sysprof: add SysprofSingleModel

This model is a helper so that we can create a ListModel with a single item
in it as can be useful from UI files.

src/sysprof/meson.build

@@ -10,6 +10,7 @@ sysprof_sources = [
   'sysprof-samples-section.c',
   'sysprof-section.c',
   'sysprof-sidebar.c',
+  'sysprof-single-model.c',
   'sysprof-window.c',
 ]
 

src/sysprof/sysprof-single-model.c

@@ -0,0 +1,182 @@
+/* sysprof-single-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 "sysprof-single-model.h"
+
+struct _SysprofSingleModel
+{
+  GObject  parent_instance;
+  GObject *item;
+};
+
+enum {
+  PROP_0,
+  PROP_ITEM,
+  N_PROPS
+};
+
+static guint
+get_n_items (GListModel *model)
+{
+  return SYSPROF_SINGLE_MODEL (model)->item ? 1 : 0;
+}
+
+static gpointer
+get_item (GListModel *model,
+          guint       position)
+{
+  if (position == 0 && SYSPROF_SINGLE_MODEL (model)->item)
+    return g_object_ref (SYSPROF_SINGLE_MODEL (model)->item);
+  return NULL;
+}
+
+static GType
+get_item_type (GListModel *model)
+{
+  if (SYSPROF_SINGLE_MODEL (model)->item)
+    return G_OBJECT_TYPE (SYSPROF_SINGLE_MODEL (model)->item);
+  return G_TYPE_OBJECT;
+}
+
+static void
+list_model_iface_init (GListModelInterface *iface)
+{
+  iface->get_n_items = get_n_items;
+  iface->get_item = get_item;
+  iface->get_item_type = get_item_type;
+}
+
+G_DEFINE_FINAL_TYPE_WITH_CODE (SysprofSingleModel, sysprof_single_model, G_TYPE_OBJECT,
+                               G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL, list_model_iface_init))
+
+static GParamSpec *properties[N_PROPS];
+
+static void
+sysprof_single_model_finalize (GObject *object)
+{
+  SysprofSingleModel *self = (SysprofSingleModel *)object;
+
+  g_clear_object (&self->item);
+
+  G_OBJECT_CLASS (sysprof_single_model_parent_class)->finalize (object);
+}
+
+static void
+sysprof_single_model_get_property (GObject    *object,
+                                   guint       prop_id,
+                                   GValue     *value,
+                                   GParamSpec *pspec)
+{
+  SysprofSingleModel *self = SYSPROF_SINGLE_MODEL (object);
+
+  switch (prop_id)
+    {
+    case PROP_ITEM:
+      g_value_set_object (value, sysprof_single_model_get_item (self));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+sysprof_single_model_set_property (GObject      *object,
+                                   guint         prop_id,
+                                   const GValue *value,
+                                   GParamSpec   *pspec)
+{
+  SysprofSingleModel *self = SYSPROF_SINGLE_MODEL (object);
+
+  switch (prop_id)
+    {
+    case PROP_ITEM:
+      sysprof_single_model_set_item (self, g_value_get_object (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+sysprof_single_model_class_init (SysprofSingleModelClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = sysprof_single_model_finalize;
+  object_class->get_property = sysprof_single_model_get_property;
+  object_class->set_property = sysprof_single_model_set_property;
+
+  properties[PROP_ITEM] =
+    g_param_spec_object ("item", NULL, NULL,
+                         G_TYPE_OBJECT,
+                         (G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_properties (object_class, N_PROPS, properties);
+}
+
+static void
+sysprof_single_model_init (SysprofSingleModel *self)
+{
+}
+
+SysprofSingleModel *
+sysprof_single_model_new (void)
+{
+  return g_object_new (SYSPROF_TYPE_SINGLE_MODEL, NULL);
+}
+
+gpointer
+sysprof_single_model_get_item (SysprofSingleModel *self)
+{
+  g_return_val_if_fail (SYSPROF_IS_SINGLE_MODEL (self), NULL);
+
+  return self->item;
+}
+
+void
+sysprof_single_model_set_item (SysprofSingleModel *self,
+                               gpointer            item)
+{
+  g_return_if_fail (SYSPROF_IS_SINGLE_MODEL (self));
+  g_return_if_fail (!item || G_IS_OBJECT (item));
+
+  if (self->item == item)
+    return;
+
+  if (item)
+    g_object_ref (item);
+
+  if (self->item != NULL)
+    {
+      g_clear_object (&self->item);
+      g_list_model_items_changed (G_LIST_MODEL (self), 0, 1, 0);
+    }
+
+  self->item = item;
+
+  if (self->item != NULL)
+    g_list_model_items_changed (G_LIST_MODEL (self), 0, 0, 1);
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_ITEM]);
+}

src/sysprof/sysprof-single-model.h

@@ -0,0 +1,36 @@
+/* sysprof-single-model.h
+ *
+ * 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
+ */
+
+#pragma once
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#define SYSPROF_TYPE_SINGLE_MODEL (sysprof_single_model_get_type())
+
+G_DECLARE_FINAL_TYPE (SysprofSingleModel, sysprof_single_model, SYSPROF, SINGLE_MODEL, GObject)
+
+SysprofSingleModel *sysprof_single_model_new      (void);
+gpointer            sysprof_single_model_get_item (SysprofSingleModel *self);
+void                sysprof_single_model_set_item (SysprofSingleModel *self,
+                                                   gpointer            item);
+
+G_END_DECLS