--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Widgets/LayerWidget.h	Wed May 17 22:03:09 2017 +0200
@@ -0,0 +1,98 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017 Osimis, 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 "WorldSceneWidget.h"
+#include "../Layers/ILayerSource.h"
+
+#include <map>
+
+namespace OrthancStone
+{
+  class LayerWidget :
+    public WorldSceneWidget,
+    public ILayerSource::IObserver   // TODO move this as PImpl
+  {
+  private:
+    class Scene;
+    
+    typedef std::map<ILayerSource*, size_t>  LayersIndex;
+
+    bool                        started_;
+    LayersIndex                 layersIndex_;
+    std::vector<ILayerSource*>  layers_;
+    std::vector<RenderStyle>    styles_;
+    SliceGeometry               slice_;
+    double                      sliceThickness_;
+    std::auto_ptr<Scene>        currentScene_;
+    std::auto_ptr<Scene>        pendingScene_;
+
+
+    bool LookupLayer(size_t& index /* out */,
+                     ILayerSource& layer) const;
+    
+        
+  protected:
+    virtual void GetSceneExtent(double& x1,
+                                double& y1,
+                                double& x2,
+                                double& y2);
+ 
+    virtual bool RenderScene(CairoContext& context,
+                             const ViewportGeometry& view);
+
+    void ResetPendingScene();
+
+    void UpdateLayer(size_t index,
+                     ILayerRenderer* renderer,
+                     const SliceGeometry& slice);
+    
+  public:
+    LayerWidget();
+
+    virtual ~LayerWidget();
+
+    size_t AddLayer(ILayerSource* layer);  // Takes ownership
+
+    void SetLayerStyle(size_t layer,
+                       const RenderStyle& style);
+
+    void SetSlice(const SliceGeometry& slice,
+                  double sliceThickness);
+
+    virtual void NotifyGeometryReady(ILayerSource& source);
+
+    virtual void NotifySourceChange(ILayerSource& source);
+
+    virtual void NotifySliceChange(ILayerSource& source,
+                                   const SliceGeometry& slice);
+
+    virtual void NotifyLayerReady(ILayerRenderer* renderer,
+                                  ILayerSource& source,
+                                  const SliceGeometry& viewportSlice);
+
+    virtual void NotifyLayerError(ILayerSource& source,
+                                  const SliceGeometry& viewportSlice);
+
+    virtual void Start();
+  };
+}