--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Scene2DViewport/ViewportController.h	Wed May 15 16:56:17 2019 +0200
@@ -0,0 +1,75 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2019 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+#pragma once
+
+#include "PointerTypes.h"
+
+#include <Framework/Scene2D/Scene2D.h>
+#include <Framework/Scene2D/PointerEvent.h>
+#include <Framework/Scene2DViewport/MeasureTools.h>
+#include <Framework/Scene2DViewport/IFlexiblePointerTracker.h>
+
+namespace OrthancStone
+{
+  /**
+  This object is responsible for hosting a scene, responding to messages from
+  the model and updating the scene accordingly.
+
+  It contains the list of active measuring tools as well as the stack
+  where measuring tool commands are stored.
+
+  The active tracker is also stored in the viewport controller.
+
+  Each canvas or other GUI area where we want to display a 2D image, either 
+  directly or through slicing must be assigned a ViewportController.
+  */
+  class ViewportController : public boost::noncopyable
+  {
+  public:
+    ViewportController(MessageBroker& broker);
+
+    Scene2DPtr GetScene();
+
+    /** 
+    This method is called by the GUI system and should update/delete the
+    current tracker
+    */
+    bool HandlePointerEvent(PointerEvent e);
+
+    /**
+    This method returns the list of measure tools containing the supplied point
+    (in scene coords). A tracker can then be requested from the chosen 
+    measure tool, if needed
+    */
+    std::vector<MeasureToolPtr> HitTestMeasureTools(ScenePoint2D p);
+
+    /**
+    With this method, the object takes ownership of the supplied tracker and
+    updates it according to user interaction
+    */
+    void SetActiveTracker(FlexiblePointerTrackerPtr tracker);
+
+  private:
+    MessageBroker&            broker_;
+    Scene2DWPtr               scene_;
+    FlexiblePointerTrackerPtr tracker_;
+  };
+}