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/*  This file is part of the KDE project
    Copyright (C) 2008 Matthias Kretz <kretz@kde.org>

    This program 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; either
    version 2 of the License, or (at your option) version 3.

    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 KFADEWIDGETEFFECT_H
#define KFADEWIDGETEFFECT_H

#include <kdeui_export.h>
#include <QtGui/QWidget>

class KFadeWidgetEffectPrivate;

/** \class KFadeWidgetEffect kfadewidgeteffect.h KFadeWidgetEffect
 * \brief Animates changes fading the new UI over the old look.
 *
 * This widget will put itself above the widget that will change and show a fading transition from
 * the old to the new UI. It will delete itself after the animation is finished.
 * Example:
 * \code
 * KFadeWidgetEffect *animation = new KFadeWidgetEffect(widgetThatWillChange);
 * // do changes on widgetThatWillChange
 * // ...
 * animation->start();
 * \endcode
 *
 * \note The widget that changes needs to have a parent widget. KFadeWidgetEffect does not work
 * for toplevel widgets (windows).
 *
 * \author Matthias Kretz <kretz@kde.org>
 * \since 4.1
 */
class KDEUI_EXPORT KFadeWidgetEffect : public QWidget
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(KFadeWidgetEffect)
    public:
        /**
         * Create the animation widget. Takes a snapshot of the \p destWidget to use as old image
         * that gets faded out.
         *
         * \param destWidget The widget that will change and should fade to the new look.
         */
        KFadeWidgetEffect(QWidget *destWidget);

        /**
         * Destructor.
         *
         * \warning KFadeWidgetEffect deletes itself after the animation is finished.
         */
        ~KFadeWidgetEffect();

        /**
         * Starts the animation.
         *
         * Call this function after all visual changes are done.
         *
         * \param duration The duration of the animation in milliseconds.
         */
        void start(int duration = 250);

    protected:
        /**
         * \internal
         */
        void paintEvent(QPaintEvent *);

        /**
         * \internal
         */
        KFadeWidgetEffectPrivate *const d_ptr;

    private:
        Q_PRIVATE_SLOT(d_func(), void finished())
};

#endif // KFADEWIDGETEFFECT_H