feat(parameters): signal on parameter change

src/Engine/Operator/GeometryOperator.cpp

@@ -41,16 +41,24 @@ void nt::GeometryOperator::initParameters()
     {
         std::cout << "name: " << t->getName() << "\n";
         // create parameter
-        parameters_.push_back(
-            std::make_shared<prm::Parameter>(*t)
-        );
+        auto parameter = std::make_shared<prm::Parameter>(*t);
+        parameter->valueChanged.connect(boost::bind(&GeometryOperator::dirtyNode, this));
+
+        parameters_.push_back(parameter);
     }
 
 }
 
+void enzo::nt::GeometryOperator::dirtyNode()
+{
+    dirty_=true;
+    nodeDirtied(opId_);
+}
+
 void enzo::nt::GeometryOperator::cookOp(op::Context context)
 {
     opDef_->cookOp(context);
+    dirty_=false;
 }
 
 geo::Geometry& enzo::nt::GeometryOperator::getOutputGeo(unsigned outputIndex)

src/Engine/Operator/GeometryOperator.h

@@ -29,10 +29,16 @@ public:
     std::vector<std::weak_ptr<prm::Parameter>> getParameters();
     std::weak_ptr<prm::Parameter> getParameter(std::string parameterName);
 
+    void dirtyNode();
+
 
     unsigned int getMaxInputs() const;
     unsigned int getMaxOutputs() const;
 
+    // signals
+    boost::signals2::signal<void (nt::OpId)> nodeDirtied;
+
+
 
 private:
     void initParameters();
@@ -46,5 +52,6 @@ private:
     std::unique_ptr<enzo::nt::GeometryOpDef> opDef_;
     enzo::nt::OpId opId_;
     enzo::op::OpInfo opInfo_;
+    bool dirty_ = true;
 };
 }