/*

* 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 "hswidgetpositioningonorientationchange.h"

/*!

    \class HsWidgetPositioningOnOrientationChange

    \ingroup group_hsutils

    \brief Defines widget positioning on orientation change.

    Widget positioning on orientation change sets positions for

    a set of home screen widgets from landscape to portrait

    orientation and vice versa.

*/

/*!

    Sets the positioning \a instance as the current one.

    Deletes the existing instance if present.

*/

void HsWidgetPositioningOnOrientationChange::setInstance(

    HsWidgetPositioningOnOrientationChange *instance)

{

    if (mInstance)

        delete mInstance;

    mInstance = instance;

}

/*!

    Returns the current positioning instance.

*/

HsWidgetPositioningOnOrientationChange *HsWidgetPositioningOnOrientationChange::instance()

{

    return mInstance;

}

/*!

    Stores the current positioning instance.

*/

HsWidgetPositioningOnOrientationChange *HsWidgetPositioningOnOrientationChange::mInstance = 0;

/*!

    \class HsSimpleWidgetPositioningOnOrientationChange

    \brief Bounds center points of input geometries to

           the given output rectangle.

*/

/*!

    \class HsAdvancedWidgetPositioningOnOrientationChange

    \brief More advanced widget positioning algorithm.

    Calculates new center points of

    \a fromGeometries when moving from \a fromRect to \a toRect.

    Screen is divided to two pieces:

    \verbatim

    ------

    | A  |

    |    |

    ------

    | B  |

    |    |

    ------

    \endverbatim

    and after conversion widgets from A are moved to A' and widgets from B to B':

    \verbatim

    |-----|-----|

    |A'   | B'  |

    |-----|-----|

    \endverbatim

    and vice versa.

*/

QList<QRectF> HsAdvancedWidgetPositioningOnOrientationChange::convert(

    const QRectF &fromRect,

    const QList<QRectF> &fromGeometries,

    const QRectF &toRect)

{

    QList<QRectF> toGeometries;

    // Portrait -> Landscape

    if (fromRect.width() < fromRect.height()) {

        foreach (QRectF g, fromGeometries) {

            QRectF tg(g.topLeft() - fromRect.topLeft(), g.size());

            qreal x = tg.center().x() / fromRect.width();

            qreal y = tg.center().y() / (fromRect.height() / 2);

            if (y < 1) {

                x *= toRect.width() / 2;

                y *= toRect.height();

            } else {

                x *= toRect.width() / 2;

                x += toRect.width() / 2;

                y -= 1;

                y *= toRect.height();

            }

            x = qBound(g.width() / 2, x, toRect.width() - g.width() / 2);

            y = qBound(g.height() / 2, y, toRect.height() - g.height() / 2);

            g.moveCenter(QPointF(x, y) + toRect.topLeft());

            toGeometries.append(g);

        }

    } else { // Landscape -> Portrait

        foreach (QRectF g, fromGeometries) {

            QRectF tg(g.topLeft() - fromRect.topLeft(), g.size());

            qreal x = tg.center().x() / (fromRect.width() / 2);

            qreal y = tg.center().y() / fromRect.height();

            if (x < 1) {

                x *= toRect.width();

                y *= toRect.height() / 2;

            } else {

                x -= 1;

                x += toRect.width();

                y *= toRect.height() / 2;

                y += toRect.height() / 2;

            }

            x = qBound(g.width() / 2, x, toRect.width() - g.width() / 2);

            y = qBound(g.height() / 2, y, toRect.height() - g.height() / 2);

            g.moveCenter(QPointF(x, y) + toRect.topLeft());

            toGeometries.append(g);

        }

    }

    return toGeometries;

}