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#ifndef QHELPCONTENTWIDGET_H
#define QHELPCONTENTWIDGET_H

#include <QtHelp/qhelp_global.h>

#include <QtCore/QQueue>
#include <QtCore/QString>
#include <QtWidgets/QTreeView>

QT_BEGIN_NAMESPACE


class QHelpEnginePrivate;
class QHelpDBReader;
class QHelpContentItemPrivate;
class QHelpContentModelPrivate;
class QHelpEngine;
class QHelpContentProvider;

class QHELP_EXPORT QHelpContentItem
{
public:
    ~QHelpContentItem();

    QHelpContentItem *child(int row) const;
    int childCount() const;
    QString title() const;
    QUrl url() const;
    int row() const;
    QHelpContentItem *parent() const;
    int childPosition(QHelpContentItem *child) const;

private:
    QHelpContentItem(const QString &name, const QString &link,
        QHelpDBReader *reader, QHelpContentItem *parent = 0);
    void appendChild(QHelpContentItem *child);

    QHelpContentItemPrivate *d;
    friend class QHelpContentProvider;
};

class QHELP_EXPORT QHelpContentModel : public QAbstractItemModel
{
    Q_OBJECT

public:
    ~QHelpContentModel();

    void createContents(const QString &customFilterName);
    QHelpContentItem *contentItemAt(const QModelIndex &index) const;

    QVariant data(const QModelIndex &index, int role) const;
    QModelIndex index(int row, int column,
        const QModelIndex &parent = QModelIndex()) const;
    QModelIndex parent(const QModelIndex &index) const;
    int rowCount(const QModelIndex &parent = QModelIndex()) const;
    int columnCount(const QModelIndex &parent = QModelIndex()) const;
    bool isCreatingContents() const;

Q_SIGNALS:
    void contentsCreationStarted();
    void contentsCreated();

private Q_SLOTS:
    void insertContents();
    void invalidateContents(bool onShutDown = false);

private:
    QHelpContentModel(QHelpEnginePrivate *helpEngine);
    QHelpContentModelPrivate *d;
    friend class QHelpEnginePrivate;
};

class QHELP_EXPORT QHelpContentWidget : public QTreeView
{
    Q_OBJECT

public:
    QModelIndex indexOf(const QUrl &link);

Q_SIGNALS:
    void linkActivated(const QUrl &link);

private Q_SLOTS:
    void showLink(const QModelIndex &index);

private:
    bool searchContentItem(QHelpContentModel *model,
        const QModelIndex &parent, const QString &path);
    QModelIndex m_syncIndex;

private:
    QHelpContentWidget();
    friend class QHelpEngine;
};

QT_END_NAMESPACE

#endif

