--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Platforms/Wasm/Defaults.h	Tue Jun 19 16:06:32 2018 +0200
@@ -0,0 +1,74 @@
+#pragma once
+
+#include <emscripten/emscripten.h>
+
+#include <Framework/dev.h>
+#include <Framework/Viewport/WidgetViewport.h>
+#include <Framework/Widgets/LayerWidget.h>
+#include <Framework/Widgets/LayoutWidget.h>
+#include <Applications/Wasm/BasicWasmApplication.h>
+#include <Applications/Wasm/BasicWasmApplicationContext.h>
+
+typedef OrthancStone::WidgetViewport* ViewportHandle; // the objects exchanged between JS and C++
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  
+  // JS methods accessible from C++
+  extern void ScheduleWebViewportRedrawFromCpp(ViewportHandle cppViewportHandle);
+  
+  // C++ methods accessible from JS
+  extern void EMSCRIPTEN_KEEPALIVE CreateWasmApplication(ViewportHandle cppViewportHandle);
+
+#ifdef __cplusplus
+}
+#endif
+
+extern OrthancStone::BasicWasmApplication* CreateUserApplication();
+
+namespace OrthancStone {
+
+  // default Ovserver to trigger Viewport redraw when something changes in the Viewport
+  class ChangeObserver :
+    public OrthancStone::IViewport::IObserver
+  {
+  private:
+    // Flag to avoid flooding JavaScript with redundant Redraw requests
+    bool isScheduled_; 
+
+  public:
+    ChangeObserver() :
+      isScheduled_(false)
+    {
+    }
+
+    void Reset()
+    {
+      isScheduled_ = false;
+    }
+
+    virtual void NotifyChange(const OrthancStone::IViewport &viewport)
+    {
+      if (!isScheduled_)
+      {
+        ScheduleWebViewportRedrawFromCpp((ViewportHandle)&viewport);  // loosing constness when transmitted to Web
+        isScheduled_ = true;
+      }
+    }
+  };
+
+  // default status bar to log messages on the console/stdout
+  class StatusBar : public OrthancStone::IStatusBar
+  {
+  public:
+    virtual void ClearMessage()
+    {
+    }
+
+    virtual void SetMessage(const std::string& message)
+    {
+      printf("%s\n", message.c_str());
+    }
+  };
+}
\ No newline at end of file