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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2015 Pelican Mapping
 * http://osgearth.org
 *
 * osgEarth is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
#ifndef OSGEARTHQT_ACTIONS_H
#define OSGEARTHQT_ACTIONS_H 1

#include <osgEarthQt/Common>
#include <list>

namespace osgEarth { namespace QtGui 
{
    class DataManager;

    /**
     * Base class for an Action, which is a (potentially reversible) operation
     * handled by the ActionManager.
     */
    class OSGEARTHQT_EXPORT Action : public osg::Referenced
    {
    public:
        virtual bool doAction( void* sender, DataManager* manager ) =0;

        void cancel() {
            _canceled = true; }

        bool isOK() const {
            return _message.empty(); }

        bool isCanceled() const {
            return _canceled; }

        bool isCheckpoint() const {
            return _checkpoint; }

        bool setError( const std::string& message ) {
            _message = message;
            return false; }

        virtual bool isReversible() const {
            return false; }

        ViewVector& getViews() {
            return _views; }

    protected:
        Action() 
            : _canceled(false), _checkpoint(true) { }

        Action(ViewVector& views) 
            : _views(views), _canceled(false), _checkpoint(true) { }

        virtual ~Action() { }

        ViewVector  _views;
        bool        _canceled;
        bool        _checkpoint;
        std::string _message;
    };

    /**
     * An action that can be undone.
     */
    class OSGEARTHQT_EXPORT ReversibleAction : public Action
    {
    public:
        virtual bool undoAction( void* sender, DataManager* app ) =0;

        bool isReversible() const {
            return true; }

    protected:
        ReversibleAction() : Action() { _checkpoint = true; }
        ReversibleAction(ViewVector& views) : Action(views) { _checkpoint = true; }

        virtual ~ReversibleAction() { }
    };

    /**
     * Callback that fires before or after the ActionManager runs an Action.
     */
    class OSGEARTHQT_EXPORT ActionCallback : public osg::Referenced
    {
    public:
        virtual void operator()( void* sender, Action* action ) { }

    protected:
        ActionCallback() { }
        virtual ~ActionCallback() { }
    };

    /**
     * Interface for an Action Manager, an object that can run Actions, fire callbacks,
     * and maintain an undo stack.
     */
    class OSGEARTHQT_EXPORT ActionManager
    {
    public:
        virtual void addBeforeActionCallback( ActionCallback* cb ) =0;
        virtual void addAfterActionCallback( ActionCallback* cb ) =0;

        virtual bool doAction( void* sender, Action* action, bool reversible =true ) =0;
        virtual bool undoAction() =0;
        virtual bool canUndo() const =0;
        virtual void clearUndoActions() =0;
        virtual ReversibleAction* getNextUndoAction() const =0;

        virtual ~ActionManager() { }
    };

} }

#endif // OSGEARTHQT_ACTIONS_H