From 7d999c5ab8474f2422d0cb100a4c52fda38ba46e Mon Sep 17 00:00:00 2001
From: Anton Belka <antonbelka@gmail.com>
Date: Wed, 24 Apr 2013 15:18:01 +0300
Subject: [PATCH] timeline: add auto-transition

API:
 ges_timeline_get_auto_transition
 ges_timeline_set_auto_transition
 GESTimeline::auto-transition
---
 docs/libs/ges-sections.txt |  2 ++
 ges/ges-timeline.c         | 73 ++++++++++++++++++++++++++++++++++++++
 ges/ges-timeline.h         |  3 ++
 3 files changed, 78 insertions(+)

diff --git a/docs/libs/ges-sections.txt b/docs/libs/ges-sections.txt
index b64bf33c81..2b0a8c3187 100644
--- a/docs/libs/ges-sections.txt
+++ b/docs/libs/ges-sections.txt
@@ -274,6 +274,8 @@ ges_timeline_get_layers
 ges_timeline_get_track_for_pad
 ges_timeline_get_duration
 ges_timeline_get_project
+ges_timeline_get_auto_transition
+ges_timeline_set_auto_transition
 <SUBSECTION Standard>
 GESTimelinePrivate
 GESTimelineClass
diff --git a/ges/ges-timeline.c b/ges/ges-timeline.c
index b41ef93cff..9fe5d1e241 100644
--- a/ges/ges-timeline.c
+++ b/ges/ges-timeline.c
@@ -124,6 +124,9 @@ struct _GESTimelinePrivate
   /* The duration of the timeline */
   gint64 duration;
 
+  /* The auto-transition of the timeline */
+  gboolean auto_transition;
+
   /* Timeline edition modes and snapping management */
   guint64 snapping_distance;
 
@@ -177,6 +180,7 @@ enum
 {
   PROP_0,
   PROP_DURATION,
+  PROP_AUTO_TRANSITION,
   PROP_SNAPPING_DISTANCE,
   PROP_UPDATE,
   PROP_LAST
@@ -255,6 +259,9 @@ ges_timeline_get_property (GObject * object, guint property_id,
     case PROP_DURATION:
       g_value_set_uint64 (value, timeline->priv->duration);
       break;
+    case PROP_AUTO_TRANSITION:
+      g_value_set_boolean (value, timeline->priv->auto_transition);
+      break;
     case PROP_SNAPPING_DISTANCE:
       g_value_set_uint64 (value, timeline->priv->snapping_distance);
       break;
@@ -273,6 +280,9 @@ ges_timeline_set_property (GObject * object, guint property_id,
   GESTimeline *timeline = GES_TIMELINE (object);
 
   switch (property_id) {
+    case PROP_AUTO_TRANSITION:
+      ges_timeline_set_auto_transition (timeline, g_value_get_boolean (value));
+      break;
     case PROP_SNAPPING_DISTANCE:
       timeline->priv->snapping_distance = g_value_get_uint64 (value);
       break;
@@ -369,6 +379,15 @@ ges_timeline_class_init (GESTimelineClass * klass)
       properties[PROP_DURATION]);
 
   /**
+   * GESTimeline:auto-transition:
+   *
+   * Sets whether transitions are added automagically when clips overlap.
+   */
+  g_object_class_install_property (object_class, PROP_AUTO_TRANSITION,
+      g_param_spec_boolean ("auto-transition", "Auto-Transition",
+          "whether the transitions are added", FALSE, G_PARAM_READWRITE));
+
+  /** 
    * GESTimeline:snapping-distance:
    *
    * Distance (in nanoseconds) from which a moving object will snap
@@ -512,6 +531,7 @@ ges_timeline_init (GESTimeline * self)
   self->layers = NULL;
   self->tracks = NULL;
   self->priv->duration = 0;
+  self->priv->auto_transition = FALSE;
   priv->snapping_distance = 0;
 
   /* Move context initialization */
@@ -2302,6 +2322,7 @@ ges_timeline_append_layer (GESTimeline * timeline)
 gboolean
 ges_timeline_add_layer (GESTimeline * timeline, GESLayer * layer)
 {
+  gboolean auto_transition;
   GList *objects, *tmp;
 
   GST_DEBUG ("timeline:%p, layer:%p", timeline, layer);
@@ -2318,6 +2339,14 @@ ges_timeline_add_layer (GESTimeline * timeline, GESLayer * layer)
     return FALSE;
   }
 
+  auto_transition = ges_layer_get_auto_transition (layer);
+
+  /* If the user doesn't explicitely set layer auto_transition, then set our */
+  if (!auto_transition) {
+    auto_transition = ges_timeline_get_auto_transition (timeline);
+    ges_layer_set_auto_transition (layer, auto_transition);
+  }
+
   gst_object_ref_sink (layer);
   timeline->layers = g_list_insert_sorted (timeline->layers, layer,
       (GCompareFunc) sort_layers);
@@ -2714,3 +2743,47 @@ ges_timeline_get_duration (GESTimeline * timeline)
 
   return timeline->priv->duration;
 }
+
+/**
+ * ges_timeline_get_auto_transition:
+ * @timeline: a #GESTimeline
+ *
+ * Gets whether transitions are automatically added when objects
+ * overlap or not.
+ *
+ * Returns: %TRUE if transitions are automatically added, else %FALSE.
+ */
+gboolean
+ges_timeline_get_auto_transition (GESTimeline * timeline)
+{
+  g_return_val_if_fail (GES_IS_TIMELINE (timeline), 0);
+
+  return timeline->priv->auto_transition;
+}
+
+/**
+ * ges_timeline_set_auto_transition:
+ * @timeline: a #GESLayer
+ * @auto_transition: whether the auto_transition is active
+ *
+ * Sets the layer to the given @auto_transition. See the documentation of the
+ * property auto_transition for more information.
+ */
+void
+ges_timeline_set_auto_transition (GESTimeline * timeline,
+    gboolean auto_transition)
+{
+  GList *layers;
+  GESLayer *layer;
+
+  g_return_if_fail (GES_IS_TIMELINE (timeline));
+
+  timeline->priv->auto_transition = auto_transition;
+  g_object_notify (G_OBJECT (timeline), "auto-transition");
+
+  layers = timeline->layers;
+  for (; layers; layers = layers->next) {
+    layer = layers->data;
+    ges_layer_set_auto_transition (layer, auto_transition);
+  }
+}
diff --git a/ges/ges-timeline.h b/ges/ges-timeline.h
index 787708a424..3e29a07916 100644
--- a/ges/ges-timeline.h
+++ b/ges/ges-timeline.h
@@ -121,6 +121,9 @@ gboolean ges_timeline_is_updating (GESTimeline * timeline);
 
 GstClockTime ges_timeline_get_duration (GESTimeline *timeline);
 
+gboolean ges_timeline_get_auto_transition (GESTimeline * timeline);
+void ges_timeline_set_auto_transition (GESTimeline * timeline, gboolean auto_transition);
+
 G_END_DECLS
 
 #endif /* _GES_TIMELINE */