Adding upstream version 3.38.2.upstream/3.38.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1183 insertions, 0 deletions

diff --git a/src/animation/egg-animation.c b/src/animation/egg-animation.c
new file mode 100644
index 0000000..7ceba88
--- /dev/null
+++ b/src/animation/egg-animation.c
@@ -0,0 +1,1183 @@
+/* egg-animation.c
+ *
+ * Copyright (C) 2010-2016 Christian Hergert <christian@hergert.me>
+ *
+ * This file 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 2.1 of the License, or (at your option)
+ * any later version.
+ *
+ * This file 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 General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib/gi18n.h>
+#include <gobject/gvaluecollector.h>
+#include <gdk/gdk.h>
+#include <gtk/gtk.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "animation/egg-animation.h"
+#include "animation/egg-frame-source.h"
+
+#define FALLBACK_FRAME_RATE 60
+
+typedef gdouble (*AlphaFunc) (gdouble       offset);
+typedef void    (*TweenFunc) (const GValue *begin,
+                              const GValue *end,
+                              GValue       *value,
+                              gdouble       offset);
+
+typedef struct
+{
+  gboolean    is_child;  /* Does GParamSpec belong to parent widget */
+  GParamSpec *pspec;     /* GParamSpec of target property */
+  GValue      begin;     /* Begin value in animation */
+  GValue      end;       /* End value in animation */
+} Tween;
+
+
+struct _EggAnimation
+{
+  GInitiallyUnowned  parent_instance;
+
+  gpointer           target;              /* Target object to animate */
+  guint64            begin_msec;          /* Time in which animation started */
+  guint              duration_msec;       /* Duration of animation */
+  guint              mode;                /* Tween mode */
+  gulong             tween_handler;       /* GSource or signal handler */
+  gulong             after_paint_handler; /* signal handler */
+  gdouble            last_offset;         /* Track our last offset */
+  GArray            *tweens;              /* Array of tweens to perform */
+  GdkFrameClock     *frame_clock;         /* An optional frame-clock for sync. */
+  GDestroyNotify     notify;              /* Notify callback */
+  gpointer           notify_data;         /* Data for notify */
+};
+
+G_DEFINE_TYPE (EggAnimation, egg_animation, G_TYPE_INITIALLY_UNOWNED)
+
+enum {
+  PROP_0,
+  PROP_DURATION,
+  PROP_FRAME_CLOCK,
+  PROP_MODE,
+  PROP_TARGET,
+  LAST_PROP
+};
+
+
+enum {
+  TICK,
+  LAST_SIGNAL
+};
+
+
+/*
+ * Helper macros.
+ */
+#define LAST_FUNDAMENTAL 64
+#define TWEEN(type)                                       \
+  static void                                             \
+  tween_ ## type (const GValue * begin,                   \
+                  const GValue * end,                     \
+                  GValue * value,                         \
+                  gdouble offset)                         \
+  {                                                       \
+    g ## type x = g_value_get_ ## type (begin);           \
+    g ## type y = g_value_get_ ## type (end);             \
+    g_value_set_ ## type (value, x + ((y - x) * offset)); \
+  }
+
+
+/*
+ * Globals.
+ */
+static AlphaFunc   alpha_funcs[EGG_ANIMATION_LAST];
+static gboolean    debug;
+static GParamSpec *properties[LAST_PROP];
+static guint       signals[LAST_SIGNAL];
+static TweenFunc   tween_funcs[LAST_FUNDAMENTAL];
+static guint       slow_down_factor = 1;
+
+
+/*
+ * Tweeners for basic types.
+ */
+TWEEN (int);
+TWEEN (uint);
+TWEEN (long);
+TWEEN (ulong);
+TWEEN (float);
+TWEEN (double);
+
+
+/**
+ * egg_animation_alpha_ease_in_cubic:
+ * @offset: (in): The position within the animation; 0.0 to 1.0.
+ *
+ * An alpha function to transform the offset within the animation.
+ * @EGG_ANIMATION_CUBIC means the valu ewill be transformed into
+ * cubic acceleration (x * x * x).
+ */
+static gdouble
+egg_animation_alpha_ease_in_cubic (gdouble offset)
+{
+  return offset * offset * offset;
+}
+
+
+static gdouble
+egg_animation_alpha_ease_out_cubic (gdouble offset)
+{
+  gdouble p = offset - 1.0;
+
+  return p * p * p + 1.0;
+}
+
+static gdouble
+egg_animation_alpha_ease_in_out_cubic (gdouble offset)
+{
+  if (offset < .5)
+    return egg_animation_alpha_ease_in_cubic (offset * 2.0) / 2.0;
+  else
+    return .5 + egg_animation_alpha_ease_out_cubic ((offset - .5) * 2.0) / 2.0;
+}
+
+
+/**
+ * egg_animation_alpha_linear:
+ * @offset: (in): The position within the animation; 0.0 to 1.0.
+ *
+ * An alpha function to transform the offset within the animation.
+ * @EGG_ANIMATION_LINEAR means no tranformation will be made.
+ *
+ * Returns: @offset.
+ * Side effects: None.
+ */
+static gdouble
+egg_animation_alpha_linear (gdouble offset)
+{
+  return offset;
+}
+
+
+/**
+ * egg_animation_alpha_ease_in_quad:
+ * @offset: (in): The position within the animation; 0.0 to 1.0.
+ *
+ * An alpha function to transform the offset within the animation.
+ * @EGG_ANIMATION_EASE_IN_QUAD means that the value will be transformed
+ * into a quadratic acceleration.
+ *
+ * Returns: A tranformation of @offset.
+ * Side effects: None.
+ */
+static gdouble
+egg_animation_alpha_ease_in_quad (gdouble offset)
+{
+  return offset * offset;
+}
+
+
+/**
+ * egg_animation_alpha_ease_out_quad:
+ * @offset: (in): The position within the animation; 0.0 to 1.0.
+ *
+ * An alpha function to transform the offset within the animation.
+ * @EGG_ANIMATION_EASE_OUT_QUAD means that the value will be transformed
+ * into a quadratic deceleration.
+ *
+ * Returns: A tranformation of @offset.
+ * Side effects: None.
+ */
+static gdouble
+egg_animation_alpha_ease_out_quad (gdouble offset)
+{
+  return -1.0 * offset * (offset - 2.0);
+}
+
+
+/**
+ * egg_animation_alpha_ease_in_out_quad:
+ * @offset: (in): The position within the animation; 0.0 to 1.0.
+ *
+ * An alpha function to transform the offset within the animation.
+ * @EGG_ANIMATION_EASE_IN_OUT_QUAD means that the value will be transformed
+ * into a quadratic acceleration for the first half, and quadratic
+ * deceleration the second half.
+ *
+ * Returns: A tranformation of @offset.
+ * Side effects: None.
+ */
+static gdouble
+egg_animation_alpha_ease_in_out_quad (gdouble offset)
+{
+  offset *= 2.0;
+  if (offset < 1.0)
+    return 0.5 * offset * offset;
+  offset -= 1.0;
+  return -0.5 * (offset * (offset - 2.0) - 1.0);
+}
+
+
+/**
+ * egg_animation_load_begin_values:
+ * @animation: (in): A #EggAnimation.
+ *
+ * Load the begin values for all the properties we are about to
+ * animate.
+ *
+ * Side effects: None.
+ */
+static void
+egg_animation_load_begin_values (EggAnimation *animation)
+{
+  GtkContainer *container;
+  Tween *tween;
+  guint i;
+
+  g_return_if_fail (EGG_IS_ANIMATION (animation));
+
+  for (i = 0; i < animation->tweens->len; i++)
+    {
+      tween = &g_array_index (animation->tweens, Tween, i);
+      g_value_reset (&tween->begin);
+      if (tween->is_child)
+        {
+          container = GTK_CONTAINER (gtk_widget_get_parent (animation->target));
+          gtk_container_child_get_property (container,
+                                            animation->target,
+                                            tween->pspec->name,
+                                            &tween->begin);
+        }
+      else
+        {
+          g_object_get_property (animation->target,
+                                 tween->pspec->name,
+                                 &tween->begin);
+        }
+    }
+}
+
+
+/**
+ * egg_animation_unload_begin_values:
+ * @animation: (in): A #EggAnimation.
+ *
+ * Unloads the begin values for the animation. This might be particularly
+ * useful once we support pointer types.
+ *
+ * Side effects: None.
+ */
+static void
+egg_animation_unload_begin_values (EggAnimation *animation)
+{
+  Tween *tween;
+  guint i;
+
+  g_return_if_fail (EGG_IS_ANIMATION (animation));
+
+  for (i = 0; i < animation->tweens->len; i++)
+    {
+      tween = &g_array_index (animation->tweens, Tween, i);
+      g_value_reset (&tween->begin);
+    }
+}
+
+
+/**
+ * egg_animation_get_offset:
+ * @animation: A #EggAnimation.
+ * @frame_time: the time to present the frame, or 0 for current timing.
+ *
+ * Retrieves the position within the animation from 0.0 to 1.0. This
+ * value is calculated using the msec of the beginning of the animation
+ * and the current time.
+ *
+ * Returns: The offset of the animation from 0.0 to 1.0.
+ */
+static gdouble
+egg_animation_get_offset (EggAnimation *animation,
+                          gint64        frame_time)
+{
+  gdouble offset;
+  gint64 frame_msec;
+
+  g_return_val_if_fail (EGG_IS_ANIMATION (animation), 0.0);
+
+  if (frame_time == 0)
+    {
+      if (animation->frame_clock != NULL)
+        frame_time = gdk_frame_clock_get_frame_time (animation->frame_clock);
+      else
+        frame_time = g_get_monotonic_time ();
+    }
+
+  frame_msec = frame_time / 1000L;
+
+  offset = (gdouble) (frame_msec - animation->begin_msec) /
+           (gdouble) MAX (animation->duration_msec, 1);
+
+  return CLAMP (offset, 0.0, 1.0);
+}
+
+
+/**
+ * egg_animation_update_property:
+ * @animation: (in): A #EggAnimation.
+ * @target: (in): A #GObject.
+ * @tween: (in): a #Tween containing the property.
+ * @value: (in): The new value for the property.
+ *
+ * Updates the value of a property on an object using @value.
+ *
+ * Side effects: The property of @target is updated.
+ */
+static void
+egg_animation_update_property (EggAnimation  *animation,
+                              gpointer      target,
+                              Tween        *tween,
+                              const GValue *value)
+{
+  g_assert (EGG_IS_ANIMATION (animation));
+  g_assert (G_IS_OBJECT (target));
+  g_assert (tween);
+  g_assert (value);
+
+  g_object_set_property (target, tween->pspec->name, value);
+}
+
+
+/**
+ * egg_animation_update_child_property:
+ * @animation: (in): A #EggAnimation.
+ * @target: (in): A #GObject.
+ * @tween: (in): A #Tween containing the property.
+ * @value: (in): The new value for the property.
+ *
+ * Updates the value of the parent widget of the target to @value.
+ *
+ * Side effects: The property of @target<!-- -->'s parent widget is updated.
+ */
+static void
+egg_animation_update_child_property (EggAnimation *animation,
+                                     gpointer      target,
+                                     Tween        *tween,
+                                     const GValue *value)
+{
+  GtkWidget *parent;
+
+  g_assert (EGG_IS_ANIMATION (animation));
+  g_assert (G_IS_OBJECT (target));
+  g_assert (tween);
+  g_assert (value);
+
+  parent = gtk_widget_get_parent (GTK_WIDGET (target));
+  gtk_container_child_set_property (GTK_CONTAINER (parent),
+                                    target,
+                                    tween->pspec->name,
+                                    value);
+}
+
+
+/**
+ * egg_animation_get_value_at_offset:
+ * @animation: (in): A #EggAnimation.
+ * @offset: (in): The offset in the animation from 0.0 to 1.0.
+ * @tween: (in): A #Tween containing the property.
+ * @value: (out): A #GValue in which to store the property.
+ *
+ * Retrieves a value for a particular position within the animation.
+ *
+ * Side effects: None.
+ */
+static void
+egg_animation_get_value_at_offset (EggAnimation *animation,
+                                   gdouble       offset,
+                                   Tween        *tween,
+                                   GValue       *value)
+{
+  g_return_if_fail (EGG_IS_ANIMATION (animation));
+  g_return_if_fail (tween != NULL);
+  g_return_if_fail (value != NULL);
+  g_return_if_fail (value->g_type == tween->pspec->value_type);
+
+  if (value->g_type < LAST_FUNDAMENTAL)
+    {
+      /*
+       * If you hit the following assertion, you need to add a function
+       * to create the new value at the given offset.
+       */
+      g_assert (tween_funcs[value->g_type]);
+      tween_funcs[value->g_type](&tween->begin, &tween->end, value, offset);
+    }
+  else
+    {
+      /*
+       * TODO: Support complex transitions.
+       */
+      if (offset >= 1.0)
+        g_value_copy (&tween->end, value);
+    }
+}
+
+static void
+egg_animation_set_frame_clock (EggAnimation  *animation,
+                               GdkFrameClock *frame_clock)
+{
+  if (animation->frame_clock != frame_clock)
+    {
+      g_clear_object (&animation->frame_clock);
+      animation->frame_clock = frame_clock ? g_object_ref (frame_clock) : NULL;
+    }
+}
+
+static void
+egg_animation_set_target (EggAnimation *animation,
+                          gpointer      target)
+{
+  g_assert (!animation->target);
+
+  animation->target = g_object_ref (target);
+
+  if (GTK_IS_WIDGET (animation->target))
+    egg_animation_set_frame_clock (animation,
+                                  gtk_widget_get_frame_clock (animation->target));
+}
+
+
+/**
+ * egg_animation_tick:
+ * @animation: (in): A #EggAnimation.
+ *
+ * Moves the object properties to the next position in the animation.
+ *
+ * Returns: %TRUE if the animation has not completed; otherwise %FALSE.
+ * Side effects: None.
+ */
+static gboolean
+egg_animation_tick (EggAnimation *animation,
+                    gdouble       offset)
+{
+  gdouble alpha;
+  GValue value = { 0 };
+  Tween *tween;
+  guint i;
+
+  g_return_val_if_fail (EGG_IS_ANIMATION (animation), FALSE);
+
+  if (offset == animation->last_offset)
+    return offset < 1.0;
+
+  alpha = alpha_funcs[animation->mode](offset);
+
+  /*
+   * Update property values.
+   */
+  for (i = 0; i < animation->tweens->len; i++)
+    {
+      tween = &g_array_index (animation->tweens, Tween, i);
+      g_value_init (&value, tween->pspec->value_type);
+      egg_animation_get_value_at_offset (animation, alpha, tween, &value);
+      if (!tween->is_child)
+        {
+          egg_animation_update_property (animation,
+                                        animation->target,
+                                        tween,
+                                        &value);
+        }
+      else
+        {
+          egg_animation_update_child_property (animation,
+                                              animation->target,
+                                              tween,
+                                              &value);
+        }
+      g_value_unset (&value);
+    }
+
+  /*
+   * Notify anyone interested in the tick signal.
+   */
+  g_signal_emit (animation, signals[TICK], 0);
+
+  /*
+   * Flush any outstanding events to the graphics server (in the case of X).
+   */
+#if !GTK_CHECK_VERSION (3, 13, 0)
+  if (GTK_IS_WIDGET (animation->target))
+    {
+      GdkWindow *window;
+
+      if ((window = gtk_widget_get_window (GTK_WIDGET (animation->target))))
+        gdk_window_flush (window);
+    }
+#endif
+
+  animation->last_offset = offset;
+
+  return offset < 1.0;
+}
+
+
+/**
+ * egg_animation_timeout_cb:
+ * @user_data: (in): A #EggAnimation.
+ *
+ * Timeout from the main loop to move to the next step of the animation.
+ *
+ * Returns: %TRUE until the animation has completed; otherwise %FALSE.
+ * Side effects: None.
+ */
+static gboolean
+egg_animation_timeout_cb (gpointer user_data)
+{
+  EggAnimation *animation = user_data;
+  gboolean ret;
+  gdouble offset;
+
+  offset = egg_animation_get_offset (animation, 0);
+
+  if (!(ret = egg_animation_tick (animation, offset)))
+    egg_animation_stop (animation);
+
+  return ret;
+}
+
+
+static gboolean
+egg_animation_widget_tick_cb (GdkFrameClock *frame_clock,
+                              EggAnimation  *animation)
+{
+  gboolean ret = G_SOURCE_REMOVE;
+
+  g_assert (GDK_IS_FRAME_CLOCK (frame_clock));
+  g_assert (EGG_IS_ANIMATION (animation));
+
+  if (animation->tween_handler)
+    {
+      gdouble offset;
+
+      offset = egg_animation_get_offset (animation, 0);
+
+      if (!(ret = egg_animation_tick (animation, offset)))
+        egg_animation_stop (animation);
+    }
+
+  return ret;
+}
+
+
+static void
+egg_animation_widget_after_paint_cb (GdkFrameClock *frame_clock,
+                                     EggAnimation  *animation)
+{
+  gint64 base_time;
+  gint64 interval;
+  gint64 next_frame_time;
+  gdouble offset;
+
+  g_assert (GDK_IS_FRAME_CLOCK (frame_clock));
+  g_assert (EGG_IS_ANIMATION (animation));
+
+  base_time = gdk_frame_clock_get_frame_time (frame_clock);
+  gdk_frame_clock_get_refresh_info (frame_clock, base_time, &interval, &next_frame_time);
+
+  offset = egg_animation_get_offset (animation, next_frame_time);
+
+  egg_animation_tick (animation, offset);
+}
+
+
+/**
+ * egg_animation_start:
+ * @animation: (in): A #EggAnimation.
+ *
+ * Start the animation. When the animation stops, the internal reference will
+ * be dropped and the animation may be finalized.
+ *
+ * Side effects: None.
+ */
+void
+egg_animation_start (EggAnimation *animation)
+{
+  g_return_if_fail (EGG_IS_ANIMATION (animation));
+  g_return_if_fail (!animation->tween_handler);
+
+  g_object_ref_sink (animation);
+  egg_animation_load_begin_values (animation);
+
+  if (animation->frame_clock)
+    {
+      animation->begin_msec = gdk_frame_clock_get_frame_time (animation->frame_clock) / 1000UL;
+      animation->tween_handler =
+        g_signal_connect (animation->frame_clock,
+                          "update",
+                          G_CALLBACK (egg_animation_widget_tick_cb),
+                          animation);
+      animation->after_paint_handler =
+        g_signal_connect (animation->frame_clock,
+                          "after-paint",
+                          G_CALLBACK (egg_animation_widget_after_paint_cb),
+                          animation);
+      gdk_frame_clock_begin_updating (animation->frame_clock);
+    }
+  else
+    {
+      animation->begin_msec = g_get_monotonic_time () / 1000UL;
+      animation->tween_handler = egg_frame_source_add (FALLBACK_FRAME_RATE,
+                                                       egg_animation_timeout_cb,
+                                                       animation);
+    }
+}
+
+
+static void
+egg_animation_notify (EggAnimation *self)
+{
+  g_assert (EGG_IS_ANIMATION (self));
+
+  if (self->notify != NULL)
+    {
+      GDestroyNotify notify = self->notify;
+      gpointer data = self->notify_data;
+
+      self->notify = NULL;
+      self->notify_data = NULL;
+
+      notify (data);
+    }
+}
+
+
+/**
+ * egg_animation_stop:
+ * @animation: (in): A #EggAnimation.
+ *
+ * Stops a running animation. The internal reference to the animation is
+ * dropped and therefore may cause the object to finalize.
+ *
+ * Side effects: None.
+ */
+void
+egg_animation_stop (EggAnimation *animation)
+{
+  g_return_if_fail (EGG_IS_ANIMATION (animation));
+
+  if (animation->tween_handler)
+    {
+      if (animation->frame_clock)
+        {
+          gdk_frame_clock_end_updating (animation->frame_clock);
+          g_clear_signal_handler (&animation->tween_handler, animation->frame_clock);
+          g_clear_signal_handler (&animation->after_paint_handler, animation->frame_clock);
+        }
+      else
+        {
+          g_source_remove (animation->tween_handler);
+          animation->tween_handler = 0;
+        }
+      egg_animation_unload_begin_values (animation);
+      egg_animation_notify (animation);
+      g_object_unref (animation);
+    }
+}
+
+
+/**
+ * egg_animation_add_property:
+ * @animation: (in): A #EggAnimation.
+ * @pspec: (in): A #ParamSpec of @target or a #GtkWidget<!-- -->'s parent.
+ * @value: (in): The new value for the property at the end of the animation.
+ *
+ * Adds a new property to the set of properties to be animated during the
+ * lifetime of the animation.
+ *
+ * Side effects: None.
+ */
+void
+egg_animation_add_property (EggAnimation *animation,
+                            GParamSpec   *pspec,
+                            const GValue *value)
+{
+  Tween tween = { 0 };
+  GType type;
+
+  g_return_if_fail (EGG_IS_ANIMATION (animation));
+  g_return_if_fail (pspec != NULL);
+  g_return_if_fail (value != NULL);
+  g_return_if_fail (value->g_type);
+  g_return_if_fail (animation->target);
+  g_return_if_fail (!animation->tween_handler);
+
+  type = G_TYPE_FROM_INSTANCE (animation->target);
+  tween.is_child = !g_type_is_a (type, pspec->owner_type);
+  if (tween.is_child)
+    {
+      if (!GTK_IS_WIDGET (animation->target))
+        {
+          g_critical (_("Cannot locate property %s in class %s"),
+                      pspec->name, g_type_name (type));
+          return;
+        }
+    }
+
+  tween.pspec = g_param_spec_ref (pspec);
+  g_value_init (&tween.begin, pspec->value_type);
+  g_value_init (&tween.end, pspec->value_type);
+  g_value_copy (value, &tween.end);
+  g_array_append_val (animation->tweens, tween);
+}
+
+
+/**
+ * egg_animation_dispose:
+ * @object: (in): A #EggAnimation.
+ *
+ * Releases any object references the animation contains.
+ *
+ * Side effects: None.
+ */
+static void
+egg_animation_dispose (GObject *object)
+{
+  EggAnimation *self = EGG_ANIMATION (object);
+
+  g_clear_object (&self->target);
+  g_clear_object (&self->frame_clock);
+
+  G_OBJECT_CLASS (egg_animation_parent_class)->dispose (object);
+}
+
+
+/**
+ * egg_animation_finalize:
+ * @object: (in): A #EggAnimation.
+ *
+ * Finalizes the object and releases any resources allocated.
+ *
+ * Side effects: None.
+ */
+static void
+egg_animation_finalize (GObject *object)
+{
+  EggAnimation *self = EGG_ANIMATION (object);
+  Tween *tween;
+  guint i;
+
+  for (i = 0; i < self->tweens->len; i++)
+    {
+      tween = &g_array_index (self->tweens, Tween, i);
+      g_value_unset (&tween->begin);
+      g_value_unset (&tween->end);
+      g_param_spec_unref (tween->pspec);
+    }
+
+  g_array_unref (self->tweens);
+
+  G_OBJECT_CLASS (egg_animation_parent_class)->finalize (object);
+}
+
+
+/**
+ * egg_animation_set_property:
+ * @object: (in): A #GObject.
+ * @prop_id: (in): The property identifier.
+ * @value: (in): The given property.
+ * @pspec: (in): A #ParamSpec.
+ *
+ * Set a given #GObject property.
+ */
+static void
+egg_animation_set_property (GObject      *object,
+                            guint         prop_id,
+                            const GValue *value,
+                            GParamSpec   *pspec)
+{
+  EggAnimation *animation = EGG_ANIMATION (object);
+
+  switch (prop_id)
+    {
+    case PROP_DURATION:
+      animation->duration_msec = g_value_get_uint (value) * slow_down_factor;
+      break;
+
+    case PROP_FRAME_CLOCK:
+      egg_animation_set_frame_clock (animation, g_value_get_object (value));
+      break;
+
+    case PROP_MODE:
+      animation->mode = g_value_get_enum (value);
+      break;
+
+    case PROP_TARGET:
+      egg_animation_set_target (animation, g_value_get_object (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+
+/**
+ * egg_animation_class_init:
+ * @klass: (in): A #EggAnimationClass.
+ *
+ * Initializes the GObjectClass.
+ *
+ * Side effects: Properties, signals, and vtables are initialized.
+ */
+static void
+egg_animation_class_init (EggAnimationClass *klass)
+{
+  GObjectClass *object_class;
+  const gchar *slow_down_factor_env;
+
+  debug = !!g_getenv ("EGG_ANIMATION_DEBUG");
+  slow_down_factor_env = g_getenv ("EGG_ANIMATION_SLOW_DOWN_FACTOR");
+
+  if (slow_down_factor_env)
+    slow_down_factor = MAX (1, atoi (slow_down_factor_env));
+
+  object_class = G_OBJECT_CLASS (klass);
+  object_class->dispose = egg_animation_dispose;
+  object_class->finalize = egg_animation_finalize;
+  object_class->set_property = egg_animation_set_property;
+
+  /**
+   * EggAnimation:duration:
+   *
+   * The "duration" property is the total number of milliseconds that the
+   * animation should run before being completed.
+   */
+  properties[PROP_DURATION] =
+    g_param_spec_uint ("duration",
+                       "Duration",
+                       "The duration of the animation",
+                       0,
+                       G_MAXUINT,
+                       250,
+                       (G_PARAM_WRITABLE |
+                        G_PARAM_CONSTRUCT_ONLY |
+                        G_PARAM_STATIC_STRINGS));
+
+  properties[PROP_FRAME_CLOCK] =
+    g_param_spec_object ("frame-clock",
+                         "Frame Clock",
+                         "An optional frame-clock to synchronize with.",
+                         GDK_TYPE_FRAME_CLOCK,
+                         (G_PARAM_WRITABLE |
+                          G_PARAM_CONSTRUCT_ONLY |
+                          G_PARAM_STATIC_STRINGS));
+
+  /**
+   * EggAnimation:mode:
+   *
+   * The "mode" property is the Alpha function that should be used to
+   * determine the offset within the animation based on the current
+   * offset in the animations duration.
+   */
+  properties[PROP_MODE] =
+    g_param_spec_enum ("mode",
+                       "Mode",
+                       "The animation mode",
+                       EGG_TYPE_ANIMATION_MODE,
+                       EGG_ANIMATION_LINEAR,
+                       (G_PARAM_WRITABLE |
+                        G_PARAM_CONSTRUCT_ONLY |
+                        G_PARAM_STATIC_STRINGS));
+
+  /**
+   * EggAnimation:target:
+   *
+   * The "target" property is the #GObject that should have its properties
+   * animated.
+   */
+  properties[PROP_TARGET] =
+    g_param_spec_object ("target",
+                         "Target",
+                         "The target of the animation",
+                         G_TYPE_OBJECT,
+                         (G_PARAM_WRITABLE |
+                          G_PARAM_CONSTRUCT_ONLY |
+                          G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_properties (object_class, LAST_PROP, properties);
+
+  /**
+   * EggAnimation::tick:
+   *
+   * The "tick" signal is emitted on each frame in the animation.
+   */
+  signals[TICK] = g_signal_new ("tick",
+                                 EGG_TYPE_ANIMATION,
+                                 G_SIGNAL_RUN_FIRST,
+                                 0,
+                                 NULL, NULL, NULL,
+                                 G_TYPE_NONE,
+                                 0);
+
+#define SET_ALPHA(_T, _t) \
+  alpha_funcs[EGG_ANIMATION_ ## _T] = egg_animation_alpha_ ## _t
+
+  SET_ALPHA (LINEAR, linear);
+  SET_ALPHA (EASE_IN_QUAD, ease_in_quad);
+  SET_ALPHA (EASE_OUT_QUAD, ease_out_quad);
+  SET_ALPHA (EASE_IN_OUT_QUAD, ease_in_out_quad);
+  SET_ALPHA (EASE_IN_CUBIC, ease_in_cubic);
+  SET_ALPHA (EASE_OUT_CUBIC, ease_out_cubic);
+  SET_ALPHA (EASE_IN_OUT_CUBIC, ease_in_out_cubic);
+
+#define SET_TWEEN(_T, _t) \
+  G_STMT_START { \
+    guint idx = G_TYPE_ ## _T; \
+    tween_funcs[idx] = tween_ ## _t; \
+  } G_STMT_END
+
+  SET_TWEEN (INT, int);
+  SET_TWEEN (UINT, uint);
+  SET_TWEEN (LONG, long);
+  SET_TWEEN (ULONG, ulong);
+  SET_TWEEN (FLOAT, float);
+  SET_TWEEN (DOUBLE, double);
+}
+
+
+/**
+ * egg_animation_init:
+ * @animation: (in): A #EggAnimation.
+ *
+ * Initializes the #EggAnimation instance.
+ *
+ * Side effects: Everything.
+ */
+static void
+egg_animation_init (EggAnimation *animation)
+{
+  animation->duration_msec = 250;
+  animation->mode = EGG_ANIMATION_EASE_IN_OUT_QUAD;
+  animation->tweens = g_array_new (FALSE, FALSE, sizeof (Tween));
+  animation->last_offset = -G_MINDOUBLE;
+}
+
+
+/**
+ * egg_animation_mode_get_type:
+ *
+ * Retrieves the GType for #EggAnimationMode.
+ *
+ * Returns: A GType.
+ * Side effects: GType registered on first call.
+ */
+GType
+egg_animation_mode_get_type (void)
+{
+  static GType type_id = 0;
+  static const GEnumValue values[] = {
+    { EGG_ANIMATION_LINEAR, "EGG_ANIMATION_LINEAR", "linear" },
+    { EGG_ANIMATION_EASE_IN_QUAD, "EGG_ANIMATION_EASE_IN_QUAD", "ease-in-quad" },
+    { EGG_ANIMATION_EASE_IN_OUT_QUAD, "EGG_ANIMATION_EASE_IN_OUT_QUAD", "ease-in-out-quad" },
+    { EGG_ANIMATION_EASE_OUT_QUAD, "EGG_ANIMATION_EASE_OUT_QUAD", "ease-out-quad" },
+    { EGG_ANIMATION_EASE_IN_CUBIC, "EGG_ANIMATION_EASE_IN_CUBIC", "ease-in-cubic" },
+    { EGG_ANIMATION_EASE_OUT_CUBIC, "EGG_ANIMATION_EASE_OUT_CUBIC", "ease-out-cubic" },
+    { EGG_ANIMATION_EASE_IN_OUT_CUBIC, "EGG_ANIMATION_EASE_IN_OUT_CUBIC", "ease-in-out-cubic" },
+    { 0 }
+  };
+
+  if (G_UNLIKELY (!type_id))
+    type_id = g_enum_register_static ("EggAnimationMode", values);
+  return type_id;
+}
+
+/**
+ * egg_object_animatev:
+ * @object: A #GObject.
+ * @mode: The animation mode.
+ * @duration_msec: The duration in milliseconds.
+ * @frame_clock: (nullable): The #GdkFrameClock to synchronize to.
+ * @first_property: The first property to animate.
+ * @args: A variadac list of arguments
+ *
+ * Returns: (transfer none): A #EggAnimation.
+ */
+EggAnimation *
+egg_object_animatev (gpointer          object,
+                     EggAnimationMode  mode,
+                     guint             duration_msec,
+                     GdkFrameClock    *frame_clock,
+                     const gchar      *first_property,
+                     va_list           args)
+{
+  EggAnimation *animation;
+  GObjectClass *klass;
+  GObjectClass *pklass;
+  const gchar *name;
+  GParamSpec *pspec;
+  GtkWidget *parent;
+  GValue value = { 0 };
+  gchar *error = NULL;
+  GType type;
+  GType ptype;
+  gboolean enable_animations;
+
+  g_return_val_if_fail (first_property != NULL, NULL);
+  g_return_val_if_fail (mode < EGG_ANIMATION_LAST, NULL);
+
+  if ((frame_clock == NULL) && GTK_IS_WIDGET (object))
+    frame_clock = gtk_widget_get_frame_clock (GTK_WIDGET (object));
+
+  /*
+   * If we have a frame clock, then we must be in the gtk thread and we
+   * should check GtkSettings for disabled animations. If we are disabled,
+   * we will just make the timeout immediate.
+   */
+  if (frame_clock != NULL)
+    {
+      g_object_get (gtk_settings_get_default (),
+                    "gtk-enable-animations", &enable_animations,
+                    NULL);
+
+      if (enable_animations == FALSE)
+        duration_msec = 0;
+    }
+
+  name = first_property;
+  type = G_TYPE_FROM_INSTANCE (object);
+  klass = G_OBJECT_GET_CLASS (object);
+  animation = g_object_new (EGG_TYPE_ANIMATION,
+                            "duration", duration_msec,
+                            "frame-clock", frame_clock,
+                            "mode", mode,
+                            "target", object,
+                            NULL);
+
+  do
+    {
+      /*
+       * First check for the property on the object. If that does not exist
+       * then check if the object has a parent and look at its child
+       * properties (if it's a GtkWidget).
+       */
+      if (!(pspec = g_object_class_find_property (klass, name)))
+        {
+          if (!g_type_is_a (type, GTK_TYPE_WIDGET))
+            {
+              g_critical (_("Failed to find property %s in %s"),
+                          name, g_type_name (type));
+              goto failure;
+            }
+          if (!(parent = gtk_widget_get_parent (object)))
+            {
+              g_critical (_("Failed to find property %s in %s"),
+                          name, g_type_name (type));
+              goto failure;
+            }
+          pklass = G_OBJECT_GET_CLASS (parent);
+          ptype = G_TYPE_FROM_INSTANCE (parent);
+          if (!(pspec = gtk_container_class_find_child_property (pklass, name)))
+            {
+              g_critical (_("Failed to find property %s in %s or parent %s"),
+                          name, g_type_name (type), g_type_name (ptype));
+              goto failure;
+            }
+        }
+
+      g_value_init (&value, pspec->value_type);
+      G_VALUE_COLLECT (&value, args, 0, &error);
+      if (error != NULL)
+        {
+          g_critical (_("Failed to retrieve va_list value: %s"), error);
+          g_free (error);
+          goto failure;
+        }
+
+      egg_animation_add_property (animation, pspec, &value);
+      g_value_unset (&value);
+    }
+  while ((name = va_arg (args, const gchar *)));
+
+  egg_animation_start (animation);
+
+  return animation;
+
+failure:
+  g_object_ref_sink (animation);
+  g_object_unref (animation);
+  return NULL;
+}
+
+/**
+ * egg_object_animate:
+ * @object: (in): A #GObject.
+ * @mode: (in): The animation mode.
+ * @duration_msec: (in): The duration in milliseconds.
+ * @first_property: (in): The first property to animate.
+ *
+ * Animates the properties of @object. The can be set in a similar manner to g_object_set(). They
+ * will be animated from their current value to the target value over the time period.
+ *
+ * Return value: (transfer none): A #EggAnimation.
+ * Side effects: None.
+ */
+EggAnimation*
+egg_object_animate (gpointer        object,
+                    EggAnimationMode mode,
+                    guint           duration_msec,
+                    GdkFrameClock  *frame_clock,
+                    const gchar    *first_property,
+                    ...)
+{
+  EggAnimation *animation;
+  va_list args;
+
+  va_start (args, first_property);
+  animation = egg_object_animatev (object,
+                                   mode,
+                                   duration_msec,
+                                   frame_clock,
+                                   first_property,
+                                   args);
+  va_end (args);
+
+  return animation;
+}
+
+/**
+ * egg_object_animate_full:
+ *
+ * Return value: (transfer none): A #EggAnimation.
+ */
+EggAnimation*
+egg_object_animate_full (gpointer        object,
+                         EggAnimationMode mode,
+                         guint           duration_msec,
+                         GdkFrameClock  *frame_clock,
+                         GDestroyNotify  notify,
+                         gpointer        notify_data,
+                         const gchar    *first_property,
+                         ...)
+{
+  EggAnimation *animation;
+  va_list args;
+
+  va_start (args, first_property);
+  animation = egg_object_animatev (object,
+                                   mode,
+                                   duration_msec,
+                                   frame_clock,
+                                   first_property,
+                                   args);
+  va_end (args);
+
+  animation->notify = notify;
+  animation->notify_data = notify_data;
+
+  return animation;
+}