added link support to blocks

app/node/block/block.cpp

@@ -135,7 +135,7 @@ void Block::EdgeRemovedSlot(NodeEdgePtr edge)
 }
 
 void Block::Refresh()
-{  
+{
   // Set in point to the out point of the previous Node
   if (previous() != nullptr) {
     in_point_ = previous()->out();
@@ -228,3 +228,39 @@ void Block::CopyParameters(Block *source, Block *dest)
   dest->set_length(source->length());
   dest->set_media_in(source->media_in());
 }
+
+void Block::Link(Block *a, Block *b)
+{
+  if (a == b) {
+    return;
+  }
+
+  // Assume both clips are already linked since Link() and Unlink() should be the only entry points to this array
+  if (a->linked_clips_.contains(b)) {
+    return;
+  }
+
+  a->linked_clips_.append(b);
+  b->linked_clips_.append(a);
+}
+
+void Block::Link(QList<Block *> blocks)
+{
+  foreach (Block* a, blocks) {
+    foreach (Block* b, blocks) {
+      Link(a, b);
+    }
+  }
+}
+
+void Block::Unlink(Block *a, Block *b)
+{
+  a->linked_clips_.removeOne(b);
+  b->linked_clips_.removeOne(a);
+}
+
+const QVector<Block*> &Block::linked_clips()
+{
+  return linked_clips_;
+}
+

app/node/block/block.h

@@ -71,6 +71,11 @@ public:
   const QString& block_name();
   void set_block_name(const QString& name);
 
+  static void Link(Block* a, Block* b);
+  static void Link(QList<Block*> blocks);
+  static void Unlink(Block* a, Block* b);
+  const QVector<Block*>& linked_clips();
+
 public slots:
   /**
    * @brief Refreshes internal cache of in/out points up to date
@@ -104,7 +109,7 @@ protected:
 
   static void CopyParameters(Block* source, Block* dest);
 
-private:  
+private:
   NodeInput* previous_input_;
   NodeOutput* block_output_;
 
@@ -121,6 +126,8 @@ private:
 
   QString block_name_;
 
+  QVector<Block*> linked_clips_;
+
 private slots:
   void EdgeAddedSlot(NodeEdgePtr edge);