Add support for "windowbuttonmotionfcn" and "currentpoint" * Figure.cc (Figure::Figure): Enable mouse tracking if windowbuttonmotionfcn callback is defined. (Figure::update): Enable mouse tracking on canvas and all child widgets when windowbuttonmotionfcn is defined. * Panel.cc (Panel::Panel): Propagate mouse tracking to child widgets during initialization. * Container.h (Container::childEvent): New method. * Container.cc (Container::childEvent): Likewise. Propagate mouse tracking status to child widgets. * BaseControl.cc (BaseControl::eventFilter): Handle mouse move events and call figure's appropriate callback. * Canvas.h (Canvas::updateCurrentPoint): New method. * Canvas.cc (Canvas::updateCurrentPoint): Likewise. Update figure and child axes currentpoint property. (Canvas::canvasMouseMoveEvent): Update currentpoint properties and call windowbuttonmotionfcn callback. (Canvas::canvasMousePressEvent): Call updateCurrentPoint. (Canvas::canvasMouseReleaseEvent): Likewise.

--- a/libgui/graphics/BaseControl.cc	Sun Mar 30 14:18:43 2014 -0700
+++ b/libgui/graphics/BaseControl.cc	Tue Apr 01 20:57:08 2014 -0400
@@ -195,6 +195,20 @@
 	    }
 	}
       break;
+    case QEvent::MouseMove:
+      if (qWidget<QWidget> ()->hasMouseTracking ())
+        {
+	  gh_manager::auto_lock lock;
+
+	  QMouseEvent* m = dynamic_cast<QMouseEvent*> (event);
+	  graphics_object go = object ();
+	  graphics_object fig = go.get_ancestor ("figure");
+
+          gh_manager::post_set (fig.get_handle (), "currentpoint",
+                                Utils::figureCurrentPoint (fig, m), false);
+          gh_manager::post_callback (fig.get_handle (), "windowbuttonmotionfcn");
+        }
+      break;
     case QEvent::KeyPress:
       if (m_keyPressHandlerDefined)
         {