Add ClearSurfaceCmd command

src/Commands/ClearSurfacesCmd.cpp

@@ -0,0 +1,23 @@
+#include "ClearSurfacesCmd.h"
+
+namespace ofx {
+namespace piMapper {
+
+ClearSurfacesCmd::ClearSurfacesCmd(){
+	_surfaces = SurfaceStack::instance()->getSurfaces();
+}
+
+void ClearSurfacesCmd::exec(){
+	SurfaceStack::instance()->clear();
+}
+
+void ClearSurfacesCmd::undo(){
+	ofLogNotice("ClearSurfacesCmd", "undo");
+	for(unsigned int i = 0; i < _surfaces.size(); ++i){
+		SurfaceStack::instance()->push_back(_surfaces[i]);
+	}
+}
+
+} // namespace piMapper
+} // namespace ofx
+

src/Commands/ClearSurfacesCmd.h

@@ -0,0 +1,30 @@
+// SelSurfaceCmd
+// Provides with option to undo select surface operation.
+// Created by Krisjanis Rijnieks 2015-05-14
+
+#pragma once
+
+#include "BaseCmd.h"
+#include "BaseSurface.h"
+#include "SurfaceStack.h"
+#include "Gui.h"
+
+namespace ofx {
+namespace piMapper {
+
+class ClearSurfacesCmd : public BaseUndoCmd {
+
+	public:
+		ClearSurfacesCmd();
+		void exec();
+		void undo();
+
+	private:
+		// Here it would make sense to have another instance of SurfaceStack
+		vector<BaseSurface *> _surfaces;
+
+};
+
+} // namespace piMapper
+} // namespace ofx
+