- Qt 5.5
- Qt WebEngine Widgets
- WebEngine Tab Browser Example
- history.cpp Example File
- Qt 5.5.1 Reference Documentation

# history.cpp Example File

browser/history.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the demonstration applications of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL$
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    ** accordance with the commercial license agreement provided with the
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    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.LGPL included in the
    ** packaging of this file. Please review the following information to
    ** ensure the GNU Lesser General Public License version 2.1 requirements
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    ** rights. These rights are described in The Qt Company LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** GNU General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU
    ** General Public License version 3.0 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file. Please review the following information to
    ** ensure the GNU General Public License version 3.0 requirements will be
    ** met: http://www.gnu.org/copyleft/gpl.html.
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    ****************************************************************************/

    #include "history.h"

    #include "autosaver.h"
    #include "browserapplication.h"

    #include <QtCore/QBuffer>
    #include <QtCore/QDir>
    #include <QtCore/QFile>
    #include <QtCore/QFileInfo>
    #include <QtCore/QSettings>
    #include <QtCore/QTemporaryFile>
    #include <QtCore/QTextStream>

    #include <QtCore/QtAlgorithms>

    #include <QtGui/QClipboard>
    #include <QtGui/QDesktopServices>
    #include <QtWidgets/QHeaderView>
    #include <QtWidgets/QStyle>

    #include <QWebEngineSettings>

    #include <QtCore/QDebug>

    static const unsigned int HISTORY_VERSION = 23;

    HistoryManager::HistoryManager(QObject *parent)
        : QObject(parent)
        , m_saveTimer(new AutoSaver(this))
        , m_historyLimit(30)
        , m_historyModel(0)
        , m_historyFilterModel(0)
        , m_historyTreeModel(0)
    {
        m_expiredTimer.setSingleShot(true);
        connect(&m_expiredTimer, SIGNAL(timeout()),
                this, SLOT(checkForExpired()));
        connect(this, SIGNAL(entryAdded(HistoryItem)),
                m_saveTimer, SLOT(changeOccurred()));
        connect(this, SIGNAL(entryRemoved(HistoryItem)),
                m_saveTimer, SLOT(changeOccurred()));
        load();

        m_historyModel = new HistoryModel(this, this);
        m_historyFilterModel = new HistoryFilterModel(m_historyModel, this);
        m_historyTreeModel = new HistoryTreeModel(m_historyFilterModel, this);
    }

    HistoryManager::~HistoryManager()
    {
        m_saveTimer->saveIfNeccessary();
    }

    QList<HistoryItem> HistoryManager::history() const
    {
        return m_history;
    }

    bool HistoryManager::historyContains(const QString &url) const
    {
        return m_historyFilterModel->historyContains(url);
    }

    void HistoryManager::addHistoryEntry(const QString &url)
    {
        QUrl cleanUrl(url);
        cleanUrl.setPassword(QString());
        cleanUrl.setHost(cleanUrl.host().toLower());
        HistoryItem item(cleanUrl.toString(), QDateTime::currentDateTime());
        addHistoryItem(item);
    }

    void HistoryManager::setHistory(const QList<HistoryItem> &history, bool loadedAndSorted)
    {
        m_history = history;

        // verify that it is sorted by date
        if (!loadedAndSorted)
            qSort(m_history.begin(), m_history.end());

        checkForExpired();

        if (loadedAndSorted) {
            m_lastSavedUrl = m_history.value(0).url;
        } else {
            m_lastSavedUrl = QString();
            m_saveTimer->changeOccurred();
        }
        emit historyReset();
    }

    HistoryModel *HistoryManager::historyModel() const
    {
        return m_historyModel;
    }

    HistoryFilterModel *HistoryManager::historyFilterModel() const
    {
        return m_historyFilterModel;
    }

    HistoryTreeModel *HistoryManager::historyTreeModel() const
    {
        return m_historyTreeModel;
    }

    void HistoryManager::checkForExpired()
    {
        if (m_historyLimit < 0 || m_history.isEmpty())
            return;

        QDateTime now = QDateTime::currentDateTime();
        int nextTimeout = 0;

        while (!m_history.isEmpty()) {
            QDateTime checkForExpired = m_history.last().dateTime;
            checkForExpired.setDate(checkForExpired.date().addDays(m_historyLimit));
            if (now.daysTo(checkForExpired) > 7) {
                // check at most in a week to prevent int overflows on the timer
                nextTimeout = 7 * 86400;
            } else {
                nextTimeout = now.secsTo(checkForExpired);
            }
            if (nextTimeout > 0)
                break;
            HistoryItem item = m_history.takeLast();
            // remove from saved file also
            m_lastSavedUrl = QString();
            emit entryRemoved(item);
        }

        if (nextTimeout > 0)
            m_expiredTimer.start(nextTimeout * 1000);
    }

    void HistoryManager::addHistoryItem(const HistoryItem &item)
    {
        if (BrowserApplication::instance()->privateBrowsing())
            return;

        m_history.prepend(item);
        emit entryAdded(item);
        if (m_history.count() == 1)
            checkForExpired();
    }

    void HistoryManager::updateHistoryItem(const QUrl &url, const QString &title)
    {
        for (int i = 0; i < m_history.count(); ++i) {
            if (url == m_history.at(i).url) {
                m_history[i].title = title;
                m_saveTimer->changeOccurred();
                if (m_lastSavedUrl.isEmpty())
                    m_lastSavedUrl = m_history.at(i).url;
                emit entryUpdated(i);
                break;
            }
        }
    }

    int HistoryManager::historyLimit() const
    {
        return m_historyLimit;
    }

    void HistoryManager::setHistoryLimit(int limit)
    {
        if (m_historyLimit == limit)
            return;
        m_historyLimit = limit;
        checkForExpired();
        m_saveTimer->changeOccurred();
    }

    void HistoryManager::clear()
    {
        m_history.clear();
        m_lastSavedUrl = QString();
        m_saveTimer->changeOccurred();
        m_saveTimer->saveIfNeccessary();
        historyReset();
    }

    void HistoryManager::loadSettings()
    {
        // load settings
        QSettings settings;
        settings.beginGroup(QLatin1String("history"));
        m_historyLimit = settings.value(QLatin1String("historyLimit"), 30).toInt();
    }

    void HistoryManager::load()
    {
        loadSettings();

        QFile historyFile(QStandardPaths::writableLocation(QStandardPaths::DataLocation)
            + QLatin1String("/history"));
        if (!historyFile.exists())
            return;
        if (!historyFile.open(QFile::ReadOnly)) {
            qWarning() << "Unable to open history file" << historyFile.fileName();
            return;
        }

        QList<HistoryItem> list;
        QDataStream in(&historyFile);
        // Double check that the history file is sorted as it is read in
        bool needToSort = false;
        HistoryItem lastInsertedItem;
        QByteArray data;
        QDataStream stream;
        QBuffer buffer;
        stream.setDevice(&buffer);
        while (!historyFile.atEnd()) {
            in >> data;
            buffer.close();
            buffer.setBuffer(&data);
            buffer.open(QIODevice::ReadOnly);
            quint32 ver;
            stream >> ver;
            if (ver != HISTORY_VERSION)
                continue;
            HistoryItem item;
            stream >> item.url;
            stream >> item.dateTime;
            stream >> item.title;

            if (!item.dateTime.isValid())
                continue;

            if (item == lastInsertedItem) {
                if (lastInsertedItem.title.isEmpty() && !list.isEmpty())
                    list[0].title = item.title;
                continue;
            }

            if (!needToSort && !list.isEmpty() && lastInsertedItem < item)
                needToSort = true;

            list.prepend(item);
            lastInsertedItem = item;
        }
        if (needToSort)
            qSort(list.begin(), list.end());

        setHistory(list, true);

        // If we had to sort re-write the whole history sorted
        if (needToSort) {
            m_lastSavedUrl = QString();
            m_saveTimer->changeOccurred();
        }
    }

    void HistoryManager::save()
    {
        QSettings settings;
        settings.beginGroup(QLatin1String("history"));
        settings.setValue(QLatin1String("historyLimit"), m_historyLimit);

        bool saveAll = m_lastSavedUrl.isEmpty();
        int first = m_history.count() - 1;
        if (!saveAll) {
            // find the first one to save
            for (int i = 0; i < m_history.count(); ++i) {
                if (m_history.at(i).url == m_lastSavedUrl) {
                    first = i - 1;
                    break;
                }
            }
        }
        if (first == m_history.count() - 1)
            saveAll = true;

        QString directory = QStandardPaths::writableLocation(QStandardPaths::DataLocation);
        if (directory.isEmpty())
            directory = QDir::homePath() + QLatin1String("/.") + QCoreApplication::applicationName();
        if (!QFile::exists(directory)) {
            QDir dir;
            dir.mkpath(directory);
        }

        QFile historyFile(directory + QLatin1String("/history"));
        // When saving everything use a temporary file to prevent possible data loss.
        QTemporaryFile tempFile;
        tempFile.setAutoRemove(false);
        bool open = false;
        if (saveAll) {
            open = tempFile.open();
        } else {
            open = historyFile.open(QFile::Append);
        }

        if (!open) {
            qWarning() << "Unable to open history file for saving"
                       << (saveAll ? tempFile.fileName() : historyFile.fileName());
            return;
        }

        QDataStream out(saveAll ? &tempFile : &historyFile);
        for (int i = first; i >= 0; --i) {
            QByteArray data;
            QDataStream stream(&data, QIODevice::WriteOnly);
            HistoryItem item = m_history.at(i);
            stream << HISTORY_VERSION << item.url << item.dateTime << item.title;
            out << data;
        }
        tempFile.close();

        if (saveAll) {
            if (historyFile.exists() && !historyFile.remove())
                qWarning() << "History: error removing old history." << historyFile.errorString();
            if (!tempFile.rename(historyFile.fileName()))
                qWarning() << "History: error moving new history over old." << tempFile.errorString() << historyFile.fileName();
        }
        m_lastSavedUrl = m_history.value(0).url;
    }

    HistoryModel::HistoryModel(HistoryManager *history, QObject *parent)
        : QAbstractTableModel(parent)
        , m_history(history)
    {
        Q_ASSERT(m_history);
        connect(m_history, SIGNAL(historyReset()),
                this, SLOT(historyReset()));
        connect(m_history, SIGNAL(entryRemoved(HistoryItem)),
                this, SLOT(historyReset()));

        connect(m_history, SIGNAL(entryAdded(HistoryItem)),
                this, SLOT(entryAdded()));
        connect(m_history, SIGNAL(entryUpdated(int)),
                this, SLOT(entryUpdated(int)));
    }

    void HistoryModel::historyReset()
    {
        beginResetModel();
        endResetModel();
    }

    void HistoryModel::entryAdded()
    {
        beginInsertRows(QModelIndex(), 0, 0);
        endInsertRows();
    }

    void HistoryModel::entryUpdated(int offset)
    {
        QModelIndex idx = index(offset, 0);
        emit dataChanged(idx, idx);
    }

    QVariant HistoryModel::headerData(int section, Qt::Orientation orientation, int role) const
    {
        if (orientation == Qt::Horizontal
            && role == Qt::DisplayRole) {
            switch (section) {
                case 0: return tr("Title");
                case 1: return tr("Address");
            }
        }
        return QAbstractTableModel::headerData(section, orientation, role);
    }

    QVariant HistoryModel::data(const QModelIndex &index, int role) const
    {
        QList<HistoryItem> lst = m_history->history();
        if (index.row() < 0 || index.row() >= lst.size())
            return QVariant();

        const HistoryItem &item = lst.at(index.row());
        switch (role) {
        case DateTimeRole:
            return item.dateTime;
        case DateRole:
            return item.dateTime.date();
        case UrlRole:
            return QUrl(item.url);
        case UrlStringRole:
            return item.url;
        case Qt::DisplayRole:
        case Qt::EditRole: {
            switch (index.column()) {
                case 0:
                    // when there is no title try to generate one from the url
                    if (item.title.isEmpty()) {
                        QString page = QFileInfo(QUrl(item.url).path()).fileName();
                        if (!page.isEmpty())
                            return page;
                        return item.url;
                    }
                    return item.title;
                case 1:
                    return item.url;
            }
            }
        case Qt::DecorationRole:
            if (index.column() == 0) {
                return BrowserApplication::instance()->icon(item.url);
            }
        }
        return QVariant();
    }

    int HistoryModel::columnCount(const QModelIndex &parent) const
    {
        return (parent.isValid()) ? 0 : 2;
    }

    int HistoryModel::rowCount(const QModelIndex &parent) const
    {
        return (parent.isValid()) ? 0 : m_history->history().count();
    }

    bool HistoryModel::removeRows(int row, int count, const QModelIndex &parent)
    {
        if (parent.isValid())
            return false;
        int lastRow = row + count - 1;
        beginRemoveRows(parent, row, lastRow);
        QList<HistoryItem> lst = m_history->history();
        for (int i = lastRow; i >= row; --i)
            lst.removeAt(i);
        disconnect(m_history, SIGNAL(historyReset()), this, SLOT(historyReset()));
        m_history->setHistory(lst);
        connect(m_history, SIGNAL(historyReset()), this, SLOT(historyReset()));
        endRemoveRows();
        return true;
    }

    #define MOVEDROWS 15

    /*
        Maps the first bunch of items of the source model to the root
    */
    HistoryMenuModel::HistoryMenuModel(HistoryTreeModel *sourceModel, QObject *parent)
        : QAbstractProxyModel(parent)
        , m_treeModel(sourceModel)
    {
        setSourceModel(sourceModel);
    }

    int HistoryMenuModel::bumpedRows() const
    {
        QModelIndex first = m_treeModel->index(0, 0);
        if (!first.isValid())
            return 0;
        return qMin(m_treeModel->rowCount(first), MOVEDROWS);
    }

    int HistoryMenuModel::columnCount(const QModelIndex &parent) const
    {
        return m_treeModel->columnCount(mapToSource(parent));
    }

    int HistoryMenuModel::rowCount(const QModelIndex &parent) const
    {
        if (parent.column() > 0)
            return 0;

        if (!parent.isValid()) {
            int folders = sourceModel()->rowCount();
            int bumpedItems = bumpedRows();
            if (bumpedItems <= MOVEDROWS
                && bumpedItems == sourceModel()->rowCount(sourceModel()->index(0, 0)))
                --folders;
            return bumpedItems + folders;
        }

        if (parent.internalId() == quintptr(-1)) {
            if (parent.row() < bumpedRows())
                return 0;
        }

        QModelIndex idx = mapToSource(parent);
        int defaultCount = sourceModel()->rowCount(idx);
        if (idx == sourceModel()->index(0, 0))
            return defaultCount - bumpedRows();
        return defaultCount;
    }

    QModelIndex HistoryMenuModel::mapFromSource(const QModelIndex &sourceIndex) const
    {
        // currently not used or autotested
        Q_ASSERT(false);
        int sr = m_treeModel->mapToSource(sourceIndex).row();
        return createIndex(sourceIndex.row(), sourceIndex.column(), sr);
    }

    QModelIndex HistoryMenuModel::mapToSource(const QModelIndex &proxyIndex) const
    {
        if (!proxyIndex.isValid())
            return QModelIndex();

        if (proxyIndex.internalId() == quintptr(-1)) {
            int bumpedItems = bumpedRows();
            if (proxyIndex.row() < bumpedItems)
                return m_treeModel->index(proxyIndex.row(), proxyIndex.column(), m_treeModel->index(0, 0));
            if (bumpedItems <= MOVEDROWS && bumpedItems == sourceModel()->rowCount(m_treeModel->index(0, 0)))
                --bumpedItems;
            return m_treeModel->index(proxyIndex.row() - bumpedItems, proxyIndex.column());
        }

        QModelIndex historyIndex = m_treeModel->sourceModel()->index(proxyIndex.internalId(), proxyIndex.column());
        QModelIndex treeIndex = m_treeModel->mapFromSource(historyIndex);
        return treeIndex;
    }

    QModelIndex HistoryMenuModel::index(int row, int column, const QModelIndex &parent) const
    {
        if (row < 0
            || column < 0 || column >= columnCount(parent)
            || parent.column() > 0)
            return QModelIndex();
        if (!parent.isValid())
            return createIndex(row, column, quintptr(-1));

        QModelIndex treeIndexParent = mapToSource(parent);

        int bumpedItems = 0;
        if (treeIndexParent == m_treeModel->index(0, 0))
            bumpedItems = bumpedRows();
        QModelIndex treeIndex = m_treeModel->index(row + bumpedItems, column, treeIndexParent);
        QModelIndex historyIndex = m_treeModel->mapToSource(treeIndex);
        int historyRow = historyIndex.row();
        if (historyRow == -1)
            historyRow = treeIndex.row();
        return createIndex(row, column, historyRow);
    }

    QModelIndex HistoryMenuModel::parent(const QModelIndex &index) const
    {
        int offset = index.internalId();
        if (offset == -1 || !index.isValid())
            return QModelIndex();

        QModelIndex historyIndex = m_treeModel->sourceModel()->index(index.internalId(), 0);
        QModelIndex treeIndex = m_treeModel->mapFromSource(historyIndex);
        QModelIndex treeIndexParent = treeIndex.parent();

        int sr = m_treeModel->mapToSource(treeIndexParent).row();
        int bumpedItems = bumpedRows();
        if (bumpedItems <= MOVEDROWS && bumpedItems == sourceModel()->rowCount(sourceModel()->index(0, 0)))
            --bumpedItems;
        return createIndex(bumpedItems + treeIndexParent.row(), treeIndexParent.column(), sr);
    }

    HistoryMenu::HistoryMenu(QWidget *parent)
        : ModelMenu(parent)
        , m_history(0)
    {
        connect(this, SIGNAL(activated(QModelIndex)),
                this, SLOT(activated(QModelIndex)));
        setHoverRole(HistoryModel::UrlStringRole);
    }

    void HistoryMenu::activated(const QModelIndex &index)
    {
        emit openUrl(index.data(HistoryModel::UrlRole).toUrl());
    }

    bool HistoryMenu::prePopulated()
    {
        if (!m_history) {
            m_history = BrowserApplication::historyManager();
            m_historyMenuModel = new HistoryMenuModel(m_history->historyTreeModel(), this);
            setModel(m_historyMenuModel);
        }
        // initial actions
        for (int i = 0; i < m_initialActions.count(); ++i)
            addAction(m_initialActions.at(i));
        if (!m_initialActions.isEmpty())
            addSeparator();
        setFirstSeparator(m_historyMenuModel->bumpedRows());

        return false;
    }

    void HistoryMenu::postPopulated()
    {
        if (m_history->history().count() > 0)
            addSeparator();

        QAction *showAllAction = new QAction(tr("Show All History"), this);
        connect(showAllAction, SIGNAL(triggered()), this, SLOT(showHistoryDialog()));
        addAction(showAllAction);

        QAction *clearAction = new QAction(tr("Clear History"), this);
        connect(clearAction, SIGNAL(triggered()), m_history, SLOT(clear()));
        addAction(clearAction);
    }

    void HistoryMenu::showHistoryDialog()
    {
        HistoryDialog *dialog = new HistoryDialog(this);
        connect(dialog, SIGNAL(openUrl(QUrl)),
                this, SIGNAL(openUrl(QUrl)));
        dialog->show();
    }

    void HistoryMenu::setInitialActions(QList<QAction*> actions)
    {
        m_initialActions = actions;
        for (int i = 0; i < m_initialActions.count(); ++i)
            addAction(m_initialActions.at(i));
    }

    TreeProxyModel::TreeProxyModel(QObject *parent) : QSortFilterProxyModel(parent)
    {
        setSortRole(HistoryModel::DateTimeRole);
        setFilterCaseSensitivity(Qt::CaseInsensitive);
    }

    bool TreeProxyModel::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
    {
        if (!source_parent.isValid())
            return true;
        return QSortFilterProxyModel::filterAcceptsRow(source_row, source_parent);
    }

    HistoryDialog::HistoryDialog(QWidget *parent, HistoryManager *setHistory) : QDialog(parent)
    {
        HistoryManager *history = setHistory;
        if (!history)
            history = BrowserApplication::historyManager();
        setupUi(this);
        tree->setUniformRowHeights(true);
        tree->setSelectionBehavior(QAbstractItemView::SelectRows);
        tree->setTextElideMode(Qt::ElideMiddle);
        QAbstractItemModel *model = history->historyTreeModel();
        TreeProxyModel *proxyModel = new TreeProxyModel(this);
        connect(search, SIGNAL(textChanged(QString)),
                proxyModel, SLOT(setFilterFixedString(QString)));
        connect(removeButton, SIGNAL(clicked()), tree, SLOT(removeOne()));
        connect(removeAllButton, SIGNAL(clicked()), history, SLOT(clear()));
        proxyModel->setSourceModel(model);
        tree->setModel(proxyModel);
        tree->setExpanded(proxyModel->index(0, 0), true);
        tree->setAlternatingRowColors(true);
        QFontMetrics fm(font());
        int header = fm.width(QLatin1Char('m')) * 40;
        tree->header()->resizeSection(0, header);
        tree->header()->setStretchLastSection(true);
        connect(tree, SIGNAL(activated(QModelIndex)),
                this, SLOT(open()));
        tree->setContextMenuPolicy(Qt::CustomContextMenu);
        connect(tree, SIGNAL(customContextMenuRequested(QPoint)),
                this, SLOT(customContextMenuRequested(QPoint)));
    }

    void HistoryDialog::customContextMenuRequested(const QPoint &pos)
    {
        QMenu menu;
        QModelIndex index = tree->indexAt(pos);
        index = index.sibling(index.row(), 0);
        if (index.isValid() && !tree->model()->hasChildren(index)) {
            menu.addAction(tr("Open"), this, SLOT(open()));
            menu.addSeparator();
            menu.addAction(tr("Copy"), this, SLOT(copy()));
        }
        menu.addAction(tr("Delete"), tree, SLOT(removeOne()));
        menu.exec(QCursor::pos());
    }

    void HistoryDialog::open()
    {
        QModelIndex index = tree->currentIndex();
        if (!index.parent().isValid())
            return;
        emit openUrl(index.data(HistoryModel::UrlRole).toUrl());
    }

    void HistoryDialog::copy()
    {
        QModelIndex index = tree->currentIndex();
        if (!index.parent().isValid())
            return;
        QString url = index.data(HistoryModel::UrlStringRole).toString();

        QClipboard *clipboard = QApplication::clipboard();
        clipboard->setText(url);
    }

    HistoryFilterModel::HistoryFilterModel(QAbstractItemModel *sourceModel, QObject *parent)
        : QAbstractProxyModel(parent),
        m_loaded(false)
    {
        setSourceModel(sourceModel);
    }

    int HistoryFilterModel::historyLocation(const QString &url) const
    {
        load();
        if (!m_historyHash.contains(url))
            return 0;
        return sourceModel()->rowCount() - m_historyHash.value(url);
    }

    QVariant HistoryFilterModel::data(const QModelIndex &index, int role) const
    {
        return QAbstractProxyModel::data(index, role);
    }

    void HistoryFilterModel::setSourceModel(QAbstractItemModel *newSourceModel)
    {
        if (sourceModel()) {
            disconnect(sourceModel(), SIGNAL(modelReset()), this, SLOT(sourceReset()));
            disconnect(sourceModel(), SIGNAL(dataChanged(QModelIndex,QModelIndex)),
                       this, SLOT(dataChanged(QModelIndex,QModelIndex)));
            disconnect(sourceModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
                    this, SLOT(sourceRowsInserted(QModelIndex,int,int)));
            disconnect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex,int,int)),
                    this, SLOT(sourceRowsRemoved(QModelIndex,int,int)));
        }

        QAbstractProxyModel::setSourceModel(newSourceModel);

        if (sourceModel()) {
            m_loaded = false;
            connect(sourceModel(), SIGNAL(modelReset()), this, SLOT(sourceReset()));
            connect(sourceModel(), SIGNAL(dataChanged(QModelIndex,QModelIndex)),
                       this, SLOT(sourceDataChanged(QModelIndex,QModelIndex)));
            connect(sourceModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
                    this, SLOT(sourceRowsInserted(QModelIndex,int,int)));
            connect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex,int,int)),
                    this, SLOT(sourceRowsRemoved(QModelIndex,int,int)));
        }
    }

    void HistoryFilterModel::sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
    {
        emit dataChanged(mapFromSource(topLeft), mapFromSource(bottomRight));
    }

    QVariant HistoryFilterModel::headerData(int section, Qt::Orientation orientation, int role) const
    {
        return sourceModel()->headerData(section, orientation, role);
    }

    void HistoryFilterModel::sourceReset()
    {
        m_loaded = false;
        beginResetModel();
        endResetModel();
    }

    int HistoryFilterModel::rowCount(const QModelIndex &parent) const
    {
        load();
        if (parent.isValid())
            return 0;
        return m_historyHash.count();
    }

    int HistoryFilterModel::columnCount(const QModelIndex &parent) const
    {
        return (parent.isValid()) ? 0 : 2;
    }

    QModelIndex HistoryFilterModel::mapToSource(const QModelIndex &proxyIndex) const
    {
        load();
        int sourceRow = sourceModel()->rowCount() - proxyIndex.internalId();
        return sourceModel()->index(sourceRow, proxyIndex.column());
    }

    QModelIndex HistoryFilterModel::mapFromSource(const QModelIndex &sourceIndex) const
    {
        load();
        QString url = sourceIndex.data(HistoryModel::UrlStringRole).toString();
        if (!m_historyHash.contains(url))
            return QModelIndex();

        // This can be done in a binary search, but we can't use qBinary find
        // because it can't take: qBinaryFind(m_sourceRow.end(), m_sourceRow.begin(), v);
        // so if this is a performance bottlneck then convert to binary search, until then
        // the cleaner/easier to read code wins the day.
        int realRow = -1;
        int sourceModelRow = sourceModel()->rowCount() - sourceIndex.row();

        for (int i = 0; i < m_sourceRow.count(); ++i) {
            if (m_sourceRow.at(i) == sourceModelRow) {
                realRow = i;
                break;
            }
        }
        if (realRow == -1)
            return QModelIndex();

        return createIndex(realRow, sourceIndex.column(), sourceModel()->rowCount() - sourceIndex.row());
    }

    QModelIndex HistoryFilterModel::index(int row, int column, const QModelIndex &parent) const
    {
        load();
        if (row < 0 || row >= rowCount(parent)
            || column < 0 || column >= columnCount(parent))
            return QModelIndex();

        return createIndex(row, column, m_sourceRow[row]);
    }

    QModelIndex HistoryFilterModel::parent(const QModelIndex &) const
    {
        return QModelIndex();
    }

    void HistoryFilterModel::load() const
    {
        if (m_loaded)
            return;
        m_sourceRow.clear();
        m_historyHash.clear();
        m_historyHash.reserve(sourceModel()->rowCount());
        for (int i = 0; i < sourceModel()->rowCount(); ++i) {
            QModelIndex idx = sourceModel()->index(i, 0);
            QString url = idx.data(HistoryModel::UrlStringRole).toString();
            if (!m_historyHash.contains(url)) {
                m_sourceRow.append(sourceModel()->rowCount() - i);
                m_historyHash[url] = sourceModel()->rowCount() - i;
            }
        }
        m_loaded = true;
    }

    void HistoryFilterModel::sourceRowsInserted(const QModelIndex &parent, int start, int end)
    {
        Q_ASSERT(start == end && start == 0);
        Q_UNUSED(end);
        if (!m_loaded)
            return;
        QModelIndex idx = sourceModel()->index(start, 0, parent);
        QString url = idx.data(HistoryModel::UrlStringRole).toString();
        if (m_historyHash.contains(url)) {
            int sourceRow = sourceModel()->rowCount() - m_historyHash[url];
            int realRow = mapFromSource(sourceModel()->index(sourceRow, 0)).row();
            beginRemoveRows(QModelIndex(), realRow, realRow);
            m_sourceRow.removeAt(realRow);
            m_historyHash.remove(url);
            endRemoveRows();
        }
        beginInsertRows(QModelIndex(), 0, 0);
        m_historyHash.insert(url, sourceModel()->rowCount() - start);
        m_sourceRow.insert(0, sourceModel()->rowCount());
        endInsertRows();
    }

    void HistoryFilterModel::sourceRowsRemoved(const QModelIndex &, int start, int end)
    {
        Q_UNUSED(start);
        Q_UNUSED(end);
        sourceReset();
    }

    /*
        Removing a continuous block of rows will remove filtered rows too as this is
        the users intention.
    */
    bool HistoryFilterModel::removeRows(int row, int count, const QModelIndex &parent)
    {
        if (row < 0 || count <= 0 || row + count > rowCount(parent) || parent.isValid())
            return false;
        int lastRow = row + count - 1;
        disconnect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex,int,int)),
                    this, SLOT(sourceRowsRemoved(QModelIndex,int,int)));
        beginRemoveRows(parent, row, lastRow);
        int oldCount = rowCount();
        int start = sourceModel()->rowCount() - m_sourceRow.value(row);
        int end = sourceModel()->rowCount() - m_sourceRow.value(lastRow);
        sourceModel()->removeRows(start, end - start + 1);
        endRemoveRows();
        connect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex,int,int)),
                    this, SLOT(sourceRowsRemoved(QModelIndex,int,int)));
        m_loaded = false;
        if (oldCount - count != rowCount()) {
            beginResetModel();
            endResetModel();
        }
        return true;
    }

    HistoryCompletionModel::HistoryCompletionModel(QObject *parent)
        : QAbstractProxyModel(parent)
    {
    }

    QVariant HistoryCompletionModel::data(const QModelIndex &index, int role) const
    {
        if (sourceModel()
            && (role == Qt::EditRole || role == Qt::DisplayRole)
            && index.isValid()) {
            QModelIndex idx = mapToSource(index);
            idx = idx.sibling(idx.row(), 1);
            QString urlString = idx.data(HistoryModel::UrlStringRole).toString();
            if (index.row() % 2) {
                QUrl url = urlString;
                QString s = url.toString(QUrl::RemoveScheme
                                         | QUrl::RemoveUserInfo
                                         | QUrl::StripTrailingSlash);
                return s.mid(2);  // strip // from the front
            }
            return urlString;
        }
        return QAbstractProxyModel::data(index, role);
    }

    int HistoryCompletionModel::rowCount(const QModelIndex &parent) const
    {
        return (parent.isValid() || !sourceModel()) ? 0 : sourceModel()->rowCount(parent) * 2;
    }

    int HistoryCompletionModel::columnCount(const QModelIndex &parent) const
    {
        return (parent.isValid()) ? 0 : 1;
    }

    QModelIndex HistoryCompletionModel::mapFromSource(const QModelIndex &sourceIndex) const
    {
        int row = sourceIndex.row() * 2;
        return index(row, sourceIndex.column());
    }

    QModelIndex HistoryCompletionModel::mapToSource(const QModelIndex &proxyIndex) const
    {
        if (!sourceModel())
            return QModelIndex();
        int row = proxyIndex.row() / 2;
        return sourceModel()->index(row, proxyIndex.column());
    }

    QModelIndex HistoryCompletionModel::index(int row, int column, const QModelIndex &parent) const
    {
        if (row < 0 || row >= rowCount(parent)
            || column < 0 || column >= columnCount(parent))
            return QModelIndex();
        return createIndex(row, column);
    }

    QModelIndex HistoryCompletionModel::parent(const QModelIndex &) const
    {
        return QModelIndex();
    }

    void HistoryCompletionModel::setSourceModel(QAbstractItemModel *newSourceModel)
    {
        if (sourceModel()) {
            disconnect(sourceModel(), SIGNAL(modelReset()), this, SLOT(sourceReset()));
            disconnect(sourceModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
                    this, SLOT(sourceReset()));
            disconnect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex,int,int)),
                    this, SLOT(sourceReset()));
        }

        QAbstractProxyModel::setSourceModel(newSourceModel);

        if (newSourceModel) {
            connect(newSourceModel, SIGNAL(modelReset()), this, SLOT(sourceReset()));
            connect(sourceModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
                    this, SLOT(sourceReset()));
            connect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex,int,int)),
                    this, SLOT(sourceReset()));
        }

        beginResetModel();
        endResetModel();
    }

    void HistoryCompletionModel::sourceReset()
    {
        beginResetModel();
        endResetModel();
    }

    HistoryTreeModel::HistoryTreeModel(QAbstractItemModel *sourceModel, QObject *parent)
        : QAbstractProxyModel(parent)
    {
        setSourceModel(sourceModel);
    }

    QVariant HistoryTreeModel::headerData(int section, Qt::Orientation orientation, int role) const
    {
        return sourceModel()->headerData(section, orientation, role);
    }

    QVariant HistoryTreeModel::data(const QModelIndex &index, int role) const
    {
        if ((role == Qt::EditRole || role == Qt::DisplayRole)) {
            int start = index.internalId();
            if (start == 0) {
                int offset = sourceDateRow(index.row());
                if (index.column() == 0) {
                    QModelIndex idx = sourceModel()->index(offset, 0);
                    QDate date = idx.data(HistoryModel::DateRole).toDate();
                    if (date == QDate::currentDate())
                        return tr("Earlier Today");
                    return date.toString(QLatin1String("dddd, MMMM d, yyyy"));
                }
                if (index.column() == 1) {
                    return tr("%1 items").arg(rowCount(index.sibling(index.row(), 0)));
                }
            }
        }
        if (role == Qt::DecorationRole && index.column() == 0 && !index.parent().isValid())
            return QIcon(QLatin1String(":history.png"));
        if (role == HistoryModel::DateRole && index.column() == 0 && index.internalId() == 0) {
            int offset = sourceDateRow(index.row());
            QModelIndex idx = sourceModel()->index(offset, 0);
            return idx.data(HistoryModel::DateRole);
        }

        return QAbstractProxyModel::data(index, role);
    }

    int HistoryTreeModel::columnCount(const QModelIndex &parent) const
    {
        return sourceModel()->columnCount(mapToSource(parent));
    }

    int HistoryTreeModel::rowCount(const QModelIndex &parent) const
    {
        if ( parent.internalId() != 0
            || parent.column() > 0
            || !sourceModel())
            return 0;

        // row count OF dates
        if (!parent.isValid()) {
            if (!m_sourceRowCache.isEmpty())
                return m_sourceRowCache.count();
            QDate currentDate;
            int rows = 0;
            int totalRows = sourceModel()->rowCount();

            for (int i = 0; i < totalRows; ++i) {
                QDate rowDate = sourceModel()->index(i, 0).data(HistoryModel::DateRole).toDate();
                if (rowDate != currentDate) {
                    m_sourceRowCache.append(i);
                    currentDate = rowDate;
                    ++rows;
                }
            }
            Q_ASSERT(m_sourceRowCache.count() == rows);
            return rows;
        }

        // row count FOR a date
        int start = sourceDateRow(parent.row());
        int end = sourceDateRow(parent.row() + 1);
        return (end - start);
    }

    // Translate the top level date row into the offset where that date starts
    int HistoryTreeModel::sourceDateRow(int row) const
    {
        if (row <= 0)
            return 0;

        if (m_sourceRowCache.isEmpty())
            rowCount(QModelIndex());

        if (row >= m_sourceRowCache.count()) {
            if (!sourceModel())
                return 0;
            return sourceModel()->rowCount();
        }
        return m_sourceRowCache.at(row);
    }

    QModelIndex HistoryTreeModel::mapToSource(const QModelIndex &proxyIndex) const
    {
        int offset = proxyIndex.internalId();
        if (offset == 0)
            return QModelIndex();
        int startDateRow = sourceDateRow(offset - 1);
        return sourceModel()->index(startDateRow + proxyIndex.row(), proxyIndex.column());
    }

    QModelIndex HistoryTreeModel::index(int row, int column, const QModelIndex &parent) const
    {
        if (row < 0
            || column < 0 || column >= columnCount(parent)
            || parent.column() > 0)
            return QModelIndex();

        if (!parent.isValid())
            return createIndex(row, column);
        return createIndex(row, column, parent.row() + 1);
    }

    QModelIndex HistoryTreeModel::parent(const QModelIndex &index) const
    {
        int offset = index.internalId();
        if (offset == 0 || !index.isValid())
            return QModelIndex();
        return createIndex(offset - 1, 0);
    }

    bool HistoryTreeModel::hasChildren(const QModelIndex &parent) const
    {
        QModelIndex grandparent = parent.parent();
        if (!grandparent.isValid())
            return true;
        return false;
    }

    Qt::ItemFlags HistoryTreeModel::flags(const QModelIndex &index) const
    {
        if (!index.isValid())
            return Qt::NoItemFlags;
        return Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsDragEnabled;
    }

    bool HistoryTreeModel::removeRows(int row, int count, const QModelIndex &parent)
    {
        if (row < 0 || count <= 0 || row + count > rowCount(parent))
            return false;

        if (parent.isValid()) {
            // removing pages
            int offset = sourceDateRow(parent.row());
            return sourceModel()->removeRows(offset + row, count);
        } else {
            // removing whole dates
            for (int i = row + count - 1; i >= row; --i) {
                QModelIndex dateParent = index(i, 0);
                int offset = sourceDateRow(dateParent.row());
                if (!sourceModel()->removeRows(offset, rowCount(dateParent)))
                    return false;
            }
        }
        return true;
    }

    void HistoryTreeModel::setSourceModel(QAbstractItemModel *newSourceModel)
    {
        if (sourceModel()) {
            disconnect(sourceModel(), SIGNAL(modelReset()), this, SLOT(sourceReset()));
            disconnect(sourceModel(), SIGNAL(layoutChanged()), this, SLOT(sourceReset()));
            disconnect(sourceModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
                    this, SLOT(sourceRowsInserted(QModelIndex,int,int)));
            disconnect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex,int,int)),
                    this, SLOT(sourceRowsRemoved(QModelIndex,int,int)));
        }

        QAbstractProxyModel::setSourceModel(newSourceModel);

        if (newSourceModel) {
            connect(sourceModel(), SIGNAL(modelReset()), this, SLOT(sourceReset()));
            connect(sourceModel(), SIGNAL(layoutChanged()), this, SLOT(sourceReset()));
            connect(sourceModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
                    this, SLOT(sourceRowsInserted(QModelIndex,int,int)));
            connect(sourceModel(), SIGNAL(rowsRemoved(QModelIndex,int,int)),
                    this, SLOT(sourceRowsRemoved(QModelIndex,int,int)));
        }

        beginResetModel();
        endResetModel();
    }

    void HistoryTreeModel::sourceReset()
    {
        beginResetModel();
        m_sourceRowCache.clear();
        endResetModel();
    }

    void HistoryTreeModel::sourceRowsInserted(const QModelIndex &parent, int start, int end)
    {
        Q_UNUSED(parent); // Avoid warnings when compiling release
        Q_ASSERT(!parent.isValid());
        if (start != 0 || start != end) {
            beginResetModel();
            m_sourceRowCache.clear();
            endResetModel();
            return;
        }

        m_sourceRowCache.clear();
        QModelIndex treeIndex = mapFromSource(sourceModel()->index(start, 0));
        QModelIndex treeParent = treeIndex.parent();
        if (rowCount(treeParent) == 1) {
            beginInsertRows(QModelIndex(), 0, 0);
            endInsertRows();
        } else {
            beginInsertRows(treeParent, treeIndex.row(), treeIndex.row());
            endInsertRows();
        }
    }

    QModelIndex HistoryTreeModel::mapFromSource(const QModelIndex &sourceIndex) const
    {
        if (!sourceIndex.isValid())
            return QModelIndex();

        if (m_sourceRowCache.isEmpty())
            rowCount(QModelIndex());

        QList<int>::iterator it;
        it = qLowerBound(m_sourceRowCache.begin(), m_sourceRowCache.end(), sourceIndex.row());
        if (*it != sourceIndex.row())
            --it;
        int dateRow = qMax(0, it - m_sourceRowCache.begin());
        int row = sourceIndex.row() - m_sourceRowCache.at(dateRow);
        return createIndex(row, sourceIndex.column(), dateRow + 1);
    }

    void HistoryTreeModel::sourceRowsRemoved(const QModelIndex &parent, int start, int end)
    {
        Q_UNUSED(parent); // Avoid warnings when compiling release
        Q_ASSERT(!parent.isValid());
        if (m_sourceRowCache.isEmpty())
            return;
        for (int i = end; i >= start;) {
            QList<int>::iterator it;
            it = qLowerBound(m_sourceRowCache.begin(), m_sourceRowCache.end(), i);
            // playing it safe
            if (it == m_sourceRowCache.end()) {
                beginResetModel();
                m_sourceRowCache.clear();
                endResetModel();
                return;
            }

            if (*it != i)
                --it;
            int row = qMax(0, it - m_sourceRowCache.begin());
            int offset = m_sourceRowCache[row];
            QModelIndex dateParent = index(row, 0);
            // If we can remove all the rows in the date do that and skip over them
            int rc = rowCount(dateParent);
            if (i - rc + 1 == offset && start <= i - rc + 1) {
                beginRemoveRows(QModelIndex(), row, row);
                m_sourceRowCache.removeAt(row);
                i -= rc + 1;
            } else {
                beginRemoveRows(dateParent, i - offset, i - offset);
                ++row;
                --i;
            }
            for (int j = row; j < m_sourceRowCache.count(); ++j)
                --m_sourceRowCache[j];
            endRemoveRows();
        }
    }