diff options
Diffstat (limited to 'doc/codesnippets/doc/src/snippets/qtreeview-dnd/dragdropmodel.cpp')
-rw-r--r-- | doc/codesnippets/doc/src/snippets/qtreeview-dnd/dragdropmodel.cpp | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/doc/codesnippets/doc/src/snippets/qtreeview-dnd/dragdropmodel.cpp b/doc/codesnippets/doc/src/snippets/qtreeview-dnd/dragdropmodel.cpp new file mode 100644 index 000000000..9ae2f3892 --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/qtreeview-dnd/dragdropmodel.cpp @@ -0,0 +1,147 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial Usage +** Licensees holding valid Qt Commercial licenses may use this file in +** accordance with the Qt Commercial License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Nokia. +** +** 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 http://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of an example program for Qt. +** EDITIONS: NOLIMITS +** +****************************************************************************/ + +#include <QtGui> + +#include "dragdropmodel.h" + +DragDropModel::DragDropModel(const QStringList &strings, QObject *parent) + : TreeModel(strings, parent) +{ +} + +bool DragDropModel::dropMimeData(const QMimeData *data, + Qt::DropAction action, int row, int column, const QModelIndex &parent) +{ + if (action == Qt::IgnoreAction) + return true; + + if (!data->hasFormat("text/plain")) + return false; + + int beginRow; + + if (row != -1) + beginRow = row; + else if (parent.isValid()) + beginRow = 0; + else + beginRow = rowCount(QModelIndex()); + + QByteArray encodedData = data->data("text/plain"); + QDataStream stream(&encodedData, QIODevice::ReadOnly); + QHash<qint64, QMap<int,QHash<int,QString> > > newItems; + + while (!stream.atEnd()) { + qint64 id; + int row; + int column; + QString text; + stream >> id >> row >> column >> text; + newItems[id][row][column] = text; + } + int rows = newItems.count(); + + insertRows(beginRow, rows, parent); + QMap<int,QHash<int,QString> > childItems; + foreach (childItems, newItems.values()) { + QHash<int,QString> rowItems; + foreach (rowItems, childItems.values()) { + foreach (int column, rowItems.keys()) { + QModelIndex idx = index(beginRow, column, parent); + setData(idx, rowItems[column]); + } + ++beginRow; + } + } + + return true; +} + +Qt::ItemFlags DragDropModel::flags(const QModelIndex &index) const +{ + Qt::ItemFlags defaultFlags = TreeModel::flags(index); + + if (index.isValid()) + return Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled | defaultFlags; + else + return Qt::ItemIsDropEnabled | defaultFlags; +} + +QMimeData *DragDropModel::mimeData(const QModelIndexList &indexes) const +{ + QMimeData *mimeData = new QMimeData(); + QByteArray encodedData; + + QDataStream stream(&encodedData, QIODevice::WriteOnly); + + foreach (QModelIndex index, indexes) { + if (index.isValid()) { + QString text = data(index, Qt::DisplayRole).toString(); + stream << index.internalId() << index.row() << index.column() << text; + } + } + + mimeData->setData("text/plain", encodedData); + return mimeData; +} + +QStringList DragDropModel::mimeTypes() const +{ + QStringList types; + types << "text/plain"; + return types; +} + +Qt::DropActions DragDropModel::supportedDropActions() const +{ + return Qt::CopyAction | Qt::MoveAction; +} |