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| |
| #include <QtGui> |
| |
| #include "dragwidget.h" |
| |
| DragWidget::DragWidget(QWidget *parent) |
| : QFrame(parent) |
| { |
| setFrameStyle(QFrame::StyledPanel | QFrame::Sunken); |
| dragDropLabel = new QLabel("", this); |
| dragDropLabel->setAlignment(Qt::AlignHCenter); |
| |
| QHBoxLayout *layout = new QHBoxLayout(this); |
| layout->addStretch(0); |
| layout->addWidget(dragDropLabel); |
| layout->addStretch(0); |
| |
| setAcceptDrops(true); |
| } |
| |
| // Accept all actions, but deal with them separately later. |
| //! [0] |
| void DragWidget::dragEnterEvent(QDragEnterEvent *event) |
| { |
| event->acceptProposedAction(); |
| } |
| //! [0] |
| |
| //! [1] |
| void DragWidget::dropEvent(QDropEvent *event) |
| { |
| if (event->source() == this && event->possibleActions() & Qt::MoveAction) |
| return; |
| //! [1] |
| |
| //! [2] |
| if (event->proposedAction() == Qt::MoveAction) { |
| event->acceptProposedAction(); |
| // Process the data from the event. |
| //! [2] |
| emit dragResult(tr("The data was moved here.")); |
| //! [3] |
| } else if (event->proposedAction() == Qt::CopyAction) { |
| event->acceptProposedAction(); |
| // Process the data from the event. |
| //! [3] |
| emit dragResult(tr("The data was copied here.")); |
| //! [4] |
| } else { |
| // Ignore the drop. |
| return; |
| } |
| //! [4] |
| // End of quote |
| |
| emit mimeTypes(event->mimeData()->formats()); |
| setData(event->mimeData()->formats()[0], |
| event->mimeData()->data(event->mimeData()->formats()[0])); |
| //! [5] |
| } |
| //! [5] |
| |
| //! [6] |
| void DragWidget::mousePressEvent(QMouseEvent *event) |
| { |
| if (event->button() == Qt::LeftButton) |
| dragStartPosition = event->pos(); |
| } |
| //! [6] |
| |
| //! [7] |
| void DragWidget::mouseMoveEvent(QMouseEvent *event) |
| { |
| if (!(event->buttons() & Qt::LeftButton)) |
| return; |
| if ((event->pos() - dragStartPosition).manhattanLength() |
| < QApplication::startDragDistance()) |
| return; |
| |
| QDrag *drag = new QDrag(this); |
| QMimeData *mimeData = new QMimeData; |
| |
| mimeData->setData(mimeType, data); |
| drag->setMimeData(mimeData); |
| |
| Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction); |
| //! [7] |
| |
| switch (dropAction) { |
| case Qt::CopyAction: |
| emit dragResult(tr("The text was copied.")); |
| break; |
| case Qt::MoveAction: |
| emit dragResult(tr("The text was moved.")); |
| break; |
| default: |
| emit dragResult(tr("Unknown action.")); |
| break; |
| } |
| //! [8] |
| } |
| //! [8] |
| |
| void DragWidget::setData(const QString &mimetype, const QByteArray &newData) |
| { |
| mimeType = mimetype; |
| data = QByteArray(newData); |
| |
| dragDropLabel->setText(tr("%1 bytes").arg(data.size())); |
| |
| QStringList formats; |
| formats << mimetype; |
| emit mimeTypes(formats); |
| } |