[提问]点击左键没反应，中建和右键才有这个事件呢？QEvent::MouseButtonPress [复制链接]

bool MainWindow::eventFilter(QObject *watched, QEvent *event)[pre]{[/pre][pre]    if(watched == ui->graphicsView)[/pre][pre]    {[/pre][pre]        if(event->type() == QEvent::MouseButtonPress)[/pre][pre]        {[/pre][pre]            QMouseEvent *mouseevent = (QMouseEvent *)event;[/pre][pre]            if(mouseevent->buttons() &Qt::LeftButton)[/pre][pre]            {[/pre][pre]                QMessageBox::information(this,"hello","world");[/pre][pre]            }[/pre][pre]            if(mouseevent->buttons() &Qt::RightButton)[/pre][pre]            {[/pre][pre]                ui->graphicsView->scale(2,2);[/pre][pre]            }[/pre][pre]            if(mouseevent->buttons() &Qt::MidButton)[/pre][pre]            {[/pre][pre]                ui->graphicsView->scale(0.5,0.5);[/pre][pre]            }[/pre][pre]            return true;[/pre][pre]        }[/pre][pre]    }[/pre][pre]    return false;[/pre][pre]}[/pre]

注：什么setMouseTracking(true)设置了也没起效...

click（）是左键点击信号，

楼上的，无论是左键 ，中键还是 右键 点击鼠标都应该触发QEvent::MouseButtonPress 的