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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "draglabel.h" |
| #include "dragwidget.h" |
| |
| #include <QtWidgets> |
| |
| static inline QString fridgetMagnetsMimeType() { return QStringLiteral("application/x-fridgemagnet"); } |
| |
| //! [0] |
| DragWidget::DragWidget(QWidget *parent) |
| : QWidget(parent) |
| { |
| QFile dictionaryFile(QStringLiteral(":/dictionary/words.txt")); |
| dictionaryFile.open(QFile::ReadOnly); |
| QTextStream inputStream(&dictionaryFile); |
| //! [0] |
| |
| //! [1] |
| int x = 5; |
| int y = 5; |
| |
| while (!inputStream.atEnd()) { |
| QString word; |
| inputStream >> word; |
| if (!word.isEmpty()) { |
| DragLabel *wordLabel = new DragLabel(word, this); |
| wordLabel->move(x, y); |
| wordLabel->show(); |
| wordLabel->setAttribute(Qt::WA_DeleteOnClose); |
| x += wordLabel->width() + 2; |
| if (x >= 245) { |
| x = 5; |
| y += wordLabel->height() + 2; |
| } |
| } |
| } |
| //! [1] |
| |
| //! [2] |
| QPalette newPalette = palette(); |
| newPalette.setColor(QPalette::Window, Qt::white); |
| setPalette(newPalette); |
| |
| setMinimumSize(400, qMax(200, y)); |
| setWindowTitle(tr("Fridge Magnets")); |
| //! [2] //! [3] |
| setAcceptDrops(true); |
| } |
| //! [3] |
| |
| //! [4] |
| void DragWidget::dragEnterEvent(QDragEnterEvent *event) |
| { |
| //! [4] //! [5] |
| if (event->mimeData()->hasFormat(fridgetMagnetsMimeType())) { |
| if (children().contains(event->source())) { |
| event->setDropAction(Qt::MoveAction); |
| event->accept(); |
| } else { |
| event->acceptProposedAction(); |
| //! [5] //! [6] |
| } |
| //! [6] //! [7] |
| } else if (event->mimeData()->hasText()) { |
| event->acceptProposedAction(); |
| } else { |
| event->ignore(); |
| } |
| } |
| //! [7] |
| |
| //! [8] |
| void DragWidget::dragMoveEvent(QDragMoveEvent *event) |
| { |
| if (event->mimeData()->hasFormat(fridgetMagnetsMimeType())) { |
| if (children().contains(event->source())) { |
| event->setDropAction(Qt::MoveAction); |
| event->accept(); |
| } else { |
| event->acceptProposedAction(); |
| } |
| } else if (event->mimeData()->hasText()) { |
| event->acceptProposedAction(); |
| } else { |
| event->ignore(); |
| } |
| } |
| //! [8] |
| |
| //! [9] |
| void DragWidget::dropEvent(QDropEvent *event) |
| { |
| if (event->mimeData()->hasFormat(fridgetMagnetsMimeType())) { |
| const QMimeData *mime = event->mimeData(); |
| //! [9] //! [10] |
| QByteArray itemData = mime->data(fridgetMagnetsMimeType()); |
| QDataStream dataStream(&itemData, QIODevice::ReadOnly); |
| |
| QString text; |
| QPoint offset; |
| dataStream >> text >> offset; |
| //! [10] |
| //! [11] |
| DragLabel *newLabel = new DragLabel(text, this); |
| newLabel->move(event->pos() - offset); |
| newLabel->show(); |
| newLabel->setAttribute(Qt::WA_DeleteOnClose); |
| |
| if (event->source() == this) { |
| event->setDropAction(Qt::MoveAction); |
| event->accept(); |
| } else { |
| event->acceptProposedAction(); |
| } |
| //! [11] //! [12] |
| } else if (event->mimeData()->hasText()) { |
| QStringList pieces = event->mimeData()->text().split(QRegularExpression(QStringLiteral("\\s+")), |
| QString::SkipEmptyParts); |
| QPoint position = event->pos(); |
| |
| for (const QString &piece : pieces) { |
| DragLabel *newLabel = new DragLabel(piece, this); |
| newLabel->move(position); |
| newLabel->show(); |
| newLabel->setAttribute(Qt::WA_DeleteOnClose); |
| |
| position += QPoint(newLabel->width(), 0); |
| } |
| |
| event->acceptProposedAction(); |
| } else { |
| event->ignore(); |
| } |
| } |
| //! [12] |
| |
| //! [13] |
| void DragWidget::mousePressEvent(QMouseEvent *event) |
| { |
| //! [13] |
| //! [14] |
| DragLabel *child = static_cast<DragLabel*>(childAt(event->pos())); |
| if (!child) |
| return; |
| |
| QPoint hotSpot = event->pos() - child->pos(); |
| |
| QByteArray itemData; |
| QDataStream dataStream(&itemData, QIODevice::WriteOnly); |
| dataStream << child->labelText() << QPoint(hotSpot); |
| //! [14] |
| |
| //! [15] |
| QMimeData *mimeData = new QMimeData; |
| mimeData->setData(fridgetMagnetsMimeType(), itemData); |
| mimeData->setText(child->labelText()); |
| //! [15] |
| |
| //! [16] |
| QDrag *drag = new QDrag(this); |
| drag->setMimeData(mimeData); |
| drag->setPixmap(*child->pixmap()); |
| drag->setHotSpot(hotSpot); |
| |
| child->hide(); |
| //! [16] |
| |
| //! [17] |
| if (drag->exec(Qt::MoveAction | Qt::CopyAction, Qt::CopyAction) == Qt::MoveAction) |
| child->close(); |
| else |
| child->show(); |
| } |
| //! [17] |