created NodeInputArray parameter type

It seems unwise to let NodeInputs take more than one value, but at times
it makes sense to create a list or array of inputs. This class will create
sub-parameters as an easy way to provide variable inputs while also enforcing
one connection per input parameter.

This is also the primary motivation for the previous commit (disambiguating
when a NodeParam's parent is a Node vs some other type).

app/node/CMakeLists.txt

@@ -32,6 +32,8 @@ set(OLIVE_SOURCES
   node/graph.cpp
   node/input.h
   node/input.cpp
+  node/inputarray.h
+  node/inputarray.cpp
   node/keyframe.h
   node/keyframe.cpp
   node/menu.h

app/node/inputarray.cpp

@@ -1,6 +1,55 @@
 #include "inputarray.h"
 
-InputArray::InputArray()
+#include "node.h"
+
+NodeInputArray::NodeInputArray(const QString &id) :
+  NodeInput(id)
 {
 
 }
+
+int NodeInputArray::GetSize() const
+{
+  return sub_params_.size();
+}
+
+void NodeInputArray::SetSize(int size)
+{
+  int old_size = GetSize();
+
+  if (size == old_size) {
+    return;
+  }
+
+  if (size < old_size) {
+    // If the new size is less, delete all extraneous parameters
+    for (int i=size;i<sub_params_.size();i++) {
+      delete sub_params_.at(i);
+    }
+  }
+
+  sub_params_.resize(size);
+
+  if (size > old_size) {
+    // If the new size is greater, create valid parameters for each slot
+    for (int i=old_size;i<size;i++) {
+      QString sub_id = id();
+      sub_id.append(QString::number(i));
+
+      Q_ASSERT(!parentNode()->HasParamWithID(sub_id));
+
+      NodeInput* new_param = new NodeInput(sub_id);
+      new_param->setParent(this);
+      sub_params_.replace(i, new_param);
+
+      connect(new_param, SIGNAL(ValueChanged(rational, rational)), this, SIGNAL(ValueChanged(rational, rational)));
+      connect(new_param, SIGNAL(EdgeAdded(NodeEdgePtr)), this, SIGNAL(EdgeAdded(NodeEdgePtr)));
+      connect(new_param, SIGNAL(EdgeRemoved(NodeEdgePtr)), this, SIGNAL(EdgeRemoved(NodeEdgePtr)));
+    }
+  }
+}
+
+NodeInput *NodeInputArray::ParamAt(int index)
+{
+  return sub_params_.at(index);
+}

app/node/inputarray.h

@@ -1,11 +1,21 @@
 #ifndef INPUTARRAY_H
 #define INPUTARRAY_H
 
+#include "input.h"
 
-class InputArray
+class NodeInputArray : public NodeInput
 {
 public:
-  InputArray();
+  NodeInputArray(const QString &id);
+
+  int GetSize() const;
+  void SetSize(int size);
+
+  NodeInput* ParamAt(int index);
+
+private:
+  QVector<NodeInput*> sub_params_;
+
 };
 
 #endif // INPUTARRAY_H

app/node/node.h

@@ -28,6 +28,7 @@
 #include "common/rational.h"
 #include "node/dependency.h"
 #include "node/input.h"
+#include "node/inputarray.h"
 #include "node/output.h"
 
 /**
@@ -254,6 +255,11 @@ public:
    */
   virtual QVariant Value(NodeOutput* output);
 
+  /**
+   * @brief Return whether a parameter with ID `id` has already been added to this Node
+   */
+  bool HasParamWithID(const QString& id);
+
 protected:
   /**
    * @brief Add a parameter to this node
@@ -309,11 +315,6 @@ signals:
   void EdgeRemoved(NodeEdgePtr edge);
 
 private:
-  /**
-   * @brief Return whether a parameter with ID `id` has already been added to this Node
-   */
-  bool HasParamWithID(const QString& id);
-
   bool HasParamOfType(NodeParam::Type type, bool must_be_connected);
 
   QList<NodeParam *> params_;