Qt拖拽功能

合集 - QT(1)

1.Qt拖拽功能2023-05-29

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Qt拖拽功能

窗口拖拽文件读取文件路径+文件名

void MainWindow::dragEnterEvent(QDragEnterEvent *ev)
{
    if(ev->mimeData()->hasUrls())
    {
        ev->accept();//接收拖动进入事件
    }
    //ev->ignore();//若忽略该事件，则不会发生之后的事件，拖放到此结束
}

void MainWindow::dropEvent(QDropEvent *ev)
{
    QList<QUrl> urls = ev->mimeData()->urls();
    ui->lineEdit_source->setText(urls[0].toLocalFile());
    ui->lineEdit_target->setText(urls[0].toLocalFile());
    //if(ev->mimeData()->hasUrls())
    //{
        //QList<QUrl> urls = ev->mimeData()->urls();
       // ui->lineEdit_source->text() = urls.at(0).toLocalFile();
       // ui->lineEdit_target->text() = urls.at(1).toLocalFile();
        //for(int i=0; i<urls.size(); i++)
        //{

        //}

    //}
}

调试过程信号槽函数

ui->label->setAcceptDrops(true);

拖拽到指定控件获得路径+文件名

https://www.pianshen.com/article/872738975/

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

//drag file
    ui->pushButton->installEventFilter(this);
    ui->pushButton->setAcceptDrops(true);
    ui->pushButton_2->installEventFilter(this);
    ui->pushButton_2->setAcceptDrops(true);

bool MainWindow::eventFilter(QObject *watched, QEvent *event)
{
    if (watched == ui->pushButton)
    {
        if (event->type() == QEvent::DragEnter) {
            // [[2]]: 当拖放时鼠标进入label时, label接受拖放的动作
            QDragEnterEvent *dee = dynamic_cast<QDragEnterEvent *>(event);
            dee->acceptProposedAction();
            return true;

        } else if (event->type() == QEvent::Drop)
        {


            QDropEvent *de = dynamic_cast<QDropEvent *>(event);
            QList<QUrl> urls = de->mimeData()->urls();
            if (urls.isEmpty()) { return true; }
            ui->lineEdit_source->setText( urls.first().toLocalFile());;
        }

    } else if (watched == ui->pushButton_2)
    {
        if (event->type() == QEvent::DragEnter)
        {
            // [[2]]: 当拖放时鼠标进入label时, label接受拖放的动作
            QDragEnterEvent *dee = dynamic_cast<QDragEnterEvent *>(event);
            dee->acceptProposedAction();
            return true;

        } else if (event->type() == QEvent::Drop)
        {
            // [[3]]: 当放操作发生后, 取得拖放的数据
            QDropEvent *de = dynamic_cast<QDropEvent *>(event);
            QList<QUrl> urls = de->mimeData()->urls();
            if (urls.isEmpty()) { return true; }
            ui->lineEdit_target->setText( urls.first().toLocalFile());



        }

    }
            return QMainWindow::eventFilter(watched, event);
 }

显示当前时间

//view time
void MainWindow::slotTimerUpdate()
{

    QDateTime time = QDateTime::currentDateTime();//获取当前日期和时间
    QString str = time.toString("yyyy-MM-dd hh:mm:ss dddd");//格式为年-月-日 小时-分钟-秒 星期
    MainWindow::labDateTime->setText(str);
}

发射信号

QTimer *timer = new QTimer(this);
    timer->start(1000);

接收信号

connect(timer,SIGNAL(timeout()),this,SLOT(slotTimerUpdate()));

Qt背景图片切换

    //ui->change_background_btn->installEventFilter(this);
    //ui->change_background_btn->setAcceptDrops(true);

可不加上面代码

void MainWindow::paintEvent(QPaintEvent *event)
{
    static int pos=0;
    QString picture[2]={":/image/1.jpg",":/image/2.jpg"};
    int n=sizeof(picture)/sizeof(picture[0]);
    QPainter* painter=new QPainter(this);
    //draw picture
    QPixmap pixmap;

    pixmap.load(picture[pos]);
    pixmap.scaled(this->width(),this->height());
    painter->drawPixmap(0,0,this->width(),this->height(),pixmap);
    //图片切换
    //pos=!pos;
    pos++;
    if(pos==n)
    {
        pos=0;
    }
}

信号槽连接

connect(ui->change_background_btn,&QPushButton::clicked,[=](){MainWindow::update();});

Qt配置mysql

https://blog.csdn.net/tianpenglengyue/article/details/120437305
https://blog.csdn.net/joey_ro/article/details/105411135
第一个配置后不行，然后第二个配置好的，先试一试第二个配置。