_assert (NAUTILUS_IS_DIRECTORY (directory));
      g_assert (callback_data != NULL);

      merged_callback = callback_data;
      g_assert (g_list_find (merged_callback->non_ready_directories, directory) != NULL);

      /* Update based on this call. */
      merged_callback->merged_file_list = g_list_concat
            (merged_callback->merged_file_list,
             nautilus_file_list_copy (files));

      /* Check if we are ready. */
      merged_callback_remove_directory (merged_callback, directory);
}

static void
desktop_call_when_ready (NautilusDirectory *directory,
                   NautilusFileAttributes file_attributes,
                   gboolean wait_for_file_list,
                   NautilusDirectoryCallback callback,
                   gpointer callback_data)
{
      NautilusDesktopDirectory *desktop;
      MergedCallback search_key, *merged_callback;

      desktop = NAUTILUS_DESKTOP_DIRECTORY (directory);

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

      /* Create a merged_callback record. */
      merged_callback = g_new0 (MergedCallback, 1);
      merged_callback->desktop_dir = desktop;
      merged_callback->callback = callback;
      merged_callback->callback_data = callback_data;
      merged_callback->wait_for_attributes = file_attributes;
      merged_callback->wait_for_file_list = wait_for_file_list;
      merged_callback->non_ready_directories = g_list_prepend
                  (merged_callback->non_ready_directories, directory);
      merged_callback->non_ready_directories = g_list_prepend
                  (merged_callback->non_ready_directories, desktop->details->real_directory);


      merged_callback->merged_file_list = g_list_concat (NULL,
                                             nautilus_file_list_copy (directory->details->file_list));

      /* Put it in the hash table. */
      g_hash_table_insert (desktop->details->callbacks,
                       merged_callback, merged_callback);

      /* Now tell all the directories about it. */
      nautilus_directory_call_when_ready
            (desktop->details->real_directory,
             merged_callback->wait_for_attributes,
             merged_callback->wait_for_file_list,
             directory_ready_callback, merged_callback);
      nautilus_directory_call_when_ready_internal
            (directory,
             NULL,
             merged_callback->wait_for_attributes,
             merged_callback->wait_for_file_list,
             directory_ready_callback,
             NULL,
             merged_callback);
      
}

static void
desktop_cancel_callback (NautilusDirectory *directory,
                  NautilusDirectoryCallback callback,
                  gpointer callback_data)
{
      NautilusDesktopDirectory *desktop;
      MergedCallback search_key, *merged_callback;
      GList *node;

      desktop = NAUTILUS_DESKTOP_DIRECTORY (directory);

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

      /* Remove from the hash table before working with it. */
      g_hash_table_steal (merged_callback->desktop_dir->details->callbacks, merged_callback);

      /* Tell all the directories to cancel the call. */
      for (node = merged_callback->non_ready_directories; node != NULL; node = node->next) {
            nautilus_directory_cancel_callback
                  (node->data,
                   directory_ready_callback, merged_callback);
      }
      merged_callback_destroy (merged_callback);
}

static void
merged_monitor_destroy (MergedMonitor *monitor)
{
      NautilusDesktopDirectory *desktop;

      desktop = monitor->desktop_dir;
      
      /* Call through to the real directory remove calls. */
      nautilus_directory_file_monitor_remove (desktop->details->real_directory, monitor);

      nautilus_directory_monitor_remove_internal (NAUTILUS_DIRECTORY (desktop), NULL, monitor);
      
      g_free (monitor);
}

static void
build_merged_callback_list (NautilusDirectory *directory,
                      GList *file_list,
                      gpointer callback_data)
{
      GList **merged_list;

      merged_list = callback_data;
      *merged_list = g_list_concat (*merged_list,
                              nautilus_file_list_copy (file_list));
}

static void
desktop_monitor_add (NautilusDirectory *directory,
                gconstpointer client,
                gboolean monitor_hidden_files,
                NautilusFileAttributes file_attributes,
                NautilusDirectoryCallback callback,
                gpointer callback_data)
{
      NautilusDesktopDirectory *desktop;
      MergedMonitor *monitor;
      GList *merged_callback_list;

      desktop = NAUTILUS_DESKTOP_DIRECTORY (directory);

      /* Map the client to a unique value so this doesn't interfere
       * with direct monitoring of the directory by the same client.
       */
      monitor = g_hash_table_lookup (desktop->details->monitors, client);
      if (monitor != NULL) {
            g_assert (monitor->desktop_dir == desktop);
      } else {
            monitor = g_new0 (MergedMonitor, 1);
            monitor->desktop_dir = desktop;
            g_hash_table_insert (desktop->details->monitors,
                             (gpointer) client, monitor);
      }
      monitor->monitor_hidden_files = monitor_hidden_files;
      monitor->monitor_attributes = file_attributes;
      
      /* Call through to the real directory add calls. */
      merged_callback_list = NULL;

      /* Call up to real dir */
      nautilus_directory_file_monitor_add
            (desktop->details->real_directory, monitor,
             monitor_hidden_files,
             file_attributes,
             build_merged_callback_list, &merged_callback_list);
      
      /* Handle the desktop part */
      merged_callback_list = g_list_concat (merged_callback_list,
                                    nautilus_file_list_copy (directory->details->file_list));

      
      if (callback != NULL) {
            (* callback) (directory, merged_callback_list, callback_data);
      }
      nautilus_file_list_free (merged_callback_list);
}

static void
desktop_monitor_remove (NautilusDirectory *directory,
                   gconstpointer client)
{
      NautilusDesktopDirectory *desktop;
      MergedMonitor *monitor;
      
      desktop = NAUTILUS_DESKTOP_DIRECTORY (directory);

      monitor = g_hash_table_lookup (desktop->details->monitors, client);
      if (monitor == NULL) {
            return;
      }
      
      g_hash_table_remove (desktop->details->monitors, client);
}

static void
desktop_force_reload (NautilusDirectory *directory)
{
      NautilusDesktopDirectory *desktop;

      desktop = NAUTILUS_DESKTOP_DIRECTORY (directory);

      nautilus_directory_force_reload (desktop->details->real_directory);

      /* We don't invalidate the files in desktop, since they are always
         up to date. (And we don't ever want to mark them invalid.) */
}

static gboolean
desktop_are_all_files_seen (NautilusDirectory *directory)
{
      NautilusDesktopDirectory *desktop;

      desktop = NAUTILUS_DESKTOP_DIRECTORY (directory);

      if (!nautilus_directory_are_all_files_seen (desktop->details->real_directory)) {
            return FALSE;
      }

      return TRUE;
}

static gboolean
desktop_is_not_empty (NautilusDirectory *directory)
{
      NautilusDesktopDirectory *desktop;

      desktop = NAUTILUS_DESKTOP_DIRECTORY (directory);

      if (nautilus_directory_is_not_empty (desktop->details->real_directory)) {
            return TRUE;
      }

      return directory->details->file_list != NULL;
}

static GList *
desktop_get_file_list (NautilusDirectory *directory)
{
      GList *real_dir_file_list, *desktop_dir_file_list = NULL;
      
      real_dir_file_list = nautilus_directory_get_file_list
                        (NAUTILUS_DESKTOP_DIRECTORY (directory)->details->real_directory);
      desktop_dir_file_list = EEL_CALL_PARENT_WITH_RETURN_VALUE (NAUTILUS_DIRECTORY_CLASS, get_file_list, (directory));

      return g_list_concat (real_dir_file_list, desktop_dir_file_list);
}

NautilusDirectory *
nautilus_desktop_directory_get_real_directory (NautilusDesktopDirectory *desktop)
{
      nautilus_directory_ref (desktop->details->real_directory);
      return desktop->details->real_directory;
}


static void
desktop_finalize (GObject *object)
{
      NautilusDesktopDirectory *desktop;

      desktop = NAUTILUS_DESKTOP_DIRECTORY (object);

      nautilus_directory_unref (desktop->details->real_directory);

      g_hash_table_destroy (desktop->details->callbacks);
      g_hash_table_destroy (desktop->details->monitors);
      g_free (desktop->details);

      g_signal_handlers_disconnect_by_func (nautilus_preferences,
                                    desktop_directory_changed_callback,
                                    desktop);

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

static void
done_loading_callback (NautilusDirectory *real_directory,
                   NautilusDesktopDirectory *desktop)
{
     nautilus_directory_emit_done_loading (NAUTILUS_DIRECTORY (desktop));
}


static void
forward_files_added_cover (NautilusDirectory *real_directory,
                     GList *files,
                     gpointer callback_data)
{
      nautilus_directory_emit_files_added (NAUTILUS_DIRECTORY (callback_data), files);
}

static void
forward_files_changed_cover (NautilusDirectory *real_directory,
                       GList *files,
                       gpointer callback_data)
{
      nautilus_directory_emit_files_changed (NAUTILUS_DIRECTORY (callback_data), files);
}

static void
update_desktop_directory (NautilusDesktopDirectory *desktop)
{
      char *desktop_path;
      char *desktop_uri;
      NautilusDirectory *real_directory;

      real_directory = desktop->details->real_directory;
      if (real_directory != NULL) {
            g_hash_table_foreach_remove (desktop->details->callbacks, (GHRFunc) gtk_true, NULL);
            g_hash_table_foreach_remove (desktop->details->monitors, (GHRFunc) gtk_true, NULL);

            g_signal_handlers_disconnect_by_func (real_directory, done_loading_callback, desktop);
            g_signal_handlers_disconnect_by_func (real_directory, forward_files_added_cover, desktop);
            g_signal_handlers_disconnect_by_func (real_directory, forward_files_changed_cover, desktop);

            nautilus_directory_unref (real_directory);
      }

      desktop_path = nautilus_get_desktop_directory ();
      desktop_uri = g_filename_to_uri (desktop_path, NULL, NULL);
      real_directory = nautilus_directory_get_by_uri (desktop_uri);
      g_free (desktop_uri);
      g_free (desktop_path);

      g_signal_connect_object (real_directory, "done_loading",
                         G_CALLBACK (done_loading_callback), desktop, 0);
      g_signal_connect_object (real_directory, "files_added",
                         G_CALLBACK (forward_files_added_cover), desktop, 0);
      g_signal_connect_object (real_directory, "files_changed",
                         G_CALLBACK (forward_files_changed_cover), desktop, 0);

      desktop->details->real_directory = real_directory;
}

static void
desktop_directory_changed_callback (gpointer data)
{
      update_desktop_directory (NAUTILUS_DESKTOP_DIRECTORY (data));
      nautilus_directory_force_reload (NAUTILUS_DIRECTORY (data));
}

static void
nautilus_desktop_directory_init (NautilusDesktopDirectory *desktop)
{
      desktop->details = g_new0 (NautilusDesktopDirectoryDetails, 1);

      desktop->details->callbacks = g_hash_table_new_full
            (merged_callback_hash, merged_callback_equal,
             NULL, (GDestroyNotify)merged_callback_destroy);
      desktop->details->monitors = g_hash_table_new_full (NULL, NULL,
                                              NULL, (GDestroyNotify)merged_monitor_destroy);

      update_desktop_directory (NAUTILUS_DESKTOP_DIRECTORY (desktop));

      g_signal_connect_swapped (nautilus_preferences, "changed::" NAUTILUS_PREFERENCES_DESKTOP_IS_HOME_DIR,
                          G_CALLBACK(desktop_directory_changed_callback),
                          desktop);
}

static void
nautilus_desktop_directory_class_init (NautilusDesktopDirectoryClass *class)
{
      NautilusDirectoryClass *directory_class;

      directory_class = NAUTILUS_DIRECTORY_CLASS (class);
      
      G_OBJECT_CLASS (class)->finalize = desktop_finalize;

      directory_class->contains_file = desktop_contains_file;
      directory_class->call_when_ready = desktop_call_when_ready;
      directory_class->cancel_callback = desktop_cancel_callback;
      directory_class->file_monitor_add = desktop_monitor_add;
      directory_class->file_monitor_remove = desktop_monitor_remove;
      directory_class->force_reload = desktop_force_reload;
      directory_class->are_all_files_seen = desktop_are_all_files_seen;
      directory_class->is_not_empty = desktop_is_not_empty;
      /* Override get_file_list so that we can return the list of files
       * in NautilusDesktopDirectory->details->real_directory,
       * in addition to the list of standard desktop icons on the desktop.
       */
      directory_class->get_file_list = desktop_get_file_list;
}
     

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