mirror of
https://gitlab.gnome.org/GNOME/libmks.git
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197 lines
5.5 KiB
C
197 lines
5.5 KiB
C
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/*
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* mks-read-only-list-model.c
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*
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* Copyright 2023 Christian Hergert <chergert@redhat.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include "config.h"
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#include "mks-read-only-list-model-private.h"
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struct _MksReadOnlyListModel
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{
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GObject parent_instance;
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GListModel *model;
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gulong items_changed_handler;
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};
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static GType
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mks_read_only_list_model_get_item_type (GListModel *model)
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{
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MksReadOnlyListModel *self = MKS_READ_ONLY_LIST_MODEL (model);
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if (self->model != NULL)
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return g_list_model_get_item_type (self->model);
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return G_TYPE_OBJECT;
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}
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static guint
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mks_read_only_list_model_get_n_items (GListModel *model)
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{
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MksReadOnlyListModel *self = MKS_READ_ONLY_LIST_MODEL (model);
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if (self->model != NULL)
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return g_list_model_get_n_items (self->model);
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return 0;
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}
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static gpointer
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mks_read_only_list_model_get_item (GListModel *model,
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guint position)
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{
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MksReadOnlyListModel *self = MKS_READ_ONLY_LIST_MODEL (model);
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if (self->model != NULL)
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return g_list_model_get_item (self->model, position);
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return NULL;
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}
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static void
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list_model_iface_init (GListModelInterface *iface)
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{
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iface->get_item_type = mks_read_only_list_model_get_item_type;
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iface->get_n_items = mks_read_only_list_model_get_n_items;
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iface->get_item = mks_read_only_list_model_get_item;
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}
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G_DEFINE_FINAL_TYPE_WITH_CODE (MksReadOnlyListModel, mks_read_only_list_model, G_TYPE_OBJECT,
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G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL, list_model_iface_init))
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enum {
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PROP_0,
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PROP_N_ITEMS,
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N_PROPS
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};
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static GParamSpec *properties [N_PROPS];
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static void
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mks_read_only_list_model_items_changed_cb (MksReadOnlyListModel *self,
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guint position,
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guint removed,
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guint added,
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GListModel *model)
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{
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g_assert (MKS_IS_READ_ONLY_LIST_MODEL (self));
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g_assert (G_IS_LIST_MODEL (model));
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if (removed == 0 && added == 0)
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return;
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g_list_model_items_changed (G_LIST_MODEL (self), position, removed, added);
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if (removed != 0 || added != 0)
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g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_N_ITEMS]);
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}
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/**
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* mks_read_only_list_model_new:
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* @model: a #GListModel
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*
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* Creates a #GListModel which is read-only.
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*
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* This is useful for situations where you want to allow for observation
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* of a list but restrict API access to the underlying #GListModel.
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*
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* Returns: (transfer full): a new #MksReadOnlyListModel
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*/
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GListModel *
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mks_read_only_list_model_new (GListModel *model)
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{
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MksReadOnlyListModel *self;
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g_return_val_if_fail (G_IS_LIST_MODEL (model), NULL);
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self = g_object_new (MKS_TYPE_READ_ONLY_LIST_MODEL, NULL);
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if (g_set_object (&self->model, model))
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self->items_changed_handler =
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g_signal_connect_object (self->model,
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"items-changed",
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G_CALLBACK (mks_read_only_list_model_items_changed_cb),
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self,
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G_CONNECT_SWAPPED);
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return G_LIST_MODEL (self);
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}
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static void
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mks_read_only_list_model_dispose (GObject *object)
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{
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MksReadOnlyListModel *self = (MksReadOnlyListModel *)object;
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if (self->model != NULL)
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{
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g_clear_signal_handler (&self->items_changed_handler, self->model);
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g_clear_object (&self->model);
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}
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G_OBJECT_CLASS (mks_read_only_list_model_parent_class)->dispose (object);
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}
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static void
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mks_read_only_list_model_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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MksReadOnlyListModel *self = MKS_READ_ONLY_LIST_MODEL (object);
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switch (prop_id)
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{
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case PROP_N_ITEMS:
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g_value_set_uint (value, self->model ? g_list_model_get_n_items (self->model) : 0);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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}
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static void
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mks_read_only_list_model_class_init (MksReadOnlyListModelClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->dispose = mks_read_only_list_model_dispose;
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object_class->get_property = mks_read_only_list_model_get_property;
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/**
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* MksReadOnlyListModel:n-items:
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*
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* The number of items in the underlying model.
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*
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* This is useful for binding in GtkBuilder UI definitions so that widgetry
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* may be automatically hidden when the list is empty.
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*/
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properties [PROP_N_ITEMS] =
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g_param_spec_uint ("n-items", NULL, NULL,
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0, G_MAXUINT, 0,
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(G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_properties (object_class, N_PROPS, properties);
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}
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static void
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mks_read_only_list_model_init (MksReadOnlyListModel *self)
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{
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}
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