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actor: Add the :child-transform property
An additional transformation that is applied to the children of an actor before their own transformations, but not to the actor itself.
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@ -212,6 +212,9 @@ struct _ClutterTransformInfo
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CoglMatrix transform;
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guint transform_set : 1;
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CoglMatrix child_transform;
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guint child_transform_set : 1;
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};
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const ClutterTransformInfo * _clutter_actor_get_transform_info_or_defaults (ClutterActor *self);
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@ -902,6 +902,8 @@ enum
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PROP_TRANSFORM,
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PROP_TRANSFORM_SET,
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PROP_CHILD_TRANSFORM,
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PROP_CHILD_TRANSFORM_SET,
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PROP_SHOW_ON_SET_PARENT, /*XXX:2.0 remove */
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@ -2981,7 +2983,15 @@ clutter_actor_real_apply_transform (ClutterActor *self,
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priv->allocation.x1 + pivot_x + info->translation.x,
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priv->allocation.y1 + pivot_y + info->translation.y);
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cogl_matrix_init_identity (transform);
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if (_clutter_actor_get_transform_info_or_defaults (priv->parent)->child_transform_set)
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{
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const ClutterTransformInfo *parent_info;
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parent_info = _clutter_actor_get_transform_info_or_defaults (priv->parent);
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clutter_matrix_init_from_matrix (transform, &(parent_info->child_transform));
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}
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else
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cogl_matrix_init_identity (transform);
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/* if we have an overriding transformation, we use that, and get out */
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if (info->transform_set)
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@ -4143,7 +4153,7 @@ static const ClutterTransformInfo default_transform_info = {
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1.0, 1.0, 1.0, { 0, }, /* scale */
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{ 0, }, /* anchor */
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{ 0, }, /* anchor XXX:2.0 - remove*/
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CLUTTER_VERTEX_INIT_ZERO, /* translation */
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@ -4153,6 +4163,7 @@ static const ClutterTransformInfo default_transform_info = {
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0.f, /* pivot-z */
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{ 0.0, }, FALSE, /* transform */
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{ 0.0, }, FALSE, /* child-transform */
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};
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/*< private >
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@ -5052,6 +5063,10 @@ clutter_actor_set_property (GObject *object,
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clutter_actor_set_transform (actor, g_value_get_boxed (value));
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break;
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case PROP_CHILD_TRANSFORM:
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clutter_actor_set_child_transform (actor, g_value_get_boxed (value));
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break;
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case PROP_SHOW_ON_SET_PARENT: /* XXX:2.0 - remove */
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priv->show_on_set_parent = g_value_get_boolean (value);
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break;
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@ -5550,6 +5565,24 @@ clutter_actor_get_property (GObject *object,
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}
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break;
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case PROP_CHILD_TRANSFORM:
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{
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ClutterMatrix m;
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clutter_actor_get_child_transform (actor, &m);
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g_value_set_boxed (value, &m);
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}
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break;
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case PROP_CHILD_TRANSFORM_SET:
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{
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const ClutterTransformInfo *info;
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info = _clutter_actor_get_transform_info_or_defaults (actor);
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g_value_set_boolean (value, info->child_transform_set);
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}
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break;
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case PROP_SHOW_ON_SET_PARENT: /* XXX:2.0 - remove */
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g_value_set_boolean (value, priv->show_on_set_parent);
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break;
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@ -7147,6 +7180,41 @@ clutter_actor_class_init (ClutterActorClass *klass)
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS);
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/**
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* ClutterActor:child-transform:
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*
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* Applies a transformation matrix on each child of an actor.
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*
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* Setting this property with a #ClutterMatrix will set the
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* #ClutterActor:child-transform-set property to %TRUE as a side effect;
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* setting this property with %NULL will set the
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* #ClutterActor:child-transform-set property to %FALSE.
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*
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* Since: 1.12
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*/
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obj_props[PROP_CHILD_TRANSFORM] =
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g_param_spec_boxed ("child-transform",
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P_("Child Transform"),
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P_("Children transformation matrix"),
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CLUTTER_TYPE_MATRIX,
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G_PARAM_READWRITE |
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G_PARAM_STATIC_STRINGS);
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/**
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* ClutterActor:child-transform-set:
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*
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* Whether the #ClutterActor:child-transform property is set.
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*
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* Since: 1.12
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*/
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obj_props[PROP_CHILD_TRANSFORM_SET] =
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g_param_spec_boolean ("child-transform-set",
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P_("Child Transform Set"),
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P_("Whether the child-transform property is set"),
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FALSE,
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS);
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/**
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* ClutterActor:show-on-set-parent:
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*
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@ -19859,3 +19927,67 @@ _clutter_actor_handle_event (ClutterActor *self,
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done:
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g_ptr_array_free (event_tree, TRUE);
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}
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/**
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* clutter_actor_set_child_transform:
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* @self: a #ClutterActor
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* @transform: (allow-none): a #ClutterMatrix, or %NULL
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*
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* Sets the transformation matrix to be applied to all the children
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* of @self prior to their own transformations. The default child
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* transformation is the identity matrix.
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*
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* If @transform is %NULL, the child transform will be unset.
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*
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* Since: 1.12
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*/
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void
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clutter_actor_set_child_transform (ClutterActor *self,
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const ClutterMatrix *transform)
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{
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ClutterTransformInfo *info;
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GObject *obj;
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g_return_if_fail (CLUTTER_IS_ACTOR (self));
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info = _clutter_actor_get_transform_info (self);
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if (transform != NULL)
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clutter_matrix_init_from_matrix (&info->child_transform, transform);
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else
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clutter_matrix_init_identity (&info->child_transform);
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info->child_transform_set = transform != NULL;
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obj = G_OBJECT (self);
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g_object_notify_by_pspec (obj, obj_props[PROP_CHILD_TRANSFORM]);
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g_object_notify_by_pspec (obj, obj_props[PROP_CHILD_TRANSFORM_SET]);
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}
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/**
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* clutter_actor_get_child_transform:
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* @self: a #ClutterActor
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* @transform: (out caller-allocates): a #ClutterMatrix
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*
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* Retrieves the child transformation matrix set using
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* clutter_actor_set_child_transform(); if none is currently set,
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* the @transform matrix will be initialized to the identity matrix.
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*
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* Since: 1.12
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*/
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void
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clutter_actor_get_child_transform (ClutterActor *self,
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ClutterMatrix *transform)
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{
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const ClutterTransformInfo *info;
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g_return_if_fail (CLUTTER_IS_ACTOR (self));
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g_return_if_fail (transform != NULL);
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info = _clutter_actor_get_transform_info_or_defaults (self);
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if (info->child_transform_set)
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clutter_matrix_init_from_matrix (transform, &info->child_transform);
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else
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clutter_matrix_init_identity (transform);
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}
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@ -670,6 +670,12 @@ void clutter_actor_set_transform
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CLUTTER_AVAILABLE_IN_1_12
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void clutter_actor_get_transform (ClutterActor *self,
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ClutterMatrix *transform);
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CLUTTER_AVAILABLE_IN_1_12
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void clutter_actor_set_child_transform (ClutterActor *self,
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const ClutterMatrix *transform);
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CLUTTER_AVAILABLE_IN_1_12
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void clutter_actor_get_child_transform (ClutterActor *self,
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ClutterMatrix *transform);
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void clutter_actor_get_transformed_position (ClutterActor *self,
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gfloat *x,
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gfloat *y);
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@ -89,6 +89,7 @@ clutter_actor_get_anchor_point_gravity
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clutter_actor_get_animation
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clutter_actor_get_background_color
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clutter_actor_get_child_at_index
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clutter_actor_get_child_transform
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clutter_actor_get_children
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clutter_actor_get_clip
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clutter_actor_get_clip_to_allocation
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@ -232,8 +233,9 @@ clutter_actor_set_anchor_point
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clutter_actor_set_anchor_point_from_gravity
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clutter_actor_set_background_color
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clutter_actor_set_child_above_sibling
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clutter_actor_set_child_below_sibling
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clutter_actor_set_child_at_index
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clutter_actor_set_child_below_sibling
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clutter_actor_set_child_transform
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clutter_actor_set_clip
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clutter_actor_set_clip_to_allocation
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clutter_actor_set_content
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