/*

    Copyright (C) 2007 Trolltech ASA

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License

    along with this library; see the file COPYING.LIB.  If not, write to

    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    Boston, MA 02110-1301, USA.

    This class provides all functionality needed for loading images, style sheets and html

    pages from the web. It has a memory cache for these objects.

*/

#ifndef QWEBPAGEHISTORY_H

#define QWEBPAGEHISTORY_H

#include <QUrl>

#include <QString>

#include <QIcon>

#include <QDateTime>

#include <QSharedData>

#include <qwebkitglobal.h>

#if QT_VERSION < 0x040300

template <class T> class QExplicitlySharedDataPointer

{

public:

    typedef T Type;

    inline T &operator*() { return *d; }

    inline const T &operator*() const { return *d; }

    inline T *operator->() { return d; }

    inline const T *operator->() const { return d; }

    inline operator T *() { return d; }

    inline operator const T *() const { return d; }

    inline T *data() { return d; }

    inline const T *data() const { return d; }

    inline const T *constData() const { return d; }

    //inline operator bool () const { return d != 0; }

    inline bool operator==(const QExplicitlySharedDataPointer<T> &other) const { return d == other.d; }

    inline bool operator!=(const QExplicitlySharedDataPointer<T> &other) const { return d != other.d; }

    inline bool operator==(const T *ptr) const { return d == ptr; }

    inline bool operator!=(const T *ptr) const { return d != ptr; }

    inline QExplicitlySharedDataPointer() { d = 0; }

    inline ~QExplicitlySharedDataPointer() { if (d && !d->ref.deref()) delete d; }

    explicit QExplicitlySharedDataPointer(T *data);

    inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }

    inline QExplicitlySharedDataPointer<T> & operator=(const QExplicitlySharedDataPointer<T> &o) {

        if (o.d != d) {

            T *x = o.d;

            if (x) x->ref.ref();

            x = qAtomicSetPtr(&d, x);

            if (x && !x->ref.deref())

                delete x;

        }

        return *this;

    }

    inline QExplicitlySharedDataPointer &operator=(T *o) {

        if (o != d) {

            T *x = o;

            if (x) x->ref.ref();

            x = qAtomicSetPtr(&d, x);

            if (x && !x->ref.deref())

                delete x;

        }

        return *this;

    }

    inline bool operator!() const { return !d; }

private:

    T *d;

};

template <class T>

Q_INLINE_TEMPLATE QExplicitlySharedDataPointer<T>::QExplicitlySharedDataPointer(T *adata) : d(adata)

{ if (d) d->ref.ref(); }

#endif

class QWebPage;

class QWebHistoryItemPrivate;

class QWEBKIT_EXPORT QWebHistoryItem

{

public:

    QWebHistoryItem(const QWebHistoryItem &other);

    QWebHistoryItem &operator=(const QWebHistoryItem &other);

    ~QWebHistoryItem();

    QList<QWebHistoryItem*> children() const;

    QUrl originalUrl() const;

    QUrl currentUrl() const;

    QString title() const;

    QDateTime lastVisited() const;

    QPixmap icon() const;

    QWebHistoryItem(QWebHistoryItemPrivate *priv);

private:

    friend class QWebPageHistory;

    friend class QWebPage;

    QExplicitlySharedDataPointer<QWebHistoryItemPrivate> d;

};

class QWebPageHistoryPrivate;

class QWEBKIT_EXPORT QWebPageHistory

{

public:

    QWebPageHistory(const QWebPageHistory &other);

    QWebPageHistory &operator=(const QWebPageHistory &other);

    ~QWebPageHistory();

    void clear();

    QList<QWebHistoryItem> items() const;

    QList<QWebHistoryItem> backItems(int maxItems) const;

    QList<QWebHistoryItem> forwardItems(int maxItems) const;

    bool canGoBack() const;

    bool canGoForward() const;

    void goBack();

    void goForward();

    void goToItem(QWebHistoryItem *item);

    QWebHistoryItem backItem() const;

    QWebHistoryItem currentItem() const;

    QWebHistoryItem forwardItem() const;

    QWebHistoryItem itemAtIndex(int i) const;

    QWebPageHistory(QWebPageHistoryPrivate *priv);

private:

    QExplicitlySharedDataPointer<QWebPageHistoryPrivate> d;

};

#endif