--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Widgets/WidgetBase.h	Fri Oct 14 15:34:11 2016 +0200
@@ -0,0 +1,122 @@
+/**
+ * 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 "IWidget.h"
+
+#include "../Viewport/CairoContext.h"
+#include "../Toolbox/ObserversRegistry.h"
+
+#include <boost/thread.hpp>
+
+namespace OrthancStone
+{
+  class WidgetBase : public IWidget
+  {
+  private:
+    IStatusBar*                  statusBar_;
+    ObserversRegistry<IWidget>   observers_;
+    bool                         started_;
+    boost::thread                thread_;
+    bool                         backgroundCleared_;
+    uint8_t                      backgroundColor_[3];
+
+  protected:
+    void ClearBackgroundOrthanc(Orthanc::ImageAccessor& target) const;
+
+    void ClearBackgroundCairo(CairoContext& context) const;
+
+    void ClearBackgroundCairo(Orthanc::ImageAccessor& target) const;
+
+    void NotifyChange();
+
+    void UpdateStatusBar(const std::string& message);
+
+    static void WorkerThread(WidgetBase* that);
+
+    IStatusBar* GetStatusBar() const
+    {
+      return statusBar_;
+    }
+
+    virtual bool HasUpdateThread() const = 0;
+
+    virtual void UpdateStep() = 0;
+
+  public:
+    WidgetBase();
+
+    bool IsStarted() const
+    {
+      return started_;
+    }
+
+    void SetBackgroundCleared(bool clear)
+    {
+      backgroundCleared_ = clear;
+    }
+
+    bool IsBackgroundCleared() const
+    {
+      return backgroundCleared_;
+    }
+
+    void SetBackgroundColor(uint8_t red,
+                            uint8_t green,
+                            uint8_t blue);
+
+    void GetBackgroundColor(uint8_t& red,
+                            uint8_t& green,
+                            uint8_t& blue) const;
+
+    virtual void Register(IChangeObserver& observer);
+
+    virtual void Unregister(IChangeObserver& observer);
+    
+    virtual void SetStatusBar(IStatusBar& statusBar)
+    {
+      statusBar_ = &statusBar;
+    }
+
+    virtual void ResetStatusBar()
+    {
+      statusBar_ = NULL;
+    }    
+
+    virtual void Start();
+
+    virtual void Stop();
+
+    virtual bool Render(Orthanc::ImageAccessor& surface);
+  };
+}