homescreenapp/hsutils/src/hswidgetpositioningonwidgetadd.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Mar 2010 09:27:44 +0200
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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 "hswidgetpositioningonwidgetadd.h"
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#include <math.h>
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#include <QLineF>
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const qreal offset = 40; //TODO: Implement this as configurable parameter
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/*!
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    \class HsWidgetPositioningOnWidgetAdd
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    \brief Defines widget positioning on widget add.
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    Widget positioning on widget add sets positions for
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    a set of home screen widgets added from application library.
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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 HsWidgetPositioningOnWidgetAdd::setInstance(
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    HsWidgetPositioningOnWidgetAdd *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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HsWidgetPositioningOnWidgetAdd *HsWidgetPositioningOnWidgetAdd::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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HsWidgetPositioningOnWidgetAdd *HsWidgetPositioningOnWidgetAdd::mInstance = 0;
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/*!
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    \class HsAnchorPointInBottomRight
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    \brief Diagonal widget positioning algorithm.
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    Sets widget's lower right corner to follow content area's diagonal.
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    Widgets are positioned to certain offset to each other.
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*/
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QList<QRectF> HsAnchorPointInBottomRight::convert(
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    const QRectF &contentArea,
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    const QList<QRectF> &widgets)
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{
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    QList<QRectF> toGeometries;
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    //Offset for widgets' bottom right position to each other
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    qreal k = contentArea.height()/contentArea.width(); //slope of the diagonal
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    qreal offset_x = offset/(sqrt(k + 1));
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    qreal offset_y = k*offset_x;
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    QPointF offsetPoint(offset_x, offset_y);
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    QLineF diagonal(contentArea.topLeft(), contentArea.bottomRight());
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    QLineF widgetRight(contentArea.center().x()+ widgets.at(0).width()/2,
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                       contentArea.top(),
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                       contentArea.center().x()+ widgets.at(0).width()/2,
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                       contentArea.bottom());
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    QPointF anchorPoint;
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    if(QLineF::BoundedIntersection != diagonal.intersect(widgetRight, &anchorPoint)) {
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        return widgets; //Return original since undefined error.
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                        //In this case widget's must be wider than the content area.
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    }
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    //First widget to the center of the content area
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    foreach (QRectF g, widgets) {
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        g.moveBottomRight(anchorPoint);
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        toGeometries << g;
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        anchorPoint -= offsetPoint;
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        if(!contentArea.contains(anchorPoint)) {
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            anchorPoint = contentArea.bottomRight();
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        }
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    }
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    return toGeometries;
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}
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/*!
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    \class HsAnchorPointInCenter
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    \brief Diagonal widget positioning algorithm.
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    Sets widget's center point to follow content area's diagonal.
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    Widgets are positioned to certain offset to each other.
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*/
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#ifdef COVERAGE_MEASUREMENT
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#pragma CTC SKIP
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#endif //COVERAGE_MEASUREMENT
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QList<QRectF> HsAnchorPointInCenter::convert(
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    const QRectF &contentArea,
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    const QList<QRectF> &widgets)
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{
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    QList<QRectF> toGeometries;
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    //Offset for widgets' centers position to each other
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    qreal k = contentArea.height()/contentArea.width(); //slope of the diagonal
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    qreal offset_x = offset/(sqrt(k + 1));
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    qreal offset_y = k*offset_x;
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    QPointF offsetPoint(offset_x, offset_y);
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    //First widget to the center of the content area
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    QPointF anchorPoint = contentArea.center();
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    foreach (QRectF g, widgets) {
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        g.moveCenter(anchorPoint);
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        toGeometries << g;
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        anchorPoint -= offsetPoint;
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        if(!contentArea.contains(anchorPoint)) {
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            anchorPoint = contentArea.bottomRight();
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        }
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    }
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    return toGeometries;
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}
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#ifdef COVERAGE_MEASUREMENT
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#pragma CTC ENDSKIP
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#endif //COVERAGE_MEASUREMENT
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