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** Alternatively, this file may be used under the terms of the GNU
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#ifndef QTEXTDOCUMENT_H
#define QTEXTDOCUMENT_H

#include <QtGui/qtguiglobal.h>
#include <QtCore/qobject.h>
#include <QtCore/qsize.h>
#include <QtCore/qrect.h>
#include <QtCore/qvariant.h>
#include <QtGui/qfont.h>
#include <QtCore/qurl.h>

QT_BEGIN_NAMESPACE


class QTextFormatCollection;
class QTextListFormat;
class QRect;
class QPainter;
class QPagedPaintDevice;
class QAbstractTextDocumentLayout;
class QPoint;
class QTextObject;
class QTextFormat;
class QTextFrame;
class QTextBlock;
class QTextCodec;
class QVariant;
class QRectF;
class QTextOption;
class QTextCursor;

template<typename T> class QVector;

namespace Qt
{
    Q_GUI_EXPORT bool mightBeRichText(const QString&);
    Q_GUI_EXPORT QString convertFromPlainText(const QString &plain, WhiteSpaceMode mode = WhiteSpacePre);

#ifndef QT_NO_TEXTCODEC
    Q_GUI_EXPORT QTextCodec *codecForHtml(const QByteArray &ba);
#endif
}

class Q_GUI_EXPORT QAbstractUndoItem
{
public:
    virtual ~QAbstractUndoItem() = 0;
    virtual void undo() = 0;
    virtual void redo() = 0;
};

inline QAbstractUndoItem::~QAbstractUndoItem()
{
}

class QTextDocumentPrivate;

class Q_GUI_EXPORT QTextDocument : public QObject
{
    Q_OBJECT

    Q_PROPERTY(bool undoRedoEnabled READ isUndoRedoEnabled WRITE setUndoRedoEnabled)
    Q_PROPERTY(bool modified READ isModified WRITE setModified DESIGNABLE false)
    Q_PROPERTY(QSizeF pageSize READ pageSize WRITE setPageSize)
    Q_PROPERTY(QFont defaultFont READ defaultFont WRITE setDefaultFont)
    Q_PROPERTY(bool useDesignMetrics READ useDesignMetrics WRITE setUseDesignMetrics)
    Q_PROPERTY(QSizeF size READ size)
    Q_PROPERTY(qreal textWidth READ textWidth WRITE setTextWidth)
    Q_PROPERTY(int blockCount READ blockCount)
    Q_PROPERTY(qreal indentWidth READ indentWidth WRITE setIndentWidth)
#ifndef QT_NO_CSSPARSER
    Q_PROPERTY(QString defaultStyleSheet READ defaultStyleSheet WRITE setDefaultStyleSheet)
#endif
    Q_PROPERTY(int maximumBlockCount READ maximumBlockCount WRITE setMaximumBlockCount)
    Q_PROPERTY(qreal documentMargin READ documentMargin WRITE setDocumentMargin)
    QDOC_PROPERTY(QTextOption defaultTextOption READ defaultTextOption WRITE setDefaultTextOption)
    Q_PROPERTY(QUrl baseUrl READ baseUrl WRITE setBaseUrl NOTIFY baseUrlChanged)

public:
    explicit QTextDocument(QObject *parent = Q_NULLPTR);
    explicit QTextDocument(const QString &text, QObject *parent = Q_NULLPTR);
    ~QTextDocument();

    QTextDocument *clone(QObject *parent = Q_NULLPTR) const;

    bool isEmpty() const;
    virtual void clear();

    void setUndoRedoEnabled(bool enable);
    bool isUndoRedoEnabled() const;

    bool isUndoAvailable() const;
    bool isRedoAvailable() const;

    int availableUndoSteps() const;
    int availableRedoSteps() const;

    int revision() const;

    void setDocumentLayout(QAbstractTextDocumentLayout *layout);
    QAbstractTextDocumentLayout *documentLayout() const;

    enum MetaInformation {
        DocumentTitle,
        DocumentUrl
    };
    void setMetaInformation(MetaInformation info, const QString &);
    QString metaInformation(MetaInformation info) const;

#ifndef QT_NO_TEXTHTMLPARSER
    QString toHtml(const QByteArray &encoding = QByteArray()) const;
    void setHtml(const QString &html);
#endif

    QString toPlainText() const;
    void setPlainText(const QString &text);

    QChar characterAt(int pos) const;

    enum FindFlag
    {
        FindBackward        = 0x00001,
        FindCaseSensitively = 0x00002,
        FindWholeWords      = 0x00004
    };
    Q_DECLARE_FLAGS(FindFlags, FindFlag)

    QTextCursor find(const QString &subString, int from = 0, FindFlags options = FindFlags()) const;
    QTextCursor find(const QString &subString, const QTextCursor &cursor, FindFlags options = FindFlags()) const;

#ifndef QT_NO_REGEXP
    QTextCursor find(const QRegExp &expr, int from = 0, FindFlags options = FindFlags()) const;
    QTextCursor find(const QRegExp &expr, const QTextCursor &cursor, FindFlags options = FindFlags()) const;
#endif

#ifndef QT_NO_REGULAREXPRESSION
    QTextCursor find(const QRegularExpression &expr, int from = 0, FindFlags options = FindFlags()) const;
    QTextCursor find(const QRegularExpression &expr, const QTextCursor &cursor, FindFlags options = FindFlags()) const;
#endif

    QTextFrame *frameAt(int pos) const;
    QTextFrame *rootFrame() const;

    QTextObject *object(int objectIndex) const;
    QTextObject *objectForFormat(const QTextFormat &) const;

    QTextBlock findBlock(int pos) const;
    QTextBlock findBlockByNumber(int blockNumber) const;
    QTextBlock findBlockByLineNumber(int blockNumber) const;
    QTextBlock begin() const;
    QTextBlock end() const;

    QTextBlock firstBlock() const;
    QTextBlock lastBlock() const;

    void setPageSize(const QSizeF &size);
    QSizeF pageSize() const;

    void setDefaultFont(const QFont &font);
    QFont defaultFont() const;

    int pageCount() const;

    bool isModified() const;

    void print(QPagedPaintDevice *printer) const;

    enum ResourceType {
        HtmlResource  = 1,
        ImageResource = 2,
        StyleSheetResource = 3,

        UserResource  = 100
    };

    QVariant resource(int type, const QUrl &name) const;
    void addResource(int type, const QUrl &name, const QVariant &resource);

    QVector<QTextFormat> allFormats() const;

    void markContentsDirty(int from, int length);

    void setUseDesignMetrics(bool b);
    bool useDesignMetrics() const;

    void drawContents(QPainter *painter, const QRectF &rect = QRectF());

    void setTextWidth(qreal width);
    qreal textWidth() const;

    qreal idealWidth() const;

    qreal indentWidth() const;
    void setIndentWidth(qreal width);

    qreal documentMargin() const;
    void setDocumentMargin(qreal margin);

    void adjustSize();
    QSizeF size() const;

    int blockCount() const;
    int lineCount() const;
    int characterCount() const;

#ifndef QT_NO_CSSPARSER
    void setDefaultStyleSheet(const QString &sheet);
    QString defaultStyleSheet() const;
#endif

    void undo(QTextCursor *cursor);
    void redo(QTextCursor *cursor);

    enum Stacks {
        UndoStack = 0x01,
        RedoStack = 0x02,
        UndoAndRedoStacks = UndoStack | RedoStack
    };
    void clearUndoRedoStacks(Stacks historyToClear = UndoAndRedoStacks);

    int maximumBlockCount() const;
    void setMaximumBlockCount(int maximum);

    QTextOption defaultTextOption() const;
    void setDefaultTextOption(const QTextOption &option);

    QUrl baseUrl() const;
    void setBaseUrl(const QUrl &url);

    Qt::CursorMoveStyle defaultCursorMoveStyle() const;
    void setDefaultCursorMoveStyle(Qt::CursorMoveStyle style);

Q_SIGNALS:
    void contentsChange(int from, int charsRemoved, int charsAdded);
    void contentsChanged();
    void undoAvailable(bool);
    void redoAvailable(bool);
    void undoCommandAdded();
    void modificationChanged(bool m);
    void cursorPositionChanged(const QTextCursor &cursor);
    void blockCountChanged(int newBlockCount);
    void baseUrlChanged(const QUrl &url);
    void documentLayoutChanged();

public Q_SLOTS:
    void undo();
    void redo();
    void appendUndoItem(QAbstractUndoItem *);
    void setModified(bool m = true);

protected:
    virtual QTextObject *createObject(const QTextFormat &f);
    Q_INVOKABLE virtual QVariant loadResource(int type, const QUrl &name);

    QTextDocument(QTextDocumentPrivate &dd, QObject *parent);
public:
    QTextDocumentPrivate *docHandle() const;
private:
    Q_DISABLE_COPY(QTextDocument)
    Q_DECLARE_PRIVATE(QTextDocument)
    friend class QTextObjectPrivate;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QTextDocument::FindFlags)

QT_END_NAMESPACE

#endif // QTEXTDOCUMENT_H