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/*
 * (C) Copyright 1996-2016 ECMWF.
 * 
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. 
 * In applying this licence, ECMWF does not waive the privileges and immunities 
 * granted to it by virtue of its status as an intergovernmental organisation nor
 * does it submit to any jurisdiction.
 */

/*!
    \file MgQLayerItem.h
    \brief Definition of MgQLayerItem.
    \author Graphics Section, ECMWF

    Started: February 2010
*/

#ifndef _MgQLayerItem_H
#define _MgQLayerItem_H

#include <Layer.h>
#include "MgQ.h"

using magics::Layer;
using magics::SceneLayer;
	
class QImage;
class QPainter;

class MgQHistoItem;
class MgQLayoutItem;
class MgQMagnifierLayoutItem;
class MgQRootItem;
class MgQScene;
class MgQStepItem;

class MgQLayerState
{
public:
	QString name_;
	QString id_;
	int     stackLevel_;
	float   alpha_;
	bool    visible_;
};

class MgQSceneLayerItem : public QGraphicsItem
{
public:
	enum {Type = MgQ::SceneLayerItemType}; 
	
	MgQSceneLayerItem(const SceneLayer &sc) : sceneLayer_(sc) {};
	~MgQSceneLayerItem() {};

	const SceneLayer& sceneLayer() {return sceneLayer_;};
	void addProjectorItem(MgQLayoutItem *n) {projectorItems_ << n;}
	QList<MgQLayoutItem*> projectorItems() {return projectorItems_;}
	MgQLayoutItem* findProjectorItem(QPointF);
	
	int type() const {return Type;}
	QRectF boundingRect() const {return QRectF();}
	void paint(QPainter *, const QStyleOptionGraphicsItem *,
                QWidget *) {};

protected:
	const SceneLayer& sceneLayer_;
	QList<MgQLayoutItem*> projectorItems_;
};



class MgQLayerItem : public QGraphicsItem
{
public:	
	enum {Type = MgQ::LayerItemType};
	enum InfoImageType {HistoImage};

	MgQLayerItem(Layer &,MgQLayoutItem *,int);
	~MgQLayerItem();

	QString name() const {return QString::fromStdString(layer_.name());}
	Layer& layer() {return layer_;};
	void  setLayerAlpha(float);
	void  setLayerVisibility(bool);	
	float layerAlpha() const; 
	bool  layerVisibility() const;
	void  updateLayer(const MgQLayerItem*);
	MgQRootItem* rootItem() {return rootItem_;}
	
	void setStep(int step,MgQStepItem* item) {steps_[step]=item;} 
	void setStepVisible(int,bool);
	bool stepCached(int);
	void clearStep(int);
	int stepNum() {return steps_.count();}
	bool magnifierDataEnabled() {return magnifierDataEnabled_;}
	void setMagnifierDataEnabled(bool b) {magnifierDataEnabled_=b;}

	MgQLayoutItem* parentLayoutItem() {return layout_;}

	MgQMagnifierLayoutItem *magnifierLayoutItem();

	int type() const {return Type;}
	QRectF boundingRect() const {return QRectF();}
	void paint(QPainter *, const QStyleOptionGraphicsItem *,
                QWidget *widget=0);

	void setStackLevel(int);
	int stackLevel();

	void saveLayerState(MgQLayerState*);
	MgQLayoutItem* topLayoutItem();

	void renderPreview();

	const QImage& preview() const {return previewImg_;}


	MgQHistoItem* histoItem(int);
	MgQHistoItem* resetHistoItem(int);
	void addHistoItem(MgQHistoItem *);
	QPixmap histoPixmap(int,QSize);


protected:
	enum RootItemOwner {MainScene,AlphaScene,PreviewScene};
	
	void checkAlphaDeviceSize(QRect);
  	void addContentsToScene(RootItemOwner);

	Layer& layer_;

	MgQRootItem* rootItem_;
	RootItemOwner rootItemOwner_;

	MgQLayoutItem* layout_;

	MgQScene *alphaScene_;
	static QImage *alphaDevice_;
	static QPainter* alphaPainter_;

	MgQScene *previewScene_;
	QImage *previewDevice_;
	QPainter* previewPainter_;
	QImage previewImg_;

	QGraphicsScene *histoScene_;
	QImage *histoDevice_;
	QPainter* histoPainter_;

	QList<MgQStepItem*> steps_;
	QList<MgQHistoItem*> histoItems_;


	MgQMagnifierLayoutItem *magnifierLayout_;

	bool magnifierDataEnabled_;
};



#endif