QT事件介绍

QT事件

事件index.php/tags-41973.html" >���发—事件过滤器—事件分发—事件处理阶段

1、窗口关闭二次确认

2、窗口调整大小

widget.h

protected:    void closeEvent(QCloseEvent *event);    void resizeEvent(QResizeEvent *event);

widget.cpp

#include #include #include #include void Widget::closeEvent(QCloseEvent *event){    int ret = QMessageBox::question(this,"提示", "您确定要关闭窗口吗？");    if (ret == QMessageBox::Yes)    {        event->accept();    }    else {        event->ignore();    }}void Widget::resizeEvent(QResizeEvent *event){    qDebug()    Q_OBJECTpublic:    explicit MyLabel(QWidget *parent = 0);signals:public slots:protected:    void mousePressEvent(QMouseEvent *ev);    void mouseReleaseEvent(QMouseEvent *ev);    void mouseMoveEvent(QMouseEvent *ev);};#endif // MYLABEL_H    this-setMouseTracking(true);  // 设置为true后，不需要按下鼠标即可追踪鼠标了}void MyLabel::mousePressEvent(QMouseEvent *ev){    // qDebug()        qDebug()        qDebug()        qDebug()    qDebug()    // qDebug()    // 判断事件类型（键盘事件）    if(event-type() == QEvent::KeyPress){        // 将QEvent类型的event转换类型为QKeyEvent        QKeyEvent *keyEvent = static_cast            qDebug()