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**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
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** 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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#ifndef HELPPLUGIN_H
#define HELPPLUGIN_H

#include "helpwidget.h"

#include <coreplugin/helpmanager.h>
#include <coreplugin/icontext.h>
#include <extensionsystem/iplugin.h>

#include <QMap>
#include <QStringList>

QT_BEGIN_NAMESPACE
class QAction;
class QComboBox;
class QMenu;
class QToolButton;
class QUrl;
QT_END_NAMESPACE

namespace Core {
class IMode;
class MiniSplitter;
class SideBar;
class SideBarItem;
}   // Core

namespace Utils { class StyledBar; }

namespace Help {
namespace Internal {
class CentralWidget;
class DocSettingsPage;
class FilterSettingsPage;
class GeneralSettingsPage;
class HelpMode;
class HelpViewer;
class LocalHelpManager;
class OpenPagesManager;
class SearchWidget;
class SearchTaskHandler;

class HelpPlugin : public ExtensionSystem::IPlugin
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QtCreatorPlugin" FILE "Help.json")

public:
    HelpPlugin();
    virtual ~HelpPlugin();

    bool initialize(const QStringList &arguments, QString *errorMessage);
    void extensionsInitialized();
    ShutdownFlag aboutToShutdown();

    static HelpViewer *createHelpViewer(qreal zoom);

private slots:
    void unregisterOldQtCreatorDocumentation();

    void modeChanged(Core::IMode *mode, Core::IMode *old);

    void showContextHelp();
    void activateIndex();
    void activateContents();
    void activateSearch();
    void activateOpenPages();
    void activateBookmarks();

    void addBookmark();
    void updateFilterComboBox();
    void filterDocumentation(const QString &customFilter);

    void saveExternalWindowSettings();
    void switchToHelpMode(const QUrl &source);
    void slotHideRightPane();
    void setSideBarVisible(bool visible);

    void updateSideBarSource();
    void updateSideBarSource(const QUrl &newUrl);

    void fontChanged();

    void updateCloseButton();
    void setupHelpEngineIfNeeded();

    void highlightSearchTermsInContextHelp();
    void handleHelpRequest(const QUrl &url, Core::HelpManager::HelpViewerLocation location);

    void slotAboutToShowBackMenu();
    void slotAboutToShowNextMenu();
    void slotOpenSupportPage();
    void slotReportBug();

    void onSideBarVisibilityChanged();

private:
    void setupUi();
    void resetFilter();
    void activateHelpMode();
    Utils::StyledBar *createWidgetToolBar();
    Utils::StyledBar *createIconToolBar(bool external);
    bool canShowHelpSideBySide() const;
    HelpViewer *viewerForHelpViewerLocation(Core::HelpManager::HelpViewerLocation location);
    HelpViewer *viewerForContextHelp();
    HelpWidget *createHelpWidget(const Core::Context &context, HelpWidget::WidgetStyle style);
    void createRightPaneContextViewer();
    HelpViewer *externalHelpViewer();

    void doSetupIfNeeded();
    Core::HelpManager::HelpViewerLocation contextHelpOption() const;
    void setupNavigationMenus(QAction *back, QAction *next, QWidget *parent);

private:
    HelpMode *m_mode;
    CentralWidget *m_centralWidget;
    HelpWidget *m_rightPaneSideBarWidget;

    Core::SideBarItem *m_contentItem;
    Core::SideBarItem *m_indexItem;
    Core::SideBarItem *m_searchItem;
    Core::SideBarItem *m_bookmarkItem;
    Core::SideBarItem *m_openPagesItem;

    DocSettingsPage *m_docSettingsPage;
    FilterSettingsPage *m_filterSettingsPage;
    GeneralSettingsPage *m_generalSettingsPage;
    SearchTaskHandler *m_searchTaskHandler;

    QComboBox *m_filterComboBox;
    Core::SideBar *m_sideBar;

    bool m_firstModeChange;
    LocalHelpManager *m_helpManager;
    OpenPagesManager *m_openPagesManager;
    Core::MiniSplitter *m_splitter;

    QToolButton *m_closeButton;

    QString m_contextHelpHighlightId;

    QPointer<HelpWidget> m_externalWindow;
    QRect m_externalWindowState;

    QMenu *m_backMenu;
    QMenu *m_nextMenu;
    Utils::StyledBar *m_internalHelpBar;
    Utils::StyledBar *m_externalHelpBar;

    bool m_isSidebarVisible;
    QAction *m_toggleSideBarAction;
};

} // namespace Internal
} // namespace Help

#endif // HELPPLUGIN_H