C++ QLabel::pos方法代码示例

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    //1，获取图片
    QLabel *child = static_cast<QLabel*>(childAt(event->pos()));
    if(!child->inherits("QLabel")) return;
    QPixmap pixmap = *child->pixmap();
    //2，自定义MIME类型
    QByteArray itemData;
    QDataStream dataStream(&itemData, QIODevice::WriteOnly);
    dataStream<<pixmap<<QPoint(event->pos()-child->pos());
    //3，将数据放入QMimeData中
    QMimeData *mimeData = new QMimeData;
    mimeData->setData("image/png", itemData);
    //4，将数据放到QDrag中
    QDrag *drag = new QDrag(this);
    drag->setMimeData(mimeData);
    drag->setPixmap(pixmap);
    drag->setHotSpot(event->pos()-child->pos());
    //5，原图添加阴影
    QPixmap tempPixmap = pixmap;
    QPainter painter;
    painter.begin(&tempPixmap);
    painter.fillRect(pixmap.rect(),QColor(127,127,127,127));
    painter.end();
    child->setPixmap(tempPixmap);
    //6，执行拖放操作
    if(drag->exec(Qt::CopyAction|Qt::MoveAction, Qt::CopyAction)
        ==Qt::MoveAction)
        child->close();
    else{
        child->show();
        child->setPixmap(pixmap);
    }
}

void DragDropArea::mousePressEvent(QMouseEvent *event)
{
    QLabel *child = static_cast<QLabel*>(childAt(event->pos()));
    if (!child)
        return;

    // Only drag children with dynamic property: "drag"
    if (!child->property("drag").toBool())
        return;

    QPoint hotSpot = event->pos() - child->pos();

    QMimeData *mimeData = new QMimeData;
    mimeData->setText(child->text());
    mimeData->setData("application/x-hotspot",
                      QByteArray::number(hotSpot.x())
                      + " " + QByteArray::number(hotSpot.y()));

    QPixmap pixmap(child->size());
    child->render(&pixmap);

    QDrag *drag = new QDrag(this);
    drag->setMimeData(mimeData);
    drag->setPixmap(pixmap);
    drag->setHotSpot(hotSpot);
    drag->exec();
}

/*! \internal */
QRect QAccessibleDisplay::imagePosition() const
{
    QLabel *label = qobject_cast<QLabel *>(widget());
    if (!label)
        return QRect();
    const QPixmap *pixmap = label->pixmap();
    if (!pixmap)
        return QRect();

    return QRect(label->mapToGlobal(label->pos()), label->size());
}

void MainWindow::mousePressEvent(QMouseEvent *event){

    // imprimindo mensagem de debug
    qDebug()<<"MainWindow::mousePressEvent(QMouseEvent *event)";

    QLabel *label = static_cast<QLabel*>(childAt(event->pos()));
    if (!label || label->objectName()=="centralWidget"
            || label->objectName()==""
            || label->objectName()=="diagrama"){
        return;
    }

    // imprimindo mensagem para debug
    qDebug()<<label->objectName();

    QPixmap pixmap = *label->pixmap();
    QByteArray itemData;
    QDataStream dataStream(&itemData, QIODevice::WriteOnly);
    dataStream << pixmap << QPoint(event->pos() - label->pos());
    QMimeData *mimeData = new QMimeData();
    mimeData->setData("application/x-dnditemdata", itemData);
    QDrag *drag = new QDrag(this);
    drag->setMimeData(mimeData);
    drag->setPixmap(pixmap);
    drag->setHotSpot(event->pos() - label->pos());
    QPoint pointAtual = event->pos();

    if(pointAtual.x() > ui->diagrama->geometry().x()
            && pointAtual.y() > ui->diagrama->geometry().y()
            && pointAtual.x() < ui->diagrama->width()) {
        label->close();
    }

    if (drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction) == Qt::MoveAction) {
        label->show();
        label->setPixmap(pixmap);
    }
}

void
TopBar::fadeOutDude( unsigned int i )
{
//    qDebug() << Q_FUNC_INFO << i;

    QLabel* dude = m_dudes.at( i );
    QPropertyAnimation* ani = new QPropertyAnimation( dude, "pos" );
    ani->setDuration( 1000 );
    ani->setEasingCurve( QEasingCurve::OutQuad );
    ani->setStartValue( dude->pos() );
    ani->setEndValue( QPoint( -10, 0 ) );

    qDebug() << "Animating from" << ani->startValue() << "to" << ani->endValue();
    connect( ani, SIGNAL( finished() ), ani, SLOT( deleteLater() ) );
    ani->start();
}

//---------------------------------------------------------------------------
//  dropEvent
//
//! The event handler that receives drop events.
//
//! @param event the drop event
//---------------------------------------------------------------------------
void
GraphicalRack::dropEvent (QDropEvent* event)
{
    if (event->mimeData()->hasFormat (mime_type)) {
        QByteArray itemData = event->mimeData()->data (mime_type);
        QDataStream dataStream(&itemData, QIODevice::ReadOnly);

        QPixmap pixmap;
        QPoint sourcePos;
        QPoint offset;
        dataStream >> pixmap >> sourcePos >> offset;

        QLabel* droppedTile = new QLabel;
        droppedTile->setPixmap(pixmap);
        droppedTile->setAttribute (Qt::WA_DeleteOnClose);

        QPoint dropPos = event->pos() - offset;

        // Move the tile an extra half tile width in the direction of the
        // move.  This allows the tile to assume a new spot if it is dragged
        // more than halfway onto the spot.
        int extraMove = (sourcePos.x() < dropPos.x() ? 50 / 2
                                                     : -50 / 2);

        dropPos.setX(dropPos.x() + extraMove);

		for(int i = 0; i < m_layout->count(); ++i) {
			QLabel *label = qobject_cast<QLabel*>(m_layout->itemAt(i)->widget());
			if (!label) { // hit the stretcher
				m_layout->insertWidget(i, droppedTile);
				break;
			}
			if (dropPos.x() > label->pos().x()) {
				continue;
			}
			m_layout->insertWidget(i, droppedTile);
			break;
		}

        if (event->source() == this) {
            event->setDropAction (Qt::MoveAction);
            event->accept();
        } else {
            event->acceptProposedAction();
        }
    }

/*! \internal */
QRect QAccessibleDisplay::imagePosition(QAccessible2::CoordinateType coordType)
{
    QLabel *label = qobject_cast<QLabel *>(widget());
    if (!label)
        return QRect();
    const QPixmap *pixmap = label->pixmap();
    if (!pixmap)
        return QRect();

    switch (coordType) {
    case QAccessible2::RelativeToScreen:
        return QRect(label->mapToGlobal(label->pos()), label->size());
    case QAccessible2::RelativeToParent:
        return label->geometry();
    }

    return QRect();
}