qt5base-lts/examples/widgets/itemviews/storageview/storagemodel.cpp

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** Copyright (C) 2015 The Qt Company Ltd.
** Copyright (C) 2014 Ivan Komissarov
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#include "storagemodel.h"

#include <QDir>
#include <qmath.h>
#include <cmath>

static QString sizeToString(qint64 size)
{
    static const char *const strings[] = { "b", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };

    if (size <= 0)
        return StorageModel::tr("0 b");

    double power = std::log((double)size)/std::log(1024.0);
    int intPower = (int)power;
    intPower = intPower >= 8 ? 8 - 1 : intPower;

    double normSize = size / std::pow(1024.0, intPower);
    //: this should expand to "1.23 GB"
    return StorageModel::tr("%1 %2").arg(normSize, 0, 'f', intPower > 0 ? 2 : 0).arg(strings[intPower]);
}

StorageModel::StorageModel(QObject *parent) :
    QAbstractTableModel(parent),
    m_volumes(QStorageInfo::mountedVolumes())
{
}

int StorageModel::columnCount(const QModelIndex &/*parent*/) const
{
    return ColumnCount;
}

int StorageModel::rowCount(const QModelIndex &parent) const
{
    if (parent.isValid())
        return 0;
    return m_volumes.count();
}

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

    if (role == Qt::DisplayRole) {
        const QStorageInfo &volume = m_volumes.at(index.row());
        switch (index.column()) {
        case ColumnRootPath:
            return QDir::toNativeSeparators(volume.rootPath());
        case ColumnName:
            return volume.name();
        case ColumnDevice:
            return volume.device();
        case ColumnFileSystemName:
            return volume.fileSystemType();
        case ColumnTotal:
            return sizeToString(volume.bytesTotal());
        case ColumnFree:
            return sizeToString(volume.bytesFree());
        case ColumnAvailable:
            return sizeToString(volume.bytesAvailable());
        case ColumnIsReady:
            return volume.isReady();
        case ColumnIsReadOnly:
            return volume.isReadOnly();
        case ColumnIsValid:
            return volume.isValid();
        default:
            break;
        }
    } else if (role == Qt::ToolTipRole) {
        const QStorageInfo &volume = m_volumes.at(index.row());
        return tr("Root path : %1\n"
                  "Name: %2\n"
                  "Display Name: %3\n"
                  "Device: %4\n"
                  "FileSystem: %5\n"
                  "Total size: %6\n"
                  "Free size: %7\n"
                  "Available size: %8\n"
                  "Is Ready: %9\n"
                  "Is Read-only: %10\n"
                  "Is Valid: %11\n"
                  "Is Root: %12"
                  ).
                arg(QDir::toNativeSeparators(volume.rootPath())).
                arg(volume.name()).
                arg(volume.displayName()).
                arg(QString::fromUtf8(volume.device())).
                arg(QString::fromUtf8(volume.fileSystemType())).
                arg(sizeToString(volume.bytesTotal())).
                arg(sizeToString(volume.bytesFree())).
                arg(sizeToString(volume.bytesAvailable())).
                arg(volume.isReady() ? tr("true") : tr("false")).
                arg(volume.isReadOnly() ? tr("true") : tr("false")).
                arg(volume.isValid() ? tr("true") : tr("false")).
                arg(volume.isRoot() ? tr("true") : tr("false"));
    }
    return QVariant();
}

QVariant StorageModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (orientation != Qt::Horizontal)
        return QVariant();

    if (role != Qt::DisplayRole)
        return QVariant();

    switch (section) {
    case ColumnRootPath:
        return tr("Root path");
    case ColumnName:
        return tr("Volume Name");
    case ColumnDevice:
        return tr("Device");
    case ColumnFileSystemName:
        return tr("File system");
    case ColumnTotal:
        return tr("Total");
    case ColumnFree:
        return tr("Free");
    case ColumnAvailable:
        return tr("Available");
    case ColumnIsReady:
        return tr("Ready");
    case ColumnIsReadOnly:
        return tr("Read-only");
    case ColumnIsValid:
        return tr("Valid");
    default:
        break;
    }

    return QVariant();
}