/*
* 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 .
*
* Author:
* Emmanuele Bassi
*
* Based on the NBTK NbtkBoxLayout actor by:
* Thomas Wood
*/
/**
* SECTION:clutter-box-layout
* @short_description: A layout manager arranging children on a single line
*
* The #ClutterBoxLayout is a #ClutterLayoutManager implementing the
* following layout policy:
*
* - all children are arranged on a single line
* - the axis used is controlled by the #ClutterBoxLayout:orientation property
* - the order of the packing is determined by the #ClutterBoxLayout:pack-start boolean property
* - each child will be allocated to its natural size or, if #ClutterActor:x-expand or
* #ClutterActor:y-expand are set, the available size
* - honours the #ClutterActor's #ClutterActor:x-align and #ClutterActor:y-align properties
* to fill the available size
* - if the #ClutterBoxLayout:homogeneous boolean propert is set, then all widgets will
* get the same size, ignoring expand settings and the preferred sizes
*
* It is possible to control the spacing between children of a
* #ClutterBoxLayout by using clutter_box_layout_set_spacing().
*
* #ClutterBoxLayout is available since Clutter 1.2
*/
#include "clutter-build-config.h"
#include
#define CLUTTER_DISABLE_DEPRECATION_WARNINGS
#include "deprecated/clutter-container.h"
#include "clutter-box-layout.h"
#include "clutter-actor-private.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-layout-meta.h"
#include "clutter-private.h"
#include "clutter-types.h"
#define CLUTTER_TYPE_BOX_CHILD (clutter_box_child_get_type ())
#define CLUTTER_BOX_CHILD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_BOX_CHILD, ClutterBoxChild))
#define CLUTTER_IS_BOX_CHILD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_BOX_CHILD))
typedef struct _ClutterBoxChild ClutterBoxChild;
typedef struct _ClutterLayoutMetaClass ClutterBoxChildClass;
struct _ClutterBoxLayoutPrivate
{
ClutterContainer *container;
guint spacing;
ClutterAnimationMode easing_mode;
guint easing_duration;
ClutterOrientation orientation;
guint is_pack_start : 1;
guint is_homogeneous : 1;
};
struct _ClutterBoxChild
{
ClutterLayoutMeta parent_instance;
ClutterBoxAlignment x_align;
ClutterBoxAlignment y_align;
guint x_fill : 1;
guint y_fill : 1;
guint expand : 1;
};
enum
{
PROP_CHILD_0,
PROP_CHILD_X_ALIGN,
PROP_CHILD_Y_ALIGN,
PROP_CHILD_X_FILL,
PROP_CHILD_Y_FILL,
PROP_CHILD_EXPAND,
PROP_CHILD_LAST
};
enum
{
PROP_0,
PROP_SPACING,
PROP_HOMOGENEOUS,
PROP_PACK_START,
PROP_ORIENTATION,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST] = { NULL, };
GType clutter_box_child_get_type (void);
G_DEFINE_TYPE (ClutterBoxChild,
clutter_box_child,
CLUTTER_TYPE_LAYOUT_META)
G_DEFINE_TYPE_WITH_PRIVATE (ClutterBoxLayout,
clutter_box_layout,
CLUTTER_TYPE_LAYOUT_MANAGER)
typedef struct _RequestedSize
{
ClutterActor *actor;
gfloat minimum_size;
gfloat natural_size;
} RequestedSize;
static float distribute_natural_allocation (float extra_space,
unsigned int n_requested_sizes,
RequestedSize *sizes);
static void count_expand_children (ClutterLayoutManager *layout,
ClutterContainer *container,
gint *visible_children,
gint *expand_children);
/*
* ClutterBoxChild
*/
static void
box_child_set_align (ClutterBoxChild *self,
ClutterBoxAlignment x_align,
ClutterBoxAlignment y_align)
{
gboolean x_changed = FALSE, y_changed = FALSE;
if (self->x_align != x_align)
{
self->x_align = x_align;
x_changed = TRUE;
}
if (self->y_align != y_align)
{
self->y_align = y_align;
y_changed = TRUE;
}
if (x_changed || y_changed)
{
ClutterLayoutManager *layout;
layout = clutter_layout_meta_get_manager (CLUTTER_LAYOUT_META (self));
clutter_layout_manager_layout_changed (layout);
if (x_changed)
g_object_notify (G_OBJECT (self), "x-align");
if (y_changed)
g_object_notify (G_OBJECT (self), "y-align");
}
}
static void
box_child_set_fill (ClutterBoxChild *self,
gboolean x_fill,
gboolean y_fill)
{
gboolean x_changed = FALSE, y_changed = FALSE;
if (self->x_fill != x_fill)
{
self->x_fill = x_fill;
x_changed = TRUE;
}
if (self->y_fill != y_fill)
{
self->y_fill = y_fill;
y_changed = TRUE;
}
if (x_changed || y_changed)
{
ClutterLayoutManager *layout;
layout = clutter_layout_meta_get_manager (CLUTTER_LAYOUT_META (self));
clutter_layout_manager_layout_changed (layout);
if (x_changed)
g_object_notify (G_OBJECT (self), "x-fill");
if (y_changed)
g_object_notify (G_OBJECT (self), "y-fill");
}
}
static void
box_child_set_expand (ClutterBoxChild *self,
gboolean expand)
{
if (self->expand != expand)
{
ClutterLayoutManager *layout;
self->expand = expand;
layout = clutter_layout_meta_get_manager (CLUTTER_LAYOUT_META (self));
clutter_layout_manager_layout_changed (layout);
g_object_notify (G_OBJECT (self), "expand");
}
}
static void
clutter_box_child_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBoxChild *self = CLUTTER_BOX_CHILD (gobject);
switch (prop_id)
{
case PROP_CHILD_X_ALIGN:
box_child_set_align (self,
g_value_get_enum (value),
self->y_align);
break;
case PROP_CHILD_Y_ALIGN:
box_child_set_align (self,
self->x_align,
g_value_get_enum (value));
break;
case PROP_CHILD_X_FILL:
box_child_set_fill (self,
g_value_get_boolean (value),
self->y_fill);
break;
case PROP_CHILD_Y_FILL:
box_child_set_fill (self,
self->x_fill,
g_value_get_boolean (value));
break;
case PROP_CHILD_EXPAND:
box_child_set_expand (self, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_child_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBoxChild *self = CLUTTER_BOX_CHILD (gobject);
switch (prop_id)
{
case PROP_CHILD_X_ALIGN:
g_value_set_enum (value, self->x_align);
break;
case PROP_CHILD_Y_ALIGN:
g_value_set_enum (value, self->y_align);
break;
case PROP_CHILD_X_FILL:
g_value_set_boolean (value, self->x_fill);
break;
case PROP_CHILD_Y_FILL:
g_value_set_boolean (value, self->y_fill);
break;
case PROP_CHILD_EXPAND:
g_value_set_boolean (value, self->expand);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_child_class_init (ClutterBoxChildClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GParamSpec *pspec;
gobject_class->set_property = clutter_box_child_set_property;
gobject_class->get_property = clutter_box_child_get_property;
pspec = g_param_spec_boolean ("expand",
P_("Expand"),
P_("Allocate extra space for the child"),
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_EXPAND, pspec);
pspec = g_param_spec_boolean ("x-fill",
P_("Horizontal Fill"),
P_("Whether the child should receive priority "
"when the container is allocating spare space "
"on the horizontal axis"),
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_X_FILL, pspec);
pspec = g_param_spec_boolean ("y-fill",
P_("Vertical Fill"),
P_("Whether the child should receive priority "
"when the container is allocating spare space "
"on the vertical axis"),
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_Y_FILL, pspec);
pspec = g_param_spec_enum ("x-align",
P_("Horizontal Alignment"),
P_("Horizontal alignment of the actor within "
"the cell"),
CLUTTER_TYPE_BOX_ALIGNMENT,
CLUTTER_BOX_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_X_ALIGN, pspec);
pspec = g_param_spec_enum ("y-align",
P_("Vertical Alignment"),
P_("Vertical alignment of the actor within "
"the cell"),
CLUTTER_TYPE_BOX_ALIGNMENT,
CLUTTER_BOX_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_Y_ALIGN, pspec);
}
static void
clutter_box_child_init (ClutterBoxChild *self)
{
self->x_align = CLUTTER_BOX_ALIGNMENT_CENTER;
self->y_align = CLUTTER_BOX_ALIGNMENT_CENTER;
self->x_fill = self->y_fill = FALSE;
self->expand = FALSE;
}
static gdouble
get_box_alignment_factor (ClutterBoxAlignment alignment)
{
switch (alignment)
{
case CLUTTER_BOX_ALIGNMENT_CENTER:
return 0.5;
case CLUTTER_BOX_ALIGNMENT_START:
return 0.0;
case CLUTTER_BOX_ALIGNMENT_END:
return 1.0;
}
return 0.0;
}
static GType
clutter_box_layout_get_child_meta_type (ClutterLayoutManager *manager)
{
return CLUTTER_TYPE_BOX_CHILD;
}
static void
clutter_box_layout_set_container (ClutterLayoutManager *layout,
ClutterContainer *container)
{
ClutterBoxLayoutPrivate *priv = CLUTTER_BOX_LAYOUT (layout)->priv;
ClutterLayoutManagerClass *parent_class;
priv->container = container;
if (priv->container != NULL)
{
ClutterRequestMode request_mode;
/* we need to change the :request-mode of the container
* to match the orientation
*/
request_mode = priv->orientation == CLUTTER_ORIENTATION_VERTICAL
? CLUTTER_REQUEST_HEIGHT_FOR_WIDTH
: CLUTTER_REQUEST_WIDTH_FOR_HEIGHT;
clutter_actor_set_request_mode (CLUTTER_ACTOR (priv->container),
request_mode);
}
parent_class = CLUTTER_LAYOUT_MANAGER_CLASS (clutter_box_layout_parent_class);
parent_class->set_container (layout, container);
}
static void
get_child_size (ClutterActor *actor,
ClutterOrientation orientation,
gfloat for_size,
gfloat *min_size_p,
gfloat *natural_size_p)
{
if (orientation == CLUTTER_ORIENTATION_HORIZONTAL)
clutter_actor_get_preferred_width (actor, for_size, min_size_p, natural_size_p);
else
clutter_actor_get_preferred_height (actor, for_size, min_size_p, natural_size_p);
}
/* Handle the request in the orientation of the box (i.e. width request of horizontal box) */
static void
get_preferred_size_for_orientation (ClutterBoxLayout *self,
ClutterActor *container,
gfloat for_size,
gfloat *min_size_p,
gfloat *natural_size_p)
{
ClutterBoxLayoutPrivate *priv = self->priv;
ClutterActorIter iter;
ClutterActor *child;
gint n_children = 0;
gfloat minimum, natural;
minimum = natural = 0;
clutter_actor_iter_init (&iter, container);
while (clutter_actor_iter_next (&iter, &child))
{
gfloat child_min = 0, child_nat = 0;
if (!clutter_actor_is_visible (child))
continue;
n_children++;
get_child_size (child, priv->orientation,
for_size, &child_min, &child_nat);
minimum += child_min;
natural += child_nat;
}
if (n_children > 1)
{
minimum += priv->spacing * (n_children - 1);
natural += priv->spacing * (n_children - 1);
}
if (min_size_p)
*min_size_p = minimum;
if (natural_size_p)
*natural_size_p = natural;
}
static void
get_base_size_for_opposite_orientation (ClutterBoxLayout *self,
ClutterActor *container,
gfloat *min_size_p,
gfloat *natural_size_p)
{
ClutterBoxLayoutPrivate *priv = self->priv;
ClutterActorIter iter;
ClutterActor *child;
gint n_children = 0;
gfloat minimum, natural;
ClutterOrientation opposite_orientation =
priv->orientation == CLUTTER_ORIENTATION_HORIZONTAL
? CLUTTER_ORIENTATION_VERTICAL
: CLUTTER_ORIENTATION_HORIZONTAL;
minimum = natural = 0;
clutter_actor_iter_init (&iter, container);
while (clutter_actor_iter_next (&iter, &child))
{
gfloat child_min = 0, child_nat = 0;
if (!clutter_actor_is_visible (child))
continue;
n_children++;
get_child_size (child, opposite_orientation, -1, &child_min, &child_nat);
minimum = MAX (minimum, child_min);
natural = MAX (natural, child_nat);
}
if (min_size_p)
*min_size_p = minimum;
if (natural_size_p)
*natural_size_p = natural;
}
/* Handle the request in the opposite orientation of the box
* (i.e. height request of horizontal box)
*
* This operation requires a virtual allocation in the natural
* orientation of the box, after that each element must be asked
* for the size-for-virtually-allocated-size and the maximums of
* each child sample will be reported as the overall
* "size-for-size-in-opposite-orientation"
*/
static void
get_preferred_size_for_opposite_orientation (ClutterBoxLayout *self,
ClutterActor *container,
gfloat for_size,
gfloat *min_size_p,
gfloat *natural_size_p)
{
ClutterLayoutManager *layout = CLUTTER_LAYOUT_MANAGER (self);
ClutterBoxLayoutPrivate *priv = self->priv;
ClutterContainer *real_container = CLUTTER_CONTAINER (container);
ClutterActor *child;
ClutterActorIter iter;
gint nvis_children = 0, n_extra_widgets = 0;
gint nexpand_children = 0, i;
RequestedSize *sizes;
gfloat minimum, natural, size, extra = 0;
ClutterOrientation opposite_orientation =
priv->orientation == CLUTTER_ORIENTATION_HORIZONTAL
? CLUTTER_ORIENTATION_VERTICAL
: CLUTTER_ORIENTATION_HORIZONTAL;
minimum = natural = 0;
count_expand_children (layout, real_container,
&nvis_children, &nexpand_children);
if (nvis_children < 1)
{
if (min_size_p)
*min_size_p = 0;
if (natural_size_p)
*natural_size_p = 0;
return;
}
/* First collect the requested sizes in the natural orientation of the box */
sizes = g_newa (RequestedSize, nvis_children);
size = for_size;
i = 0;
clutter_actor_iter_init (&iter, container);
while (clutter_actor_iter_next (&iter, &child))
{
if (!clutter_actor_is_visible (child))
continue;
get_child_size (child, priv->orientation, -1,
&sizes[i].minimum_size,
&sizes[i].natural_size);
size -= sizes[i].minimum_size;
i++;
}
if (priv->is_homogeneous)
{
size = for_size - (nvis_children - 1) * priv->spacing;
extra = size / nvis_children;
n_extra_widgets = ((gint)size) % nvis_children;
}
else
{
/* Bring children up to size first */
if (isnormal (size) || size == 0)
{
size = distribute_natural_allocation (MAX (0, size),
nvis_children,
sizes);
}
else
{
g_critical ("Actor %s (%p) received the invalid "
"value %f as minimum/natural size\n",
G_OBJECT_TYPE_NAME (container), container, size);
size = 0;
}
/* Calculate space which hasn't distributed yet,
* and is available for expanding children.
*/
if (nexpand_children > 0)
{
extra = size / nexpand_children;
n_extra_widgets = ((gint)size) % nexpand_children;
}
}
/* Distribute expand space to children */
i = 0;
clutter_actor_iter_init (&iter, container);
while (clutter_actor_iter_next (&iter, &child))
{
ClutterLayoutMeta *meta;
ClutterBoxChild *box_child;
/* If widget is not visible, skip it. */
if (!clutter_actor_is_visible (child))
continue;
meta = clutter_layout_manager_get_child_meta (layout, real_container, child);
box_child = CLUTTER_BOX_CHILD (meta);
if (priv->is_homogeneous)
{
sizes[i].minimum_size = extra;
if (n_extra_widgets > 0)
{
sizes[i].minimum_size++;
n_extra_widgets--;
}
}
else
{
if (clutter_actor_needs_expand (child, priv->orientation) || box_child->expand)
{
sizes[i].minimum_size += extra;
if (n_extra_widgets > 0)
{
sizes[i].minimum_size++;
n_extra_widgets--;
}
}
}
i++;
}
/* Virtual allocation finished, now we can finally ask for the right size-for-size */
i = 0;
clutter_actor_iter_init (&iter, container);
while (clutter_actor_iter_next (&iter, &child))
{
gfloat child_min = 0, child_nat = 0;
if (!clutter_actor_is_visible (child))
continue;
get_child_size (child, opposite_orientation,
sizes[i].minimum_size,
&child_min, &child_nat);
minimum = MAX (minimum, child_min);
natural = MAX (natural, child_nat);
i++;
}
if (min_size_p)
*min_size_p = minimum;
if (natural_size_p)
*natural_size_p = natural;
}
static void
allocate_box_child (ClutterBoxLayout *self,
ClutterContainer *container,
ClutterActor *child,
ClutterActorBox *child_box)
{
ClutterBoxChild *box_child;
ClutterLayoutMeta *meta;
meta = clutter_layout_manager_get_child_meta (CLUTTER_LAYOUT_MANAGER (self),
container,
child);
box_child = CLUTTER_BOX_CHILD (meta);
CLUTTER_NOTE (LAYOUT, "Allocation for %s { %.2f, %.2f, %.2f, %.2f }",
_clutter_actor_get_debug_name (child),
child_box->x1, child_box->y1,
child_box->x2 - child_box->x1,
child_box->y2 - child_box->y1);
/* call allocate() instead of allocate_align_fill() if the actor needs
* expand in either direction. this will honour the actors alignment settings
*/
if (clutter_actor_needs_expand (child, CLUTTER_ORIENTATION_HORIZONTAL) ||
clutter_actor_needs_expand (child, CLUTTER_ORIENTATION_VERTICAL))
clutter_actor_allocate (child, child_box);
else
clutter_actor_allocate_align_fill (child, child_box,
get_box_alignment_factor (box_child->x_align),
get_box_alignment_factor (box_child->y_align),
box_child->x_fill,
box_child->y_fill);
}
static void
clutter_box_layout_get_preferred_width (ClutterLayoutManager *layout,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *natural_width_p)
{
ClutterBoxLayout *self = CLUTTER_BOX_LAYOUT (layout);
ClutterBoxLayoutPrivate *priv = self->priv;
if (priv->orientation == CLUTTER_ORIENTATION_VERTICAL)
{
if (for_height < 0)
get_base_size_for_opposite_orientation (self, CLUTTER_ACTOR (container),
min_width_p, natural_width_p);
else
get_preferred_size_for_opposite_orientation (self, CLUTTER_ACTOR (container), for_height,
min_width_p, natural_width_p);
}
else
get_preferred_size_for_orientation (self, CLUTTER_ACTOR (container), for_height,
min_width_p, natural_width_p);
}
static void
clutter_box_layout_get_preferred_height (ClutterLayoutManager *layout,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
ClutterBoxLayout *self = CLUTTER_BOX_LAYOUT (layout);
ClutterBoxLayoutPrivate *priv = self->priv;
if (priv->orientation == CLUTTER_ORIENTATION_HORIZONTAL)
{
if (for_width < 0)
get_base_size_for_opposite_orientation (self, CLUTTER_ACTOR (container),
min_height_p, natural_height_p);
else
get_preferred_size_for_opposite_orientation (self, CLUTTER_ACTOR (container), for_width,
min_height_p, natural_height_p);
}
else
get_preferred_size_for_orientation (self, CLUTTER_ACTOR (container), for_width,
min_height_p, natural_height_p);
}
static void
count_expand_children (ClutterLayoutManager *layout,
ClutterContainer *container,
gint *visible_children,
gint *expand_children)
{
ClutterBoxLayoutPrivate *priv = CLUTTER_BOX_LAYOUT (layout)->priv;
ClutterActor *actor, *child;
ClutterActorIter iter;
actor = CLUTTER_ACTOR (container);
*visible_children = *expand_children = 0;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
if (clutter_actor_is_visible (child))
{
ClutterLayoutMeta *meta;
*visible_children += 1;
meta = clutter_layout_manager_get_child_meta (layout,
container,
child);
if (clutter_actor_needs_expand (child, priv->orientation) ||
CLUTTER_BOX_CHILD (meta)->expand)
*expand_children += 1;
}
}
}
/* Pulled from gtksizerequest.c from Gtk+ */
static gint
compare_gap (gconstpointer p1,
gconstpointer p2,
gpointer data)
{
RequestedSize *sizes = data;
const guint *c1 = p1;
const guint *c2 = p2;
const gint d1 = MAX (sizes[*c1].natural_size -
sizes[*c1].minimum_size,
0);
const gint d2 = MAX (sizes[*c2].natural_size -
sizes[*c2].minimum_size,
0);
gint delta = (d2 - d1);
if (0 == delta)
delta = (*c2 - *c1);
return delta;
}
/*
* distribute_natural_allocation:
* @extra_space: Extra space to redistribute among children after subtracting
* minimum sizes and any child padding from the overall allocation
* @n_requested_sizes: Number of requests to fit into the allocation
* @sizes: An array of structs with a client pointer and a minimum/natural size
* in the orientation of the allocation.
*
* Distributes @extra_space to child @sizes by bringing smaller
* children up to natural size first.
*
* The remaining space will be added to the @minimum_size member of the
* RequestedSize struct. If all sizes reach their natural size then
* the remaining space is returned.
*
* Returns: The remainder of @extra_space after redistributing space
* to @sizes.
*
* Pulled from gtksizerequest.c from Gtk+
*/
static float
distribute_natural_allocation (float extra_space,
unsigned int n_requested_sizes,
RequestedSize *sizes)
{
unsigned int *spreading;
int i;
g_return_val_if_fail (isnormal (extra_space) || extra_space == 0, 0);
g_return_val_if_fail (extra_space >= 0, 0);
spreading = g_newa (unsigned int, n_requested_sizes);
for (i = 0; i < n_requested_sizes; i++)
spreading[i] = i;
/* Distribute the container's extra space c_gap. We want to assign
* this space such that the sum of extra space assigned to children
* (c^i_gap) is equal to c_cap. The case that there's not enough
* space for all children to take their natural size needs some
* attention. The goals we want to achieve are:
*
* a) Maximize number of children taking their natural size.
* b) The allocated size of children should be a continuous
* function of c_gap. That is, increasing the container size by
* one pixel should never make drastic changes in the distribution.
* c) If child i takes its natural size and child j doesn't,
* child j should have received at least as much gap as child i.
*
* The following code distributes the additional space by following
* these rules.
*/
/* Sort descending by gap and position. */
g_qsort_with_data (spreading,
n_requested_sizes, sizeof (unsigned int),
compare_gap, sizes);
/* Distribute available space.
* This master piece of a loop was conceived by Behdad Esfahbod.
*/
for (i = n_requested_sizes - 1; extra_space > 0 && i >= 0; --i)
{
/* Divide remaining space by number of remaining children.
* Sort order and reducing remaining space by assigned space
* ensures that space is distributed equally.
*/
int glue = (extra_space + i) / (i + 1);
int gap = sizes[(spreading[i])].natural_size
- sizes[(spreading[i])].minimum_size;
int extra = MIN (glue, gap);
sizes[spreading[i]].minimum_size += extra;
extra_space -= extra;
}
return extra_space;
}
/* Pulled from gtkbox.c from Gtk+ */
static void
clutter_box_layout_allocate (ClutterLayoutManager *layout,
ClutterContainer *container,
const ClutterActorBox *box)
{
ClutterBoxLayoutPrivate *priv = CLUTTER_BOX_LAYOUT (layout)->priv;
ClutterActor *actor, *child;
gint nvis_children;
gint nexpand_children;
gboolean is_rtl;
ClutterActorIter iter;
ClutterActorBox child_allocation;
RequestedSize *sizes;
gint size;
gint extra;
gint n_extra_widgets = 0; /* Number of widgets that receive 1 extra px */
gint x = 0, y = 0, i;
gfloat child_size;
count_expand_children (layout, container, &nvis_children, &nexpand_children);
CLUTTER_NOTE (LAYOUT, "BoxLayout for %s: visible=%d, expand=%d",
_clutter_actor_get_debug_name (CLUTTER_ACTOR (container)),
nvis_children,
nexpand_children);
/* If there is no visible child, simply return. */
if (nvis_children <= 0)
return;
sizes = g_newa (RequestedSize, nvis_children);
if (priv->orientation == CLUTTER_ORIENTATION_VERTICAL)
size = box->y2 - box->y1 - (nvis_children - 1) * priv->spacing;
else
size = box->x2 - box->x1 - (nvis_children - 1) * priv->spacing;
actor = CLUTTER_ACTOR (container);
/* Retrieve desired size for visible children. */
i = 0;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
if (!clutter_actor_is_visible (child))
continue;
if (priv->orientation == CLUTTER_ORIENTATION_VERTICAL)
clutter_actor_get_preferred_height (child,
box->x2 - box->x1,
&sizes[i].minimum_size,
&sizes[i].natural_size);
else
clutter_actor_get_preferred_width (child,
box->y2 - box->y1,
&sizes[i].minimum_size,
&sizes[i].natural_size);
/* Assert the api is working properly */
if (sizes[i].minimum_size < 0)
g_error ("ClutterBoxLayout child %s minimum %s: %f < 0 for %s %f",
_clutter_actor_get_debug_name (child),
priv->orientation == CLUTTER_ORIENTATION_VERTICAL
? "height"
: "width",
sizes[i].minimum_size,
priv->orientation == CLUTTER_ORIENTATION_VERTICAL
? "width"
: "height",
priv->orientation == CLUTTER_ORIENTATION_VERTICAL
? box->x2 - box->x1
: box->y2 - box->y1);
if (sizes[i].natural_size < sizes[i].minimum_size)
g_error ("ClutterBoxLayout child %s natural %s: %f < minimum %f for %s %f",
_clutter_actor_get_debug_name (child),
priv->orientation == CLUTTER_ORIENTATION_VERTICAL
? "height"
: "width",
sizes[i].natural_size,
sizes[i].minimum_size,
priv->orientation == CLUTTER_ORIENTATION_VERTICAL
? "width"
: "height",
priv->orientation == CLUTTER_ORIENTATION_VERTICAL
? box->x2 - box->x1
: box->y2 - box->y1);
size -= sizes[i].minimum_size;
sizes[i].actor = child;
i += 1;
}
if (priv->is_homogeneous)
{
/* If were homogenous we still need to run the above loop to get the
* minimum sizes for children that are not going to fill
*/
if (priv->orientation == CLUTTER_ORIENTATION_VERTICAL)
size = box->y2 - box->y1 - (nvis_children - 1) * priv->spacing;
else
size = box->x2 - box->x1 - (nvis_children - 1) * priv->spacing;
extra = size / nvis_children;
n_extra_widgets = size % nvis_children;
}
else
{
/* Bring children up to size first */
size = (gint) distribute_natural_allocation (MAX (0, (float) size),
nvis_children,
sizes);
/* Calculate space which hasn't distributed yet,
* and is available for expanding children.
*/
if (nexpand_children > 0)
{
extra = size / nexpand_children;
n_extra_widgets = size % nexpand_children;
}
else
extra = 0;
}
if (priv->orientation == CLUTTER_ORIENTATION_HORIZONTAL)
{
ClutterTextDirection text_dir;
text_dir = clutter_actor_get_text_direction (CLUTTER_ACTOR (container));
is_rtl = (text_dir == CLUTTER_TEXT_DIRECTION_RTL) ? TRUE : FALSE;
}
else
is_rtl = FALSE;
/* Allocate child positions. */
if (priv->orientation == CLUTTER_ORIENTATION_VERTICAL)
{
child_allocation.x1 = box->x1;
child_allocation.x2 = MAX (1.0, box->x2);
if (priv->is_pack_start)
y = box->y2 - box->y1;
else
y = box->y1;
}
else
{
child_allocation.y1 = box->y1;
child_allocation.y2 = MAX (1.0, box->y2);
if (priv->is_pack_start)
x = box->x2 - box->x1;
else
x = box->x1;
}
i = 0;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
ClutterLayoutMeta *meta;
ClutterBoxChild *box_child;
/* If widget is not visible, skip it. */
if (!clutter_actor_is_visible (child))
continue;
meta = clutter_layout_manager_get_child_meta (layout,
container,
child);
box_child = CLUTTER_BOX_CHILD (meta);
/* Assign the child's size. */
if (priv->is_homogeneous)
{
child_size = extra;
if (n_extra_widgets > 0)
{
child_size++;
n_extra_widgets--;
}
}
else
{
child_size = sizes[i].minimum_size;
if (clutter_actor_needs_expand (child, priv->orientation) ||
box_child->expand)
{
child_size += extra;
if (n_extra_widgets > 0)
{
child_size++;
n_extra_widgets--;
}
}
}
/* Assign the child's position. */
if (priv->orientation == CLUTTER_ORIENTATION_VERTICAL)
{
if (clutter_actor_needs_expand (child, priv->orientation) ||
box_child->expand)
{
child_allocation.y1 = y;
child_allocation.y2 = child_allocation.y1 + MAX (1.0, child_size);
}
else
{
child_allocation.y1 = y + (child_size - sizes[i].minimum_size) / 2;
child_allocation.y2 = child_allocation.y1 + sizes[i].minimum_size;
}
if (priv->is_pack_start)
{
y -= child_size + priv->spacing;
child_allocation.y1 -= child_size;
child_allocation.y2 -= child_size;
}
else
{
y += child_size + priv->spacing;
}
}
else /* CLUTTER_ORIENTATION_HORIZONTAL */
{
if (clutter_actor_needs_expand (child, priv->orientation) ||
box_child->expand)
{
child_allocation.x1 = x;
child_allocation.x2 = child_allocation.x1 + MAX (1.0, child_size);
}
else
{
child_allocation.x1 = x + (child_size - sizes[i].minimum_size) / 2;
child_allocation.x2 = child_allocation.x1 + sizes[i].minimum_size;
}
if (priv->is_pack_start)
{
x -= child_size + priv->spacing;
child_allocation.x1 -= child_size;
child_allocation.x2 -= child_size;
}
else
{
x += child_size + priv->spacing;
}
if (is_rtl)
{
gfloat width = child_allocation.x2 - child_allocation.x1;
child_allocation.x2 = box->x1 + (box->x2 - child_allocation.x1);
child_allocation.x1 = child_allocation.x2 - width;
}
}
allocate_box_child (CLUTTER_BOX_LAYOUT (layout),
container,
child,
&child_allocation);
i += 1;
}
}
static void
clutter_box_layout_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBoxLayout *self = CLUTTER_BOX_LAYOUT (gobject);
switch (prop_id)
{
case PROP_ORIENTATION:
clutter_box_layout_set_orientation (self, g_value_get_enum (value));
break;
case PROP_HOMOGENEOUS:
clutter_box_layout_set_homogeneous (self, g_value_get_boolean (value));
break;
case PROP_SPACING:
clutter_box_layout_set_spacing (self, g_value_get_uint (value));
break;
case PROP_PACK_START:
clutter_box_layout_set_pack_start (self, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_layout_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBoxLayoutPrivate *priv = CLUTTER_BOX_LAYOUT (gobject)->priv;
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, priv->orientation);
break;
case PROP_HOMOGENEOUS:
g_value_set_boolean (value, priv->is_homogeneous);
break;
case PROP_SPACING:
g_value_set_uint (value, priv->spacing);
break;
case PROP_PACK_START:
g_value_set_boolean (value, priv->is_pack_start);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_layout_class_init (ClutterBoxLayoutClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterLayoutManagerClass *layout_class;
layout_class = CLUTTER_LAYOUT_MANAGER_CLASS (klass);
layout_class->get_preferred_width = clutter_box_layout_get_preferred_width;
layout_class->get_preferred_height = clutter_box_layout_get_preferred_height;
layout_class->allocate = clutter_box_layout_allocate;
layout_class->set_container = clutter_box_layout_set_container;
layout_class->get_child_meta_type = clutter_box_layout_get_child_meta_type;
/**
* ClutterBoxLayout:orientation:
*
* The orientation of the #ClutterBoxLayout, either horizontal
* or vertical
*
* Since: 1.12
*/
obj_props[PROP_ORIENTATION] =
g_param_spec_enum ("orientation",
P_("Orientation"),
P_("The orientation of the layout"),
CLUTTER_TYPE_ORIENTATION,
CLUTTER_ORIENTATION_HORIZONTAL,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS);
/**
* ClutterBoxLayout:homogeneous:
*
* Whether the #ClutterBoxLayout should arrange its children
* homogeneously, i.e. all children get the same size
*
* Since: 1.4
*/
obj_props[PROP_HOMOGENEOUS] =
g_param_spec_boolean ("homogeneous",
P_("Homogeneous"),
P_("Whether the layout should be homogeneous, "
"i.e. all children get the same size"),
FALSE,
CLUTTER_PARAM_READWRITE);
/**
* ClutterBoxLayout:pack-start:
*
* Whether the #ClutterBoxLayout should pack items at the start
* or append them at the end
*
* Since: 1.2
*/
obj_props[PROP_PACK_START] =
g_param_spec_boolean ("pack-start",
P_("Pack Start"),
P_("Whether to pack items at the start of the box"),
FALSE,
CLUTTER_PARAM_READWRITE);
/**
* ClutterBoxLayout:spacing:
*
* The spacing between children of the #ClutterBoxLayout, in pixels
*
* Since: 1.2
*/
obj_props[PROP_SPACING] =
g_param_spec_uint ("spacing",
P_("Spacing"),
P_("Spacing between children"),
0, G_MAXUINT, 0,
CLUTTER_PARAM_READWRITE);
gobject_class->set_property = clutter_box_layout_set_property;
gobject_class->get_property = clutter_box_layout_get_property;
g_object_class_install_properties (gobject_class, PROP_LAST, obj_props);
}
static void
clutter_box_layout_init (ClutterBoxLayout *self)
{
self->priv = clutter_box_layout_get_instance_private (self);
self->priv->orientation = CLUTTER_ORIENTATION_HORIZONTAL;
self->priv->is_homogeneous = FALSE;
self->priv->is_pack_start = FALSE;
self->priv->spacing = 0;
self->priv->easing_mode = CLUTTER_EASE_OUT_CUBIC;
self->priv->easing_duration = 500;
}
/**
* clutter_box_layout_new:
*
* Creates a new #ClutterBoxLayout layout manager
*
* Return value: the newly created #ClutterBoxLayout
*
* Since: 1.2
*/
ClutterLayoutManager *
clutter_box_layout_new (void)
{
return g_object_new (CLUTTER_TYPE_BOX_LAYOUT, NULL);
}
/**
* clutter_box_layout_set_spacing:
* @layout: a #ClutterBoxLayout
* @spacing: the spacing between children of the layout, in pixels
*
* Sets the spacing between children of @layout
*
* Since: 1.2
*/
void
clutter_box_layout_set_spacing (ClutterBoxLayout *layout,
guint spacing)
{
ClutterBoxLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
priv = layout->priv;
if (priv->spacing != spacing)
{
ClutterLayoutManager *manager;
priv->spacing = spacing;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify (G_OBJECT (layout), "spacing");
}
}
/**
* clutter_box_layout_get_spacing:
* @layout: a #ClutterBoxLayout
*
* Retrieves the spacing set using clutter_box_layout_set_spacing()
*
* Return value: the spacing between children of the #ClutterBoxLayout
*
* Since: 1.2
*/
guint
clutter_box_layout_get_spacing (ClutterBoxLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_BOX_LAYOUT (layout), 0);
return layout->priv->spacing;
}
/**
* clutter_box_layout_set_orientation:
* @layout: a #ClutterBoxLayout
* @orientation: the orientation of the #ClutterBoxLayout
*
* Sets the orientation of the #ClutterBoxLayout layout manager.
*
* Since: 1.12
*/
void
clutter_box_layout_set_orientation (ClutterBoxLayout *layout,
ClutterOrientation orientation)
{
ClutterBoxLayoutPrivate *priv;
ClutterLayoutManager *manager;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
priv = layout->priv;
if (priv->orientation == orientation)
return;
priv->orientation = orientation;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (layout), obj_props[PROP_ORIENTATION]);
}
/**
* clutter_box_layout_get_orientation:
* @layout: a #ClutterBoxLayout
*
* Retrieves the orientation of the @layout.
*
* Return value: the orientation of the layout
*
* Since: 1.12
*/
ClutterOrientation
clutter_box_layout_get_orientation (ClutterBoxLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_BOX_LAYOUT (layout),
CLUTTER_ORIENTATION_HORIZONTAL);
return layout->priv->orientation;
}
/**
* clutter_box_layout_set_homogeneous:
* @layout: a #ClutterBoxLayout
* @homogeneous: %TRUE if the layout should be homogeneous
*
* Sets whether the size of @layout children should be
* homogeneous
*
* Since: 1.4
*/
void
clutter_box_layout_set_homogeneous (ClutterBoxLayout *layout,
gboolean homogeneous)
{
ClutterBoxLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
priv = layout->priv;
if (priv->is_homogeneous != homogeneous)
{
ClutterLayoutManager *manager;
priv->is_homogeneous = !!homogeneous;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify (G_OBJECT (layout), "homogeneous");
}
}
/**
* clutter_box_layout_get_homogeneous:
* @layout: a #ClutterBoxLayout
*
* Retrieves if the children sizes are allocated homogeneously.
*
* Return value: %TRUE if the #ClutterBoxLayout is arranging its children
* homogeneously, and %FALSE otherwise
*
* Since: 1.4
*/
gboolean
clutter_box_layout_get_homogeneous (ClutterBoxLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_BOX_LAYOUT (layout), FALSE);
return layout->priv->is_homogeneous;
}
/**
* clutter_box_layout_set_pack_start:
* @layout: a #ClutterBoxLayout
* @pack_start: %TRUE if the @layout should pack children at the
* beginning of the layout
*
* Sets whether children of @layout should be layed out by appending
* them or by prepending them
*
* Since: 1.2
*/
void
clutter_box_layout_set_pack_start (ClutterBoxLayout *layout,
gboolean pack_start)
{
ClutterBoxLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
priv = layout->priv;
if (priv->is_pack_start != pack_start)
{
ClutterLayoutManager *manager;
priv->is_pack_start = pack_start ? TRUE : FALSE;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify (G_OBJECT (layout), "pack-start");
}
}
/**
* clutter_box_layout_get_pack_start:
* @layout: a #ClutterBoxLayout
*
* Retrieves the value set using clutter_box_layout_set_pack_start()
*
* Return value: %TRUE if the #ClutterBoxLayout should pack children
* at the beginning of the layout, and %FALSE otherwise
*
* Since: 1.2
*/
gboolean
clutter_box_layout_get_pack_start (ClutterBoxLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_BOX_LAYOUT (layout), FALSE);
return layout->priv->is_pack_start;
}