added base 'block' node

app/node/block/block.cpp

@@ -22,7 +22,17 @@
 
 Block::Block()
 {
+  previous_input_ = new NodeInput();
+  AddParameter(previous_input_);
 
+  previous_output_ = new NodeOutput();
+  AddParameter(previous_output_);
+
+  next_input_ = new NodeInput();
+  AddParameter(next_input_);
+
+  next_output_ = new NodeOutput();
+  AddParameter(next_output_);
 }
 
 QString Block::Category()
@@ -30,7 +40,41 @@ QString Block::Category()
   return tr("Block");
 }
 
+rational Block::in()
+{
+  rational in_point = 0;
+
+  Block* block = previous();
+
+  while (block != nullptr) {
+    in_point += block->length();
+
+    block = previous();
+  }
+
+  return in_point;
+}
+
 rational Block::out()
 {
   return in() + length();
 }
+
+Block *Block::previous()
+{
+  return ValueToPtr<Block>(previous_input_->get_value(0));
+}
+
+Block *Block::next()
+{
+  return ValueToPtr<Block>(next_input_->get_value(0));
+}
+
+void Block::Process(const rational &time)
+{
+  Q_UNUSED(time)
+
+  // Simply set both output values as a pointer to this object
+  previous_output_->set_value(PtrToValue(this));
+  next_output_->set_value(PtrToValue(this));
+}