Integrate undo infrastructure with SoundMacroEditor

Editor/EditorWidget.hpp

@@ -2,15 +2,33 @@
 #define AMUSE_EDITOR_WIDGET_HPP
 
 #include <QWidget>
+#include <QUndoCommand>
+#include <QApplication>
 #include "ProjectModel.hpp"
 
 class EditorWidget : public QWidget
 {
-Q_OBJECT
+    Q_OBJECT
 public:
     explicit EditorWidget(QWidget* parent = Q_NULLPTR);
     virtual bool valid() const { return true; }
+    virtual void unloadData() {}
 };
 
+class EditorUndoCommand : public QUndoCommand
+{
+protected:
+    std::shared_ptr<ProjectModel::INode> m_node;
+    enum class Id
+    {
+        SMChangeVal,
+    };
+public:
+    EditorUndoCommand(std::shared_ptr<ProjectModel::INode> node,
+                      const QString& text, QUndoCommand* parent = nullptr)
+    : QUndoCommand(text, parent), m_node(node) {}
+    void undo();
+    void redo();
+};
 
 #endif //AMUSE_EDITOR_WIDGET_HPP