--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Widgets/LayeredSceneWidget.h	Fri Oct 14 15:34:11 2016 +0200
@@ -0,0 +1,135 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "WorldSceneWidget.h"
+
+#include "../Layers/ILayerRendererFactory.h"
+
+
+namespace OrthancStone
+{
+  class LayeredSceneWidget : public WorldSceneWidget
+  {
+  public:
+    // Must be thread-safe
+    class ISliceObserver : public boost::noncopyable
+    {
+    public:
+      virtual ~ISliceObserver()
+      {
+      }
+
+      virtual void NotifySliceChange(const LayeredSceneWidget& source,
+                                     const SliceGeometry& slice) = 0;
+    };
+
+  private:
+    struct SliceChangeFunctor;
+    class Renderers;
+    class PendingLayers;
+    class Layer;
+
+    typedef ObserversRegistry<LayeredSceneWidget, ISliceObserver>  Observers;
+
+    std::vector<Layer*>           layers_;
+    std::auto_ptr<Renderers>      renderers_;
+    std::auto_ptr<PendingLayers>  pendingLayers_;
+    std::auto_ptr<Renderers>      pendingRenderers_;
+    boost::mutex                  sliceMutex_;
+    SliceGeometry                 slice_;
+    Observers                     observers_;
+
+  protected:
+    virtual bool HasUpdateThread() const
+    {
+      return true;
+    }
+
+    virtual void UpdateStep();
+
+    virtual bool RenderScene(CairoContext& context,
+                             const ViewportGeometry& view);
+
+  public:
+    LayeredSceneWidget();
+
+    virtual ~LayeredSceneWidget();
+
+    virtual SliceGeometry GetSlice();
+
+    virtual void GetSceneExtent(double& x1,
+                                double& y1,
+                                double& x2,
+                                double& y2);
+
+    ILayerRendererFactory& AddLayer(size_t& layerIndex,
+                                    ILayerRendererFactory* factory);   // Takes ownership
+
+    // Simpler version for basic use cases
+    void AddLayer(ILayerRendererFactory* factory);   // Takes ownership
+
+    size_t GetLayerCount() const
+    {
+      return layers_.size();
+    }
+
+    RenderStyle GetLayerStyle(size_t layer);
+    
+    void SetLayerStyle(size_t layer,
+                       const RenderStyle& style);
+
+    void SetSlice(const SliceGeometry& slice);
+
+    void InvalidateLayer(unsigned int layer);
+
+    void InvalidateAllLayers();
+
+    virtual void Start();
+
+    virtual void Stop();
+
+    using WorldSceneWidget::Register;
+    using WorldSceneWidget::Unregister;
+
+    void Register(ISliceObserver& observer)
+    {
+      observers_.Register(observer);
+    }
+
+    void Unregister(ISliceObserver& observer)
+    {
+      observers_.Unregister(observer);
+    }
+  };
+}