filelistmodel.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, 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 The Qt Company Ltd 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 <QBrush>
  #include <QDir>
  #include <QPalette>

  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);

      beginResetModel();
      fileList = dir.entryList();
      fileCount = 0;
      endResetModel();
  }