--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Radiography/RadiographyWindowingTracker.h	Tue Nov 13 10:36:53 2018 +0100
@@ -0,0 +1,87 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2018 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 "../Toolbox/UndoRedoStack.h"
+#include "../Widgets/IWorldSceneMouseTracker.h"
+#include "RadiographyScene.h"
+
+namespace OrthancStone
+{
+  class RadiographyWindowingTracker : public IWorldSceneMouseTracker
+  {   
+  public:
+    enum Action
+    {
+      Action_IncreaseWidth,
+      Action_DecreaseWidth,
+      Action_IncreaseCenter,
+      Action_DecreaseCenter
+    };
+    
+  private:
+    class UndoRedoCommand;
+
+    UndoRedoStack&      undoRedoStack_;
+    RadiographyScene&   scene_;
+    int                 clickX_;
+    int                 clickY_;
+    Action              leftAction_;
+    Action              rightAction_;
+    Action              upAction_;
+    Action              downAction_;
+    float               strength_;
+    float               sourceCenter_;
+    float               sourceWidth_;
+
+    static void ComputeAxisEffect(int& deltaCenter,
+                                  int& deltaWidth,
+                                  int delta,
+                                  Action actionNegative,
+                                  Action actionPositive);    
+    
+  public:
+    RadiographyWindowingTracker(UndoRedoStack& undoRedoStack,
+                                RadiographyScene& scene,
+                                int x,
+                                int y,
+                                Action leftAction,
+                                Action rightAction,
+                                Action upAction,
+                                Action downAction);
+    
+    virtual bool HasRender() const
+    {
+      return false;
+    }
+
+    virtual void Render(CairoContext& context,
+                        double zoom);
+
+    virtual void MouseUp();
+
+    virtual void MouseMove(int displayX,
+                           int displayY,
+                           double sceneX,
+                           double sceneY);
+  };
+}