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binding: Add G_BINDING_INVERT_BOOLEAN

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Since GSettings got the same functionality and flag in commit ca3b7b75b
GBinding should also have the ability to automatically invert a boolean
value without requiring a custom transformation function.
This commit is contained in:
Emmanuele Bassi
2010-08-03 10:29:50 +01:00
parent 3be3ad61d1
commit 90f7f171e6
3 changed files with 130 additions and 13 deletions
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61
gobject/gbinding.c
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@@ -124,6 +124,7 @@ g_binding_flags_get_type (void)
{ G_BINDING_DEFAULT, "G_BINDING_DEFAULT", "default" },
{ G_BINDING_BIDIRECTIONAL, "G_BINDING_BIDIRECTIONAL", "bidirectional" },
{ G_BINDING_SYNC_CREATE, "G_BINDING_SYNC_CREATE", "sync-create" },
{ G_BINDING_INVERT_BOOLEAN, "G_BINDING_INVERT_BOOLEAN", "invert-boolean" },
{ 0, NULL, NULL }
};
GType g_define_type_id =
@@ -301,21 +302,44 @@ done:
return TRUE;
}
static inline gboolean
default_invert_boolean_transform (const GValue *value_a,
GValue *value_b)
{
gboolean value;
g_assert (G_VALUE_HOLDS_BOOLEAN (value_a));
g_assert (G_VALUE_HOLDS_BOOLEAN (value_b));
value = g_value_get_boolean (value_a);
value = !value;
g_value_set_boolean (value_b, value);
return TRUE;
}
static gboolean
default_transform_to (GBinding *binding G_GNUC_UNUSED,
default_transform_to (GBinding *binding,
const GValue *value_a,
GValue *value_b,
gpointer user_data G_GNUC_UNUSED)
{
if (binding->flags & G_BINDING_INVERT_BOOLEAN)
return default_invert_boolean_transform (value_a, value_b);
return default_transform (value_a, value_b);
}
static gboolean
default_transform_from (GBinding *binding G_GNUC_UNUSED,
default_transform_from (GBinding *binding,
const GValue *value_a,
GValue *value_b,
gpointer user_data G_GNUC_UNUSED)
{
if (binding->flags & G_BINDING_INVERT_BOOLEAN)
return default_invert_boolean_transform (value_a, value_b);
return default_transform (value_a, value_b);
}
@@ -809,6 +833,15 @@ g_object_bind_property_full (gpointer source,
return NULL;
}
/* remove the G_BINDING_INVERT_BOOLEAN flag in case we have
* custom transformation functions
*/
if ((flags & G_BINDING_INVERT_BOOLEAN) &&
(transform_to != NULL || transform_from != NULL))
{
flags &= ~G_BINDING_INVERT_BOOLEAN;
}
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (source), source_property);
if (pspec == NULL)
{
@@ -838,6 +871,18 @@ g_object_bind_property_full (gpointer source,
return NULL;
}
if ((flags & G_BINDING_INVERT_BOOLEAN) &&
!(G_PARAM_SPEC_VALUE_TYPE (pspec) == G_TYPE_BOOLEAN))
{
g_warning ("%s: The G_BINDING_INVERT_BOOLEAN flag can only be used "
"when binding boolean properties; the source property '%s' "
"is of type '%s'",
G_STRLOC,
source_property,
g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)));
return NULL;
}
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (target), target_property);
if (pspec == NULL)
{
@@ -867,6 +912,18 @@ g_object_bind_property_full (gpointer source,
return NULL;
}
if ((flags & G_BINDING_INVERT_BOOLEAN) &&
!(G_PARAM_SPEC_VALUE_TYPE (pspec) == G_TYPE_BOOLEAN))
{
g_warning ("%s: The G_BINDING_INVERT_BOOLEAN flag can only be used "
"when binding boolean properties; the target property '%s' "
"is of type '%s'",
G_STRLOC,
target_property,
g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)));
return NULL;
}
binding = g_object_new (G_TYPE_BINDING,
"source", source,
"source-property", source_property,