/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

#include <QtGlobal>

#include "hswidgetpositioningonwidgetadd.h"

#include <math.h>

#include <QLineF>

const qreal offset = 40; //TODO: Implement this as configurable parameter

/*!

    \class HsWidgetPositioningOnWidgetAdd

    \brief Defines widget positioning on widget add.

    Widget positioning on widget add sets positions for

    a set of home screen widgets added from application library.

*/

/*!

    Sets the positioning \a instance as the current one.

    Deletes the existing instance if present.

*/

void HsWidgetPositioningOnWidgetAdd::setInstance(

    HsWidgetPositioningOnWidgetAdd *instance)

{

    if (mInstance)

        delete mInstance;

    mInstance = instance;

}

/*!

    Returns the current positioning instance.

*/

HsWidgetPositioningOnWidgetAdd *HsWidgetPositioningOnWidgetAdd::instance()

{

    return mInstance;

}

/*!

    Stores the current positioning instance.

*/

HsWidgetPositioningOnWidgetAdd *HsWidgetPositioningOnWidgetAdd::mInstance = 0;

/*!

    \class HsAnchorPointInBottomRight

    \brief Diagonal widget positioning algorithm.

    Sets widget's lower right corner to follow content area's diagonal.

    Widgets are positioned to certain offset to each other.

*/

QList<QRectF> HsAnchorPointInBottomRight::convert(

    const QRectF &contentArea,

    const QList<QRectF> &rects,

    const QPointF &startPoint)

{

    QList<QRectF> toGeometries;

    //Offset for widgets' bottom right position to each other

    qreal k = contentArea.height()/contentArea.width(); //slope of the diagonal

    qreal offset_x = offset/(sqrt(k + 1));

    qreal offset_y = k*offset_x;

    QPointF offsetPoint(offset_x, offset_y);

    QPointF anchorPoint;

    if(startPoint.isNull()){

        QLineF diagonal(contentArea.topLeft(), contentArea.bottomRight());

        QLineF widgetRightSide(contentArea.center().x()+ rects.at(0).width()/2,

                           contentArea.top(),

                           contentArea.center().x()+ rects.at(0).width()/2,

                           contentArea.bottom());

        // right side line intersection with diagonal will be bottom right position

        // for the first rect

        if(QLineF::BoundedIntersection != 

            diagonal.intersect(widgetRightSide, &anchorPoint)) {

            return rects; //Return original since undefined error.

                            //In this case widget's must be wider than the content area.

        }

    }else{

        anchorPoint = startPoint - offsetPoint;

    }

    QRectF widgetRect;

    for(int i=0;i<rects.count();++i) {

        widgetRect = rects.at(i);

        widgetRect.moveBottomRight(anchorPoint);

        //if widget rect doesn't fit, try to move it

        if(!contentArea.contains(widgetRect)) {

            /*! precondition is that

             widget's max height < content area height

             widget's max widht < content area width

            */

            widgetRect.moveBottomRight(contentArea.bottomRight());

            // anchorPoin is always previous bottom right

            anchorPoint = widgetRect.bottomRight();

        }

        toGeometries << widgetRect;

        anchorPoint -= offsetPoint;

    }

    return toGeometries;

}

/*!

    \class HsAnchorPointInCenter

    \brief Diagonal widget positioning algorithm.

    Sets widget's center point to follow content area's diagonal.

    Widgets are positioned to certain offset to each other.

*/

#ifdef COVERAGE_MEASUREMENT

#pragma CTC SKIP

#endif //COVERAGE_MEASUREMENT

QList<QRectF> HsAnchorPointInCenter::convert(

    const QRectF &contentArea,

    const QList<QRectF> &rects,

    const QPointF &startPoint )

{

    Q_UNUSED(startPoint)

    QList<QRectF> toGeometries;

    //Offset for widgets' centers position to each other

    qreal k = contentArea.height()/contentArea.width(); //slope of the diagonal

    qreal offset_x = offset/(sqrt(k + 1));

    qreal offset_y = k*offset_x;

    QPointF offsetPoint(offset_x, offset_y);

    //First widget to the center of the content area

    QPointF anchorPoint = contentArea.center();

    foreach (QRectF g, rects) {

        g.moveCenter(anchorPoint);

        toGeometries << g;

        anchorPoint -= offsetPoint;

        if(!contentArea.contains(anchorPoint)) {

            anchorPoint = contentArea.bottomRight();

        }

    }

    return toGeometries;

}

#ifdef COVERAGE_MEASUREMENT

#pragma CTC ENDSKIP

#endif //COVERAGE_MEASUREMENT