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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Assistant module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef OPENPAGESMANAGER_H
#define OPENPAGESMANAGER_H

#include <QtCore/QObject>

QT_BEGIN_NAMESPACE

class QAbstractItemView;
class QModelIndex;
class QUrl;

class HelpViewer;
class OpenPagesModel;
class OpenPagesSwitcher;
class OpenPagesWidget;

class OpenPagesManager : public QObject
{
    Q_OBJECT
public:
    static OpenPagesManager *createInstance(QObject *parent,
        bool defaultCollection, const QUrl &cmdLineUrl);
    static OpenPagesManager *instance();

    bool pagesOpenForNamespace(const QString &nameSpace) const;
    void closePages(const QString &nameSpace);
    void reloadPages(const QString &nameSpace);

    QAbstractItemView* openPagesWidget() const;

    int pageCount() const;
    void setCurrentPage(int index);

public slots:
    HelpViewer *createPage(const QUrl &url, bool fromSearch = false);
    HelpViewer *createNewPageFromSearch(const QUrl &url);
    HelpViewer *createPage();
    void closeCurrentPage();

    void nextPage();
    void nextPageWithSwitcher();
    void previousPage();
    void previousPageWithSwitcher();

    void closePage(HelpViewer *page);
    void setCurrentPage(HelpViewer *page);

signals:
    void aboutToAddPage();
    void pageAdded(int index);

    void pageClosed();
    void aboutToClosePage(int index);

private slots:
    void setCurrentPage(const QModelIndex &index);
    void closePage(const QModelIndex &index);
    void closePagesExcept(const QModelIndex &index);

private:
    OpenPagesManager(QObject *parent, bool defaultCollection,
        const QUrl &cmdLineUrl);
    ~OpenPagesManager();

    void setupInitialPages(bool defaultCollection, const QUrl &cmdLineUrl);
    void closeOrReloadPages(const QString &nameSpace, bool tryReload);
    void removePage(int index);

    void nextOrPreviousPage(int offset);
    void showSwitcherOrSelectPage() const;

    OpenPagesModel *m_model;
    OpenPagesWidget *m_openPagesWidget;
    OpenPagesSwitcher *m_openPagesSwitcher;

    static OpenPagesManager *m_instance;
};

QT_END_NAMESPACE

#endif // OPENPAGESMANAGER_H