diff --git a/src/schedulable_state_widget.cc b/src/schedulable_state_widget.cc
new file mode 100644
index 0000000..7daf8ca
--- /dev/null
+++ b/src/schedulable_state_widget.cc
@@ -0,0 +1,95 @@
+// src/schedulable_state_widget.cc - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This 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 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 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 SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#include "schedulable_state_widget.hh"
+
+using namespace sgpem;
+
+
+Gtk::Tooltips 
+SchedulableStateWidget::_ttips;
+
+
+SchedulableStateWidget::SchedulableStateWidget(Schedulable::state st)
+  : _color(1, 1, 1)
+{
+  set_scaling_mode(scaling_to_w);
+  set_state(st);
+}
+
+
+void 
+SchedulableStateWidget::set_state(Schedulable::state new_state)
+{
+  switch(new_state)
+    {
+    case Schedulable::state_future:
+      _color = Color(1, 1, 1); // White
+      _ttips.set_tip(*this, "Future");
+      break;
+    case Schedulable::state_ready:
+      _color = Color(1, 1, 0); // Yellow
+      _ttips.set_tip(*this, "Ready");
+      break;
+    case Schedulable::state_running:
+      _color = Color(0, 1, 0); // Green
+      _ttips.set_tip(*this, "Running");
+      break;
+    case Schedulable::state_blocked:
+      _color = Color(0, 0, 1); // Blue
+      _ttips.set_tip(*this, "Blocked");
+      break;
+    case Schedulable::state_terminated:
+      _color = Color(0, 0, 0); // Black
+      _ttips.set_tip(*this, "Terminated");
+      break;
+    }
+
+  queue_draw();
+}
+
+void 
+SchedulableStateWidget::draw_widget(cairo_t* ctx)
+{
+  CairoElements ce(ctx);
+  static const Point center(.5f, .5f);
+  ce.draw_3dsphere(center, .49f, _color);
+}
+
+
+void 
+SchedulableStateWidget::calc_drawing_size(size_t& width, size_t& height) const
+{
+  width  = 1;
+  height = 1;
+}
+
+
+void 
+SchedulableStateWidget::calc_widget_size(size_t& width, size_t& height) const
+{
+  static const size_t min_size = 15; // px
+
+  if(width != height)
+    if(width < min_size || height < min_size)
+      width = height = min_size;
+    else
+      width = height = std::min(width, height);
+}
diff --git a/src/schedulable_state_widget.hh b/src/schedulable_state_widget.hh
new file mode 100644
index 0000000..672c34d
--- /dev/null
+++ b/src/schedulable_state_widget.hh
@@ -0,0 +1,58 @@
+// src/schedulable_state_widget.hh - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This 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 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 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 SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#ifndef SCHEDULABLE_STATE_WIDGET_HH
+#define SCHEDULABLE_STATE_WIDGET_HH 1
+
+#include "config.h"
+
+#include "backend/schedulable.hh"
+#include "cairo_elements.hh"
+#include "cairo_widget.hh"
+
+#include "gtkmm/tooltips.h"
+
+namespace sgpem
+{
+  class SchedulableStateWidget : public CairoWidget
+  {
+  public:
+    SchedulableStateWidget(Schedulable::state st);
+
+    void set_state(Schedulable::state new_state);
+
+  protected:
+    virtual void draw_widget(cairo_t* ctx) = 0;
+
+    // with this method CairoWidget tells the needed drawing dimensions
+    virtual void calc_drawing_size(size_t& width, size_t& height) const;
+
+    // with this method CairoWidget tells the needed widget dimensions
+    virtual void calc_widget_size(size_t& width, size_t& height) const;
+
+  private:
+           Color         _color;
+    static Gtk::Tooltips _ttips;
+  };
+
+} //~ namespace sgpem
+
+
+#endif //~ SCHEDULABLE_STATE_WIDGET_HH