[gnome-control-center/wip/benzea/display-settings-widget: 24/30] common: Add CcValueObject until HdyValueObject is available

[Benjamin Berg <bberg src gnome org>]

commit 3a5841a4550ccb730961a6c60fcb2a895ea506e6
Author: Benjamin Berg <bberg redhat com>
Date:   Wed Jan 23 00:15:37 2019 +0100

    common: Add CcValueObject until HdyValueObject is available
    
    libhandy now has HdyValueObject, this simply copies the class over as it
    will only become available in libhandy 0.8.

 panels/common/cc-value-object.c | 269 ++++++++++++++++++++++++++++++++++++++++
 panels/common/cc-value-object.h |  30 +++++
 panels/common/meson.build       |   2 +
 3 files changed, 301 insertions(+)
---
diff --git a/panels/common/cc-value-object.c b/panels/common/cc-value-object.c
new file mode 100644
index 000000000..c779b3a0b
--- /dev/null
+++ b/panels/common/cc-value-object.c
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2019 Red Hat Inc.
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ *
+ * This is a copy of CcValueObject from libhandy 0.8.
+ * Modified to change the prefix and to not translate the property nick and
+ * description.
+ */
+
+#include <gobject/gvaluecollector.h>
+#include "cc-value-object.h"
+
+/**
+ * SECTION:cc-value-object
+ * @short_description: An object representing a #GValue.
+ * @Title: CcValueObject
+ *
+ * The #CcValueObject object represents a #GValue, allowing it to be
+ * used with #GListModel.
+ *
+ * Since: 0.0.8
+ */
+
+struct _CcValueObject
+{
+  GObject parent_instance;
+
+  GValue value;
+};
+
+G_DEFINE_TYPE (CcValueObject, cc_value_object, G_TYPE_OBJECT)
+
+enum {
+  PROP_0,
+  PROP_VALUE,
+  N_PROPS
+};
+
+static GParamSpec *props [N_PROPS];
+
+/**
+ * cc_value_object_new:
+ * @value: the #GValue to store
+ *
+ * Create a new #CcValueObject.
+ *
+ * Returns: a new #CcValueObject
+ * Since: 0.0.8
+ */
+CcValueObject *
+cc_value_object_new (const GValue *value)
+{
+  return g_object_new (CC_TYPE_VALUE_OBJECT,
+                       "value", value,
+                       NULL);
+}
+
+/**
+ * cc_value_object_new_collect: (skip)
+ * @type: the #GType of the value
+ * @...: the value to store
+ *
+ * Creates a new #CcValueObject. This is a convenience method which uses
+ * the G_VALUE_COLLECT() macro internally.
+ *
+ * Returns: a new #CcValueObject
+ * Since: 0.0.8
+ */
+CcValueObject*
+cc_value_object_new_collect (GType type, ...)
+{
+  g_auto(GValue) value = G_VALUE_INIT;
+  g_autofree gchar *error = NULL;
+  va_list var_args;
+
+  va_start (var_args, type);
+
+  G_VALUE_COLLECT_INIT (&value, type, var_args, 0, &error);
+
+  va_end (var_args);
+
+  if (error)
+    g_critical ("%s: %s", G_STRFUNC, error);
+
+  return g_object_new (CC_TYPE_VALUE_OBJECT,
+                       "value", &value,
+                       NULL);
+}
+
+/**
+ * cc_value_object_new_string: (skip)
+ * @string: (transfer none): the string to store
+ *
+ * Creates a new #CcValueObject. This is a convenience method to create a
+ * #CcValueObject that stores a string.
+ *
+ * Returns: a new #CcValueObject
+ * Since: 0.0.8
+ */
+CcValueObject*
+cc_value_object_new_string (const gchar *string)
+{
+  g_auto(GValue) value = G_VALUE_INIT;
+
+  g_value_init (&value, G_TYPE_STRING);
+  g_value_set_string (&value, string);
+  return cc_value_object_new (&value);
+}
+
+/**
+ * cc_value_object_new_take_string: (skip)
+ * @string: (transfer full): the string to store
+ *
+ * Creates a new #CcValueObject. This is a convenience method to create a
+ * #CcValueObject that stores a string taking ownership of it.
+ *
+ * Returns: a new #CcValueObject
+ * Since: 0.0.8
+ */
+CcValueObject*
+cc_value_object_new_take_string (gchar *string)
+{
+  g_auto(GValue) value = G_VALUE_INIT;
+
+  g_value_init (&value, G_TYPE_STRING);
+  g_value_take_string (&value, string);
+  return cc_value_object_new (&value);
+}
+
+static void
+cc_value_object_finalize (GObject *object)
+{
+  CcValueObject *self = CC_VALUE_OBJECT (object);
+
+  g_value_unset (&self->value);
+
+  G_OBJECT_CLASS (cc_value_object_parent_class)->finalize (object);
+}
+
+static void
+cc_value_object_get_property (GObject    *object,
+                              guint       prop_id,
+                              GValue     *value,
+                              GParamSpec *pspec)
+{
+  CcValueObject *self = CC_VALUE_OBJECT (object);
+
+  switch (prop_id)
+    {
+    case PROP_VALUE:
+      g_value_set_boxed (value, &self->value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+cc_value_object_set_property (GObject      *object,
+                              guint         prop_id,
+                              const GValue *value,
+                              GParamSpec   *pspec)
+{
+  CcValueObject *self = CC_VALUE_OBJECT (object);
+  GValue *real_value;
+
+  switch (prop_id)
+    {
+    case PROP_VALUE:
+      /* construct only */
+      real_value = g_value_get_boxed (value);
+      g_value_init (&self->value, real_value->g_type);
+      g_value_copy (real_value, &self->value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+cc_value_object_class_init (CcValueObjectClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = cc_value_object_finalize;
+  object_class->get_property = cc_value_object_get_property;
+  object_class->set_property = cc_value_object_set_property;
+
+  props[PROP_VALUE] =
+    g_param_spec_boxed ("value", "Value",
+                        "The contained value",
+                        G_TYPE_VALUE,
+                        G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
+
+  g_object_class_install_properties (object_class,
+                                     N_PROPS,
+                                     props);
+}
+
+static void
+cc_value_object_init (CcValueObject *self)
+{
+}
+
+/**
+ * cc_value_object_get_value:
+ * @value: the #CcValueObject
+ *
+ * Return the contained value.
+ *
+ * Returns: (transfer none): the contained #GValue
+ * Since: 0.0.8
+ */
+const GValue*
+cc_value_object_get_value (CcValueObject *value)
+{
+  return &value->value;
+}
+
+/**
+ * cc_value_object_copy_value:
+ * @value: the #CcValueObject
+ * @dest: #GValue with correct type to copy into
+ *
+ * Copy data from the contained #GValue into @dest.
+ *
+ * Since: 0.0.8
+ */
+void
+cc_value_object_copy_value (CcValueObject *value,
+                            GValue         *dest)
+{
+  g_value_copy (&value->value, dest);
+}
+
+/**
+ * cc_value_object_get_string:
+ * @value: the #CcValueObject
+ *
+ * Returns the contained string if the value is of type #G_TYPE_STRING.
+ *
+ * Returns: (transfer none): the contained string
+ * Since: 0.0.8
+ */
+const gchar*
+cc_value_object_get_string (CcValueObject *value)
+{
+  return g_value_get_string (&value->value);
+}
+
+/**
+ * cc_value_object_dup_string:
+ * @value: the #CcValueObject
+ *
+ * Returns a copy of the contained string if the value is of type
+ * #G_TYPE_STRING.
+ *
+ * Returns: (transfer full): a copy of the contained string
+ * Since: 0.0.8
+ */
+gchar*
+cc_value_object_dup_string (CcValueObject *value)
+{
+  return g_value_dup_string (&value->value);
+}
+
diff --git a/panels/common/cc-value-object.h b/panels/common/cc-value-object.h
new file mode 100644
index 000000000..b39c2061c
--- /dev/null
+++ b/panels/common/cc-value-object.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2019 Red Hat Inc.
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#pragma once
+
+#include <gio/gio.h>
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define CC_TYPE_VALUE_OBJECT (cc_value_object_get_type())
+
+G_DECLARE_FINAL_TYPE (CcValueObject, cc_value_object, CC, VALUE_OBJECT, GObject)
+
+CcValueObject *cc_value_object_new             (const GValue *value);
+CcValueObject *cc_value_object_new_collect     (GType         type,
+                                                ...);
+CcValueObject *cc_value_object_new_string      (const gchar  *string);
+CcValueObject *cc_value_object_new_take_string (gchar        *string);
+
+const GValue*   cc_value_object_get_value  (CcValueObject *value);
+void            cc_value_object_copy_value (CcValueObject *value,
+                                            GValue         *dest);
+const gchar*    cc_value_object_get_string (CcValueObject *value);
+gchar*          cc_value_object_dup_string (CcValueObject *value);
+
+G_END_DECLS
diff --git a/panels/common/meson.build b/panels/common/meson.build
index 7d15e64f3..118a84257 100644
--- a/panels/common/meson.build
+++ b/panels/common/meson.build
@@ -26,6 +26,8 @@ common_sources += gnome.mkenums(
 
 sources = files(
   'cc-hostname-entry.c',
+  # Remove once we depend on libhandy 0.8
+  'cc-value-object.c',
   'hostname-helper.c',
   'list-box-helper.c',
 )