[gnome-builder/wip/chergert/perspective] egg: rename GbSlider to EggSlider



commit 0d994829eb9bf1b429813c7de83e33de30fa69f5
Author: Christian Hergert <chergert redhat com>
Date:   Sun Nov 15 23:39:56 2015 -0800

    egg: rename GbSlider to EggSlider

 contrib/egg/Makefile.am  |    2 +
 contrib/egg/egg-slider.c |  929 ++++++++++++++++++++++++++++++++++++++++++++++
 contrib/egg/egg-slider.h |   56 +++
 3 files changed, 987 insertions(+), 0 deletions(-)
---
diff --git a/contrib/egg/Makefile.am b/contrib/egg/Makefile.am
index 12e8eae..19fad1a 100644
--- a/contrib/egg/Makefile.am
+++ b/contrib/egg/Makefile.am
@@ -34,6 +34,8 @@ libegg_private_la_SOURCES = \
        egg-settings-sandwich.h \
        egg-signal-group.c \
        egg-signal-group.h \
+       egg-slider.c \
+       egg-slider.h \
        egg-state-machine.c \
        egg-state-machine.h \
        egg-state-machine-action.c \
diff --git a/contrib/egg/egg-slider.c b/contrib/egg/egg-slider.c
new file mode 100644
index 0000000..b13a3cd
--- /dev/null
+++ b/contrib/egg/egg-slider.c
@@ -0,0 +1,929 @@
+/* egg-slider.c
+ *
+ * Copyright (C) 2015 Christian Hergert <christian hergert me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib/gi18n.h>
+
+#include "egg-animation.h"
+#include "egg-slider.h"
+
+#define clear_weak_pointer(ptr) \
+  (*(ptr) ? (g_object_remove_weak_pointer((GObject*)*(ptr), (gpointer*)ptr),*(ptr)=NULL,1) : 0)
+
+#define set_weak_pointer(ptr,obj) \
+  
((obj!=*(ptr))?(clear_weak_pointer(ptr),*(ptr)=obj,((obj)?g_object_add_weak_pointer((GObject*)obj,(gpointer*)ptr),NULL:NULL),1):0)
+
+typedef struct
+{
+  GtkWidget     *widget;
+  GdkWindow     *window;
+  GtkAllocation  allocation;
+  guint          position : 3;
+} EggSliderChild;
+
+typedef struct
+{
+  GtkAdjustment    *h_adj;
+  GtkAdjustment    *v_adj;
+
+  EggAnimation     *h_anim;
+  EggAnimation     *v_anim;
+
+  GPtrArray        *children;
+
+  EggSliderPosition  position;
+} EggSliderPrivate;
+
+static void buildable_iface_init (GtkBuildableIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (EggSlider, egg_slider, GTK_TYPE_CONTAINER,
+                         G_ADD_PRIVATE (EggSlider)
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, buildable_iface_init))
+
+enum {
+  PROP_0,
+  PROP_POSITION,
+  LAST_PROP
+};
+
+enum {
+  CHILD_PROP_0,
+  CHILD_PROP_POSITION,
+};
+
+#define ANIMATION_MODE     EGG_ANIMATION_EASE_IN_QUAD
+#define ANIMATION_DURATION 150
+
+static GParamSpec *properties [LAST_PROP];
+
+static void
+egg_slider_child_free (EggSliderChild *child)
+{
+  g_slice_free (EggSliderChild, child);
+}
+
+static void
+egg_slider_compute_margin (EggSlider *self,
+                          gint     *x_margin,
+                          gint     *y_margin)
+{
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  gdouble x_ratio;
+  gdouble y_ratio;
+  gsize i;
+  gint real_top_margin = 0;
+  gint real_bottom_margin = 0;
+  gint real_left_margin = 0;
+  gint real_right_margin = 0;
+
+  g_assert (EGG_IS_SLIDER (self));
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child;
+      gint margin;
+
+      child = g_ptr_array_index (priv->children, i);
+
+      switch (child->position)
+        {
+        case EGG_SLIDER_NONE:
+          break;
+
+        case EGG_SLIDER_BOTTOM:
+          gtk_widget_get_preferred_height (child->widget, NULL, &margin);
+          real_bottom_margin = MAX (real_bottom_margin, margin);
+          break;
+
+        case EGG_SLIDER_TOP:
+          gtk_widget_get_preferred_height (child->widget, NULL, &margin);
+          real_top_margin = MAX (real_top_margin, margin);
+          break;
+
+        case EGG_SLIDER_LEFT:
+          gtk_widget_get_preferred_width (child->widget, NULL, &margin);
+          real_left_margin = MAX (real_left_margin, margin);
+          break;
+
+        case EGG_SLIDER_RIGHT:
+          gtk_widget_get_preferred_width (child->widget, NULL, &margin);
+          real_right_margin = MAX (real_right_margin, margin);
+          break;
+
+        default:
+          g_assert_not_reached ();
+          break;
+        }
+    }
+
+  x_ratio = gtk_adjustment_get_value (priv->h_adj);
+  y_ratio = gtk_adjustment_get_value (priv->v_adj);
+
+  if (x_ratio < 0.0)
+    *x_margin = x_ratio * real_left_margin;
+  else if (x_ratio > 0.0)
+    *x_margin = x_ratio * real_right_margin;
+  else
+    *x_margin = 0.0;
+
+  if (y_ratio < 0.0)
+    *y_margin = y_ratio * real_bottom_margin;
+  else if (y_ratio > 0.0)
+    *y_margin = y_ratio * real_top_margin;
+  else
+    *y_margin = 0.0;
+}
+
+static void
+egg_slider_compute_child_allocation (EggSlider      *self,
+                                    EggSliderChild *child,
+                                    GtkAllocation *window_allocation,
+                                    GtkAllocation *child_allocation)
+{
+  GtkAllocation real_window_allocation;
+  GtkAllocation real_child_allocation;
+  gint nat_height;
+  gint nat_width;
+  gint x_margin;
+  gint y_margin;
+
+  g_assert (EGG_IS_SLIDER (self));
+  g_assert (child != NULL);
+  g_assert (GTK_IS_WIDGET (child->widget));
+
+  gtk_widget_get_allocation (GTK_WIDGET (self), &real_window_allocation);
+
+  egg_slider_compute_margin (self, &x_margin, &y_margin);
+
+  if (child->position == EGG_SLIDER_NONE)
+    {
+      real_child_allocation.y = y_margin;
+      real_child_allocation.x = 0;
+      real_child_allocation.width = real_window_allocation.width;
+      real_child_allocation.height = real_window_allocation.height;
+    }
+  else if (child->position == EGG_SLIDER_TOP)
+    {
+      gtk_widget_get_preferred_height (child->widget, NULL, &nat_height);
+
+      real_child_allocation.y = -nat_height;
+      real_child_allocation.x = 0;
+      real_child_allocation.height = nat_height;
+      real_child_allocation.width = real_window_allocation.width;
+    }
+  else if (child->position == EGG_SLIDER_BOTTOM)
+    {
+      gtk_widget_get_preferred_height (child->widget, NULL, &nat_height);
+
+      real_window_allocation.y += real_window_allocation.height + y_margin;
+      real_window_allocation.height = nat_height;
+
+      real_child_allocation.y = 0;
+      real_child_allocation.x = 0;
+      real_child_allocation.height = nat_height;
+      real_child_allocation.width = real_window_allocation.width;
+    }
+  else if (child->position == EGG_SLIDER_RIGHT)
+    {
+      gtk_widget_get_preferred_width (child->widget, NULL, &nat_width);
+
+      real_child_allocation.y = 0;
+      real_child_allocation.x = real_window_allocation.width;
+      real_child_allocation.height = real_window_allocation.height;
+      real_child_allocation.width = nat_width;
+    }
+  else if (child->position == EGG_SLIDER_LEFT)
+    {
+      gtk_widget_get_preferred_width (child->widget, NULL, &nat_width);
+
+      real_child_allocation.y = 0;
+      real_child_allocation.x = -nat_width;
+      real_child_allocation.height = real_window_allocation.height;
+      real_child_allocation.width = nat_width;
+    }
+
+  if (window_allocation)
+    *window_allocation = real_window_allocation;
+
+  if (child_allocation)
+    *child_allocation = real_child_allocation;
+}
+
+static GdkWindow *
+egg_slider_create_child_window (EggSlider      *self,
+                               EggSliderChild *child)
+{
+  GtkWidget *widget = (GtkWidget *)self;
+  GdkWindow *window;
+  GtkAllocation allocation;
+  GdkWindowAttr attributes;
+  gint attributes_mask;
+
+  g_assert (EGG_IS_SLIDER (self));
+  g_assert (child != NULL);
+
+  egg_slider_compute_child_allocation (self, child, &allocation, NULL);
+
+  attributes.window_type = GDK_WINDOW_CHILD;
+  attributes.wclass = GDK_INPUT_OUTPUT;
+  attributes.width = allocation.width;
+  attributes.height = allocation.height;
+  attributes.x = allocation.x;
+  attributes.y = allocation.y;
+  attributes.visual = gtk_widget_get_visual (widget);
+  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
+  attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
+
+  window = gdk_window_new (gtk_widget_get_window (widget), &attributes, attributes_mask);
+  gtk_widget_register_window (widget, window);
+
+  gtk_widget_set_parent_window (child->widget, window);
+
+  return window;
+}
+
+static void
+egg_slider_add (GtkContainer *container,
+               GtkWidget    *widget)
+{
+  EggSlider *self = (EggSlider *)container;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  EggSliderChild *child;
+
+  g_assert (EGG_IS_SLIDER (self));
+  g_assert (GTK_IS_WIDGET (widget));
+
+  child = g_slice_new0 (EggSliderChild);
+  child->position = EGG_SLIDER_NONE;
+  child->widget = g_object_ref (widget);
+
+  g_ptr_array_add (priv->children, child);
+
+  gtk_widget_set_parent (widget, GTK_WIDGET (self));
+
+  if (gtk_widget_get_realized (GTK_WIDGET (self)))
+    child->window = egg_slider_create_child_window (self, child);
+}
+
+static void
+egg_slider_remove (GtkContainer *container,
+                  GtkWidget    *widget)
+{
+  EggSlider *self = (EggSlider *)container;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  EggSliderChild *child;
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+  g_assert (GTK_IS_WIDGET (widget));
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      child = g_ptr_array_index (priv->children, i);
+
+      if (child->widget == widget)
+        {
+          gtk_widget_unparent (widget);
+          g_ptr_array_remove_index (priv->children, i);
+          gtk_widget_queue_resize (GTK_WIDGET (self));
+          break;
+        }
+    }
+}
+
+static void
+egg_slider_size_allocate (GtkWidget     *widget,
+                         GtkAllocation *allocation)
+{
+  EggSlider *self = (EggSlider *)widget;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+  g_assert (allocation != NULL);
+
+  gtk_widget_set_allocation (widget, allocation);
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child = g_ptr_array_index (priv->children, i);
+
+      if (gtk_widget_get_mapped (widget))
+        {
+          if (gtk_widget_get_visible (child->widget))
+            gdk_window_show (child->window);
+          else
+            gdk_window_hide (child->window);
+        }
+
+      if (gtk_widget_get_realized (child->widget))
+        {
+          GtkAllocation window_allocation;
+          GtkAllocation child_allocation;
+
+          egg_slider_compute_child_allocation (self, child, &window_allocation, &child_allocation);
+
+          gdk_window_move_resize (child->window,
+                                  window_allocation.x,
+                                  window_allocation.y,
+                                  window_allocation.width,
+                                  window_allocation.height);
+
+          gtk_widget_size_allocate (child->widget, &child_allocation);
+        }
+    }
+}
+
+static void
+egg_slider_forall (GtkContainer *container,
+                  gboolean      include_internals,
+                  GtkCallback   callback,
+                  gpointer      callback_data)
+{
+  EggSlider *self = (EggSlider *)container;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child;
+
+      child = g_ptr_array_index (priv->children, i);
+      callback (child->widget, callback_data);
+    }
+}
+
+static EggSliderChild *
+egg_slider_get_child (EggSlider  *self,
+                     GtkWidget *widget)
+{
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+  g_assert (GTK_IS_WIDGET (widget));
+  g_assert (gtk_widget_get_parent (widget) == GTK_WIDGET (self));
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child;
+
+      child = g_ptr_array_index (priv->children, i);
+
+      if (child->widget == widget)
+        return child;
+    }
+
+  g_assert_not_reached ();
+
+  return NULL;
+}
+
+static EggSliderPosition
+egg_slider_child_get_position (EggSlider  *self,
+                              GtkWidget *widget)
+{
+  EggSliderChild *child;
+
+  g_assert (EGG_IS_SLIDER (self));
+  g_assert (GTK_IS_WIDGET (widget));
+
+  child = egg_slider_get_child (self, widget);
+
+  return child->position;
+}
+
+static void
+egg_slider_child_set_position (EggSlider         *self,
+                              GtkWidget        *widget,
+                              EggSliderPosition  position)
+{
+  EggSliderChild *child;
+
+  g_assert (EGG_IS_SLIDER (self));
+  g_assert (GTK_IS_WIDGET (widget));
+  g_assert (position >= EGG_SLIDER_NONE);
+  g_assert (position <= EGG_SLIDER_LEFT);
+
+  child = egg_slider_get_child (self, widget);
+
+  if (position != child->position)
+    {
+      child->position = position;
+      gtk_container_child_notify (GTK_CONTAINER (self), widget, "position");
+      gtk_widget_queue_resize (GTK_WIDGET (self));
+    }
+}
+
+static void
+egg_slider_get_child_property (GtkContainer *container,
+                              GtkWidget    *child,
+                              guint         prop_id,
+                              GValue       *value,
+                              GParamSpec   *pspec)
+{
+  EggSlider *self = (EggSlider *)container;
+
+  switch (prop_id)
+    {
+    case CHILD_PROP_POSITION:
+      g_value_set_enum (value, egg_slider_child_get_position (self, child));
+      break;
+
+    default:
+      GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, prop_id, pspec);
+    }
+}
+
+static void
+egg_slider_set_child_property (GtkContainer *container,
+                              GtkWidget    *child,
+                              guint         prop_id,
+                              const GValue *value,
+                              GParamSpec   *pspec)
+{
+  EggSlider *self = (EggSlider *)container;
+
+  switch (prop_id)
+    {
+    case CHILD_PROP_POSITION:
+      egg_slider_child_set_position (self, child, g_value_get_enum (value));
+      break;
+
+    default:
+      GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, prop_id, pspec);
+    }
+}
+
+static void
+egg_slider_get_preferred_height (GtkWidget *widget,
+                                gint      *min_height,
+                                gint      *nat_height)
+{
+  EggSlider *self = (EggSlider *)widget;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  gint real_min_height = 0;
+  gint real_nat_height = 0;
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child;
+      gint child_min_height = 0;
+      gint child_nat_height = 0;
+
+      child = g_ptr_array_index (priv->children, i);
+
+      if ((child->position == EGG_SLIDER_NONE) && gtk_widget_get_visible (child->widget))
+        {
+          gtk_widget_get_preferred_height (child->widget, &child_min_height, &child_nat_height);
+          real_min_height = MAX (real_min_height, child_min_height);
+          real_nat_height = MAX (real_nat_height, child_nat_height);
+        }
+    }
+
+  *min_height = real_min_height;
+  *nat_height = real_nat_height;
+}
+
+static void
+egg_slider_get_preferred_width (GtkWidget *widget,
+                                gint      *min_width,
+                                gint      *nat_width)
+{
+  EggSlider *self = (EggSlider *)widget;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  gint real_min_width = 0;
+  gint real_nat_width = 0;
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child;
+      gint child_min_width = 0;
+      gint child_nat_width = 0;
+
+      child = g_ptr_array_index (priv->children, i);
+
+      if ((child->position == EGG_SLIDER_NONE) && gtk_widget_get_visible (child->widget))
+        {
+          gtk_widget_get_preferred_width (child->widget, &child_min_width, &child_nat_width);
+          real_min_width = MAX (real_min_width, child_min_width);
+          real_nat_width = MAX (real_nat_width, child_nat_width);
+        }
+    }
+
+  *min_width = real_min_width;
+  *nat_width = real_nat_width;
+}
+
+static void
+egg_slider_realize (GtkWidget *widget)
+{
+  EggSlider *self = (EggSlider *)widget;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  GdkWindow *window;
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+
+  gtk_widget_set_realized (widget, TRUE);
+
+  window = gtk_widget_get_parent_window (widget);
+  gtk_widget_set_window (widget, window);
+  g_object_ref (window);
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child;
+
+      child = g_ptr_array_index (priv->children, i);
+
+      if (child->window == NULL)
+        child->window = egg_slider_create_child_window (self, child);
+    }
+}
+
+static void
+egg_slider_unrealize (GtkWidget *widget)
+{
+  EggSlider *self = (EggSlider *)widget;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child;
+
+      child = g_ptr_array_index (priv->children, i);
+
+      if (child->window != NULL)
+        {
+          gtk_widget_set_parent_window (child->widget, NULL);
+          gtk_widget_unregister_window (widget, child->window);
+          gdk_window_destroy (child->window);
+          child->window = NULL;
+        }
+    }
+
+  GTK_WIDGET_CLASS (egg_slider_parent_class)->unrealize (widget);
+}
+
+static void
+egg_slider_map (GtkWidget *widget)
+{
+  EggSlider *self = (EggSlider *)widget;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+
+  GTK_WIDGET_CLASS (egg_slider_parent_class)->map (widget);
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child;
+
+      child = g_ptr_array_index (priv->children, i);
+
+      if ((child->window != NULL) &&
+          gtk_widget_get_visible (child->widget) &&
+          gtk_widget_get_child_visible (child->widget))
+        gdk_window_show (child->window);
+    }
+}
+
+static void
+egg_slider_unmap (GtkWidget *widget)
+{
+  EggSlider *self = (EggSlider *)widget;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+  gsize i;
+
+  g_assert (EGG_IS_SLIDER (self));
+
+  for (i = 0; i < priv->children->len; i++)
+    {
+      EggSliderChild *child;
+
+      child = g_ptr_array_index (priv->children, i);
+
+      if ((child->window != NULL) && gdk_window_is_visible (child->window))
+        gdk_window_hide (child->window);
+    }
+
+  GTK_WIDGET_CLASS (egg_slider_parent_class)->unmap (widget);
+}
+
+static void
+egg_slider_add_child (GtkBuildable *buildable,
+                     GtkBuilder   *builder,
+                     GObject      *child,
+                     const gchar  *type)
+{
+  EggSliderPosition position = EGG_SLIDER_NONE;
+
+  g_assert (GTK_IS_BUILDABLE (buildable));
+  g_assert (GTK_IS_BUILDER (builder));
+  g_assert (G_IS_OBJECT (child));
+
+  if (!GTK_IS_WIDGET (child))
+    {
+      g_warning ("Child \"%s\" must be of type GtkWidget.",
+                 g_type_name (G_OBJECT_TYPE (child)));
+      return;
+    }
+
+  if (g_str_equal (type, "bottom"))
+    position = EGG_SLIDER_BOTTOM;
+  else if (g_str_equal (type, "top"))
+    position = EGG_SLIDER_TOP;
+  else if (g_str_equal (type, "left"))
+    position = EGG_SLIDER_LEFT;
+  else if (g_str_equal (type, "right"))
+    position = EGG_SLIDER_RIGHT;
+
+  gtk_container_add_with_properties (GTK_CONTAINER (buildable), GTK_WIDGET (child),
+                                     "position", position,
+                                     NULL);
+}
+
+static void
+egg_slider_finalize (GObject *object)
+{
+  EggSlider *self = (EggSlider *)object;
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+
+  g_clear_object (&priv->h_adj);
+  g_clear_object (&priv->v_adj);
+  g_clear_pointer (&priv->children, g_ptr_array_unref);
+
+  clear_weak_pointer (&priv->h_anim);
+  clear_weak_pointer (&priv->v_anim);
+
+  G_OBJECT_CLASS (egg_slider_parent_class)->finalize (object);
+}
+
+static void
+egg_slider_get_property (GObject    *object,
+                        guint       prop_id,
+                        GValue     *value,
+                        GParamSpec *pspec)
+{
+  EggSlider *self = EGG_SLIDER (object);
+
+  switch (prop_id)
+    {
+    case PROP_POSITION:
+      g_value_set_enum (value, egg_slider_get_position (self));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+egg_slider_set_property (GObject      *object,
+                        guint         prop_id,
+                        const GValue *value,
+                        GParamSpec   *pspec)
+{
+  EggSlider *self = EGG_SLIDER (object);
+
+  switch (prop_id)
+    {
+    case PROP_POSITION:
+      egg_slider_set_position (self, g_value_get_enum (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+buildable_iface_init (GtkBuildableIface *iface)
+{
+  iface->add_child = egg_slider_add_child;
+}
+
+static void
+egg_slider_class_init (EggSliderClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
+
+  object_class->finalize = egg_slider_finalize;
+  object_class->get_property = egg_slider_get_property;
+  object_class->set_property = egg_slider_set_property;
+
+  widget_class->get_preferred_height = egg_slider_get_preferred_height;
+  widget_class->get_preferred_width = egg_slider_get_preferred_width;
+  widget_class->map = egg_slider_map;
+  widget_class->realize = egg_slider_realize;
+  widget_class->size_allocate = egg_slider_size_allocate;
+  widget_class->unmap = egg_slider_unmap;
+  widget_class->unrealize = egg_slider_unrealize;
+
+  container_class->add = egg_slider_add;
+  container_class->forall = egg_slider_forall;
+  container_class->get_child_property = egg_slider_get_child_property;
+  container_class->remove = egg_slider_remove;
+  container_class->set_child_property = egg_slider_set_child_property;
+
+  properties [PROP_POSITION] =
+    g_param_spec_enum ("position",
+                       "Position",
+                       "Which slider child is visible.",
+                       EGG_TYPE_SLIDER_POSITION,
+                       EGG_SLIDER_NONE,
+                       (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_properties (object_class, LAST_PROP, properties);
+
+  gtk_container_class_install_child_property (container_class,
+                                              CHILD_PROP_POSITION,
+                                              g_param_spec_enum ("position",
+                                                                 "Position",
+                                                                 "Position",
+                                                                 EGG_TYPE_SLIDER_POSITION,
+                                                                 EGG_SLIDER_NONE,
+                                                                 G_PARAM_READWRITE | 
G_PARAM_STATIC_STRINGS));
+}
+
+static void
+egg_slider_init (EggSlider *self)
+{
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+
+  priv->position = EGG_SLIDER_NONE;
+  priv->children = g_ptr_array_new_with_free_func ((GDestroyNotify)egg_slider_child_free);
+
+  priv->v_adj = g_object_new (GTK_TYPE_ADJUSTMENT,
+                              "lower", -1.0,
+                              "upper", 1.0,
+                              "value", 0.0,
+                              NULL);
+  g_signal_connect_object (priv->v_adj,
+                           "value-changed",
+                           G_CALLBACK (gtk_widget_queue_resize),
+                           self,
+                           G_CONNECT_SWAPPED);
+
+  priv->h_adj = g_object_new (GTK_TYPE_ADJUSTMENT,
+                              "lower", -1.0,
+                              "upper", 1.0,
+                              "value", 0.0,
+                              NULL);
+  g_signal_connect_object (priv->h_adj,
+                           "value-changed",
+                           G_CALLBACK (gtk_widget_queue_resize),
+                           self,
+                           G_CONNECT_SWAPPED);
+
+  gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
+}
+
+GType
+egg_slider_position_get_type (void)
+{
+  static GType type_id;
+  static const GEnumValue values[] = {
+    { EGG_SLIDER_NONE, "EGG_SLIDER_NONE", "none" },
+    { EGG_SLIDER_TOP, "EGG_SLIDER_TOP", "top" },
+    { EGG_SLIDER_RIGHT, "EGG_SLIDER_RIGHT", "right" },
+    { EGG_SLIDER_BOTTOM, "EGG_SLIDER_BOTTOM", "bottom" },
+    { EGG_SLIDER_LEFT, "EGG_SLIDER_LEFT", "left" },
+  };
+
+  if (g_once_init_enter (&type_id))
+    {
+      GType _type_id;
+
+      _type_id = g_enum_register_static ("EggSliderPosition", values);
+      g_once_init_leave (&type_id, _type_id);
+    }
+
+  return type_id;
+}
+
+GtkWidget *
+egg_slider_new (void)
+{
+  return g_object_new (EGG_TYPE_SLIDER, NULL);
+}
+
+EggSliderPosition
+egg_slider_get_position (EggSlider *self)
+{
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+
+  g_return_val_if_fail (EGG_IS_SLIDER (self), EGG_SLIDER_NONE);
+
+  return priv->position;
+}
+
+void
+egg_slider_set_position (EggSlider         *self,
+                        EggSliderPosition  position)
+{
+  EggSliderPrivate *priv = egg_slider_get_instance_private (self);
+
+  g_return_if_fail (EGG_IS_SLIDER (self));
+  g_return_if_fail (position >= EGG_SLIDER_NONE);
+  g_return_if_fail (position <= EGG_SLIDER_LEFT);
+
+  if (priv->position != position)
+    {
+      GdkFrameClock *frame_clock;
+      EggAnimation *anim;
+      gdouble v_value;
+      gdouble h_value;
+
+      priv->position = position;
+
+      if (priv->h_anim)
+        egg_animation_stop (priv->h_anim);
+      clear_weak_pointer (&priv->h_anim);
+
+      if (priv->v_anim)
+        egg_animation_stop (priv->v_anim);
+      clear_weak_pointer (&priv->v_anim);
+
+      switch (position)
+        {
+        case EGG_SLIDER_NONE:
+          h_value = 0.0;
+          v_value = 0.0;
+          break;
+
+        case EGG_SLIDER_TOP:
+          h_value = 0.0;
+          v_value = 1.0;
+          break;
+
+        case EGG_SLIDER_RIGHT:
+          h_value = -1.0;
+          v_value = 0.0;
+          break;
+
+        case EGG_SLIDER_BOTTOM:
+          h_value = 0.0;
+          v_value = -1.0;
+          break;
+
+        case EGG_SLIDER_LEFT:
+          h_value = 1.0;
+          v_value = 0.0;
+          break;
+
+        default:
+          g_return_if_reached ();
+        }
+
+      frame_clock = gtk_widget_get_frame_clock (GTK_WIDGET (self));
+
+      anim = egg_object_animate (priv->h_adj,
+                                 ANIMATION_MODE,
+                                 ANIMATION_DURATION,
+                                 frame_clock,
+                                 "value", h_value,
+                                 NULL);
+      set_weak_pointer (&priv->h_anim, anim);
+
+      anim = egg_object_animate (priv->v_adj,
+                                 ANIMATION_MODE,
+                                 ANIMATION_DURATION,
+                                 frame_clock,
+                                 "value", v_value,
+                                 NULL);
+      set_weak_pointer (&priv->v_anim, anim);
+
+      g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_POSITION]);
+      gtk_widget_queue_resize (GTK_WIDGET (self));
+    }
+}
diff --git a/contrib/egg/egg-slider.h b/contrib/egg/egg-slider.h
new file mode 100644
index 0000000..a37b851
--- /dev/null
+++ b/contrib/egg/egg-slider.h
@@ -0,0 +1,56 @@
+/* egg-slider.h
+ *
+ * Copyright (C) 2015 Christian Hergert <christian hergert me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef EGG_SLIDER_H
+#define EGG_SLIDER_H
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define EGG_TYPE_SLIDER          (egg_slider_get_type())
+#define EGG_TYPE_SLIDER_POSITION (egg_slider_position_get_type())
+
+G_DECLARE_DERIVABLE_TYPE (EggSlider, egg_slider, EGG, SLIDER, GtkContainer)
+
+typedef enum
+{
+  EGG_SLIDER_NONE,
+  EGG_SLIDER_TOP,
+  EGG_SLIDER_RIGHT,
+  EGG_SLIDER_BOTTOM,
+  EGG_SLIDER_LEFT,
+} EggSliderPosition;
+
+struct _EggSliderClass
+{
+  GtkContainerClass parent_instance;
+};
+
+GType             egg_slider_position_get_type (void);
+GtkWidget        *egg_slider_new               (void);
+void              egg_slider_add_slider        (EggSlider        *self,
+                                               GtkWidget       *widget,
+                                               GtkPositionType  position);
+EggSliderPosition  egg_slider_get_position      (EggSlider         *self);
+void              egg_slider_set_position      (EggSlider         *self,
+                                               EggSliderPosition  position);
+
+G_END_DECLS
+
+#endif /* EGG_SLIDER_H */


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