inserting blocks through the timeline implemented

app/node/block/block.cpp

@@ -88,7 +88,7 @@ void Block::Process(const rational &time)
 }
 
 void Block::Refresh()
-{
+{  
   // Set in point to the out point of the previous Node
   if (previous() != nullptr) {
     in_point_ = previous()->out();
@@ -98,22 +98,20 @@ void Block::Refresh()
 
   // Update out point by adding this clip's length to the just calculated in point
   out_point_ = in_point_ + length();
+
+  emit Refreshed();
 }
 
-void Block::RefreshSurrounds()
+void Block::RefreshFollowing()
 {
-  Block* acting_node = previous();
+  Refresh();
 
-  while (acting_node != nullptr) {
-    acting_node->Refresh();
-    acting_node = acting_node->previous();
-  }
+  Block* next_block = next();
 
-  acting_node = next();
+  while (next_block != nullptr) {
+    next_block->Refresh();
 
-  while (acting_node != nullptr) {
-    acting_node->Refresh();
-    acting_node = acting_node->next();
+    next_block = next_block->next();
   }
 }
 
@@ -126,3 +124,15 @@ NodeOutput *Block::block_output()
 {
   return block_output_;
 }
+
+void Block::ConnectBlocks(Block *previous, Block *next)
+{
+  NodeParam::ConnectEdge(previous->block_output(), next->previous_input());
+  NodeParam::ConnectEdge(next->block_output(), previous->next_input());
+}
+
+void Block::DisconnectBlocks(Block *previous, Block *next)
+{
+  NodeParam::DisconnectEdge(previous->block_output(), next->previous_input());
+  NodeParam::DisconnectEdge(next->block_output(), previous->next_input());
+}

app/node/block/block.h

@@ -35,6 +35,13 @@ class Block : public Node
 public:
   Block();
 
+  enum Type {
+    kClip,
+    kGap
+  };
+
+  virtual Type type() = 0;
+
   virtual QString Category() override;
 
   const rational& in();
@@ -52,6 +59,9 @@ public:
   NodeOutput* texture_output();
   NodeOutput* block_output();
 
+  static void ConnectBlocks(Block* previous, Block* next);
+  static void DisconnectBlocks(Block* previous, Block* next);
+
 public slots:
   virtual void Process(const rational &time) override;
 
@@ -70,8 +80,12 @@ public slots:
    */
   void Refresh();
 
+  void RefreshFollowing();
+
+signals:
+  void Refreshed();
+
 protected:
-  void RefreshSurrounds();
 
 private:
   NodeInput* previous_input_;

app/node/block/clip/clip.cpp

@@ -29,6 +29,11 @@ ClipBlock::ClipBlock()
   AddParameter(texture_input_);
 }
 
+Block::Type ClipBlock::type()
+{
+  return kClip;
+}
+
 QString ClipBlock::Name()
 {
   return tr("Clip");
@@ -52,6 +57,8 @@ rational ClipBlock::length()
 void ClipBlock::set_length(const rational &length)
 {
   length_ = length;
+
+  RefreshFollowing();
 }
 
 NodeInput *ClipBlock::texture_input()

app/node/block/clip/clip.h

@@ -32,6 +32,8 @@ class ClipBlock : public Block
 public:
   ClipBlock();
 
+  virtual Type type() override;
+
   virtual QString Name() override;
   virtual QString id() override;
   virtual QString Description() override;

app/node/block/gap/gap.cpp

@@ -24,6 +24,11 @@ GapBlock::GapBlock()
 {
 }
 
+Block::Type GapBlock::type()
+{
+  return kGap;
+}
+
 rational GapBlock::length()
 {
   return length_;
@@ -33,5 +38,5 @@ void GapBlock::set_length(const rational &length)
 {
   length_ = length;
 
-  RefreshSurrounds();
+  RefreshFollowing();
 }

app/node/block/gap/gap.h

@@ -32,6 +32,8 @@ class GapBlock : public Block
 public:
   GapBlock();
 
+  virtual Type type() override;
+
   virtual rational length() override;
   virtual void set_length(const rational &length) override;