QT 实现按住鼠标左键点击对话框空白处，拖动对话框

定义头文件

QPoint move_point; //移动的距离

    bool mouse_press; //按下鼠标左键

protected:

    void mousePressEvent(QMouseEvent *event);

    void mouseReleaseEvent(QMouseEvent *event);

    void mouseMoveEvent(QMouseEvent *event);

复写实现函数：

void Dialog::mousePressEvent( QMouseEvent * event )

{

    //只能是鼠标左键移动和改变大小

    if(event->button() == Qt::LeftButton)

    {

        mouse_press = true;

    }

//窗口移动距离

    move_point = event->globalPos() - this->pos();

    qDebug() << "pos()" << this->pos().x() << " " << this->pos().y() ;

    qDebug() << "globalPos()" << event->globalPos().x() << " " << event->globalPos().y() ;

}

void Dialog::mouseReleaseEvent(QMouseEvent *)

{

    mouse_press = false;

}

void Dialog::mouseMoveEvent(QMouseEvent *event)

{

    //移动窗口

    if(mouse_press)

    {

        QPoint move_pos = event->globalPos();

        move(move_pos - move_point);

    }

}