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/*  This file is part of the KDE libraries
    Copyright (C) 2006 Michaël Larouche <michael.larouche@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 as published by the Free Software Foundation; version 2
    of the License.

    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 KDECORE_KMESSAGE_H
#define KDECORE_KMESSAGE_H

#include <kdecore_export.h>

#include <QtCore/QString>

class KMessageHandler;
/**
 * @brief Display an informative message using a KMessageHandler.
 *
 * This class does not define how to display a message, it is just
 * a clean interface for developers to use. 
 * The job is done by the current KMessageHandler set in the class.
 *
 * If no KMessageHandler is currently registered in KMessage, 
 * the message will be outputed to stderr.
 *
 * Use KMessage::setMessageHandler() to use a KMessageHandler.
 * 
 * @code
 * KMessage::setMessageHandler( new KMessageBoxHandler(this) );
 * // some operation
 * 
 * KMessage::message( KMessage::Error, i18n("Could not load service. Use kbuildsycoca to fix the service database."), i18n("KService") );
 * @endcode
 *
 * Some KMessageHandler are already done such as KMessageBoxMessageHandler and KPassivePopupMessageHandler.
 * @author Michaël Larouche <michael.larouche@kdemail.net>
 */
namespace KMessage
{
    enum MessageType
    {
        /**
         * Error message.
         * Display critical information that affect the behavior of the application.
         */
        Error,
        /**
         * Information message. 
         * Display useful information to the user.
         */
        Information,
        /**
         * Warning message. 
         * Display a message that could affect the behavior of the application.
         */
        Warning,
        /**
         * Sorry message.
         * Display a message explaining that a task couldn't be accomplished.
         */
        Sorry,
        /**
         * Fatal message.
         * Display a message before the application fail and close itself.
         */
        Fatal
    };

    /**
     * @brief Display a long message of a certain type.
     * A long message span on multiple lines and can have a caption.
     *
     * @param messageType Currrent type of message. See MessageType enum.
     * @param text Long message to be displayed.
     * @param caption Caption to be used. This is optional.
     */ 
    KDECORE_EXPORT void message(KMessage::MessageType messageType, const QString &text, const QString &caption = QString());

    /**
     * @brief Set the current KMessageHandler
     * Note that this method takes ownership of the KMessageHandler.
     * @param handler Instance of a real KMessageHandler.
     *
     * @warning This function isn't thread-safe. You don't want to
     *          change the message handler during the program's
     *          execution anyways. Do so <b>only</b> at start-up.
     */
    KDECORE_EXPORT void setMessageHandler(KMessageHandler *handler);
}

/**
 * \class KMessageHandler kmessage.h <KMessageHandler>
 * 
 * @brief Abstract class for KMessage handler.
 * This class define how KMessage display a message.
 *
 * Reimplement the virtual methods then set your custom
 * KMessageHandler using KMessage::setMessageHandler()
 *
 * @author Michaël Larouche <michael.larouche@kdemail.net>
 */
class KDECORE_EXPORT KMessageHandler
{
public:
    virtual ~KMessageHandler() {}
    /**
     * @brief Display a long message of a certain type.
     * A long message span on multiple lines and can have a caption.
     *
     * @param type Currrent type of message. See MessageType enum.
     * @param text Long message to be displayed.
     * @param caption Caption to be used. This is optional.
     */ 
    virtual void message(KMessage::MessageType type, const QString &text, const QString &caption) = 0;
};

#endif
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