docs: Add Behaviour migration guide

diff --git a/doc/reference/clutter/Makefile.am b/doc/reference/clutter/Makefile.am
index 06353f7..f85fe1a 100644 (file)
--- a/doc/reference/clutter/Makefile.am
+++ b/doc/reference/clutter/Makefile.am
@@ -133,7 +133,8 @@ content_files= \
        building-clutter.xml \
        running-clutter.xml \
        migrating-ClutterEffect.xml \
-       migrating-ClutterPath.xml
+       migrating-ClutterPath.xml \
+       migrating-ClutterBehaviour.xml
 
 # SGML files where gtk-doc abbrevations (#GtkWidget) are expanded
 # These files must be listed here *and* in content_files
@@ -147,7 +148,8 @@ expand_content_files= \
        building-clutter.xml \
        running-clutter.xml \
        migrating-ClutterEffect.xml \
-       migrating-ClutterPath.xml
+       migrating-ClutterPath.xml \
+       migrating-ClutterBehaviour.xml
 
 # CFLAGS and LDFLAGS for compiling gtkdoc-scangobj with your library.
 # Only needed if you are using gtkdoc-scangobj to dynamically query widget

diff --git a/doc/reference/clutter/migrating-ClutterBehaviour.xml b/doc/reference/clutter/migrating-ClutterBehaviour.xml
new file mode 100644 (file)
index 0000000..20dd1f6
--- /dev/null
+++ b/doc/reference/clutter/migrating-ClutterBehaviour.xml
@@ -0,0 +1,122 @@
+<?xml version="1.0"?>
+<!DOCTYPE chapter PUBLIC
+  "-//OASIS//DTD DocBook XML V4.3//EN"
+  "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
+]>
+<chapter id="migrating-ClutterBehaviour">
+
+  <chapterinfo>
+    <author>
+      <firstname>Emmanuele</firstname>
+      <surname>Bassi</surname>
+      <affiliation>
+        <address>
+          <email>ebassi@linux.intel.com</email>
+        </address>
+      </affiliation>
+    </author>
+  </chapterinfo>
+
+  <title>Migrating from ClutterBehaviour</title>
+
+  <para>The #ClutterBehaviour class and its sub-classes have been deprecated
+  since Clutter 1.6. The animation framework provided by #ClutterAnimation,
+  #ClutterAnimator and #ClutterState fully replaces all functionality from the
+  #ClutterBehaviour classes.</para>
+
+  <para>Generally, animations using #ClutterBehaviour sub-classes can be
+  effectively re-implemented just by using #ClutterActor properties.</para>
+
+  <para>Here is an example of an animation using a
+  #ClutterBehaviourOpacity instance:</para>
+
+  <informalexample>
+    <programlisting>
+  ClutterTimeline *timeline = clutter_timeline_new (250);
+  ClutterAlpha *alpha = clutter_alpha_new_full (timeline, CLUTTER_LINEAR);
+  ClutterBehaviour *behaviour = clutter_behaviour_opacity_new (alpha, 255, 0);
+
+  clutter_behaviour_apply (behaviour, some_actor);
+
+  clutter_timeline_start (timeline);
+    </programlisting>
+  </informalexample>
+
+  <para>The same effect can be achieved by using clutter_actor_animate() and
+  the #ClutterActor:opacity property:</para>
+
+  <informalexample>
+    <programlisting>
+  clutter_actor_set_opacity (some_actor, 255);
+  clutter_actor_animate (some_actor, CLUTTER_LINEAR, 250,
+                         "opacity", 0,
+                         NULL);
+    </programlisting>
+  </informalexample>
+
+  <para>#ClutterBehaviour<!-- -->s used for continuous animations with looping
+  timelines can still be effectively replaced by looping animations; for
+  instance, the following example of a "pulsating" actor using
+  #ClutterBehaviourScale:</para>
+
+  <informalexample>
+    <programlisting>
+static void
+reverse_timeline (ClutterTimeline *timeline)
+{
+  ClutterTimelineDirection dir = clutter_timeline_get_direction (timeline);
+
+  if (dir == CLUTTER_TIMELINE_FORWARD)
+    dir = CLUTTER_TIMELINE_BACKWARD;
+  else
+    dir = CLUTTER_TIMELINE_FORWARD;
+
+  clutter_timeline_set_direction (timeline, dir);
+}
+
+  ClutterTimeline *timeline = clutter_timeline_new (500);
+  ClutterAlpha *alpha = clutter_alpha_new_full (timeline, CLUTTER_LINEAR);
+  ClutterBehaviour *behaviour;
+
+  g_object_set (some_actor, "scale-gravity", CLUTTER_GRAVITY_CENTER, NULL);
+  behaviour = clutter_behaviour_scale_new (alpha,
+                                           1.0, 2.0,
+                                           1.0, 2.0);
+  clutter_behaviour_apply (behaviour, some_actor);
+
+  g_signal_connect (timeline,
+                    "completed", G_CALLBACK (reverse_timeline),
+                    NULL);
+
+  clutter_timeline_set_loop (timeline);
+  clutter_timeline_start (timeline);
+    </programlisting>
+  </informalexample>
+
+  <para>The same effect can be achieved using a #ClutterAnimation:</para>
+
+  <informalexample>
+    <programlisting>
+  ClutterAnimation *animation =
+    clutter_actor_animate (some_actor, CLUTTER_LINEAR, 500,
+                           "scale-x", 2.0,
+                           "scale-y", 2.0,
+                           "fixed::scale-gravity", CLUTTER_GRAVITY_CENTER,
+                           NULL);
+
+  clutter_animation_set_loop (animation, TRUE);
+
+  g_signal_connect (clutter_animation_get_timeline (animation),
+                    "completed", G_CALLBACK (reverse_timeline),
+                    NULL);
+    </programlisting>
+  </informalexample>
+
+  <para>#ClutterBehaviour sub-classes can be applied to multiple actors, in
+  order to share the duration and the easing mode. It is possible to use the
+  same underlying #ClutterTimeline and #ClutterAlpha instances with
+  #ClutterAnimation to achieve the same effect. Complex animations, spanning
+  multiple actors, should use the #ClutterAnimator and #ClutterState classes
+  instead.</para>
+
+</chapter>