（31）Qt里事件类的继承关系，以及 QObject、QWdget里的事件成员函数定义。-优快云博客

本文链接：https://blog.youkuaiyun.com/zhangzhangkeji/article/details/149294326

（1）

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（2）

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++给出代码版 ：

class Q_CORE_EXPORT QObject //QObject里关于事件的支持
{
    Q_OBJECT

public:
    Q_INVOKABLE explicit QObject(QObject * parent = nullptr);

    virtual ~QObject();

    virtual bool       event      (                   QEvent * event);
    virtual bool       eventFilter(QObject * watched, QEvent * event);

    void        installEventFilter(QObject * filterObj);
    void         removeEventFilter(QObject * obj);

protected:

    virtual void  timerEvent(QTimerEvent * event);
    virtual void  childEvent(QChildEvent * event);
    virtual void customEvent(QEvent      * event);

}; //结束 class QObject 的定义

（3）

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class Q_WIDGETS_EXPORT QWidget : public QObject, public QPaintDevice
{ protected:  // Event handlers
    bool                         event(QEvent            * event) override;
    virtual void       mousePressEvent(QMouseEvent       * event);
    virtual void     mouseReleaseEvent(QMouseEvent       * event);
    virtual void mouseDoubleClickEvent(QMouseEvent       * event);
    virtual void        mouseMoveEvent(QMouseEvent       * event);
    virtual void            wheelEvent(QWheelEvent       * event);
    virtual void         keyPressEvent(QKeyEvent         * event);
    virtual void       keyReleaseEvent(QKeyEvent         * event);
    virtual void          focusInEvent(QFocusEvent       * event);
    virtual void         focusOutEvent(QFocusEvent       * event);
    virtual void            enterEvent(QEnterEvent       * event);
    virtual void            leaveEvent(QEvent            * event);
    virtual void            paintEvent(QPaintEvent       * event);
    virtual void             moveEvent(QMoveEvent        * event);
    virtual void           resizeEvent(QResizeEvent      * event);
    virtual void            closeEvent(QCloseEvent       * event);
    virtual void      contextMenuEvent(QContextMenuEvent * event);
    virtual void           tabletEvent(QTabletEvent      * event);
    virtual void           actionEvent(QActionEvent      * event);
    virtual void        dragEnterEvent(QDragEnterEvent   * event);
    virtual void         dragMoveEvent(QDragMoveEvent    * event);
    virtual void        dragLeaveEvent(QDragLeaveEvent   * event);
    virtual void             dropEvent(QDropEvent        * event);
    virtual void             showEvent(QShowEvent        * event);
    virtual void             hideEvent(QHideEvent        * event);
    virtual void           changeEvent(QEvent            *      );
    virtual bool           nativeEvent(const QByteArray & eventType, void * message,
                                        qintptr * result);
    virtual void      inputMethodEvent(QInputMethodEvent *      );
}; //完结 class QWidget : public QObject, public QPaintDevice