homescreenapp/hsutils/src/hswidgetpositioningonorientationchange.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 23 Jun 2010 18:03:36 +0300
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#include <QtGlobal>
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#include "hswidgetpositioningonorientationchange.h"
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/*!
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    \class HsWidgetPositioningOnOrientationChange
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    \ingroup group_hsutils
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    \brief Defines widget positioning on orientation change.
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    Widget positioning on orientation change sets positions for
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    a set of home screen widgets from landscape to portrait
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    orientation and vice versa.
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*/
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/*!
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    Sets the positioning \a instance as the current one.
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    Deletes the existing instance if present.
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*/
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void HsWidgetPositioningOnOrientationChange::setInstance(
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    HsWidgetPositioningOnOrientationChange *instance)
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{
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    if (mInstance)
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        delete mInstance;
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    mInstance = instance;
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}
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/*!
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    Returns the current positioning instance.
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*/
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HsWidgetPositioningOnOrientationChange *HsWidgetPositioningOnOrientationChange::instance()
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{
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    return mInstance;
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}
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/*!
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    Stores the current positioning instance.
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*/
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HsWidgetPositioningOnOrientationChange *HsWidgetPositioningOnOrientationChange::mInstance = 0;
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/*!
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    \class HsSimpleWidgetPositioningOnOrientationChange
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    \brief Bounds center points of input geometries to
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           the given output rectangle.
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*/
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/*!
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    \class HsAdvancedWidgetPositioningOnOrientationChange
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    \brief More advanced widget positioning algorithm.
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    Calculates new center points of
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    \a fromGeometries when moving from \a fromRect to \a toRect.
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    Screen is divided to two pieces:
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    \verbatim
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    ------
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    | A  |
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    |    |
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    ------
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    | B  |
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    |    |
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    ------
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    \endverbatim
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    and after conversion widgets from A are moved to A' and widgets from B to B':
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    \verbatim
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    |-----|-----|
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    |A'   | B'  |
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    |-----|-----|
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    \endverbatim
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    and vice versa.
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*/
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QList<QRectF> HsAdvancedWidgetPositioningOnOrientationChange::convert(
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    const QRectF &fromRect,
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    const QList<QRectF> &fromGeometries,
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    const QRectF &toRect)
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{
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    QList<QRectF> toGeometries;
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    // Portrait -> Landscape
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    if (fromRect.width() < fromRect.height()) {
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        foreach (QRectF g, fromGeometries) {
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            QRectF tg(g.topLeft() - fromRect.topLeft(), g.size());
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            qreal x = tg.center().x() / fromRect.width();
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            qreal y = tg.center().y() / (fromRect.height() / 2);
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            if (y < 1) {
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                x *= toRect.width() / 2;
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                y *= toRect.height();
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            } else {
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                x *= toRect.width() / 2;
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                x += toRect.width() / 2;
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                y -= 1;
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                y *= toRect.height();
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            }
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            x = qBound(g.width() / 2, x, toRect.width() - g.width() / 2);
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            y = qBound(g.height() / 2, y, toRect.height() - g.height() / 2);
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            g.moveCenter(QPointF(x, y) + toRect.topLeft());
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            toGeometries.append(g);
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        }
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    } else { // Landscape -> Portrait
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        foreach (QRectF g, fromGeometries) {
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            QRectF tg(g.topLeft() - fromRect.topLeft(), g.size());
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            qreal x = tg.center().x() / (fromRect.width() / 2);
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            qreal y = tg.center().y() / fromRect.height();
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            if (x < 1) {
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                x *= toRect.width();
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                y *= toRect.height() / 2;
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            } else {
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                x -= 1;
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                x += toRect.width();
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                y *= toRect.height() / 2;
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                y += toRect.height() / 2;
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            }
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            x = qBound(g.width() / 2, x, toRect.width() - g.width() / 2);
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            y = qBound(g.height() / 2, y, toRect.height() - g.height() / 2);
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            g.moveCenter(QPointF(x, y) + toRect.topLeft());
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            toGeometries.append(g);
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        }
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    }
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    return toGeometries;
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}