Add mime type browser example.

Add an example showing the types in QMimeDatabase in
a QTreeView with detailed information on click.
The example has menu options to detect a file type
and search by name.

Change-Id: If6f1a6661edd100a54460a49562a8a8667245ddb
Reviewed-by: David Faure <david.faure@kdab.com>

examples/corelib/corelib.pro

@@ -4,5 +4,6 @@ CONFIG += no_docs_target
 SUBDIRS = \
     ipc \
     json \
+    mimetypes \
     threads \
     tools

examples/corelib/mimetypes/mimetypebrowser/main.cpp

@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** 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 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 "mainwindow.h"
+
+#include <QApplication>
+#include <QDesktopWidget>
+
+#include <QCommandLineParser>
+#include <QCommandLineOption>
+#include <QDebug>
+#include <QMimeDatabase>
+#include <QMimeType>
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
+
+    QCommandLineParser parser;
+    parser.addHelpOption();
+    parser.addVersionOption();
+
+    parser.process(app);
+
+    MainWindow mainWindow;
+    const QRect availableGeometry = QApplication::desktop()->availableGeometry(&mainWindow);
+    mainWindow.resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
+    mainWindow.show();
+
+    return app.exec();
+}

examples/corelib/mimetypes/mimetypebrowser/mainwindow.cpp

@@ -0,0 +1,185 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** 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 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 "mainwindow.h"
+#include "mimetypemodel.h"
+
+#include <QAction>
+#include <QApplication>
+#include <QFileDialog>
+#include <QInputDialog>
+#include <QMenu>
+#include <QMenuBar>
+#include <QMessageBox>
+#include <QPlainTextEdit>
+#include <QSplitter>
+#include <QStatusBar>
+#include <QTextEdit>
+#include <QTreeView>
+
+#include <QFileInfo>
+#include <QItemSelectionModel>
+#include <QMimeDatabase>
+#include <QMimeType>
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , m_model(new MimetypeModel(this))
+    , m_treeView(new QTreeView)
+    , m_detailsText(new QTextEdit)
+    , m_findIndex(0)
+{
+    setWindowTitle(tr("Qt Mime Database Browser"));
+
+    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
+    QAction *detectFileAction =
+        fileMenu->addAction(tr("&Detect File Type..."), this, &MainWindow::detectFile);
+    detectFileAction->setShortcuts(QKeySequence::Open);
+
+    QAction *exitAction = fileMenu->addAction(tr("E&xit"), qApp, &QApplication::closeAllWindows);
+    exitAction->setShortcuts(QKeySequence::Quit);
+
+    QMenu *findMenu = menuBar()->addMenu(tr("&Edit"));
+    QAction *findAction =
+        findMenu->addAction(tr("&Find..."), this, &MainWindow::find);
+    findAction->setShortcuts(QKeySequence::Find);
+    m_findNextAction = findMenu->addAction(tr("Find &Next"), this, &MainWindow::findNext);
+    m_findNextAction->setShortcuts(QKeySequence::FindNext);
+    m_findPreviousAction = findMenu->addAction(tr("Find &Previous"), this, &MainWindow::findPrevious);
+    m_findPreviousAction->setShortcuts(QKeySequence::FindPrevious);
+
+    menuBar()->addMenu(tr("&About"))->addAction(tr("&About Qt"), qApp, &QApplication::aboutQt);
+
+    QSplitter *centralSplitter = new QSplitter;
+    setCentralWidget(centralSplitter);
+    m_treeView = new QTreeView;
+    m_treeView->setUniformRowHeights(true);
+    m_treeView->setModel(m_model);
+
+    const auto items = m_model->findItems("application/octet-stream", Qt::MatchContains | Qt::MatchFixedString | Qt::MatchRecursive);
+    if (!items.isEmpty())
+        m_treeView->expand(m_model->indexFromItem(items.constFirst()));
+
+    connect(m_treeView->selectionModel(), &QItemSelectionModel::currentChanged,
+            this, &MainWindow::currentChanged);
+    centralSplitter->addWidget(m_treeView);
+    m_detailsText->setReadOnly(true);
+    centralSplitter->addWidget(m_detailsText);
+
+    updateFindActions();
+}
+
+void MainWindow::currentChanged(const QModelIndex &index)
+{
+    if (index.isValid())
+        m_detailsText->setText(MimetypeModel::formatMimeTypeInfo(m_model->mimeType(index)));
+    else
+        m_detailsText->clear();
+}
+
+void MainWindow::selectAndGoTo(const QModelIndex &index)
+{
+    m_treeView->scrollTo(index, QAbstractItemView::PositionAtCenter);
+    m_treeView->setCurrentIndex(index);
+}
+
+void MainWindow::detectFile()
+{
+    const QString fileName = QFileDialog::getOpenFileName(this, tr("Choose File"));
+    if (fileName.isEmpty())
+        return;
+    QMimeDatabase mimeDatabase;
+    const QFileInfo fi(fileName);
+    const QMimeType mimeType = mimeDatabase.mimeTypeForFile(fi);
+    const QModelIndex index = mimeType.isValid()
+        ? m_model->indexForMimeType(mimeType.name()) : QModelIndex();
+    if (index.isValid()) {
+        statusBar()->showMessage(tr("\"%1\" is of type \"%2\"").arg(fi.fileName(), mimeType.name()));
+        selectAndGoTo(index);
+    } else {
+        QMessageBox::information(this, tr("Unknown File Type"),
+                                 tr("The type of %1 could not be determined.")
+                                 .arg(QDir::toNativeSeparators(fileName)));
+    }
+}
+
+void MainWindow::updateFindActions()
+{
+    const bool findNextPreviousEnabled = m_findMatches.size() > 1;
+    m_findNextAction->setEnabled(findNextPreviousEnabled);
+    m_findPreviousAction->setEnabled(findNextPreviousEnabled);
+}
+
+void MainWindow::findPrevious()
+{
+    if (--m_findIndex < 0)
+        m_findIndex = m_findMatches.size() - 1;
+    if (m_findIndex >= 0)
+        selectAndGoTo(m_findMatches.at(m_findIndex));
+}
+
+void MainWindow::findNext()
+{
+    if (++m_findIndex >= m_findMatches.size())
+        m_findIndex = 0;
+    if (m_findIndex < m_findMatches.size())
+        selectAndGoTo(m_findMatches.at(m_findIndex));
+}
+
+void MainWindow::find()
+{
+    QInputDialog inputDialog(this);
+    inputDialog.setWindowTitle(tr("Find"));
+    inputDialog.setLabelText(tr("Text:"));
+    if (inputDialog.exec() != QDialog::Accepted)
+        return;
+    const QString value = inputDialog.textValue().trimmed();
+    if (value.isEmpty())
+        return;
+
+    m_findMatches.clear();
+    m_findIndex = 0;
+    foreach (const QStandardItem *item, m_model->findItems(value, Qt::MatchContains | Qt::MatchFixedString | Qt::MatchRecursive))
+        m_findMatches.append(m_model->indexFromItem(item));
+    statusBar()->showMessage(tr("%n mime types match \"%1\".", 0, m_findMatches.size()).arg(value));
+    updateFindActions();
+    if (!m_findMatches.isEmpty())
+        selectAndGoTo(m_findMatches.constFirst());
+}

examples/corelib/mimetypes/mimetypebrowser/mainwindow.h

@@ -0,0 +1,79 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** 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 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QModelIndexList>
+
+QT_FORWARD_DECLARE_CLASS(QAction)
+QT_FORWARD_DECLARE_CLASS(QTextEdit)
+QT_FORWARD_DECLARE_CLASS(QTreeView)
+
+class MimetypeModel;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+
+private slots:
+    void currentChanged(const QModelIndex &);
+    void detectFile();
+    void find();
+    void findNext();
+    void findPrevious();
+
+private:
+    void selectAndGoTo(const QModelIndex &index);
+    void updateFindActions();
+
+    MimetypeModel *m_model;
+    QTreeView *m_treeView;
+    QTextEdit *m_detailsText;
+    QAction *m_findNextAction;
+    QAction *m_findPreviousAction;
+    QModelIndexList m_findMatches;
+    int m_findIndex;
+};
+
+#endif // MAINWINDOW_H

examples/corelib/mimetypes/mimetypebrowser/mimetypebrowser.pro

@@ -0,0 +1,13 @@
+TEMPLATE = app
+QT += widgets
+CONFIG -= app_bundle
+CONFIG += c++11
+
+SOURCES += \
+    main.cpp \
+    mimetypemodel.cpp \
+    mainwindow.cpp
+
+HEADERS += \
+    mimetypemodel.h \
+    mainwindow.h

examples/corelib/mimetypes/mimetypebrowser/mimetypemodel.cpp

@@ -0,0 +1,199 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** 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 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 "mimetypemodel.h"
+
+#include <QIcon>
+
+#include <QDebug>
+#include <QMimeDatabase>
+#include <QTextStream>
+#include <QVariant>
+
+#include <algorithm>
+
+Q_DECLARE_METATYPE(QMimeType)
+
+typedef QList<QStandardItem *> StandardItemList;
+
+enum { mimeTypeRole = Qt::UserRole + 1, iconQueriedRole = Qt::UserRole + 2 };
+
+bool operator<(const QMimeType &t1, const QMimeType &t2)
+{
+    return t1.name() < t2.name();
+}
+
+static StandardItemList createRow(const QMimeType &t)
+{
+    const QVariant v = QVariant::fromValue(t);
+    QStandardItem *nameItem = new QStandardItem(t.name());
+    const Qt::ItemFlags flags = Qt::ItemIsSelectable | Qt::ItemIsEnabled;
+    nameItem->setData(v, mimeTypeRole);
+    nameItem->setData(QVariant(false), iconQueriedRole);
+    nameItem->setFlags(flags);
+    nameItem->setToolTip(t.comment());
+    return StandardItemList{nameItem};
+}
+
+MimetypeModel::MimetypeModel(QObject *parent)
+    : QStandardItemModel(0, ColumnCount, parent)
+{
+    setHorizontalHeaderLabels(QStringList{tr("Name")});
+    populate();
+}
+
+QVariant MimetypeModel::data(const QModelIndex &index, int role) const
+{
+    if (role != Qt::DecorationRole || !index.isValid() || index.data(iconQueriedRole).toBool())
+        return QStandardItemModel::data(index, role);
+    QStandardItem *item = itemFromIndex(index);
+    const QString iconName = item->data(mimeTypeRole).value<QMimeType>().iconName();
+    if (!iconName.isEmpty())
+        item->setIcon(QIcon::fromTheme(iconName));
+    item->setData(QVariant(true), iconQueriedRole);
+    return item->icon();
+}
+
+QMimeType MimetypeModel::mimeType(const QModelIndex &index) const
+{
+    return index.data(mimeTypeRole).value<QMimeType>();
+}
+
+void MimetypeModel::populate()
+{
+    typedef QList<QMimeType>::Iterator Iterator;
+
+    QMimeDatabase mimeDatabase;
+    QList<QMimeType> allTypes = mimeDatabase.allMimeTypes();
+
+    // Move top level types to rear end of list, sort this partition,
+    // create top level items and truncate the list.
+    Iterator end = allTypes.end();
+    const Iterator topLevelStart =
+        std::stable_partition(allTypes.begin(), end,
+                              [](const QMimeType &t) { return !t.parentMimeTypes().isEmpty(); });
+    std::stable_sort(topLevelStart, end);
+    for (Iterator it = topLevelStart; it != end; ++it) {
+        const StandardItemList row = createRow(*it);
+        appendRow(row);
+        m_nameIndexHash.insert(it->name(), indexFromItem(row.constFirst()));
+    }
+    allTypes.erase(topLevelStart, end);
+
+    while (!allTypes.isEmpty()) {
+        // Find a type inheriting one that is already in the model.
+        end = allTypes.end();
+        auto nameIndexIt = m_nameIndexHash.constEnd();
+        for (Iterator it = allTypes.begin(); it != end; ++it) {
+            nameIndexIt = m_nameIndexHash.constFind(it->parentMimeTypes().constFirst());
+            if (nameIndexIt != m_nameIndexHash.constEnd())
+                break;
+        }
+        if (nameIndexIt == m_nameIndexHash.constEnd()) {
+            qWarning() << "Orphaned mime types:" << allTypes;
+            break;
+        }
+
+        // Move types inheriting the parent type to rear end of list, sort this partition,
+        // append the items to parent and truncate the list.
+        const QString &parentName = nameIndexIt.key();
+        const Iterator start =
+            std::stable_partition(allTypes.begin(), end,
+                                  [parentName](const QMimeType &t) { return !t.inherits(parentName); });
+        std::stable_sort(start, end);
+        QStandardItem *parentItem = itemFromIndex(nameIndexIt.value());
+        for (Iterator it = start; it != end; ++it) {
+            const StandardItemList row = createRow(*it);
+            parentItem->appendRow(row);
+            m_nameIndexHash.insert(it->name(), indexFromItem(row.constFirst()));
+        }
+        allTypes.erase(start, end);
+    }
+}
+
+QTextStream &operator<<(QTextStream &stream, const QStringList &list)
+{
+    for (int i = 0, size = list.size(); i < size; ++i) {
+        if (i)
+            stream << ", ";
+        stream << list.at(i);
+    }
+    return stream;
+}
+
+QString MimetypeModel::formatMimeTypeInfo(const QMimeType &t)
+{
+    QString result;
+    QTextStream str(&result);
+    str << "<html><head/><body><h3><center>" << t.name() << "</center></h3><br><table>";
+
+    const QStringList &aliases = t.aliases();
+    if (!aliases.isEmpty())
+        str << "<tr><td>Aliases:</td><td>" << " (" << aliases << ')';
+
+    str << "</td></tr>"
+        << "<tr><td>Comment:</td><td>" << t.comment() << "</td></tr>"
+        << "<tr><td>Icon name:</td><td>" << t.iconName() << "</td></tr>";
+
+    const QString &filter = t.filterString();
+    if (!filter.isEmpty())
+        str << "<tr><td>Filter:</td><td>" << t.filterString() << "</td></tr>";
+
+    const QStringList &patterns = t.globPatterns();
+    if (!patterns.isEmpty())
+        str << "<tr><td>Glob patterns:</td><td>" << patterns << "</td></tr>";
+
+    const QStringList &parentMimeTypes = t.parentMimeTypes();
+    if (!parentMimeTypes.isEmpty())
+        str << "<tr><td>Parent types:</td><td>" << t.parentMimeTypes() << "</td></tr>";
+
+    QStringList suffixes = t.suffixes();
+    if (!suffixes.isEmpty()) {
+        str << "<tr><td>Suffixes:</td><td>";
+        const QString &preferredSuffix = t.preferredSuffix();
+        if (!preferredSuffix.isEmpty()) {
+            suffixes.removeOne(preferredSuffix);
+            str << "<b>" << preferredSuffix << "</b> ";
+        }
+        str << suffixes << "</td></tr>";
+    }
+    str << "</table></body></html>";
+    return result;
+}

examples/corelib/mimetypes/mimetypebrowser/mimetypemodel.h

@@ -0,0 +1,74 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** 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 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MIMETYPEMODEL_H
+#define MIMETYPEMODEL_H
+
+#include <QStandardItemModel>
+#include <QHash>
+
+QT_FORWARD_DECLARE_CLASS(QMimeType)
+
+class MimetypeModel : public QStandardItemModel
+{
+    Q_OBJECT
+public:
+    enum Columns { NameColumn, ColumnCount };
+
+    explicit MimetypeModel(QObject *parent = nullptr);
+
+    QVariant data(const QModelIndex &index, int role) const override;
+
+    QMimeType mimeType(const QModelIndex &) const;
+
+    QModelIndex indexForMimeType(const QString &name) const
+    { return m_nameIndexHash.value(name); }
+
+    static QString formatMimeTypeInfo(const QMimeType &);
+
+private:
+    typedef QHash<QString, QModelIndex> NameIndexHash;
+
+    void populate();
+
+    NameIndexHash m_nameIndexHash;
+};
+
+#endif // MIMETYPEMODEL_H

examples/corelib/mimetypes/mimetypes.pro

@@ -0,0 +1,3 @@
+TEMPLATE = subdirs
+
+SUBDIRS = mimetypebrowser