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GSettings: add G_SETTINGS_BIND_INVERT_BOOLEAN flag

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When binding a boolean setting to a boolean property, invert the values.
This avoids the requirement for writing a pair of mapping functions for
this extremely common case.

Add a test.

https://bugzilla.gnome.org/show_bug.cgi?id=625833
This commit is contained in:
Ryan Lortie 2010-08-03 02:08:03 -04:00
parent dd2bbc9533
commit ca3b7b75bf
4 changed files with 93 additions and 8 deletions
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71
gio/gsettings.c
View File

@ -2285,6 +2285,23 @@ g_settings_binding_property_changed (GObject *object,
binding->running = FALSE;
}
static gboolean
g_settings_bind_invert_boolean_get_mapping (GValue *value,
GVariant *variant,
gpointer user_data)
{
g_value_set_boolean (value, !g_variant_get_boolean (variant));
return TRUE;
}
static GVariant *
g_settings_bind_invert_boolean_set_mapping (const GValue *value,
const GVariantType *expected_type,
gpointer user_data)
{
return g_variant_new_boolean (!g_value_get_boolean (value));
}
/**
* g_settings_bind:
* @settings: a #GSettings object
@ -2323,8 +2340,20 @@ g_settings_bind (GSettings *settings,
const gchar *property,
GSettingsBindFlags flags)
{
g_settings_bind_with_mapping (settings, key, object, property,
flags, NULL, NULL, NULL, NULL);
GSettingsBindGetMapping get_mapping = NULL;
GSettingsBindSetMapping set_mapping = NULL;
if (flags & G_SETTINGS_BIND_INVERT_BOOLEAN)
{
get_mapping = g_settings_bind_invert_boolean_get_mapping;
set_mapping = g_settings_bind_invert_boolean_set_mapping;
/* can't pass this flag to g_settings_bind_with_mapping() */
flags &= ~G_SETTINGS_BIND_INVERT_BOOLEAN;
}
g_settings_bind_with_mapping (settings, key, object, property, flags,
get_mapping, set_mapping, NULL, NULL);
}
/**
@ -2371,6 +2400,7 @@ g_settings_bind_with_mapping (GSettings *settings,
GQuark binding_quark;
g_return_if_fail (G_IS_SETTINGS (settings));
g_return_if_fail (~flags & G_SETTINGS_BIND_INVERT_BOOLEAN);
objectclass = G_OBJECT_GET_CLASS (object);
@ -2408,10 +2438,39 @@ g_settings_bind_with_mapping (GSettings *settings,
return;
}
if (((get_mapping == NULL && (flags & G_SETTINGS_BIND_GET)) ||
(set_mapping == NULL && (flags & G_SETTINGS_BIND_SET))) &&
!g_settings_mapping_is_compatible (binding->property->value_type,
binding->info.type))
if (get_mapping == g_settings_bind_invert_boolean_get_mapping)
{
/* g_settings_bind_invert_boolean_get_mapping() is a private
* function, so if we are here it means that g_settings_bind() was
* called with G_SETTINGS_BIND_INVERT_BOOLEAN.
*
* Ensure that both sides are boolean.
*/
if (binding->property->value_type != G_TYPE_BOOLEAN)
{
g_critical ("g_settings_bind: G_SETTINGS_BIND_INVERT_BOOLEAN "
"was specified, but property `%s' on type `%s' has "
"type `%s'", property, G_OBJECT_TYPE_NAME (object),
g_type_name ((binding->property->value_type)));
return;
}
if (!g_variant_type_equal (binding->info.type, G_VARIANT_TYPE_BOOLEAN))
{
g_critical ("g_settings_bind: G_SETTINGS_BIND_INVERT_BOOLEAN "
"was specified, but key `%s' on schema `%s' has "
"type `%s'", key, settings->priv->schema_name,
g_variant_type_dup_string (binding->info.type));
return;
}
}
else if (((get_mapping == NULL && (flags & G_SETTINGS_BIND_GET)) ||
(set_mapping == NULL && (flags & G_SETTINGS_BIND_SET))) &&
!g_settings_mapping_is_compatible (binding->property->value_type,
binding->info.type))
{
g_critical ("g_settings_bind: property '%s' on class '%s' has type "
"'%s' which is not compatible with type '%s' of key '%s' "

6
gio/gsettings.h
View File

@ -207,6 +207,9 @@ typedef gboolean (*GSettingsGetMapping) (GVarian
* @G_SETTINGS_BIND_NO_SENSITIVITY: Do not try to bind a "sensitivity" property to the writability of the setting
* @G_SETTINGS_BIND_GET_NO_CHANGES: When set in addition to #G_SETTINGS_BIND_GET, set the #GObject property
* value initially from the setting, but do not listen for changes of the setting
* @G_SETTINGS_BIND_INVERT_BOOLEAN: When passed to g_settings_bind(), uses a pair of mapping functions that invert
* the boolean value when mapping between the setting and the property. The setting and property must both
* be booleans. You can not pass this flag to g_settings_bind_with_mapping().
*
* Flags used when creating a binding. These flags determine in which
* direction the binding works. The default is to synchronize in both
@ -218,7 +221,8 @@ typedef enum
G_SETTINGS_BIND_GET = (1<<0),
G_SETTINGS_BIND_SET = (1<<1),
G_SETTINGS_BIND_NO_SENSITIVITY = (1<<2),
G_SETTINGS_BIND_GET_NO_CHANGES = (1<<3)
G_SETTINGS_BIND_GET_NO_CHANGES = (1<<3),
G_SETTINGS_BIND_INVERT_BOOLEAN = (1<<4)
} GSettingsBindFlags;
void g_settings_bind (GSettings *settings,

21
gio/tests/gsettings.c
View File

@ -681,6 +681,7 @@ enum
{
PROP_0,
PROP_BOOL,
PROP_ANTI_BOOL,
PROP_BYTE,
PROP_INT16,
PROP_UINT16,
@ -701,6 +702,7 @@ typedef struct
GObject parent_instance;
gboolean bool_prop;
gboolean anti_bool_prop;
gchar byte_prop;
gint int16_prop;
guint16 uint16_prop;
@ -750,6 +752,9 @@ test_object_get_property (GObject *object,
case PROP_BOOL:
g_value_set_boolean (value, test_object->bool_prop);
break;
case PROP_ANTI_BOOL:
g_value_set_boolean (value, test_object->anti_bool_prop);
break;
case PROP_BYTE:
g_value_set_char (value, test_object->byte_prop);
break;
@ -805,6 +810,9 @@ test_object_set_property (GObject *object,
case PROP_BOOL:
test_object->bool_prop = g_value_get_boolean (value);
break;
case PROP_ANTI_BOOL:
test_object->anti_bool_prop = g_value_get_boolean (value);
break;
case PROP_BYTE:
test_object->byte_prop = g_value_get_char (value);
break;
@ -883,6 +891,8 @@ test_object_class_init (TestObjectClass *class)
g_object_class_install_property (gobject_class, PROP_BOOL,
g_param_spec_boolean ("bool", "", "", FALSE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_ANTI_BOOL,
g_param_spec_boolean ("anti-bool", "", "", FALSE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_BYTE,
g_param_spec_char ("byte", "", "", G_MININT8, G_MAXINT8, 0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_INT16,
@ -942,7 +952,6 @@ test_simple_binding (void)
obj = test_object_new ();
g_settings_bind (settings, "bool", obj, "bool", G_SETTINGS_BIND_DEFAULT);
g_object_set (obj, "bool", TRUE, NULL);
g_assert_cmpint (g_settings_get_boolean (settings, "bool"), ==, TRUE);
@ -951,6 +960,16 @@ test_simple_binding (void)
g_object_get (obj, "bool", &b, NULL);
g_assert_cmpint (b, ==, FALSE);
g_settings_bind (settings, "anti-bool", obj, "anti-bool",
G_SETTINGS_BIND_INVERT_BOOLEAN);
g_object_set (obj, "anti-bool", FALSE, NULL);
g_assert_cmpint (g_settings_get_boolean (settings, "anti-bool"), ==, TRUE);
g_settings_set_boolean (settings, "anti-bool", FALSE);
b = FALSE;
g_object_get (obj, "anti-bool", &b, NULL);
g_assert_cmpint (b, ==, TRUE);
g_settings_bind (settings, "byte", obj, "byte", G_SETTINGS_BIND_DEFAULT);
g_object_set (obj, "byte", 123, NULL);

3
gio/tests/org.gtk.test.gschema.xml
View File

@ -81,6 +81,9 @@
<key name="bool" type="b">
<default>false</default>
</key>
<key name="anti-bool" type="b">
<default>false</default>
</key>
<key name="byte" type="y">
<default>0</default>
</key>