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mutter-performance-source/clutter/clutter-box.c
Emmanuele Bassi 15a04a1dd3 layout-manager: Create LayoutMeta on demand 
The ClutterLayoutMeta instances should be created on demand, whenever
the layout manager needs them - if the layout manager supports layout
properties.

This removes the requirement to call add_child_meta() and
remove_child_meta() on add and remove respectively; it also simplifies
the implementation of LayoutManager sub-classes since we can add
fallback code in the base abstract class.

Eventually, this will also lead to an easier to implement ClutterScript
parser for layout properties.

With the new scheme, the ClutterLayoutMeta instance is created whenever
the layout manager tries to access it; if there isn't an instance
already attached to the container's child, one is created -- assuming
that the LayoutManager sub-class has overridden the
get_child_meta_type() virtual function and it's returning a valid GType.

We can also provide a default implementation for create_child_meta(),
by getting the GType and instantiating a ClutterLayoutMeta with all the
fields already set. If the layout manager requires more work then it can
obviously override the default implementation (and even chain up to it).

The ClutterBox actor has been updated, as well as the ClutterBoxLayout
layout manager, to take advantage of the changes of LayoutManager.
2009-11-30 19:11:00 +00:00

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/**
* SECTION:clutter-box
* @short_description: A Generic layout container
*
* #ClutterBox is a #ClutterActor sub-class implementing the #ClutterContainer
* interface. A Box delegates the whole size requisition and size allocation to
* a #ClutterLayoutManager instance.
*
* <example id="example-clutter-box">
* <title>Using ClutterBox</title>
* <para>The following code shows how to create a #ClutterBox with
* a #ClutterLayoutManager sub-class, and how to add children to
* it via clutter_box_pack().</para>
* <programlisting>
* ClutterActor *box;
* ClutterLayoutManager *layout;
*
* /&ast; Create the layout manager first &ast;/
* layout = clutter_box_layout_new ();
* clutter_box_layout_set_homogeneous (CLUTTER_BOX_LAYOUT (layout), TRUE);
* clutter_box_layout_set_spacing (CLUTTER_BOX_LAYOUT (layout), 12);
*
* /&ast; Then create the ClutterBox actor. The Box will take
* &ast; ownership of the ClutterLayoutManager instance by sinking
* &ast; its floating reference
* &ast;/
* box = clutter_box_new (layout);
*
* /&ast; Now add children to the Box using the variadic arguments
* &ast; function clutter_box_pack() to set layout properties
* &ast;/
* clutter_box_pack (CLUTTER_BOX (box), actor,
* "x-align", CLUTTER_BOX_ALIGNMENT_CENTER,
* "y-align", CLUTTER_BOX_ALIGNMENT_END,
* "expand", TRUE,
* NULL);
* </programlisting>
* </example>
*
* #ClutterBox<!-- -->'s clutter_box_pack() wraps the generic
* clutter_container_add_actor() function, but it also allows setting
* layout properties while adding the new child to the box.
*
* #ClutterBox is available since Clutter 1.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib-object.h>
#include <gobject/gvaluecollector.h>
#include "clutter-box.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
#define CLUTTER_BOX_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_BOX, ClutterBoxPrivate))
struct _ClutterBoxPrivate
{
ClutterLayoutManager *manager;
GList *children;
guint changed_id;
ClutterColor color;
guint color_set : 1;
};
enum
{
PROP_0,
PROP_LAYOUT_MANAGER,
PROP_COLOR,
PROP_COLOR_SET
};
static const ClutterColor default_box_color = { 255, 255, 255, 255 };
static void clutter_container_iface_init (ClutterContainerIface *iface);
G_DEFINE_TYPE_WITH_CODE (ClutterBox, clutter_box, CLUTTER_TYPE_ACTOR,
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_CONTAINER,
clutter_container_iface_init));
static gint
sort_by_depth (gconstpointer a,
gconstpointer b)
{
gfloat depth_a = clutter_actor_get_depth ((ClutterActor *) a);
gfloat depth_b = clutter_actor_get_depth ((ClutterActor *) b);
if (depth_a < depth_b)
return -1;
if (depth_a > depth_b)
return 1;
return 0;
}
static void
clutter_box_real_add (ClutterContainer *container,
ClutterActor *actor)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (container)->priv;
g_object_ref (actor);
priv->children = g_list_insert_sorted (priv->children,
actor,
sort_by_depth);
clutter_actor_set_parent (actor, CLUTTER_ACTOR (container));
clutter_actor_queue_relayout (actor);
g_signal_emit_by_name (container, "actor-added", actor);
g_object_unref (actor);
}
static void
clutter_box_real_remove (ClutterContainer *container,
ClutterActor *actor)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (container)->priv;
g_object_ref (actor);
priv->children = g_list_remove (priv->children, actor);
clutter_actor_unparent (actor);
clutter_actor_queue_relayout (CLUTTER_ACTOR (container));
g_signal_emit_by_name (container, "actor-removed", actor);
g_object_unref (actor);
}
static void
clutter_box_real_foreach (ClutterContainer *container,
ClutterCallback callback,
gpointer user_data)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (container)->priv;
GList *l;
for (l = priv->children; l != NULL; l = l->next)
(* callback) (l->data, user_data);
}
static void
clutter_box_real_raise (ClutterContainer *container,
ClutterActor *actor,
ClutterActor *sibling)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (container)->priv;
priv->children = g_list_remove (priv->children, actor);
if (sibling == NULL)
priv->children = g_list_append (priv->children, actor);
else
{
gint index_ = g_list_index (priv->children, sibling) + 1;
priv->children = g_list_insert (priv->children, actor, index_);
}
clutter_actor_queue_relayout (CLUTTER_ACTOR (container));
}
static void
clutter_box_real_lower (ClutterContainer *container,
ClutterActor *actor,
ClutterActor *sibling)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (container)->priv;
priv->children = g_list_remove (priv->children, actor);
if (sibling == NULL)
priv->children = g_list_prepend (priv->children, actor);
else
{
gint index_ = g_list_index (priv->children, sibling);
priv->children = g_list_insert (priv->children, actor, index_);
}
clutter_actor_queue_relayout (CLUTTER_ACTOR (container));
}
static void
clutter_box_real_sort_depth_order (ClutterContainer *container)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (container)->priv;
priv->children = g_list_sort (priv->children, sort_by_depth);
clutter_actor_queue_relayout (CLUTTER_ACTOR (container));
}
static void
clutter_container_iface_init (ClutterContainerIface *iface)
{
iface->add = clutter_box_real_add;
iface->remove = clutter_box_real_remove;
iface->foreach = clutter_box_real_foreach;
iface->raise = clutter_box_real_raise;
iface->lower = clutter_box_real_lower;
iface->sort_depth_order = clutter_box_real_sort_depth_order;
}
static void
clutter_box_real_paint (ClutterActor *actor)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (actor)->priv;
if (priv->color_set)
{
ClutterActorBox box = { 0, };
gfloat width, height;
guint8 tmp_alpha;
clutter_actor_get_allocation_box (actor, &box);
clutter_actor_box_get_size (&box, &width, &height);
tmp_alpha = clutter_actor_get_paint_opacity (actor)
* priv->color.alpha
/ 255;
cogl_set_source_color4ub (priv->color.red,
priv->color.green,
priv->color.blue,
tmp_alpha);
cogl_rectangle (0, 0, width, height);
}
g_list_foreach (priv->children, (GFunc) clutter_actor_paint, NULL);
}
static void
clutter_box_real_pick (ClutterActor *actor,
const ClutterColor *pick)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (actor)->priv;
CLUTTER_ACTOR_CLASS (clutter_box_parent_class)->pick (actor, pick);
g_list_foreach (priv->children, (GFunc) clutter_actor_paint, NULL);
}
static void
clutter_box_real_get_preferred_width (ClutterActor *actor,
gfloat for_height,
gfloat *min_width,
gfloat *natural_width)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (actor)->priv;
/* if we don't have any children don't bother proxying the
* call to the layout manager instance
*/
if (priv->children == NULL || priv->manager == NULL)
{
if (min_width)
*min_width = 0.0;
if (natural_width)
*natural_width = 0.0;
return;
}
clutter_layout_manager_get_preferred_width (priv->manager,
CLUTTER_CONTAINER (actor),
for_height,
min_width, natural_width);
}
static void
clutter_box_real_get_preferred_height (ClutterActor *actor,
gfloat for_width,
gfloat *min_height,
gfloat *natural_height)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (actor)->priv;
/* if we don't have any children don't bother proxying the
* call to the layout manager instance
*/
if (priv->children == NULL || priv->manager == NULL)
{
if (min_height)
*min_height = 0.0;
if (natural_height)
*natural_height = 0.0;
return;
}
clutter_layout_manager_get_preferred_height (priv->manager,
CLUTTER_CONTAINER (actor),
for_width,
min_height, natural_height);
}
static void
clutter_box_real_allocate (ClutterActor *actor,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (actor)->priv;
ClutterActorClass *klass;
klass = CLUTTER_ACTOR_CLASS (clutter_box_parent_class);
klass->allocate (actor, allocation, flags);
if (priv->children == NULL || priv->manager == NULL)
return;
clutter_layout_manager_allocate (priv->manager,
CLUTTER_CONTAINER (actor),
allocation, flags);
}
static void
clutter_box_destroy (ClutterActor *actor)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (actor)->priv;
/* destroy all our children */
g_list_foreach (priv->children, (GFunc) clutter_actor_destroy, NULL);
if (CLUTTER_ACTOR_CLASS (clutter_box_parent_class)->destroy)
CLUTTER_ACTOR_CLASS (clutter_box_parent_class)->destroy (actor);
}
static inline void
set_layout_manager (ClutterBox *self,
ClutterLayoutManager *manager)
{
ClutterBoxPrivate *priv = self->priv;
if (priv->manager == manager)
return;
if (priv->manager != NULL)
{
if (priv->changed_id != 0)
g_signal_handler_disconnect (priv->manager, priv->changed_id);
clutter_layout_manager_set_container (priv->manager, NULL);
g_object_unref (priv->manager);
priv->manager = NULL;
priv->changed_id = 0;
}
if (manager != NULL)
{
priv->manager = g_object_ref_sink (manager);
clutter_layout_manager_set_container (manager,
CLUTTER_CONTAINER (self));
priv->changed_id =
g_signal_connect_swapped (priv->manager, "layout-changed",
G_CALLBACK (clutter_actor_queue_relayout),
self);
}
clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
g_object_notify (G_OBJECT (self), "layout-manager");
}
static void
clutter_box_dispose (GObject *gobject)
{
ClutterBox *self = CLUTTER_BOX (gobject);
set_layout_manager (self, NULL);
G_OBJECT_CLASS (clutter_box_parent_class)->dispose (gobject);
}
static void
clutter_box_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBox *self = CLUTTER_BOX (gobject);
switch (prop_id)
{
case PROP_LAYOUT_MANAGER:
set_layout_manager (self, g_value_get_object (value));
break;
case PROP_COLOR:
clutter_box_set_color (self, clutter_value_get_color (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBoxPrivate *priv = CLUTTER_BOX (gobject)->priv;
switch (prop_id)
{
case PROP_LAYOUT_MANAGER:
g_value_set_object (value, priv->manager);
break;
case PROP_COLOR:
clutter_value_set_color (value, &priv->color);
break;
case PROP_COLOR_SET:
g_value_set_boolean (value, priv->color_set);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_class_init (ClutterBoxClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
GParamSpec *pspec;
g_type_class_add_private (klass, sizeof (ClutterBoxPrivate));
actor_class->get_preferred_width = clutter_box_real_get_preferred_width;
actor_class->get_preferred_height = clutter_box_real_get_preferred_height;
actor_class->allocate = clutter_box_real_allocate;
actor_class->paint = clutter_box_real_paint;
actor_class->pick = clutter_box_real_pick;
actor_class->destroy = clutter_box_destroy;
gobject_class->set_property = clutter_box_set_property;
gobject_class->get_property = clutter_box_get_property;
gobject_class->dispose = clutter_box_dispose;
/**
* ClutterBox:layout-manager:
*
* The #ClutterLayoutManager used by the #ClutterBox
*
* Since: 1.2
*/
pspec = g_param_spec_object ("layout-manager",
"Layout Manager",
"The layout manager used by the box",
CLUTTER_TYPE_LAYOUT_MANAGER,
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT);
g_object_class_install_property (gobject_class,
PROP_LAYOUT_MANAGER,
pspec);
/**
* ClutterBox:color:
*
* The color to be used to paint the background of the
* #ClutterBox. Setting this property will set the
* #ClutterBox:color-set property as a side effect
*
* Since: 1.2
*/
pspec = clutter_param_spec_color ("color",
"Color",
"The background color of the box",
&default_box_color,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_COLOR, pspec);
/**
* ClutterBox:color-set:
*
* Whether the #ClutterBox:color property has been set
*
* Since: 1.2
*/
pspec = g_param_spec_boolean ("color-set",
"Color Set",
"Whether the background color is set",
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_COLOR_SET, pspec);
}
static void
clutter_box_init (ClutterBox *self)
{
self->priv = CLUTTER_BOX_GET_PRIVATE (self);
self->priv->color = default_box_color;
}
/**
* clutter_box_new:
* @manager: a #ClutterLayoutManager
*
* Creates a new #ClutterBox. The children of the box will be layed
* out by the passed @manager
*
* Return value: the newly created #ClutterBox actor
*
* Since: 1.0
*/
ClutterActor *
clutter_box_new (ClutterLayoutManager *manager)
{
g_return_val_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager), NULL);
return g_object_new (CLUTTER_TYPE_BOX,
"layout-manager", manager,
NULL);
}
/**
* clutter_box_set_layout_manager:
* @box: a #ClutterBox
* @manager: a #ClutterLayoutManager
*
* Sets the #ClutterLayoutManager for @box
*
* A #ClutterLayoutManager is a delegate object that controls the
* layout of the children of @box
*
* Since: 1.2
*/
void
clutter_box_set_layout_manager (ClutterBox *box,
ClutterLayoutManager *manager)
{
g_return_if_fail (CLUTTER_IS_BOX (box));
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
set_layout_manager (box, manager);
}
/**
* clutter_box_get_layout_manager:
* @box: a #ClutterBox
*
* Retrieves the #ClutterLayoutManager instance used by @box
*
* Return value: a #ClutterLayoutManager
*
* Since: 1.2
*/
ClutterLayoutManager *
clutter_box_get_layout_manager (ClutterBox *box)
{
g_return_val_if_fail (CLUTTER_IS_BOX (box), NULL);
return box->priv->manager;
}
/**
* clutter_box_packv:
* @box: a #ClutterBox
* @actor: a #ClutterActor
* @n_properties: the number of properties to set
* @properties: (array length=n_properties) (element-type utf8): a vector
* containing the property names to set
* @values: (array length=n_properties): a vector containing the property
* values to set
*
* Vector-based variant of clutter_box_pack(), intended for language
* bindings to use
*
* Since: 1.2
*/
void
clutter_box_packv (ClutterBox *box,
ClutterActor *actor,
guint n_properties,
const gchar * const properties[],
const GValue *values)
{
ClutterContainer *container;
ClutterBoxPrivate *priv;
ClutterLayoutMeta *meta;
GObjectClass *klass;
gint i;
g_return_if_fail (CLUTTER_IS_BOX (box));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
container = CLUTTER_CONTAINER (box);
clutter_container_add_actor (container, actor);
priv = box->priv;
meta = clutter_layout_manager_get_child_meta (priv->manager,
container,
actor);
if (meta == NULL)
return;
klass = G_OBJECT_GET_CLASS (meta);
for (i = 0; i < n_properties; i++)
{
const gchar *pname = properties[i];
GParamSpec *pspec;
pspec = g_object_class_find_property (klass, pname);
if (pspec == NULL)
{
g_warning ("%s: the layout property '%s' for managers "
"of type '%s' (meta type '%s') does not exist",
G_STRLOC,
pname,
G_OBJECT_TYPE_NAME (priv->manager),
G_OBJECT_TYPE_NAME (meta));
break;
}
if (!(pspec->flags & G_PARAM_WRITABLE))
{
g_warning ("%s: the layout property '%s' for managers "
"of type '%s' (meta type '%s') is not writable",
G_STRLOC,
pspec->name,
G_OBJECT_TYPE_NAME (priv->manager),
G_OBJECT_TYPE_NAME (meta));
break;
}
clutter_layout_manager_child_set_property (priv->manager,
container, actor,
pname, &values[i]);
}
}
/**
* clutter_box_pack:
* @box: a #ClutterBox
* @actor: a #ClutterActor
* @first_property: the name of the first property to set, or %NULL
* @Varargs: a list of property name and value pairs, terminated by %NULL
*
* Adds @actor to @box and sets layout properties at the same time,
* if the #ClutterLayoutManager used by @box has them
*
* This function is a wrapper around clutter_container_add_actor()
* and clutter_layout_manager_child_set()
*
* Language bindings should use the vector-based clutter_box_addv()
* variant instead
*
* Since: 1.2
*/
void
clutter_box_pack (ClutterBox *box,
ClutterActor *actor,
const gchar *first_property,
...)
{
ClutterBoxPrivate *priv;
ClutterContainer *container;
ClutterLayoutMeta *meta;
GObjectClass *klass;
const gchar *pname;
va_list var_args;
g_return_if_fail (CLUTTER_IS_BOX (box));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
container = CLUTTER_CONTAINER (box);
clutter_container_add_actor (container, actor);
if (first_property == NULL || *first_property == '\0')
return;
priv = box->priv;
meta = clutter_layout_manager_get_child_meta (priv->manager,
container,
actor);
if (meta == NULL)
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;
pspec = g_object_class_find_property (klass, pname);
if (pspec == NULL)
{
g_warning ("%s: the layout property '%s' for managers "
"of type '%s' (meta type '%s') does not exist",
G_STRLOC,
pname,
G_OBJECT_TYPE_NAME (priv->manager),
G_OBJECT_TYPE_NAME (meta));
break;
}
if (!(pspec->flags & G_PARAM_WRITABLE))
{
g_warning ("%s: the layout property '%s' for managers "
"of type '%s' (meta type '%s') is not writable",
G_STRLOC,
pspec->name,
G_OBJECT_TYPE_NAME (priv->manager),
G_OBJECT_TYPE_NAME (meta));
break;
}
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
G_VALUE_COLLECT (&value, var_args, 0, &error);
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
g_free (error);
break;
}
clutter_layout_manager_child_set_property (priv->manager,
container, actor,
pspec->name, &value);
g_value_unset (&value);
pname = va_arg (var_args, gchar*);
}
va_end (var_args);
}
/**
* clutter_box_set_color:
* @box: a #ClutterBox
* @color: (allow-none): the background color, or %NULL to unset
*
* Sets (or unsets) the background color for @box
*
* Since: 1.2
*/
void
clutter_box_set_color (ClutterBox *box,
const ClutterColor *color)
{
ClutterBoxPrivate *priv;
g_return_if_fail (CLUTTER_IS_BOX (box));
priv = box->priv;
if (color)
{
priv->color = *color;
priv->color_set = TRUE;
}
else
priv->color_set = FALSE;
clutter_actor_queue_redraw (CLUTTER_ACTOR (box));
g_object_notify (G_OBJECT (box), "color-set");
g_object_notify (G_OBJECT (box), "color");
}
/**
* clutter_box_get_color:
* @box: a #ClutterBox
* @color: (out): return location for a #ClutterColor
*
* Retrieves the background color of @box
*
* If the #ClutterBox:color-set property is set to %FALSE the
* returned #ClutterColor is undefined
*
* Since: 1.2
*/
void
clutter_box_get_color (ClutterBox *box,
ClutterColor *color)
{
g_return_if_fail (CLUTTER_IS_BOX (box));
g_return_if_fail (color != NULL);
*color = box->priv->color;
}
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