diff options
Diffstat (limited to 'tests/manual/examples/widgets/draganddrop/fridgemagnets/dragwidget.cpp')
-rw-r--r-- | tests/manual/examples/widgets/draganddrop/fridgemagnets/dragwidget.cpp | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/tests/manual/examples/widgets/draganddrop/fridgemagnets/dragwidget.cpp b/tests/manual/examples/widgets/draganddrop/fridgemagnets/dragwidget.cpp new file mode 100644 index 0000000000..a883e7c58a --- /dev/null +++ b/tests/manual/examples/widgets/draganddrop/fridgemagnets/dragwidget.cpp @@ -0,0 +1,176 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#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->position().toPoint() - 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+")), Qt::SkipEmptyParts); + QPoint position = event->position().toPoint(); + + 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->position().toPoint())); + if (!child) + return; + + QPoint hotSpot = event->position().toPoint() - 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] |