--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Applications/Samples/SimpleViewer/MainWidgetInteractor.cpp	Thu Oct 11 13:16:54 2018 +0200
@@ -0,0 +1,106 @@
+/**
+ * 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/>.
+ **/
+
+#include "MainWidgetInteractor.h"
+
+#include "SimpleViewerApplication.h"
+
+namespace SimpleViewer {
+
+  IWorldSceneMouseTracker* MainWidgetInteractor::CreateMouseTracker(WorldSceneWidget& widget,
+                                                                    const ViewportGeometry& view,
+                                                                    MouseButton button,
+                                                                    KeyboardModifiers modifiers,
+                                                                    double x,
+                                                                    double y,
+                                                                    IStatusBar* statusBar)
+  {
+    if (button == MouseButton_Left)
+    {
+      if (application_.GetCurrentTool() == SimpleViewerApplication::Tools_LineMeasure)
+      {
+        return new LineMeasureTracker(statusBar, dynamic_cast<LayerWidget&>(widget).GetSlice(), x, y, 255, 0, 0, 10);
+      }
+      else if (application_.GetCurrentTool() == SimpleViewerApplication::Tools_CircleMeasure)
+      {
+        return new CircleMeasureTracker(statusBar, dynamic_cast<LayerWidget&>(widget).GetSlice(), x, y, 255, 0, 0, 10);
+      }
+      else if (application_.GetCurrentTool() == SimpleViewerApplication::Tools_Crop)
+      {
+        // TODO
+      }
+      else if (application_.GetCurrentTool() == SimpleViewerApplication::Tools_Windowing)
+      {
+        // TODO
+      }
+      else if (application_.GetCurrentTool() == SimpleViewerApplication::Tools_Zoom)
+      {
+        // TODO
+      }
+      else if (application_.GetCurrentTool() == SimpleViewerApplication::Tools_Pan)
+      {
+        // TODO
+      }
+
+    }
+    return NULL;
+  }
+
+  void MainWidgetInteractor::MouseOver(CairoContext& context,
+                                       WorldSceneWidget& widget,
+                                       const ViewportGeometry& view,
+                                       double x,
+                                       double y,
+                                       IStatusBar* statusBar)
+  {
+    if (statusBar != NULL)
+    {
+      Vector p = dynamic_cast<LayerWidget&>(widget).GetSlice().MapSliceToWorldCoordinates(x, y);
+
+      char buf[64];
+      sprintf(buf, "X = %.02f Y = %.02f Z = %.02f (in cm)",
+              p[0] / 10.0, p[1] / 10.0, p[2] / 10.0);
+      statusBar->SetMessage(buf);
+    }
+  }
+
+  void MainWidgetInteractor::MouseWheel(WorldSceneWidget& widget,
+                                        MouseWheelDirection direction,
+                                        KeyboardModifiers modifiers,
+                                        IStatusBar* statusBar)
+  {
+  }
+
+  void MainWidgetInteractor::KeyPressed(WorldSceneWidget& widget,
+                                        char key,
+                                        KeyboardModifiers modifiers,
+                                        IStatusBar* statusBar)
+  {
+    switch (key)
+    {
+    case 's':
+      widget.SetDefaultView();
+      break;
+
+    default:
+      break;
+    }
+  }
+}