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/****************************************************************************

** This file is part of the taborca project hosted at

** sf.net/projects/taborca

** Copyright (C) 2013 Shawn Rutledge

** Contact: s@ecloud.org

**

** 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 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 General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program in a file called LICENSE; if not, write to the

** Free Software Foundation, Inc.,

** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

****************************************************************************/

#ifndef THUMBNAILSCENE_H

#define THUMBNAILSCENE_H



#include <QGraphicsScene>

#include <QGraphicsGridLayout>

#include "thumbnailitem.h"



/**

	\brief QGraphicsScene specialized for holding thumbnails for all of the

	pages in the open PDF.



	Used in the thumbnails dock widget.



	Implements drag-and-drop page reordering.

*/

class ThumbnailScene : public QGraphicsScene

{

	Q_OBJECT



public:

    ThumbnailScene();



	/**

		If pages have been reordered, returns the command line options

		for the pdftk cat command.  Otherwise, empty string.

	*/

	QString pdftkCatPageRanges();



	int currentPage() { return selectedIdx; }



public slots:

	void resize(int numItems);

	void add(int idx, QImage pm, QString label);

	void layout(int width = -1, int height = -1);

	void currentPage(int idx);



	/**

		Override QGraphicsScene::clear() to also delete local stuff.

	*/

	void clear();



signals:

	void statusMessage(QString msg, int timeout = 0);

	void statusClear();

	void currentPageThumbnail(QGraphicsItem* it);



protected:

	void dragEnterEvent ( QGraphicsSceneDragDropEvent * ev );

	void dragMoveEvent ( QGraphicsSceneDragDropEvent * ev );

	void dropEvent ( QGraphicsSceneDragDropEvent * ev );



	/**

		At what index would the insertion occur *after*

		if dropped at the given position?

		E.g. if it's between items 5 and 6, will return 5.

	 */

	QPoint insertionIdx(QPointF pos);



protected:

	int cols;

	int spacing;

	QVector<ThumbnailItem*> items;

	int selectedIdx;

	QPixmap defaultItemIcon;

	QGraphicsLineItem insertionPoint;

	int row;

	int col;

	int maxWidth;

	int maxHeight;

};



#endif // THUMBNAILSCENE_H