libmks/lib/mks-read-only-list-model.c

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/*
* mks-read-only-list-model.c
*
* Copyright 2023 Christian Hergert <chergert@redhat.com>
*
* 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 3 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/>.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include "config.h"
#include "mks-read-only-list-model-private.h"
struct _MksReadOnlyListModel
{
GObject parent_instance;
GListModel *model;
gulong items_changed_handler;
};
static GType
mks_read_only_list_model_get_item_type (GListModel *model)
{
MksReadOnlyListModel *self = MKS_READ_ONLY_LIST_MODEL (model);
if (self->model != NULL)
return g_list_model_get_item_type (self->model);
return G_TYPE_OBJECT;
}
static guint
mks_read_only_list_model_get_n_items (GListModel *model)
{
MksReadOnlyListModel *self = MKS_READ_ONLY_LIST_MODEL (model);
if (self->model != NULL)
return g_list_model_get_n_items (self->model);
return 0;
}
static gpointer
mks_read_only_list_model_get_item (GListModel *model,
guint position)
{
MksReadOnlyListModel *self = MKS_READ_ONLY_LIST_MODEL (model);
if (self->model != NULL)
return g_list_model_get_item (self->model, position);
return NULL;
}
static void
list_model_iface_init (GListModelInterface *iface)
{
iface->get_item_type = mks_read_only_list_model_get_item_type;
iface->get_n_items = mks_read_only_list_model_get_n_items;
iface->get_item = mks_read_only_list_model_get_item;
}
G_DEFINE_FINAL_TYPE_WITH_CODE (MksReadOnlyListModel, mks_read_only_list_model, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL, list_model_iface_init))
enum {
PROP_0,
PROP_N_ITEMS,
N_PROPS
};
static GParamSpec *properties [N_PROPS];
static void
mks_read_only_list_model_items_changed_cb (MksReadOnlyListModel *self,
guint position,
guint removed,
guint added,
GListModel *model)
{
g_assert (MKS_IS_READ_ONLY_LIST_MODEL (self));
g_assert (G_IS_LIST_MODEL (model));
if (removed == 0 && added == 0)
return;
g_list_model_items_changed (G_LIST_MODEL (self), position, removed, added);
if (removed != 0 || added != 0)
g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_N_ITEMS]);
}
/**
* mks_read_only_list_model_new:
* @model: a #GListModel
*
* Creates a #GListModel which is read-only.
*
* This is useful for situations where you want to allow for observation
* of a list but restrict API access to the underlying #GListModel.
*
* Returns: (transfer full): a new #MksReadOnlyListModel
*/
GListModel *
mks_read_only_list_model_new (GListModel *model)
{
MksReadOnlyListModel *self;
g_return_val_if_fail (G_IS_LIST_MODEL (model), NULL);
self = g_object_new (MKS_TYPE_READ_ONLY_LIST_MODEL, NULL);
if (g_set_object (&self->model, model))
self->items_changed_handler =
g_signal_connect_object (self->model,
"items-changed",
G_CALLBACK (mks_read_only_list_model_items_changed_cb),
self,
G_CONNECT_SWAPPED);
return G_LIST_MODEL (self);
}
static void
mks_read_only_list_model_dispose (GObject *object)
{
MksReadOnlyListModel *self = (MksReadOnlyListModel *)object;
if (self->model != NULL)
{
g_clear_signal_handler (&self->items_changed_handler, self->model);
g_clear_object (&self->model);
}
G_OBJECT_CLASS (mks_read_only_list_model_parent_class)->dispose (object);
}
static void
mks_read_only_list_model_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
MksReadOnlyListModel *self = MKS_READ_ONLY_LIST_MODEL (object);
switch (prop_id)
{
case PROP_N_ITEMS:
g_value_set_uint (value, self->model ? g_list_model_get_n_items (self->model) : 0);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
mks_read_only_list_model_class_init (MksReadOnlyListModelClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = mks_read_only_list_model_dispose;
object_class->get_property = mks_read_only_list_model_get_property;
/**
* MksReadOnlyListModel:n-items:
*
* The number of items in the underlying model.
*
* This is useful for binding in GtkBuilder UI definitions so that widgetry
* may be automatically hidden when the list is empty.
*/
properties [PROP_N_ITEMS] =
g_param_spec_uint ("n-items", NULL, NULL,
0, G_MAXUINT, 0,
(G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_properties (object_class, N_PROPS, properties);
}
static void
mks_read_only_list_model_init (MksReadOnlyListModel *self)
{
}