mutter/src/core/meta-selection-source.c

/*
 * Copyright (C) 2018 Red Hat
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 * Author: Carlos Garnacho <carlosg@gnome.org>
 */

#include "config.h"

#include "meta/meta-selection.h"
#include "meta/meta-selection-source.h"

typedef struct MetaSelectionSourcePrivate MetaSelectionSourcePrivate;

struct MetaSelectionSourcePrivate
{
  guint active : 1;
};

G_DEFINE_TYPE_WITH_PRIVATE (MetaSelectionSource,
                            meta_selection_source,
                            G_TYPE_OBJECT)

enum
{
  ACTIVE,
  INACTIVE,
  N_SIGNALS
};

static guint signals[N_SIGNALS] = { 0 };

static void
meta_selection_source_activated (MetaSelectionSource *source)
{
  MetaSelectionSourcePrivate *priv =
    meta_selection_source_get_instance_private (source);

  priv->active = TRUE;
}

static void
meta_selection_source_deactivated (MetaSelectionSource *source)
{
  MetaSelectionSourcePrivate *priv =
    meta_selection_source_get_instance_private (source);

  priv->active = FALSE;
}

static void
meta_selection_source_class_init (MetaSelectionSourceClass *klass)
{
  klass->activated = meta_selection_source_activated;
  klass->deactivated = meta_selection_source_deactivated;

  signals[ACTIVE] =
    g_signal_new ("activated",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                  G_STRUCT_OFFSET (MetaSelectionSourceClass, activated),
                  NULL, NULL, NULL,
                  G_TYPE_NONE, 0);
  signals[INACTIVE] =
    g_signal_new ("deactivated",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                  G_STRUCT_OFFSET (MetaSelectionSourceClass, deactivated),
                  NULL, NULL, NULL,
                  G_TYPE_NONE, 0);
}

static void
meta_selection_source_init (MetaSelectionSource *source)
{
}

void
meta_selection_source_read_async (MetaSelectionSource *source,
                                  const gchar         *mimetype,
                                  GCancellable        *cancellable,
                                  GAsyncReadyCallback  callback,
                                  gpointer             user_data)
{
  g_return_if_fail (META_IS_SELECTION_SOURCE (source));
  g_return_if_fail (mimetype != NULL);
  g_return_if_fail (callback != NULL);

  META_SELECTION_SOURCE_GET_CLASS (source)->read_async (source,
                                                        mimetype,
                                                        cancellable,
                                                        callback,
                                                        user_data);
}

/**
 * meta_selection_source_read_finish:
 * @source: The selection source
 * @result: The async result
 * @error: Location for returned error
 *
 * Finishes a read from the selection source.
 *
 * Returns: (transfer full): The resulting #GInputStream
 */
GInputStream *
meta_selection_source_read_finish (MetaSelectionSource  *source,
                                   GAsyncResult         *result,
                                   GError              **error)
{
  g_return_val_if_fail (META_IS_SELECTION_SOURCE (source), NULL);
  g_return_val_if_fail (g_task_is_valid (result, source), NULL);

  return META_SELECTION_SOURCE_GET_CLASS (source)->read_finish (source,
                                                                result,
                                                                error);
}

/**
 * meta_selection_source_get_mimetypes:
 * @source: The selection source
 *
 * Returns the list of supported mimetypes.
 *
 * Returns: (element-type utf8) (transfer full): The supported mimetypes
 */
GList *
meta_selection_source_get_mimetypes (MetaSelectionSource  *source)
{
  g_return_val_if_fail (META_IS_SELECTION_SOURCE (source), NULL);

  return META_SELECTION_SOURCE_GET_CLASS (source)->get_mimetypes (source);
}

/**
 * meta_selection_source_is_active:
 * @source: the selection source
 *
 * Returns #TRUE if the source is active on a selection.
 *
 * Returns: #TRUE if the source owns a selection.
 **/
gboolean
meta_selection_source_is_active (MetaSelectionSource *source)
{
  MetaSelectionSourcePrivate *priv =
    meta_selection_source_get_instance_private (source);

  g_return_val_if_fail (META_IS_SELECTION_SOURCE (source), FALSE);

  return priv->active;
}