+static void
+gtk_style_context_update (GdkFrameClock *clock,
+ GtkStyleContext *context)
+{
+ _gtk_style_context_queue_invalidate (context, GTK_CSS_CHANGE_ANIMATE);
+}
+
+static gboolean
+gtk_style_context_is_animating (GtkStyleContext *context)
+{
+ GtkStyleContextPrivate *priv = context->priv;
+
+ return priv->animating;
+}
+
+static void
+gtk_style_context_disconnect_update (GtkStyleContext *context)
+{
+ GtkStyleContextPrivate *priv = context->priv;
+
+ if (priv->frame_clock && priv->frame_clock_update_id)
+ {
+ g_signal_handler_disconnect (priv->frame_clock,
+ priv->frame_clock_update_id);
+ priv->frame_clock_update_id = 0;
+ gdk_frame_clock_end_updating (priv->frame_clock);
+ }
+}
+
+static void
+gtk_style_context_connect_update (GtkStyleContext *context)
+{
+ GtkStyleContextPrivate *priv = context->priv;
+
+ if (priv->frame_clock && priv->frame_clock_update_id == 0)
+ {
+ priv->frame_clock_update_id = g_signal_connect (priv->frame_clock,
+ "update",
+ G_CALLBACK (gtk_style_context_update),
+ context);
+ gdk_frame_clock_begin_updating (priv->frame_clock);
+ }
+}
+
+static void
+gtk_style_context_stop_animating (GtkStyleContext *context)
+{
+ GtkStyleContextPrivate *priv = context->priv;
+
+ if (!gtk_style_context_is_animating (context))
+ return;
+
+ priv->animating = FALSE;
+
+ gtk_style_context_disconnect_update (context);
+}
+
+static void
+gtk_style_context_start_animating (GtkStyleContext *context)
+{
+ GtkStyleContextPrivate *priv = context->priv;
+
+ if (gtk_style_context_is_animating (context))
+ return;
+
+ priv->animating = TRUE;
+
+ gtk_style_context_connect_update (context);
+}
+
+static gboolean
+gtk_style_context_should_animate (GtkStyleContext *context)
+{
+ GtkStyleContextPrivate *priv;
+ StyleData *data;
+ gboolean animate;
+
+ priv = context->priv;
+
+ if (priv->widget == NULL)
+ return FALSE;
+
+ if (!gtk_widget_get_mapped (priv->widget))
+ return FALSE;
+
+ data = style_data_lookup (context);
+ if (!style_data_is_animating (data))
+ return FALSE;
+
+ g_object_get (gtk_widget_get_settings (context->priv->widget),
+ "gtk-enable-animations", &animate,
+ NULL);
+
+ return animate;
+}
+
+void
+_gtk_style_context_update_animating (GtkStyleContext *context)
+{
+ if (gtk_style_context_should_animate (context))
+ gtk_style_context_start_animating (context);
+ else
+ gtk_style_context_stop_animating (context);
+}
+