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#include "filelistmodel.h"

#include <QApplication>

#include <QPalette>

#include <QBrush>

#include <QDir>

FileListModel::FileListModel(QObject *parent)

    : QAbstractListModel(parent)

{

}

//![4]

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();

}

//![4]

//![1]

bool FileListModel::canFetchMore(const QModelIndex & /* index */) const

{

    if (fileCount < fileList.size())

        return true;

    else

        return false;

}

//![1]

//![2]

void FileListModel::fetchMore(const QModelIndex & /* index */)

{

    int remainder = fileList.size() - fileCount;

    int itemsToFetch = qMin(100, remainder);

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

    fileCount += itemsToFetch;

    endInsertRows();

    emit numberPopulated(itemsToFetch);

}

//![2]

//![0]

void FileListModel::setDirPath(const QString &path)

{

    QDir dir(path);

    fileList = dir.entryList();

    fileCount = 0;

    reset();

}

//![0]