/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtGui module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** 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

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#ifndef QABSTRACTTEXTDOCUMENTLAYOUT_H

#define QABSTRACTTEXTDOCUMENTLAYOUT_H

#include <QtCore/qobject.h>

#include <QtGui/qtextlayout.h>

#include <QtGui/qtextdocument.h>

#include <QtGui/qtextcursor.h>

#include <QtGui/qpalette.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Gui)

class QAbstractTextDocumentLayoutPrivate;

class QTextBlock;

class QTextObjectInterface;

class QTextFrame;

class Q_GUI_EXPORT QAbstractTextDocumentLayout : public QObject

{

    Q_OBJECT

    Q_DECLARE_PRIVATE(QAbstractTextDocumentLayout)

public:

    explicit QAbstractTextDocumentLayout(QTextDocument *doc);

    ~QAbstractTextDocumentLayout();

    struct Selection

    {

        QTextCursor cursor;

        QTextCharFormat format;

    };

    struct PaintContext

    {

        PaintContext()

            : cursorPosition(-1)

            {}

        int cursorPosition;

        QPalette palette;

        QRectF clip;

        QVector<Selection> selections;

    };

    virtual void draw(QPainter *painter, const PaintContext &context) = 0;

    virtual int hitTest(const QPointF &point, Qt::HitTestAccuracy accuracy) const = 0;

    QString anchorAt(const QPointF& pos) const;

    virtual int pageCount() const = 0;

    virtual QSizeF documentSize() const = 0;

    virtual QRectF frameBoundingRect(QTextFrame *frame) const = 0;

    virtual QRectF blockBoundingRect(const QTextBlock &block) const = 0;

    void setPaintDevice(QPaintDevice *device);

    QPaintDevice *paintDevice() const;

    QTextDocument *document() const;

    void registerHandler(int objectType, QObject *component);

    QTextObjectInterface *handlerForObject(int objectType) const;

Q_SIGNALS:

    void update(const QRectF & = QRectF(0., 0., 1000000000., 1000000000.));

    void updateBlock(const QTextBlock &block);

    void documentSizeChanged(const QSizeF &newSize);

    void pageCountChanged(int newPages);

protected:

    QAbstractTextDocumentLayout(QAbstractTextDocumentLayoutPrivate &, QTextDocument *);

    virtual void documentChanged(int from, int charsRemoved, int charsAdded) = 0;

    virtual void resizeInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format);

    virtual void positionInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format);

    virtual void drawInlineObject(QPainter *painter, const QRectF &rect, QTextInlineObject object, int posInDocument, const QTextFormat &format);

    int formatIndex(int pos);

    QTextCharFormat format(int pos);

private:

    friend class QTextDocument;

    friend class QTextDocumentPrivate;

    friend class QTextEngine;

    friend class QTextLayout;

    friend class QTextLine;

    Q_PRIVATE_SLOT(d_func(), void _q_handlerDestroyed(QObject *obj))

    Q_PRIVATE_SLOT(d_func(), int _q_dynamicPageCountSlot())

    Q_PRIVATE_SLOT(d_func(), QSizeF _q_dynamicDocumentSizeSlot())

};

class Q_GUI_EXPORT QTextObjectInterface

{

public:

    virtual ~QTextObjectInterface() {}

    virtual QSizeF intrinsicSize(QTextDocument *doc, int posInDocument, const QTextFormat &format) = 0;

    virtual void drawObject(QPainter *painter, const QRectF &rect, QTextDocument *doc, int posInDocument, const QTextFormat &format) = 0;

};

Q_DECLARE_INTERFACE(QTextObjectInterface, "com.trolltech.Qt.QTextObjectInterface")

QT_END_NAMESPACE

QT_END_HEADER

#endif // QABSTRACTTEXTDOCUMENTLAYOUT_H