[gnome-shell] Import MxBoxLayout, MxBoxLayoutChild



commit 8b6962f3bf3532acf7b0749af4d821606eb906ab
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Thu Sep 10 01:42:25 2009 -0400

    Import MxBoxLayout, MxBoxLayoutChild
    
    https://bugzilla.gnome.org/show_bug.cgi?id=591245

 src/Makefile-st.am           |    4 +
 src/st/st-box-layout-child.c |  189 ++++++++
 src/st/st-box-layout-child.h |   84 ++++
 src/st/st-box-layout.c       | 1038 ++++++++++++++++++++++++++++++++++++++++++
 src/st/st-box-layout.h       |   97 ++++
 5 files changed, 1412 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile-st.am b/src/Makefile-st.am
index c069c71..d0f4877 100644
--- a/src/Makefile-st.am
+++ b/src/Makefile-st.am
@@ -67,6 +67,8 @@ st-enum-types.c: stamp-st-enum-types.h st/st-enum-types.c.in
 st_source_h =					\
     st/st-adjustment.h				\
     st/st-bin.h					\
+    st/st-box-layout.h				\
+    st/st-box-layout-child.h			\
     st/st-button.h				\
     st/st-private.h				\
     st/st-stylable.h				\
@@ -86,6 +88,8 @@ st_source_h =					\
 st_source_c =					\
     st/st-adjustment.c				\
     st/st-bin.c					\
+    st/st-box-layout.c				\
+    st/st-box-layout-child.c			\
     st/st-button.c				\
     st/st-private.c				\
     st/st-scrollable.c				\
diff --git a/src/st/st-box-layout-child.c b/src/st/st-box-layout-child.c
new file mode 100644
index 0000000..f1d9953
--- /dev/null
+++ b/src/st/st-box-layout-child.c
@@ -0,0 +1,189 @@
+/*
+ * st-box-layout-child.c: box layout child actor
+ *
+ * Copyright 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Written by: Thomas Wood <thomas wood intel com>
+ */
+
+/**
+ * SECTION:st-box-layout-child
+ * @short_description: meta data associated with a #StBoxLayout child.
+ *
+ * #StBoxLayoutChild is a #ClutterChildMeta implementation that stores the
+ * child properties for children inside a #StBoxLayout.
+ */
+
+#include "st-box-layout-child.h"
+#include "st-private.h"
+
+G_DEFINE_TYPE (StBoxLayoutChild, st_box_layout_child, CLUTTER_TYPE_CHILD_META)
+
+#define BOX_LAYOUT_CHILD_PRIVATE(o) \
+  (G_TYPE_INSTANCE_GET_PRIVATE ((o), ST_TYPE_BOX_LAYOUT_CHILD, StBoxLayoutChildPrivate))
+
+
+enum
+{
+  PROP_0,
+
+  PROP_EXPAND,
+  PROP_X_FILL,
+  PROP_Y_FILL,
+  PROP_X_ALIGN,
+  PROP_Y_ALIGN
+};
+
+static void
+st_box_layout_child_get_property (GObject    *object,
+                                  guint       property_id,
+                                  GValue     *value,
+                                  GParamSpec *pspec)
+{
+  StBoxLayoutChild *child = ST_BOX_LAYOUT_CHILD (object);
+
+  switch (property_id)
+    {
+    case PROP_EXPAND:
+      g_value_set_boolean (value, child->expand);
+      break;
+    case PROP_X_FILL:
+      g_value_set_boolean (value, child->x_fill);
+      break;
+    case PROP_Y_FILL:
+      g_value_set_boolean (value, child->y_fill);
+      break;
+    case PROP_X_ALIGN:
+      g_value_set_enum (value, child->x_align);
+      break;
+    case PROP_Y_ALIGN:
+      g_value_set_enum (value, child->y_align);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+st_box_layout_child_set_property (GObject      *object,
+                                  guint         property_id,
+                                  const GValue *value,
+                                  GParamSpec   *pspec)
+{
+  StBoxLayoutChild *child = ST_BOX_LAYOUT_CHILD (object);
+  StBoxLayout *box = ST_BOX_LAYOUT (CLUTTER_CHILD_META (object)->container);
+
+  switch (property_id)
+    {
+    case PROP_EXPAND:
+      child->expand = g_value_get_boolean (value);
+      break;
+    case PROP_X_FILL:
+      child->x_fill = g_value_get_boolean (value);
+      break;
+    case PROP_Y_FILL:
+      child->y_fill = g_value_get_boolean (value);
+      break;
+    case PROP_X_ALIGN:
+      child->x_align = g_value_get_enum (value);
+      break;
+    case PROP_Y_ALIGN:
+      child->y_align = g_value_get_enum (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+
+  clutter_actor_queue_relayout ((ClutterActor*) box);
+}
+
+static void
+st_box_layout_child_dispose (GObject *object)
+{
+  G_OBJECT_CLASS (st_box_layout_child_parent_class)->dispose (object);
+}
+
+static void
+st_box_layout_child_finalize (GObject *object)
+{
+  G_OBJECT_CLASS (st_box_layout_child_parent_class)->finalize (object);
+}
+
+static void
+st_box_layout_child_class_init (StBoxLayoutChildClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GParamSpec *pspec;
+
+  object_class->get_property = st_box_layout_child_get_property;
+  object_class->set_property = st_box_layout_child_set_property;
+  object_class->dispose = st_box_layout_child_dispose;
+  object_class->finalize = st_box_layout_child_finalize;
+
+
+  pspec = g_param_spec_boolean ("expand", "Expand",
+                                "Allocate the child extra space",
+                                FALSE,
+                                ST_PARAM_READWRITE);
+  g_object_class_install_property (object_class, PROP_EXPAND, pspec);
+
+  pspec = g_param_spec_boolean ("x-fill", "x-fill",
+                                "Whether the child should receive priority "
+                                "when the container is allocating spare space "
+                                "on the horizontal axis",
+                                TRUE,
+                                ST_PARAM_READWRITE);
+  g_object_class_install_property (object_class, PROP_X_FILL, pspec);
+
+  pspec = g_param_spec_boolean ("y-fill", "y-fill",
+                                "Whether the child should receive priority "
+                                "when the container is allocating spare space "
+                                "on the vertical axis",
+                                TRUE,
+                                ST_PARAM_READWRITE);
+  g_object_class_install_property (object_class, PROP_Y_FILL, pspec);
+
+  pspec = g_param_spec_enum ("x-align",
+                             "X Alignment",
+                             "X alignment of the widget within the cell",
+                             ST_TYPE_ALIGN,
+                             ST_ALIGN_MIDDLE,
+                             ST_PARAM_READWRITE);
+  g_object_class_install_property (object_class, PROP_X_ALIGN, pspec);
+
+  pspec = g_param_spec_enum ("y-align",
+                             "Y Alignment",
+                             "Y alignment of the widget within the cell",
+                             ST_TYPE_ALIGN,
+                             ST_ALIGN_MIDDLE,
+                             ST_PARAM_READWRITE);
+  g_object_class_install_property (object_class, PROP_Y_ALIGN, pspec);
+}
+
+static void
+st_box_layout_child_init (StBoxLayoutChild *self)
+{
+  self->expand = FALSE;
+
+  self->x_fill = TRUE;
+  self->y_fill = TRUE;
+
+  self->x_align = ST_ALIGN_MIDDLE;
+  self->y_align = ST_ALIGN_MIDDLE;
+}
+
diff --git a/src/st/st-box-layout-child.h b/src/st/st-box-layout-child.h
new file mode 100644
index 0000000..ec1d199
--- /dev/null
+++ b/src/st/st-box-layout-child.h
@@ -0,0 +1,84 @@
+/*
+ * st-box-layout-child.h: box layout child actor
+ *
+ * Copyright 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Written by: Thomas Wood <thomas wood intel com>
+ */
+
+#ifndef _ST_BOX_LAYOUT_CHILD_H
+#define _ST_BOX_LAYOUT_CHILD_H
+
+#include <clutter/clutter.h>
+#include "st-enum-types.h"
+#include "st-box-layout.h"
+
+G_BEGIN_DECLS
+
+#define ST_TYPE_BOX_LAYOUT_CHILD st_box_layout_child_get_type()
+
+#define ST_BOX_LAYOUT_CHILD(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+  ST_TYPE_BOX_LAYOUT_CHILD, StBoxLayoutChild))
+
+#define ST_BOX_LAYOUT_CHILD_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+  ST_TYPE_BOX_LAYOUT_CHILD, StBoxLayoutChildClass))
+
+#define ST_IS_BOX_LAYOUT_CHILD(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+  ST_TYPE_BOX_LAYOUT_CHILD))
+
+#define ST_IS_BOX_LAYOUT_CHILD_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+  ST_TYPE_BOX_LAYOUT_CHILD))
+
+#define ST_BOX_LAYOUT_CHILD_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+  ST_TYPE_BOX_LAYOUT_CHILD, StBoxLayoutChildClass))
+
+typedef struct _StBoxLayoutChild StBoxLayoutChild;
+typedef struct _StBoxLayoutChildClass StBoxLayoutChildClass;
+typedef struct _StBoxLayoutChildPrivate StBoxLayoutChildPrivate;
+
+/**
+ * StBoxLayoutChild:
+ *
+ * The contents of this structure are private and should only be accessed
+ * through the public API.
+ */
+struct _StBoxLayoutChild
+{
+  /*< private >*/
+  ClutterChildMeta parent;
+
+  gboolean expand;
+  gboolean x_fill : 1;
+  gboolean y_fill : 1;
+  StAlign x_align;
+  StAlign y_align;
+};
+
+struct _StBoxLayoutChildClass
+{
+  ClutterChildMetaClass parent_class;
+};
+
+GType st_box_layout_child_get_type (void);
+
+G_END_DECLS
+
+#endif /* _ST_BOX_LAYOUT_CHILD_H */
diff --git a/src/st/st-box-layout.c b/src/st/st-box-layout.c
new file mode 100644
index 0000000..f6fb76f
--- /dev/null
+++ b/src/st/st-box-layout.c
@@ -0,0 +1,1038 @@
+/*
+ * st-box-layout.h: box layout actor
+ *
+ * Copyright 2009 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Written by: Thomas Wood <thomas wood intel com>
+ *
+ */
+
+/**
+ * SECTION:st-box-layout
+ * @short_description: a layout container arranging children in a single line
+ *
+ * The #StBoxLayout arranges its children along a single line, where each
+ * child can be allocated either its preferred size or larger if the expand
+ * option is set. If the fill option is set, the actor will be allocated more
+ * than its requested size. If the fill option is not set, but the expand option
+ * is enabled, then the position of the actor within the available space can
+ * be determined by the alignment child property.
+ *
+ */
+
+#include "st-box-layout.h"
+
+#include "st-private.h"
+#include "st-scrollable.h"
+#include "st-box-layout-child.h"
+
+
+
+static void st_box_container_iface_init (ClutterContainerIface *iface);
+static void st_box_scrollable_interface_init (StScrollableInterface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (StBoxLayout, st_box_layout, ST_TYPE_WIDGET,
+                         G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_CONTAINER,
+                                                st_box_container_iface_init)
+                         G_IMPLEMENT_INTERFACE (ST_TYPE_SCROLLABLE,
+                                                st_box_scrollable_interface_init));
+
+#define BOX_LAYOUT_PRIVATE(o) \
+  (G_TYPE_INSTANCE_GET_PRIVATE ((o), ST_TYPE_BOX_LAYOUT, StBoxLayoutPrivate))
+
+enum {
+  PROP_0,
+
+  PROP_VERTICAL,
+  PROP_PACK_START,
+  PROP_SPACING,
+
+  PROP_HADJUST,
+  PROP_VADJUST
+};
+
+struct _StBoxLayoutPrivate
+{
+  GList        *children;
+
+  guint         spacing;
+
+  guint         is_vertical : 1;
+  guint         is_pack_start : 1;
+
+  StAdjustment *hadjustment;
+  StAdjustment *vadjustment;
+};
+
+/*
+ * StScrollable Interface Implementation
+ */
+static void
+adjustment_value_notify_cb (StAdjustment *adjustment,
+                            GParamSpec   *pspec,
+                            StBoxLayout  *box)
+{
+  clutter_actor_queue_redraw (CLUTTER_ACTOR (box));
+}
+
+static void
+scrollable_set_adjustments (StScrollable *scrollable,
+                            StAdjustment *hadjustment,
+                            StAdjustment *vadjustment)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (scrollable)->priv;
+
+  if (hadjustment != priv->hadjustment)
+    {
+      if (priv->hadjustment)
+        {
+          g_signal_handlers_disconnect_by_func (priv->hadjustment,
+                                                adjustment_value_notify_cb,
+                                                scrollable);
+          g_object_unref (priv->hadjustment);
+        }
+
+      if (hadjustment)
+        {
+          g_object_ref (hadjustment);
+          g_signal_connect (hadjustment, "notify::value",
+                            G_CALLBACK (adjustment_value_notify_cb),
+                            scrollable);
+        }
+
+      priv->hadjustment = hadjustment;
+    }
+
+  if (vadjustment != priv->vadjustment)
+    {
+      if (priv->vadjustment)
+        {
+          g_signal_handlers_disconnect_by_func (priv->vadjustment,
+                                                adjustment_value_notify_cb,
+                                                scrollable);
+          g_object_unref (priv->vadjustment);
+        }
+
+      if (vadjustment)
+        {
+          g_object_ref (vadjustment);
+          g_signal_connect (vadjustment, "notify::value",
+                            G_CALLBACK (adjustment_value_notify_cb),
+                            scrollable);
+        }
+
+      priv->vadjustment = vadjustment;
+    }
+}
+
+static void
+scrollable_get_adjustments (StScrollable  *scrollable,
+                            StAdjustment **hadjustment,
+                            StAdjustment **vadjustment)
+{
+  StBoxLayoutPrivate *priv;
+  ClutterActor *actor, *stage;
+
+  priv = (ST_BOX_LAYOUT (scrollable))->priv;
+
+  actor = CLUTTER_ACTOR (scrollable);
+  stage = clutter_actor_get_stage (actor);
+  if (G_UNLIKELY (stage == NULL))
+    stage = clutter_stage_get_default ();
+
+  if (hadjustment)
+    {
+      if (priv->hadjustment)
+        *hadjustment = priv->hadjustment;
+      else
+        {
+          StAdjustment *adjustment;
+          gdouble width, stage_width, increment;
+
+          width = clutter_actor_get_width (actor);
+          stage_width = clutter_actor_get_width (stage);
+          increment = MAX (1.0, MIN (stage_width, width));
+
+          adjustment = st_adjustment_new (0,
+                                          0,
+                                          width,
+                                          1.0,
+                                          increment,
+                                          increment);
+
+          scrollable_set_adjustments (scrollable,
+                                      adjustment,
+                                      priv->vadjustment);
+
+          *hadjustment = adjustment;
+        }
+    }
+
+  if (vadjustment)
+    {
+      if (priv->vadjustment)
+        *vadjustment = priv->vadjustment;
+      else
+        {
+          StAdjustment *adjustment;
+          gdouble height, stage_height, increment;
+
+          height = clutter_actor_get_height (actor);
+          stage_height = clutter_actor_get_height (stage);
+          increment = MAX (1.0, MIN (stage_height, height));
+
+          adjustment = st_adjustment_new (0,
+                                          0,
+                                          height,
+                                          1.0,
+                                          increment,
+                                          increment);
+
+          scrollable_set_adjustments (scrollable,
+                                      priv->hadjustment,
+                                      adjustment);
+
+          *vadjustment = adjustment;
+        }
+    }
+}
+
+
+
+static void
+st_box_scrollable_interface_init (StScrollableInterface *iface)
+{
+  iface->set_adjustments = scrollable_set_adjustments;
+  iface->get_adjustments = scrollable_get_adjustments;
+}
+
+/*
+ * ClutterContainer Implementation
+ */
+static void
+st_box_container_add_actor (ClutterContainer *container,
+                            ClutterActor     *actor)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (container)->priv;
+
+  clutter_actor_set_parent (actor, CLUTTER_ACTOR (container));
+
+  priv->children = g_list_append (priv->children, actor);
+
+  g_signal_emit_by_name (container, "actor-added", actor);
+}
+
+static void
+st_box_container_remove_actor (ClutterContainer *container,
+                               ClutterActor     *actor)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (container)->priv;
+
+  GList *item = NULL;
+
+  item = g_list_find (priv->children, actor);
+
+  if (item == NULL)
+    {
+      g_warning ("Actor of type '%s' is not a child of container of type '%s'",
+                 g_type_name (G_OBJECT_TYPE (actor)),
+                 g_type_name (G_OBJECT_TYPE (container)));
+      return;
+    }
+
+  g_object_ref (actor);
+
+  priv->children = g_list_delete_link (priv->children, item);
+  clutter_actor_unparent (actor);
+
+  g_signal_emit_by_name (container, "actor-removed", actor);
+
+  g_object_unref (actor);
+
+  clutter_actor_queue_relayout ((ClutterActor*) container);
+}
+
+static void
+st_box_container_foreach (ClutterContainer *container,
+                          ClutterCallback   callback,
+                          gpointer          callback_data)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (container)->priv;
+
+  g_list_foreach (priv->children, (GFunc) callback, callback_data);
+}
+
+static void
+st_box_container_lower (ClutterContainer *container,
+                        ClutterActor     *actor,
+                        ClutterActor     *sibling)
+{
+  /* XXX: not yet implemented */
+  g_warning ("%s() not yet implemented", __FUNCTION__);
+}
+
+static void
+st_box_container_raise (ClutterContainer *container,
+                        ClutterActor     *actor,
+                        ClutterActor     *sibling)
+{
+  /* XXX: not yet implemented */
+  g_warning ("%s() not yet implemented", __FUNCTION__);
+}
+
+static void
+st_box_container_sort_depth_order (ClutterContainer *container)
+{
+  /* XXX: not yet implemented */
+  g_warning ("%s() not yet implemented", __FUNCTION__);
+}
+
+static void
+st_box_container_iface_init (ClutterContainerIface *iface)
+{
+  iface->add = st_box_container_add_actor;
+  iface->remove = st_box_container_remove_actor;
+  iface->foreach = st_box_container_foreach;
+  iface->lower = st_box_container_lower;
+  iface->raise = st_box_container_raise;
+  iface->sort_depth_order = st_box_container_sort_depth_order;
+
+  iface->child_meta_type = ST_TYPE_BOX_LAYOUT_CHILD;
+}
+
+
+static void
+st_box_layout_get_property (GObject    *object,
+                            guint       property_id,
+                            GValue     *value,
+                            GParamSpec *pspec)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (object)->priv;
+  StAdjustment *adjustment;
+
+  switch (property_id)
+    {
+    case PROP_VERTICAL:
+      g_value_set_boolean (value, priv->is_vertical);
+      break;
+
+    case PROP_PACK_START:
+      g_value_set_boolean (value, priv->is_pack_start);
+      break;
+
+    case PROP_SPACING:
+      g_value_set_uint (value, priv->spacing);
+      break;
+
+    case PROP_HADJUST:
+      scrollable_get_adjustments (ST_SCROLLABLE (object), &adjustment, NULL);
+      g_value_set_object (value, adjustment);
+      break;
+
+    case PROP_VADJUST:
+      scrollable_get_adjustments (ST_SCROLLABLE (object), NULL, &adjustment);
+      g_value_set_object (value, adjustment);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+st_box_layout_set_property (GObject      *object,
+                            guint         property_id,
+                            const GValue *value,
+                            GParamSpec   *pspec)
+{
+  StBoxLayout *box = ST_BOX_LAYOUT (object);
+
+  switch (property_id)
+    {
+    case PROP_VERTICAL:
+      st_box_layout_set_vertical (box, g_value_get_boolean (value));
+      break;
+
+    case PROP_PACK_START:
+      st_box_layout_set_pack_start (box, g_value_get_boolean (value));
+      break;
+
+    case PROP_SPACING:
+      st_box_layout_set_spacing (box, g_value_get_uint (value));
+      break;
+
+    case PROP_HADJUST:
+      scrollable_set_adjustments (ST_SCROLLABLE (object),
+                                  g_value_get_object (value),
+                                  box->priv->vadjustment);
+      break;
+
+    case PROP_VADJUST:
+      scrollable_set_adjustments (ST_SCROLLABLE (object),
+                                  box->priv->hadjustment,
+                                  g_value_get_object (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+st_box_layout_dispose (GObject *object)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (object)->priv;
+
+  while (priv->children)
+    {
+      clutter_actor_unparent (CLUTTER_ACTOR (priv->children->data));
+
+      priv->children = g_list_delete_link (priv->children, priv->children);
+    }
+
+  if (priv->hadjustment)
+    {
+      g_object_unref (priv->hadjustment);
+      priv->hadjustment = NULL;
+    }
+
+  if (priv->vadjustment)
+    {
+      g_object_unref (priv->vadjustment);
+      priv->vadjustment = NULL;
+    }
+
+  G_OBJECT_CLASS (st_box_layout_parent_class)->dispose (object);
+}
+
+static void
+st_box_layout_get_preferred_width (ClutterActor *actor,
+                                   gfloat        for_height,
+                                   gfloat       *min_width_p,
+                                   gfloat       *natural_width_p)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (actor)->priv;
+  StPadding padding = { 0, };
+  gint n_children = 0;
+  GList *l;
+
+  st_widget_get_padding (ST_WIDGET (actor), &padding);
+
+  if (min_width_p)
+    *min_width_p = padding.left + padding.right;
+
+  if (natural_width_p)
+    *natural_width_p = padding.left + padding.right;
+
+  if (priv->children == NULL)
+    return;
+
+  for (l = priv->children; l; l = g_list_next (l))
+    {
+      gfloat child_min = 0, child_nat = 0;
+
+      if (!CLUTTER_ACTOR_IS_VISIBLE ((ClutterActor*) l->data))
+        continue;
+
+      n_children++;
+
+      clutter_actor_get_preferred_width ((ClutterActor*) l->data,
+                                         (!priv->is_vertical) ? for_height : -1,
+                                         &child_min,
+                                         &child_nat);
+
+      if (priv->is_vertical)
+        {
+          if (min_width_p)
+            *min_width_p = MAX (child_min, *min_width_p);
+
+          if (natural_width_p)
+            *natural_width_p = MAX (child_nat, *natural_width_p);
+        }
+      else
+        {
+          if (min_width_p)
+            *min_width_p += child_min;
+
+          if (natural_width_p)
+            *natural_width_p += child_nat;
+
+        }
+    }
+
+
+  if (!priv->is_vertical && n_children > 1)
+    {
+      if (min_width_p)
+        *min_width_p += priv->spacing * (n_children - 1);
+
+      if (natural_width_p)
+        *natural_width_p += priv->spacing * (n_children - 1);
+    }
+}
+
+static void
+st_box_layout_get_preferred_height (ClutterActor *actor,
+                                    gfloat        for_width,
+                                    gfloat       *min_height_p,
+                                    gfloat       *natural_height_p)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (actor)->priv;
+  StPadding padding = { 0, };
+  gint n_children = 0;
+  GList *l;
+
+  st_widget_get_padding (ST_WIDGET (actor), &padding);
+
+  if (min_height_p)
+    *min_height_p = padding.top + padding.bottom;
+
+  if (natural_height_p)
+    *natural_height_p = padding.top + padding.bottom;
+
+  if (priv->children == NULL)
+    return;
+
+  for (l = priv->children; l; l = g_list_next (l))
+    {
+      gfloat child_min = 0, child_nat = 0;
+
+      if (!CLUTTER_ACTOR_IS_VISIBLE ((ClutterActor*) l->data))
+        continue;
+
+      n_children++;
+
+      clutter_actor_get_preferred_height ((ClutterActor*) l->data,
+                                          (priv->is_vertical) ? for_width : -1,
+                                          &child_min,
+                                          &child_nat);
+
+      if (!priv->is_vertical)
+        {
+          if (min_height_p)
+            *min_height_p = MAX (child_min, *min_height_p);
+
+          if (natural_height_p)
+            *natural_height_p = MAX (child_nat, *natural_height_p);
+        }
+      else
+        {
+          if (min_height_p)
+            *min_height_p += child_min;
+
+          if (natural_height_p)
+            *natural_height_p += child_nat;
+        }
+    }
+
+  if (priv->is_vertical && n_children > 1)
+    {
+      if (min_height_p)
+        *min_height_p += priv->spacing * (n_children - 1);
+
+      if (natural_height_p)
+        *natural_height_p += priv->spacing * (n_children - 1);
+    }
+}
+
+static void
+st_box_layout_allocate (ClutterActor          *actor,
+                        const ClutterActorBox *box,
+                        ClutterAllocationFlags flags)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (actor)->priv;
+  gfloat avail_width, avail_height, pref_width, pref_height;
+  StPadding padding = { 0, };
+  gfloat position = 0;
+  GList *l;
+  gint n_expand_children, extra_space;
+
+  CLUTTER_ACTOR_CLASS (st_box_layout_parent_class)->allocate (actor, box,
+                                                              flags);
+
+  if (priv->children == NULL)
+    return;
+
+  st_widget_get_padding (ST_WIDGET (actor), &padding);
+  avail_width  = box->x2 - box->x1
+                 - padding.left
+                 - padding.right;
+  avail_height = box->y2 - box->y1
+                 - padding.top
+                 - padding.bottom;
+
+  st_box_layout_get_preferred_height (actor, avail_width, NULL,
+                                      &pref_height);
+  st_box_layout_get_preferred_width (actor, avail_height, NULL,
+                                     &pref_width);
+
+  /* update adjustments for scrolling */
+  if (priv->vadjustment)
+    {
+      gdouble prev_value;
+
+      g_object_set (G_OBJECT (priv->vadjustment),
+                    "lower", 0.0,
+                    "upper", pref_height,
+                    "page-size", avail_height,
+                    "step-increment", avail_height / 6,
+                    "page-increment", avail_height,
+                    NULL);
+
+      prev_value = st_adjustment_get_value (priv->vadjustment);
+      st_adjustment_set_value (priv->vadjustment, prev_value);
+    }
+
+  if (priv->hadjustment)
+    {
+      gdouble prev_value;
+
+      g_object_set (G_OBJECT (priv->hadjustment),
+                    "lower", 0.0,
+                    "upper", pref_width,
+                    "page-size", avail_width,
+                    "step-increment", avail_width / 6,
+                    "page-increment", avail_width,
+                    NULL);
+
+      prev_value = st_adjustment_get_value (priv->hadjustment);
+      st_adjustment_set_value (priv->hadjustment, prev_value);
+    }
+
+  /* count the number of children with expand set to TRUE */
+  n_expand_children = 0;
+  for (l = priv->children; l; l = l->next)
+    {
+      gboolean expand;
+      clutter_container_child_get ((ClutterContainer *) actor,
+                                   (ClutterActor*) l->data,
+                                   "expand", &expand,
+                                   NULL);
+      if (expand)
+        n_expand_children++;
+    }
+
+  if (n_expand_children == 0)
+    {
+      extra_space = 0;
+      n_expand_children = 1;
+    }
+  else
+    {
+      if (priv->is_vertical)
+        extra_space = (avail_height - pref_height) / n_expand_children;
+      else
+        extra_space = (avail_width - pref_width) / n_expand_children;
+
+      /* don't shrink anything */
+      if (extra_space < 0)
+        extra_space = 0;
+    }
+
+  if (priv->is_vertical)
+    position = padding.top;
+  else
+    position = padding.left;
+
+  if (priv->is_pack_start)
+    l = g_list_last (priv->children);
+  else
+    l = priv->children;
+
+  for (l = (priv->is_pack_start) ? g_list_last (priv->children) : priv->children;
+       l;
+       l = (priv->is_pack_start) ? l->prev : l->next)
+    {
+      ClutterActor *child = (ClutterActor*) l->data;
+      ClutterActorBox child_box;
+      gfloat child_nat;
+      gboolean xfill, yfill, expand;
+      StAlign xalign, yalign;
+
+      if (!CLUTTER_ACTOR_IS_VISIBLE (child))
+        continue;
+
+      clutter_container_child_get ((ClutterContainer*) actor, child,
+                                   "x-fill", &xfill,
+                                   "y-fill", &yfill,
+                                   "x-align", &xalign,
+                                   "y-align", &yalign,
+                                   "expand", &expand,
+                                   NULL);
+
+      if (priv->is_vertical)
+        {
+          clutter_actor_get_preferred_height (child, avail_width,
+                                              NULL, &child_nat);
+
+          child_box.y1 = position;
+          if (expand)
+            child_box.y2 = position + child_nat + extra_space;
+          else
+            child_box.y2 = position + child_nat;
+          child_box.x1 = padding.left;
+          child_box.x2 = avail_width;
+
+          _st_allocate_fill (child, &child_box, xalign, yalign, xfill, yfill);
+          clutter_actor_allocate (child, &child_box, flags);
+
+          if (expand)
+            position += (child_nat + priv->spacing + extra_space);
+          else
+            position += (child_nat + priv->spacing);
+        }
+      else
+        {
+
+          clutter_actor_get_preferred_width (child, avail_height,
+                                             NULL, &child_nat);
+
+          child_box.x1 = position;
+
+          if (expand)
+            child_box.x2 = position + child_nat + extra_space;
+          else
+            child_box.x2 = position + child_nat;
+
+          child_box.y1 = padding.top;
+          child_box.y2 = avail_height;
+          _st_allocate_fill (child, &child_box, xalign, yalign, xfill, yfill);
+          clutter_actor_allocate (child, &child_box, flags);
+
+          if (expand)
+            position += (child_nat + priv->spacing + extra_space);
+          else
+            position += (child_nat + priv->spacing);
+        }
+    }
+}
+
+static void
+st_box_layout_apply_transform (ClutterActor *a,
+                               CoglMatrix   *m)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (a)->priv;
+  gdouble x, y;
+
+  CLUTTER_ACTOR_CLASS (st_box_layout_parent_class)->apply_transform (a, m);
+
+  if (priv->hadjustment)
+    x = st_adjustment_get_value (priv->hadjustment);
+  else
+    x = 0;
+
+  if (priv->vadjustment)
+    y = st_adjustment_get_value (priv->vadjustment);
+  else
+    y = 0;
+
+  cogl_matrix_translate (m, (int) -x, (int) -y, 0);
+}
+
+
+static void
+st_box_layout_paint (ClutterActor *actor)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (actor)->priv;
+  GList *l;
+  gdouble x, y;
+  ClutterActorBox child_b;
+  ClutterActorBox box_b;
+
+  CLUTTER_ACTOR_CLASS (st_box_layout_parent_class)->paint (actor);
+
+  if (priv->children == NULL)
+    return;
+
+  if (priv->hadjustment)
+    x = st_adjustment_get_value (priv->hadjustment);
+  else
+    x = 0;
+
+  if (priv->vadjustment)
+    y = st_adjustment_get_value (priv->vadjustment);
+  else
+    y = 0;
+
+  clutter_actor_get_allocation_box (actor, &box_b);
+  box_b.x2 = (box_b.x2 - box_b.x1) + x;
+  box_b.x1 = x;
+  box_b.y2 = (box_b.y2 - box_b.y1) + y;
+  box_b.y1 = y;
+
+  for (l = priv->children; l; l = g_list_next (l))
+    {
+      ClutterActor *child = (ClutterActor*) l->data;
+
+      if (!CLUTTER_ACTOR_IS_VISIBLE (child))
+        continue;
+
+      clutter_actor_get_allocation_box (child, &child_b);
+
+      if ((child_b.x1 < box_b.x2) &&
+          (child_b.x2 > box_b.x1) &&
+          (child_b.y1 < box_b.y2) &&
+          (child_b.y2 > box_b.y1))
+        {
+          clutter_actor_paint (child);
+        }
+    }
+}
+
+static void
+st_box_layout_pick (ClutterActor       *actor,
+                    const ClutterColor *color)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (actor)->priv;
+  GList *l;
+  gdouble x, y;
+  ClutterActorBox child_b;
+  ClutterActorBox box_b;
+
+  CLUTTER_ACTOR_CLASS (st_box_layout_parent_class)->pick (actor, color);
+
+  if (priv->children == NULL)
+    return;
+
+  if (priv->hadjustment)
+    x = st_adjustment_get_value (priv->hadjustment);
+  else
+    x = 0;
+
+  if (priv->vadjustment)
+    y = st_adjustment_get_value (priv->vadjustment);
+  else
+    y = 0;
+
+  clutter_actor_get_allocation_box (actor, &box_b);
+  box_b.x2 = (box_b.x2 - box_b.x1) + x;
+  box_b.x1 = x;
+  box_b.y2 = (box_b.y2 - box_b.y1) + y;
+  box_b.y1 = y;
+
+  for (l = priv->children; l; l = g_list_next (l))
+    {
+      ClutterActor *child = (ClutterActor*) l->data;
+
+      if (!CLUTTER_ACTOR_IS_VISIBLE (child))
+        continue;
+
+      clutter_actor_get_allocation_box (child, &child_b);
+
+      if ((child_b.x1 < box_b.x2)
+          && (child_b.x2 > box_b.x1)
+          && (child_b.y1 < box_b.y2)
+          && (child_b.y2 > box_b.y1))
+        {
+          clutter_actor_paint (child);
+        }
+    }
+}
+
+static void
+st_box_layout_class_init (StBoxLayoutClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
+  GParamSpec *pspec;
+
+  g_type_class_add_private (klass, sizeof (StBoxLayoutPrivate));
+
+  object_class->get_property = st_box_layout_get_property;
+  object_class->set_property = st_box_layout_set_property;
+  object_class->dispose = st_box_layout_dispose;
+
+  actor_class->allocate = st_box_layout_allocate;
+  actor_class->get_preferred_width = st_box_layout_get_preferred_width;
+  actor_class->get_preferred_height = st_box_layout_get_preferred_height;
+  actor_class->apply_transform = st_box_layout_apply_transform;
+
+  actor_class->paint = st_box_layout_paint;
+  actor_class->pick = st_box_layout_pick;
+
+  pspec = g_param_spec_boolean ("vertical",
+                                "Vertical",
+                                "Whether the layout should be vertical, rather"
+                                "than horizontal",
+                                FALSE,
+                                ST_PARAM_READWRITE);
+  g_object_class_install_property (object_class, PROP_VERTICAL, pspec);
+
+  pspec = g_param_spec_boolean ("pack-start",
+                                "Pack Start",
+                                "Whether to pack items at the start of the box",
+                                FALSE,
+                                ST_PARAM_READWRITE);
+  g_object_class_install_property (object_class, PROP_PACK_START, pspec);
+
+  pspec = g_param_spec_uint ("spacing",
+                             "Spacing",
+                             "Spacing between children",
+                             0, G_MAXUINT, 0,
+                             ST_PARAM_READWRITE);
+  g_object_class_install_property (object_class, PROP_SPACING, pspec);
+
+  /* StScrollable properties */
+  g_object_class_override_property (object_class,
+                                    PROP_HADJUST,
+                                    "hadjustment");
+
+  g_object_class_override_property (object_class,
+                                    PROP_VADJUST,
+                                    "vadjustment");
+
+}
+
+static void
+st_box_layout_init (StBoxLayout *self)
+{
+  self->priv = BOX_LAYOUT_PRIVATE (self);
+}
+
+/**
+ * st_box_layout_new:
+ *
+ * Create a new #StBoxLayout.
+ *
+ * Returns: a newly allocated #StBoxLayout
+ */
+StWidget *
+st_box_layout_new (void)
+{
+  return g_object_new (ST_TYPE_BOX_LAYOUT, NULL);
+}
+
+/**
+ * st_box_layout_set_vertical:
+ * @box: A #StBoxLayout
+ * @vertical: #TRUE if the layout should be vertical
+ *
+ * Set the value of the #StBoxLayout::vertical property
+ *
+ */
+void
+st_box_layout_set_vertical (StBoxLayout *box,
+                            gboolean     vertical)
+{
+  g_return_if_fail (ST_IS_BOX_LAYOUT (box));
+
+  if (box->priv->is_vertical != vertical)
+    {
+      box->priv->is_vertical = vertical;
+      clutter_actor_queue_relayout ((ClutterActor*) box);
+
+      g_object_notify (G_OBJECT (box), "vertical");
+    }
+}
+
+/**
+ * st_box_layout_get_vertical:
+ * @box: A #StBoxLayout
+ *
+ * Get the value of the #StBoxLayout::vertical property.
+ *
+ * Returns: #TRUE if the layout is vertical
+ */
+gboolean
+st_box_layout_get_vertical (StBoxLayout *box)
+{
+  g_return_val_if_fail (ST_IS_BOX_LAYOUT (box), FALSE);
+
+  return box->priv->is_vertical;
+}
+
+/**
+ * st_box_layout_set_pack_start:
+ * @box: A #StBoxLayout
+ * @pack_start: #TRUE if the layout should use pack-start
+ *
+ * Set the value of the #StBoxLayout::pack-start property.
+ *
+ */
+void
+st_box_layout_set_pack_start (StBoxLayout *box,
+                              gboolean     pack_start)
+{
+  g_return_if_fail (ST_IS_BOX_LAYOUT (box));
+
+  if (box->priv->is_pack_start != pack_start)
+    {
+      box->priv->is_pack_start = pack_start;
+      clutter_actor_queue_relayout ((ClutterActor*) box);
+
+      g_object_notify (G_OBJECT (box), "pack-start");
+    }
+}
+
+/**
+ * st_box_layout_get_pack_start:
+ * @box: A #StBoxLayout
+ *
+ * Get the value of the #StBoxLayout::pack-start property.
+ *
+ * Returns: #TRUE if pack-start is enabled
+ */
+gboolean
+st_box_layout_get_pack_start (StBoxLayout *box)
+{
+  g_return_val_if_fail (ST_IS_BOX_LAYOUT (box), FALSE);
+
+  return box->priv->is_pack_start;
+}
+
+/**
+ * st_box_layout_set_spacing:
+ * @box: A #StBoxLayout
+ * @spacing: the spacing value
+ *
+ * Set the amount of spacing between children in pixels
+ *
+ */
+void
+st_box_layout_set_spacing (StBoxLayout *box,
+                           guint        spacing)
+{
+  StBoxLayoutPrivate *priv;
+
+  g_return_if_fail (ST_IS_BOX_LAYOUT (box));
+
+  priv = box->priv;
+
+  if (priv->spacing != spacing)
+    {
+      priv->spacing = spacing;
+
+      clutter_actor_queue_relayout (CLUTTER_ACTOR (box));
+
+      g_object_notify (G_OBJECT (box), "spacing");
+    }
+}
+
+/**
+ * st_box_layout_get_spacing:
+ * @box: A #StBoxLayout
+ *
+ * Get the spacing between children in pixels
+ *
+ * Returns: the spacing value
+ */
+guint
+st_box_layout_get_spacing (StBoxLayout *box)
+{
+  g_return_val_if_fail (ST_IS_BOX_LAYOUT (box), 0);
+
+  return box->priv->spacing;
+}
diff --git a/src/st/st-box-layout.h b/src/st/st-box-layout.h
new file mode 100644
index 0000000..7a12174
--- /dev/null
+++ b/src/st/st-box-layout.h
@@ -0,0 +1,97 @@
+/*
+ * st-box-layout.h: box layout actor
+ *
+ * Copyright 2009 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Written by: Thomas Wood <thomas wood intel com>
+ *
+ */
+
+#if !defined(ST_H_INSIDE) && !defined(ST_COMPILATION)
+#error "Only <st/st.h> can be included directly.h"
+#endif
+
+#ifndef _ST_BOX_LAYOUT_H
+#define _ST_BOX_LAYOUT_H
+
+#include <st/st-widget.h>
+
+G_BEGIN_DECLS
+
+#define ST_TYPE_BOX_LAYOUT st_box_layout_get_type()
+
+#define ST_BOX_LAYOUT(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+  ST_TYPE_BOX_LAYOUT, StBoxLayout))
+
+#define ST_BOX_LAYOUT_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+  ST_TYPE_BOX_LAYOUT, StBoxLayoutClass))
+
+#define ST_IS_BOX_LAYOUT(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+  ST_TYPE_BOX_LAYOUT))
+
+#define ST_IS_BOX_LAYOUT_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+  ST_TYPE_BOX_LAYOUT))
+
+#define ST_BOX_LAYOUT_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+  ST_TYPE_BOX_LAYOUT, StBoxLayoutClass))
+
+typedef struct _StBoxLayout StBoxLayout;
+typedef struct _StBoxLayoutClass StBoxLayoutClass;
+typedef struct _StBoxLayoutPrivate StBoxLayoutPrivate;
+
+/**
+ * StBoxLayout:
+ *
+ * The contents of this structure are private and should only be accessed
+ * through the public API.
+ */
+struct _StBoxLayout
+{
+  /*< private >*/
+  StWidget parent;
+
+  StBoxLayoutPrivate *priv;
+};
+
+struct _StBoxLayoutClass
+{
+  StWidgetClass parent_class;
+};
+
+GType st_box_layout_get_type (void);
+
+StWidget *st_box_layout_new (void);
+
+void     st_box_layout_set_vertical   (StBoxLayout *box,
+                                       gboolean     vertical);
+gboolean st_box_layout_get_vertical   (StBoxLayout *box);
+
+void     st_box_layout_set_pack_start (StBoxLayout *box,
+                                       gboolean     pack_start);
+gboolean st_box_layout_get_pack_start (StBoxLayout *box);
+
+void     st_box_layout_set_spacing    (StBoxLayout *box,
+                                       guint        spacing);
+guint    st_box_layout_get_spacing    (StBoxLayout *box);
+
+G_END_DECLS
+
+#endif /* _ST_BOX_LAYOUT_H */



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