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

 * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     Nokia Corporation - initial implementation

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

#ifndef SWT_LISTDATAMODEL_H

#define SWT_LISTDATAMODEL_H

#include <QAbstractListModel>

#include <QItemDelegate>

#include <QTextLayout>

#include <QItemSelection>

#include <QList>

#include "jniutils.h"

class QListView;

namespace Java { namespace eSWT {

class ListItem 

 	{

public:

	ListItem( const QString& aText );

	virtual ~ListItem();

	const QString& text() const;

	virtual const QPixmap* image() const;

	void setText(const QString& string);

	Qt::CheckState checkState() const;

	void setCheckState( Qt::CheckState state );	

protected:

	Qt::CheckState state;

	QString txt;

 	};

class ListBoxItem : public ListItem

	{

public:

	ListBoxItem(const QString& aDetailText, const QPixmap** aDetailImages, const int aDetailImageCount,  

		const QString& aHeadingText, const QPixmap** aHeadingImages, const int aHeadingImageCount );

	~ListBoxItem();

	const QString& headingText() const;

	const QList<QPixmap>& detailImages() const ;

	const QList<QPixmap>& headingImages() const;

	int detailImageCount() const;

	int headingImageCount() const;

	void setContentsToNull();

private:

	QString headingTxt;

	QList<QPixmap> detailImgs;

	QList<QPixmap> headingImgs;

	};	

class ListModel : public QAbstractListModel

	{

public:

     ListModel( int type, int style, QListView *parent );

     ~ListModel();

    /** 

	 * from QAbstractListModel

	 */

	int rowCount(const QModelIndex& parent) const;

   	QVariant data(const QModelIndex& index, int role) const;

	Qt::ItemFlags flags ( const QModelIndex& index ) const;

 	/**

 	 * called by JNI, these calls are delegated to protected methods from QAbstractListModel

 	 */

 	void beginInsertRows( const QModelIndex& parent, int first, int last );

	void endInsertRows(); 

	void beginRemoveRows( const QModelIndex& parent, int first, int last );

	void endRemoveRows(); 

	void emitLayoutAboutToBeChanged();

	void emitLayoutChanged();

 	/**

 	 * called by JNI

 	 */

    static ListModel* createDataModel( int type, int style, QListView *parent );

	const QString& itemString( const int row ) const;

	jobjectArray itemStrings( JNIEnv* aJniEnv );

	int indexOf( const QString& string, const int start ) const;

	int insertPosition(const QString& string, const bool ascent = true );

	void setCheckState( const QItemSelection& selection, Qt::CheckState state );

	void remove( const int row );

	void appendItem( const QString& string );

	void appendItem( const QString& string, const QPixmap* pixmap );

	void insertItem( const int row, const QString& string );

	void insertItem( const int row, const QString& string, const QPixmap* pixmap );

	virtual void appendItem(const QString& aDetailText, const QPixmap** aDetailImages, const int aDetailImageCount,  

		const QString& aHeadingText, const QPixmap** aHeadingImages, const int aHeadingImageCount );

	virtual int itemHeight();

	virtual void clearList();

	virtual void setItemContentsToNull( const int row );

 	/**

 	 * called by other native classes

 	 */

	int style() const;

protected:

 	virtual ListItem* createItem( const QString& string );

 	virtual ListItem* createItem( const QString& string, const QPixmap* pixmap );

	virtual ListItem* createItem(const QString& aDetailText, const QPixmap** aDetailImages, const int aDetailImageCount,  

		const QString& aHeadingText, const QPixmap** aHeadingImages, const int aHeadingImageCount );

protected:

	const int listType;

	const int layoutStyle;

 	/**

 	 * data body

 	 */

	QList<ListItem*> list;

	};	

class ListBoxModel : public ListModel

	{

public:

	ListBoxModel( int type, int style, QListView *parent );

	~ListBoxModel();

 	/**

 	 * from ListModel

 	 */

	void clearList();

	void appendItem(const QString& aDetailText, const QPixmap** aDetailImages, const int aDetailImageCount,  

		const QString& aHeadingText, const QPixmap** aHeadingImages, const int aHeadingImageCount );

 	/**

 	 * Below 5 methods provide item data

  	 */

	const QString& headingText(const int row) const;

	int detailImageCount( const int row ) const;

	int headingImageCount( const int row ) const;	

	const QList<QPixmap>& detailImages(const int row ) const;

	const QList<QPixmap>& headingImages( const int row ) const;

 	/**

 	 * called by ListBoxDelegate to save cached layout data to ListModel

 	 * so that the ListBoxDelegate does not have to compute layout data from scratch

 	 * whenever drawing a list item.

 	 */

	void updateLayoutData( const int row, const int rowHeight, const QPoint detailTxtSize, 

		const QPoint headingTxtSize, const int detailImgWidth, const int headingImgWidth ) const;

 	/**

 	 * Below 10 methods provide cached layout data 

  	 */

	const int& detailImageWidth(const int index ) const;

	const int& headingImageWidth(const int index ) const;

	QPoint detailTextSize() const;

	QPoint headingTextSize() const;

	int detailImageCount() const;

	int headingImageCount() const;

	QPoint detailImageSize(const int row) const;

	QPoint headingImageSize(const int row) const;

	int rowWithMaxDetailTextSize() const;

	int rowWithMaxHeadingTextSize() const;

	void setItemContentsToNull( const int row );

protected:	

 	/**

 	 * from ListModel

  	 */

	ListItem* createItem(const QString& aDetailText, const QPixmap** aDetailImages, const int aDetailImageCount,  

		const QString& aHeadingText, const QPixmap** aHeadingImages, const int aHeadingImageCount );

private:

 	/**

 	 * layout data

  	 */

 	/**

 	 * holds the index which item has the largest detail text size

  	 */

	int detailTxtIndex;

 	/**

 	 * holds the index which item has the largest heading text size

  	 */

	int headingTxtIndex;

 	/**

 	 * holds the largest  detail text size

  	 */

	mutable QPoint detailTxtSize;

 	/**

 	 * holds the largest  heading text size

  	 */

	mutable QPoint headingTxtSize;

 	/**

 	 * holds the amount of columns for detail images

  	 */

	int detailImgCount;

 	/**

 	 * holds the amount of columns for heading images

  	 */

	int headingImgCount;

 	/**

 	 * holds maximum height of images 

  	 */

	int imgHeight;

 	/**

 	 * holds widths for every detail image columns 

  	 */

	int* detailImgWidths;

 	/**

 	 * holds widths for every heading image columns 

  	 */

	int* headingImgWidths;

 	/**

 	 * holds heights for every rows

  	 */

	mutable int* rowHeights;

 	/**

 	 * holds entire width for all of detail images.

  	 */

	mutable int detailImgWidth;

 	/**

 	 * holds entire width for all of heading images.

  	 */

	mutable int headingImgWidth;

	};

 class ListBoxItemDelegate : public QItemDelegate

	{

	Q_OBJECT

public:

	ListBoxItemDelegate( QObject* parent );

	// from QItemDelegate

	void paint(QPainter * painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const;	

    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;

    // called from JNI

	void setHeadingFont( QFont* font );

private:

 	/**

 	 * compute sizes of checkbox, detailtext, headingtext, detailImage and  headingImage.

  	 */

	void computeSizes( const QModelIndex& index, const QStyleOptionViewItem& option, QSize* checkSize, 

	QSize *headingImageSize, QSize* detailImageSize, QSize* headingTextSize, QSize* detailTextSize) const;

 	/**

 	 * add margins to checkbox, detailtext, headingtext, detailImage and  headingImage.

  	 */

	void addMargins( const QStyleOptionViewItem &option, QSize* checkSize, 

		QSize* headingImageSize, QSize* detailImageSize, QSize* headingTextSize, QSize* detailTextSize ) const;

	/**	

	 * compute item entire size	for the item

	 */

	QSize computeSize(  const QStyleOptionViewItem &option, const QSize& check, const QSize& headingImage, 

		const QSize& detailImage, const QSize& headingText, const QSize& detailText ) const;

	/**	

	 * layout checkbox, detailtext, headingtext, detailImage and headingImage within a given rectangle

	 * and adjust sizes and positions according to alignments from option	

	 */

	void layoutRects( const QStyleOptionViewItem &option, QRect* check, QRect *headingImage, 

		QRect* detailImage, QRect* headingText, QRect* detailText, bool hint ) const;

	/**	

	 * layout checkbox, detailtext, headingtext, detailImage and  headingImage within a given rectangle

	 */

	void doLayout( const QStyleOptionViewItem &option, QRect* checkRect, QRect* headingImageRect,

		QRect* detailImageRect, QRect* headingTextRect, QRect* detailTextRect ) const;

    	QStyleOptionViewItem setOptions(const QModelIndex &index, const QStyleOptionViewItem &option) const;

	QRect textRectangle(const int width, const QFont &font, const QString &text) const;

	int margin( const QStyleOptionViewItem &option ) const;

private:

    void drawImages( QPainter* painter, const QStyleOptionViewItem &option, 

            const QRect imageRect, const QList<QPixmap>& images, const int* imageWidths, const int imageCount ) const;

private:	

	/**	

	 * not own

	 */

	const ListBoxModel* dataModel;

    mutable QTextLayout textLayout;

    QFont* headingFont;

	};

 }}

#endif // SWT_LISTDATAMODEL_H