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2008-06-17 Matthew Allum <mallum@openedhand.com>

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* clutter/clutter-actor.c:
        * clutter/clutter-actor.h:
        Clean up of parenting code (see #972)
        Doc updates to section intro.
        Add clutter_actor_allocate_preferred_size () utility call

        * clutter/clutter-group.c: (clutter_fixed_layout_allocate):
        Use clutter_actor_allocate_preferred_size ()

        * doc/clutter-actor-invariants.txt:
        Add some more notes
This commit is contained in:
Matthew Allum 2008-06-17 13:49:40 +00:00
parent 988cac1dfb
commit 2dbbee28d5
5 changed files with 115 additions and 44 deletions
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14
ChangeLog
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@ -1,3 +1,17 @@
2008-06-17 Matthew Allum <mallum@openedhand.com>
* clutter/clutter-actor.c:
* clutter/clutter-actor.h:
Clean up of parenting code (see #972)
Doc updates to section intro.
Add clutter_actor_allocate_preferred_size () utility call
* clutter/clutter-group.c: (clutter_fixed_layout_allocate):
Use clutter_actor_allocate_preferred_size ()
* doc/clutter-actor-invariants.txt:
Add some more notes
2008-06-17 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/clutter-actor.c:

99
clutter/clutter-actor.c
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@ -32,22 +32,28 @@
* be a #ClutterActor, either by using one of the classes provided by
* Clutter, or by implementing a new #ClutterActor subclass.
*
* Every actor is a 2D surface in a 3D environment. The surface is contained
* inside its bounding box, described by the #ClutterActorBox structure:
* Every actor is a 2D surface positioned and optionally transformed
* in 3D space. The actor is positioned relative to top left corner of
* it parent with the childs origin being its anchor point (also top
* left by default).
*
* The actors 2D surface is contained inside its bounding box,
* described by the #ClutterActorBox structure:
*
* <figure id="actor-box">
* <title>Bounding box of an Actor</title>
* <graphic fileref="actor-box.png" format="PNG"/>
* </figure>
*
* The actor box represents the untransformed area occupied by an actor. Each
* visible actor that has been put on a #ClutterStage also has a transformed
* area, depending on the actual transformations applied to it by the
* developer (scale, rotation), the transformations applied by its
* containers, the transformations applied to the containers themselves and,
* finally, the perspective transformations applied to the #ClutterStage.
* The actor box represents the untransformed area occupied by an
* actor. Each visible actor that has been put on a #ClutterStage also
* has a transformed area, depending on the actual transformations
* applied to it by the developer (scale, rotation). Tranforms will
* also be applied to any child actors. Also applied to all actors by
* the #ClutterStage is a perspective transformation. API is provided
* for both tranformed and untransformed actor geometry information.
*
* The OpenGL modelview matrix for the actor is constructed from
* The 'modelview' transform matrix for the actor is constructed from
* the actor settings by the following order of operations:
* <orderedlist>
* <listitem><para>Translation by actor x, y coords,</para></listitem>
@ -58,19 +64,19 @@
* <listitem><para>Rotation around y axis,</para></listitem>
* <listitem><para>Rotation around x axis,</para></listitem>
* <listitem><para>Translation by actor depth (z),</para></listitem>
* <listitem><para>Clip stencil is applied (this is not an operation on
* <listitem><para>Rectangular Clip is applied (this is not an operation on
* the matrix as such, but it is done as part of the transform set
* up).</para></listitem>
* </orderedlist>
*
* <note>The position of any children is referenced from the top-left corner of
* the parent, not the parent's anchor point.</note>
*
* An actor can either be explicitly sized and positioned, using the
* various size and position accessors, like clutter_actor_set_x() or
* clutter_actor_set_width(); or it can have a preferred width and
* height, which then allows a layout manager to implicitly size and
* position it by "allocating" an area for an actor.
* position it by "allocating" an area for an actor. This allows for
* actors to be manipulate in both a fixed or static parent container
* (i.e. children of #ClutterGroup) and a more automatic or dynamic
* layout based parent container.
*
* When accessing the position and size of an actor, the simple accessors
* like clutter_actor_get_width() and clutter_actor_get_x() will return
@ -81,7 +87,9 @@
* layout manager, you should either use the simple accessors or use the
* size negotiation API.
*
* Events are handled in the following ways:
* Clutter actors are also able to receive input events and react to
* them. Events are handled in the following ways:
*
* <orderedlist>
* <listitem><para>Actors emit pointer events if set reactive, see
* clutter_actor_set_reactive()</para></listitem>
@ -117,7 +125,7 @@
* Every '?' box in the diagram above is an entry point for application
* code.
*
* For implementing a new actor class, please read <link
* For implementing a new custom actor class, please read <link
* linkend="clutter-subclassing-ClutterActor">the corresponding section</link>
* of the API reference.
*/
@ -5646,6 +5654,7 @@ clutter_actor_unparent (ClutterActor *self)
{
ClutterActorPrivate *priv;
ClutterActor *old_parent;
gboolean show_on_set_parent_enabled = TRUE;
g_return_if_fail (CLUTTER_IS_ACTOR (self));
@ -5684,6 +5693,18 @@ clutter_actor_unparent (ClutterActor *self)
if (!(CLUTTER_PRIVATE_FLAGS (self) & CLUTTER_ACTOR_IN_REPARENT))
g_signal_emit (self, actor_signals[PARENT_SET], 0, old_parent);
/* Queue a redraw on old_parent */
if (CLUTTER_ACTOR_IS_VISIBLE (old_parent))
clutter_actor_queue_redraw (old_parent);
/* Could also need to relayout */
if (old_parent->priv->needs_width_request ||
old_parent->priv->needs_height_request ||
old_parent->priv->needs_allocation)
{
clutter_actor_queue_relayout (old_parent);
}
/* remove the reference we acquired in clutter_actor_set_parent() */
g_object_unref (self);
}
@ -5730,13 +5751,14 @@ clutter_actor_reparent (ClutterActor *self,
if (CLUTTER_IS_CONTAINER (priv->parent_actor))
{
ClutterContainer *parent = CLUTTER_CONTAINER (priv->parent_actor);
/* Note, will call unparent() */
clutter_container_remove_actor (parent, self);
}
else
clutter_actor_unparent (self);
if (CLUTTER_IS_CONTAINER (new_parent))
/* Note, will call parent() */
clutter_container_add_actor (CLUTTER_CONTAINER (new_parent), self);
else
clutter_actor_set_parent (self, new_parent);
@ -5747,9 +5769,6 @@ clutter_actor_reparent (ClutterActor *self,
g_object_unref (self);
CLUTTER_UNSET_PRIVATE_FLAGS (self, CLUTTER_ACTOR_IN_REPARENT);
if (CLUTTER_ACTOR_IS_VISIBLE (self))
clutter_actor_queue_redraw (self);
}
}
/**
@ -7340,3 +7359,43 @@ clutter_actor_get_stage (ClutterActor *actor)
return actor;
}
/**
* clutter_actor_allocate_preferred_size:
* @actor: a #ClutterActor
* @absolute_origin_changed: whether the position of the parent has
* changed in stage coordinates
*
* Utility call for Actor implementations that allocates the actors
* preffered natural size.
*
* Since: 0.8
*/
void
clutter_actor_allocate_preferred_size (ClutterActor *actor,
gboolean absolute_origin_changed)
{
ClutterUnit actor_x, actor_y;
ClutterUnit natural_width, natural_height;
ClutterActorBox actor_box;
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
actor_x = clutter_actor_get_xu (actor);
actor_y = clutter_actor_get_yu (actor);
/* All actorren get their position and natural size (the
* container's allocation is flat-out ignored).
*/
clutter_actor_get_preferred_size (actor,
NULL, NULL,
&natural_width,
&natural_height);
actor_box.x1 = actor_x;
actor_box.y1 = actor_y;
actor_box.x2 = actor_box.x1 + natural_width;
actor_box.y2 = actor_box.y1 + natural_height;
clutter_actor_allocate (actor, &actor_box, absolute_origin_changed);
}

4
clutter/clutter-actor.h
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@ -555,6 +555,10 @@ void clutter_actor_apply_relative_transform_to_point (ClutterActor *self,
ClutterActor *ancestor,
ClutterVertex *point,
ClutterVertex *vertex);
void clutter_actor_allocate_preferred_size (ClutterActor *actor,
gboolean absolute_origin_changed);
G_END_DECLS
#endif /* _HAVE_CLUTTER_ACTOR_H */

22
clutter/clutter-group.c
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@ -298,27 +298,7 @@ clutter_fixed_layout_allocate (GList *children,
for (l = children; l != NULL; l = l->next)
{
ClutterActor *child = l->data;
ClutterUnit child_x, child_y;
ClutterUnit natural_width, natural_height;
ClutterActorBox child_box;
child_x = clutter_actor_get_xu (child);
child_y = clutter_actor_get_yu (child);
/* All children get their position and natural size (the
* container's allocation is flat-out ignored).
*/
clutter_actor_get_preferred_size (child,
NULL, NULL,
&natural_width,
&natural_height);
child_box.x1 = child_x;
child_box.y1 = child_y;
child_box.x2 = child_box.x1 + natural_width;
child_box.y2 = child_box.y1 + natural_height;
clutter_actor_allocate (child, &child_box, absolute_origin_changed);
clutter_actor_allocate_preferred_size (child, absolute_origin_changed);
}
}

20
doc/clutter-actor-invariants.txt
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@ -4,6 +4,8 @@ ClutterActor Invariants
ClutterActor behaviour has invariants that will be kept with the same API and
ABI guarantees as the whole Clutter library.
This document refers to the 0.8 release of Clutter.
Sections:
i. Flags
@ -27,7 +29,9 @@ ClutterActor.
CLUTTER_ACTOR_REALIZED
Set by clutter_actor_realize(), unset by clutter_actor_unrealize().
Means: the actor has memory associated to its paint cycle.
Means: the actor has GPU resources associated to its paint cycle.
Once realized an actor needs to be explicitly unrealized unless
being destroyed. Hide, reparent etc will not unrealize.
CLUTTER_ACTOR_MAPPED
Set by clutter_actor_show(), unset by clutter_actor_hide()
@ -42,11 +46,18 @@ CLUTTER_ACTOR_VISIBLE
CLUTTER_ACTOR_REACTIVE
Set and unset by clutter_actor_set_reactive()
Means: the actor is now reactive to events.
Notes:
* If parents need to be reactive for child its up to the
parent implementation. In the case of ClutterGroup it
being marked unreactive does not mark all children unreactive.
* Clutter stage is always reactive.
b. Private ClutterActor flags
CLUTTER_ACTOR_IN_DESTRUCTION
Set internally by clutter_actor_destroy()
Set internally by clutter_actor_destroy().
Used to avoid uneeded overhead when freeing GPU resources on unrealize
CLUTTER_ACTOR_IS_TOPLEVEL
Set internally by the initialization of ClutterStage
@ -110,6 +121,7 @@ In the following
calling clutter_actor_unparent() on an actor will hide the actor;
calling clutter_actor_reparent() on an actor will leave the actor
in the same state.
Niether will unrealize.
iii. State changes
-------------------------------------------------------------------------------
@ -171,12 +183,14 @@ Notes:
* clutter_actor_unparent() will hide the actor except in the special case
when CLUTTER_ACTOR_IN_REPARENT is set.
* 'Composite' Clutter actors need to pass down any allocations to children.
c. Initial state
When creating an actor, the initial state is:
1. !CLUTTER_ACTOR_REALIZED
2. !CLUTTER_ACTOR_MAPPED
3. !CLUTTER_ACTOR_REACTIVE
===============================================================================
$LastChangedDate$