homescreenapp/hsutils/inc/hswidgetpositioningonwidgetadd.h
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/*
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* Copyright (c) 2010 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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#ifndef HSWIDGETPOSITIONINGONWIDGETADD_H
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#define HSWIDGETPOSITIONINGONWIDGETADD_H
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#include <QList>
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#include <QRectF>
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#include <QPointF>
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#include "hsutils_global.h"
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class HsWidgetHost;
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class HSUTILS_EXPORT HsWidgetPositioningOnWidgetAdd
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{
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public:
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    virtual ~HsWidgetPositioningOnWidgetAdd() {}
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    virtual QList<QRectF> convert(const QRectF &contentArea,
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                                  const QList<QRectF> &existingRects,
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                                  const QList<QRectF> &newRects,
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                                  const QPointF &startPoint) = 0;
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    static void setInstance(HsWidgetPositioningOnWidgetAdd *instance);
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    static HsWidgetPositioningOnWidgetAdd *instance();
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private:
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    static HsWidgetPositioningOnWidgetAdd *mInstance;
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};
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class HSUTILS_EXPORT HsAnchorPointInBottomRight : public HsWidgetPositioningOnWidgetAdd
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{
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public:
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    QList<QRectF> convert(const QRectF &contentArea,
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                          const QList<QRectF> &existingRects,
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                          const QList<QRectF> &newRects,
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                          const QPointF &startPoint);
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};
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class HSUTILS_EXPORT HsAnchorPointInCenter : public HsWidgetPositioningOnWidgetAdd
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{
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public:
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    QList<QRectF> convert(const QRectF &contentArea,
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                          const QList<QRectF> &existingRects,
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                          const QList<QRectF> &newRects,
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                          const QPointF &startPoint);
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 };
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class HSUTILS_EXPORT HsWidgetOrganizer : public HsWidgetPositioningOnWidgetAdd
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{
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public:
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    QList<QRectF> convert(const QRectF &contentArea,
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                          const QList<QRectF> &existingRects,
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                          const QList<QRectF> &newRects,
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                          const QPointF &startPoint);
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private:
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    bool initAnchors(const QSizeF &areaSize);
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    bool getAnchorPoint(const QSizeF &contentSize);
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    bool searchWidthSpace(const QSizeF &contentSize);
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    bool searchHeightSpace(int contentHeight);
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    bool markReservedAnchors();
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    QPointF getAnchorCoordinates(int index);
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    int getIndexForCoordinate(QPointF position);
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    int lenghtInAnchorPoints(QVariant length);
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private:
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    int mAnchorColumns;
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    int mAnchorRows;
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    int mAnchorDistance;
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    QPointF mStartWidthAnchorPoint;
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    QPointF mEndWidthAnchorPoint;
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    QPointF mEndHeightAnchorPoint;
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    // TODO: is there better way to store anchor points, perhaps with pointers?
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    QList<bool> mAnchors;
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};
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#endif // HSWIDGETPOSITIONINGONWIDGETADD_H