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layout: Add animation support to LayoutManager

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In order to animate a fluid layout we cannot use the common animation
code paths as they will override the size request and allocation paths
that are handled by the layout manager itself.

One way to introduce animations in the allocation sequence is to use a
Timeline and an Alpha to compute a progress value and then use that
value to interpolate an ActorBox between the initial and final states of
the animation - with the initial state being the last allocation of the
child prior to the animation start, and the final state the allocation
of the child at the end; for every frame of the Timeline we then queue a
relayout on the layout manager's container, which will result in an
animation.

ClutterLayoutManager is the most likely place to add a generic API for
beginning and ending an animation, as well as the place to provide a
default code path to create the ancillary Timeline and Alpha instances
needed to drive the animation.

A LayoutManager sub-class will need to:

  • call clutter_layout_manager_begin_animation() whenever it should
    animate between two states, for instance: whenever a layout property
    changes value;
  • eventually override begin_animation() and end_animation() in case
    further state needs to be set up, and then chain up to the default
    implementation provided by LayoutManager;
  • if a completely different implementation is required, the layout
    manager sub-class should override begin_animation(), end_animation()
    and get_animation_progress().

Inside the allocate() implementation the sub-class should also
interpolate between the last known allocation of a child and the newly
computed allocation.
This commit is contained in:
Emmanuele Bassi 2009-12-12 00:02:43 +00:00
parent 999359d64c
commit f94a903d9e
3 changed files with 204 additions and 22 deletions
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157
clutter/clutter-layout-manager.c
View File

@ -107,6 +107,11 @@
* child of the #ClutterContainer.</para>
* </refsect2>
*
* <refsect2 id="ClutterLayoutManager-animation">
* <title>Animating a ClutterLayoutManager</title>
* <para>...</para>
* </refsect2>
*
* #ClutterLayoutManager is available since Clutter 1.2
*/
@ -117,11 +122,13 @@
#include <glib-object.h>
#include <gobject/gvaluecollector.h>
#include "clutter-alpha.h"
#include "clutter-debug.h"
#include "clutter-layout-manager.h"
#include "clutter-layout-meta.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
#include "clutter-timeline.h"
#define LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED(m,method) G_STMT_START { \
GObject *_obj = G_OBJECT (m); \
@ -142,6 +149,8 @@ G_DEFINE_ABSTRACT_TYPE (ClutterLayoutManager,
G_TYPE_INITIALLY_UNOWNED);
static GQuark quark_layout_meta = 0;
static GQuark quark_layout_alpha = 0;
static guint manager_signals[LAST_SIGNAL] = { 0, };
static void
@ -217,17 +226,92 @@ layout_manager_real_get_child_meta_type (ClutterLayoutManager *manager)
return G_TYPE_INVALID;
}
static void
layout_manager_real_begin_animation (ClutterLayoutManager *manager,
guint duration,
gulong mode)
{
ClutterTimeline *timeline;
ClutterAlpha *alpha;
alpha = g_object_get_qdata (G_OBJECT (manager), quark_layout_alpha);
if (alpha != NULL)
return;
timeline = clutter_timeline_new (duration);
alpha = clutter_alpha_new_full (timeline, mode);
g_object_unref (timeline);
g_signal_connect_swapped (timeline, "completed",
G_CALLBACK (clutter_layout_manager_end_animation),
manager);
g_signal_connect_swapped (timeline, "new-frame",
G_CALLBACK (clutter_layout_manager_layout_changed),
manager);
g_object_set_qdata_full (G_OBJECT (manager),
quark_layout_alpha, alpha,
(GDestroyNotify) g_object_unref);
clutter_timeline_start (timeline);
}
static gdouble
layout_manager_real_get_animation_progress (ClutterLayoutManager *manager)
{
ClutterAlpha *alpha;
alpha = g_object_get_qdata (G_OBJECT (manager), quark_layout_alpha);
if (alpha == NULL)
return 1.0;
return clutter_alpha_get_alpha (alpha);
}
static void
layout_manager_real_end_animation (ClutterLayoutManager *manager)
{
ClutterTimeline *timeline;
ClutterAlpha *alpha;
alpha = g_object_get_qdata (G_OBJECT (manager), quark_layout_alpha);
if (alpha == NULL)
return;
timeline = clutter_alpha_get_timeline (alpha);
g_assert (timeline != NULL);
if (clutter_timeline_is_playing (timeline))
clutter_timeline_stop (timeline);
g_signal_handlers_disconnect_by_func (timeline,
G_CALLBACK (clutter_layout_manager_end_animation),
manager);
g_signal_handlers_disconnect_by_func (timeline,
G_CALLBACK (clutter_layout_manager_layout_changed),
manager);
g_object_set_qdata (G_OBJECT (manager), quark_layout_alpha, NULL);
clutter_layout_manager_layout_changed (manager);
}
static void
clutter_layout_manager_class_init (ClutterLayoutManagerClass *klass)
{
quark_layout_meta =
g_quark_from_static_string ("clutter-layout-manager-child-meta");
quark_layout_alpha =
g_quark_from_static_string ("clutter-layout-manager-alpha");
klass->get_preferred_width = layout_manager_real_get_preferred_width;
klass->get_preferred_height = layout_manager_real_get_preferred_height;
klass->allocate = layout_manager_real_allocate;
klass->create_child_meta = layout_manager_real_create_child_meta;
klass->get_child_meta_type = layout_manager_real_get_child_meta_type;
klass->begin_animation = layout_manager_real_begin_animation;
klass->get_animation_progress = layout_manager_real_get_animation_progress;
klass->end_animation = layout_manager_real_end_animation;
/**
* ClutterLayoutManager::layout-changed:
@ -905,3 +989,76 @@ clutter_layout_manager_list_child_properties (ClutterLayoutManager *manager,
return pspecs;
}
/**
* clutter_layout_manager_begin_animation:
* @manager: a #ClutterLayoutManager
* @duration: the duration of the animation, in milliseconds
* @mode: the easing mode of the animation
*
* Begins an animation of @duration milliseconds, using the provided
* easing @mode
*
* The easing mode can be specified either as a #ClutterAnimationMode
* or as a logical id returned by clutter_alpha_register_func()
*
* The result of this function depends on the @manager implementation
*
* Since: 1.2
*/
void
clutter_layout_manager_begin_animation (ClutterLayoutManager *manager,
guint duration,
gulong mode)
{
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (duration > 0 && duration < 1000);
CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager)->begin_animation (manager,
duration,
mode);
}
/**
* clutter_layout_manager_end_animation:
* @manager: a #ClutterLayoutManager
*
* Ends an animation started by clutter_layout_manager_begin_animation()
*
* The result of this call depends on the @manager implementation
*
* Since: 1.2
*/
void
clutter_layout_manager_end_animation (ClutterLayoutManager *manager)
{
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager)->end_animation (manager);
}
/**
* clutter_layout_manager_get_animation_progress:
* @manager: a #ClutterLayoutManager
*
* Retrieves the progress of the animation, if one has been started by
* clutter_layout_manager_begin_animation()
*
* The returned value has the same semantics of the #ClutterAlpha:alpha
* value
*
* Return value: the progress of the animation
*
* Since: 1.2
*/
gdouble
clutter_layout_manager_get_animation_progress (ClutterLayoutManager *manager)
{
ClutterLayoutManagerClass *klass;
g_return_val_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager), 1.0);
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
return klass->get_animation_progress (manager);
}

20
clutter/clutter-layout-manager.h
View File

@ -82,6 +82,12 @@ struct _ClutterLayoutManager
* @create_child_meta: virtual function; override to create a
* #ClutterLayoutMeta instance associated to a #ClutterContainer and a
* child #ClutterActor, used to maintain layout manager specific properties
* @begin_animation: virtual function; override to control the animation
* of a #ClutterLayoutManager with the given duration and easing mode
* @end_animation: virtual function; override to end an animation started
* by clutter_layout_manager_begin_animation()
* @get_animation_progress: virtual function; override to control the
* progress of the animation of a #ClutterLayoutManager
* @layout_changed: class handler for the #ClutterLayoutManager::layout-changed
* signal
*
@ -96,6 +102,7 @@ struct _ClutterLayoutManagerClass
GInitiallyUnownedClass parent_class;
/*< public >*/
/* vfuncs, not signals */
void (* get_preferred_width) (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
@ -119,6 +126,13 @@ struct _ClutterLayoutManagerClass
ClutterContainer *container,
ClutterActor *actor);
void (* begin_animation) (ClutterLayoutManager *manager,
guint duration,
gulong mode);
gdouble (* get_animation_progress) (ClutterLayoutManager *manager);
void (* end_animation) (ClutterLayoutManager *manager);
/* signals */
void (* layout_changed) (ClutterLayoutManager *manager);
/*< private >*/
@ -184,6 +198,12 @@ void clutter_layout_manager_child_get_property (ClutterLayoutMa
const gchar *property_name,
GValue *value);
void clutter_layout_manager_begin_animation (ClutterLayoutManager *manager,
guint duration,
gulong mode);
void clutter_layout_manager_end_animation (ClutterLayoutManager *manager);
gdouble clutter_layout_manager_get_animation_progress (ClutterLayoutManager *manager);
G_END_DECLS
#endif /* __CLUTTER_LAYOUT_MANAGER_H__ */

5
doc/reference/clutter/clutter-sections.txt
View File

@ -1768,6 +1768,11 @@ clutter_layout_manager_child_get_property
clutter_layout_manager_find_child_property
clutter_layout_manager_list_child_properties
<SUBSECTION>
clutter_layout_manager_begin_animation
clutter_layout_manager_end_animation
clutter_layout_manager_get_animation_progress
<SUBSECTION Standard>
CLUTTER_TYPE_LAYOUT_MANAGER
CLUTTER_LAYOUT_MANAGER