事件-eventQEventQPaintEventQMouseEventQKeyEventQWheelEventeventFilter 事件-event 事件循环事件分发事件队列事件响应 QEvent QPaintEvent QMouseEventbutton() buttons();位置函数鼠标跟踪 QKeyEventkey(); 需要设置鼠标 QWheelEventangleDelta xy eventFilter https://blog.csdn.net/xj178926426/article/details/7188246窗口状态