connect(m_scene, SIGNAL(addKeyframe()), this, SLOT(slotInsertKeyframe()));
connect(keyframe_list, SIGNAL(cellChanged(int, int)), this, SLOT(slotUpdateItem()));
connect(m_scene, SIGNAL(addKeyframe()), this, SLOT(slotInsertKeyframe()));
connect(keyframe_list, SIGNAL(cellChanged(int, int)), this, SLOT(slotUpdateItem()));