/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the demonstration applications of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef HISTORY_H+
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#define HISTORY_H+
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+
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#include "modelmenu.h"+
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+
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#include <QtCore/QDateTime>+
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#include <QtCore/QHash>+
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#include <QtCore/QObject>+
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#include <QtCore/QTimer>+
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#include <QtCore/QUrl>+
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+
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#include <QtGui/QSortFilterProxyModel>+
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+
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#include <QWebHistoryInterface>+
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+
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class HistoryItem+
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{+
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public:+
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    HistoryItem() {}+
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    HistoryItem(const QString &u,+
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                const QDateTime &d = QDateTime(), const QString &t = QString())+
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        : title(t), url(u), dateTime(d) {}+
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+
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    inline bool operator==(const HistoryItem &other) const+
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        { return other.title == title+
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          && other.url == url && other.dateTime == dateTime; }+
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+
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    // history is sorted in reverse+
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    inline bool operator <(const HistoryItem &other) const+
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        { return dateTime > other.dateTime; }+
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+
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    QString title;+
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    QString url;+
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    QDateTime dateTime;+
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};+
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+
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class AutoSaver;+
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class HistoryModel;+
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class HistoryFilterModel;+
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class HistoryTreeModel;+
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class HistoryManager : public QWebHistoryInterface+
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{+
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    Q_OBJECT+
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    Q_PROPERTY(int historyLimit READ historyLimit WRITE setHistoryLimit)+
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+
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signals:+
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    void historyReset();+
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    void entryAdded(const HistoryItem &item);+
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    void entryRemoved(const HistoryItem &item);+
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    void entryUpdated(int offset);+
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+
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public:+
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    HistoryManager(QObject *parent = 0);+
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    ~HistoryManager();+
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+
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    bool historyContains(const QString &url) const;+
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    void addHistoryEntry(const QString &url);+
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+
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    void updateHistoryItem(const QUrl &url, const QString &title);+
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+
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    int historyLimit() const;+
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    void setHistoryLimit(int limit);+
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+
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    QList<HistoryItem> history() const;+
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    void setHistory(const QList<HistoryItem> &history, bool loadedAndSorted = false);+
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+
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    // History manager keeps around these models for use by the completer and other classes+
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    HistoryModel *historyModel() const;+
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    HistoryFilterModel *historyFilterModel() const;+
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    HistoryTreeModel *historyTreeModel() const;+
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+
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public slots:+
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    void clear();+
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    void loadSettings();+
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+
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private slots:+
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    void save();+
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    void checkForExpired();+
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+
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protected:+
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    void addHistoryItem(const HistoryItem &item);+
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+
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private:+
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    void load();+
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+
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    AutoSaver *m_saveTimer;+
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    int m_historyLimit;+
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    QTimer m_expiredTimer;+
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    QList<HistoryItem> m_history;+
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    QString m_lastSavedUrl;+
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+
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    HistoryModel *m_historyModel;+
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    HistoryFilterModel *m_historyFilterModel;+
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    HistoryTreeModel *m_historyTreeModel;+
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};+
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+
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class HistoryModel : public QAbstractTableModel+
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{+
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    Q_OBJECT+
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+
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public slots:+
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    void historyReset();+
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    void entryAdded();+
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    void entryUpdated(int offset);+
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+
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public:+
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    enum Roles {+
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        DateRole = Qt::UserRole + 1,+
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        DateTimeRole = Qt::UserRole + 2,+
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        UrlRole = Qt::UserRole + 3,+
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        UrlStringRole = Qt::UserRole + 4+
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    };+
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+
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    HistoryModel(HistoryManager *history, QObject *parent = 0);+
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    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;+
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    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;+
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    int columnCount(const QModelIndex &parent = QModelIndex()) const;+
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    int rowCount(const QModelIndex &parent = QModelIndex()) const;+
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    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());+
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+
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private:+
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    HistoryManager *m_history;+
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};+
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+
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/*!+
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    Proxy model that will remove any duplicate entries.+
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    Both m_sourceRow and m_historyHash store their offsets not from+
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    the front of the list, but as offsets from the back.+
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  */+
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class HistoryFilterModel : public QAbstractProxyModel+
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{+
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    Q_OBJECT+
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+
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public:+
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    HistoryFilterModel(QAbstractItemModel *sourceModel, QObject *parent = 0);+
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+
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    inline bool historyContains(const QString &url) const+
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        { load(); return m_historyHash.contains(url); }+
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    int historyLocation(const QString &url) const;+
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+
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    QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;+
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    QModelIndex mapToSource(const QModelIndex &proxyIndex) const;+
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    void setSourceModel(QAbstractItemModel *sourceModel);+
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    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;+
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    int rowCount(const QModelIndex &parent = QModelIndex()) const;+
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    int columnCount(const QModelIndex &parent = QModelIndex()) const;+
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    QModelIndex index(int, int, const QModelIndex& = QModelIndex()) const;+
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    QModelIndex parent(const QModelIndex& index= QModelIndex()) const;+
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    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());+
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    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;+
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+
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private slots:+
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    void sourceReset();+
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    void sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);+
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    void sourceRowsInserted(const QModelIndex &parent, int start, int end);+
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    void sourceRowsRemoved(const QModelIndex &, int, int);+
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+
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private:+
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    void load() const;+
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+
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    mutable QList<int> m_sourceRow;+
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    mutable QHash<QString, int> m_historyHash;+
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    mutable bool m_loaded;+
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};+
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+
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/*+
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    The history menu+
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    - Removes the first twenty entries and puts them as children of the top level.+
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    - If there are less then twenty entries then the first folder is also removed.+
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+
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    The mapping is done by knowing that HistoryTreeModel is over a table+
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    We store that row offset in our index's private data.+
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*/+
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class HistoryMenuModel : public QAbstractProxyModel+
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{+
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    Q_OBJECT+
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+
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public:+
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    HistoryMenuModel(HistoryTreeModel *sourceModel, QObject *parent = 0);+
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    int columnCount(const QModelIndex &parent) const;+
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    int rowCount(const QModelIndex &parent = QModelIndex()) const;+
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    QModelIndex mapFromSource(const QModelIndex & sourceIndex) const;+
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    QModelIndex mapToSource(const QModelIndex & proxyIndex) const;+
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    QModelIndex index(int, int, const QModelIndex &parent = QModelIndex()) const;+
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    QModelIndex parent(const QModelIndex &index = QModelIndex()) const;+
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+
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    int bumpedRows() const;+
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+
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private:+
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    HistoryTreeModel *m_treeModel;+
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};+
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+
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// Menu that is dynamically populated from the history+
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class HistoryMenu : public ModelMenu+
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{+
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    Q_OBJECT+
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+
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signals:+
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    void openUrl(const QUrl &url);+
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+
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public:+
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     HistoryMenu(QWidget *parent = 0);+
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     void setInitialActions(QList<QAction*> actions);+
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+
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protected:+
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    bool prePopulated();+
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    void postPopulated();+
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+
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private slots:+
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    void activated(const QModelIndex &index);+
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    void showHistoryDialog();+
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+
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private:+
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    HistoryManager *m_history;+
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    HistoryMenuModel *m_historyMenuModel;+
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    QList<QAction*> m_initialActions;+
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};+
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+
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// proxy model for the history model that+
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// exposes each url http://www.foo.com and it url starting at the host www.foo.com+
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class HistoryCompletionModel : public QAbstractProxyModel+
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{+
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    Q_OBJECT+
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+
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public:+
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    HistoryCompletionModel(QObject *parent = 0);+
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    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;+
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    int rowCount(const QModelIndex &parent = QModelIndex()) const;+
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    int columnCount(const QModelIndex &parent = QModelIndex()) const;+
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    QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;+
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    QModelIndex mapToSource(const QModelIndex &proxyIndex) const;+
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    QModelIndex index(int, int, const QModelIndex& = QModelIndex()) const;+
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    QModelIndex parent(const QModelIndex& index= QModelIndex()) const;+
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    void setSourceModel(QAbstractItemModel *sourceModel);+
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+
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private slots:+
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    void sourceReset();+
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+
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};+
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+
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// proxy model for the history model that converts the list+
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// into a tree, one top level node per day.+
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// Used in the HistoryDialog.+
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class HistoryTreeModel : public QAbstractProxyModel+
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{+
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    Q_OBJECT+
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+
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public:+
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    HistoryTreeModel(QAbstractItemModel *sourceModel, QObject *parent = 0);+
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    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;+
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    int columnCount(const QModelIndex &parent) const;+
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    int rowCount(const QModelIndex &parent = QModelIndex()) const;+
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    QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;+
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    QModelIndex mapToSource(const QModelIndex &proxyIndex) const;+
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    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;+
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    QModelIndex parent(const QModelIndex &index= QModelIndex()) const;+
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    bool hasChildren(const QModelIndex &parent = QModelIndex()) const;+
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    Qt::ItemFlags flags(const QModelIndex &index) const;+
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    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());+
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    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;+
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+
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    void setSourceModel(QAbstractItemModel *sourceModel);+
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+
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private slots:+
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    void sourceReset();+
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    void sourceRowsInserted(const QModelIndex &parent, int start, int end);+
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    void sourceRowsRemoved(const QModelIndex &parent, int start, int end);+
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+
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private:+
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    int sourceDateRow(int row) const;+
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    mutable QList<int> m_sourceRowCache;+
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+
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};+
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+
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// A modified QSortFilterProxyModel that always accepts the root nodes in the tree+
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// so filtering is only done on the children.+
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// Used in the HistoryDialog+
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class TreeProxyModel : public QSortFilterProxyModel+
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{+
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    Q_OBJECT+
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+
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public:+
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    TreeProxyModel(QObject *parent = 0);+
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+
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protected:+
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    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const;+
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};+
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+
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#include "ui_history.h"+
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+
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class HistoryDialog : public QDialog, public Ui_HistoryDialog+
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{+
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    Q_OBJECT+
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+
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signals:+
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    void openUrl(const QUrl &url);+
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+
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public:+
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    HistoryDialog(QWidget *parent = 0, HistoryManager *history = 0);+
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+
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private slots:+
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    void customContextMenuRequested(const QPoint &pos);+
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    void open();+
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    void copy();+
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+
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};+
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+
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#endif // HISTORY_H+
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+
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