diff --git a/src/controls/QskAnimationHint.cpp b/src/controls/QskAnimationHint.cpp
new file mode 100644
index 00000000..259b1936
--- /dev/null
+++ b/src/controls/QskAnimationHint.cpp
@@ -0,0 +1,24 @@
+/******************************************************************************
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
+ *****************************************************************************/
+
+#include "QskAnimationHint.h"
+
+#ifndef QT_NO_DEBUG_STREAM
+
+#include <qdebug.h>
+
+QDebug operator<<( QDebug debug, const QskAnimationHint& hint )
+{
+    QDebugStateSaver saver( debug );
+    debug.nospace();
+
+    debug << "AnimationHint" << '(';
+    debug << hint.duration << ',' << hint.type << ',' << hint.updateFlags;
+    debug << ')';
+
+    return debug;
+}
+
+#endif
diff --git a/src/controls/QskAnimationHint.h b/src/controls/QskAnimationHint.h
index 4a1f04a7..7687b102 100644
--- a/src/controls/QskAnimationHint.h
+++ b/src/controls/QskAnimationHint.h
@@ -42,6 +42,11 @@ class QSK_EXPORT QskAnimationHint
     {
     }
 
+    inline constexpr bool isValid() const
+    {
+        return duration > 0;
+    }
+
     uint duration;
     QEasingCurve::Type type;
     UpdateFlags updateFlags;
@@ -51,4 +56,11 @@ Q_DECLARE_METATYPE( QskAnimationHint )
 Q_DECLARE_TYPEINFO( QskAnimationHint, Q_PRIMITIVE_TYPE );
 Q_DECLARE_OPERATORS_FOR_FLAGS( QskAnimationHint::UpdateFlags )
 
+#ifndef QT_NO_DEBUG_STREAM
+
+class QDebug;
+QSK_EXPORT QDebug operator<<( QDebug, const QskAnimationHint& );
+
+#endif
+
 #endif
diff --git a/src/src.pro b/src/src.pro
index f2db71f7..3ed81c02 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -212,6 +212,7 @@ HEADERS += \
 SOURCES += \
     controls/QskAbstractButton.cpp \
     controls/QskAnimator.cpp \
+    controls/QskAnimationHint.cpp \
     controls/QskBoundedControl.cpp \
     controls/QskBoundedInput.cpp \
     controls/QskBoundedRangeInput.cpp \