Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module 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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+    A simple model that uses a QStringList as its data source.
+*/
+
+#include "qstringlistmodel.h"
+
+#ifndef QT_NO_STRINGLISTMODEL
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QStringListModel
+    \brief The QStringListModel class provides a model that supplies strings to views.
+
+    \ingroup model-view
+    \mainclass
+
+    QStringListModel is an editable model that can be used for simple
+    cases where you need to display a number of strings in a view
+    widget, such as a QListView or a QComboBox.
+
+    The model provides all the standard functions of an editable
+    model, representing the data in the string list as a model with
+    one column and a number of rows equal to the number of items in
+    the list.
+
+    Model indexes corresponding to items are obtained with the
+    \l{QAbstractListModel::index()}{index()} function, and item flags
+    are obtained with flags().  Item data is read with the data()
+    function and written with setData().  The number of rows (and
+    number of items in the string list) can be found with the
+    rowCount() function.
+
+    The model can be constructed with an existing string list, or
+    strings can be set later with the setStringList() convenience
+    function. Strings can also be inserted in the usual way with the
+    insertRows() function, and removed with removeRows(). The contents
+    of the string list can be retrieved with the stringList()
+    convenience function.
+
+    An example usage of QStringListModel:
+
+    \snippet doc/src/snippets/qstringlistmodel/main.cpp 0
+
+    \sa QAbstractListModel, QAbstractItemModel, {Model Classes}
+*/
+
+/*!
+    Constructs a string list model with the given \a parent.
+*/
+
+QStringListModel::QStringListModel(QObject *parent)
+    : QAbstractListModel(parent)
+{
+}
+
+/*!
+    Constructs a string list model containing the specified \a strings
+    with the given \a parent.
+*/
+
+QStringListModel::QStringListModel(const QStringList &strings, QObject *parent)
+    : QAbstractListModel(parent), lst(strings)
+{
+}
+
+/*!
+    Returns the number of rows in the model. This value corresponds to the
+    number of items in the model's internal string list.
+
+    The optional \a parent argument is in most models used to specify
+    the parent of the rows to be counted. Because this is a list if a
+    valid parent is specified, the result will always be 0.
+
+    \sa insertRows(), removeRows(), QAbstractItemModel::rowCount()
+*/
+
+int QStringListModel::rowCount(const QModelIndex &parent) const
+{
+    if (parent.isValid())
+        return 0;
+
+    return lst.count();
+}
+
+/*!
+    Returns data for the specified \a role, from the item with the
+    given \a index.
+
+    If the view requests an invalid index, an invalid variant is returned.
+
+    \sa setData()
+*/
+
+QVariant QStringListModel::data(const QModelIndex &index, int role) const
+{
+    if (index.row() < 0 || index.row() >= lst.size())
+        return QVariant();
+
+    if (role == Qt::DisplayRole || role == Qt::EditRole)
+        return lst.at(index.row());
+
+    return QVariant();
+}
+
+/*!
+    Returns the flags for the item with the given \a index.
+
+    Valid items are enabled, selectable, editable, drag enabled and drop enabled.
+
+    \sa QAbstractItemModel::flags()
+*/
+
+Qt::ItemFlags QStringListModel::flags(const QModelIndex &index) const
+{
+    if (!index.isValid())
+        return QAbstractItemModel::flags(index) | Qt::ItemIsDropEnabled;
+
+    return QAbstractItemModel::flags(index) | Qt::ItemIsEditable | Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled;
+}
+
+/*!
+    Sets the data for the specified \a role in the item with the given
+    \a index in the model, to the provided \a value.
+
+    The dataChanged() signal is emitted if the item is changed.
+
+    \sa Qt::ItemDataRole, data()
+*/
+
+bool QStringListModel::setData(const QModelIndex &index, const QVariant &value, int role)
+{
+    if (index.row() >= 0 && index.row() < lst.size()
+        && (role == Qt::EditRole || role == Qt::DisplayRole)) {
+        lst.replace(index.row(), value.toString());
+        emit dataChanged(index, index);
+        return true;
+    }
+    return false;
+}
+
+/*!
+    Inserts \a count rows into the model, beginning at the given \a row.
+
+    The \a parent index of the rows is optional and is only used for
+    consistency with QAbstractItemModel. By default, a null index is
+    specified, indicating that the rows are inserted in the top level of
+    the model.
+
+    \sa QAbstractItemModel::insertRows()
+*/
+
+bool QStringListModel::insertRows(int row, int count, const QModelIndex &parent)
+{
+    if (count < 1 || row < 0 || row > rowCount(parent))
+        return false;
+
+    beginInsertRows(QModelIndex(), row, row + count - 1);
+
+    for (int r = 0; r < count; ++r)
+        lst.insert(row, QString());
+
+    endInsertRows();
+
+    return true;
+}
+
+/*!
+    Removes \a count rows from the model, beginning at the given \a row.
+
+    The \a parent index of the rows is optional and is only used for
+    consistency with QAbstractItemModel. By default, a null index is
+    specified, indicating that the rows are removed in the top level of
+    the model.
+
+    \sa QAbstractItemModel::removeRows()
+*/
+
+bool QStringListModel::removeRows(int row, int count, const QModelIndex &parent)
+{
+    if (count <= 0 || row < 0 || (row + count) > rowCount(parent))
+        return false;
+
+    beginRemoveRows(QModelIndex(), row, row + count - 1);
+
+    for (int r = 0; r < count; ++r)
+        lst.removeAt(row);
+
+    endRemoveRows();
+
+    return true;
+}
+
+static bool ascendingLessThan(const QPair<QString, int> &s1, const QPair<QString, int> &s2)
+{
+    return s1.first < s2.first;
+}
+
+static bool decendingLessThan(const QPair<QString, int> &s1, const QPair<QString, int> &s2)
+{
+    return s1.first > s2.first;
+}
+
+/*!
+  \reimp
+*/
+void QStringListModel::sort(int, Qt::SortOrder order)
+{
+    emit layoutAboutToBeChanged();
+
+    QList<QPair<QString, int> > list;
+    for (int i = 0; i < lst.count(); ++i)
+        list.append(QPair<QString, int>(lst.at(i), i));
+
+    if (order == Qt::AscendingOrder)
+        qSort(list.begin(), list.end(), ascendingLessThan);
+    else
+        qSort(list.begin(), list.end(), decendingLessThan);
+
+    lst.clear();
+    QVector<int> forwarding(list.count());
+    for (int i = 0; i < list.count(); ++i) {
+        lst.append(list.at(i).first);
+        forwarding[list.at(i).second] = i;
+    }
+
+    QModelIndexList oldList = persistentIndexList();
+    QModelIndexList newList;
+    for (int i = 0; i < oldList.count(); ++i)
+        newList.append(index(forwarding.at(oldList.at(i).row()), 0));
+    changePersistentIndexList(oldList, newList);
+
+    emit layoutChanged();
+}
+
+/*!
+    Returns the string list used by the model to store data.
+*/
+QStringList QStringListModel::stringList() const
+{
+    return lst;
+}
+
+/*!
+    Sets the model's internal string list to \a strings. The model will
+    notify any attached views that its underlying data has changed.
+
+    \sa dataChanged()
+*/
+void QStringListModel::setStringList(const QStringList &strings)
+{
+    lst = strings;
+    reset();
+}
+
+/*!
+  \reimp
+*/
+Qt::DropActions QStringListModel::supportedDropActions() const
+{
+    return QAbstractItemModel::supportedDropActions() | Qt::MoveAction;
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_STRINGLISTMODEL