Add the StorageView example

The StorageView example demonstrates the QStorageInfo API.

Change-Id: Ifaabadbe64fdf26d13a4ce4690e6b54514667c9f
Reviewed-by: Ivan Komissarov <ABBAPOH@gmail.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

examples/widgets/itemviews/itemviews.pro

@@ -17,5 +17,6 @@ SUBDIRS       = addressbook \
                 simplewidgetmapper \
                 spinboxdelegate \
                 spreadsheet \
-                stardelegate
+                stardelegate \
+                storageview
 contains(DEFINES, QT_NO_DRAGANDDROP): SUBDIRS -= puzzle

examples/widgets/itemviews/storageview/main.cpp

+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Ivan Komissarov
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia Plc 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 <QtWidgets/QApplication>
+#include <QtWidgets/QHeaderView>
+#include <QtWidgets/QTreeView>
+
+#include "storagemodel.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+
+    QTreeView view;
+    view.setModel(new StorageModel(&view));
+    view.resize(640, 480);
+    view.setSelectionBehavior(QAbstractItemView::SelectRows);
+    int columnCount = view.model()->columnCount();
+    for (int c = 0; c < columnCount; ++c)
+        view.resizeColumnToContents(c);
+    view.show();
+
+    return a.exec();
+}

examples/widgets/itemviews/storageview/storagemodel.cpp

+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Ivan Komissarov
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia Plc 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 "storagemodel.h"
+
+#include <QDir>
+#include <qmath.h>
+
+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 = log((double)size)/log(1024.0);
+    int intPower = (int)power;
+    intPower = intPower >= 8 ? 8 - 1 : intPower;
+
+    double normSize = size / 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();
+}

examples/widgets/itemviews/storageview/storagemodel.h

+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Ivan Komissarov
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia Plc 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef STORAGEMODEL_H
+#define STORAGEMODEL_H
+
+#include <QAbstractTableModel>
+#include <QStorageInfo>
+
+class StorageModel : public QAbstractTableModel
+{
+    Q_OBJECT
+    Q_DISABLE_COPY(StorageModel)
+public:
+    enum Column {
+        ColumnRootPath = 0,
+        ColumnName,
+        ColumnDevice,
+        ColumnFileSystemName,
+        ColumnTotal,
+        ColumnFree,
+        ColumnAvailable,
+        ColumnIsReady,
+        ColumnIsReadOnly,
+        ColumnIsValid,
+        ColumnCount
+    };
+
+    explicit StorageModel(QObject *parent = 0);
+
+    int columnCount(const QModelIndex &parent) const;
+    int rowCount(const QModelIndex &parent) const;
+
+    QVariant data(const QModelIndex &index, int role) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
+
+private:
+    QList<QStorageInfo> m_volumes;
+};
+
+#endif // STORAGEMODEL_H

examples/widgets/itemviews/storageview/storageview.pro

+QT += core gui widgets
+TARGET = storageview
+TEMPLATE = app
+SOURCES += storagemodel.cpp \
+    main.cpp
+HEADERS += \
+    storagemodel.h