/*
    Scan Tailor - Interactive post-processing tool for scanned pages.
    Copyright (C) 2007-2009  Joseph Artsimovich <joseph_a@mail.ru>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef ZOOM_HANDLER_H_
#define ZOOM_HANDLER_H_

#include "InteractionHandler.h"
#include "InteractionState.h"
#include <QPoint>
#include <QCoreApplication>
#ifndef Q_MOC_RUN
#include <boost/function.hpp>
#endif

class ImageViewBase;

class ZoomHandler : public InteractionHandler
{
    Q_DECLARE_TR_FUNCTIONS(ZoomHandler)
public:
    enum Focus { CENTER, CURSOR };

    ZoomHandler(ImageViewBase& image_view);

    ZoomHandler(ImageViewBase& image_view,
                boost::function<bool(InteractionState const&)> const& explicit_interaction_permitter);

    Focus focus() const
    {
        return m_focus;
    }

    void setFocus(Focus focus)
    {
        m_focus = focus;
    }
protected:
    virtual void onWheelEvent(QWheelEvent* event, InteractionState& interaction);
    virtual void onKeyPressEvent(QKeyEvent* event, InteractionState& interaction);
private:
    ImageViewBase& m_rImageView;
    boost::function<bool(InteractionState const&)> m_interactionPermitter;
    InteractionState::Captor m_interaction;
    Focus m_focus;
};

#endif
