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mutter/clutter/clutter-bin-layout.c
Emmanuele Bassi 9c9ab42060 Begin porting layout managers to the new child iteration API 
Instead of getting the list of children to iterate over it, let's use
the newly added child iteration API; this should save us a bunch of
allocations, as well as indirections.

Ported: ClutterBinLayout and ClutterBoxLayout.
2012-01-16 23:37:09 +00:00

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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-bin-layout
* @short_description: A simple layout manager
*
* #ClutterBinLayout is a layout manager which implements the following
* policy:
*
* <itemizedlist>
* <listitem><simpara>the preferred size is the maximum preferred size
* between all the children of the container using the
* layout;</simpara></listitem>
* <listitem><simpara>each child is allocated in "layers", on on top
* of the other;</simpara></listitem>
* <listitem><simpara>for each layer there are horizontal and vertical
* alignment policies.</simpara></listitem>
* </itemizedlist>
*
* <figure id="bin-layout">
* <title>Bin layout</title>
* <para>The image shows a #ClutterBinLayout with three layers:
* a background #ClutterCairoTexture, set to fill on both the X
* and Y axis; a #ClutterTexture, set to center on both the X and
* Y axis; and a #ClutterRectangle, set to %CLUTTER_BIN_ALIGNMENT_END
* on both the X and Y axis.</para>
* <graphic fileref="bin-layout.png" format="PNG"/>
* </figure>
*
* <example id="example-clutter-bin-layout">
* <title>How to pack actors inside a BinLayout</title>
* <para>The following code shows how to build a composite actor with
* a texture and a background, and add controls overlayed on top. The
* background is set to fill the whole allocation, whilst the texture
* is centered; there is a control in the top right corner and a label
* in the bottom, filling out the whole allocated width.</para>
* <programlisting>
* ClutterLayoutManager *manager;
* ClutterActor *box;
*
* /&ast; create the layout first &ast;/
* layout = clutter_bin_layout_new (CLUTTER_BIN_ALIGNMENT_CENTER,
* CLUTTER_BIN_ALIGNMENT_CENTER);
* box = clutter_box_new (layout); /&ast; then the container &ast;/
*
* /&ast; we can use the layout object to add actors &ast;/
* clutter_bin_layout_add (CLUTTER_BIN_LAYOUT (layout), background,
* CLUTTER_BIN_ALIGNMENT_FILL,
* CLUTTER_BIN_ALIGNMENT_FILL);
* clutter_bin_layout_add (CLUTTER_BIN_LAYOUT (layout), icon,
* CLUTTER_BIN_ALIGNMENT_CENTER,
* CLUTTER_BIN_ALIGNMENT_CENTER);
*
* /&ast; align to the bottom left &ast;/
* clutter_bin_layout_add (CLUTTER_BIN_LAYOUT (layout), label,
* CLUTTER_BIN_ALIGNMENT_START,
* CLUTTER_BIN_ALIGNMENT_END);
* /&ast; align to the top right &ast;/
* clutter_bin_layout_add (CLUTTER_BIN_LAYOUT (layout), button,
* CLUTTER_BIN_ALIGNMENT_END,
* CLUTTER_BIN_ALIGNMENT_START);
* </programlisting>
* </example>
*
* #ClutterBinLayout is available since Clutter 1.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include "clutter-actor.h"
#include "clutter-animatable.h"
#include "clutter-bin-layout.h"
#include "clutter-child-meta.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-layout-meta.h"
#include "clutter-private.h"
#define CLUTTER_TYPE_BIN_LAYER (clutter_bin_layer_get_type ())
#define CLUTTER_BIN_LAYER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_BIN_LAYER, ClutterBinLayer))
#define CLUTTER_IS_BIN_LAYER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_BIN_LAYER))
#define CLUTTER_BIN_LAYOUT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_BIN_LAYOUT, ClutterBinLayoutPrivate))
typedef struct _ClutterBinLayer ClutterBinLayer;
typedef struct _ClutterLayoutMetaClass ClutterBinLayerClass;
struct _ClutterBinLayoutPrivate
{
ClutterBinAlignment x_align;
ClutterBinAlignment y_align;
ClutterContainer *container;
};
struct _ClutterBinLayer
{
ClutterLayoutMeta parent_instance;
ClutterBinAlignment x_align;
ClutterBinAlignment y_align;
};
enum
{
PROP_LAYER_0,
PROP_LAYER_X_ALIGN,
PROP_LAYER_Y_ALIGN,
PROP_LAYER_LAST
};
enum
{
PROP_0,
PROP_X_ALIGN,
PROP_Y_ALIGN,
PROP_LAST
};
static GParamSpec *layer_props[PROP_LAYER_LAST] = { NULL, };
static GParamSpec *bin_props[PROP_LAST] = { NULL, };
G_DEFINE_TYPE (ClutterBinLayer,
clutter_bin_layer,
CLUTTER_TYPE_LAYOUT_META);
G_DEFINE_TYPE (ClutterBinLayout,
clutter_bin_layout,
CLUTTER_TYPE_LAYOUT_MANAGER);
/*
* ClutterBinLayer
*/
static void
set_layer_x_align (ClutterBinLayer *self,
ClutterBinAlignment alignment)
{
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
if (self->x_align == alignment)
return;
self->x_align = alignment;
meta = CLUTTER_LAYOUT_META (self);
manager = clutter_layout_meta_get_manager (meta);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (self), layer_props[PROP_LAYER_X_ALIGN]);
}
static void
set_layer_y_align (ClutterBinLayer *self,
ClutterBinAlignment alignment)
{
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
if (self->y_align == alignment)
return;
self->y_align = alignment;
meta = CLUTTER_LAYOUT_META (self);
manager = clutter_layout_meta_get_manager (meta);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (self), layer_props[PROP_LAYER_Y_ALIGN]);
}
static void
clutter_bin_layer_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBinLayer *layer = CLUTTER_BIN_LAYER (gobject);
switch (prop_id)
{
case PROP_LAYER_X_ALIGN:
set_layer_x_align (layer, g_value_get_enum (value));
break;
case PROP_LAYER_Y_ALIGN:
set_layer_y_align (layer, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_bin_layer_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBinLayer *layer = CLUTTER_BIN_LAYER (gobject);
switch (prop_id)
{
case PROP_LAYER_X_ALIGN:
g_value_set_enum (value, layer->x_align);
break;
case PROP_LAYER_Y_ALIGN:
g_value_set_enum (value, layer->y_align);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_bin_layer_class_init (ClutterBinLayerClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = clutter_bin_layer_set_property;
gobject_class->get_property = clutter_bin_layer_get_property;
layer_props[PROP_LAYER_X_ALIGN] =
g_param_spec_enum ("x-align",
P_("Horizontal Alignment"),
P_("Horizontal alignment for the actor "
"inside the layout manager"),
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
layer_props[PROP_LAYER_Y_ALIGN] =
g_param_spec_enum ("y-align",
P_("Vertical Alignment"),
P_("Vertical alignment for the actor "
"inside the layout manager"),
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
g_object_class_install_properties (gobject_class,
PROP_LAYER_LAST,
layer_props);
}
static void
clutter_bin_layer_init (ClutterBinLayer *layer)
{
layer->x_align = CLUTTER_BIN_ALIGNMENT_CENTER;
layer->y_align = CLUTTER_BIN_ALIGNMENT_CENTER;
}
/*
* ClutterBinLayout
*/
static void
set_x_align (ClutterBinLayout *self,
ClutterBinAlignment alignment)
{
ClutterBinLayoutPrivate *priv = self->priv;
if (priv->x_align != alignment)
{
ClutterLayoutManager *manager;
priv->x_align = alignment;
manager = CLUTTER_LAYOUT_MANAGER (self);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (self), bin_props[PROP_X_ALIGN]);
}
}
static void
set_y_align (ClutterBinLayout *self,
ClutterBinAlignment alignment)
{
ClutterBinLayoutPrivate *priv = self->priv;
if (priv->y_align != alignment)
{
ClutterLayoutManager *manager;
priv->y_align = alignment;
manager = CLUTTER_LAYOUT_MANAGER (self);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (self), bin_props[PROP_Y_ALIGN]);
}
}
static void
clutter_bin_layout_get_preferred_width (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *nat_width_p)
{
ClutterActor *actor = CLUTTER_ACTOR (container);
ClutterActor *child;
gfloat min_width, nat_width;
min_width = nat_width = 0.0;
for (child = clutter_actor_get_first_child (actor);
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
gfloat minimum, natural;
clutter_actor_get_preferred_width (child, for_height,
&minimum,
&natural);
min_width = MAX (min_width, minimum);
nat_width = MAX (nat_width, natural);
}
if (min_width_p)
*min_width_p = min_width;
if (nat_width_p)
*nat_width_p = nat_width;
}
static void
clutter_bin_layout_get_preferred_height (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *nat_height_p)
{
ClutterActor *actor = CLUTTER_ACTOR (container);
ClutterActor *child;
gfloat min_height, nat_height;
min_height = nat_height = 0.0;
for (child = clutter_actor_get_first_child (actor);
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
gfloat minimum, natural;
clutter_actor_get_preferred_height (child, for_width,
&minimum,
&natural);
min_height = MAX (min_height, minimum);
nat_height = MAX (nat_height, natural);
}
if (min_height_p)
*min_height_p = min_height;
if (nat_height_p)
*nat_height_p = nat_height;
}
static gdouble
get_bin_alignment_factor (ClutterBinAlignment alignment)
{
switch (alignment)
{
case CLUTTER_BIN_ALIGNMENT_CENTER:
return 0.5;
case CLUTTER_BIN_ALIGNMENT_START:
return 0.0;
case CLUTTER_BIN_ALIGNMENT_END:
return 1.0;
case CLUTTER_BIN_ALIGNMENT_FIXED:
case CLUTTER_BIN_ALIGNMENT_FILL:
return 0.0;
}
return 0.0;
}
static void
clutter_bin_layout_allocate (ClutterLayoutManager *manager,
ClutterContainer *container,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags)
{
gfloat allocation_x, allocation_y;
gfloat available_w, available_h;
ClutterActor *actor, *child;
clutter_actor_box_get_origin (allocation, &allocation_x, &allocation_y);
clutter_actor_box_get_size (allocation, &available_w, &available_h);
actor = CLUTTER_ACTOR (container);
for (child = clutter_actor_get_first_child (actor);
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
ClutterLayoutMeta *meta;
ClutterBinLayer *layer;
ClutterActorBox child_alloc = { 0, };
gdouble x_align, y_align;
gboolean x_fill, y_fill;
meta = clutter_layout_manager_get_child_meta (manager,
container,
child);
layer = CLUTTER_BIN_LAYER (meta);
if (layer->x_align == CLUTTER_BIN_ALIGNMENT_FIXED)
child_alloc.x1 = clutter_actor_get_x (child);
else
child_alloc.x1 = allocation_x;
if (layer->y_align == CLUTTER_BIN_ALIGNMENT_FIXED)
child_alloc.y1 = clutter_actor_get_y (child);
else
child_alloc.y1 = allocation_y;
child_alloc.x2 = available_w;
child_alloc.y2 = available_h;
x_fill = (layer->x_align == CLUTTER_BIN_ALIGNMENT_FILL);
y_fill = (layer->y_align == CLUTTER_BIN_ALIGNMENT_FILL);
x_align = get_bin_alignment_factor (layer->x_align);
y_align = get_bin_alignment_factor (layer->y_align);
clutter_actor_allocate_align_fill (child, &child_alloc,
x_align, y_align,
x_fill, y_fill,
flags);
}
}
static GType
clutter_bin_layout_get_child_meta_type (ClutterLayoutManager *manager)
{
return CLUTTER_TYPE_BIN_LAYER;
}
static ClutterLayoutMeta *
clutter_bin_layout_create_child_meta (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor)
{
ClutterBinLayoutPrivate *priv;
priv = CLUTTER_BIN_LAYOUT (manager)->priv;
return g_object_new (CLUTTER_TYPE_BIN_LAYER,
"container", container,
"actor", actor,
"manager", manager,
"x-align", priv->x_align,
"y_align", priv->y_align,
NULL);
}
static void
clutter_bin_layout_set_container (ClutterLayoutManager *manager,
ClutterContainer *container)
{
ClutterBinLayoutPrivate *priv;
ClutterLayoutManagerClass *parent_class;
priv = CLUTTER_BIN_LAYOUT (manager)->priv;
priv->container = container;
parent_class = CLUTTER_LAYOUT_MANAGER_CLASS (clutter_bin_layout_parent_class);
parent_class->set_container (manager, container);
}
static void
clutter_bin_layout_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBinLayout *layout = CLUTTER_BIN_LAYOUT (gobject);
switch (prop_id)
{
case PROP_X_ALIGN:
set_x_align (layout, g_value_get_enum (value));
break;
case PROP_Y_ALIGN:
set_y_align (layout, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_bin_layout_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBinLayoutPrivate *priv;
priv = CLUTTER_BIN_LAYOUT (gobject)->priv;
switch (prop_id)
{
case PROP_X_ALIGN:
g_value_set_enum (value, priv->x_align);
break;
case PROP_Y_ALIGN:
g_value_set_enum (value, priv->y_align);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_bin_layout_class_init (ClutterBinLayoutClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterLayoutManagerClass *layout_class =
CLUTTER_LAYOUT_MANAGER_CLASS (klass);
g_type_class_add_private (klass, sizeof (ClutterBinLayoutPrivate));
/**
* ClutterBinLayout:x-align:
*
* The default horizontal alignment policy for actors managed
* by the #ClutterBinLayout
*
* Since: 1.2
*/
bin_props[PROP_X_ALIGN] =
g_param_spec_enum ("x-align",
P_("Horizontal Alignment"),
P_("Default horizontal alignment for the actors "
"inside the layout manager"),
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
/**
* ClutterBinLayout:y-align:
*
* The default vertical alignment policy for actors managed
* by the #ClutterBinLayout
*
* Since: 1.2
*/
bin_props[PROP_Y_ALIGN] =
g_param_spec_enum ("y-align",
P_("Vertical Alignment"),
P_("Default vertical alignment for the actors "
"inside the layout manager"),
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
gobject_class->set_property = clutter_bin_layout_set_property;
gobject_class->get_property = clutter_bin_layout_get_property;
g_object_class_install_properties (gobject_class,
PROP_LAST,
bin_props);
layout_class->get_preferred_width =
clutter_bin_layout_get_preferred_width;
layout_class->get_preferred_height =
clutter_bin_layout_get_preferred_height;
layout_class->allocate =
clutter_bin_layout_allocate;
layout_class->create_child_meta =
clutter_bin_layout_create_child_meta;
layout_class->get_child_meta_type =
clutter_bin_layout_get_child_meta_type;
layout_class->set_container =
clutter_bin_layout_set_container;
}
static void
clutter_bin_layout_init (ClutterBinLayout *self)
{
self->priv = CLUTTER_BIN_LAYOUT_GET_PRIVATE (self);
self->priv->x_align = CLUTTER_BIN_ALIGNMENT_CENTER;
self->priv->y_align = CLUTTER_BIN_ALIGNMENT_CENTER;
}
/**
* clutter_bin_layout_new:
* @x_align: the default alignment policy to be used on the
* horizontal axis
* @y_align: the default alignment policy to be used on the
* vertical axis
*
* Creates a new #ClutterBinLayout layout manager
*
* Return value: the newly created layout manager
*
* Since: 1.2
*/
ClutterLayoutManager *
clutter_bin_layout_new (ClutterBinAlignment x_align,
ClutterBinAlignment y_align)
{
return g_object_new (CLUTTER_TYPE_BIN_LAYOUT,
"x-align", x_align,
"y-align", y_align,
NULL);
}
/**
* clutter_bin_layout_set_alignment:
* @self: a #ClutterBinLayout
* @child: (allow-none): a child of @container
* @x_align: the horizontal alignment policy to be used for the @child
* inside @container
* @y_align: the vertical aligment policy to be used on the @child
* inside @container
*
* Sets the horizontal and vertical alignment policies to be applied
* to a @child of @self
*
* If @child is %NULL then the @x_align and @y_align values will
* be set as the default alignment policies
*
* Since: 1.2
*/
void
clutter_bin_layout_set_alignment (ClutterBinLayout *self,
ClutterActor *child,
ClutterBinAlignment x_align,
ClutterBinAlignment y_align)
{
ClutterBinLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BIN_LAYOUT (self));
g_return_if_fail (child == NULL || CLUTTER_IS_ACTOR (child));
priv = self->priv;
if (priv->container == NULL)
{
if (child == NULL)
{
set_x_align (self, x_align);
set_y_align (self, y_align);
}
else
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before setting the alignment "
"on its children",
G_OBJECT_TYPE_NAME (self));
return;
}
manager = CLUTTER_LAYOUT_MANAGER (self);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
child);
g_assert (CLUTTER_IS_BIN_LAYER (meta));
set_layer_x_align (CLUTTER_BIN_LAYER (meta), x_align);
set_layer_y_align (CLUTTER_BIN_LAYER (meta), y_align);
}
/**
* clutter_bin_layout_get_alignment:
* @self: a #ClutterBinLayout
* @child: (allow-none): a child of @container
* @x_align: (out) (allow-none): return location for the horizontal
* alignment policy
* @y_align: (out) (allow-none): return location for the vertical
* alignment policy
*
* Retrieves the horizontal and vertical alignment policies for
* a child of @self
*
* If @child is %NULL the default alignment policies will be returned
* instead
*
* Since: 1.2
*/
void
clutter_bin_layout_get_alignment (ClutterBinLayout *self,
ClutterActor *child,
ClutterBinAlignment *x_align,
ClutterBinAlignment *y_align)
{
ClutterBinLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
ClutterBinLayer *layer;
g_return_if_fail (CLUTTER_IS_BIN_LAYOUT (self));
priv = self->priv;
if (priv->container == NULL)
{
if (child == NULL)
{
if (x_align)
*x_align = priv->x_align;
if (y_align)
*y_align = priv->y_align;
}
else
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before getting the alignment "
"of its children",
G_OBJECT_TYPE_NAME (self));
return;
}
manager = CLUTTER_LAYOUT_MANAGER (self);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
child);
g_assert (CLUTTER_IS_BIN_LAYER (meta));
layer = CLUTTER_BIN_LAYER (meta);
if (x_align)
*x_align = layer->x_align;
if (y_align)
*y_align = layer->y_align;
}
/**
* clutter_bin_layout_add:
* @self: a #ClutterBinLayout
* @child: a #ClutterActor
* @x_align: horizontal alignment policy for @child
* @y_align: vertical alignment policy for @child
*
* Adds a #ClutterActor to the container using @self and
* sets the alignment policies for it
*
* This function is equivalent to clutter_container_add_actor()
* and clutter_layout_manager_child_set_property() but it does not
* require a pointer to the #ClutterContainer associated to the
* #ClutterBinLayout
*
* Since: 1.2
*/
void
clutter_bin_layout_add (ClutterBinLayout *self,
ClutterActor *child,
ClutterBinAlignment x_align,
ClutterBinAlignment y_align)
{
ClutterBinLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BIN_LAYOUT (self));
g_return_if_fail (CLUTTER_IS_ACTOR (child));
priv = self->priv;
if (priv->container == NULL)
{
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before adding children",
G_OBJECT_TYPE_NAME (self));
return;
}
clutter_container_add_actor (priv->container, child);
manager = CLUTTER_LAYOUT_MANAGER (self);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
child);
g_assert (CLUTTER_IS_BIN_LAYER (meta));
set_layer_x_align (CLUTTER_BIN_LAYER (meta), x_align);
set_layer_y_align (CLUTTER_BIN_LAYER (meta), y_align);
}
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