Long live Qt!

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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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qdirmodel.h"
+
+#ifndef QT_NO_DIRMODEL
+#include <qstack.h>
+#include <qfile.h>
+#include <qurl.h>
+#include <qmime.h>
+#include <qpair.h>
+#include <qvector.h>
+#include <qobject.h>
+#include <qdatetime.h>
+#include <qlocale.h>
+#include <qstyle.h>
+#include <qapplication.h>
+#include <private/qabstractitemmodel_p.h>
+#include <qdebug.h>
+
+/*!
+    \enum QDirModel::Roles
+    \value FileIconRole
+    \value FilePathRole
+    \value FileNameRole
+*/
+
+QT_BEGIN_NAMESPACE
+
+class QDirModelPrivate : public QAbstractItemModelPrivate
+{
+    Q_DECLARE_PUBLIC(QDirModel)
+
+public:
+    struct QDirNode
+    {
+        QDirNode() : parent(0), populated(false), stat(false) {}
+        ~QDirNode() { children.clear(); }
+        QDirNode *parent;
+        QFileInfo info;
+        QIcon icon; // cache the icon
+        mutable QVector<QDirNode> children;
+        mutable bool populated; // have we read the children
+        mutable bool stat;
+    };
+
+    QDirModelPrivate()
+        : resolveSymlinks(true),
+          readOnly(true),
+          lazyChildCount(false),
+          allowAppendChild(true),
+          iconProvider(&defaultProvider),
+          shouldStat(true) // ### This is set to false by QFileDialog
+    { }
+
+    void init();
+    QDirNode *node(int row, QDirNode *parent) const;
+    QVector<QDirNode> children(QDirNode *parent, bool stat) const;
+
+    void _q_refresh();
+
+    void savePersistentIndexes();
+    void restorePersistentIndexes();
+
+    QFileInfoList entryInfoList(const QString &path) const;
+    QStringList entryList(const QString &path) const;
+
+    QString name(const QModelIndex &index) const;
+    QString size(const QModelIndex &index) const;
+    QString type(const QModelIndex &index) const;
+    QString time(const QModelIndex &index) const;
+
+    void appendChild(QDirModelPrivate::QDirNode *parent, const QString &path) const;
+    static QFileInfo resolvedInfo(QFileInfo info);
+
+    inline QDirNode *node(const QModelIndex &index) const;
+    inline void populate(QDirNode *parent) const;
+    inline void clear(QDirNode *parent) const;
+
+    void invalidate();
+
+    mutable QDirNode root;
+    bool resolveSymlinks;
+    bool readOnly;
+    bool lazyChildCount;
+    bool allowAppendChild;
+
+    QDir::Filters filters;
+    QDir::SortFlags sort;
+    QStringList nameFilters;
+
+    QFileIconProvider *iconProvider;
+    QFileIconProvider defaultProvider;
+
+    struct SavedPersistent {
+        QString path;
+        int column;
+        QPersistentModelIndexData *data;
+        QPersistentModelIndex index;
+    };
+    QList<SavedPersistent> savedPersistent;
+    QPersistentModelIndex toBeRefreshed;
+
+    bool shouldStat; // use the "carefull not to stat directories" mode
+};
+
+void qt_setDirModelShouldNotStat(QDirModelPrivate *modelPrivate)
+{
+    modelPrivate->shouldStat = false;
+}
+
+QDirModelPrivate::QDirNode *QDirModelPrivate::node(const QModelIndex &index) const
+{
+    QDirModelPrivate::QDirNode *n =
+        static_cast<QDirModelPrivate::QDirNode*>(index.internalPointer());
+    Q_ASSERT(n);
+    return n;
+}
+
+void QDirModelPrivate::populate(QDirNode *parent) const
+{
+    Q_ASSERT(parent);
+    parent->children = children(parent, parent->stat);
+    parent->populated = true;
+}
+
+void QDirModelPrivate::clear(QDirNode *parent) const
+{
+     Q_ASSERT(parent);
+     parent->children.clear();
+     parent->populated = false;
+}
+
+void QDirModelPrivate::invalidate()
+{
+    QStack<const QDirNode*> nodes;
+    nodes.push(&root);
+    while (!nodes.empty()) {
+        const QDirNode *current = nodes.pop();
+        current->stat = false;
+        const QVector<QDirNode> children = current->children;
+        for (int i = 0; i < children.count(); ++i)
+            nodes.push(&children.at(i));
+    }
+}
+
+/*!
+    \class QDirModel
+
+    \brief The QDirModel class provides a data model for the local filesystem.
+
+    \ingroup model-view
+
+    This class provides access to the local filesystem, providing functions
+    for renaming and removing files and directories, and for creating new
+    directories. In the simplest case, it can be used with a suitable display
+    widget as part of a browser or filer.
+
+    QDirModel keeps a cache with file information. The cache needs to be
+    updated with refresh().
+
+    A directory model that displays the contents of a default directory
+    is usually constructed with a parent object:
+
+    \snippet doc/src/snippets/shareddirmodel/main.cpp 2
+
+    A tree view can be used to display the contents of the model
+
+    \snippet doc/src/snippets/shareddirmodel/main.cpp 4
+
+    and the contents of a particular directory can be displayed by
+    setting the tree view's root index:
+
+    \snippet doc/src/snippets/shareddirmodel/main.cpp 7
+
+    The view's root index can be used to control how much of a
+    hierarchical model is displayed. QDirModel provides a convenience
+    function that returns a suitable model index for a path to a
+    directory within the model.
+
+    QDirModel can be accessed using the standard interface provided by
+    QAbstractItemModel, but it also provides some convenience functions
+    that are specific to a directory model. The fileInfo() and isDir()
+    functions provide information about the underlying files and directories
+    related to items in the model.
+
+    Directories can be created and removed using mkdir(), rmdir(), and the
+    model will be automatically updated to take the changes into account.
+
+    \note QDirModel requires an instance of a GUI application.
+
+    \sa nameFilters(), setFilter(), filter(), QListView, QTreeView,
+    {Dir View Example}, {Model Classes}
+*/
+
+/*!
+    Constructs a new directory model with the given \a parent.
+    Only those files matching the \a nameFilters and the
+    \a filters are included in the model. The sort order is given by the
+    \a sort flags.
+*/
+
+QDirModel::QDirModel(const QStringList &nameFilters,
+                     QDir::Filters filters,
+                     QDir::SortFlags sort,
+                     QObject *parent)
+    : QAbstractItemModel(*new QDirModelPrivate, parent)
+{
+    Q_D(QDirModel);
+    // we always start with QDir::drives()
+    d->nameFilters = nameFilters.isEmpty() ? QStringList(QLatin1String("*")) : nameFilters;
+    d->filters = filters;
+    d->sort = sort;
+    d->root.parent = 0;
+    d->root.info = QFileInfo();
+    d->clear(&d->root);
+}
+
+/*!
+  Constructs a directory model with the given \a parent.
+*/
+
+QDirModel::QDirModel(QObject *parent)
+    : QAbstractItemModel(*new QDirModelPrivate, parent)
+{
+    Q_D(QDirModel);
+    d->init();
+}
+
+/*!
+    \internal
+*/
+QDirModel::QDirModel(QDirModelPrivate &dd, QObject *parent)
+    : QAbstractItemModel(dd, parent)
+{
+    Q_D(QDirModel);
+    d->init();
+}
+
+/*!
+  Destroys this directory model.
+*/
+
+QDirModel::~QDirModel()
+{
+
+}
+
+/*!
+  Returns the model item index for the item in the \a parent with the
+  given \a row and \a column.
+
+*/
+
+QModelIndex QDirModel::index(int row, int column, const QModelIndex &parent) const
+{
+    Q_D(const QDirModel);
+    // note that rowCount does lazy population
+    if (column < 0 || column >= columnCount(parent) || row < 0 || parent.column() > 0)
+        return QModelIndex();
+    // make sure the list of children is up to date
+    QDirModelPrivate::QDirNode *p = (d->indexValid(parent) ? d->node(parent) : &d->root);
+    Q_ASSERT(p);
+    if (!p->populated)
+        d->populate(p); // populate without stat'ing
+    if (row >= p->children.count())
+        return QModelIndex();
+    // now get the internal pointer for the index
+    QDirModelPrivate::QDirNode *n = d->node(row, d->indexValid(parent) ? p : 0);
+    Q_ASSERT(n);
+
+    return createIndex(row, column, n);
+}
+
+/*!
+  Return the parent of the given \a child model item.
+*/
+
+QModelIndex QDirModel::parent(const QModelIndex &child) const
+{
+    Q_D(const QDirModel);
+
+    if (!d->indexValid(child))
+	return QModelIndex();
+    QDirModelPrivate::QDirNode *node = d->node(child);
+    QDirModelPrivate::QDirNode *par = (node ? node->parent : 0);
+    if (par == 0) // parent is the root node
+	return QModelIndex();
+
+    // get the parent's row
+    const QVector<QDirModelPrivate::QDirNode> children =
+        par->parent ? par->parent->children : d->root.children;
+    Q_ASSERT(children.count() > 0);
+    int row = (par - &(children.at(0)));
+    Q_ASSERT(row >= 0);
+
+    return createIndex(row, 0, par);
+}
+
+/*!
+  Returns the number of rows in the \a parent model item.
+
+*/
+
+int QDirModel::rowCount(const QModelIndex &parent) const
+{
+    Q_D(const QDirModel);
+    if (parent.column() > 0)
+        return 0;
+
+    if (!parent.isValid()) {
+        if (!d->root.populated) // lazy population
+            d->populate(&d->root);
+        return d->root.children.count();
+    }
+    if (parent.model() != this)
+        return 0;
+    QDirModelPrivate::QDirNode *p = d->node(parent);
+    if (p->info.isDir() && !p->populated) // lazy population
+        d->populate(p);
+    return p->children.count();
+}
+
+/*!
+  Returns the number of columns in the \a parent model item.
+
+*/
+
+int QDirModel::columnCount(const QModelIndex &parent) const
+{
+    if (parent.column() > 0)
+        return 0;
+    return 4;
+}
+
+/*!
+  Returns the data for the model item \a index with the given \a role.
+*/
+QVariant QDirModel::data(const QModelIndex &index, int role) const
+{
+    Q_D(const QDirModel);
+    if (!d->indexValid(index))
+        return QVariant();
+
+    if (role == Qt::DisplayRole || role == Qt::EditRole) {
+        switch (index.column()) {
+        case 0: return d->name(index);
+        case 1: return d->size(index);
+        case 2: return d->type(index);
+        case 3: return d->time(index);
+        default:
+            qWarning("data: invalid display value column %d", index.column());
+            return QVariant();
+        }
+    }
+
+    if (index.column() == 0) {
+        if (role == FileIconRole)
+            return fileIcon(index);
+        if (role == FilePathRole)
+            return filePath(index);
+        if (role == FileNameRole)
+            return fileName(index);
+    }
+
+    if (index.column() == 1 && Qt::TextAlignmentRole == role) {
+        return Qt::AlignRight;
+    }
+    return QVariant();
+}
+
+/*!
+  Sets the data for the model item \a index with the given \a role to
+  the data referenced by the \a value. Returns true if successful;
+  otherwise returns false.
+
+  \sa Qt::ItemDataRole
+*/
+
+bool QDirModel::setData(const QModelIndex &index, const QVariant &value, int role)
+{
+    Q_D(QDirModel);
+    if (!d->indexValid(index) || index.column() != 0
+        || (flags(index) & Qt::ItemIsEditable) == 0 || role != Qt::EditRole)
+        return false;
+
+    QDirModelPrivate::QDirNode *node = d->node(index);
+    QDir dir = node->info.dir();
+    QString name = value.toString();
+    if (dir.rename(node->info.fileName(), name)) {
+        node->info = QFileInfo(dir, name);
+        QModelIndex sibling = index.sibling(index.row(), 3);
+        emit dataChanged(index, sibling);
+
+        d->toBeRefreshed = index.parent();
+        QMetaObject::invokeMethod(this, "_q_refresh", Qt::QueuedConnection);
+
+        return true;
+    }
+
+    return false;
+}
+
+/*!
+  Returns the data stored under the given \a role for the specified \a section
+  of the header with the given \a orientation.
+*/
+
+QVariant QDirModel::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    if (orientation == Qt::Horizontal) {
+        if (role != Qt::DisplayRole)
+            return QVariant();
+	switch (section) {
+        case 0: return tr("Name");
+        case 1: return tr("Size");
+        case 2: return
+#ifdef Q_OS_MAC
+                       tr("Kind", "Match OS X Finder");
+#else
+                       tr("Type", "All other platforms");
+#endif
+        // Windows   - Type
+        // OS X      - Kind
+        // Konqueror - File Type
+        // Nautilus  - Type
+        case 3: return tr("Date Modified");
+        default: return QVariant();
+        }
+    }
+    return QAbstractItemModel::headerData(section, orientation, role);
+}
+
+/*!
+  Returns true if the \a parent model item has children; otherwise
+  returns false.
+*/
+
+bool QDirModel::hasChildren(const QModelIndex &parent) const
+{
+    Q_D(const QDirModel);
+    if (parent.column() > 0)
+        return false;
+
+    if (!parent.isValid()) // the invalid index is the "My Computer" item
+        return true; // the drives
+    QDirModelPrivate::QDirNode *p = d->node(parent);
+    Q_ASSERT(p);
+
+    if (d->lazyChildCount) // optimization that only checks for children if the node has been populated
+        return p->info.isDir();
+    return p->info.isDir() && rowCount(parent) > 0;
+}
+
+/*!
+  Returns the item flags for the given \a index in the model.
+
+  \sa Qt::ItemFlags
+*/
+Qt::ItemFlags QDirModel::flags(const QModelIndex &index) const
+{
+    Q_D(const QDirModel);
+    Qt::ItemFlags flags = QAbstractItemModel::flags(index);
+    if (!d->indexValid(index))
+        return flags;
+    flags |= Qt::ItemIsDragEnabled;
+    if (d->readOnly)
+        return flags;
+    QDirModelPrivate::QDirNode *node = d->node(index);
+    if ((index.column() == 0) && node->info.isWritable()) {
+        flags |= Qt::ItemIsEditable;
+        if (fileInfo(index).isDir()) // is directory and is editable
+            flags |= Qt::ItemIsDropEnabled;
+    }
+    return flags;
+}
+
+/*!
+  Sort the model items in the \a column using the \a order given.
+  The order is a value defined in \l Qt::SortOrder.
+*/
+
+void QDirModel::sort(int column, Qt::SortOrder order)
+{
+    QDir::SortFlags sort = QDir::DirsFirst | QDir::IgnoreCase;
+    if (order == Qt::DescendingOrder)
+        sort |= QDir::Reversed;
+
+    switch (column) {
+    case 0:
+        sort |= QDir::Name;
+        break;
+    case 1:
+        sort |= QDir::Size;
+        break;
+    case 2:
+        sort |= QDir::Type;
+        break;
+    case 3:
+        sort |= QDir::Time;
+        break;
+    default:
+        break;
+    }
+
+    setSorting(sort);
+}
+
+/*!
+    Returns a list of MIME types that can be used to describe a list of items
+    in the model.
+*/
+
+QStringList QDirModel::mimeTypes() const
+{
+    return QStringList(QLatin1String("text/uri-list"));
+}
+
+/*!
+    Returns an object that contains a serialized description of the specified
+    \a indexes. The format used to describe the items corresponding to the
+    indexes is obtained from the mimeTypes() function.
+
+    If the list of indexes is empty, 0 is returned rather than a serialized
+    empty list.
+*/
+
+QMimeData *QDirModel::mimeData(const QModelIndexList &indexes) const
+{
+    QList<QUrl> urls;
+    QList<QModelIndex>::const_iterator it = indexes.begin();
+    for (; it != indexes.end(); ++it)
+        if ((*it).column() == 0)
+            urls << QUrl::fromLocalFile(filePath(*it));
+    QMimeData *data = new QMimeData();
+    data->setUrls(urls);
+    return data;
+}
+
+/*!
+    Handles the \a data supplied by a drag and drop operation that ended with
+    the given \a action over the row in the model specified by the \a row and
+    \a column and by the \a parent index.
+
+    \sa supportedDropActions()
+*/
+
+bool QDirModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
+                             int /* row */, int /* column */, const QModelIndex &parent)
+{
+    Q_D(QDirModel);
+    if (!d->indexValid(parent) || isReadOnly())
+        return false;
+
+    bool success = true;
+    QString to = filePath(parent) + QDir::separator();
+    QModelIndex _parent = parent;
+
+    QList<QUrl> urls = data->urls();
+    QList<QUrl>::const_iterator it = urls.constBegin();
+
+    switch (action) {
+    case Qt::CopyAction:
+        for (; it != urls.constEnd(); ++it) {
+            QString path = (*it).toLocalFile();
+            success = QFile::copy(path, to + QFileInfo(path).fileName()) && success;
+        }
+        break;
+    case Qt::LinkAction:
+        for (; it != urls.constEnd(); ++it) {
+            QString path = (*it).toLocalFile();
+            success = QFile::link(path, to + QFileInfo(path).fileName()) && success;
+        }
+        break;
+    case Qt::MoveAction:
+        for (; it != urls.constEnd(); ++it) {
+            QString path = (*it).toLocalFile();
+            if (QFile::copy(path, to + QFileInfo(path).fileName())
+               && QFile::remove(path)) {
+                QModelIndex idx=index(QFileInfo(path).path());
+                if (idx.isValid()) {
+                    refresh(idx);
+                    //the previous call to refresh may invalidate the _parent. so recreate a new QModelIndex
+                    _parent = index(to);
+                }
+            } else {
+                success = false;
+            }
+        }
+        break;
+    default:
+        return false;
+    }
+
+    if (success)
+        refresh(_parent);
+
+    return success;
+}
+
+/*!
+  Returns the drop actions supported by this model.
+
+  \sa Qt::DropActions
+*/
+
+Qt::DropActions QDirModel::supportedDropActions() const
+{
+    return Qt::CopyAction | Qt::MoveAction; // FIXME: LinkAction is not supported yet
+}
+
+/*!
+  Sets the \a provider of file icons for the directory model.
+
+*/
+
+void QDirModel::setIconProvider(QFileIconProvider *provider)
+{
+    Q_D(QDirModel);
+    d->iconProvider = provider;
+}
+
+/*!
+  Returns the file icon provider for this directory model.
+*/
+
+QFileIconProvider *QDirModel::iconProvider() const
+{
+    Q_D(const QDirModel);
+    return d->iconProvider;
+}
+
+/*!
+  Sets the name \a filters for the directory model.
+*/
+
+void QDirModel::setNameFilters(const QStringList &filters)
+{
+    Q_D(QDirModel);
+    d->nameFilters = filters;
+    emit layoutAboutToBeChanged();
+    if (d->shouldStat)
+       refresh(QModelIndex());
+    else
+        d->invalidate();
+    emit layoutChanged();
+}
+
+/*!
+  Returns a list of filters applied to the names in the model.
+*/
+
+QStringList QDirModel::nameFilters() const
+{
+    Q_D(const QDirModel);
+    return d->nameFilters;
+}
+
+/*!
+  Sets the directory model's filter to that specified by \a filters.
+
+  Note that the filter you set should always include the QDir::AllDirs enum value,
+  otherwise QDirModel won't be able to read the directory structure.
+
+  \sa QDir::Filters
+*/
+
+void QDirModel::setFilter(QDir::Filters filters)
+{
+    Q_D(QDirModel);
+    d->filters = filters;
+    emit layoutAboutToBeChanged();
+    if (d->shouldStat)
+        refresh(QModelIndex());
+    else
+        d->invalidate();
+    emit layoutChanged();
+}
+
+/*!
+  Returns the filter specification for the directory model.
+
+  \sa QDir::Filters
+*/
+
+QDir::Filters QDirModel::filter() const
+{
+    Q_D(const QDirModel);
+    return d->filters;
+}
+
+/*!
+  Sets the directory model's sorting order to that specified by \a sort.
+
+  \sa QDir::SortFlags
+*/
+
+void QDirModel::setSorting(QDir::SortFlags sort)
+{
+    Q_D(QDirModel);
+    d->sort = sort;
+    emit layoutAboutToBeChanged();
+    if (d->shouldStat)
+        refresh(QModelIndex());
+    else
+        d->invalidate();
+    emit layoutChanged();
+}
+
+/*!
+  Returns the sorting method used for the directory model.
+
+  \sa QDir::SortFlags */
+
+QDir::SortFlags QDirModel::sorting() const
+{
+    Q_D(const QDirModel);
+    return d->sort;
+}
+
+/*!
+    \property QDirModel::resolveSymlinks
+    \brief Whether the directory model should resolve symbolic links
+
+    This is only relevant on operating systems that support symbolic
+    links.
+*/
+void QDirModel::setResolveSymlinks(bool enable)
+{
+    Q_D(QDirModel);
+    d->resolveSymlinks = enable;
+}
+
+bool QDirModel::resolveSymlinks() const
+{
+    Q_D(const QDirModel);
+    return d->resolveSymlinks;
+}
+
+/*!
+  \property QDirModel::readOnly
+  \brief Whether the directory model allows writing to the file system
+
+  If this property is set to false, the directory model will allow renaming, copying
+  and deleting of files and directories.
+
+  This property is true by default
+*/
+
+void QDirModel::setReadOnly(bool enable)
+{
+    Q_D(QDirModel);
+    d->readOnly = enable;
+}
+
+bool QDirModel::isReadOnly() const
+{
+    Q_D(const QDirModel);
+    return d->readOnly;
+}
+
+/*!
+  \property QDirModel::lazyChildCount
+  \brief Whether the directory model optimizes the hasChildren function
+  to only check if the item is a directory.
+
+  If this property is set to false, the directory model will make sure that a directory
+  actually containes any files before reporting that it has children.
+  Otherwise the directory model will report that an item has children if the item
+  is a directory.
+
+  This property is false by default
+*/
+
+void QDirModel::setLazyChildCount(bool enable)
+{
+    Q_D(QDirModel);
+    d->lazyChildCount = enable;
+}
+
+bool QDirModel::lazyChildCount() const
+{
+    Q_D(const QDirModel);
+    return d->lazyChildCount;
+}
+
+/*!
+  QDirModel caches file information. This function updates the
+  cache. The \a parent parameter is the directory from which the
+  model is updated; the default value will update the model from
+  root directory of the file system (the entire model).
+*/
+
+void QDirModel::refresh(const QModelIndex &parent)
+{
+    Q_D(QDirModel);
+
+    QDirModelPrivate::QDirNode *n = d->indexValid(parent) ? d->node(parent) : &(d->root);
+
+    int rows = n->children.count();
+    if (rows == 0) {
+        emit layoutAboutToBeChanged();
+        n->stat = true; // make sure that next time we read all the info
+        n->populated = false;
+        emit layoutChanged();
+        return;
+    }
+
+    emit layoutAboutToBeChanged();
+    d->savePersistentIndexes();
+    d->rowsAboutToBeRemoved(parent, 0, rows - 1);
+    n->stat = true; // make sure that next time we read all the info
+    d->clear(n);
+    d->rowsRemoved(parent, 0, rows - 1);
+    d->restorePersistentIndexes();
+    emit layoutChanged();
+}
+
+/*!
+    \overload
+
+    Returns the model item index for the given \a path.
+*/
+
+QModelIndex QDirModel::index(const QString &path, int column) const
+{
+    Q_D(const QDirModel);
+
+    if (path.isEmpty() || path == QCoreApplication::translate("QFileDialog", "My Computer"))
+        return QModelIndex();
+
+    QString absolutePath = QDir(path).absolutePath();
+#if defined(Q_OS_WIN) && !defined(Q_OS_WINCE)
+    absolutePath = absolutePath.toLower();
+    // On Windows, "filename......." and "filename" are equivalent
+    if (absolutePath.endsWith(QLatin1Char('.'))) {
+        int i;
+        for (i = absolutePath.count() - 1; i >= 0; --i) {
+            if (absolutePath.at(i) != QLatin1Char('.'))
+                break;
+        }
+        absolutePath = absolutePath.left(i+1);
+    }
+#endif
+
+    QStringList pathElements = absolutePath.split(QLatin1Char('/'), QString::SkipEmptyParts);
+    if ((pathElements.isEmpty() || !QFileInfo(path).exists())
+#if !defined(Q_OS_WIN) || defined(Q_OS_WINCE)
+        && path != QLatin1String("/")
+#endif
+        )
+        return QModelIndex();
+
+    QModelIndex idx; // start with "My Computer"
+    if (!d->root.populated) // make sure the root is populated
+        d->populate(&d->root);
+
+#if defined(Q_OS_WIN) && !defined(Q_OS_WINCE)
+    if (absolutePath.startsWith(QLatin1String("//"))) { // UNC path
+        QString host = pathElements.first();
+        int r = 0;
+        for (; r < d->root.children.count(); ++r)
+            if (d->root.children.at(r).info.fileName() == host)
+                break;
+        bool childAppended = false;
+        if (r >= d->root.children.count() && d->allowAppendChild) {
+            d->appendChild(&d->root, QLatin1String("//") + host);
+            childAppended = true;
+        }
+        idx = index(r, 0, QModelIndex());
+        pathElements.pop_front();
+        if (childAppended)
+            emit const_cast<QDirModel*>(this)->layoutChanged();
+    } else if (pathElements.at(0).endsWith(QLatin1Char(':'))) {
+        pathElements[0] += QLatin1Char('/');
+    }
+#else
+    // add the "/" item, since it is a valid path element on unix
+    pathElements.prepend(QLatin1String("/"));
+#endif
+
+    for (int i = 0; i < pathElements.count(); ++i) {
+        Q_ASSERT(!pathElements.at(i).isEmpty());
+        QString element = pathElements.at(i);
+        QDirModelPrivate::QDirNode *parent = (idx.isValid() ? d->node(idx) : &d->root);
+
+        Q_ASSERT(parent);
+        if (!parent->populated)
+            d->populate(parent);
+
+        // search for the element in the child nodes first
+        int row = -1;
+        for (int j = parent->children.count() - 1; j >= 0; --j) {
+            const QFileInfo& fi = parent->children.at(j).info;
+            QString childFileName;
+#if defined(Q_OS_WIN) && !defined(Q_OS_WINCE)
+            childFileName = idx.isValid() ? fi.fileName() : fi.absoluteFilePath();
+            childFileName = childFileName.toLower();
+#else
+            childFileName = idx.isValid() ? fi.fileName() : fi.absoluteFilePath();
+#endif
+            if (childFileName == element) {
+                if (i == pathElements.count() - 1)
+                    parent->children[j].stat = true;
+                row = j;
+                break;
+            }
+        }
+
+        // we couldn't find the path element, we create a new node since we _know_ that the path is valid
+        if (row == -1) {
+#if defined(Q_OS_WINCE)
+            QString newPath;
+            if (parent->info.isRoot())
+                newPath = parent->info.absoluteFilePath() + element;
+            else
+                newPath= parent->info.absoluteFilePath() + QLatin1Char('/') + element;
+#else
+            QString newPath = parent->info.absoluteFilePath() + QLatin1Char('/') + element;
+#endif
+            if (!d->allowAppendChild || !QFileInfo(newPath).isDir())
+                return QModelIndex();
+            d->appendChild(parent, newPath);
+            row = parent->children.count() - 1;
+            if (i == pathElements.count() - 1) // always stat children of  the last element
+                parent->children[row].stat = true;
+            emit const_cast<QDirModel*>(this)->layoutChanged();
+        }
+
+        Q_ASSERT(row >= 0);
+        idx = createIndex(row, 0, static_cast<void*>(&parent->children[row]));
+        Q_ASSERT(idx.isValid());
+    }
+
+    if (column != 0)
+        return idx.sibling(idx.row(), column);
+    return idx;
+}
+
+/*!
+  Returns true if the model item \a index represents a directory;
+  otherwise returns false.
+*/
+
+bool QDirModel::isDir(const QModelIndex &index) const
+{
+    Q_D(const QDirModel);
+    Q_ASSERT(d->indexValid(index));
+    QDirModelPrivate::QDirNode *node = d->node(index);
+    return node->info.isDir();
+}
+
+/*!
+  Create a directory with the \a name in the \a parent model item.
+*/
+
+QModelIndex QDirModel::mkdir(const QModelIndex &parent, const QString &name)
+{
+    Q_D(QDirModel);
+    if (!d->indexValid(parent) || isReadOnly())
+        return QModelIndex();
+
+    QDirModelPrivate::QDirNode *p = d->node(parent);
+    QString path = p->info.absoluteFilePath();
+    // For the indexOf() method to work, the new directory has to be a direct child of
+    // the parent directory.
+
+    QDir newDir(name);
+    QDir dir(path);
+    if (newDir.isRelative())
+        newDir = QDir(path + QLatin1Char('/') + name);
+    QString childName = newDir.dirName(); // Get the singular name of the directory
+    newDir.cdUp();
+
+    if (newDir.absolutePath() != dir.absolutePath() || !dir.mkdir(name))
+        return QModelIndex(); // nothing happened
+
+    refresh(parent);
+
+    QStringList entryList = d->entryList(path);
+    int r = entryList.indexOf(childName);
+    QModelIndex i = index(r, 0, parent); // return an invalid index
+
+    return i;
+}
+
+/*!
+  Removes the directory corresponding to the model item \a index in the
+  directory model and \bold{deletes the corresponding directory from the
+  file system}, returning true if successful. If the directory cannot be
+  removed, false is returned.
+
+  \warning This function deletes directories from the file system; it does
+  \bold{not} move them to a location where they can be recovered.
+
+  \sa remove()
+*/
+
+bool QDirModel::rmdir(const QModelIndex &index)
+{
+    Q_D(QDirModel);
+    if (!d->indexValid(index) || isReadOnly())
+        return false;
+
+    QDirModelPrivate::QDirNode *n = d_func()->node(index);
+    if (!n->info.isDir()) {
+        qWarning("rmdir: the node is not a directory");
+        return false;
+    }
+
+    QModelIndex par = parent(index);
+    QDirModelPrivate::QDirNode *p = d_func()->node(par);
+    QDir dir = p->info.dir(); // parent dir
+    QString path = n->info.absoluteFilePath();
+    if (!dir.rmdir(path))
+        return false;
+
+    refresh(par);
+
+    return true;
+}
+
+/*!
+  Removes the model item \a index from the directory model and \bold{deletes the
+  corresponding file from the file system}, returning true if successful. If the
+  item cannot be removed, false is returned.
+
+  \warning This function deletes files from the file system; it does \bold{not}
+  move them to a location where they can be recovered.
+
+  \sa rmdir()
+*/
+
+bool QDirModel::remove(const QModelIndex &index)
+{
+    Q_D(QDirModel);
+    if (!d->indexValid(index) || isReadOnly())
+        return false;
+
+    QDirModelPrivate::QDirNode *n = d_func()->node(index);
+    if (n->info.isDir())
+        return false;
+
+    QModelIndex par = parent(index);
+    QDirModelPrivate::QDirNode *p = d_func()->node(par);
+    QDir dir = p->info.dir(); // parent dir
+    QString path = n->info.absoluteFilePath();
+    if (!dir.remove(path))
+        return false;
+
+    refresh(par);
+
+    return true;
+}
+
+/*!
+  Returns the path of the item stored in the model under the
+  \a index given.
+
+*/
+
+QString QDirModel::filePath(const QModelIndex &index) const
+{
+    Q_D(const QDirModel);
+    if (d->indexValid(index)) {
+        QFileInfo fi = fileInfo(index);
+        if (d->resolveSymlinks && fi.isSymLink())
+            fi = d->resolvedInfo(fi);
+        return QDir::cleanPath(fi.absoluteFilePath());
+    }
+    return QString(); // root path
+}
+
+/*!
+  Returns the name of the item stored in the model under the
+  \a index given.
+
+*/
+
+QString QDirModel::fileName(const QModelIndex &index) const
+{
+    Q_D(const QDirModel);
+    if (!d->indexValid(index))
+        return QString();
+    QFileInfo info = fileInfo(index);
+    if (info.isRoot())
+        return info.absoluteFilePath();
+    if (d->resolveSymlinks && info.isSymLink())
+        info = d->resolvedInfo(info);
+    return info.fileName();
+}
+
+/*!
+  Returns the icons for the item stored in the model under the given
+  \a index.
+*/
+
+QIcon QDirModel::fileIcon(const QModelIndex &index) const
+{
+    Q_D(const QDirModel);
+    if (!d->indexValid(index))
+        return d->iconProvider->icon(QFileIconProvider::Computer);
+    QDirModelPrivate::QDirNode *node = d->node(index);
+    if (node->icon.isNull())
+        node->icon = d->iconProvider->icon(node->info);
+    return node->icon;
+}
+
+/*!
+  Returns the file information for the specified model \a index.
+
+  \bold{Note:} If the model index represents a symbolic link in the
+  underlying filing system, the file information returned will contain
+  information about the symbolic link itself, regardless of whether
+  resolveSymlinks is enabled or not.
+
+  \sa QFileInfo::symLinkTarget()
+*/
+
+QFileInfo QDirModel::fileInfo(const QModelIndex &index) const
+{
+    Q_D(const QDirModel);
+    Q_ASSERT(d->indexValid(index));
+
+    QDirModelPrivate::QDirNode *node = d->node(index);
+    return node->info;
+}
+
+/*!
+  \fn QObject *QDirModel::parent() const
+  \internal
+*/
+
+/*
+  The root node is never seen outside the model.
+*/
+
+void QDirModelPrivate::init()
+{
+    filters = QDir::AllEntries | QDir::NoDotAndDotDot;
+    sort = QDir::Name;
+    nameFilters << QLatin1String("*");
+    root.parent = 0;
+    root.info = QFileInfo();
+    clear(&root);
+}
+
+QDirModelPrivate::QDirNode *QDirModelPrivate::node(int row, QDirNode *parent) const
+{
+    if (row < 0)
+	return 0;
+
+    bool isDir = !parent || parent->info.isDir();
+    QDirNode *p = (parent ? parent : &root);
+    if (isDir && !p->populated)
+        populate(p); // will also resolve symlinks
+
+    if (row >= p->children.count()) {
+        qWarning("node: the row does not exist");
+        return 0;
+    }
+
+    return const_cast<QDirNode*>(&p->children.at(row));
+}
+
+QVector<QDirModelPrivate::QDirNode> QDirModelPrivate::children(QDirNode *parent, bool stat) const
+{
+    Q_ASSERT(parent);
+    QFileInfoList infoList;
+    if (parent == &root) {
+        parent = 0;
+        infoList = QDir::drives();
+    } else if (parent->info.isDir()) {
+        //resolve directory links only if requested.
+        if (parent->info.isSymLink() && resolveSymlinks) {
+            QString link = parent->info.symLinkTarget();
+            if (link.size() > 1 && link.at(link.size() - 1) == QDir::separator())
+                link.chop(1);
+            if (stat)
+                infoList = entryInfoList(link);
+            else
+                infoList = QDir(link).entryInfoList(nameFilters, QDir::AllEntries | QDir::System);
+        } else {
+            if (stat)
+                infoList = entryInfoList(parent->info.absoluteFilePath());
+            else
+                infoList = QDir(parent->info.absoluteFilePath()).entryInfoList(nameFilters, QDir::AllEntries | QDir::System);
+        }
+    }
+
+    QVector<QDirNode> nodes(infoList.count());
+    for (int i = 0; i < infoList.count(); ++i) {
+        QDirNode &node = nodes[i];
+        node.parent = parent;
+        node.info = infoList.at(i);
+        node.populated = false;
+        node.stat = shouldStat;
+    }
+
+    return nodes;
+}
+
+void QDirModelPrivate::_q_refresh()
+{
+    Q_Q(QDirModel);
+    q->refresh(toBeRefreshed);
+    toBeRefreshed = QModelIndex();
+}
+
+void QDirModelPrivate::savePersistentIndexes()
+{
+    Q_Q(QDirModel);
+    savedPersistent.clear();
+    foreach (QPersistentModelIndexData *data, persistent.indexes) {
+        SavedPersistent saved;
+        QModelIndex index = data->index;
+        saved.path = q->filePath(index);
+        saved.column = index.column();
+        saved.data = data;
+        saved.index = index;
+        savedPersistent.append(saved);
+    }
+}
+
+void QDirModelPrivate::restorePersistentIndexes()
+{
+    Q_Q(QDirModel);
+    bool allow = allowAppendChild;
+    allowAppendChild = false;
+    for (int i = 0; i < savedPersistent.count(); ++i) {
+        QPersistentModelIndexData *data = savedPersistent.at(i).data;
+        QString path = savedPersistent.at(i).path;
+        int column = savedPersistent.at(i).column;
+        QModelIndex idx = q->index(path, column);
+        if (idx != data->index || data->model == 0) {
+            //data->model may be equal to 0 if the model is getting destroyed
+            persistent.indexes.remove(data->index);
+            data->index = idx;
+            data->model = q;
+            if (idx.isValid())
+                persistent.indexes.insert(idx, data);
+        }
+    }
+    savedPersistent.clear();
+    allowAppendChild = allow;
+}
+
+QFileInfoList QDirModelPrivate::entryInfoList(const QString &path) const
+{
+    const QDir dir(path);
+    return dir.entryInfoList(nameFilters, filters, sort);
+}
+
+QStringList QDirModelPrivate::entryList(const QString &path) const
+{
+    const QDir dir(path);
+    return dir.entryList(nameFilters, filters, sort);
+}
+
+QString QDirModelPrivate::name(const QModelIndex &index) const
+{
+    const QDirNode *n = node(index);
+    const QFileInfo info = n->info;
+    if (info.isRoot()) {
+        QString name = info.absoluteFilePath();
+#if defined(Q_OS_WIN) && !defined(Q_OS_WINCE)
+        if (name.startsWith(QLatin1Char('/'))) // UNC host
+            return info.fileName();
+        if (name.endsWith(QLatin1Char('/')))
+            name.chop(1);
+#endif
+        return name;
+    }
+    return info.fileName();
+}
+
+QString QDirModelPrivate::size(const QModelIndex &index) const
+{
+    const QDirNode *n = node(index);
+    if (n->info.isDir()) {
+#ifdef Q_OS_MAC
+        return QLatin1String("--");
+#else
+        return QLatin1String("");
+#endif
+    // Windows   - ""
+    // OS X      - "--"
+    // Konqueror - "4 KB"
+    // Nautilus  - "9 items" (the number of children)
+    }
+
+    // According to the Si standard KB is 1000 bytes, KiB is 1024
+    // but on windows sizes are calulated by dividing by 1024 so we do what they do.
+    const quint64 kb = 1024;
+    const quint64 mb = 1024 * kb;
+    const quint64 gb = 1024 * mb;
+    const quint64 tb = 1024 * gb;
+    quint64 bytes = n->info.size();
+    if (bytes >= tb)
+        return QLocale().toString(bytes / tb) + QString::fromLatin1(" TB");
+    if (bytes >= gb)
+        return QLocale().toString(bytes / gb) + QString::fromLatin1(" GB");
+    if (bytes >= mb)
+        return QLocale().toString(bytes / mb) + QString::fromLatin1(" MB");
+    if (bytes >= kb)
+        return QLocale().toString(bytes / kb) + QString::fromLatin1(" KB");
+    return QLocale().toString(bytes) + QString::fromLatin1(" bytes");
+}
+
+QString QDirModelPrivate::type(const QModelIndex &index) const
+{
+    return iconProvider->type(node(index)->info);
+}
+
+QString QDirModelPrivate::time(const QModelIndex &index) const
+{
+#ifndef QT_NO_DATESTRING
+    return node(index)->info.lastModified().toString(Qt::LocalDate);
+#else
+    Q_UNUSED(index);
+    return QString();
+#endif
+}
+
+void QDirModelPrivate::appendChild(QDirModelPrivate::QDirNode *parent, const QString &path) const
+{
+    QDirModelPrivate::QDirNode node;
+    node.populated = false;
+    node.stat = shouldStat;
+    node.parent = (parent == &root ? 0 : parent);
+    node.info = QFileInfo(path);
+    node.info.setCaching(true);
+
+    // The following append(node) may reallocate the vector, thus
+    // we need to update the pointers to the childnodes parent.
+    QDirModelPrivate *that = const_cast<QDirModelPrivate *>(this);
+    that->savePersistentIndexes();
+    parent->children.append(node);
+    for (int i = 0; i < parent->children.count(); ++i) {
+        QDirNode *childNode = &parent->children[i];
+        for (int j = 0; j < childNode->children.count(); ++j)
+            childNode->children[j].parent = childNode;
+    }
+    that->restorePersistentIndexes();
+}
+
+QFileInfo QDirModelPrivate::resolvedInfo(QFileInfo info)
+{
+#ifdef Q_OS_WIN
+    // On windows, we cannot create a shortcut to a shortcut.
+    return QFileInfo(info.symLinkTarget());
+#else
+    QStringList paths;
+    do {
+        QFileInfo link(info.symLinkTarget());
+        if (link.isRelative())
+            info.setFile(info.absolutePath(), link.filePath());
+        else
+            info = link;
+        if (paths.contains(info.absoluteFilePath()))
+            return QFileInfo();
+        paths.append(info.absoluteFilePath());
+    } while (info.isSymLink());
+    return info;
+#endif
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qdirmodel.cpp"
+
+#endif // QT_NO_DIRMODEL