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animator: Allow retrieving type property type from a key

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When asking a key for its target value we also ask the developer to pass
in an initialized GValue - but we don't make it easy to know the type of
the GValue. A developer has to ask the GObject class for the GParamSpec
and then initialize the GValue, instead.

Since we know the type of the GValue we should provide a getter for it.

We should also allow developers to throw at us GValue with compatible and
transformable types.

Finally, all the accessors should be constified.
This commit is contained in:
Emmanuele Bassi 2010-02-08 15:47:46 +00:00
parent 09f91ff6ea
commit 790a13c0d9
2 changed files with 75 additions and 31 deletions
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91
clutter/clutter-animator.c
View File

@ -1340,24 +1340,25 @@ clutter_animator_key_get_type (void)
/**
* clutter_animator_key_get_object:
* @animator_key: a #ClutterAnimatorKey
* @key: a #ClutterAnimatorKey
*
* Retrieves the object a key applies to.
*
* Return value: the object an animator_key exist for.
* Return value: (transfer none): the object an animator_key exist for.
*
* Since: 1.2
*/
GObject *
clutter_animator_key_get_object (ClutterAnimatorKey *animator_key)
clutter_animator_key_get_object (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (animator_key, NULL);
return animator_key->object;
g_return_val_if_fail (key != NULL, NULL);
return key->object;
}
/**
* clutter_animator_key_get_property_name:
* @animator_key: a #ClutterAnimatorKey
* @key: a #ClutterAnimatorKey
*
* Retrieves the name of the property a key applies to.
*
@ -1366,16 +1367,37 @@ clutter_animator_key_get_object (ClutterAnimatorKey *animator_key)
* Since: 1.2
*/
G_CONST_RETURN gchar *
clutter_animator_key_get_property_name (ClutterAnimatorKey *animator_key)
clutter_animator_key_get_property_name (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (animator_key != NULL, NULL);
g_return_val_if_fail (key != NULL, NULL);
return animator_key->property_name;
return key->property_name;
}
/**
* clutter_animator_key_get_property_type:
* @key: a #ClutterAnimatorKey
*
* Retrieves the #GType of the property a key applies to
*
* You can use this type to initialize the #GValue to pass to
* clutter_animator_key_get_value()
*
* Return value: the #GType of the property
*
* Since: 1.2
*/
GType
clutter_animator_key_get_property_type (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (key != NULL, G_TYPE_INVALID);
return G_VALUE_TYPE (&key->value);
}
/**
* clutter_animator_key_get_mode:
* @animator_key: a #ClutterAnimatorKey
* @key: a #ClutterAnimatorKey
*
* Retrieves the mode of a #ClutterAnimator key, for the first key of a
* property for an object this represents the whether the animation is
@ -1387,16 +1409,16 @@ clutter_animator_key_get_property_name (ClutterAnimatorKey *animator_key)
* Since: 1.2
*/
gulong
clutter_animator_key_get_mode (ClutterAnimatorKey *animator_key)
clutter_animator_key_get_mode (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (animator_key != NULL, 0);
g_return_val_if_fail (key != NULL, 0);
return animator_key->mode;
return key->mode;
}
/**
* clutter_animator_key_get_progress:
* @animator_key: a #ClutterAnimatorKey
* @key: a #ClutterAnimatorKey
*
* Retrieves the progress of an clutter_animator_key
*
@ -1405,31 +1427,52 @@ clutter_animator_key_get_mode (ClutterAnimatorKey *animator_key)
* Since: 1.2
*/
gdouble
clutter_animator_key_get_progress (ClutterAnimatorKey *animator_key)
clutter_animator_key_get_progress (const ClutterAnimatorKey *key)
{
g_return_val_if_fail (animator_key != NULL, 0.0);
g_return_val_if_fail (key != NULL, 0.0);
return animator_key->progress;
return key->progress;
}
/**
* clutter_animator_key_get_value:
* @animator_key: a #ClutterAnimatorKey
* @key: a #ClutterAnimatorKey
* @value: a #GValue initialized with the correct type for the animator key
*
* Retrieves a copy of the value for a #ClutterAnimatorKey.
*
* The passed in GValue needs to be already initialized for the value type.
* The passed in #GValue needs to be already initialized for the value
* type of the key or to a type that allow transformation from the value
* type of the key.
*
* Use g_value_unset() when done
* Use g_value_unset() when done.
*
* Return value: %TRUE if the passed #GValue was successfully set, and
* %FALSE otherwise
*
* Since: 1.2
*/
void
clutter_animator_key_get_value (ClutterAnimatorKey *animator_key,
gboolean
clutter_animator_key_get_value (const ClutterAnimatorKey *key,
GValue *value)
{
g_return_if_fail (animator_key != NULL);
GType gtype;
g_value_copy (&animator_key->value, value);
g_return_val_if_fail (key != NULL, FALSE);
gtype = G_VALUE_TYPE (&key->value);
if (g_value_type_compatible (gtype, G_VALUE_TYPE (value)))
{
g_value_copy (&key->value, value);
return TRUE;
}
if (g_value_type_transformable (gtype, G_VALUE_TYPE (value)))
{
if (g_value_transform (&key->value, value))
return TRUE;
}
return FALSE;
}

11
clutter/clutter-animator.h
View File

@ -154,11 +154,12 @@ void clutter_animator_property_set_interpolation (ClutterAnimato
ClutterInterpolation interpolation);
GType clutter_animator_key_get_type (void) G_GNUC_CONST;
GObject * clutter_animator_key_get_object (ClutterAnimatorKey *animator_key);
G_CONST_RETURN gchar *clutter_animator_key_get_property_name (ClutterAnimatorKey *animator_key);
gulong clutter_animator_key_get_mode (ClutterAnimatorKey *animator_key);
gdouble clutter_animator_key_get_progress (ClutterAnimatorKey *animator_key);
void clutter_animator_key_get_value (ClutterAnimatorKey *animator_key,
GObject * clutter_animator_key_get_object (const ClutterAnimatorKey *animator_key);
G_CONST_RETURN gchar *clutter_animator_key_get_property_name (const ClutterAnimatorKey *animator_key);
GType clutter_animator_key_get_property_type (const ClutterAnimatorKey *animator_key);
gulong clutter_animator_key_get_mode (const ClutterAnimatorKey *animator_key);
gdouble clutter_animator_key_get_progress (const ClutterAnimatorKey *animator_key);
gboolean clutter_animator_key_get_value (const ClutterAnimatorKey *animator_key,
GValue *value);
G_END_DECLS