mutter/clutter/clutter-bin-layout.c

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-actor.h"
#include "clutter-animatable.h"
#include "clutter-bin-layout.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-private.h"
#define CLUTTER_BIN_LAYOUT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_BIN_LAYOUT, ClutterBinLayoutPrivate))
struct _ClutterBinLayoutPrivate
{
ClutterBinAlignment x_align;
ClutterBinAlignment y_align;
gdouble x_factor;
gdouble y_factor;
};
enum
{
PROP_0,
PROP_X_ALIGN,
PROP_Y_ALIGN
};
G_DEFINE_TYPE (ClutterBinLayout,
clutter_bin_layout,
CLUTTER_TYPE_LAYOUT_MANAGER);
static void
set_x_align (ClutterBinLayout *self,
ClutterBinAlignment alignment)
{
ClutterBinLayoutPrivate *priv = self->priv;
if (priv->x_align != alignment)
{
priv->x_align = alignment;
g_object_notify (G_OBJECT (self), "x-align");
}
}
static void
set_y_align (ClutterBinLayout *self,
ClutterBinAlignment alignment)
{
ClutterBinLayoutPrivate *priv = self->priv;
if (priv->y_align != alignment)
{
priv->y_align = alignment;
g_object_notify (G_OBJECT (self), "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)
{
GList *children = clutter_container_get_children (container);
GList *l;
gfloat min_width, nat_width;
min_width = nat_width = 0.0;
for (l = children; l != NULL; l = l->next)
{
ClutterActor *child = l->data;
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)
{
GList *children = clutter_container_get_children (container);
GList *l;
gfloat min_height, nat_height;
min_height = nat_height = 0.0;
for (l = children; l != NULL; l = l->next)
{
ClutterActor *child = l->data;
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)
{
ClutterBinLayoutPrivate *priv = CLUTTER_BIN_LAYOUT (manager)->priv;
GList *children = clutter_container_get_children (container);
GList *l;
gfloat available_w, available_h;
available_w = clutter_actor_box_get_width (allocation);
available_h = clutter_actor_box_get_height (allocation);
for (l = children; l != NULL; l = l->next)
{
ClutterActor *child = l->data;
ClutterActorBox child_alloc = { 0, };
gfloat child_width, child_height;
ClutterRequestMode request;
if (priv->x_align == CLUTTER_BIN_ALIGNMENT_FILL)
{
child_alloc.x1 = (int) 0;
child_alloc.x2 = (int) available_w;
}
if (priv->y_align == CLUTTER_BIN_ALIGNMENT_FILL)
{
child_alloc.y1 = (int) 0;
child_alloc.y2 = (int) available_h;
}
/* if we are filling horizontally and vertically then we
* can break here because we already have a full allocation
*/
if (priv->x_align == CLUTTER_BIN_ALIGNMENT_FILL &&
priv->y_align == CLUTTER_BIN_ALIGNMENT_FILL)
{
clutter_actor_allocate (child, &child_alloc, flags);
break;
}
request = CLUTTER_REQUEST_HEIGHT_FOR_WIDTH;
g_object_get (G_OBJECT (child), "request-mode", &request, NULL);
if (request == CLUTTER_REQUEST_HEIGHT_FOR_WIDTH)
{
gfloat min_width, nat_width;
gfloat min_height, nat_height;
clutter_actor_get_preferred_width (child, available_h,
&min_width,
&nat_width);
child_width = CLAMP (nat_width, min_width, available_w);
clutter_actor_get_preferred_height (child, child_width,
&min_height,
&nat_height);
child_height = CLAMP (nat_height, min_height, available_h);
}
else if (request == CLUTTER_REQUEST_WIDTH_FOR_HEIGHT)
{
gfloat min_width, nat_width;
gfloat min_height, nat_height;
clutter_actor_get_preferred_height (child, available_w,
&min_height,
&nat_height);
child_height = CLAMP (nat_height, min_height, available_h);
clutter_actor_get_preferred_width (child, child_height,
&min_width,
&nat_width);
child_width = CLAMP (nat_width, min_width, available_w);
}
if (priv->x_align == CLUTTER_BIN_ALIGNMENT_FIXED)
{
child_alloc.x1 = (int) clutter_actor_get_x (child);
child_alloc.x2 = (int) child_alloc.x1 + child_width;
}
else
{
gdouble x_align = get_bin_alignment_factor (priv->x_align);
if (priv->x_align != CLUTTER_BIN_ALIGNMENT_FILL)
{
child_alloc.x1 = (int) ((available_w - child_width) * x_align);
child_alloc.x2 = (int) child_alloc.x1 + child_width;
}
}
if (priv->y_align == CLUTTER_BIN_ALIGNMENT_FIXED)
{
child_alloc.y1 = (int) clutter_actor_get_y (child);
child_alloc.y2 = (int) child_alloc.y1 + child_height;
}
else
{
gdouble y_align = get_bin_alignment_factor (priv->y_align);
if (priv->y_align != CLUTTER_BIN_ALIGNMENT_FILL)
{
child_alloc.y1 = (int) ((available_h - child_height) * y_align);
child_alloc.y2 = (int) child_alloc.y1 + child_height;
}
}
clutter_actor_allocate (child, &child_alloc, flags);
}
g_list_free (children);
}
static void
clutter_bin_layout_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case PROP_X_ALIGN:
set_x_align (CLUTTER_BIN_LAYOUT (gobject),
g_value_get_enum (value));
break;
case PROP_Y_ALIGN:
set_y_align (CLUTTER_BIN_LAYOUT (gobject),
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);
GParamSpec *pspec;
g_type_class_add_private (klass, sizeof (ClutterBinLayoutPrivate));
gobject_class->set_property = clutter_bin_layout_set_property;
gobject_class->get_property = clutter_bin_layout_get_property;
pspec = g_param_spec_enum ("x-align",
"X Align",
"Horizontal alignment for the actors "
"inside the layout manager",
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_X_ALIGN, pspec);
pspec = g_param_spec_enum ("y-align",
"Y Align",
"Vertical alignment for the actors "
"inside the layout manager",
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_Y_ALIGN, pspec);
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;
}
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;
}
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);
}
void
clutter_bin_layout_set_alignment (ClutterBinLayout *self,
ClutterBinAlignment x_align,
ClutterBinAlignment y_align)
{
g_return_if_fail (CLUTTER_IS_BIN_LAYOUT (self));
set_x_align (self, x_align);
set_y_align (self, y_align);
}
void
clutter_bin_layout_get_alignment (ClutterBinLayout *self,
ClutterBinAlignment *x_align,
ClutterBinAlignment *y_align)
{
g_return_if_fail (CLUTTER_IS_BIN_LAYOUT (self));
if (x_align)
*x_align = self->priv->x_align;
if (y_align)
*y_align = self->priv->y_align;
}