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
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+++ 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);
+}