filelistmodel.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation ([email protected])
 **
 ** This file is part of the examples 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 Nokia Corporation 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 "filelistmodel.h"
 #include <QApplication>
 #include <QPalette>
 #include <QBrush>
 #include <QDir>

 FileListModel::FileListModel(QObject *parent)
     : QAbstractListModel(parent)
 {
 }

 int FileListModel::rowCount(const QModelIndex & /* parent */) const
 {
     return fileCount;
 }

 QVariant FileListModel::data(const QModelIndex &index, int role) const
 {
     if (!index.isValid())
         return QVariant();

     if (index.row() >= fileList.size() || index.row() < 0)
         return QVariant();

     if (role == Qt::DisplayRole)
         return fileList.at(index.row());
     else if (role == Qt::BackgroundRole) {
         int batch = (index.row() / 100) % 2;
         if (batch == 0)
             return qApp->palette().base();
         else
             return qApp->palette().alternateBase();
     }
     return QVariant();
 }

 bool FileListModel::canFetchMore(const QModelIndex & /* index */) const
 {
     if (fileCount < fileList.size())
         return true;
     else
         return false;
 }

 void FileListModel::fetchMore(const QModelIndex & /* index */)
 {
     int remainder = fileList.size() - fileCount;
     int itemsToFetch = qMin(100, remainder);

     beginInsertRows(QModelIndex(), fileCount, fileCount+itemsToFetch-1);

     fileCount += itemsToFetch;

     endInsertRows();

     emit numberPopulated(itemsToFetch);
 }

 void FileListModel::setDirPath(const QString &path)
 {
     QDir dir(path);

     fileList = dir.entryList();
     fileCount = 0;
     reset();
 }