[gtk+] stylecontext: Add new class for animation handling

[Benjamin Otte <otte src gnome org>]

commit 7b7027c971d07ac54844b1fc022f5f14d26ce875
Author: Benjamin Otte <otte redhat com>
Date:   Wed Apr 11 16:00:57 2012 +0200

    stylecontext: Add new class for animation handling
    
    A StyleAnimation is an immutable object used to track the state of CSS
    values. I'd have liked to make it fully immutable - ie not have the
    timestamp in there - but couldn't find a place to sanely store the
    timestamp.
    
    This is an abstract base class. Implementations for this will be added
    later (for both CSS3 transitions and animations, potentially for
    animated images).
    
    Actually aplying the information in this object will be done by a
    different object commtted later.

 gtk/Makefile.am                |    2 +
 gtk/gtkstyleanimation.c        |   82 ++++++++++++++++++++++++++++++++++++++++
 gtk/gtkstyleanimationprivate.h |   67 ++++++++++++++++++++++++++++++++
 3 files changed, 151 insertions(+), 0 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index cc9c302..f8e4c32 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -508,6 +508,7 @@ gtk_private_h_sources =		\
 	gtksettingsprivate.h	\
 	gtksizegroup-private.h	\
 	gtksocketprivate.h	\
+	gtkstyleanimationprivate.h \
 	gtkstylecascadeprivate.h \
 	gtkstylecontextprivate.h \
 	gtkstylepropertiesprivate.h \
@@ -791,6 +792,7 @@ gtk_base_c_sources = 		\
 	gtkstatusbar.c		\
 	gtkstatusicon.c		\
 	gtkstock.c		\
+	gtkstyleanimation.c	\
 	gtkstylecascade.c	\
 	gtkstylecontext.c	\
 	gtkstyleproperties.c	\
diff --git a/gtk/gtkstyleanimation.c b/gtk/gtkstyleanimation.c
new file mode 100644
index 0000000..aab78bd
--- /dev/null
+++ b/gtk/gtkstyleanimation.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright  2012 Red Hat Inc.
+ *
+ * This library 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 library 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 Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+#include "config.h"
+
+#include "gtkstyleanimationprivate.h"
+
+G_DEFINE_ABSTRACT_TYPE (GtkStyleAnimation, _gtk_style_animation, G_TYPE_OBJECT)
+
+static GtkBitmask *
+gtk_style_animation_real_set_values (GtkStyleAnimation    *animation,
+                                     GtkBitmask           *changed,
+                                     gint64                for_time_us,
+                                     GtkCssComputedValues *values)
+{
+  return changed;
+}
+
+static gboolean
+gtk_style_animation_real_is_finished (GtkStyleAnimation *animation,
+                                      gint64             at_time_us)
+{
+  return TRUE;
+}
+
+static void
+_gtk_style_animation_class_init (GtkStyleAnimationClass *klass)
+{
+  klass->set_values = gtk_style_animation_real_set_values;
+  klass->is_finished = gtk_style_animation_real_is_finished;
+}
+
+static void
+_gtk_style_animation_init (GtkStyleAnimation *animation)
+{
+}
+
+GtkBitmask *
+_gtk_style_animation_set_values (GtkStyleAnimation    *animation,
+                                 GtkBitmask           *changed,
+                                 gint64                for_time_us,
+                                 GtkCssComputedValues *values)
+{
+  GtkStyleAnimationClass *klass;
+
+  g_return_val_if_fail (GTK_IS_STYLE_ANIMATION (animation), changed);
+  g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), changed);
+
+  klass = GTK_STYLE_ANIMATION_GET_CLASS (animation);
+
+  return klass->set_values (animation, changed, for_time_us, values);
+}
+
+gboolean
+_gtk_style_animation_is_finished (GtkStyleAnimation *animation,
+                                  gint64             at_time_us)
+{
+  GtkStyleAnimationClass *klass;
+
+  g_return_val_if_fail (GTK_IS_STYLE_ANIMATION (animation), TRUE);
+
+  klass = GTK_STYLE_ANIMATION_GET_CLASS (animation);
+
+  return klass->is_finished (animation, at_time_us);
+}
+
diff --git a/gtk/gtkstyleanimationprivate.h b/gtk/gtkstyleanimationprivate.h
new file mode 100644
index 0000000..5d5d6c6
--- /dev/null
+++ b/gtk/gtkstyleanimationprivate.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright  2012 Red Hat Inc.
+ *
+ * This library 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 library 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 Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+#ifndef __GTK_STYLE_ANIMATION_PRIVATE_H__
+#define __GTK_STYLE_ANIMATION_PRIVATE_H__
+
+#include <glib-object.h>
+#include "gtkcsscomputedvaluesprivate.h"
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_STYLE_ANIMATION           (_gtk_style_animation_get_type ())
+#define GTK_STYLE_ANIMATION(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_STYLE_ANIMATION, GtkStyleAnimation))
+#define GTK_STYLE_ANIMATION_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_STYLE_ANIMATION, GtkStyleAnimationClass))
+#define GTK_IS_STYLE_ANIMATION(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_STYLE_ANIMATION))
+#define GTK_IS_STYLE_ANIMATION_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_STYLE_ANIMATION))
+#define GTK_STYLE_ANIMATION_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_STYLE_ANIMATION, GtkStyleAnimationClass))
+
+typedef struct _GtkStyleAnimation           GtkStyleAnimation;
+typedef struct _GtkStyleAnimationClass      GtkStyleAnimationClass;
+
+struct _GtkStyleAnimation
+{
+  GObject parent;
+};
+
+struct _GtkStyleAnimationClass
+{
+  GObjectClass parent_class;
+
+  gboolean      (* is_finished)                         (GtkStyleAnimation      *animation,
+                                                         gint64                  at_time_us);
+  GtkBitmask *  (* set_values)                          (GtkStyleAnimation      *animation,
+                                                         GtkBitmask             *changed,
+                                                         gint64                  for_time_us,
+                                                         GtkCssComputedValues   *values);
+};
+
+GType           _gtk_style_animation_get_type           (void) G_GNUC_CONST;
+
+GtkBitmask *    _gtk_style_animation_set_values         (GtkStyleAnimation      *animation,
+                                                         GtkBitmask             *changed,
+                                                         gint64                  for_time_us,
+                                                         GtkCssComputedValues   *values) G_GNUC_WARN_UNUSED_RESULT;
+gboolean        _gtk_style_animation_is_finished        (GtkStyleAnimation      *animation,
+                                                         gint64                  at_time_us);
+
+
+G_END_DECLS
+
+#endif /* __GTK_STYLE_ANIMATION_PRIVATE_H__ */