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Hi,

in light of the on-the-fly spell checking feature, I'd like to propose a spell 
checking interface for documents, which adds the possibility to set different 
languages for parts of a document and a function for obtaining document 
ranges that should be spell checked.

A first interface proposal is attached.

Michel

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/* This file is part of the KDE libraries
   Copyright (C) 2008 Michel Ludwig <michel.ludwig@kdemail.net>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#ifndef KDELIBS_KTEXTEDITOR_SPELLCHECKINTERFACE_H
#define KDELIBS_KTEXTEDITOR_SPELLCHECKINTERFACE_H

#include <ktexteditor/ktexteditor_export.h>

class KConfigGroup;

#include <QtCore/QObject>

namespace KTextEditor
{

/**
 * \brief Spell checking extension for the Document.
 *
 * \ingroup kte_group_document_extensions
 *
 * \section spellcheck_intro Introduction
 *
 * The SpellcheckInterface is an extension for Documents which allows access to spell checking
 * related functionalities.
 *
 * \section spellcheck_support Adding Spell Checking Support
 *
 * To add support for spell checking a KTextEditor implementation has to derive the
 * Document class from SpellcheckInterface and reimplement the purely virtual methods defined
 * in this interfaces.
 *
 * \section spellcheck_access Accessing the SpellcheckInterface
 *
 * The SpellcheckInterface is supposed to be an extension interface for a Document, i.e. the
 * Document inherits the interface \e provided that it implements the interface. Use qobject_cast to
 * access the implementation:
 * \code
 * // object is of type KTextEditor::Document*
 * KTextEditor::SpellcheckInterface *iface =
 *     qobject_cast<KTextEditor::SpellcheckInterface*>( object );
 *
 * if( iface ) {
 *     // interface is supported
 *     // do stuff
 * }
 * \endcode
 *
 * \since 4.1
 * \see KTextEditor::Document, Sonnet::Speller
 * \author Michel Ludwig \<michel.ludwig@kdemail.net\>
 */
class KTEXTEDITOR_EXPORT SpellcheckInterface
{
  public:
    /**
     * Constructor.
     */
    SpellcheckInterface();

    /**
     * Virtual destructor.
     */
    virtual ~SpellcheckInterface() {}

  public:
    /**
     * Return the sub-ranges that contain text that should be spell checked within a given
     * document range.
     *
     * \param range Document range
     * \return Sub-ranges of \p range which contain text that should be spell checked
     * \since 4.1
     */
    virtual QList<KTextEditor::Range> spellcheckableText(const KTextEditor::Range& range) const = 0;

    /**
     * Set the default language of the document, which is used when no other language is
     * set for a sub-range of the document.
     *
     * \param language Default language of the document
     * \since 4.1
     */
    virtual void setDefaultLanguage(const QString& language) = 0;

    /**
     * Get the default language of the document.
     *
     * \return Default language of the document
     * \since 4.1
     */
    virtual void defaultLanguage(const QString& language) const = 0;

    /**
     * Sets the language for a range in the document. Any existing language settings
     * for this range are overridden.
     *
     * \param range Range of the document for which the language is set
     * \param language New language for the given range 
     * \since 4.1
     */
    virtual void changeLanguage(const KTextEditor::Range& range, const QString& language) = 0;

    /**
     * Sets the languages for specific ranges in the document.
     *
     * \param list List of range-language pairs; the ranges must be non-overlapping
     * \since 4.1
     */
    virtual void setDocumentLanguages(const QList<QPair<KTextEditor::SmartRange*, QString> >& list) = 0;

    /**
     * Clears the languages set for different document ranges.
     * \since 4.1
     */
    virtual void clearDocumentLanguages() = 0;

    /**
     * Returns the range-language pairs for the current document.
     *
     * \return List of range-language pairs
     * \since 4.1
     */
    virtual QList<QPair<KTextEditor::SmartRange*, QString> > documentLanguages() const = 0;

    /**
     * Returns the Speller object which is used for the spell checking.
     *
     * \return Speller object that is used for spell checking
     * \since 4.1
     **/
    virtual Sonnet::Speller speller() const = 0;

    /**
     * Sets the Speller object that is used for spell checking.
     *
     * \param speller Speller object that should be used for spell checking
     * \since 4.1
     */
    virtual void setSpeller(const Sonnet::Speller& speller) = 0;

  private:
    class SpellcheckInterfacePrivate* const d;
};

}

Q_DECLARE_INTERFACE(KTextEditor::SpellcheckInterface, "org.kde.KTextEditor.SpellcheckInterface")

#endif

// kate: space-indent on; indent-width 2; replace-tabs on;

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