GESTimelineObject: add a ges_timeline_object_set_top_effect_priority method

Lets the user have a minimum of control over effects priorities

docs/libs/ges-sections.txt

@@ -287,6 +287,7 @@ ges_timeline_object_find_track_object
 ges_timeline_object_add_track_object
 ges_timeline_object_get_effects
 ges_timeline_object_get_top_effect_position
+ges_timeline_object_set_top_effect_priority
 <SUBSECTION Standard>
 GES_TIMELINE_OBJECT_DURATION
 GES_TIMELINE_OBJECT_INPOINT

ges/ges-timeline-object.c

@@ -844,6 +844,55 @@ ges_timeline_object_get_top_effect_position (GESTimelineObject * object,
       GES_TRACK_OBJECT (effect))->priority_offset;
 }
 
+/**
+* ges_timeline_object_set_top_effect_priority:
+*
+* @object: The origin #GESTimelineObject
+* @effect: The #GESTrackEffect to move
+* @newpriority: the new position at which to move the @effect inside this
+* #GESTimelineObject
+*
+* This is a convenience method that lets you set the priority of a top effect.
+*
+* Returns: %TRUE if @effect was successfuly moved, %FALSE otherwize.
+*/
+gboolean
+ges_timeline_object_set_top_effect_priority (GESTimelineObject * object,
+    GESTrackOperation * effect, guint newpriority)
+{
+  GList *tmp;
+  guint inc;
+  GESTrackObject *tck_obj = GES_TRACK_OBJECT (effect);
+  GESTimelineObjectPrivate *priv = object->priv;
+
+  /*  We don't change the priority */
+  if (tck_obj->priority == newpriority ||
+      (newpriority > (object->priv->nb_effects - 1)) ||
+      (G_UNLIKELY (ges_track_object_get_timeline_object (tck_obj) != object))) {
+    return FALSE;
+  } else if (tck_obj->priority < newpriority)
+    inc = -1;
+  else
+    inc = +1;
+
+  ges_track_object_set_priority (tck_obj, newpriority);
+  for (tmp = priv->trackobjects; tmp; tmp = tmp->next) {
+    GESTrackObject *tmpo = GES_TRACK_OBJECT (tmp->data);
+    guint tck_priority = ges_track_object_get_priority (tmpo);
+
+    if ((inc == +1 && tck_priority >= newpriority) ||
+        (inc == -1 && tck_priority <= newpriority)) {
+      ges_track_object_set_priority (tmpo, tck_priority + inc);
+    }
+  }
+
+  /*  We keep the list of trackobjects sorted */
+  priv->trackobjects = g_list_sort_with_data (priv->trackobjects,
+      (GCompareDataFunc) sort_track_effects, object);
+
+  return TRUE;
+}
+
 static void
 update_height (GESTimelineObject * object)
 {

ges/ges-timeline-object.h

@@ -248,6 +248,10 @@ gint
 ges_timeline_object_get_top_effect_position (GESTimelineObject *object,
             GESTrackOperation *effect);
 
+gboolean
+ges_timeline_object_set_top_effect_priority (GESTimelineObject *object,
+      GESTrackOperation *effect, guint newpriority);
+
 G_END_DECLS
 
 #endif /* _GES_TIMELINE_OBJECT */

tests/check/ges/effects.c

@@ -218,8 +218,88 @@ GST_START_TEST (test_tl_effect)
         GES_TRACK_OPERATION (tmp->data));
     fail_unless (priority > effect_prio);
     fail_unless (GES_IS_TRACK_EFFECT (tmp->data));
-    fail_unless (ges_track_object_get_track (GES_TRACK_OBJECT (tmp->
-                data))->type == track_type[i]);
+    fail_unless (ges_track_object_get_track (GES_TRACK_OBJECT (tmp->data))->
+        type == track_type[i]);
+    effect_prio = priority;
+
+    g_object_unref (tmp->data);
+  }
+  g_list_free (effects);
+
+  ges_timeline_layer_remove_object (layer, (GESTimelineObject *) tl_effect);
+
+  g_object_unref (timeline);
+}
+
+GST_END_TEST;
+
+GST_START_TEST (test_priorities_tl_object)
+{
+  GESTimeline *timeline;
+  GESTimelineLayer *layer;
+  GESTrack *track_audio, *track_video;
+  GESTimelineEffect *tl_effect;
+  GESTrackEffect *tck_effect, *tck_effect1;
+  GList *effects, *tmp;
+  gint i, tl_object_height;
+  gint effect_prio = -1;
+
+  ges_init ();
+
+  timeline = ges_timeline_new ();
+  layer = (GESTimelineLayer *) ges_simple_timeline_layer_new ();
+  track_audio = ges_track_audio_raw_new ();
+  track_video = ges_track_video_raw_new ();
+
+  ges_timeline_add_track (timeline, track_audio);
+  ges_timeline_add_track (timeline, track_video);
+  ges_timeline_add_layer (timeline, layer);
+
+  GST_DEBUG ("Create effect");
+  tl_effect = ges_timeline_effect_new_from_bin_desc ("identity", "identity");
+
+  g_object_set (tl_effect, "duration", 25 * GST_SECOND, NULL);
+
+  ges_simple_timeline_layer_add_object ((GESSimpleTimelineLayer *) (layer),
+      (GESTimelineObject *) tl_effect, 0);
+
+  tck_effect = ges_track_effect_new_from_bin_desc ("identity");
+  fail_unless (ges_timeline_object_add_track_object (GES_TIMELINE_OBJECT
+          (tl_effect), GES_TRACK_OBJECT (tck_effect)));
+  fail_unless (ges_track_add_object (track_video,
+          GES_TRACK_OBJECT (tck_effect)));
+
+  g_object_get (tl_effect, "height", &tl_object_height, NULL);
+  fail_unless (tl_object_height == 3);
+
+  tck_effect1 = ges_track_effect_new_from_bin_desc ("identity");
+  fail_unless (ges_timeline_object_add_track_object (GES_TIMELINE_OBJECT
+          (tl_effect), GES_TRACK_OBJECT (tck_effect1)));
+  fail_unless (ges_track_add_object (track_audio,
+          GES_TRACK_OBJECT (tck_effect1)));
+
+  fail_unless (ges_timeline_object_set_top_effect_priority (GES_TIMELINE_OBJECT
+          (tl_effect), GES_TRACK_OPERATION (tck_effect1), 0));
+
+  fail_unless (ges_track_object_get_priority (GES_TRACK_OBJECT (tck_effect)) ==
+      3);
+
+  fail_unless (ges_timeline_object_set_top_effect_priority (GES_TIMELINE_OBJECT
+          (tl_effect), GES_TRACK_OPERATION (tck_effect1), 3));
+  fail_unless (ges_track_object_get_priority (GES_TRACK_OBJECT (tck_effect)) ==
+      2);
+
+  g_object_get (tl_effect, "height", &tl_object_height, NULL);
+  fail_unless (tl_object_height == 4);
+
+  effects = ges_timeline_object_get_effects (GES_TIMELINE_OBJECT (tl_effect));
+  for (tmp = effects, i = 0; tmp; tmp = tmp->next, i++) {
+    gint priority =
+        ges_timeline_object_get_top_effect_position (GES_TIMELINE_OBJECT
+        (tl_effect),
+        GES_TRACK_OPERATION (tmp->data));
+    fail_unless (priority > effect_prio);
+    fail_unless (GES_IS_TRACK_EFFECT (tmp->data));
     effect_prio = priority;
 
     g_object_unref (tmp->data);
@@ -245,6 +325,7 @@ ges_suite (void)
   tcase_add_test (tc_chain, test_add_effect_to_tl_object);
   tcase_add_test (tc_chain, test_get_effects_from_tl);
   tcase_add_test (tc_chain, test_tl_effect);
+  tcase_add_test (tc_chain, test_priorities_tl_object);
 
   return s;
 }