VP1TabBar Node1 VP1TabBar + VP1TabBar() + ~VP1TabBar() + setTabReorderingEnabled() + isTabReorderingEnabled() + setTabCloseActivatePrevious() + tabCloseActivatePrevious() + selectTab() # mouseDoubleClickEvent() # mousePressEvent() # mouseMoveEvent() # mouseReleaseEvent() # wheelEvent() # dragEnterEvent() # dragMoveEvent() # dropEvent() # tabLayoutChange() # activateDragSwitchTab() Node2 QTabBar Node2->Node1 Node3 VP1TabBar::Private + mDragStart + mReorderStartTab + mReorderPreviousTab + mDragSwitchTab + mActivateDragSwitchTabTimer + mTabReorderingEnabled + mTabCloseActivatePrevious + Private() Node3->Node1 -m_d