diff options
Diffstat (limited to 'examples/draganddrop/fridgemagnets/dragwidget.cpp')
| -rw-r--r-- | examples/draganddrop/fridgemagnets/dragwidget.cpp | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/examples/draganddrop/fridgemagnets/dragwidget.cpp b/examples/draganddrop/fridgemagnets/dragwidget.cpp new file mode 100644 index 0000000..43a9588 --- /dev/null +++ b/examples/draganddrop/fridgemagnets/dragwidget.cpp @@ -0,0 +1,212 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtGui> + +#include "draglabel.h" +#include "dragwidget.h" + +//! [0] +DragWidget::DragWidget(QWidget *parent) + : QWidget(parent) +{ + QFile dictionaryFile(":/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("application/x-fridgemagnet")) { + 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("application/x-fridgemagnet")) { + 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("application/x-fridgemagnet")) { + const QMimeData *mime = event->mimeData(); +//! [9] //! [10] + QByteArray itemData = mime->data("application/x-fridgemagnet"); + 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(QRegExp("\\s+"), + QString::SkipEmptyParts); + QPoint position = event->pos(); + + foreach (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("application/x-fridgemagnet", 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] |