/***************************************************************************
 *   Copyright (C) 2013-2014 by Tomasz Bojczuk                             *
 *   tomaszbojczuk@gmail.com                                               *
 *                                                                         *
 *   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 TCROSSFADETEXTITEM_H
#define TCROSSFADETEXTITEM_H

#include <nootkacoreglobal.h>
#include <QObject>
#include <QColor>

#define CLIP_TIME (30) // every move per 30 ms

class QGraphicsSimpleTextItem;

/** 
* Crossfading animation of passing two texts of given QGraphicsSimpleTextItem.  
*/
class NOOTKACORE_EXPORT TcrossFadeTextAnim : public QObject
{
		Q_OBJECT
   
public:
	
	TcrossFadeTextAnim(QGraphicsSimpleTextItem* textItem, QObject *parent = 0);
	
	void setDuration(int duration) { m_duration = duration; m_maxStep = m_duration / CLIP_TIME; }
	
signals:
		void crossFadingFinished();
	
public slots:
	void startCrossFading(const QString &newText, const QColor &newColor = -1);
	
	
protected slots:
	void crossFadingSlot();
	
private:
			/** Sets alpha value of item brush color.  */
	void setItemAlpha(int alpha);
	
private:
	QGraphicsSimpleTextItem		*m_item;
	int												 m_maxStep, m_currStep, m_duration, m_alpha;
	QString										 m_newText;
	QColor										 m_newColor;
		
};

#endif // TCROSSFADETEXTITEM_H
