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mutter/clutter/clutter-layout-manager.c
Emmanuele Bassi 8a5686d835 Further annotation fixes
2010-09-08 16:41:47 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2009 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Author:
* Emmanuele Bassi <ebassi@linux.intel.com>
*/
/**
* SECTION:clutter-layout-manager
* @short_description: Layout managers base class
*
* #ClutterLayoutManager is a base abstract class for layout managers. A
* layout manager implements the layouting policy for a composite or a
* container actor: it controls the preferred size of the actor to which
* it has been paired, and it controls the allocation of its children.
*
* Any composite or container #ClutterActor subclass can delegate the
* layouting of its children to a #ClutterLayoutManager. Clutter provides
* a generic container using #ClutterLayoutManager called #ClutterBox.
*
* Clutter provides some simple #ClutterLayoutManager sub-classes, like
* #ClutterFlowLayout and #ClutterBinLayout.
*
* <refsect2 id="ClutterLayoutManager-use-in-Actor">
* <title>Using a Layout Manager inside an Actor</title>
* <para>In order to use a #ClutterLayoutManager inside a #ClutterActor
* sub-class you should invoke clutter_layout_manager_get_preferred_width()
* inside the <structname>ClutterActor</structname>::get_preferred_width()
* virtual function and clutter_layout_manager_get_preferred_height()
* inside the <structname>ClutterActor</structname>::get_preferred_height()
* virtual function implementations. You should also call
* clutter_layout_manager_allocate() inside the implementation of the
* <structname>ClutterActor</structname>::allocate() virtual
* function.</para>
* <para>In order to receive notifications for changes in the layout
* manager policies you should also connect to the
* #ClutterLayoutManager::layout-changed signal and queue a relayout
* on your actor. The following code should be enough if the actor
* does not need to perform specific operations whenever a layout
* manager changes:</para>
* <informalexample><programlisting>
* g_signal_connect_swapped (layout_manager,
* "layout-changed",
* G_CALLBACK (clutter_actor_queue_relayout),
* actor);
* </programlisting></informalexample>
* </refsect2>
*
* <refsect2 id="ClutterLayoutManager-implementation">
* <title>Implementing a ClutterLayoutManager</title>
* <para>The implementation of a layout manager does not differ from
* the implementation of the size requisition and allocation bits of
* #ClutterActor, so you should read the relative documentation
* <link linkend="clutter-subclassing-ClutterActor">for subclassing
* ClutterActor</link>.</para>
* <para>The layout manager implementation can hold a back pointer
* to the #ClutterContainer by implementing the
* <function>set_container()</function> virtual function. The layout manager
* should not hold a real reference (i.e. call g_object_ref()) on the
* container actor, to avoid reference cycles.</para>
* <para>If the layout manager has properties affecting the layout
* policies then it should emit the #ClutterLayoutManager::layout-changed
* signal on itself by using the clutter_layout_manager_layout_changed()
* function whenever one of these properties changes.</para>
* <para>If the layout manager has layout properties, that is properties that
* should exist only as the result of the presence of a specific (layout
* manager, container actor, child actor) combination, and it wishes to store
* those properties inside a #ClutterLayoutMeta then it should override the
* <structname>ClutterLayoutManager</structname>::get_child_meta_type()
* virtual function to return the #GType of the #ClutterLayoutMeta sub-class
* used to store the layout properties; optionally, the #ClutterLayoutManager
* sub-class might also override the
* <structname>ClutterLayoutManager</structname>::create_child_meta() virtual
* function to control how the #ClutterLayoutMeta instance is created,
* otherwise the default implementation will be equivalent to:</para>
* <informalexample><programlisting>
* ClutterLayoutManagerClass *klass;
* GType meta_type;
*
* klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
* meta_type = klass->get_child_meta_type (manager);
*
* return g_object_new (meta_type,
* "manager", manager,
* "container", container,
* "actor", actor,
* NULL);
* </programlisting></informalexample>
* <para>Where <varname>manager</varname> is the #ClutterLayoutManager,
* <varname>container</varname> is the #ClutterContainer using the
* #ClutterLayoutManager and <varname>actor</varname> is the #ClutterActor
* child of the #ClutterContainer.</para>
* </refsect2>
*
* <refsect2 id="ClutterLayoutManager-animation">
* <title>Animating a ClutterLayoutManager</title>
* <para>A layout manager is used to let a #ClutterContainer take complete
* ownership over the layout (that is: the position and sizing) of its
* children; this means that using the Clutter animation API, like
* clutter_actor_animate(), to animate the position and sizing of a child of
* a layout manager it is not going to work properly, as the animation will
* automatically override any setting done by the layout manager
* itself.</para>
* <para>It is possible for a #ClutterLayoutManager sub-class to animate its
* children layout by using the base class animation support. The
* #ClutterLayoutManager animation support consists of three virtual
* functions: <function>begin_animation()</function>,
* <function>get_animation_progress()</function> and
* <function>end_animation()</function>.</para>
* <variablelist>
* <varlistentry>
* <term><function>begin_animation (duration, easing)</function></term>
* <listitem><para>This virtual function is invoked when the layout
* manager should begin an animation. The implementation should set up
* the state for the animation and create the ancillary objects for
* animating the layout. The default implementation creates a
* #ClutterTimeline for the given duration and a #ClutterAlpha binding
* the timeline to the given easing mode. This function returns a
* #ClutterAlpha which should be used to control the animation from
* the caller perspective.</para></listitem>
* </varlistentry>
* <varlistentry>
* <term><function>get_animation_progress()</function></term>
* <listitem><para>This virtual function should be invoked when animating
* a layout manager. It returns the progress of the animation, using the
* same semantics as the #ClutterAlpha:alpha value.</para></listitem>
* </varlistentry>
* <varlistentry>
* <term><function>end_animation()</function></term>
* <listitem><para>This virtual function is invoked when the animation of
* a layout manager ends, and it is meant to be used for bookkeeping the
* objects created in the <function>begin_animation()</function>
* function. The default implementation will call it implicitly when the
* timeline is complete.</para></listitem>
* </varlistentry>
* </variablelist>
* <para>The simplest way to animate a layout is to create a #ClutterTimeline
* inside the <function>begin_animation()</function> virtual function, along
* with a #ClutterAlpha, and for each #ClutterTimeline::new-frame signal
* emission call clutter_layout_manager_layout_changed(), which will cause a
* relayout. The #ClutterTimeline::completed signal emission should cause
* clutter_layout_manager_end_animation() to be called. The default
* implementation provided internally by #ClutterLayoutManager does exactly
* this, so most sub-classes should either not override any animation-related
* virtual function or simply override <function>begin_animation()</function>
* and <function>end_animation()</function> to set up ad hoc state, and then
* chain up to the parent's implementation.</para>
* <example id="example-ClutterLayoutManager-animation">
* <title>Animation of a Layout Manager</title>
* <para>The code below shows how a #ClutterLayoutManager sub-class should
* provide animating the allocation of its children from within the
* <function>allocate()</function> virtual function implementation. The
* animation is computed between the last stable allocation performed
* before the animation started and the desired final allocation.</para>
* <para>The <varname>is_animating</varname> variable is stored inside the
* #ClutterLayoutManager sub-class and it is updated by overriding the
* <function>begin_animation()</function> and
* <function>end_animation()</function> virtual functions and chaining up
* to the base class implementation.</para>
* <para>The last stable allocation is stored within a #ClutterLayoutMeta
* sub-class used by the implementation.</para>
* <programlisting>
* static void
* my_layout_manager_allocate (ClutterLayoutManager *manager,
* ClutterContainer *container,
* const ClutterActorBox *allocation,
* ClutterAllocationFlags flags)
* {
* MyLayoutManager *self = MY_LAYOUT_MANAGER (manager);
* GList *children, *l;
*
* children = clutter_container_get_children (container);
*
* for (l = children; l != NULL; l = l-&gt;next)
* {
* ClutterActor *child = l->data;
* ClutterLayoutMeta *meta;
* MyLayoutMeta *my_meta;
*
* /&ast; retrieve the layout meta-object &ast;/
* meta = clutter_layout_manager_get_child_meta (manager,
* container,
* child);
* my_meta = MY_LAYOUT_META (meta);
*
* /&ast; compute the desired allocation for the child &ast;/
* compute_allocation (self, my_meta, child,
* allocation, flags,
* &amp;child_box);
*
* /&ast; this is the additional code that deals with the animation
* &ast; of the layout manager
* &ast;/
* if (!self-&gt;is_animating)
* {
* /&ast; store the last stable allocation for later use &ast;/
* my_meta-&gt;last_alloc = clutter_actor_box_copy (&amp;child_box);
* }
* else
* {
* ClutterActorBox end = { 0, };
* gdouble p;
*
* /&ast; get the progress of the animation &ast;/
* p = clutter_layout_manager_get_animation_progress (manager);
*
* if (my_meta-&gt;last_alloc != NULL)
* {
* /&ast; copy the desired allocation as the final state &ast;/
* end = child_box;
*
* /&ast; then interpolate the initial and final state
* &ast; depending on the progress of the animation,
* &ast; and put the result inside the box we will use
* &ast; to allocate the child
* &ast;/
* clutter_actor_box_interpolate (my_meta-&gt;last_alloc,
* &amp;end,
* p,
* &amp;child_box);
* }
* else
* {
* /&ast; if there is no stable allocation then the child was
* &ast; added while animating; one possible course of action
* &ast; is to just bail out and fall through to the allocation
* &ast; to position the child directly at its final state
* &ast;/
* my_meta-&gt;last_alloc =
* clutter_actor_box_copy (&amp;child_box);
* }
* }
*
* /&ast; allocate the child &ast;/
* clutter_actor_allocate (child, &child_box, flags);
* }
*
* g_list_free (children);
* }
* </programlisting>
* </example>
* <para>Sub-classes of #ClutterLayoutManager that support animations of the
* layout changes should call clutter_layout_manager_begin_animation()
* whenever a layout property changes value, e.g.:</para>
* <informalexample>
* <programlisting>
* if (self->orientation != new_orientation)
* {
* ClutterLayoutManager *manager;
*
* self->orientation = new_orientation;
*
* manager = CLUTTER_LAYOUT_MANAGER (self);
* clutter_layout_manager_layout_changed (manager);
* clutter_layout_manager_begin_animation (manager, 500, CLUTTER_LINEAR);
*
* g_object_notify (G_OBJECT (self), "orientation");
* }
* </programlisting>
* </informalexample>
* <para>The code above will animate a change in the
* <varname>orientation</varname> layout property of a layout manager.</para>
* </refsect2>
*
* #ClutterLayoutManager is available since Clutter 1.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#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); \
g_warning ("Layout managers of type %s do not implement " \
"the ClutterLayoutManager::%s method", \
G_OBJECT_TYPE_NAME (_obj), \
(method)); } G_STMT_END
enum
{
LAYOUT_CHANGED,
LAST_SIGNAL
};
G_DEFINE_ABSTRACT_TYPE (ClutterLayoutManager,
clutter_layout_manager,
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
layout_manager_freeze_layout_change (ClutterLayoutManager *manager)
{
gpointer is_frozen;
CLUTTER_NOTE (LAYOUT, "Freezing changes for manager '%s'[%p]",
G_OBJECT_TYPE_NAME (manager),
manager);
is_frozen = g_object_get_data (G_OBJECT (manager), "freeze-change");
if (is_frozen == NULL)
g_object_set_data (G_OBJECT (manager), "freeze-change",
GUINT_TO_POINTER (1));
else
{
guint level = GPOINTER_TO_UINT (is_frozen) + 1;
g_object_set_data (G_OBJECT (manager), "freeze-change",
GUINT_TO_POINTER (level));
}
}
static void
layout_manager_thaw_layout_change (ClutterLayoutManager *manager)
{
gpointer is_frozen;
is_frozen = g_object_get_data (G_OBJECT (manager), "freeze-change");
if (is_frozen == NULL)
g_critical (G_STRLOC ": Mismatched thaw; you have to call "
"clutter_layout_manager_freeze_layout_change() prior to "
"calling clutter_layout_manager_thaw_layout_change()");
else
{
guint level = GPOINTER_TO_UINT (is_frozen);
g_assert (level > 0);
CLUTTER_NOTE (LAYOUT, "Thawing changes for manager '%s'[%p]",
G_OBJECT_TYPE_NAME (manager),
manager);
level -= 1;
if (level == 0)
g_object_set_data (G_OBJECT (manager), "freeze-change", NULL);
else
g_object_set_data (G_OBJECT (manager), "freeze-change",
GUINT_TO_POINTER (level));
}
}
static void
layout_manager_real_get_preferred_width (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *nat_width_p)
{
LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_width");
if (min_width_p)
*min_width_p = 0.0;
if (nat_width_p)
*nat_width_p = 0.0;
}
static void
layout_manager_real_get_preferred_height (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *nat_height_p)
{
LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_height");
if (min_height_p)
*min_height_p = 0.0;
if (nat_height_p)
*nat_height_p = 0.0;
}
static void
layout_manager_real_allocate (ClutterLayoutManager *manager,
ClutterContainer *container,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags)
{
LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "allocate");
}
static void
layout_manager_real_set_container (ClutterLayoutManager *manager,
ClutterContainer *container)
{
if (container != NULL)
g_object_set_data (G_OBJECT (container), "clutter-layout-manager", manager);
}
static ClutterLayoutMeta *
layout_manager_real_create_child_meta (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor)
{
ClutterLayoutManagerClass *klass;
GType meta_type;
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
meta_type = klass->get_child_meta_type (manager);
/* provide a default implementation to reduce common code */
if (meta_type != G_TYPE_INVALID)
{
g_assert (g_type_is_a (meta_type, CLUTTER_TYPE_LAYOUT_META));
return g_object_new (meta_type,
"manager", manager,
"container", container,
"actor", actor,
NULL);
}
return NULL;
}
static GType
layout_manager_real_get_child_meta_type (ClutterLayoutManager *manager)
{
return G_TYPE_INVALID;
}
static ClutterAlpha *
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)
{
clutter_alpha_set_mode (alpha, mode);
timeline = clutter_alpha_get_timeline (alpha);
clutter_timeline_set_duration (timeline, duration);
clutter_timeline_rewind (timeline);
return alpha;
};
timeline = clutter_timeline_new (duration);
alpha = clutter_alpha_new_full (timeline, mode);
/* let the alpha take ownership of the timeline */
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);
return alpha;
}
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;
klass->set_container = layout_manager_real_set_container;
/**
* ClutterLayoutManager::layout-changed:
* @manager: the #ClutterLayoutManager that emitted the signal
*
* The ::layout-changed signal is emitted each time a layout manager
* has been changed. Every #ClutterActor using the @manager instance
* as a layout manager should connect a handler to the ::layout-changed
* signal and queue a relayout on themselves:
*
* |[
* static void layout_changed (ClutterLayoutManager *manager,
* ClutterActor *self)
* {
* clutter_actor_queue_relayout (self);
* }
* ...
* self->manager = g_object_ref_sink (manager);
* g_signal_connect (self->manager, "layout-changed",
* G_CALLBACK (layout_changed),
* self);
* ]|
*
* Sub-classes of #ClutterLayoutManager that implement a layout that
* can be controlled or changed using parameters should emit the
* ::layout-changed signal whenever one of the parameters changes,
* by using clutter_layout_manager_layout_changed().
*
* Since: 1.2
*/
manager_signals[LAYOUT_CHANGED] =
g_signal_new (I_("layout-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterLayoutManagerClass,
layout_changed),
NULL, NULL,
_clutter_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
static void
clutter_layout_manager_init (ClutterLayoutManager *manager)
{
}
/**
* clutter_layout_manager_get_preferred_width:
* @manager: a #ClutterLayoutManager
* @container: the #ClutterContainer using @manager
* @for_height: the height for which the width should be computed, or -1
* @min_width_p: (out) (allow-none): return location for the minimum width
* of the layout, or %NULL
* @nat_width_p: (out) (allow-none): return location for the natural width
* of the layout, or %NULL
*
* Computes the minimum and natural widths of the @container according
* to @manager.
*
* See also clutter_actor_get_preferred_width()
*
* Since: 1.2
*/
void
clutter_layout_manager_get_preferred_width (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *nat_width_p)
{
ClutterLayoutManagerClass *klass;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
klass->get_preferred_width (manager, container, for_height,
min_width_p,
nat_width_p);
}
/**
* clutter_layout_manager_get_preferred_height:
* @manager: a #ClutterLayoutManager
* @container: the #ClutterContainer using @manager
* @for_width: the width for which the height should be computed, or -1
* @min_height_p: (out) (allow-none): return location for the minimum height
* of the layout, or %NULL
* @nat_height_p: (out) (allow-none): return location for the natural height
* of the layout, or %NULL
*
* Computes the minimum and natural heights of the @container according
* to @manager.
*
* See also clutter_actor_get_preferred_height()
*
* Since: 1.2
*/
void
clutter_layout_manager_get_preferred_height (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *nat_height_p)
{
ClutterLayoutManagerClass *klass;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
klass->get_preferred_height (manager, container, for_width,
min_height_p,
nat_height_p);
}
/**
* clutter_layout_manager_allocate:
* @manager: a #ClutterLayoutManager
* @container: the #ClutterContainer using @manager
* @allocation: the #ClutterActorBox containing the allocated area
* of @container
* @flags: the allocation flags
*
* Allocates the children of @container given an area
*
* See also clutter_actor_allocate()
*
* Since: 1.2
*/
void
clutter_layout_manager_allocate (ClutterLayoutManager *manager,
ClutterContainer *container,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags)
{
ClutterLayoutManagerClass *klass;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (allocation != NULL);
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
klass->allocate (manager, container, allocation, flags);
}
/**
* clutter_layout_manager_layout_changed:
* @manager: a #ClutterLayoutManager
*
* Emits the #ClutterLayoutManager::layout-changed signal on @manager
*
* This function should only be called by implementations of the
* #ClutterLayoutManager class
*
* Since: 1.2
*/
void
clutter_layout_manager_layout_changed (ClutterLayoutManager *manager)
{
gpointer is_frozen;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
is_frozen = g_object_get_data (G_OBJECT (manager), "freeze-change");
if (is_frozen == NULL)
g_signal_emit (manager, manager_signals[LAYOUT_CHANGED], 0);
else
CLUTTER_NOTE (LAYOUT, "Layout manager '%s'[%p] has been frozen",
G_OBJECT_TYPE_NAME (manager),
manager);
}
/**
* clutter_layout_manager_set_container:
* @manager: a #ClutterLayoutManager
* @container: (allow-none): a #ClutterContainer using @manager
*
* If the #ClutterLayoutManager sub-class allows it, allow
* adding a weak reference of the @container using @manager
* from within the layout manager
*
* The layout manager should not increase the reference
* count of the @container
*
* Since: 1.2
*/
void
clutter_layout_manager_set_container (ClutterLayoutManager *manager,
ClutterContainer *container)
{
ClutterLayoutManagerClass *klass;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (container == NULL || CLUTTER_IS_CONTAINER (container));
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
if (klass->set_container)
klass->set_container (manager, container);
}
GType
_clutter_layout_manager_get_child_meta_type (ClutterLayoutManager *manager)
{
return CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager)->get_child_meta_type (manager);
}
static inline ClutterLayoutMeta *
create_child_meta (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor)
{
ClutterLayoutManagerClass *klass;
ClutterLayoutMeta *meta = NULL;
layout_manager_freeze_layout_change (manager);
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
if (klass->get_child_meta_type (manager) != G_TYPE_INVALID)
meta = klass->create_child_meta (manager, container, actor);
layout_manager_thaw_layout_change (manager);
return meta;
}
static inline ClutterLayoutMeta *
get_child_meta (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor)
{
ClutterLayoutMeta *layout = NULL;
layout = g_object_get_qdata (G_OBJECT (actor), quark_layout_meta);
if (layout != NULL)
{
ClutterChildMeta *child = CLUTTER_CHILD_META (layout);
if (layout->manager == manager &&
child->container == container &&
child->actor == actor)
return layout;
/* if the LayoutMeta referenced is not attached to the
* layout manager then we simply ask the layout manager
* to replace it with the right one
*/
}
layout = create_child_meta (manager, container, actor);
if (layout != NULL)
{
g_assert (CLUTTER_IS_LAYOUT_META (layout));
g_object_set_qdata_full (G_OBJECT (actor), quark_layout_meta,
layout,
(GDestroyNotify) g_object_unref);
return layout;
}
return NULL;
}
/**
* clutter_layout_manager_get_child_meta:
* @manager: a #ClutterLayoutManager
* @container: a #ClutterContainer using @manager
* @actor: a #ClutterActor child of @container
*
* Retrieves the #ClutterLayoutMeta that the layout @manager associated
* to the @actor child of @container, eventually by creating one if the
* #ClutterLayoutManager supports layout properties
*
* Return value: (transfer none): a #ClutterLayoutMeta, or %NULL if the
* #ClutterLayoutManager does not have layout properties. The returned
* layout meta instance is owned by the #ClutterLayoutManager and it
* should not be unreferenced
*
* Since: 1.0
*/
ClutterLayoutMeta *
clutter_layout_manager_get_child_meta (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor)
{
g_return_val_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager), NULL);
g_return_val_if_fail (CLUTTER_IS_CONTAINER (container), NULL);
g_return_val_if_fail (CLUTTER_IS_ACTOR (actor), NULL);
return get_child_meta (manager, container, actor);
}
static inline gboolean
layout_set_property_internal (ClutterLayoutManager *manager,
GObject *gobject,
GParamSpec *pspec,
const GValue *value)
{
if (pspec->flags & G_PARAM_CONSTRUCT_ONLY)
{
g_warning ("%s: Child property '%s' of the layout manager of "
"type '%s' is constructor-only",
G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (manager));
return FALSE;
}
if (!(pspec->flags & G_PARAM_WRITABLE))
{
g_warning ("%s: Child property '%s' of the layout manager of "
"type '%s' is not writable",
G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (manager));
return FALSE;
}
g_object_set_property (gobject, pspec->name, value);
return TRUE;
}
static inline gboolean
layout_get_property_internal (ClutterLayoutManager *manager,
GObject *gobject,
GParamSpec *pspec,
GValue *value)
{
if (!(pspec->flags & G_PARAM_READABLE))
{
g_warning ("%s: Child property '%s' of the layout manager of "
"type '%s' is not readable",
G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (manager));
return FALSE;
}
g_object_get_property (gobject, pspec->name, value);
return TRUE;
}
/**
* clutter_layout_manager_child_set:
* @manager: a #ClutterLayoutManager
* @container: a #ClutterContainer using @manager
* @actor: a #ClutterActor child of @container
* @first_property: the first property name
* @Varargs: a list of property name and value pairs
*
* Sets a list of properties and their values on the #ClutterLayoutMeta
* associated by @manager to a child of @container
*
* Languages bindings should use clutter_layout_manager_child_set_property()
* instead
*
* Since: 1.2
*/
void
clutter_layout_manager_child_set (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor,
const gchar *first_property,
...)
{
ClutterLayoutMeta *meta;
GObjectClass *klass;
const gchar *pname;
va_list var_args;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
g_return_if_fail (first_property != NULL);
meta = get_child_meta (manager, container, actor);
if (meta == NULL)
{
g_warning ("Layout managers of type '%s' do not support "
"layout metadata",
g_type_name (G_OBJECT_TYPE (manager)));
return;
}
klass = G_OBJECT_GET_CLASS (meta);
va_start (var_args, first_property);
pname = first_property;
while (pname)
{
GValue value = { 0, };
GParamSpec *pspec;
gchar *error;
gboolean res;
pspec = g_object_class_find_property (klass, pname);
if (pspec == NULL)
{
g_warning ("%s: Layout managers of type '%s' have no layout "
"property named '%s'",
G_STRLOC, G_OBJECT_TYPE_NAME (manager), pname);
break;
}
#if GLIB_CHECK_VERSION (2, 23, 2)
G_VALUE_COLLECT_INIT (&value, G_PARAM_SPEC_VALUE_TYPE (pspec),
var_args, 0,
&error);
#else
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
G_VALUE_COLLECT (&value, var_args, 0, &error);
#endif /* GLIB_CHECK_VERSION (2, 23, 2) */
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
g_free (error);
break;
}
res = layout_set_property_internal (manager, G_OBJECT (meta),
pspec,
&value);
g_value_unset (&value);
if (!res)
break;
pname = va_arg (var_args, gchar*);
}
va_end (var_args);
}
/**
* clutter_layout_manager_child_set_property:
* @manager: a #ClutterLayoutManager
* @container: a #ClutterContainer using @manager
* @actor: a #ClutterActor child of @container
* @property_name: the name of the property to set
* @value: a #GValue with the value of the property to set
*
* Sets a property on the #ClutterLayoutMeta created by @manager and
* attached to a child of @container
*
* Since: 1.2
*/
void
clutter_layout_manager_child_set_property (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor,
const gchar *property_name,
const GValue *value)
{
ClutterLayoutMeta *meta;
GObjectClass *klass;
GParamSpec *pspec;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
g_return_if_fail (property_name != NULL);
g_return_if_fail (value != NULL);
meta = get_child_meta (manager, container, actor);
if (meta == NULL)
{
g_warning ("Layout managers of type '%s' do not support "
"layout metadata",
g_type_name (G_OBJECT_TYPE (manager)));
return;
}
klass = G_OBJECT_GET_CLASS (meta);
pspec = g_object_class_find_property (klass, property_name);
if (pspec == NULL)
{
g_warning ("%s: Layout managers of type '%s' have no layout "
"property named '%s'",
G_STRLOC, G_OBJECT_TYPE_NAME (manager), property_name);
return;
}
layout_set_property_internal (manager, G_OBJECT (meta), pspec, value);
}
/**
* clutter_layout_manager_child_get:
* @manager: a #ClutterLayoutManager
* @container: a #ClutterContainer using @manager
* @actor: a #ClutterActor child of @container
* @first_property: the name of the first property
* @Varargs: a list of property name and return location for the value pairs
*
* Retrieves the values for a list of properties out of the
* #ClutterLayoutMeta created by @manager and attached to the
* child of a @container
*
* Since: 1.2
*/
void
clutter_layout_manager_child_get (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor,
const gchar *first_property,
...)
{
ClutterLayoutMeta *meta;
GObjectClass *klass;
const gchar *pname;
va_list var_args;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
g_return_if_fail (first_property != NULL);
meta = get_child_meta (manager, container, actor);
if (meta == NULL)
{
g_warning ("Layout managers of type '%s' do not support "
"layout metadata",
g_type_name (G_OBJECT_TYPE (manager)));
return;
}
klass = G_OBJECT_GET_CLASS (meta);
va_start (var_args, first_property);
pname = first_property;
while (pname)
{
GValue value = { 0, };
GParamSpec *pspec;
gchar *error;
gboolean res;
pspec = g_object_class_find_property (klass, pname);
if (pspec == NULL)
{
g_warning ("%s: Layout managers of type '%s' have no layout "
"property named '%s'",
G_STRLOC, G_OBJECT_TYPE_NAME (manager), pname);
break;
}
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
res = layout_get_property_internal (manager, G_OBJECT (meta),
pspec,
&value);
if (!res)
{
g_value_unset (&value);
break;
}
G_VALUE_LCOPY (&value, var_args, 0, &error);
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
g_free (error);
g_value_unset (&value);
break;
}
g_value_unset (&value);
pname = va_arg (var_args, gchar*);
}
va_end (var_args);
}
/**
* clutter_layout_manager_child_get_property:
* @manager: a #ClutterLayoutManager
* @container: a #ClutterContainer using @manager
* @actor: a #ClutterActor child of @container
* @property_name: the name of the property to get
* @value: a #GValue with the value of the property to get
*
* Gets a property on the #ClutterLayoutMeta created by @manager and
* attached to a child of @container
*
* The #GValue must already be initialized to the type of the property
* and has to be unset with g_value_unset() after extracting the real
* value out of it
*
* Since: 1.2
*/
void
clutter_layout_manager_child_get_property (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor,
const gchar *property_name,
GValue *value)
{
ClutterLayoutMeta *meta;
GObjectClass *klass;
GParamSpec *pspec;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
g_return_if_fail (property_name != NULL);
g_return_if_fail (value != NULL);
meta = get_child_meta (manager, container, actor);
if (meta == NULL)
{
g_warning ("Layout managers of type %s do not support "
"layout metadata",
g_type_name (G_OBJECT_TYPE (manager)));
return;
}
klass = G_OBJECT_GET_CLASS (meta);
pspec = g_object_class_find_property (klass, property_name);
if (pspec == NULL)
{
g_warning ("%s: Layout managers of type '%s' have no layout "
"property named '%s'",
G_STRLOC, G_OBJECT_TYPE_NAME (manager), property_name);
return;
}
layout_get_property_internal (manager, G_OBJECT (meta), pspec, value);
}
/**
* clutter_layout_manager_find_child_property:
* @manager: a #ClutterLayoutManager
* @name: the name of the property
*
* Retrieves the #GParamSpec for the layout property @name inside
* the #ClutterLayoutMeta sub-class used by @manager
*
* Return value: (transfer none): a #GParamSpec describing the property,
* or %NULL if no property with that name exists. The returned
* #GParamSpec is owned by the layout manager and should not be
* modified or freed
*
* Since: 1.2
*/
GParamSpec *
clutter_layout_manager_find_child_property (ClutterLayoutManager *manager,
const gchar *name)
{
ClutterLayoutManagerClass *klass;
GObjectClass *meta_klass;
GParamSpec *pspec;
GType meta_type;
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
meta_type = klass->get_child_meta_type (manager);
if (meta_type == G_TYPE_INVALID)
return NULL;
meta_klass = g_type_class_ref (meta_type);
pspec = g_object_class_find_property (meta_klass, name);
g_type_class_unref (meta_klass);
return pspec;
}
/**
* clutter_layout_manager_list_child_properties:
* @manager: a #ClutterLayoutManager
* @n_pspecs: (out): return location for the number of returned
* #GParamSpec<!-- -->s
*
* Retrieves all the #GParamSpec<!-- -->s for the layout properties
* stored inside the #ClutterLayoutMeta sub-class used by @manager
*
* Return value: (transfer full) (array length=n_pspecs): the newly-allocated,
* %NULL-terminated array of #GParamSpec<!-- -->s. Use g_free() to free the
* resources allocated for the array
*
* Since: 1.2
*/
GParamSpec **
clutter_layout_manager_list_child_properties (ClutterLayoutManager *manager,
guint *n_pspecs)
{
ClutterLayoutManagerClass *klass;
GObjectClass *meta_klass;
GParamSpec **pspecs;
GType meta_type;
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
meta_type = klass->get_child_meta_type (manager);
if (meta_type == G_TYPE_INVALID)
return NULL;
meta_klass = g_type_class_ref (meta_type);
pspecs = g_object_class_list_properties (meta_klass, n_pspecs);
g_type_class_unref (meta_klass);
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
*
* Return value: (transfer none): The #ClutterAlpha created by the
* layout manager; the returned instance is owned by the layout
* manager and should not be unreferenced
*
* Since: 1.2
*/
ClutterAlpha *
clutter_layout_manager_begin_animation (ClutterLayoutManager *manager,
guint duration,
gulong mode)
{
ClutterLayoutManagerClass *klass;
g_return_val_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager), NULL);
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
return klass->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);
}
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