From 4158405c0b9d32dd0c6cc1844bc06561b8513766 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?F=C3=A9lix?= <Miadim>
Date: Fri, 19 Mar 2021 23:36:28 +0100
Subject: VSE: Add move_to_meta RNA API function

This function can be used to move strips into meta strips with no
side effects like change of selection state.

Reviewed By: ISS

Differential Revision: https://developer.blender.org/D10759
---
 source/blender/makesrna/intern/rna_sequencer_api.c | 22 ++++++++++++++++++++++
 source/blender/sequencer/SEQ_edit.h                |  3 +++
 source/blender/sequencer/intern/strip_edit.c       | 22 ++++++++++++++++++++++
 3 files changed, 47 insertions(+)

diff --git a/source/blender/makesrna/intern/rna_sequencer_api.c b/source/blender/makesrna/intern/rna_sequencer_api.c
index 00d8c43a111..04ca3cfdb32 100644
--- a/source/blender/makesrna/intern/rna_sequencer_api.c
+++ b/source/blender/makesrna/intern/rna_sequencer_api.c
@@ -81,6 +81,23 @@ static void rna_Sequence_swap_internal(Sequence *seq_self,
   }
 }
 
+static void rna_Sequences_move_strip_to_meta(ID *id,
+                                             Sequence *seq_self,
+                                             Main *bmain,
+                                             Sequence *meta_dst)
+{
+  Scene *scene = (Scene *)id;
+
+  /* Move strip to meta */
+  SEQ_edit_move_strip_to_meta(scene, seq_self, meta_dst);
+
+  /* Udate depsgraph */
+  DEG_relations_tag_update(bmain);
+  DEG_id_tag_update(&scene->id, ID_RECALC_SEQUENCER_STRIPS);
+
+  WM_main_add_notifier(NC_SCENE | ND_SEQUENCER, scene);
+}
+
 static Sequence *rna_Sequences_new_clip(ID *id,
                                         ListBase *seqbase,
                                         Main *bmain,
@@ -607,6 +624,11 @@ void RNA_api_sequence_strip(StructRNA *srna)
   parm = RNA_def_pointer(func, "other", "Sequence", "Other", "");
   RNA_def_parameter_flags(parm, PROP_NEVER_NULL, PARM_REQUIRED);
 
+  func = RNA_def_function(srna, "move_to_meta", "rna_Sequences_move_strip_to_meta");
+  RNA_def_function_flag(func, FUNC_USE_SELF_ID | FUNC_USE_MAIN);
+  parm = RNA_def_pointer(func, "meta_sequence", "Sequence", "Destination Meta Sequence", "Meta to move the strip into");
+  RNA_def_parameter_flags(parm, PROP_NEVER_NULL, PARM_REQUIRED);
+
   func = RNA_def_function(srna, "invalidate_cache", "rna_Sequence_invalidate_cache_rnafunc");
   RNA_def_function_flag(func, FUNC_USE_SELF_ID);
   RNA_def_function_ui_description(func,
diff --git a/source/blender/sequencer/SEQ_edit.h b/source/blender/sequencer/SEQ_edit.h
index c8f11803ca8..38ce665563c 100644
--- a/source/blender/sequencer/SEQ_edit.h
+++ b/source/blender/sequencer/SEQ_edit.h
@@ -33,6 +33,9 @@ struct Scene;
 struct Sequence;
 
 int SEQ_edit_sequence_swap(struct Sequence *seq_a, struct Sequence *seq_b, const char **error_str);
+int SEQ_edit_move_strip_to_meta(struct Scene *scene,
+                                struct Sequence *src_seq,
+                                struct Sequence *dst_seqm);
 void SEQ_edit_flag_for_removal(struct Scene *scene,
                                struct ListBase *seqbase,
                                struct Sequence *seq);
diff --git a/source/blender/sequencer/intern/strip_edit.c b/source/blender/sequencer/intern/strip_edit.c
index bba026057d2..e21a25a7e4f 100644
--- a/source/blender/sequencer/intern/strip_edit.c
+++ b/source/blender/sequencer/intern/strip_edit.c
@@ -43,9 +43,11 @@
 #include "SEQ_add.h"
 #include "SEQ_edit.h"
 #include "SEQ_effects.h"
+#include "SEQ_relations.h"
 #include "SEQ_sequencer.h"
 #include "SEQ_time.h"
 #include "SEQ_transform.h"
+#include "SEQ_utils.h"
 
 int SEQ_edit_sequence_swap(Sequence *seq_a, Sequence *seq_b, const char **error_str)
 {
@@ -102,6 +104,26 @@ int SEQ_edit_sequence_swap(Sequence *seq_a, Sequence *seq_b, const char **error_
   return 1;
 }
 
+int SEQ_edit_move_strip_to_meta(Scene *scene, Sequence *src_seq, Sequence *dst_seqm)
+{
+  /* Find the appropriate seqbase */
+  Editing *ed = SEQ_editing_get(scene, false);
+  ListBase *seqbase = SEQ_get_seqbase_by_seq(&ed->seqbase, src_seq);
+
+  /* Move to meta */
+  BLI_remlink(seqbase, src_seq);
+  BLI_addtail(&dst_seqm->seqbase, src_seq);
+  SEQ_relations_invalidate_cache_preprocessed(scene, src_seq);
+
+  /* Update meta */
+  SEQ_time_update_sequence(scene, dst_seqm);
+  if (SEQ_transform_test_overlap(&dst_seqm->seqbase, src_seq)) {
+    SEQ_transform_seqbase_shuffle(&dst_seqm->seqbase, src_seq, scene);
+  }
+
+  return 0;
+}
+
 static void seq_update_muting_recursive(ListBase *seqbasep, Sequence *metaseq, int mute)
 {
   Sequence *seq;
-- 
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