/*  View.h
 *
 *  Copyright (C) 2013  Jim Evins <evins@snaught.com>
 *
 *  This file is part of gLabels-qt.
 *
 *  gLabels-qt 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.
 *
 *  gLabels-qt 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 gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef glabels_View_h
#define glabels_View_h

#include <QGraphicsView>

#include "LabelRegion.h"

class QGraphicsScene;
class QGraphicsItemGroup;


namespace glabels
{
	// Forward References
	class LabelModel;
	class LabelModelObject;


	///
	/// View Widget
	///
	class View : public QGraphicsView
	{
		Q_OBJECT

		/////////////////////////////////////
		// Lifecycle
		/////////////////////////////////////
	public:
		View( QWidget *parent = 0 );


		/////////////////////////////////////
		// Signals
		/////////////////////////////////////
	signals:
		void zoomChanged();
		void pointerMoved( double x, double y );
		void pointerExited();


		/////////////////////////////////////
		// Parameters
		/////////////////////////////////////
	public:
		inline double zoom() const;


		/////////////////////////////////////
		// Model
		/////////////////////////////////////
	public:
		void setModel( LabelModel* model );


		/////////////////////////////////////
		// Visibility operations
		/////////////////////////////////////
	public:
		void setGridVisible( bool visibleFlag );
		void setMarkupVisible( bool visibleFlag );


		/////////////////////////////////////
		// Zoom operations
		/////////////////////////////////////
	public:
		void zoomIn();
		void zoomOut();
		void zoom1To1();
		void zoomToFit();
		bool isZoomMax() const;
		bool isZoomMin() const;
	private:
		void setZoomReal( double zoom, bool zoomToFitFlag );


		/////////////////////////////////////
		// Event handlers
		/////////////////////////////////////
	protected:
		void resizeEvent( QResizeEvent* event );
		void mouseMoveEvent( QMouseEvent* event );
		void mousePressEvent( QMouseEvent* event );
		void mouseReleaseEvent( QMouseEvent* event );
		void leaveEvent( QEvent* event );


		/////////////////////////////////////
		// Private methods
		/////////////////////////////////////
	private:
		void clearLayer( QGraphicsItemGroup* layer );
		void initLabelLayer();
		void initGridLayer();
		void initMarkupLayer();
		void addObjectToObjectLayer( LabelModelObject* object );
		void initForegroundLayer();
		void initSelectRegionLayer();


		/////////////////////////////////////
		// Private data
		/////////////////////////////////////
	private:
		enum State {
			IdleState,
			ArrowSelectRegionState
		};

		State               mState;

		QGraphicsScene*     mScene;

		QGraphicsItemGroup* mLabelLayer;
		QGraphicsItemGroup* mGridLayer;
		QGraphicsItemGroup* mMarkupLayer;
		QGraphicsItemGroup* mObjectLayer;
		QGraphicsItemGroup* mForegroundLayer;
		QGraphicsItemGroup* mSelectRegionLayer;

		QGraphicsRectItem*  mSelectRegionItem;
		LabelRegion         mSelectRegion;

		double              mZoom;
		bool                mZoomToFitFlag;

		LabelModel*         mModel;

	};


	/////////////////////////////////
	// INLINE METHODS
	/////////////////////////////////

	inline double View::zoom() const
	{
		return mZoom;
	}

}



#endif // glabels_View_h