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);

}

}