| /**************************************************************************** |
| ** |
| ** 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 <QtWidgets> |
| |
| #include "dragwidget.h" |
| |
| static QLabel *createDragLabel(const QString &text, QWidget *parent) |
| { |
| QLabel *label = new QLabel(text, parent); |
| label->setAutoFillBackground(true); |
| label->setFrameShape(QFrame::Panel); |
| label->setFrameShadow(QFrame::Raised); |
| return label; |
| } |
| |
| static QString hotSpotMimeDataKey() { return QStringLiteral("application/x-hotspot"); } |
| |
| DragWidget::DragWidget(QWidget *parent) |
| : QWidget(parent) |
| { |
| QFile dictionaryFile(QStringLiteral(":/dictionary/words.txt")); |
| dictionaryFile.open(QIODevice::ReadOnly); |
| QTextStream inputStream(&dictionaryFile); |
| |
| int x = 5; |
| int y = 5; |
| |
| while (!inputStream.atEnd()) { |
| QString word; |
| inputStream >> word; |
| if (!word.isEmpty()) { |
| QLabel *wordLabel = createDragLabel(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; |
| } |
| } |
| } |
| |
| setAcceptDrops(true); |
| setMinimumSize(400, qMax(200, y)); |
| setWindowTitle(tr("Draggable Text")); |
| } |
| |
| void DragWidget::dragEnterEvent(QDragEnterEvent *event) |
| { |
| if (event->mimeData()->hasText()) { |
| if (event->source() == this) { |
| event->setDropAction(Qt::MoveAction); |
| event->accept(); |
| } else { |
| event->acceptProposedAction(); |
| } |
| } else { |
| event->ignore(); |
| } |
| } |
| |
| void DragWidget::dropEvent(QDropEvent *event) |
| { |
| if (event->mimeData()->hasText()) { |
| const QMimeData *mime = event->mimeData(); |
| QStringList pieces = mime->text().split(QRegularExpression(QStringLiteral("\\s+")), |
| QString::SkipEmptyParts); |
| QPoint position = event->pos(); |
| QPoint hotSpot; |
| |
| QByteArrayList hotSpotPos = mime->data(hotSpotMimeDataKey()).split(' '); |
| if (hotSpotPos.size() == 2) { |
| hotSpot.setX(hotSpotPos.first().toInt()); |
| hotSpot.setY(hotSpotPos.last().toInt()); |
| } |
| |
| for (const QString &piece : pieces) { |
| QLabel *newLabel = createDragLabel(piece, this); |
| newLabel->move(position - hotSpot); |
| newLabel->show(); |
| newLabel->setAttribute(Qt::WA_DeleteOnClose); |
| |
| position += QPoint(newLabel->width(), 0); |
| } |
| |
| if (event->source() == this) { |
| event->setDropAction(Qt::MoveAction); |
| event->accept(); |
| } else { |
| event->acceptProposedAction(); |
| } |
| } else { |
| event->ignore(); |
| } |
| for (QWidget *widget : findChildren<QWidget *>()) { |
| if (!widget->isVisible()) |
| widget->deleteLater(); |
| } |
| } |
| |
| void DragWidget::mousePressEvent(QMouseEvent *event) |
| { |
| QLabel *child = qobject_cast<QLabel*>(childAt(event->pos())); |
| if (!child) |
| return; |
| |
| QPoint hotSpot = event->pos() - child->pos(); |
| |
| QMimeData *mimeData = new QMimeData; |
| mimeData->setText(child->text()); |
| mimeData->setData(hotSpotMimeDataKey(), |
| QByteArray::number(hotSpot.x()) + ' ' + QByteArray::number(hotSpot.y())); |
| |
| qreal dpr = window()->windowHandle()->devicePixelRatio(); |
| QPixmap pixmap(child->size() * dpr); |
| pixmap.setDevicePixelRatio(dpr); |
| child->render(&pixmap); |
| |
| QDrag *drag = new QDrag(this); |
| drag->setMimeData(mimeData); |
| drag->setPixmap(pixmap); |
| drag->setHotSpot(hotSpot); |
| |
| Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction); |
| |
| if (dropAction == Qt::MoveAction) |
| child->close(); |
| } |