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actor: Make :allocation animatable

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Calling clutter_actor_allocate() should transition between the current
allocation and the new allocation, by using the defined implementation
of the easing state.

This means that:

  clutter_actor_save_easing_state (actor);
  clutter_actor_allocate (actor, &new_alloc, flags);
  clutter_actor_restore_easing_state (actor);

will cause "actor" to transition between the current allocation and the
desired new allocation.

The trick is to ensure that this happens without invalidating the
entire actor tree, but only the portion of the tree that has the
transitioned actor as the local root. For this reason, we just call the
allocate() implementation from within the transition frame advancement,
without invalidating flags: the actor, after all, *has* a valid
allocation for the duration of the transition.
This commit is contained in:
Emmanuele Bassi 2012-04-20 18:06:02 +01:00
parent 8cb9725699
commit 8ef2c46baa
1 changed files with 43 additions and 14 deletions
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57
clutter/clutter-actor.c
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@ -5851,7 +5851,9 @@ clutter_actor_class_init (ClutterActorClass *klass)
P_("Allocation"),
P_("The actor's allocation"),
CLUTTER_TYPE_ACTOR_BOX,
CLUTTER_PARAM_READABLE);
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS |
CLUTTER_PARAM_ANIMATABLE);
/**
* ClutterActor:request-mode:
@ -8629,6 +8631,26 @@ clutter_actor_adjust_allocation (ClutterActor *self,
*allocation = adj_allocation;
}
static void
clutter_actor_allocate_internal (ClutterActor *self,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags)
{
ClutterActorClass *klass;
CLUTTER_SET_PRIVATE_FLAGS (self, CLUTTER_IN_RELAYOUT);
CLUTTER_NOTE (LAYOUT, "Calling %s::allocate()",
_clutter_actor_get_debug_name (self));
klass = CLUTTER_ACTOR_GET_CLASS (self);
klass->allocate (self, allocation, flags);
CLUTTER_UNSET_PRIVATE_FLAGS (self, CLUTTER_IN_RELAYOUT);
clutter_actor_queue_redraw (self);
}
/**
* clutter_actor_allocate:
* @self: A #ClutterActor
@ -8652,11 +8674,10 @@ clutter_actor_allocate (ClutterActor *self,
const ClutterActorBox *box,
ClutterAllocationFlags flags)
{
ClutterActorPrivate *priv;
ClutterActorClass *klass;
ClutterActorBox old_allocation, real_allocation;
gboolean origin_changed, child_moved, size_changed;
gboolean stage_allocation_changed;
ClutterActorPrivate *priv;
g_return_if_fail (CLUTTER_IS_ACTOR (self));
if (G_UNLIKELY (_clutter_actor_get_stage_internal (self) == NULL))
@ -8734,18 +8755,20 @@ clutter_actor_allocate (ClutterActor *self,
if (child_moved)
flags |= CLUTTER_ABSOLUTE_ORIGIN_CHANGED;
CLUTTER_SET_PRIVATE_FLAGS (self, CLUTTER_IN_RELAYOUT);
/* store the flags here, so that they can be propagated by the
* transition code
*/
self->priv->allocation_flags = flags;
CLUTTER_NOTE (LAYOUT, "Calling %s::allocate()",
_clutter_actor_get_debug_name (self));
klass = CLUTTER_ACTOR_GET_CLASS (self);
klass->allocate (self, &real_allocation, flags);
CLUTTER_UNSET_PRIVATE_FLAGS (self, CLUTTER_IN_RELAYOUT);
if (stage_allocation_changed)
clutter_actor_queue_redraw (self);
if (_clutter_actor_get_transition (self, obj_props[PROP_ALLOCATION]) == NULL)
{
_clutter_actor_create_transition (self, obj_props[PROP_ALLOCATION],
&priv->allocation,
&real_allocation);
}
else
_clutter_actor_update_transition (self, obj_props[PROP_ALLOCATION],
&real_allocation);
}
/**
@ -13342,6 +13365,12 @@ clutter_actor_set_animatable_property (ClutterActor *actor,
clutter_actor_set_size_internal (actor, g_value_get_boxed (value));
break;
case PROP_ALLOCATION:
clutter_actor_allocate_internal (actor,
g_value_get_boxed (value),
actor->priv->allocation_flags);
break;
case PROP_DEPTH:
clutter_actor_set_depth_internal (actor, g_value_get_float (value));
break;