diff options
Diffstat (limited to 'src/gui/doc/snippets/draganddrop/dragwidget.cpp')
-rw-r--r-- | src/gui/doc/snippets/draganddrop/dragwidget.cpp | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/src/gui/doc/snippets/draganddrop/dragwidget.cpp b/src/gui/doc/snippets/draganddrop/dragwidget.cpp new file mode 100644 index 0000000000..aa2075a977 --- /dev/null +++ b/src/gui/doc/snippets/draganddrop/dragwidget.cpp @@ -0,0 +1,153 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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); +} |